Grupo Aval Acciones y Valores (AVAL) 20-F 27 Apr 18 2017 FY Annual report (foreign) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2017shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	Grupo Aval Acciones Y Valores S.A.
Entity Central Index Key	1,504,764
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Trading Symbol	AVAL
Entity Common Stock, Shares Outstanding	15,240,124,702

Consolidated Statement of Finan

Consolidated Statement of Financial Position $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)
Assets
Cash and cash equivalents	$ 22,336,838	$ 7,485.5	[1]	$ 22,193,004
Held-for-trading:
Debt securities	2,650,536	888.2	[1]	2,343,902
Equity securities	2,149,160	720.2	[1]	1,747,614
Financial assets at fair value through profit or loss	4,799,696	1,608.4		4,091,516
Derivative instruments	328,392	110.1	[1]	502,209
Held-for-trading, total	5,128,088	1,718.5		4,593,725
Available-for-sale financial assets:
Debt securities	17,790,127	5,961.8	[1]	17,662,733
Equity securities	824,033	276.2	[1]	729,779
Financial assets available-for-sale	18,614,160	6,238	[1]	18,392,512
Held-to-maturity investments	2,899,039	971.5	[1]	2,570,486
Other financial assets at fair value through profit or loss	2,282,611	765	[1]	2,072,674
Loans and receivables:
Commercial	99,428,894	33,320.7	[1]	93,149,211
Consumer	50,382,895	16,884.3	[1]	46,927,997
Mortgages	16,151,299	5,412.6	[1]	14,683,537
Microcredit	409,688	137.3	[1]	399,431
Allowance for impairment losses	(5,618,481)	(1,882.9)	[1]	(4,261,444)
Loans and receivables, net	160,754,295	53,872	[1]	150,898,732
Other accounts receivable, net	4,239,272	1,420.7		3,524,594
Total loans and receivables	164,993,567	55,292.7	[1]	154,423,326
Hedging derivatives	55,261	18.5	[1]	128,479
Non-current assets held for sale	101,382	34	[1]	259,527
Investments in associates and joint ventures	1,043,014	349.5	[1]	1,146,647
Tangible assets:
Property, plant and equipment to own-use and given in operating lease, net	5,804,073	1,945.1	[1]	5,901,325
Investment properties	783,794	262.7	[1]	610,188
Biological assets	66,139	22.2		48,002
Property, plant and equipment	6,654,006	2,230	[1]	6,559,515
Concession arrangement rights	3,114,167	1,043.6	[1]	2,805,314
Goodwill	6,901,056	2,312.7	[1]	6,824,935
Other intangible assets	848,681	284.4	[1]	735,043
Income tax assets:
Current	907,476	304.1	[1]	584,157
Deferred	139,423	46.7	[1]	194,962
Income tax assets, net	1,046,899	350.8	[1]	779,119
Other assets	519,771	174.2	[1]	589,415
Total assets	236,538,540	79,268.9	[1]	224,073,721
Financial liabilities held for trading
Derivative instruments	298,665	100.1	[1]	640,695
Customer deposits:
Checking accounts	36,017,602	12,070.2	[1]	34,978,189
Savings accounts	55,778,677	18,692.6	[1]	50,573,924
Time deposits	62,616,163	20,984	[1]	58,006,144
Other	472,782	158.4	[1]	328,798
Deposits from customers	154,885,224	51,905.2	[1]	143,887,055
Financial obligations
Interbank borrowings and overnight funds	4,970,430	1,665.7	[1]	6,315,717
Borrowings from banks and others	18,205,320	6,101	[1]	17,906,633
Bonds issued	19,102,196	6,401.5	[1]	18,568,236
Borrowings from development entities	2,998,090	1,004.7	[1]	2,725,695
Financial liabilities	45,276,036	15,172.9	[1]	45,516,281
Total financial liabilities at amortized cost	200,161,260	67,078.1	[1]	189,403,336
Hedging derivatives	13,464	4.5	[1]	43,436
Provisions:
For legal	165,353	55.4	[1]	155,749
Other	527,262	176.7	[1]	464,607
Total Provisions	692,615	232.1	[1]	620,356
Income tax liabilities:
Current	330,828	110.9	[1]	405,081
Deferred	1,696,843	568.6	[1]	1,246,809
Income tax liabilities, net	2,027,671	679.5	[1]	1,651,890
Employee benefits	1,238,172	414.9	[1]	1,097,594
Other liabilities	6,235,466	2,089.6	[1]	5,957,192
Total liabilities	210,667,313	70,598.8	[1]	199,414,499
Equity
Subscribed and paid-in capital	22,281	7.5	[1]	22,281
Additional paid-in capital	8,303,431	2,782.7	[1]	8,307,527
Retained earnings	7,174,418	2,404.3	[1]	6,522,128
Other comprehensive income	786,866	263.7	[1]	749,617
Equity attributable to owners of the parent	16,286,996	5,458.2	[1]	15,601,553
Non-controlling interest	9,584,231	3,211.9	[1]	9,057,669
Total equity	25,871,227	8,670.1	[1]	24,659,222
Total liabilities and equity	$ 236,538,540	$ 79,268.9	[1]	$ 224,073,721
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

Consolidated Statement of Incom

Consolidated Statement of Income $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)$ / shares	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)$ / shares	Dec. 31, 2015COP ($)$ / shares
Interest income
Loan portfolio	$ 17,899,967	$ 5,998.6		$ 16,665,516	$ 13,004,102
Investments in debt securities	841,866	282.1		881,454	1,071,496
Total interest income	18,741,833	6,280.7		17,546,970	14,075,598
Interest expense
Checking accounts	309,333	103.7		258,925	183,218
Savings accounts	1,978,986	663.2		2,139,841	1,426,187
Time deposits	3,560,478	1,193.2		3,413,489	2,222,836
Interest expense on deposits from customers	5,848,797	1,960.1		5,812,255	3,832,241
Financial obligations
Interbank borrowings and overnight funds	287,361	96.3		570,184	340,594
Borrowings from banks and others	770,015	258		575,710	413,809
Bonds issued	1,162,203	389.5		1,278,253	1,041,105
Borrowing from development entities	159,323	53.4		156,003	123,710
Interest expense on other financial liabilities	2,378,902	797.2		2,580,150	1,919,218
Total interest expense	8,227,699	2,757.3		8,392,405	5,751,459
Net interest income	10,514,134	3,523.4		9,154,565	8,324,139
Impairment losses
Loan and other accounts receivable	4,119,334	1,380.5		3,004,184	2,127,750
Other assets	174,255	58.4		47,536	25,950
Other financial assets	142	0		70,411	6,223
Recovery of charged-off financial assets	(264,582)	(88.7)		(290,444)	(219,679)
Net impairment loss	4,029,149	1,350.2		2,831,687	1,940,244
Net interest income, after impairment losses	6,484,985	2,173.2		6,322,878	6,383,895
Commissions
Commission and fee income	5,202,125	1,743.3		4,879,187	4,284,233
Commission and fee expense	(623,114)	(208.8)		(619,528)	(621,946)
Net commission and fee income	4,579,011	1,534.5		4,259,659	3,662,287
Net trading income	561,362	188.1		724,698	245,199
Net income from other financial instruments designated at fair value through profit or loss	209,937	70.4		180,982	153,094
Other income	1,908,768	639.7		2,605,401	2,389,296
Other expense	8,828,836	2,958.7		8,519,773	7,609,115
Net income before tax expense	4,915,227	1,647.2		5,573,845	5,224,656
Income tax expense	1,752,794	587.4		2,056,909	1,878,970
Net income for the year	3,162,433	1,059.8		3,516,936	3,345,686
Net income for the year attributable to:
Owners of the parent	1,962,414	657.6		2,139,866	2,041,364
Non-controlling interest	1,200,019	402.2		1,377,070	1,304,322
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 3,162,433	$ 1,059.8		$ 3,516,936	$ 3,345,686
Net income of the owners of the parent per share (in Colombia pesos, see note 25)	$ 88.076			$ 96.040	$ 91.619
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

Consolidated Statement of Other

Consolidated Statement of Other Comprehensive Income $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Net income for the year	$ 3,162,433	$ 1,059.8		$ 3,516,936	$ 3,345,686
Hedging of net investments in foreign operations:
Net investment in foreign subsidiaries	(47,197)	(15.8)		(475,000)	2,366,849
Hedging derivative instrument	16,832	5.6		291,506	(1,683,346)
Hedging non-derivative instrument	30,568	10.2		35,819	(755,431)
Cash flow hedges	(2,340)	(0.8)		17,967	17,500
Foreign currency translation differences for foreign operations	(91,497)	(30.7)		(125,161)	24,878
Unrealized gains (losses) on available-for-sale financial assets:
Debt financial instruments	284,480	95.3		948,212	(922,083)
Equity financial instruments	57,245	19.2		34,509	(6,548)
Investments in associates and joint ventures	1,128	0.4		(20,061)	31,964
(Expenses) income tax	(97,698)	(32.7)		(378,877)	1,205,865
Other comprehensive income that will be reclassified to profit or loss, net of tax	151,521	50.7		328,914	279,648
Items that will not be reclassified to profit or loss
Actuarial gains (losses) from defined benefit pension plans	(100,232)	(33.6)		(41,228)	6,162
Income (expenses) tax	24,081	8.1		14,521	(7,251)
Other comprehensive income that will not be reclassified to profit or loss, net of tax	(76,151)	(25.5)		(26,707)	(1,089)
Total other comprehensive income	37,249	25.2		302,207	278,559
Total comprehensive income, net of taxes	3,237,803	1,085		3,819,143	3,624,245
Total comprehensive income for the year attributable to:
Owners of the parent	1,999,663	670.1		2,351,354	2,207,165
Non-controlling interest	1,238,140	414.9		1,467,789	1,417,080
Comprehensive income	$ 3,237,803	$ 1,085		$ 3,819,143	$ 3,624,245
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity $ in Millions, $ in Millions		COP ($)	USD ($)	[2]	Subscribed and paid-in capitalCOP ($)	Subscribed and paid-in capitalUSD ($)	[2]	Additional paid - in capitalCOP ($)	Additional paid - in capitalUSD ($)	[2]	Retained earningsCOP ($)	Retained earningsUSD ($)	[2]	Other comprehensive income (OCI)COP ($)	Other comprehensive income (OCI)USD ($)	[2]	Equity attributable to owners of the parentCOP ($)	Equity attributable to owners of the parentUSD ($)	[2]	Non-controlling interestCOP ($)	Non-controlling interestUSD ($)	[2]
Balance at Dec. 31, 2014		$ 21,355,964			$ 22,281			$ 8,311,878			$ 4,961,534			$ 372,328			$ 13,668,021			$ 7,687,943
Disclosure of Consolidated Statement of Changes in Equity [Line Items]
Issuance of shares		112,050			0			33			0			0			33			112,017
Acquisition of non-controlling interest		(7,056)			0			(4,146)			0			0			(4,146)			(2,910)
Dividends declared		(2,178,905)			0			0			(1,303,440)			0			(1,303,440)			(875,465)
Donations		(18)			0			0			(12)			0			(12)			(6)
Other comprehensive income		278,559			0			0			0			165,801			165,801			112,758
Net income		3,345,686			0			0			2,041,364			0			2,041,364			1,304,322
Balance at Dec. 31, 2015		22,906,280			22,281			8,307,765			5,699,446			538,129			14,567,621			8,338,659
Disclosure of Consolidated Statement of Changes in Equity [Line Items]
Change in accounting policies	[1]	(11,931)			0			0			(7,061)			0			(7,061)			(4,870)
Acquisition of non-controlling interest		(238)			0			(238)			0			0			(238)			0
Dividends declared		(2,054,032)			0			0			(1,310,123)			0			(1,310,123)			(743,909)
Other comprehensive income		302,207			0			0			0			211,488			211,488			90,719
Net income		3,516,936			0			0			2,139,866			0			2,139,866			1,377,070
Balance at Dec. 31, 2016		24,659,222			22,281			8,307,527			6,522,128			749,617			15,601,553			9,057,669
Disclosure of Consolidated Statement of Changes in Equity [Line Items]
Acquisition of non-controlling interest		(4,096)			0			(4,096)			0			0			(4,096)			0
Dividends declared		(2,021,702)			0			0			(1,310,124)			0			(1,310,124)			(711,578)
Other comprehensive income		37,249	$ 25.2		0			0			0			37,249			37,249			38,121
Net income		3,162,433	1,059.8		0			0			1,962,414			0			1,962,414			1,200,019
Balance at Dec. 31, 2017		$ 25,871,227	$ 8,670.1		$ 22,281	$ 7.5		$ 8,303,431	$ 2,782.7		$ 7,174,418	$ 2,404.3		$ 786,866	$ 263.7		$ 16,286,996	$ 5,458.2		$ 9,584,231	$ 3,211.9
[1]	2.15 Biological assets: As of January 1, 2016, Grupo Aval changed its accounting policy regarding the measurement of biological assets related to bearer plants, pursuant to IAS 16 amendment (Property, plant and equipment) and IAS 41 (Agriculture). Based on such amendment, bearer plants could be classified as property, plant and equipment for own use and accounted for under the cost model, according to IAS 16; then, they are depreciated during the estimated life of the bearer plants by using the production units method. The biological products of those bearer plants (fruits) are recognized according to IAS 41, at fair value with changes in profit or loss. Until December 31, 2015, bearer plants were recorded as biological assets at fair value with changes recognized in profit or loss. The effect of this accounting change had no material effect on Grupo Aval´s financial statements and for this reason previous financial statements were not adjusted for retrospective application. Other biological assets, including biological assets growing in the bearer plants, are recognized both at the time of their initial recognition and at the end of reporting period at fair value less disposal cost, except for biological assets for which their fair value cannot be measured reliably; in such case they are measured at cost less accumulated depreciation and impairment loss. Gains and losses arising from the initial and subsequent recognition at fair value of the agricultural products are included in profit or loss. Costs incurred in the agricultural production process are also recognized directly in profit or loss. Fair value of biological assets is determined using valuations performed by experienced internal professionals, using discounted cash flow models. The expected cash flows of the crop’s total life are determined by using the market price of the agricultural product currently in effect and the estimated productive life of plants, net of maintenance and harvest costs and of any other costs required for plant maintenance during the production period. Productive life of plants is estimated considering the age, location and type of product. Fair value of the biological assets is dependent on current market prices for each product.
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

Consolidated Statement of Cash

Consolidated Statement of Cash Flows $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Cash flows from operating activities:
Net income before tax expense	$ 4,915,227	$ 1,647.2		$ 5,573,845	$ 5,224,656
Reconciliation of net income before taxes and net cash provided by operating activities:
Depreciation of tangible assets	463,892	155.5		455,851	391,776
Amortization of intangible assets	437,822	146.7		323,677	384,241
Impairment losses of loans and receivables	4,141,573	1,387.9		3,006,191	2,127,750
Net interest income	(10,514,134)	(3,523.5)		(9,154,565)	(8,324,139)
Gains in non-monetary transactions	0	0		(195,514)	0
Impairment of investments, net	140,691	47.1		9,920	0
Effect for change in accounting polices	0	0		6,179	0
(Gains) losses on sales of non-current assets held for sale	(6,611)	(2.2)		(20,659)	10,350
Gains on available for sale financial assets	(51,712)	(17.3)		(210,373)	(79,233)
Writedown in concessions	2,875	1		5,992	0
Recovery of impairment loss on tangible assets	4,832	1.6		1,503	(1,968)
Foreign exchange (gains) losses	(98,977)	(33.2)		247,997	(1,133,522)
Share of undistributed profit of equity accounted investees, net of tax	(171,964)	(57.6)		(140,765)	(230,398)
Interest accrual of issued bonds outstanding	3,489	1.2		6,444	23,110
Fair value adjustments to:
Derivative financial instruments	(164,920)	(55.3)		(228,083)	(74,110)
Financial asset at fair value through profit or losses	11,224	3.8		0	0
Investment property	(46,675)	(15.6)		(53,680)	(104,768)
Biological assets	(13,503)	(4.5)		(14,644)	(22,922)
Changes in operating assets and liabilities:
Decrease in financial assets held for trading	2,106,603	706		2,919,480	8,245,541
Increase in other accounts receivable	(804,970)	(269.8)		(414,734)	(1,047,374)
Decrease in non-current assets held for sale	17,724	5.9		25,800	349,371
Increase (decrease) in derivative financial instruments	49,586	16.6		241,364	(152,854)
Increase (decrease) in other assets	127,209	42.6		179,829	(61,433)
Decrease (increase) in other liabilities and provisions	279,547	93.7		(381,607)	(634,729)
Increase in employee benefits	46,514	15.6		45,139	299
(Increase) in loans and receivables	(14,502,691)	(4,860.2)		(10,422,497)	(12,108,021)
Increase in customer deposits	11,460,395	3,840.6		9,666,367	8,593,143
(Decrease) increase in interbank borrowings and overnight funds	(1,461,985)	(489.9)		(3,404,291)	4,870,580
(Decrease) in borrowings from development entities	(2,229)	(0.7)		(3,131)	(13,327)
Increase of borrowings from banks and others	514,474	172.4		146,656	1,436,109
Interest received	18,124,814	6,074		12,797,281	8,162,908
Interest paid	(8,326,553)	(2,790.4)		(7,417,620)	(3,956,510)
Income tax, wealth tax and equity tax payments	(1,573,251)	(527.2)		(1,112,318)	(519,536)
Net cash provided by operating activities	5,108,316	1,712		2,485,034	11,354,990
Cash flows from investing activities:
Acquisition of property plant and equipment	(473,752)	(158.8)		(814,556)	(920,454)
Acquisition of investment property	(75,817)	(25.4)		(56,610)	(75,458)
Additions to biological assets	(24,409)	(8.2)		(21,432)	(35,265)
Additions to investments in associates and joint ventures	0	0		(16)	11,538
Additions of concession arrangement right	(610,909)	(204.7)		(614,514)	(773,581)
Additions of other intangible assets	(268,757)	(90.1)		(183,662)	(353,633)
(Increase) decrease in available for sale financial assets	(2,231,754)	(747.9)		149,072	(4,610,568)
Proceeds from sales of property and equipment	69,793	23.4		241,598	194,287
Proceeds from sales of investment properties	28,431	9.5		61,786	22,945
Proceeds from sales of biological assets	19,775	6.6		20,670	20,374
Proceeds from sales of non-current assets held for sale	85,395	28.6		151,443	25,456
Proceeds from sale of investments in associates and joint ventures	0	0		0	15,143
Purchases of held-to-maturity financial assets	(3,704,730)	(1,241.5)		(2,668,018)	(3,146,729)
Maturities of held-to-maturity financial assets	3,365,150	1,127.7		2,658,728	2,800,579
Dividends received from investments	171,423	57.4		125,347	79,259
Business combination, net of cash	40,093	13.4		(2,706)	0
Net cash used in investing activities	(3,610,068)	(1,210)		(952,870)	(6,746,107)
Cash flows from financing activities:
Dividends paid to shareholders	(1,307,525)	(438.2)		(1,260,876)	(1,276,544)
Issuance of debt securities	4,548,108	1,524.2		5,800,085	1,158,228
Payment of outstanding debt securities	(3,913,694)	(1,311.6)		(3,728,199)	(1,918,416)
Issuance of common shares	0	0		0	112,050
Acquisition of non controlling interest	(4,096)	(1.4)		(238)	0
Dividends paid to non-controlling interest	(768,769)	(257.6)		(743,909)	(882,519)
Net cash provided by (used in) financing activities	(1,445,976)	(484.6)		66,863	(2,807,201)
Effect of foreign currency changes on cash and cash equivalents	91,562	30.8		(1,691,000)	3,213,535
Increase (decrease) in cash and cash equivalents	143,834	48.2		(91,973)	5,015,217
Cash and cash equivalents at beginning of year	22,193,004	7,437.3		22,284,977	17,269,760
Cash and cash equivalents at end of year	$ 22,336,838	$ 7,485.5		$ 22,193,004	$ 22,284,977
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

REPORTING ENTITY

REPORTING ENTITY	12 Months Ended
	Dec. 31, 2017
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Abstract]
Disclosure of notes and other explanatory information [text block]	NOTE 1 – REPORTING ENTITY Grupo Aval Acciones y Valores S.A. (hereinafter the “The Group” or “Grupo Aval”) was established under Colombian law in January 7, 1994, with its main offices and business address registered in Bogotá, D.C., Colombia. The corporate purpose of Grupo Aval is the purchase and sale of securities issued by financial and commercial entities. Grupo Aval is the majority shareholder of Banco de Bogotá S.A., Banco de Occidente S.A., Banco Popular S.A. and Banco Comercial AV Corporación Financiera Colombiana S.A. Sociedad Administradora de Fondos de Pensiones y Cesantías Porvenir S.A. In performing its activities and pursuant to the corporate bylaws, Grupo Aval may (i) promote the creation of all types of companies The duration of Grupo Aval set forth under the bylaws is until May 24, 2044, but the Company may be dissolved before such term expires, or it may be extended by free decision When preparing its consolidated financial statements, Grupo Aval Acciones y Valores S.A, directly consolidates the following entities: Banco de Bogotá S.A. Banco de Bogotá, in which Grupo Aval holds 68.74% of the voting rights as at December 31, 2017, was established as a bank on November 15, 1870. The operating license was granted by the Superintendency of Finance through Resolution Number 3140 of September 24, 1993. The commercial purpose of Banco de Bogotá is to participate and perform all operations and contracts legally authorized to commercial banking, subject to the limitations and requirements set forth under Colombian laws and regulations. The following table presents details of Banco de Bogotá’s most significant subsidiaries which are indirectly consolidated by Grupo Aval as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Main Local Direct Subsidiaries Fiduciaria Bogotá S.A Management of trust funds. Bogotá, Colombia 94.99 % 65.29 % Porvenir S.A. and its subsidiary Management of pension and severance funds. Bogotá, Colombia 100 % 75.69 % Almaviva S.A and its subsidiaries Logistics services. Bogotá, Colombia 95.81 % 65.85 % Main International Direct Subsidiaries Leasing Bogotá Panama S.A. Holding company. (1) Panamá, Republic of Panamá 100 % 68.74 % Banco de Bogotá Panamá S.A. Commercial banking services. Panamá, Republic of Panamá 100 % 68.74 % Main Indirect Subsidiaries BAC Credomatic Inc. Holding company in charge of managing the banking and related subsidiaries in Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua and Panamá, among others. (Subsidiary of Leasing Bogotá Panamá S.A.). Panamá, Republic of Panamá 100 % 68.74 % (1) Leasing Bogotá Panamá, has no restrictions for transferring dividends to Colombia. Banco de Occidente S.A. Banco de Occidente S.A., in which Grupo Aval holds 72.27% of the voting rights as of December 31, 2017, was established as a banking entity on September 8, 1964, and authorized to operate under the terms of the renewal resolution No. 3140 dated September 24, 1993 issued by the Superintendency of Finance of Colombia. The commercial purpose of Banco de Occidente is to participate and perform all operations and contracts legally authorized to commercial banking, subject to the limitations and requirements set forth under Colombian laws and regulations. The following table presents the details of Banco de Occidente’s most significant subsidiaries, which are indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Fiduciaria de Occidente S.A. Management of trust funds. Bogotá, Colombia 99.99 % 71.05 % Banco de Occidente (Panamá). S.A. Commercial banking services. Panamá, Republic of Panamá 95.00 % 68.66 % Occidental Bank Barbados Ltd. Commercial banking services. Barbados 100 % 72.27 % Banco Popular S. A. Banco Popular S. A., in which Grupo Aval holds 93.74% of the voting rights at December 31, 2017, was established as a banking entity on July 5, 1950. Authorized to operate under the terms of the renewal resolution No. 3140 dated September 24, 1993 issued by the Superintendency of Finance of Colombia. Its commercial purpose is to participate in and perform all operations and contracts legally authorized to commercial banking, subject to the limitations and requirements set forth under Colombian laws and regulations. The following table presents the details of Banco Popular’s most significant subsidiaries which are indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Fiduciaria Popular S.A. Management of trust funds. Bogotá, Colombia 94.85 % 88.91 % Alpopular S.A. Conservation and custody of documents; transportation of products at national and international levels. Bogotá, Colombia 71.10 % 66.65 % Banco Comercial AV Villas S. A. Banco Comercial AV Villas S. A., in which Grupo Aval holds 79.89% of the voting rights as of December 31, 2017, was incorporated as a banking entity on November 24, 1972. The commercial purpose of Banco AV Villas is to participate and perform all operations and contracts legally authorized to commercial banking, subject to the limitations and requirements imposed by Colombian laws and regulations. It was authorized to operate under the terms of the renewal resolution No. 3352 dated August 21, 1992 issued by the Superintendency of Finance of Colombia. The following table presents the details of Banco AV Villas’ most significant subsidiary which is indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic A Toda Hora S.A. ATH ATM network services and maintenance and software development Bogotá, Colombia 100 % 78.90 % Corporación Financiera de Colombia S.A. Until June 21, 2016, Corficolombiana was controlled by Banco de Bogotá S.A. on that same date an agreement was signed between Grupo Aval, Banco de Bogotá, Banco de Occidente and Banco Popular, whom together held at that point a combined stake in Corficolombiana of 58.49%, in which Grupo Aval would assume direct control of Corficolombiana. This legal reorganization had no impact on the consolidated financial statements of Grupo Aval, a part from having a new reportable segment(see note 31). Corficolombiana S.A., in which Grupo Aval holds at December 31, 2017 58.49% of voting rights, is a merchant bank authorized to operate by the Superintendency of Finance of Colombia by resolution of October 18, 1961. Corficolombiana´s core business is the active management of an equity portfolio through controlling and non-controlling investments in key strategic sectors, including infrastructure, energy and gas, agriculture and hotels. The following table presents the details of Corficolombiana´s most significant subsidiaries which are indirectly consolidated by Grupo Aval, at December 31, 2017: Main Indirect Subsidiaries Subsidiary Core business Location Total voting Total economic Fiduciaria Corficolombiana S.A. Trust services Bogotá, Colombia 100 % 44.79 % Leasing Corficolombiana S.A. Financial services Bogotá, Colombia 100 % 44.79 % Banco Corficolombiana Panamá S.A. Commercial banking services. Panamá, Republic of Panamá 100 % 44.79 % Casa de Bolsa S.A. Securities brokerage and securities funds management. Bogotá, Colombia 97.30 % 63.84 % Hoteles Estelar S. A. and its subsidiaries Construction and operation of hotels, directly owned by third parties, in Colombia and abroad. Bogotá, Colombia 84.96 % 38.05 % Estudios y Proyectos del Sol S.A.S. and its subsidiaries Infrastructure projects. Bogotá, Colombia 100 % 44.79 % Pizano S.A. and its subsidiaries Timber production and transformation, industrial products manufacturing, construction supplies production. Bogotá, Colombia 59.38 % 31.27 % Organización Pajonales S. A. and its subsidiaries Investment and promotion of agricultural, livestock, forestry and agro industrial companies. Bogotá, Colombia 98.67 % 44.19 % Promigas S.A. E.S.P. and its subsidiaries Transportation and distribution of natural gas. Barranquilla, Colombia 50.23 % 22.50 % Estudios, Proyectos e Inversiones de los Andes S.A. and its subsidiaries Infrastructure projects. Bogotá, Colombia 99.93 % 44.76 % Plantaciones Unipalma de los Llanos S.A Development, production and sale of african palm products. Bogotá, Colombia 54.53 % 24.42 % Colombiana de Licitaciones y Concesiones S.A.S Infrastructure projects. Bogotá, Colombia 100 % 44.79 % Proyectos de Infraestructura S.A. – PISA and its subsidiaries Road and Infrastructure Concessions. Cali, Colombia 88.25 % 39.53 % Grupo Aval Limited is an affiliate of Grupo Aval in Cayman Islands. It was established on December 29, 2011. Grupo Aval Limited is a limited liability company registered with the Assistant of the Registrar of Companies of Cayman Islands under registry number MC-265169, with its Main Office located in Ugland House, South Church Street, George Town, Grand Cayman KY1-1104. It was constituted as a special purpose vehicle for issuing foreign debt. Grupo Aval International Limited Grupo Aval International Limited is an affiliate of Grupo Aval in Cayman Islands and was established on October 8, 2012. Grupo Aval International Limited is a limited liability company registered with the Assistant of the Registrar of Companies of Cayman Islands under registry number MC-272253, with its Main Office located in Ugland House, South Church Street, George Town, Grand Cayman KY1-1104. It was constituted as a special purpose entity for issuing foreign debt. Between December 31, 2016 and December 31, 2017 there were no significant changes in Grupo Aval´s interest in its subsidiaries. Companies integrating Grupo Aval in Colombia, are subject to the following restrictions to transfer profits or perform transactions, in accordance with the legal standards in Colombia: · Grupo Aval subsidiaries in Colombia should assign 10% of its profits as legal reserves before distributing any dividends to its shareholders. · Domestic financial companies of Group Aval may not grant loans to other companies of Grupo Aval that exceed 10% of its regulatory capital if the loan is unsecured or 25% if it is granted with an acceptable guarantee under the Superintendency of Finance rules. · Pursuant to article 2.1.2.1.8 of Decree 2555 of 2010, banks in Colombia have a lending limit of 30% of their regulatory capital with respect to loans granted to financial entities. Foreign subsidiaries of Grupo Aval do not have any restriction to transfer dividends to the parent company, except for legal reserve mentioned above. Lending operation in general have restrictions similar to those of banks in Colombia, described above. Grupo Aval and its subsidiaries do not have significant restrictions on their ability to access or use their assets and settle their liabilities other than those resulting from the supervisory frameworks within which banking subsidiaries operate. The supervisory frameworks require banking subsidiaries to keep certain levels of regulatory capital (see note 4.6) and liquid assets (see note 4.5), limit their exposure to other parts of Grupo Aval and its subsidiaries and comply with other ratios.

BASIS OF PREPARATION OF THE CON

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2017
Disclosure of voluntary change in accounting policy [abstract]
Disclosure of voluntary change in accounting policy [text block]	NOTE 2 – BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The consolidated financial statements of Grupo Aval have been prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (IASB). The consolidated financial statements have been prepared on a basis of historical cost basis, except for financial assets held for trading, at fair value through profit or loss, available-for-sale, derivative financial instruments, investment properties, assets held for sale and biological assets which are measured at fair value. Additionally, non-current assets held for sale are measured at the lower value of their carrying value at the time of transfer and fair value, minus estimated costs of disposal and employee benefits which are measured at the present value of the defined benefit obligation (see note 2.21). The consolidated financial statements were authorized for issuance by the Audit Committee on April 17, 2018. The main accounting policies applied in preparing the consolidated financial statements of Grupo Aval as of December 31, 2017, 2016 and, 2015 are the following: 2.1 Basis of preparation a) Presentation of Consolidated Financial Statements The consolidated financial statements are prepared as follows: ⋅ The consolidated statement of financial position presents assets and liabilities based on liquidity since it provides reliable and more relevant information, than separate current and non-current classifications. ⋅ The consolidated statements of income and other comprehensive income are presented separately. The statement of income is presented by nature, as it provides reliable and more relevant information. ⋅ The consolidated statements of cash flows are presented using the indirect method, accordingly, net cash flows from operating activities are determined by reconciling profit before taxes, due to the effects of the non-cash items, net changes in assets and liabilities from operating activities, and for any other effects that are not classified as investing or financing activities. Revenue and expenses due to interest received and paid are part of operating activities. b) Consolidated financial statements Grupo Aval prepares its consolidated financial statements with controlled entities. Grupo Aval controls an investee if it is exposed to, or has rights to, variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Grupo Aval reassesses whether it has control if there are changes to one or more of the elements of control. The financial statements of subsidiaries are consolidated in the financial statements of Grupo Aval since the date Grupo Aval acquires control until the date control is lost. During the consolidation process, Grupo Aval combines the assets, liabilities and profits or losses of those entities under control, previously aligning the accounting policies in all the subsidiaries. Such process includes eliminating intragroup balances and transactions and any unrealized and realized income and expense (except for foreign currency translation gains or losses) arising from intra-group transactions. Unrealized and realized losses are eliminated in the same way as unrealized and realized gains but only to the extent that there is no evidence of impairment. Non-controlling interest is presented in the consolidated statement of financial position of Grupo Aval separate from that attributable to equity holders of Grupo Aval. For consolidation purposes, the statements of financial position and income of Grupo Aval´s foreign subsidiaries are translated to Colombian pesos, as follows: ⋅ Assets and liabilities are translated at the closing exchange rate at the reporting date; ⋅ Income and expense of foreign operations are translated at monthly average exchange rates since those averages approximate the exchange rates of each specific transaction; ⋅ All resulting exchange differences are recognized in other comprehensive income and accumulated in the foreign currency translation reserve except to the extent that the translation difference is allocated to non-controlling interests. c) Investments in associates Associates are companies in which Grupo Aval has significant influence but not control. Investments in associates are accounted for under the equity method. They are presented in the statement of financial position as ”Investments in associates and joint ventures” (additionally see Note 2.1.d) “Joint arrangements”). Grupo Aval exercises significant influence over another entity if it owns, directly or indirectly, 20% or more of the voting power of the investee, unless it is clearly evidenced that such influence does not exist. Under the equity method, investments in associates are initially recognized at cost and subsequently adjusted by Grupo Aval´s share in the associates income and other comprehensive income with credit or charge to Grupo Aval’s profit or loss account and other comprehensive income, respectively of the net income, and other comprehensive income of the investee. Dividends received or receivable from associates and joint ventures are recognized as a reduction in the carrying amount of the investment. When the group’s share of losses in an equity-accounted investment equals or exceeds its interest in the entity, including any other unsecured long-term receivables, Grupo Aval does not recognize further losses, unless it has incurred obligations or made payments on behalf of the other entity. Unrealized gains on transactions between Grupo Aval and its associates are eliminated to the extent of Grupo Aval’s interest in these entities. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the asset transferred. Accounting policies of equity accounted investees have been changed where necessary to ensure consistency with the policies adopted by Grupo Aval. The carrying amount of equity-accounted investments is tested for impairment d) Joint arrangements A joint arrangement is one in which two or more parties have joint control of the arrangement. Joint arrangements are divided into joint operations, in which the parties having joint control of the agreement have rights to the assets and obligations with respect to the liabilities relating to the agreement, and joint ventures, wherein the parties having joint control are entitled to the net assets of the agreement. Grupo Aval recognizes joint operations in the consolidated financial statements based on their proportional and contractual participation in each of the assets, liabilities and profit or loss of the contract or entity wherein the agreement is held. In addition, Grupo Aval recognizes joint ventures by the equity method, in the same manner as investments in associates. 2.2 Grupo Aval functional currency Grupo Aval´s management has determined the Colombian Peso as the functional and presentation currency for preparing the consolidated financial statements. The foreign subsidiaries have other functional currencies, mainly the U.S. dollar. 2.3 Transactions in foreign currencies Foreign currency transactions are translated into the functional currency of Grupo Aval entities at the prevailing exchange rate at the date of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated into the functional currency using the prevailing exchange rate at the reporting date. Non-monetary assets and liabilities denominated in foreign currencies in terms of historical costs are measured using the exchange rate at the transaction date. Financial instruments measured at fair value are translated using the exchange rate from the date the fair value was determined. Profit or loss resulting from the translation process are recognized in profit or loss. At December 31, 2017, and 2016, the representative market rates as computed and certified by the Superintendency of Finance(for the U.S.$ which is the most representative foreign currency for Grupo Aval´s transactions) were Ps. 2,984.00 and Ps. 3,000.71 per U.S. $1, respectively. 2.4 Convenience translation in to U.S. dollars The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate. 2.5 Cash and cash equivalents Cash and cash equivalents include cash, bank deposits, and other short-term investments with original maturities of three months or less from the date of their acquisition that are subject to an insignificant risk of changes in their fair value and are used by Grupo Aval in the management of its short-term commitments. 2.6 Financial assets a) Definition A financial asset is an asset that is: · Cash. · An equity instrument of another entity. · A contractual right to receive cash or another financial asset from another entity or to exchange financial assets or financial liabilities with another entity under conditions that are potentially favorable to the entity, or · A contract that will or may be settled in the entity´s own equity instruments and is a non-derivative. b) Classification For accounting purposes, financial assets are classified at initial recognition into four categories: · Fair value through profit or loss: (i) Held for trading financial assets acquired to generate short term profits or that is part of a portfolio of financial instruments managed together for that purpose. (ii) Some financial assets under concessions contracts are included in this category in order to obtain more relevant information, either because this eliminates or significantly reduces recognition or measurement inconsistencies (accounting mismatches) that would otherwise arise from measuring assets or recognizing the gains or losses on them on different bases, in accordance with a documented risk management or investment strategy, and information is provided on that basis to Grupo Aval’s key management personnel. This classification adequately reflects the present market expectations over future costs comprising the amount of the concession to be negotiated with the different Colombian Government, upon the termination of the concession or its renewal. · Held-to-maturity Investments: These are debt securities with fixed or determinable payments and a fixed maturity date, which Grupo Aval intends and has the ability to hold to maturity. · Loans and receivables: These are financial assets of fixed or determinable payments that are not quoted in active markets and are not classified as either trading or available-for-sale. · Available-for-sale: These are financial assets that are designated initially as available-for-sale and are those not classified as loans and receivables, or as held-to-maturity investments. c) Initial measurement Grupo Aval initially recognizes loans and receivables, on the date on which they are originated. All other financial instruments (including regular-way purchases and sales of financial assets) are recognized on the trade date, which is the date on which Grupo Aval becomes a party to the contractual provisions of the instrument. Financial assets not measured at fair value through profit or loss are initially measured at fair value plus any directly attributable transaction costs. d) Subsequent measurement Subsequent to initial recognition, financial assets are measured as follows: · At fair value through profit or loss: are measured daily at their fair value with changes recognized in profit or loss. · Loans and receivables and held-to-maturity investments: are measured at their amortized cost, calculated based on the effective interest rate method, less any impairment. The effective interest rate method is a method of calculating the amortized cost of a financial asset and allocating the interest income or expense over the relevant period. The effective interest rate is the rate that discounts future cash payments or receipts (without consideration of future credit losses, over the expected life of the financial instrument) to the net carrying amount of the financial asset at initial recognition. In the process of calculating the effective interest rate, Grupo Aval estimates the cash flows considering the contractual terms including prepayment expectations of the financial instrument for portfolios with high prepayment levels, except for future credit losses and considering the initial fair value plus transaction costs and premiums granted, minus commissions and discounts received which form integral part of the effective rate. · Available-for-sale: - Debt instruments are initially recognized at fair value. The effective interest rate method is used in order to calculate the amortized cost of the instrument to determine interest income that is recognized in profit or loss. Any changes in fair value are recognized in Other Comprehensive Income (OCI). Impairment losses and foreign exchange gains and losses on available-for-sale debt instruments are excluded from the fair value gains and losses recognized in other comprehensive income and are recognized in profit or loss as incurred. - Available-for-sale equity instruments are recognized at fair value, with gains or losses recognized in other comprehensive income. Dividends received from such instruments are recognized in profit or loss when Grupo Aval becomes entitled to receive the payment and impairment losses are recognized in profit or loss. - When available-for-sale financial assets are sold, the accumulated values in other comprehensive income are reclassified to profit or loss. e) Reclassifications Subsequent to their initial classification, financial assets shall not be reclassified to other categories, except for special circumstances. In the event of such circumstances, transfers shall be accounted for as follows: · From the category “fair value through profit or loss” to other categories: assets are recognized at their fair value. · From available-for-sale to held-to-maturity investment: the fair value amount recognized immediately before the reclassification to held-to-maturity category becomes the basis for the amortized cost. In reclassification of an asset with a fixed maturity, any gain or loss previously recognized in other comprehensive income (OCI) and the difference between the newly established amortized cost and the maturity amount are both amortized over the remaining term of the financial asset using the effective interest rate method. However, any gain or loss previously recognized in other comprehensive income is immediately reclassified from equity to profit or loss if the asset is subsequently impaired. For a financial asset with no stated maturity, any gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss when the financial asset is disposed of or impaired. · From held-to-maturity investment to available-for-sale: the difference between the amortized cost and fair value as of the reclassification date is recognized in other comprehensive income. f) Fair value of financial assets Fair value is the price to be received from the sale of an asset or paid for transferring a liability in an orderly transaction between market participants at the measurement date. Fair value of financial assets is determined as follows: · When available, Grupo Aval measures the fair value of an instrument using the quoted price in an active market for that instrument. A market is regarded as active if transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis. · If there is no quoted price in an active market, then Grupo Aval uses valuation techniques that maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The chosen valuation technique incorporates all of the factors that market participants would take into account in pricing a transaction. (See Note 5). g) Impairment of financial assets Grupo Aval assesses whether there is objective evidence that a financial asset or a group of financial assets is impaired depending on its classification. For financial assets measured at amortized cost, objective evidence includes: significant financial difficulties of the borrower, default or delinquency by a borrower, restructuring of a loan or advance on terms that Grupo Aval would not consider otherwise, indications that a borrower or issuer will enter bankruptcy, disappearance of an active market for a security or observable data relating to a group of assets such as adverse changes in the payment status of borrowers or issuers in Grupo Aval, or economic conditions that correlate with defaults. If there is objective evidence of impairment, impairment is recognized in profit or loss. The amount of the allowance is determined as follows: · Grupo Aval performs an individual assessment of significant financial assets classified as held until maturity and loans and receivables, analyzing the debt profile of each debtor, the guarantees granted and information provided by credit risk agencies. Financial assets are deemed impaired when based on information and current and past events it is likely that Grupo Aval may not collect all the amounts due in the original contract, including interest and fees. If a financial asset has been identified as impaired, the amount of the loss is measured as the difference between the carrying amount of the financial asset and the present value of the future cash flows expected pursuant to the debtor’s conditions, discounted at the original effective interest rate, or the present value of the collateral guarantee covering the asset, less the estimated costs of sale when it is determined that the most important source of collection of the loan is such guarantee. · For those financial assets which are not deemed individually as significant and for individually significant financial asset portfolios which were not determined as impaired after the individual assessment described above, Grupo Aval carries out a collective assessment of impairment. For this purpose, financial assets are grouped together into segments with similar characteristics, using statistical assessment techniques based on an analysis of historical losses to determine an estimated percentage of losses which could have been incurred in such assets as of the date of the reporting, but that have not been identified on an individual basis (See Note 4 for further details regarding the calculation of the collective allowance). · Once an allowance is recorded for a financial asset or a group of similar financial assets, due to an impairment loss, interest income of the loan continues to be recognized using the same effective interest rate applied to the carrying value of the loan. Impaired financial assets are charged off from the consolidated statement of financial position when the recovery of any recognized amount is considered to be unlikely. Collections charged-off of financial assets are recognized in profit or loss. For available-for-sale debt securities, Grupo Aval assesses objective evidence for impairment following the same criteria used for loans and receivables, which could include: · significant financial difficulty of the issuer or counterparty; or · breach of contract, such as a default or delinquency in interest or principal payments; or · indication that a borrower or issuer will enter bankruptcy or reorganization; or · the disappearance of an active market for that financial asset because of financial difficulties. For available-for-sale equity instruments, a significant or prolonged decline in the fair value of the security below its cost is considered to be an objective evidence of impairment. When there is objective evidence at the measurement date that excesses of carrying value over fair value are due to an impairment that is other than temporary, cumulative gains or losses previously recognized in equity under “Other Comprehensive Income” are reclassified to profit or loss. In respect of available-for-sale debt instruments, impairment losses are subsequently reversed through profit or loss if an increase in the fair value of the investment can be objectively related to an event occurring after the recognition of the impairment loss. For available-for-sale equity instruments impairment losses previously recognized in profit or loss are not reversed through profit or loss. Any increase in fair value subsequent to an impairment loss is recognized in equity under “Other Comprehensive Income”. Once the impairment losses have been estimated, they are charged to profit or loss of the period and credited to an allowance sub-account in the respective financial asset category. h) Troubled debt restructured loans Troubled debt restructured loans are those that have collection problems in which Grupo Aval grants the debtor a modification that it would not otherwise consider. These modifications generally involve interest rate reductions, extension of deadlines for payment or reductions in the balance due to a troubled debt loan. If the terms of a financial asset are renegotiated or modified or an existing financial asset is replaced with a new one due to financial difficulties of the borrower, then an assessment is made of whether the financial asset should be derecognized. If the cash flows of the renegotiated asset are substantially different, then the contractual rights to cash flows from the original financial asset are deemed to have expired. In this case, the original financial asset is derecognized and the new financial asset is recognized at fair value. The impairment loss before an expected restructuring is measured as follows. · If the expected restructuring will not result in derecognition of the existing asset, then the estimated cash flows arising from the modified financial asset are included in the measurement of the existing asset, and based on their expected timing and amounts are discounted at the original effective interest rate of the existing financial asset. · If the expected restructuring will result in derecognition of the existing asset, then the expected fair value of the new asset is treated as the final cash flow from the existing financial asset at the time of its derecognition. This amount is discounted from the expected date of derecognition to the reporting date using the original effective interest rate of the existing financial asset. i) Transfers of financial assets The accounting treatment of transfers of financial assets is conditioned by the transfer of risks and rewards, associated with the asset. Those financial assets are only derecognized when the cash flows generated by the asset have been transferred or when the implicit risks and rewards have been substantially transferred to third parties. In this case, the transferred financial asset is derecognized from the consolidated statement of financial position, simultaneously recognizing any right or obligation retained or recording a profit or loss on the transfer (see note 34). If the risks and/or rewards associated with the financial asset transferred are substantially retained: · The transferred financial asset is not derecognized and continues to be valued using the same criteria applied before the transfer ; · A financial liability is recognized in an amount that equals the compensation received, which is subsequently valued at amortized cost; and · Both the income associated with the transferred financial assets (but not derecognized) as well as the expenses associated with the new financial liability will continue to be recognized in the consolidated financial statements of Grupo Aval. j) Offsetting of financial instruments in the consolidated statement of financial position Financial assets and liabilities are offset, and the net amount is recognized in the consolidated statement of financial position, when there is a legally enforceable right to offset recognized amounts and management intends to settle them on a net basis or to realize the asset and settle the liability simultaneously. k) Repurchase agreements and reverse repurchase agreements Purchases of financial instruments under a non-optional resale agreement are measured at fair value and recognized as assets in the consolidated statement of financial position under loans and receivables to credit institutions – Reverse repurchase agreements or loans and receivables to customers – Reverse repurchase agreements (see note 34). The excess of the purchase prices over the resale prices is recognized as interest income over the contractual term. Sales of financial instruments under a non-optional repurchase agreement are measured at fair value and recognized as liabilities in the consolidated statement of financial position under Deposits from the Central Bank – Repurchase agreements, Deposits from credit institutions – Repurchase agreements or Customer deposits – Repurchase agreements (see note 34). The excess of the sales prices over the repurchase prices is recognized as interest expense over the contractual term. 2.7 Derecognition of financial assets Financial assets are derecognized from the consolidated statement of financial position only when all the risks and rewards of the asset have been substantially transferred to third parties or when the rights have been legally extinguished. 2.8 Derivative financial instruments and hedging accounting A derivative is a financial instrument whose value changes in response to changes in one or more variables denominated as an “underlying” (a specific interest rate, the price of a financial instrument, a listed commodity, a foreign currency exchange rate, etc.), that has an initial net investment smaller than would be required for other instruments that have a similar response to the mentioned variable and that is settled in a future date. Grupo Aval trades in financial markets, forward contracts, future contracts, swaps and options that fulfil the definition of a derivative. Derivative transactions are initially recognized at fair value. Subsequent changes in the fair value are recognized in profit or loss, unless the derivative instrument is designated as a hedging instrument and, in this case, the accounting criteria will depend on the nature of the hedged item, as described below: · For fair value hedge of assets or liabilities and firm commitments, changes in the fair value of the derivative instrument are recognized in profit or loss, as well as any other change in the fair value of the asset, liability or firm commitment attributable to the hedge risk. · For cash flow hedge of a particular risk associated with a recognized asset or liability or a projected highly probable transaction, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income. The gain or loss relating to the portion that is not effective for hedging or that does not relate to the hedged risk is immediately recognized in profit or loss. The values accumulated in other comprehensive income are transferred to profit or loss in the same period in which the hedged item is recognized in profit or loss. · Hedging of net investments in a foreign operation is recognized similarly to cash flow hedging: the effective portion of changes in fair value of the hedging instrument is recognized in other comprehensive income, and the ineffective portion of the changes in fair value of the derivative is recognized in profit or loss. The hedging instrument's gains or losses accumulated in equity will be recognized in profit or loss when the net investment in foreign operations is sold in whole or proportionally, if partially disposed of. At the beginning of the hedging transaction, Grupo Aval formally documents the relationship existing between the hedging instrument and the hedged item, including the risk management objective and strategy in undertaking the hedging relationship. It also documents its assessment, both initially as well as on a recurring basis, of whether the hedging relationship is highly effective in offsetting the changes in fair value or cash flows of the hedged items. Financial assets and liabilities from transactions with derivatives are not offset in the consolidated statement of financial position. However, when there is a legal and exercisable right to offset the recognized values and Grupo Aval intends to be settle them on a net basis or to realize the assets and settle the liability simultaneously, derivatives are presented as net values in the consolidated statement of financial position. 2.9 Non-current assets held for sale Foreclosed assets and non-current assets held for sale, which Grupo Aval intends to sell in a period of less than one year, and it is considered highly probable that their value will be recovered primarily through sale rather than through continuing use, are recognized as "non-current assets held for sale". These assets are measured at the lower of their carrying value at the time of transfer and fair value, less estimated disposal costs. 2.10 Financial guarantees Financial guarantees are those contracts requiring that the issuer carries out specific payments to reimburse the creditor for losses incurred when a specific debtor defaults its payment obligation, in accordance with the original or modified conditions, of a debt instrument; regardless of its legal form. Liabilities arising from financial guarantees are initially measured at fair value, which is generally the value of the fee received, adjusted for the directly attributable transaction costs incurred, and the initial fair value is amortized over the life of the guarantee or the commitment. The liability is subsequently carried at the higher of this amortized amount and the present value of any expected payment to settle the liability when a payment under the contract has become probable. The financial guarantees are periodically reviewed with the purpose of determining the credit risk exposure, and, as the case may be, estimate the need to recognize a provision, which is determined by applying criteria similar to those established to quantify the losses for financial assets impairment. The provisions established over financial guarantee agreements classified as impaired, are recognized as liabilities under “Provisions – other provisions” and recognized in profit or loss. 2.11 Property, plant and equipment for own use Property, plant and equipment include the assets, owned or under financial leases held by Grupo Aval for current or future use and which expects to be used for more than one period. They are recognized in the consolidated statement of financial position at their acquisition or construction cost, less the corresponding accumulated depreciation and, if applicable, the estimated impairment losses resulting from comparing the carrying amount of each asset with its recoverable value. Depreciation is calculated by applying the straight-line method over the acquisition cost of the assets, less any residual value; land is not depreciated. Depreciation is estimated on a straight-line basis during the estimated useful life of the asset. The annual depreciation rates for each item of assets are: Asset Useful Life Own use buildings According to appraisals without exceeding 70 years Equipment, furniture and accessories From 3 to 10 years Machinery and equipment From 5 to 25 years Computer equipment From 3 to 12 years Vehicles From 5 to 10 years Bearer plants From 25 to 35 years Conservation and maintenance expense is recognized as incurred as “Administrative Expense”. According to the changes in accounting policies discussed in 2.15 below, the biological assets that meet the definition of bearer plants are accounted for as property, plant and equipment. A bearer plant is a live plant that meets the following requirements: a) It is used for the manufacturing or supply of agricultural product

JUDGEMENTS AND CRITICAL ACCOUNT

JUDGEMENTS AND CRITICAL ACCOUNTING ESTIMATES IN APPLYING ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2017
Disclosure Of Accounting Judgements And Estimates Explanatory [Abstract]
Disclosure of accounting judgements and estimates [text block]	NOTE 3 – JUDGEMENTS AND CRITICAL ACCOUNTING ESTIMATES IN APPLYING ACCOUNTING POLICIES Grupo Aval’s management makes estimates and assumptions that affect the amounts recognized in the consolidated financial statements and the carrying value of the assets and liabilities within the fiscal year. The judgments and estimates are continuously evaluated and are based on the experience of management and other factors, including the occurrence of future events that are believed as reasonable under the current circumstances. Management also makes certain judgments besides those which involve estimates during the process of applying accounting policies. The judgments that have the most significant effects on the amounts recognized in the consolidated financial statements and the estimates that may cause an important adjustment to the value in the carrying value of assets and liabilities in the following year include the following: Held-to-maturity financial assets. Management applies judgment in assessing whether financial assets can be categorized as held-to-maturity. In particular (a) its intention and ability to hold the assets to maturity and (b) whether the assets are quoted in an active market. If Grupo Aval fails to keep these investments to maturity other than in certain specific circumstances – for example, selling an insignificant amount close to maturity – it will be required to reclassify the entire class as available-for-sale. The investments would, therefore, be measured at fair value rather than amortized cost. If the entire class of held-to-maturity investments is reclassified, the carrying amount in 2017 would increase by Ps. 29,890 (2016 decrease by Ps. 12,153) with a corresponding entry in other comprehensive income. Impairment of available-for-sale financial assets. In making this judgment, Grupo Aval, among other factors, considers the volatility in the security price. In addition, impairment may be appropriate when there is evidence of changes in technology or a deterioration in the financial health of the investee, industry and sector performance, or operating or financing cash flows. Had all the declines in fair value below cost been considered significant or prolonged, Grupo Aval would have recorded an additional impairment loss of Ps. 124,356 (2016: Ps. 471,619 and 2015: Ps. 892,405), which would be reclassified from other comprehensive income to profit or loss for the year. Loan impairment allowance: Grupo Aval regularly revises its loan portfolio to evaluate its impairment. In determining if an impairment should be registered through profit or loss for the year, management determines if there are observable data indicating a decrease in the estimated cash flow of the loan portfolio, before the decrease in such flow may be identified for a particular loan of the portfolio. The process used to calculate the provision includes an analysis of specific, historical and subjective components. The methods used by Grupo Aval include the following: · A regular detailed analysis of the loan portfolio. · A system of classifying loans according to risk levels. · A regular review of the summary of loan-loss provisions. · Identification of loans to be assessed individually for impairment. · Consideration of internal factors such as our size, organizational structure, the structure of the loan portfolio, the loan management process, a trend analysis of non-performing loans and historical loss experiences. · Consideration of the risks inherent in different types of loans. · Consideration of external factors - local, regional and national - as well as economic factors. Main sources of uncertainty in loan impairment calculations are detailed below: In the process of calculating impairment for loans deemed individually significant, based on the discounted cash flow method, Grupo Aval´s management makes assumptions as to the amount to be recovered from each customer and when it will be recovered. Any change in this estimate can generate significant changes in the value of the provision that is established. In calculating provisions for loans considered to be individually significant, based on their collateral, management estimates the fair value of the collateral with the help of independent appraisals. In turn, any variation in the price ultimately obtained in recovering the collateral can prompt significant changes in the value of the allowances. In the process of calculating the collective impairments allowance for loans, management focuses on loans that are not considered individually significant or loans that are individually significant but that have not been previously impaired. The historic loss rates used in the process are regularly updated to include the most recent data that reflects current economic conditions, trends in industry performance, geographic concentrations or concentrations of borrowers within each portfolio segment, and any other relevant information that could affect the estimation of loan impairment provisions. Many factors can affect estimates of the provisions for losses on loans granted by Grupo Aval, including volatility in the probability of impairment, migration and estimates of the severity of the losses. To quantify the losses incurred in collectively assessed portfolios, Grupo Aval has calculation methods that take into account four main factors: exposure at default, probability of default, the loss identification period and the loss given default as explained below. For such purposes, loans are considered in default when they are past due for more than 90 days, restructured loans due to financial problems for the debtors, clients in bankruptcy and clients included in credit risk categories D or E, according to internal credit risk evaluation models. · Exposure at default (EAD) is the amount of risk incurred at the time of counterpart defaults. · Probability of default (PD) is the possibility the counterparty will default on its obligations to pay capital and/or interest. The probability of default is associated with the rating/scoring or the level of default of each counterpart/transaction. In the specific case of loan default, the assigned PD is 100%. · The loss identification period (LIP) refers to the time elapsed between the occurrence of the event that generates an incurred loss and the time that loss becomes clearly evident at the individual level. LIPs are analyzed based on loans with similar risk. · Loss given default (LGD) is the estimated loss in the event of default. It depends mainly on the characteristics of the counterparty and the valuation of the collateral associated with the transaction. The following table shows a sensitivity analysis of the most important variables affecting the calculation of the provision for loan portfolio impairment: December 31, 2017 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 447,231 (264,549 ) Loans assessed collectively: Probability of default 10 % 189,108 (261,537 ) Loss given default 10 % 219,445 (284,018 ) Loss identification period 1 month 198,259 (197,180 ) December 31, 2016 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 325,866 (191,518 ) Loans assessed collectively: Probability of default 10 % 176,162 (218,154 ) Loss given default 10 % 199,130 (234,327 ) Loss identification period 1 month 189,434 (178,529 ) December 31, 2015 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 225,292 (196,350 ) Loans assessed collectively: Probability of default 10 % 115,401 (157,465 ) Loss given default 10 % 146,631 (163,341 ) Loss identification period 1 month 87,869 (102,626 ) Deferred Income Tax: Grupo Aval periodically assesses the realization of the deferred income tax asset. The deferred tax asset represents the recoverable income taxes through future deductions from taxable income and they are recognized in the statement of financial position. The deferred tax assets are recoverable to the extent that the realization of the related tax benefits is likely. Future tax revenues and the amount of the tax benefits that are probable in the future are based on medium-term plans prepared by management. The business plan is based on management´s expectations which are believed to be reasonable under the current circumstances. Management based their financial and tax projections for each company and at the consolidated level on a project constant growth, for the following 5 years. As of December 30, 2017 and 2016 Grupo Aval’s management estimates that the deferred income tax asset would be recoverable according to the estimates of future taxable income. Deferred tax liabilities have not been recognized on taxable retained earnings from its subsidiaries in which Grupo Aval has no to repatriate in the near future, Grupo Aval controls the dividend policies of the subsidiaries and has no intent to pay out dividends or sell the related investments in the near future. See Note 19. Fair value of Biological Assets: the fair value for biological assets, which Grupo Aval owns through long term crops is determined based on appraisals prepared internally by each entity and internal experts in the development of such crops and preparation of valuation models. Due to the nature of such crops and the lack of comparable market data, the fair value of these assets is determined based on models of discounted cash flow of future net cash flows of each crop. The valuation takes into account the estimated future harvest yields, current prices of such products and the estimated future costs during development, maintenance and future harvest costs, discounted at the risk-free interest rates adjusted by risk premiums which are required in such circumstances. Note 5.3.(3) discusses the main assumptions used in the determination of the fair value of biological assets as well as a sensitivity analysis. Fair value of investment properties: Grupo Aval determines the fair value of investment properties based on appraisal reports prepared by third party independent real estate appraisers in accordance with international valuation standards on the basis of comparable prices in the local market or of net cash inflows discounted to present value using a discounted cash flow method. The valuations are made on the basis of estimated future cash flows supported by existing leases or other contracts, current market rents of similar properties in similar locations and conditions, related property operating expenses and discount rates that reflect market assessments of the uncertainty in the amount and timing of the cash flows. The best evidence to support the fair value for investment properties are the current prices in an active market for similar investment properties. Goodwill Impairment: Annually, Grupo Aval conducts an evaluation of goodwill impairment. The assessment is based on market values of stocks of banks listed in Stock Exchanges and based on studies carried out for these entities that are not quoted on the Colombia Stock Exchange. These studies are based on the valuation of the business lines that are related with goodwill, through the discounted cash flow method. The analysis takes into account factors such as: the economic situation of the country and the sector in which Grupo Aval operates, historical financial information, projected growth of revenues and costs of Grupo Aval during the next five years and subsequent perpetual growth, profits capitalization indices which are all discounted at the risk free interest rates adjusted by risk premiums which are required under the circumstances. Note 17 includes the main assumptions used in these assessments and a sensitivity analysis. Provision for contingencies : Grupo Aval evaluates and records an estimate for contingencies, in order to cover possible losses due to the labor cases, civil and commercial lawsuits, and tax objections or other issues. Provisions are recognized when the risk of loss due to contingencies based on the opinion of external legal counsel and/or in-house lawyers, is deemed to be probable and the loss can be reasonably estimated. Given the nature of many claims, cases and/or processes, in some cases, it is not possible to accurately forecast or to quantify the amount of loss in a reasonable manner. Consequently, the actual amount of disbursements effectively paid for claims, cases and/or processes may be different than the initial estimated and provisioned amounts. Such differences are recognized when they are identified. Post-employment Plan : Measurement of the pension obligation, costs and liabilities depends on a variety of long-term premises determined on actuarial bases. The assumptions for the pension obligation, include an estimate of the present value of projected future pension payments for the participants of the plan and the likelihood of potential future events, such as increases in the urban minimum wage and demographic experience. These premises may have an effect on the amount of future contributions if there are any variations. The discount rate allows for the calculation of present value of future cash flows as at the measurement date. Grupo Aval uses a long-term rate based on the market rate of high quality fixed-income investments or for government bonds denominated in Colombian Pesos, the currency in which the benefit will be paid. They also consider the opportunity and the amount of payments of future benefits, for which the Bank has selected the government bonds. Grupo Aval uses other key premises for assessing actuarial liabilities, which are calculated based on the specific experience of Grupo Aval combined with published statistics and market indicators (see Note 22, which describes the most important assumptions used in the actuarial calculations and the corresponding sensitivity analysis).

RISK MANAGEMENT

RISK MANAGEMENT	12 Months Ended
	Dec. 31, 2017
Disclosure of Risk Management [Abstract]
Disclosure of Risk Management [text block]	NOTE 4 – RISK MANAGEMENT Grupo Aval and its subsidiaries in the financial sector such as Banco de Bogotá, Banco de Occidente, Banco AV Villas, Banco Popular and Corficolombiana manage risk pursuant to the applicable regulations in each country where they operate and according to Grupo Aval’s internal policies. The risk framework requires that strong risk management practices are integrated in key strategic, capital and financial planning processes and day-to-day business processes across Grupo Aval, with a goal of ensuring risks are appropriately considered, evaluated and responded to in a timely manner. Grupo Aval employs a risk management process, referred to as identify, measure, monitor and control, as part of our daily activities, among all the risks Grupo Aval manage. Lines of Defense: In addition to the role of Executive Officers in managing risk, the Management has have clear ownership and accountability across the three lines of defense: 1) First Line of defense: Business Units, 2) Second Line of defense: mainly concentrated in the Risk Management departments and 3) Third line of defense: Corporate Audit. · Business Units: Include the business lines as well as the Technology and Operations areas, and are responsible for appropriately assessing and effectively managing all of the risks associated with their processes. · Independent Risk Management Units: Risk management areas include risk management and compliance departments. We have other control functions that are not part these areas, but are key in the risk mitigation of non-financial risks, including Legal, Human Resources and certain activities within the Financial and Administrative processes. · Corporate Audit: Corporate Audit maintain their independence from the first and second lines of defense by reporting directly to the Audit Committee or the Board. Corporate Audit provides independent assessment and validation through testing of key processes and controls across the Group The following sections outline the key risks that are inherent in business activities of our Banks and financial subsidiaries: Economic or Financial risks Credit risk: the risk of financial loss if a debtor fails to meet its contractual obligations. Market risk: the risk of loss arising from potential adverse changes in the value of the financial subsidiaries assets and liabilities or future results, resulting from changes in market variables such as interest rates, foreign exchange rates, equity prices, commodity prices, implied volatilities or credit spreads; this includes the structural interest rate and foreign exchange risks. Liquidity risk: the risk of being unable to meet contractual and contingent obligations or that the financial subsidiaries does not have the appropriate amount, composition and tenor of funding and liquidity to support its assets and liabilities requirements. Capital risk: the risk that any of the banks and financial subsidiaries have an insufficient level and composition of capital to support its business activities and associated risks during both normal economic environments and under stressed conditions. Risk related to the management of capital requirements and adequacy. Non-financial risks Operational risk: the risk of loss resulting from inadequate or failed processes or systems, human factors, or due to external events that are neither market- nor credit related such as cyber and technology related events. Conduct risk: risk derived from inappropriate practices in the dealings with customers, and the treatment of products offered to each particular customer and the adequacy thereof. Compliance and regulatory risk: risk arising from non-compliance with the legal framework, internal rules or the requirements of regulators and supervisors. Reputation risk: The risk that an action, transaction, investment or event will reduce trust in Grupo Aval integrity or competence by its various constituents, including clients, media, public opinion, counterparties, investors, regulators, employees and the broader public. Strategic risk: risk resulting from changes in Grupo Aval’s strategy or business plan due to changes in general business conditions and risk associated with strategic decisions, such as investments. Strategic risk also includes the risk of poor implementation of decisions and lack of capacity to respond to changes in the business environment. Objective and General Guidelines Grupo Aval's and its financial subsidiaries objective is to maximize returns for its investors, through proper risk management. The guiding principles of risk management of Grupo Aval are as follows: a) Make risk management a part of every institutional process. b) Collective decision making for commercial lending of significant amounts by the Board of Directors. c) Extensive and in-depth market knowledge, as a result of our leadership and our experienced, stable and seasoned senior management. d) Clear risk management policies based on a top-down approach with respect to: · Compliance with know-your-customer policies. · Commercial loans credit structure based on a clear identification of sources of repayment and of cash flow generating capacity of the borrower. e) Use of common credit analysis tools and loan pricing tools across Grupo Aval's subsidiaries. f) Diversification of the commercial loan portfolio with respect to industries and economic groups. g) Specialization in consumer product niches. h) Extensive use of continuously updated scoring models to ensure quality growth of consumer loans. i) Conservative policies in terms of: · Trading portfolio composition with bias towards lower volatility instruments. · Proprietary trading, and · The variable compensation for the trading staff. Risk Management Grupo Aval´s risk management is based on the principles indicated in the section above and they are transmitted to all banking subsidiaries and business units. The risk management strategy is supported by the following guidelines: a) In all of Grupo Aval´s banking subsidiaries the risk function is independent of the business units. The segregation of functions between the business areas and the risk areas in charge of risk acceptance, measurement analysis, control and reporting provides sufficient independence and autonomy for proper risk control. b) The decision making process at the banking subsidiaries requires that transactions of significant amounts are sent to decision centers such as risk committees. The frequency of meetings of these committees ensures a high degree of agility regarding the resolution of proposals and continuous participation of senior management for administering the different risks. c) Grupo Aval has detailed manuals and policies for risk management. The business and risk groups of Grupo Aval hold regular orientation meetings based on approaches to risk that are consistent with Grupo Aval´s risk culture. d) Grupo Aval has implemented a risk limit system that is updated on a regular basis to address new conditions in the markets and the risks to which Grupo Aval is exposed. e) There are adequate information systems to monitor risk exposure on a daily basis, to ensure compliance with limits approval and, if necessary, to implement proper corrective actions. f) Key risks are analyzed on a regular basis, and not only when risks materialize or when problems occur during the normal course of business. g) Grupo Aval offers adequate, permanent training courses on risk culture. These courses are given at every level within the organization. It also has remuneration plans for certain employees, depending on their adherence to the risk culture. h) A risk culture integrated throughout the organization, consisting on a series of attitudes, values, skills and guidelines to action. Corporate Structure of the Risk Function Governance of the risk function seeks to ensure that risk decisions are taken appropriately and efficiently and that risks are effectively controlled. The goal is to guarantee that risks are managed in accordance with the guidelines set forth by Grupo Aval. The corporate structure for risk management at the banking subsidiaries is comprised of the following, top-level risk governance bodies: · Aval Board of Directors · Risk Corporate Unit · Board of Directors · Risk committees · Risks vice-presidency · Risk management administrative processes · Internal Audit Departments Responsibility for the control and management of risk and, in particular, for the setting of Grupo Aval's risk tone rests ultimately with the Board of Directors of Grupo Aval. The Board has the powers to delegate to the various committees. The Board is supported by a comprehensive structure of risk management committees at different banks. Aval Board of Directors The Board of Directors is the body responsible for establishing the risk profile or tone, approving the general scope for risk management, monitoring its actual risk profile and ensuring consistency between them. Risk Corporate Unit Lead by Grupo Aval CRO, Grupo Aval has a corporate risk unit which main functions include among others: 1) Identification and definition of best practices for corporate risks management; 2) Support the board and the banking and financial subsidiaries in the construction of the risk appetite; 3) Identify, measure and monitoring of risks that may exceed the appetite for risk defined at the Conglomerate level.4) State and ensure the accomplishment of policies and guidelines that ensure a sound risk exposure. Board of Directors The Boards of Directors of the banking subsidiaries of Grupo Aval are responsible for adopting the following decisions, among others, with respect to the proper organization of each entity’s risk management system: · Define and approve the general policies and strategies related to the internal control system for risk management. · Approve the entity’s policies in relation to the management of different risks. · Approve trading and counterparty limits, in accordance with defined attributions. · Approve exposure limits for different types of risks. · Approve different procedures and methodologies for risk management. · Ensure the assignment of the human resources and physical and technical resources required for effective risk management. · Set forth the responsibility and attributes assigned to the different positions and areas in charge of risk management. · Create and define the functions of the committees that are needed to ensure the proper organization, control and monitoring of operations that generate risk exposure. · Approve internal control systems for risk management. · Require management of the Grupo Aval subsidiaries to submit periodic reports on the levels of exposure to several risks. · Evaluate recommendations and corrective actions proposed for risk management processes. · Require a variety of periodic reports from management on the levels of exposure to different risks. · Conduct monitoring and follow-up at regular board meetings, based on periodic risk-management reports submitted by the Audit Committee on measures taken to control or mitigate the more relevant risks. · Approve the nature and scope of the strategic business and markets in which each subsidiary will operate. Risk Committees Grupo Aval´s banks, financial companies and banking subsidiaries have, among others, committees for credit risk and treasury risk comprising members of the Board of Directors which periodically discuss, measure, control and analyze the credit risk management system (SARC for its initials in Spanish) and the market risk management systems (SARM for its initials in Spanish). The banking subsidiaries also have an asset-liability committees (ALCO) which make decisions regarding asset and liability management and evaluates de effectivemens of the liquidity risk management system (SARL for is initials in Spanish). The analysis and follow-up of the operating risk management system and the management of the business continuity plan (SARO-PCN for its initials in Spanish) are carried out by management and the Audit Committee. Compliance of legal risks is monitored by the General Secretaries of each bank. The functions of these committees include, among others, the following: · Proposing to the Board of Directors adequate policies for managing the risks that concern each committee and the applicable business processes and methodologies. · Review systematically the entity’s exposure to risks and take any corrective actions if as necessary. · Ensuring that actions of each business unit in relation to risk management are consistent with previous defined levels of risk appetite. · Approve the decisions that are within the approval limites established for each committee by the Board of Directors of the banking and financial subsidiaries. I. Integrated Risk Management Committee of the banking and financial subsidiaries The objective of these committees is to establish policies, procedures and strategies for comprehensive management with respect to credit, market, liquidity, operational, money laundering and terrorism financing risks. Its main duties involve: · Measuring the entity’s comprehensive risk profile. · Designing systems to monitor and follow up on levels of exposure to the different risks the entity faces. · Reviewing and proposing to the Board of Directors the level of tolerance and degree of exposure to risk the entity is willing to assume in the course of its business. This implies evaluating alternatives to align risk appetite in the various risk management systems. · Assessing the inherent risks involved in entering new markets, products, segments and countries, among others. II. Credit and Treasury Risk Committee of the banking and financial subsidiaries The purpose of these committees is to discuss, measure, control and analyze the credit risk and the market risk management systems (SARC and SARM for their initials in Spanish). Its primary duties involve: · Monitoring the credit and treasury risk profile to ensure the level of risk remains within established parameters, pursuant to the entities risk limits and policies. · Evaluating incursion into new markets and new products. · Assessing policies, strategies and rules of procedure in commercial activities with respect to both treasury and credit. · Ensuring that risk management and measurement methodologies are appropriate, given the characteristics and activities of the entity. III. Assets and Liabilities Committee of the banking and financial subsidiaries The objective of these committees is to support senior management by establishing risk policies, limits and systems to monitor and measure the effectiveness of the liquidity risk management systems (SARL for its initial in Spanish): · Establishing adequate procedures and mechanisms for liquidity risk management. · Monitoring liquidity risk exposure reports. · Identify the origin of risk exposure through sensitivity analysis, in order to assess the probability of lower returns for the entity or assess the necessity of new liquidity resources. IV. Audit Committee of Aval and Audit Committees of Banking and Financial Subsidiaries: The Audits Committees´s principal objective is to evaluate and monitor the Internal Control System. The following are the description of the functions for these committees: · Proposing for approval of the Board of Directors the structure, procedures and methodologies required for the operation of the Internal Control System. · Assessing the structure of the internal control of the entity, in order to establish if the procedures are designed reasonably to protect its assets, as well as those of third parties under its administration and custody. Understand if there are existing controls to verify that transactions are being properly authorized and registered. For such purpose, the areas in charge of the administration of the various systems of risk, the Statutory Auditor and the Internal Auditor submit the established periodical reports to the Committee as well as other reports that the members of the Committee may require. · Performing a follow-up of risk exposure levels taking into account the consequences for the entity and the measures adopted for their control or mitigation. Risk Vice Presidency of the banking and financial subsidiaries The Risk Vice-Presidency of the banking and financial subsidiaries have among others the following functions: 1. Oversee adequate compliance of the policies and procedures established by the Board of Directors and the various committees for risk management. 2. Designing methodologies and procedures to be followed by the administration for risk management. 3. Establishing ongoing monitoring procedures to allow timely identification of any deviation relating to compliance of the policies established for risk management. 4. Preparing timely reports for the different risk committees, the Board of Directors of each bank and for the government entities in charge of control and supervision of financial institutions in connection with compliance of risk policies. Administrative Processes of Risk Management In accordance with the respective business models, each banking subsidiary of Grupo Aval has well defined structures and procedures, including manuals on administrative processes that take into consideration the business model and risk asummed by each entity to be followed for managing different risks. The entities use the different technological tools, for the analysis, monitoring and control of the various risks. Internal Audit The Internal audit units at each bank are ran independently from the administration. In the course of performing their functions, they carry out periodic independent compliance assessments of risk management policies and procedures. Reports are submitted directly to the audit committees, which are responsible for the follow-up with the Bank’s administration regarding the corrective measures to be taken. The Corporate control function supervises the compliance of our subsidiaries with corporate policies Additionally, the corporate controller who oversees the meetings of the audit committees of the most significant subsidiaries. The units he runs performs periodic independent audits of Grupo Aval´s subsidiaries to monitor their compliance with risk management policies. His reports are presented directly to senior management at each of the subsidiaries and to the corresponding audit committees including the audit committee of the holding company. Grupo BAC Credomatic Grupo BAC Credomatic (hereinafter referred to as BAC), whose main operations are located in Central America, is consolidated as part the parent company Banco de Bogotá through its subsidiary Leasing Bogotá Panamá. BAC has its own policies, functions and risk management procedures, subject to approval by Banco de Bogotá. Risk management and periodic risk surveillance are carried out through the following bodies of corporate governance which were, established both at a regional level as well as in the countries where Grupo BAC Credomatic operates: Committee of Integral Risk Management, Committee of Assets and Liabilities (ALCO), Committee of Compliance, Credit Committee, Investment Committee and Audit Committee. Regarding credit risk management, BAC has a centralized structure, led by a Chief Risk Officer (CRO), who reports to its CEO. The Regional Credit Committee, whose members include the CEO, the CRO, and four members of the administration of Grupo Aval and Banco de Bogota, is responsible for submitting credit policies and procedures at a regional level for the Board of Directors approval. This committee is responsible for monitoring the loan portfolio. The regional credit committee is also responsible for the final decision on loans which exceed the credit limits delegated to the individual countries. While local risk managers report to the local head, observance of regional policies and procedures is reported to the CRO. With regard to market risk, BAC manages an investment policy and asset and liability policy at a regional level, setting guidelines for establishing country and counterparty risk limits, as well as limits to foreign currency positions and guidelines for liquidity risk management, interest rate and exchange rate risks. The Regional Committee of Assets and Liabilities, which is integrated by members of the Board of Directors of BAC, is responsible for the establishment of regional risk management policies. Control environment The risk management model of the banking subsidiaries has a control environment that ensures the appropriate control for all risks and provides an integrated view thereof. This control is performed at all of the business segments and for each type of risk in order to ensure that the exposures and overall risk profile are within the framework of the mandates established by both the Board of Directors and the regulators. The main elements ensuring effective control are: · The allocation of responsibilities in risk-generating functions through decision-making and due control of their activity. · Specialized control of each risk factor. · The supervision and aggregate integration of all risks. · The assessment of control mechanisms. · Independent assessment by internal audit. 4.1 Credit Risk 4.1.1 Consolidated Credit Risk Exposure Grupo Aval´s subsidiaries are exposed to credit risk, consisting of the risk of financial loss as a result of the failure of the debtor to meet its contractual obligations in financial transactions on a timely and complete manner. Exposure to credit risk for Grupo Aval and its subsidiaries is a result of credit activities and transactions with counterparties. The maximum exposure to credit risk of Grupo Aval, at a consolidated level is reflected in the carrying value of financial assets in the statement of financial position of Grupo Aval as of December 31, 2017 and 2016 as follows: Account December 31, December 31, Assets Cash and cash equivalents (**) Ps. 16,531,811 Ps. 17,294,457 Financial assets held for trading 2,650,536 2,343,902 Financial instruments available-for-sale 17,790,127 17,662,733 Financial instruments held-to-maturity 2,899,039 2,570,486 Other financial assets at fair value through profit or loss 2,282,611 2,072,674 Derivatives instruments 328,392 502,209 Hedging derivatives 55,261 128,479 Loans and receivables Commercial 99,428,894 93,149,211 Consumer 50,382,895 46,927,997 Mortgage 16,151,299 14,683,537 Microcredit 409,688 399,431 Other accounts receivable 4,466,134 3,719,672 Total financial assets with credit risk Ps. 213,376,687 Ps. 201,454,788 Financial instruments with credit risk outside of the statement of financial position at its nominal value Financial guarantees and letters of credit 3,495,921 3,510,546 Credit commitments 23,727,317 24,077,175 Total exposure to credit risk outside of the statement of financial position Ps. 27,223,238 Ps. 27,587,721 Total maximum exposure to credit risk Ps. 240,599,925 Ps. 229,042,509 (**) Not including funds in custody by the entity (cash, tellers, vaults), because there is no credit risk regarding Grupo Aval entities. For guarantees and commitments to extend the credit amounts, the maximum exposure credit risk is the amount of the commitment. Credit risk is mitigated by guarantees and collaterals as described below. 4.1.2 Mitigation of Credit Risk, Collateral and Other Credit Risk Enhancements The exposure to credit risk for each of Grupo Aval´s banking subsidiaries is reduced by collateral and other credit enhancements. The existence of guarantees can be a necessary measure but not a determinant for the approval of a credit. Credit risk policies of Grupo Aval require an evaluation of the debtor’s payment capacity based on the debtor´s ability to generate the resources needed for the timely and complete payment of its obligations. Credit risk management is organized into three different levels at the banking subsidiaries of Grupo Aval: · Analysis of credit risk: For commercial lending it is based on tools for the individual evaluation of credits based on payment capacity based on cash generation, and credit rating models based on the historical and projected financial condition and on the payment history of the debtor with the financial sector. For consumer lending (including mortgages and auto financing), scoring models are based on sociodemographic variables and payment history. · Establishment of guarantees with appropriate debt coverage in accordance with the credit policies of each bank. Guarantees include mortgages on real estate, pledge on assets, including cash deposits and investments. · Evaluation of the liquidity of the guarantees received. The methods used for the evaluation of guarantees are aligned with the market practices and include the use of independent real estate appraisers, the market value of securities or the valuation of companies issuing the securities. All guarantees must be legally evaluated and drafted following the parameters of applicable legal regulations. 4.1.2.1 Credit risk parameters At the banking subsidiaries level, the assessment of customers or transactions using rating or scoring systems constitutes a judgment of their credit quality, which is quantified through the Probability of Default (PD). In addition to customer assessment, the quantification of credit risk requires the estimation of other parameters, such as Exposure at Default (EAD) and the percentage of EAD that will not be recovered (Loss Given Default - LGD). Other relevant factors are taken into account in estimating the risk involved in transactions, such as the quantification of off-balance-sheet risk, which depends on the type of product, the Loss Identification Period (LIP) or the analysis of expected recoveries, which is related to the guarantees provided and other characteristics of the transaction such as product type, term, etc. The PD, LGD and EAD are the main credit risk parameters. Their combination is used in the calculation of the incurred loss. This loss is considered an additional cost of the activity, which is reflected in the risk premium. For all other portfolios, parameter estimates are based on Grupo Aval internal experience. The PD is calculated by observing the cases of new arrears in relation to the non-default population in a previous observation point. The LGD calculation is based on the observation of the recoveries of loans in default, taking into account not only the income and expense associated with the recovery process, but also the timing when the income and expenses take place. EAD is estimated by comparing the use of committed facilities at the time of default and their use under normal (performing) circumstances, to identify the actual use of the facilities at the time of default. As of December 31, 2017 and 2016, the following chart shows the detail of the credit portfolio per type of guarantees received as support of credits issued by Grupo Aval at a consolidated level: December 31, 2017 Commercial Consumer Mortgages Microcredit Finance Total Unsecured credits Ps. 51,074,506 Ps. 42,566,151 Ps. 6,859 Ps. 275,701 Ps. 52,179 Ps. 93,975,396 Loans secured by other banks 350,562 4,284 - - 4,803 359,649 Collateralized credits: Mortgages 865,857 62,174 15,025,672 4,811 6,127 15,964,641 Other real estate 13,126,277 1,248,808 4,290 1,168 120,909 14,501,452 Investments in equity instruments 433,041 1,077 - - - 434,118 Deposits in cash or cash equivalents 2,172,911 141,891 - 101 - 2,314,903 Leased machineries and vehicles - - - - 9,151,139 9,151,139 Fiduciary agreements, stand by letters and guarantee funds 8,129,469 36,204 64,250 102,698 364,938 8,697,559 Pledged income 3,032,277 266 22 - 11,478 3,044,043 Pledges 3,859,626 5,728,752 1,597 1,290 20,452 9,611,717 Other assets 6,491,968 366,524 843 23,919 1,434,905 8,318,159 Total gross credit portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 December 31, 2016 Commercial Consumer Mortgages Microcredit Finance Total Unsecured credits Ps. 48,506,261 Ps. 39,350,056 Ps. 3,034 Ps. 270,027 Ps. 42,964 Ps. 88,172,342 Loans secured by other banks 413,049 3,145 - - 4,779 420,973 Collateralized credits: Mortgages 811,440 59,206 13,746,499 5,388 6,391 14,628,924 Other real estate 12,317,032 1,155,760 4,365 1,373 108,571 13,587,101 Investments in equity instruments 503,141 1,779 - - - 504,920 Deposits in cash or cash equivalents 1,987,187 149,516 - - - 2,136,703 Leased machineries and vehicles - - - - 9,254,960 9,254,960 Fiduciary agreements, stand by letters and guarantee funds 7,873,687 41,526 25,818 120,771 353,179 8,414,981 Pledged income 3,066,559 451 - - 5,741 3,072,751 Pledges 5,308,416 5,570,825 1,587 1,659 4,267 10,886,754 Other assets 2,404,344 380,125 130 213 1,294,955 4,079,767 Total gross credit portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) See Note 11. 4.1.3 Policies to prevent excessive credit-risk concentration In order to prevent excessive concentrations of credit risk at an individual, economic group, country or economic sectors level, each bank of Grupo Aval maintains updated indices to limit concentration. The exposure limit by a banking subsidiary of Grupo Aval to an individual client or economic group depends on the risk profile of the client (or economic group), the nature of the risk of the debtor and the experience of each banking subsidiary in a specific market or sector. Concentration risk control is key to the risk management process. Grupo Aval´s banking subsidiaries continually monitors the degree of credit risk concentration by sector and customer group. In order to avoid credit risk concentration at Grupo Aval level, management relies on the banking subsidiaries Risk Vice-Presidency, which consolidates, and monitors the credit risk exposures of all banks, to determine the maximum levels of concentration. Pursuant to Colombian regulations, banks in Colombia cannot grant unsecured loans to borrowers, which on a combined basis exceed 10% of the bank´s regulatory capital calculated according to the regulations of the Superintendency of Finance. Loans maybe more than 10% of the regulatory capital of the bank when they are secured by acceptable guarantees. The detail of credit risk at the level of Grupo Aval in the different geographic areas determined according to the domicile of the debtor, without taking into consideration loan loss provisions as of December 31, 2017 and 2016 is as follows. December 31, 2017 Commercial Consumer Mortgages Microcredit Finance Leases (1) Total Colombia Ps. 61,960,497 Ps. 32,878,650 Ps. 5,674,640 Ps. 409,688 Ps. 10,289,156 Ps. 111,212,631 Panamá 4,877,646 4,852,539 2,154,504 - 121,838 12,006,527 United States 6,433,333 736 10 - - 6,434,079 Costa Rica 3,833,906 4,848,689 3,868,474 - 712,686 13,263,755 Nicaragua 2,228,138 1,307,042 403,191 - 6,052 3,944,423 Honduras 2,794,260 1,736,449 740,113 - 3,251 5,274,073 El Salvador 1,746,193 2,267,152 897,404 - 9,747 4,920,496 Guatemala 4,807,329 2,264,791 1,365,197 - 24,200 8,461,517 Other countries 855,192 83 - - - 855,275 Total gross credit portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 (1) See Note 11. December 31, 2016 Commercial Consumer Mortgages Microcredit Finance Leases (1) Total Colombia Ps. 58,561,329 Ps. 30,523,917 Ps. 4,822,806 Ps. 399,431 Ps. 10,244,275 Ps. 104,551,758 Panamá 4,839,734 4,650,419 2,067,375 - 127,976 11,685,504 United States 5,186,307 436 16 - - 5,186,759 Costa Rica 3,329,869 4,390,441 3,674,158 - 665,281 12,059,749 Nicaragua 2,148,814 1,237,205 390,003 - 7,164 3,783,186 Honduras 2,292,105 1,597,280 720,987 - 3,867 4,614,239 El Salvador 1,499,044 2,076,588 873,870 - 11,977 4,461,479 Guatemala 4,455,244 2,080,065 1,232,218 - 15,267 7,782,794 Other countries 878,670 156,038 - - - 1,034,708 Total gross credit portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) See Note 11. Below is the credit portfolio distribution of Grupo Aval by economic sector as of December 31, 2017 and 2016: Sector December 31, 2017 % December 31, 2016 % Agricultural Ps. 3,940,981 2 % Ps. 3,734,625 2 % Mining products and oil 2,377,188 1 % 2,018,219 1 % Food, beverage and tobacco 8,165,975 5 % 7,273,602 5 % Chemical production 5,672,310 3 % 5,276,248 4 % Other industrial and manufacturing products 4,469,427 3 % 4,576,173 3 % Government 3,579,838 2 % 3,629,849 2 % Construction 10,313,655 7 % 9,959,536 7 % Trade and tourism 2,182,437 1 % 2,025,206 1 % Transportation and communications 7,566,374 5 % 7,814,741 5 % Public services 5,421,328 3 % 5,160,77

ESTIMATION OF FAIR VALUE

ESTIMATION OF FAIR VALUE	12 Months Ended
	Dec. 31, 2017
Disclosure Of Estimations of Fair Value [Abstract]
Disclosure of fair value measurement [text block]	NOTE 5 – ESTIMATION OF FAIR VALUE The fair value of the financial assets and liabilities traded in active markets (such as financial assets in debt securities, equity securities and derivatives actively listed in stock exchanges or interbank markets) is based on dirty prices supplied by a price vendor. An active market is a market wherein transactions for assets or liabilities are carried out with sufficient frequency and volume in order to provide price Grupo Aval may use models developed internally for financial instruments with no active markets. These models are usually based on valuation techniques and methods generally standardized in the financial sector. The valuation models are mainly used for appraising financial equity instruments not listed on the stock exchange, debt certificates and other debt instruments for which the markets were or have been inactive during the financial period. Some inputs of these models may not be observable in the market and are therefore estimated based on assumptions. The output of a model is always an estimate or approximation of a value that cannot be determined with certainty, and the valuation techniques used may not fully reflect all the factors relevant to the positions of Grupo Aval. Therefore, the appraisals are adjusted, if necessary, to allow for additional factors, including country risk, liquidity risks and counterparty risks. The fair value hierarchy has the following levels: · Level 1 inputs are quoted prices (unadjusted) in active markets for assets or liabilities identical to those which the entity can access as of the date of measurement. · Level 2 inputs are inputs different than quoted prices included in Level 1 that are observable for the asset or liability, whether directly or indirectly in non-active markets. · Level 3 inputs are unobservable inputs for the asset or liability. The level in the fair value hierarchy within which fair value measurement is classified in whole is determined based on the input of the lowest level that is most significant for measuring its total fair value. For such purpose, the relevance of an input is assessed in connection with the measurement of the total fair value. Financial instruments that are listed in markets that are not deemed active, but which are valued based in accordance with quoted market prices, quotes from price vendors or alternative price sources supported by observable inputs, are classified in Level 2. If a fair value measurement uses observable inputs that require significant adjustments based on unobservable inputs, this measurement is classified as Level 3. The assessment of the importance of a particular input to the measurement of fair value in whole requires judgment, taking into account specific factors of the asset or liability. Determining what is deemed as 'observable' requires a significant judgment by Grupo Aval. Grupo Aval considers as observable data the market data which is already available, distributed or updated by the price suppliers, and it is reliable and verifiable, with no property rights, and provided by independent sources which are actively involved in the reference market. 5.1 Measurements of Fair Value on a Recurring Basis Measurements of fair value on a recurring basis are those required or allowed in statement of financial position at the end of each accounting period. The following table presents an analysis, within the hierarchy of fair value, of Grupo Aval´s assets and liabilities (by class), measured at fair value as of December 31, 2017 and 2016 on a recurring basis. December 31, 2017 Level 1 Level 2 Level 3 Total Assets Held for trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 1,104,829 Ps. 124,777 Ps. - Ps. 1,229,606 Securities issued or secured by other entities of the Colombian Government - 48,355 - 48,355 Securities issued or secured by other financial entities - 833,860 - 833,860 Securities issued or secured by entities of the Non-financial sector - 17,869 - 17,869 Other - 37,442 12,975 50,417 In Foreign Currency Securities issued or secured by Colombian Government - 1,613 - 1,613 Securities issued or secured by other entities of the Colombian Government - 21,709 - 21,709 Securities issued or secured by foreign Governments - 92,931 - 92,931 Securities issued or secured by central banks - 34,095 - 34,095 Securities issued or secured by other financial entities - 303,665 - 303,665 Other - 16,416 - 16,416 Total held for trading debt securities Ps. 1,104,829 Ps. 1,532,732 Ps. 12,975 Ps. 2,650,536 Investments in debt securities available-for-sale In Colombian Pesos Securities issued or secured by the Colombian Government 7,668,545 224,009 - 7,892,554 Securities issued or secured by other entities of the Colombian Government - 92,008 - 92,008 Securities issued or secured by other financial entities - 263,633 - 263,633 Securities issued or secured by entities of the Non-financial sector - 2,326 - 2,326 Other - 563 6,627 7,190 In Foreign Currency Securities issued or secured by Colombian Government - 1,592,371 - 1,592,371 Securities issued or secured by other entities of the Colombian Government - 570,694 - 570,694 Securities issued or secured by foreign Governments 29,604 2,074,793 - 2,104,397 Securities issued or secured by central banks - 1,356,874 - 1,356,874 Securities issued or secured by other financial entities 456,354 2,898,090 - 3,354,444 Securities issued or secured by entities of the Non-financial sector - 322,143 - 322,143 Other - 231,493 - 231,493 Total investments in debt securities available-for sale Ps. 8,154,503 Ps. 9,628,997 Ps. 6,627 Ps. 17,790,127 Total investments in debt securities Ps. 9,259,332 Ps. 11,161,729 Ps. 19,602 Ps. 20,440,663 Equity securities Trading equity securities 28,659 2,095,160 25,341 2,149,160 Investments in equity securities available-for-sale 768,336 55,697 - 824,033 Total equity securities Ps. 796,995 Ps. 2,150,857 Ps. 25,341 Ps. 2,973,193 Held for trading Derivatives Currency Forward - 222,377 1,578 223,955 Bond Forward - 731 - 731 Interest Rate Swap - 52,970 - 52,970 Currency Swap - 33,104 - 33,104 Currency Options 17,632 - 17,632 Total held for trading derivatives Ps. - Ps. 326,814 Ps. 1,578 Ps. 328,392 Hedging Derivatives Currency Forward - 55,261 - 55,261 Total hedging derivatives Ps. - Ps. 55,261 Ps. - Ps. 55,261 Other financial assets at fair value through profit or loss Financial assets in concession contracts - - 2,282,611 2,282,611 Total financial assets designated at fair value Ps. 10,056,327 Ps. 13,694,661 Ps. 2,329,132 Ps. 26,080,120 Non- financial assets Biological assets - - 66,139 66,139 Investment properties - - 783,794 783,794 Total non- financial assets Ps. - Ps. - Ps. 849,933 Ps. 849,933 Total assets at fair value on recurring basis Ps. 10,056,327 Ps. 13,694,661 Ps. 3,179,065 Ps. 26,930,053 Liabilities Trading Derivatives Currency Forward - 142,760 1,812 144,572 Bond Forward - 1,107 - 1,107 Interest Rate Swap - 40,693 - 40,693 Currency Swap - 79,263 - 79,263 Currency Options - 33,030 - 33,030 Total trading derivatives Ps. Ps. 296,853 Ps. 1,812 Ps. 298,665 Hedging Derivatives Currency Forward - Ps. 13,464 Ps. - Ps. 13,464 Total hedging derivatives Ps. - 13,464 - 13,464 Total liabilities at fair value on recurring basis Ps. - Ps. 310,317 Ps. 1,812 Ps. 312,129 December 31, 2016 Level 1 Level 2 Level 3 Total Assets Held for trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 887,218 Ps. 78,521 Ps. - Ps. 965,739 Securities issued or secured by other entities of the Colombian Government - 38,400 - 38,400 Securities issued or secured by other financial entities - 737,884 - 737,884 Securities issued or secured by entities of the Non-financial sector - 18,657 - 18,657 Other - 54,085 12,210 66,295 In Foreign Currency Securities issued or secured by Colombian Government - 19,716 - 19,716 Securities issued or secured by other entities of the Colombian Government 330 20,747 - 21,077 Securities issued or secured by foreign Governments - 88,095 - 88,095 Securities issued or secured by central banks - 74,727 - 74,727 Securities issued or secured by other financial entities - 313,129 - 313,129 Other - 183 - 183 Total held for trading debt securities Ps. 887,548 Ps. 1,444,144 Ps. 12,210 Ps. 2,343,902 Investments in debt securities available-for-sale In Colombian Pesos Securities issued or secured by the Colombian Government 8,281,946 922,232 - 9,204,178 Securities issued or secured by other entities of the Colombian Government - 79,435 - 79,435 Securities issued or secured by other financial entities - 120,795 - 120,795 Securities issued or secured by entities of the Non-financial sector - 17,923 - 17,923 Other - 685 15,167 15,852 In Foreign Currency Securities issued or secured by Colombian Government - 1,371,029 - 1,371,029 Securities issued or secured by other entities of the Colombian Government 22,550 467,327 - 489,877 Securities issued or secured by foreign Governments - 2,083,345 - 2,083,345 Securities issued or secured by central banks - 538,731 - 538,731 Securities issued or secured by other financial entities 375,798 2,580,127 - 2,955,925 Securities issued or secured by entities of the Non-financial sector 80,638 500,152 - 580,790 Other - 204,853 - 204,853 Total investments in debt securities available-for-sale Ps. 8,760,932 Ps. 8,886,634 Ps. 15,167 Ps. 17,662,733 Total investments in debt securities Ps. 9,648,480 Ps. 10,330,778 Ps. 27,377 Ps. 20,006,635 Equity securities Trading equity securities 3,233 1,744,381 - 1,747,614 Investments in equity securities available-for-sale 655,096 74,683 - 729,779 Total equity securities Ps. 658,329 Ps. 1,819,064 Ps. - Ps. 2,477,393 Held for trading Derivatives Currency Forward - 391,370 - 391,370 Interest Rate Swap - 39,780 - 39,780 Currency Swap - 44,594 - 44,594 Currency Options - 26,313 - 26,313 Interest Rate Options - 152 - 152 Total held for trading derivatives Ps. - Ps. 502,209 Ps. - Ps. 502,209 Hedging Derivatives Currency Forward - 128,479 - 128,479 Total hedging derivatives Ps. - Ps. 128,479 Ps. - Ps. 128,479 Other financial assets designated at fair value through profit or loss Financial assets in concession contracts - - 2,072,674 2,072,674 Total financial assets designated at fair value Ps. - Ps. - Ps. 2,072,674 Ps. 2,072,674 Non- financial assets Biological assets - - 48,002 48,002 Investment properties - - 610,188 610,188 Total non- financial assets Ps. - Ps. - Ps. 658,190 Ps. 658,190 Total assets at fair value on recurring basis Ps. 10,306,809 Ps. 12,780,530 Ps. 2,758,241 Ps. 25,845,580 Liabilities Trading Derivatives Currency Forward - 408,903 - 408,903 Securities Forward - 1,492 - 1,492 Interest Rate Swap - 25,827 - 25,827 Currency Swap - 164,906 - 164,906 Currency Options - 39,567 - 39,567 Total trading derivatives Ps. - Ps. 640,695 Ps. - Ps. 640,695 Hedging Derivatives Currency Forward - 43,436 - 43,436 Total hedging derivatives Ps. - Ps. 43,436 Ps. - Ps. 43,436 Total liabilities at fair value on recurring basis Ps. - Ps. 684,131 Ps. - Ps. 684,131 5.2 Items Measurements at Fair Value on a Non-recurring Basis Grupo Aval is required, on a nonrecurring basis to adjust the carrying value of certain assets and liabilities or provide valuation allowances. These assets or liabilities primarily include impaired collateralized loans and non-current assets held for sale. The fair value of these assets which are classified as Level 3 are determined using pricing models, discounted cash flow methodologies, a current replacement cost or similar techniques, using internal models or external experts with sufficient experience and knowledge of the real estate market or of assets being appraised. Generally, these appraisals are carried out by references to market data or based on the replacement cost, when sufficient market data is not available. The following table present Grupo Aval’s assets and liabilities, classified within the fair value hierarchy, which are measured on a nonrecurring basis as of December 31, 2017 and 2016 at fair value less cost of sale: December 31, 2017 Level 1 Level 2 Level 3 Total Impaired collateralized loans Ps. - Ps. - Ps. 701,948 Ps. 701,948 Non- current assets held for sale - - 101,382 101,382 Ps. - Ps. - Ps. 803,330 Ps. 803,330 December 31, 2016 Level 1 Level 2 Level 3 Total Impaired collateralized loans Ps. - Ps. - Ps. 657,080 Ps. 657,080 Non- current assets held for sale - - 259,528 259,528 Ps. - Ps. - Ps. 916,608 Ps. 916,608 5.3 Fair Value determination Level 1 financial instruments are those traded in an active market. Their fair value was established according to quoted prices (unadjusted) supplied by the price vendor, which are determined using the weighted averages of transactions carried out during the trading day. Level 2 financial instruments as those traded in non-active market, the following table provides information about valuation techniques and significant inputs when measuring assets and liabilities. Valuation technique Significant inputs (1) ASSETS Investments in debt securities at fair value through profit or loss In Colombian Pesos Securities issued or secured by the Colombian Government Discounted cash flow Estimated Prices (2) Securities issued or secured by Colombian government entities Discounted cash flow Estimated Prices (2) Securities issued or secured by other financial entities Discounted cash flow Estimated Prices (2) Yield and Margin Securities issued or secured by non-financial sector entities Discounted cash flow Estimated Prices (2) Other Discounted cash flow Estimated Prices (2) Yield and Margin Valuation technique Significant inputs (1) In Foreign Currency Securities issued or secured by the Colombian Government Market Price Quoted Prices Estimated Prices (2) Securities issued or secured by Colombian government entities Discounted cash flow Estimated Prices (2) Securities issued or secured by foreign governments - - - - - Securities issued or secured by Central Banks - - - - Securities issued or secured by other financial entities - - - - - - Securities issued or secured by non-financial sector entities - Market Price - - - Other - - - - - - Equity securities Corporate Stock Market Price Estimated Prices (2) Investment Funds Market Price Market value of underlying assets, less management and administrative fees Pension and severance funds (3) Market Price Market value of underlying assets, less management and administrative fees Trading Derivatives Foreign Currency Forward - Underlying asset price Debt securities Forward - Currency curve by underlying asset Interest rate Swap Discounted cash flow - Forward Exchange rates curve of the operation’s currency Cross Currency Swap - Implicit curves of Exchange rates forwards Swap (others) - Swap curves by underlying asset Currency Options - Implicit volatilities matrixes and curves Hedging Derivatives Currency Forward Discounted cash flow Curves by currency LIABILITIES Derivatives held for trading Foreign Currency Forward - Underlying asset price Debt securities Forward - Currency curve by underlying asset Interest rate Swap Discounted cash flow - Forward Exchange rates curve of the operation’s currency Currency Swap - Implicit curves of exchange rates forwards Swap (others) - Swap curves by underlying asset Currency Options - Implicit volatilities matrixes and curves Hedging Derivatives Foreign Currency Forward - Underlying asset price Interest rate Forward - Currency curve by underlying asset Discounted cash flow - Forward Exchange rates curve of the operation’s currency Interest rate Swap - Implicit curves of Exchange rates forwards - Swap curves by underlying asset - Implicit volatilities matrixes and curves (1) Supplied by the price vendor (2) Estimated Price: A valuation model is made by the price vendor when it is not able to supply quoted prices (unadjusted) for each security. This model is the basis for the construction of the valuation margin of the securities that is represented on the assigned curve or reference rate. This margin remains constant on the assigned curve or reference rate when calculating the theoretical valuation price. (3) The subsidiary Porvenir S. A. according to Colombian rules is required to invest to 1% of its total assets under management from severance and mandatory pension funds. The following table provides information about valuation techniques and significant unobservable inputs when measuring Level 3 assets and liabilities at recurring fair value. Valuation technique Significant inputs ASSETS Investments in debt securities at fair value through profit or loss In Colombian Pesos Other Discounted cash flow Projected payments flow of mortgage securitizations (1) Other financial assets Assets under concession contracts Discounted cash flow - Free-cash flow from concession contracts - Concession contract’s maturity period - Perpetuity value of the year “n” free-cash flow - Present value of the discounted residual value at WACC. - Financial income: annual adjustment of the financial asset’s value. The detail of valuation process for financial assets in concession arrangements are outlined in (2) Non-financial assets Biological assets Discounted cash flow The processes used to collect data and determine the fair value of biological assets are described in (3). Investment properties Discounted cash flow The processes used to collect data and determine the fair value of biological assets are described in (4) (1) Mortgage-Backed Securities Titularizadora Colombiana S.A issued mortgage securitizations. Following is the valuation under 3 scenarios, these scenarios are based on projections that, consider different prepayment and delinquency assumptions. The following table shows the sensitivity analysis of this fair value under three different scenarios. December 2017 Baseline scenario (i) Favorable scenario (ii) Unfavorable scenario (iii) Ps. 19,602 Ps. 80 Ps. (95 ) December 2016 Baseline scenario (i) Favorable scenario (ii) Unfavorable scenario (iii) Ps. 27,377 Ps. 302 Ps. (343 ) (i) Fair value as of December 31, 2017 and 2016 calculated based on valuation scenario, considers 12-month Moving Average Prepayment between 12.4% and 15.8% and 12.3% and 16.0% respectively, and 1 Time Delinquency Curve. (ii) Pre-payment of 10% and 1 time delinquency curve (iii) Pre-payment of 20% and 1 time delinquency curve (2) Financial assets under concession contracts Promigas and subsidiaries designated some of their financial assets under concession contracts at fair value; the discounted cash flows method of was used to determine their fair value. The assumptions for the calculation of the financial assets were: · Financial assets were calculated taking into account the expiration date of each concession contract. · The calculation was carried out in proportion to the expiration of each of the concession contracts in force. · Only the operational cash flows of these assets under concession were taken into account. The components of the calculations are as follows: · Free cash flow generated solely by assets under concession. · Expiration period of the concession. · Amount in-perpetuity of the Free Cash Flow (FCF) of the year, estimated factoring a growth in the residual amount between 3% and 1% for 2017 and 2016, each. · Current amount of the residual amount Weighted Average Cost of Capital (WACC), estimated taking into account an interest rate between 9.20 % and 8.42% each year. · Financial Income: Annual adjustment of the amount of the financial asset to WACC (*). (*) Nominal WACC calculated under the Capital Asset Pricing Model (CAPM) methodology for each concession contract, updated annually. The following variables were used for determining the WACC: · Beta Unlevered USA (Oil/Gas Distribution): Damodaran. [Betaunlevered 0.69, in 2016] · Risk Free Rate, Source: Geometric Average 10 years of American bonds “T-Bonds”. · Marker Return, Source: Geometric Average 10 years Damodaran “Stocks” USA. · Market Premium: Market Return – Risk Free Rate · Country Risk Premium: Average last 5 years EMBI (Difference between 10 year Colombian sovereign bonds and 10 year “T-Bonds”). Damodaran · Emerging Market: Equity Premium Emerging countries (Lambda - Damodaran) Sensitivity analysis The following table includes a sensitivity analysis of the assumptions used by Promigas and its subsidiaries in the calculation of fair value of unconditional transfer rights of gas pipelines to Government entities at the expiration date of the contracts. The fair value of the financial asset at December 31, 2017 is Ps. 2,282,611 and Ps. 2,072,674 at December 31, 2016. December 31, 2017 December 31, 2016 Variable +100 bps -100 bps +100 bps -100 bps WACC Ps. (608,164 ) Ps. 949,005 Ps. (534,128 ) Ps. 810,001 Growth rate 520,052 (362,867 ) 434,225 (293,491 ) (3) Biological Assets Fair value of Grupo Aval subsidiaries’ “biological assets”, which correspond to agricultural activities related to biological assets (animals or plants), is estimated based on internal reports prepared by the companies who own such assets. Fair value of biological assets is determined using valuations performed by experienced internal professionals, using discounted cash flow models. Since no comparable market exist for the biological assets, given their nature, their fair value is determined using discounted cash flows models for each biological asset, based on estimated future quantities of crops, prices, harvesting costs, and maintenance and crop yields, among others, discounted using a risk-free rate adjusted by an appropriate risk premium. See note 15. The main assumptions used for determining the fair value of the principal biological assets are as follows: 1. Biological assets growing in rubber crops: The price of natural rubber was forecasted based on the average of the last 3 years of the Technically Specified Rubber (TSR20) per ton since December, 2015 and averaged with the future prices of the next 3 months Ps. 4.6 (USD $1,542.8) as of December 31, 2017, Ps. 5.5 (USD $1,816.6) as of December 31, 2016 and Ps. 6.7 (USD$2,136) as of December 31, 2015, in order to reflect the behavior of the commodity for an entire economic cycle. Forecasted prices are adjusted annually based on the expected US inflation rate. Yield per hectare: Based on the crop composition and the planting year of the different clones, we forecasted a stepwise yield per hectare starting in year 7 after plantation and stabilizing after year 10. Year Tons of rubber per Year 7 0.60 Year 8 0.90 Year 9 1.40 Year 10 and other 1.80 Costs and administrative expenses: Costs are forecasted considering the different activities incurred during the life of a rubber project. A cost per hectare is forecasted for every key activity such as crop establishment, maintenance of immature plant and maintenance and harvest of mature plants. Discount rate: Based on the data for the “Farming/Agriculture” 2. Biological assets growing in African palm crops: The price of African palm Ps. 1.9 (USD $650.58) per ton as of December 31, 2017 and Ps. 1.8 (USD $606.20) per ton as of December 31, 2016 was forecasted based on the average price of palm oil since 2015, in order to reflect the behavior of the commodity for an entire economic cycle. Forecasted prices are adjusted annually with the expected US inflation rate. The source of information for international prices for Colombia’s market are the following: a. Crude palm oil: BURSA MALAYSIA DERIVATIVES (BMD) – Crude Palm Oil Futures (FCPO) – Third Position. It is a relevant international market prices, of easy public access, and is provided by transparent and objective source. b. For the price forecast, available future prices (FCPO) were also used. Yield per hectare: Based on the crop composition and the re-planting year of the crops, which started in 2006, we forecasted a stepwise yield per hectare for each plantation as follows: Year Tons of fresh fruit 0 to 3 - 4 4.25 5 9.91 6 11.73 7 21.58 8 to 25 21.80 More than 25 36.10 Extraction rate: The oil extraction rate (OER) is a factor that defines the amount of crude palm oil that is produced. The OER varies depending on the age of the plantation, and was forecasted based on the following table: Year Extraction Rate 0 to 3 19 4 23 5 23 6 23 7 23 8 to 25 23 More than 25 21 Weighted average 22.14 Costs and administrative expenses: Costs are forecasted considering the different activities that are incurred during the life of an African palm crop. A cost per hectare is forecasted for every key activity such as crop establishment, maintenance and exploitation, harvest and transport. Discount rate: Based on the data for the “Farming/Agriculture” Sensitivity analysis of Biological Assets at fair value As a result of its investment in Corficolombiana, Grupo Aval´s assets include certain biological assets, that consist primarily of African palm oil and rubber. Grupo Aval does not produce African palm oil from Malaysia, or sells its product in the Rotterdam market. However, Grupo Aval has knowledge that the price of African palm oil and rubber is highly correlated to trade at both markets. If the average price of technically specified rubber (TSR20) and crude palm oil (CPO) had been 5% higher or lower in 2017 and 2016, with all the other variables remaining constant and excluding the effect of hedging activities, Grupo Aval’s profits for the period, before taxes, would have been the following, including only the product growing on bearer plants. Rubber Plantations TSR20 reference price Change in fiscal year- Value of the biological Effect on profits 1,620 5 % 25,366 10.762 Dec-17 1,543 - 24,158 9.554 1,466 (5 )% 22,950 8.346 1,907 5 % 15,628 9.888 Dec-16 1,817 - 14,606 8.899 1,726 (5 )% 13,584 7.910 African Palm Plantations CPO reference price Change in fiscal year- Value of the biological Effect on profits 683 5 % 27,883 5.068 Dec-17 651 - 26,555 3.740 618 (5 )% 25,228 2.412 637 5 % 23,109 5.495 Dec-16 606 - 21,597 5.354 576 (5 )% 20,085 3.213 The fair value of biological assets is also affected by different circumstances in the market such as climate, natural disasters and plagues. The subsidiaries that manage biological assets have taken all the necessary precautions to reduce these risks. (4) Investment properties Investment properties are recognized at fair value, based on a valuation made at each year-end period, using an independent expert appraisal. While in Colombia, the frequency of transactions in the real state sector is low compared to other more developed markets, management believes there are enough references to assess the fair value of investment properties owned by Grupo Aval and its subsidiaries based on comparable market transactions. Fire-sales are excluded from the comparable transactions used to estimate the fair-value of investment properties. Management has reviewed the main assumptions used by the independent external appraisers (such as inflation, interest rates, etc.) and believes they are consistent with market conditions at each end of period. However, management believes that the estimation of the fair value of investment properties depends on significant judgement from the independent expert appraisers, and as such, there could be a significant probability that the actual price of sale of a property differs from its fair value. 5.4 Transfers between level 1 and level 2 of the fair value hierarchy The following table summarizes the transfer between fair value levels 1 and 2 during 2017 and 2016. In general, transfers between Level 1 and Level 2 in the investment portfolios are due, fundamentally, to changes in the liquidity levels of the securities in the markets. December 31, 2017 December 31, 2016 Transfers between: Transfers between: Level 2 to Level 1 Level 2 to Level 1 to Trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. - Ps. 28,153 Ps. 963,794 Ps. 208,526 Securities issued or secured by other financial entities - - - - Ps. - Ps. 28,153 Ps. 963,794 Ps. 208,526 In Foreign Currency Securities issued or secured by other entities of the Colombian Government Ps. - Ps. 10,221 Ps. - Ps. - Securities issued or secured by foreign Governments - - - - Securities issued or secured by central banks - - - - Securities issued or secured by other financial entities - 65,209 - 1,547 Securities issued or secured by entities of the Non-financial sector - 85,552 - - Other - - - - Ps. - Ps. 160,982 Ps. - Ps. 1,547 Ps. - Ps. 189,135 Ps. 963,794 Ps. 210,073 There were no transfers of fair values between levels and 2 to or from level 3. 5.5 Reconciliation Level 3 of the fair value hierarchy The reconciliation of the balances at the begining of the period to the closing balances with the fair value measurements classified at Level 3 is shows in the following table. Financial assets Equity Financial assets in Biological Investment January 1, 2015 Ps. 36,821 Ps. - Ps. 1,738,598 Ps. 202,399 Ps. 366,742 Valuation adjustment with an effect on income 2,892 - 153,094 22,922 104,769 Valuation adjustments with an effect on OCI (3,636 ) - - - - Additions - - - 35,265 89,679 Sales/disposals - - - (20,374 ) (22,944 ) December 31, 2015 Ps. 36,077 Ps. - Ps. 1,891,692 Ps. 240,212 Ps. 538,246 Valuation adjustment with an effect on income 750 - 180,982 14,644 53,680 Valuation adjustments with an effect on OCI (9,450 ) - - - - Reclassification of bearer plants balance - - - (188,177 ) - Effects of amendments in accounting policies of bearer plants. - - - (18,108 ) - Transfers to non-current assets held for sale - - - - 11,319 Reclassification - - - (1,331 ) (2,539 ) Additions - - - 21,432 71,268 Sales/disposals Ps. - Ps. - Ps. - Ps. (20,670 ) Ps. (61,786 ) December 31, 2016 Ps. 27,377 Ps. - Ps. 2,072,674 Ps. 48,002 Ps. 610,188 Valuation adjustment with an effect on income 765 - 209,937 13,503 46,675 Valuation adjustments with an effect on OCI (8,540 ) - - - - Transfers from non-current assets held for sale - - - - 101,469 Reclassification - 25,341 - - (30,143 ) Additions - - - 24,409 84,036 Sales/disposals Ps. - Ps. - Ps. - Ps. (19,775 ) Ps. (28,431 ) December 31, 2017 Ps. 19,602 Ps. 25,341 Ps. 2,282,611 Ps. 66,139 Ps. 783,794 5.6 Fair Value of Financial Assets and Liabilities recognized at Amortized Cost The following table shows a summary of financial assets and liabilities accounted at amortized cost and valued at fair value, as of December 31, 2017 and 2016 only for disclosure purposes. December 31, 2017 December 31, 2016 Carrying Fair Value Carrying Fair Value Assets Investments in fixed income held-to-maturity (1) Ps. 2,899,039 Ps. 2,928,929 Ps. 2,570,486 Ps. 2,558,333 Credit portfolio at amortized cost (2) 160,754,295 166,303,676 150,898,732 159,917,633 Total financial assets Ps. 163,653,334 Ps. 169,232,605 Ps. 153,469,218 Ps. 162,475,966 Liabilities Customer deposits (3) Ps. 154,885,224 Ps. 154,805,726 Ps. 143,887,055 Ps. 146,778,588 Financial Liabilities (4) 45,276,036 45,413,210 45,516,281 46,545,065 Total financial Liabilities Ps. 200,161,260 Ps. 200,218,936 Ps. 189,403,336 Ps. 193,323,653 (1) Financial assets held-to-maturity Fair value of fixed income investments at amortized cost was determined using the dirty price given by the price supplier, securities in an active market and with a market price for the day of the valuation are classified as level 1, securities with no active market and/or with an estimated price (present value of the flows of a security, discounted with the reference rate and the corresponding margin) given by the supplier are classified as level 2. (2) Credit portfolio at amortized cost For credit portfolio at amortized cost it fair value was determined using discounted of cash flows models at the interest rates offered by banks for granting new loans, taking into account the credit risk and its maturity; the process of valuation is deemed as level 3. Accounts receivables and payables are classified as short-term assets and liabilities; in consequence, their fair value are similar to their book value. (3) Customer deposits The fair value of demand deposits is equal to their carrying value. For fixed-term deposits with maturities of less than 180 days, its fair value is deemed equal to its carrying value. For fixed-term deposits with maturities of more than 180 days, its fair value was estimated using the carrying discounted cash flow models to the interest rates offered by banks in accordance with their maturity. This is considered this as a level 2 valuation. (4) Financial liabilities For financial liabilities and other short-term liabilities, the carrying value was considered similar to its fair value. The fair value o

CASH AND CASH EQUIVALENTS

CASH AND CASH EQUIVALENTS	12 Months Ended
	Dec. 31, 2017
Disclosure of cash and cash equivalents [Abstract]
Disclosure of cash and cash equivalents [text block]	NOTE 6 – CASH AND CASH EQUIVALENTS Balances of cash and cash equivalents comprise the following as of December 31, 2017 and 2016: December 31, December 31, In Colombian Pesos Cash Ps. 4,100,166 Ps. 3,476,270 In the Colombian Central Bank 3,820,539 3,598,125 Demand deposits in banks and other financial entities 312,661 380,610 Clearing 1,733 2,435 Investments in debt securities maturing in under three months 28,603 41,064 Restricted cash (1) 366,584 41 Ps. 8,630,286 Ps. 7,498,545 In foreign currency Cash 1,704,861 1,422,278 Demand deposits in banks and other financial entities 11,999,859 13,268,996 Restricted cash (2) 1,832 3,185 Ps. 13,706,552 Ps. 14,694,459 Total cash and cash equivalents Ps. 22,336,838 Ps. 22,193,004 (1) Grupo Aval has restricted cash related to the collection of tolls on concessions and banking reserve. The increase presented is mainly attributable to the business combination of Concesionaria Vial del Pacífico S.A.S. Ps. 89,491 and Concesionaria Nueva Vía al Mar S.A.S. Ps. 119,524 (Grupo Aval considers this acquisition non-significant ) and restricted cash related to unpaid pension balances at Industrial Lehner Ps. 67,777. (2) Grupo Aval has restricted cash related to deposits in guarantee for Banco Corficolombiana Panama S.A and Gas Comprimido del Peru S.A. Grupo Aval´s banking subsidiaries had cash reserves to comply with the mandatory amount for time deposits, checking account and savings accounts for Ps. 7,679,587 and Ps. 7,151,365 at December 31, 2017 and 2016, respectively.

DEBT AND EQUITY SECURITIES HELD

DEBT AND EQUITY SECURITIES HELD-FOR-TRADING	12 Months Ended
	Dec. 31, 2017
Disclosure of financial assets held for trading through profit or losses [Abstract]
Disclosure of financial instruments at fair value through profit or loss [text block]	NOTE 7 – DEBT AND EQUITY SECURITIES HELD-FOR-TRADING The balance of debt and equity securities held for trading comprises the following as of December 31, 2017 and 2016: December 31, December 31, Debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 1,229,606 Ps. 965,739 Securities issued or secured by other Colombian Government entities 48,355 38,400 Securities issued or secured by other financial entities 833,860 737,884 Securities issued or secured by Non-financial sector entities 17,869 18,657 Others 50,417 66,296 Ps. 2,180,107 Ps. 1,826,976 In foreign currency Securities issued or secured by Colombian Government 1,613 19,716 Securities issued or secured by other Colombian Government entities 21,709 21,076 Securities issued or secured by Foreign Governments 92,931 88,095 Securities issued or secured by Central Banks 34,095 74,727 Securities issued or secured by other financial entities 303,665 313,129 Others 16,416 183 Ps. 470,429 Ps. 516,926 Total trading debt securities Ps. 2,650,536 Ps. 2,343,902 Equity securities In Colombian Pesos Corporate Stock Ps. 4,188 Ps. 3,233 Investment Funds 802,941 644,063 Pension and severance funds (1) 1,279,009 1,100,318 Ps. 2,086,138 Ps. 1,747,614 In foreign currency Corporate Stock 49,812 - Investment Funds 13,210 - Ps. 63,022 Ps. - Total Equity Securities Ps. 2,149,160 Ps. 1,747,614 Total Trading Securities Ps. 4,799,696 Ps. 4,091,516 (1) Pursuant to Colombian rules the subsidiary Porvenir S. A. is required to directly invest in mandatory severance and pension funds managed by Porvenir, 1% of the total assets of these funds. For the years ended December 31, 2017, 2016 and 2015, dividends from these equity investments in the amount of Ps.50,439, Ps. 28,027 and Ps. 33,611 respectively, were recognized in profit or loss. The following is a list of held-for-trading financial assets that are being used as collateral in repo operations, pledged as collateral for transactions with financial instruments, or pledged to third parties as collateral to secure financial obligations with other banks (See note 21). December 31, December 31, Pledged as collateral in money market operations Securities issued or secured by Central Banks Ps. 5,217 Ps. 5,611 Securities issued or secured by Foreign Governments 54,644 50,831 Securities issued or secured by Colombian Government 744,332 562,986 Securities issued or secured by other financial entities 9,590 9,693 Ps. 813,783 Ps. 629,121 Pledged as collateral to special entities such as CRCC, BR and BVC (*) Securities issued or secured by Colombian Government Ps. 29,292 Ps. - 29,292 - Ps. 843,075 Ps. 629,121 (*) Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valores de Colombia - BVC

AVAILABLE- FOR- SALE FINANCIAL

AVAILABLE- FOR- SALE FINANCIAL ASSETS	12 Months Ended
	Dec. 31, 2017
Disclosure of available for sale financial assets [Abstract]
Disclosure of available-for-sale financial assets [text block]	NOTE 8 – AVAILABLE- FOR- SALE FINANCIAL ASSETS The following is the balance of available-for-sale financial assets at December 31, 2017 and 2016. December 31, 2017 Cost Unrealized Unrealized Fair Value Available-for-sale securities Debt Securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 7,855,098 Ps. 68,411 Ps. (30,955 ) Ps. 7,892,554 Securities issued or secured by other Colombian Government entities 90,532 1,566 (90 ) 92,008 Securities issued or secured by other financial entities 255,192 8,643 (202 ) 263,633 Securities issued or secured by Non-financial sector entities 2,282 44 - 2,326 Others 7,074 116 - 7,190 Ps. 8,210,178 Ps. 78,780 Ps. (31,247 ) Ps. 8,257,711 In foreign currency Securities issued or secured by Colombian Government 1,587,359 9,160 (4,148 ) 1,592,371 Securities issued or secured by other Colombian Government entities 565,762 11,685 (6,753 ) 570,694 Securities issued or secured by Foreign Governments 2,113,106 8,655 (17,364 ) 2,104,397 Securities issued or secured by Central Banks 1,359,924 739 (3,789 ) 1,356,874 Securities issued or secured by other financial entities 3,366,119 3,210 (14,885 ) 3,354,444 Securities issued or secured by Non-financial sector entities (**) 345,003 21,681 (44,541 ) 322,143 Others 230,412 2,710 (1,629 ) 231,493 Ps. 9,567,685 Ps. 57,840 Ps. (93,109 ) Ps. 9,532,416 Total Debt Securities Ps. 17,777,863 Ps. 136,620 Ps. (124,356 ) Ps. 17,790,127 Equity Instruments In Colombian Pesos Corporate Stock Ps. 276,452 Ps. 541,520 Ps. (75 ) Ps. 817,897 In foreign currency Corporate Stock 452 5,684 - 6,136 Total Equity Securities Ps. 276,904 Ps. 547,204 Ps. (75 ) Ps. 824,033 Total available-for-sale investments and unrealized gain (loss) in Other Comprehensive Income Ps. 18,054,767 Ps. 683,824 Ps. (124,431 ) Ps. 18,614,160 (*) Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from two issuers were classified as impaired and realized the impairment in statement of profit or loss as explained in below (**). (**) Cost is net of Ps. 71,708 for impairment recognized in statement of income as operating expense for the securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries filed for bankruptcy protection on June, 2016. December 31, 2016 Cost Unrealized Unrealized Fair Available-for-sale securities Debt Securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 9,371,078 Ps. 16,622 Ps. (183,521 ) Ps. 9,204,179 Securities issued or secured by other Colombian Government entities 83,582 386 (4,533 ) 79,435 Securities issued or secured by other financial entities 116,683 4,317 (205 ) 120,795 Securities issued or secured by Non-financial sector entities 18,390 - (467 ) 17,923 Others 15,820 33 (1 ) 15,852 Ps. 9,605,553 Ps. 21,358 Ps. (188,727 ) Ps. 9,438,184 In foreign currency Securities issued or secured by Colombian Government 1,368,836 7,018 (4,825 ) 1,371,029 Securities issued or secured by other Colombian Government entities 496,223 1,843 (8,189 ) 489,877 Securities issued or secured by Foreign Governments 2,082,953 13,400 (13,008 ) 2,083,345 Securities issued or secured by Central Banks 539,393 596 (1,258 ) 538,731 Securities issued or secured by other financial entities 2,978,145 6,045 (28,266 ) 2,955,924 Securities issued or secured by Non-financial sector entities (**) 658,703 10,779 (88,692 ) 580,790 Others 205,143 1,486 (1,776 ) 204,853 Ps. 8,329,396 Ps. 41,167 Ps. (146,014 ) Ps. 8,224,549 Total Debt Securities Ps. 17,934,949 Ps. 62,525 Ps. (334,741 ) Ps. 17,662,733 Equity Instruments In Colombian Pesos Corporate Stock Ps. 239,502 Ps. 485,935 Ps. (82 ) Ps. 725,355 In foreign currency Corporate Stock 393 4,031 - 4,424 Total Equity Securities Ps. 239,895 Ps. 489,966 Ps. (82 ) Ps. 729,779 Total investments available-for-sale and unrealized gain (loss) in Other comprehensive income Ps. 18,174,844 Ps. 552,491 Ps. (334,823 ) Ps. 18,392,512 (*) Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from one issuer were classified as impaired. (**) Cost is net of Ps. 72,110 for impairment recognized in statement of income in impairment loss on financial asset line from the debt investment securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries which filed for bankruptcy protection on June, 2016. The details of available-for-sale equity instruments as of December 31, 2017 and 2016 are as follows. Entity (*) December 31, December 31, Empresa de Energia de Bogota S.A. E.S.P. Ps. 659,208 Ps. 592,142 Gas Natural S.A. ESP 49,998 74,624 Mineros S.A. 56,546 42,913 Bolsa de Valores de Colombia S.A. 52,064 15,603 Master Card 5,634 3,874 Others 583 623 Total Ps. 824,033 Ps. 729,779 (*) These investments in equity securities have been designated as available-for-sale sale taking into account that they represent strategic investments for Grupo Aval and therefore, they are not expected to be sold in a foreseeable future. The following is a list of available-for-sale debt securities that are being used as collateral in repo operations, pledged as collateral in transactions with financial instruments, or pledged to third parties as collateral to secure financial obligations with other banks (See note 21). December 31, December 31, Pledged as collateral in money market operations Securities issued or secured by Foreign Governments Ps. 148,816 Ps. 299,560 Securities issued or secured by Colombian Government 2,215,568 4,174,184 Securities issued or secured by Non-financial sector entities - 3,020 Securities issued or secured by other Colombian Government entities 133,701 83,076 Securities issued or secured by other financial entities 38,536 35,809 Others 50,273 39,335 Ps. 2,586,894 Ps. 4,634,984 Pledged as collateral in operations with derivative instruments Securities issued or secured by Colombian Government 77,736 151,343 Ps. 77,736 Ps. 151,343 Pledged as collateral to special entities such as CRCC, BR and BVC (*) Securities issued or secured by Colombian Government 291,878 - Ps. 291,878 Ps. - Other collaterals Securities issued or secured by Central Banks Ps. 158,951 Ps. - 158,951 - Ps. 3,115,459 Ps. 4,786,327 (*) Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valor es de Colombia – BVC A summary of the maturity dates of available-for-sale debt securities follows: December 31, December 31, Fair Value Up to 1 month Ps. 495,315 Ps. 881,951 More than 1 month and no more than 3 months 601,654 313,386 More than 3 months and no more than 1 year 2,236,367 2,204,219 More than 1 year and no more than 5 years 11,436,614 9,544,836 More than 5 years and no more than 10 years 2,792,063 4,345,791 More than 10 years 228,114 372,550 Ps. 17,790,127 Ps. 17,662,733 Cost Up to 1 month Ps. 495,284 Ps. 880,907 More than 1 month and no more than 3 months 601,156 313,048 More than 3 months and no more than 1 year 2,235,214 2,199,014 More than 1 year and no more than 5 years 11,437,189 9,669,504 More than 5 years and no more than 10 years 2,768,870 4,483,043 More than 10 years 240,140 389,433 Ps. 17,777,853 Ps. 17,934,949

HELD-TO-MATURITY INVESTMENTS

HELD-TO-MATURITY INVESTMENTS	12 Months Ended
	Dec. 31, 2017
Disclosure of Held-To-Maturity Investments [Abstract]
Disclosure of held to maturity investment [Text Block]	NOTE 9 – HELD-TO-MATURITY INVESTMENTS The breakdown of held-to-maturity investments as of December 31, 2017 and 2016 as follows: December 31, 2017 December 31, 2016 Debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 424 Ps. 1,829 Securities issued or secured by other Colombian Government entities 2,839,286 2,484,078 Securities issued or secured by other financial entities 8,635 58,887 Ps. 2,848,345 Ps. 2,544,794 In foreign currency Securities issued or secured by Foreign Governments 26,864 24,152 Securities issued or secured by other financial entities 23,830 - Others - 1,540 Ps. 50,694 Ps. 25,692 Total held-to-maturity investments Ps. 2,899,039 Ps. 2,570,486 As of December 31, 2017 and 2016 there are no held-to-maturity securities pledged as collateral for financial liabilities. The following is a summary of held-to-maturity securities financial assets by maturity dates: December 31, 2017 December 31, 2016 Up to 1 month Ps. 722,026 Ps. 695,201 More than 1 month and no more than 3 months 38,071 27,608 More than 3 months and no more than 1 year 2,133,344 1,842,566 More than 1 year and no more than 5 years 5,598 4,938 More than 5 years and no more than 10 years - - More than 10 years - 173 Ps. 2,899,039 Ps. 2,570,486

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING	12 Months Ended
	Dec. 31, 2017
Discloser Of Derivative Instruments and Hedge Accounting [Abstract]
Disclosure of derivative financial instruments [text block]	NOTE 10 – DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING 10.1 Derivative Instruments The tables below show fair values as of December 31, 2017 and 2016 of Grupo Aval´s outstanding forward contracts, futures, interest rate swaps and foreign currency swaps. Held-for-trading derivative financial instruments comprise the following: December 31, 2017 December 31, 2016 Item Notional Amount Fair Value Notional Amount Fair Value Assets Forward contracts Foreign currency to buy Ps. 6,126,920 Ps. 60,799 Ps. 5,255,735 Ps. 118,568 Foreign currency to sell 10,769180 163,156 10,206,225 272,803 Debt securities to buy 191,500 357 - - Debt securities to sell 430,035 374 - - Subtotal Ps. 17,517,635 Ps. 224,686 Ps. 15,461,960 Ps. 391,371 Swap Cross currency 1,534,252 33,104 1,288,048 44,593 Interest rate 6,855,627 52,970 6,021,481 39,780 Subtotal Ps. 8,389,879 Ps. 86,074 Ps. 7,309,529 Ps. 84,373 Futures Contracts Foreign currency to buy 1,192,880 - 1,069,003 - Foreign currency to sell 2,873,592 - 1,198,784 - Debt securities to buy 408,000 - Debt securities to sell 84,000 - - - Subtotal Ps. 4,558,472 Ps. - Ps. 2,267,787 Ps. - Options Contracts Foreign currency to buy - - 563,522 10,769 Interest rate to buy - - 31,550 152 Debt securities to buy 1,369,942 17,632 739,512 15,544 Debt securities to sell - - Subtotal 1,369,942 17,632 1,334,584 26,465 Total Assets Ps. 31,835,928 Ps. 328,392 Ps. 26,373,860 Ps. 502,209 Liabilities Forward contracts Foreign currency to buy Ps. 9,027,166 Ps. 120,083 Ps. 9,286,812 Ps. 247,967 Sale of Foreign currency 5,547,955 24,489 7,039,126 160,936 Debt securities to buy 185,000 171 Debt securities to sell 437,100 936 597,500 1,492 Subtotal Ps. 15,197,221 Ps. 145,679 Ps. 16,923,438 Ps. 410,395 Swap Cross currency 1,574,121 79,263 1,771,324 164,906 Interest rate 5,884,551 40,693 4,210,766 25,827 Subtotal Ps. 7,458,672 Ps. 119,956 Ps. 5,982,090 Ps. 190,733 Futures Contracts Foreign currency to buy 4,508,630 - 1,995,604 - Foreign currency to sell 815,407 - 409,747 - Subtotal Ps. 5,324,037 Ps. - Ps. 2,405,351 Ps. - Options Contracts Foreign currency to buy - - - - Foreign currency to sell Ps. 1,035,376 Ps. 33,030 Ps. 447,818 Ps. 19,960 Debt securities to sell - - 556,310 19,607 Subtotal Ps. 1,035,376 Ps. 33,030 Ps. 1,004,128 Ps. 39,567 Total Liabilities Ps. 29,015,306 Ps. 298,665 Ps. 26,315,007 Ps. 640,695 Derivative Financial Instruments for hedging purposes comprise the following: December 31, 2017 December 31, 2016 Item Notional Amount Fair Value Notional Amount Fair Value Assets Forward contracts Foreign currency to buy Ps. 11,164 Ps. 1 Ps. 474,412 Ps. 3,914 Foreign currency to sale 2,589,739 55,260 3,735,363 124,565 Subtotal Ps. 2,600,903 Ps. 55,261 Ps. 4,209,775 Ps. 128,479 Futures Contracts Foreign currency to buy 29,840 - 150,036 - Foreign currency to sell 1,602,408 - 973,730 - Subtotal 1,632,248 - 1,123,766 - Total Assets Ps. 4,233,151 Ps. 55,261 Ps. 5,333,541 Ps. 128,479 Liabilities Forward contracts Foreign currency to buy 729,692 5,455 967,702 28,297 Foreign currency to sell 1,106,975 8,009 1,536,849 15,139 Subtotal Ps. 1,836,667 Ps. 13,464 Ps. 2,504,551 Ps. 43,436 Future Contracts Foreign currency to buy 387,920 - 363,086 - Foreign currency to sell 1,153,316 - 190,545 - Subtotal Ps. 1,541,236 Ps. - Ps. 553,631 Ps. - Total Liabilities Ps. 3,377,903 Ps. 13,464 Ps. 3,058,182 Ps. 43,436 Derivative instruments contracted by Grupo Aval or its consolidated entities are generally traded in either domestic financial markets or in over-the-counter international markets. Derivative instruments have a net favorable position (asset) or a net unfavorable position (liability) as a result of fluctuations in exchange rates, in interest rates or other variables relating to market conditions. As a result, the aggregate amount of fair values of the assets and liabilities in derivative instruments may vary significantly from time to time. 10.2 Hedge Accounting In accordance with its risk management policies, Grupo Aval uses hedge accounting to manage foreign exchange risk relating to investments in foreign operations and in forecasted transactions of its subsidiary Promigas, as follows: 10.2.1 Hedges of net investment in foreign operations Banco de Bogotá, Banco de Occidente and Promigas are exposed to foreign exchange risk relating to its investments in foreign subsidiaries, whose functional currencies are the US dollar. The purpose of hedge accounting is to mitigate and offset any adverse changes resulting from the fluctuation in exchange rate of the Colombian Peso and the functional currency of such investments. The impacts of those movements are reflected in the cumulative translation adjustment in other comprehensive income of the consolidated financial statements. To cover this risk, Grupo Aval hedges its exposure through foreign currency financial liabilities expressed in U.S. dollars and forward contracts for the sale of U.S. dollars, as permitted under IAS 39. Changes in the fluctuation of the Colombian peso against the U.S. dollar are as follows: Date Value of USD 1 Variation in pesos December 31, 2015 3,149.47 757.01 December 31, 2016 3,000.71 (148.76 ) December 31, 2017 2,984.00 (16.71 ) According to information described above, the following table contains details of hedging operations carried out to cover foreign denominated equity investments. The analysis is presented gross of taxes: December 31, 2017 Thousands of USD Ps. millions Detail of investment Investment Amount of Amount of Cumulative Exchange Exchange Net OCI Leasing Bogotá Panamá 3,781,475 (2,067,100 ) (1,703,009 ) 3,065,281 (1,045,872 ) (2,155,488 ) (136,079 ) Other subsidiaries and branches Banco de Bogotá (2) 113,909 - (112,049 ) 92,891 - (90,431 ) 2,460 Occidental Bank Barbados 26,396 (26,396 ) - 18,740 (18,740 ) - - Banco de Occidente Panamá 25,044 (25,044 ) - 29,979 (29,979 ) - - Sociedad Portuaria El Cayao S.A. E.S.P. (3) 25,000 (25,000 ) - 2,207 (2,207 ) - - Gases del Pacífico S.A.C. (3) 10,214 (10,214 ) - 902 (902 ) - - Gas Natural de Lima y Callao S.A.C. – Calidda (3) 15,895 (15,895 ) - 1,272 (1,272 ) - - Total 3,997,933 (2,169,649 ) (1,815,058 ) 3,211,272 (1,098,972 ) (2,245,919 ) (133,619 ) (1) Includes exchange difference hedged (2) Includes Banco de Bogotá Panamá, Banco Bogotá Finance, Ficentro and contributions of foreign branches in Miami, New York and Nassau. (3) Includes only a portion of this investments hedged December 31, 2016 Thousands of USD Ps. Millions Detail of investment Investment Amount of Amount of Cumulative Exchange Exchange Net OCI Leasing Bogotá Panamá 3,436,658 (2,074,100 ) (1,346,889 ) 3,115,527 (1,080,737 ) (2,171,234 ) (136,444 ) Other subsidiaries and branches Banco de Bogotá (2) 100,827 - (100,260 ) 94,139 - (91,517 ) 2,622 Occidental Bank Barbados 25,401 (25,401 ) - 19,176 (19,176 ) - - Banco de Occidente Panamá 21,699 (21,699 ) - 29,627 (29,627 ) - - Total 3,584,585 (2,121,200 ) (1,447,149 ) 3,258,469 (1,129,540 ) (2,262,751 ) (133,822 ) (1) Includes only exposure hedged under hedge accounting. (2) Includes Banco de Bogotá Panamá, Banco Bogotá Finance, Ficentro and contributions of foreign branches in Miami, New York and Nassau. 10.2.2 Hedging with Forward Contracts Forward contracts to sell U.S. dollars have been contracted to hedge part of the net foreign investment that Banco de Bogotá has in Leasing Bogotá Panamá and others foreign subsidiaries. The forward contracts were executed with counterparties from the financial sector and the hedge was documented as a "dynamic hedging strategy," where new forward contracts are signed simultaneously as the previous ones expire. According to IAS 39, changes in the fair value of derivatives due to changes in the peso/U.S. dollar exchange rate are registered under “Other Comprehensive Income” in equity and the ineffective part is recognized in the statement of income for the period 10.2.3 Hedging with Debt in Foreign Currency in U.S. dollars Debt financial instruments that are not derivatives can be designated as hedging instruments of changes in foreign currency exchange rates. According to this rule Banco de Bogotá and Banco de Occidente designed debt in U.S. dollar as hedging instruments of their foreign subsidiaries as follows: · Bonds issued by Banco de Bogotá in the international market were designated as hedging instruments of its investment in Leasing Bogotá Panamá amounting US$2,067 million in 2017 and US$2,074 million in 2016. · Other financial liabilities in the amount of $103 million as December 31, 2017 (US$47 million as of December 31, 2016) were used to hedge part of the net foreign investment that Banco de Bogotá, Banco de Occidente and Promigas has in foreign subsidiaries as part of a hedging strategy, by which when some obligations expire, new obligations will be designated to replace them. · Between December 21, 2015 and November 2, 2016, financial liabilities designated as hedging instruments described above included an intra-group liability amounting to US$ 500 million that Banco de Bogotá had as a hedging instrument of its investment in Leasing Bogotá Panamá. This operation was eliminated in the consolidation process of Grupo Aval and was excluded of the foreign investment hedge accounting. Starting May 1st and up to November 2nd, 2016 Grupo Aval designated financial assets in foreign debt securities amounting to US$ 500 million as cash flow hedge, the foreign exchange differences of this intra-group liability were not eliminated in the consolidation process and recorded in Other Comprehensive Income in the amount of Ps. 73,705. This value would be realized in the future as income only when the investment in Leasing Bogotá Panamá is sold. On November 2nd, 2016 Banco de Bogotá cancelled the intragroup liability amounting to US$ 500 million which was replaced in the foreign investment hedge accounting with other obligations in foreign currency with third parties. 10.2.4 Hedging of Forecasted Transactions In the ordinary course of its operations Promigas S.A. and its subsidiaries receive income in U.S. Dollars derived from the transportation of gas in their gas pipelines. Promigas and its subsidiaries hedge the exchange risk arising in future transactions of highly probable gas transportation income, entered into forward contracts for the sale of U.S. dollars with financial entities different from the ones consolidated into Grupo Aval. During the years ended December 31, 2017, 2016 and 2015, an exchange difference recognized under “Other Comprehensive Income” as a result of cash flow hedge accounting of income from these highly probable transactions, was reclassified to profit or loss in the amounts of Ps. (26,846), Ps. 5,037 and Ps. (16,542) respectively. The following is the summary of Promigas and its subsidiaries open cash flow hedges: December 31, December 31, Income in U.S. dollars forecasted 41,614 142,731 Notional amount contracts forward U.S. dollars 41,614 99,912 % hedged 100 % 70 % Fair value in Colombian pesos 4,303 4,824 # of contracts 468 892 The movement of the accumulated OCI account related to cash flow hedges in Colombian pesos during the years ended on December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year 6,210 (11,757 ) (26,790 ) Changes in the fair value of the hedge forward contracts 24,506 12,930 31,575 Reclassified to profit or loss (26,846 ) 5,037 (16,542 ) Balance at the end of the year Ps. 3,870 Ps. 6,210 Ps. (11,757 ) 10.2.5 Testing of Hedge Effectiveness Grupo Aval considers hedging as highly effective if at the beginning and in subsequent periods, the hedging is highly effective at offsetting changes in fair value or in cash flows attributable to the risk hedged during the period for which the hedging has been designated. The hedging is considered as such if the effectiveness of the hedging is in a range between 80% and 125%. Such effectiveness is assessed by Grupo Aval‘s entities at least quarterly and at the end of each accounting period. Grupo Aval has documented the hedging effectiveness of its foreign currency denominated investments in based on the portion of the net investment hedged at the beginning of the hedging relationship. Since the net balance of these investments fluctuates during the year, Grupo Aval evaluates the hedging relationship on a daily basis as well as the result of the testing of hedge effectiveness. 10.2.6 Hedge Effectiveness with Forward Contracts Grupo Aval applies the method of the forward rate used in forward contracts to evaluate the hedge effectiveness; for such purpose, Grupo Aval measures the hedge ineffectiveness comparing the value of current forward contracts, which serve as hedge, with the change in the value of a hypothetical derivative with the same maturity. 10.2.7 Hedge Effectiveness with Debt Instruments in Foreign Currency For debt instruments in foreign currency designated as a hedging instrument, the gain or loss arising from the conversion of the debt to Colombian Pesos is based on the current exchange rate between the U.S. dollar and the Colombian Peso, which is the functional currency of Grupo Aval. If the notional amount of the hedging instrument exactly matches with the portion of the hedged investment in foreign operations, no ineffectiveness is registered in the statement of income.

LOANS

LOANS	12 Months Ended
	Dec. 31, 2017
Disclosure of loans and receivables [Abstract]
Disclosure of loans and advances to customers [text block]	NOTE 11 – LOANS Loans are recorded at amortized cost on the statement of financial position and are classified as commercial, consumer, mortgages, and microcredit. Due to the significance of the financial leasing portfolio for Grupo Aval, these amounts are also presented in all the tables in the note of credit risks for disclosure purposes: December 31, 2017 Portfolio segment Balance in Statement of Leasing presentation Balance according to Commercial Ps. 99,428,894 Ps. (9,892,400 ) Ps. 89,536,494 Consumer 50,382,895 (226,764 ) 50,156,131 Residential mortgage 16,151,299 (1,047,766 ) 15,103,533 Microcredit 409,688 - 409,688 Financial Leasing - 11,166,930 11,166,930 Total portfolio Ps. 166,372,776 Ps. - Ps. 166,372,776 December 31, 2016 Portfolio segment Balance in Statement of Leasing presentation Balance according to Commercial Ps. 93,149,211 Ps. (9,958,095 ) Ps. 83,191,116 Consumer 46,927,997 (215,608 ) 46,712,389 Residential mortgage 14,683,537 (902,104 ) 13,781,433 Microcredit 399,431 - 399,431 Financial Leasing - 11,075,807 11,075,807 Total portfolio Ps. 155,160,176 Ps. - Ps. 155,160,176 11.1. Credit Portfolio by Product The distribution of the credit portfolio of Grupo Aval by product is shown as follows: December 31, 2017 December 31, 2016 General purpose loans Ps. 64,153,372 Ps. 60,561,432 Personal loans 30,553,566 28,308,406 Working capital loans 14,723,490 15,524,372 Mortgages 15,103,533 13,781,433 Credit Cards 13,846,823 12,781,182 Commercial financial leases 9,892,402 9,958,096 Consumer financial leases 226,764 215,608 Automobile and vehicle loans 5,896,640 5,736,357 Interbank &; Overnight Funds 7,279,047 3,569,587 Loans funded by development banks 2,713,818 2,829,091 Housing leases 1,047,766 902,104 Overdrafts 525,867 593,077 Microcredit 409,688 399,431 Gross balance of Financial Assets of credit portfolio 166,372,776 155,160,176 Allowance for impairment of financial assets from the loan portfolio (5,618,481 ) (4,261,444 ) Net balance of Financial Assets to credit portfolio Ps. 160,754,295 Ps. 150,898,732 11.2. Loan impairment provision The movement of the impairment provision of the financial assets of the credit portfolio during the years ended December 31, 2017, 2016 and 2015 is as follows Commercial Consumer Mortgage Microcredit Financial Total Balance as of December 31, 2014 Ps. 1,448,771 Ps. 1,404,743 Ps. 70,709 Ps. 47,808 Ps. 185,772 Ps. 3,157,803 Allowance of the period charged to profit or loss 1,310,679 2,182,141 42,313 37,506 214,797 3,787,436 Recovery of provisions with partial payment to profit or loss (663,931 ) (916,030 ) (24,797 ) (14,505 ) (97,012 ) (1,716,275 ) Charge-offs of the year (198,727 ) (1,304,058 ) (14,160 ) (33,096 ) (86,405 ) (1,636,446 ) Exchange differences (217,563 ) 312,351 21,037 11,493 (1,512 ) 125,806 Balance as of December 31, 2015 Ps. 1,679,229 Ps. 1,679,147 Ps. 95,102 Ps. 49,206 Ps. 215,640 Ps. 3,718,324 Allowance of the period charged to profit or loss 1,522,077 3,088,950 75,059 72,917 225,498 4,984,501 Recovery of provisions with partial payment to profit or loss (857,465 ) (976,258 ) (37,863 ) (18,119 ) (162,033 ) (2,051,738 ) Charge-offs of the year (495,326 ) (1,759,896 ) (15,828 ) (28,703 ) (55,234 ) (2,354,987 ) Exchange differences (33,571 ) (9,118 ) 7,630 (12,164 ) 12,567 (34,656 ) Balance as of December 31, 2016 Ps. 1,814,944 Ps. 2,022,825 Ps. 124,100 Ps. 63,137 Ps. 236,438 Ps. 4,261,444 Allowance of the period charged to profit or loss 1,825,905 3,403,092 81,189 64,627 222,043 5,596,856 Recovery of provisions with partial payment to profit or loss (584,091 ) (780,874 ) (28,051 ) (29,237 ) (112,671 ) (1,534,924 ) Charge-offs of the year (400,653 ) (2,165,857 ) (45,918 ) (24,360 ) (46,754 ) (2,683,542 ) Sale of portfolio - (24,503 ) - - - (24,503 ) Exchange differences 3,217 2,108 (438 ) - (1,737 ) 3,150 Balance as of December 31, 2017 Ps. 2,659,322 Ps. 2,456,791 Ps. 130,882 Ps. 74,167 Ps. 297,319 Ps. 5,618,481 11.3. Credit Portfolio Assessed Collectively and Individually The detailed information of credit risk impairment provisions accrued as of December 31, 2017 and 2016, taking into account how they were determined individually for loans above of Ps. 2,000 and collectively for other credits. Loans individually assessed for impairment lower than Ps. 2,000 are considered in the allowances for each type of credit. December 31, 2017 Impairment provision: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually Ps. 1,363,315 Ps. 70 Ps. 781 Ps. - Ps. 126,867 Ps. 1,491,033 Loans assessed collectively 1,296,007 2,456,721 130,101 74,167 170,452 4,127,448 Total impairment provision Ps. 2,659,322 Ps. 2,456,791 Ps. 130,882 Ps. 74,167 Ps. 297,319 Ps. 5,618,481 Gross balance of financial assets for credit portfolio: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually (1) Ps. 49,846,935 Ps. 51,768 Ps. 14,934 Ps. - Ps. 5,444,122 Ps. 55,357,759 Loans assessed collectively 39,689,559 50,104,363 15,088,599 409,688 5,722,808 111,015,017 Total gross investment value of portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 December 31, 2016 Impairment provision: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually Ps. 724,522 Ps. 47 Ps. 827 Ps. - Ps. 74,098 Ps. 799,494 Loans assessed collectively 1,090,422 2,022,778 123,273 63,137 162,340 3,461,950 Total impairment provision Ps. 1,814,944 Ps. 2,022,825 Ps. 124,100 Ps. 63,137 Ps. 236,438 Ps. 4,261,444 Gross balance of financial assets for credit portfolio: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually (1) Ps. 48,565,393 Ps. 92,410 Ps. 8,506 Ps. - Ps. 5,113,843 Ps. 53,780,152 Loans assessed collectively 34,625,723 46,619,979 13,772,927 399,431 5,961,964 101,380,024 Total gross investment value of portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) Loans individually evaluated for impairment that are not considered impaired, additionally are evaluated collectively for impairment according to historical losses experience adjusted to reflect current economic conditions. 11.4 Portfolio of impaired loans assessed individually for impairment The detailed information as of December 31, 2017 and 2016 is as follows December 31, 2017 Gross Amount Registered Collateral Guarantees Allowance Recognized Without recognized provision Commercial Ps. 180,527 Ps. 242,366 Ps. - Financial Leasing 186,725 564,540 - Subtotal Ps. 367,252 Ps. 806,906 Ps. - With recognized provision Commercial Ps. 3,972,638 Ps. 228,667 Ps. 1,363,315 Consumer 233 - 70 Residential Mortgage 1,907 - 781 Financial Leasing 599,747 161,309 126,867 Subtotal Ps. 4,574,525 Ps. 389,976 Ps. 1,491,033 Totals Commercial 4,153,165 471,033 1,363,315 Consumer 233 - 70 Residential Mortgage 1,907 - 781 Financial Leasing 786,472 725,849 126,867 Total Ps. 4,941,777 Ps. 1,196,882 Ps. 1,491,033 December 31, 2016 Gross Amount Collateral Allowance Without recognized provision Commercial Ps. 262,831 Ps. 208,604 Ps. - Financial Leasing 138,513 484,339 - Subtotal Ps. 401,344 Ps. 692,943 Ps. - With recognized provision Commercial Ps. 3,156,154 Ps. 221,203 Ps. 724,522 Consumer 141 - 47 Residential Mortgage 1,907 - 827 Financial Leasing 327,755 165,221 74,098 Subtotal Ps. 3,485,957 Ps. 386,424 Ps. 799,494 Totals Commercial 3,418,985 429,807 724,522 Consumer 141 - 47 Residential Mortgage 1,907 - 827 Financial Leasing 466,268 649,560 74,098 Total Ps. 3,887,301 Ps. 1,079,367 Ps. 799,494 The difference between the value of the loan and the guarantees disclosed on the table above correspond to unsecured loans valued with the discounted cash flow method. When using this method it is implied that it is possible for the customer to make future payments. 11.5. Loan portfolio by maturity The distribution of loan portfolio of Grupo Aval by maturity period is as follows: December 31, 2017 Up to 1 From 1 to 3 From 3 to More than Total Commercial Ps. 44,888,149 Ps. 19,651,034 Ps. 11,088,553 Ps. 13,908,758 Ps. 89,536,494 Consumer 16,240,350 11,146,916 8,809,557 13,959,308 50,156,131 Residential Mortgage 469,702 785,736 857,039 12,991,056 15,103,533 Microcredit 209,364 178,052 17,707 4,565 409,688 Financial Leasing 2,159,750 2,889,713 2,496,769 3,620,698 11,166,930 Total gross credit portfolio Ps. 63,967,315 Ps. 34,651,451 Ps. 23,269,625 Ps. 44,484,385 Ps. 166,372,776 December 31, 2016 Up to 1 From 1 to 3 From 3 to More than Total Commercial Ps. 36,982,196 Ps. 19,083,900 Ps. 10,957,767 Ps. 16,167,253 Ps. 83,191,116 Consumer 15,207,864 10,928,357 8,188,856 12,387,312 46,712,389 Residential Mortgage 396,964 706,364 732,454 11,945,651 13,781,433 Microcredit 166,719 208,759 19,610 4,343 399,431 Financial Leasing 2,571,103 2,775,490 2,192,804 3,536,410 11,075,807 Total gross credit portfolio Ps. 55,324,846 Ps. 33,702,870 Ps. 22,091,491 Ps. 44,040,969 Ps. 155,160,176 11.6. Loan portfolio by currency The classification of loan portfolio by type of currency is as follows: December 31, 2017 Colombian Pesos Foreign Currency Total Commercial Ps. 56,516,054 Ps. 33,020,440 Ps. 89,536,494 Consumer 32,822,355 17,333,776 50,156,131 Residential Mortgage 5,674,639 9,428,894 15,103,533 Microcredit 409,688 - 409,688 Financial Leasing 9,132,401 2,034,529 11,166,930 Total gross credit portfolio Ps. 104,555,137 Ps. 61,817,639 Ps. 166,372,776 December 31, 2016 Colombian Pesos Foreign Currency Total Commercial Ps. 54,026,331 Ps. 29,164,785 Ps. 83,191,116 Consumer 30,452,658 16,259,731 46,712,389 Residential Mortgage 4,822,806 8,958,627 13,781,433 Microcredit 399,431 - 399,431 Financial Leasing 8,953,491 2,122,316 11,075,807 Total gross credit portfolio Ps. 98,654,717 Ps. 56,505,459 Ps. 155,160,176 11.7. Financial Leasing portfolio As of December 31, 2017 and 2016 the following table shows the reconciliation between gross investment in financial leasing and the present value of minimum payments to be received in these dates: December December Total gross rent payments receivable Ps. 16,445,998 Ps. 17,071,858 Less amounts representing running costs (such as taxes, maintenance, insurances ,etc.,) (225 ) (2,527 ) Plus Estimated residual amount of assets given for rental (without guarantee) 21,673 21,162 Gross investment in contracts of financial leasing 16,467,446 17,090,493 Less unrealized financial income (5,300,516 ) (6,014,686 ) Net investment in contracts of financial leasing 11,166,930 11,075,807 Impairment of net investment in financial leasing Ps. (297,319 ) Ps. (236,438 ) The detailed information of gross investment and net investment in financial leasing contracts receivable as of December 31, 2017 and 2016 in each period is as follows: December 31, 2017 Gross investment Net investment Up to 1 year Ps. 2,147,421 Ps. 1,614,889 From 1 to 5 years 6,428,242 4,986,723 More than 5 years 7,891,783 4,565,318 Total Ps. 16,467,446 Ps. 11,166,930 December 31, 2016 Gross investment Net investment Up to 1 year Ps. 2,711,147 Ps. 2,128,441 From 1 to 5 years 6,375,267 4,798,364 More than 5 years 8,004,079 4,149,002 Total Ps. 17,090,493 Ps. 11,075,807 The banks of Grupo Aval grant loans through the modality of financial leasing mainly for the financing of vehicles and computer equipment, generally with terms between 36 and 60 months with an purchase option, machinery and equipment with terms of 60 to 120 months with a purchase option at the end of the contract and for housing leasing with terms of 120 to 240 months transferring the asset at the end of the contract. All these leasing contracts are granted at current market interest rates at inception.

OTHER ACCOUNTS RECEIVABLE, NET

OTHER ACCOUNTS RECEIVABLE, NET	12 Months Ended
	Dec. 31, 2017
Disclosure of other accounts receivables [Abstract]
Disclosure of trade and other receivables [text block]	NOTE 12 – OTHER ACCOUNTS RECEIVABLE, NET The detailed information of other accounts receivable as of December 31, 2017 and 2016 is as follows: December 31, December 31, Accounts receivable for goods and services sales in Non-financial sector companies Ps. 1,070,936 Ps. 1,066,628 Financial assets in concession contract at amortized cost ( See note 16) 786,018 203,241 Credit card compensations and network compensation 426,090 249,430 Fees, services and advances 258,850 272,488 Dormant customer deposits ICETEX (1) 256,806 237,034 Payment in advance 228,765 262,473 Debtors 224,340 178,785 Commissions 186,646 131,867 Transfers in process 185,634 166,153 Deposits 142,168 138,520 Payment in advance to supplier's contract 117,858 39,309 Holding and parent establishment 114,513 230,950 Transfers to the National Treasury 58,042 52,351 Storage services 43,767 41,282 Quota shares retirement pensions 28,485 30,396 Claims to insurance companies 14,450 19,201 Dividends 3,561 16,263 Deductible taxes 11,961 15,611 Promissory sellers 15,144 11,661 Payment in advance for industry and trade taxes 13,392 11,553 Others 278,708 344,476 Gross balance of other accounts receivable 4,466,134 3,719,672 Impairment allowance (226,862 ) (195,078 ) Other accounts receivable, net Ps. 4,239,272 Ps. 3,524,594 (1) Pursuant to Colombian Law number 1777 of 2016, financial institutions in Colombia since August 1, 2016, must transfer the funds from clients’ in dormant customer deposits to a special fund as a loan to a Colombian Government entity denominated “ICETEX”, and classified as “Other accounts receivable” given it is permanently deemed refundable to any particular client. This Government entity Fund is responsible for managing the monies funds with the commitment to return them at the time the bank customer account holder requests them. Dormant client’s customer deposits are accounts of savings or current accounts that exceed the 322 UVR (Real Value Units) equivalent to Ps. 81,663 pesos, on which no deposit, withdrawal, transfer or, in general, debit or credit movements have been made during an uninterrupted period of three years. Roll-forward on the allowance to accounts receivable for the years ended December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 195,078 Ps. 194,450 Ps. 222,385 Provision charged to profit or loss 98,024 105,942 96,775 Recovery for partial payments from the clients (18,383 ) (32,514 ) (40,185 ) Charge-offs (48,171 ) (72,120 ) (85,880 ) Exchange gains (losses) in foreign currency 314 (680 ) 1,355 Balance at the end of the year Ps. 226,862 Ps. 195,078 Ps. 194,450

NON-CURRENT ASSETS HELD FOR SAL

NON-CURRENT ASSETS HELD FOR SALE	12 Months Ended
	Dec. 31, 2017
Disclosure of non-current assets held for sale [Abstract]
Disclosure of non-current assets held for sale and discontinued operations [text block]	NOTE 13 – NON-CURRENT ASSETS HELD FOR SALE The movement of the non-current assets held for sale during the years ended December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 259,527 Ps. 199,475 Ps. 211,247 Additions 89,216 236,632 93,698 Assets sold (78,784 ) (130,784 ) (104,940 ) Charge-offs - - (5,786 ) Changes in fair value (37,818 ) (34,572 ) (12,159 ) Reclassifications (1) (134,795 ) (5,631 ) (24,901 ) Exchange gains in foreign currency 4,036 (5,593 ) 42,316 Balance at year end Ps. 101,382 Ps. 259,527 Ps. 199,475 (1) Includes reclassifications to: I) II) III) Following is the detail of the non-current assets held for sale: December 31, December 31, Foreclosed assets Movable property Ps. 8,523 Ps. 103,569 Residential real estate 31,666 36,368 Other real estate 37,061 38,080 Ps. 77,250 Ps. 178,017 Assets received from leasing agreements Machinery and equipment 15,640 25,035 Vehicles 1,623 6,320 Real estate 1,963 27,208 Ps. 19,226 Ps. 58,563 Other non-current assets held for sale Lands - 8,396 Real estate 982 - Other 3,924 14,551 4,906 22,947 Balance Ps. 101,382 Ps. 259,527 Following is the detail of the associated liabilities to assets held for sale: December 31, 2017 December 31, 2016 Commercial accounts payable Ps. 18,382 Ps. 13,884 Total Ps. 18,382 Ps. 13,884 Non-current assets held for sale are primarily assets received through foreclosure from assets pledged as loan collateral. Accordingly, Grupo Aval´s intention is to sell them immediately, and it has departments, processes and special sales programs for that purpose. Foreclosed assets are either sold for cash or financing for their sale is provided to potential buyers under normal market conditions. These are expected to be sold within a period of 12 months subsequent to their classification as assets held for sale. There are options contracts in place for some of these assets. Note 4.1 on credit risk contains information on assets received through foreclosure and sold during the period. During the years ended on December 31, 2017, 2016 and 2015, there were no changes in plans for the disposal of non-current assets held for sale.

INVESTMENTS IN ASSOCIATES AND J

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES	12 Months Ended
	Dec. 31, 2017
Disclosure of investments in associates and joint ventures [Abstract]
Disclosure of investment in associates and joint ventures [Text Block]	NOTE 14 – INVESTMENTS IN ASSOCIATES AND JOINT VENTURES The detail of the investments in associates and joint ventures is as follows: December 31, December 31, Associates Ps. 925,823 Ps. 865,410 Joint ventures 117,191 281,237 Total Ps. 1,043,014 Ps. 1,146,647 The following table shows the balances of each investment in associates and joint ventures as of December 31, 2017 and 2016, Grupo Aval voting right percentage in those entities: December 31, 2017 December 31, 2016 Ownership Book Ownership Book Associates A.C.H Colombia S.A. 34 % Ps. 12,357 34 % Ps. 10,467 Redeban Multicolor S.A. 20 % 19,529 20 % 18,421 Credibanco (*) 25 % 196,071 25 % 192,893 Aerocali S.A. 50 % 17,633 50 % 24,971 Colombiana de Extrusión S.A. Extrucol 30 % 11,476 30 % 11,354 Concesionaria Tibitoc S.A. 33 % 20,165 33 % 20,209 Metrex S.A. 18 % 2,559 18 % 2,239 C.I. Acepalma S.A. (**) 11 % 5,625 11 % 4,367 Gases del Caribe S.A. E.S.P. 31 % 269,739 31 % 218,432 Gas Natural de Lima y Callao S.A. -Calidda S.A. 40 % 363,139 40 % 354,822 Energía Eficiente S.A. 39 % 6,927 39 % 6,678 Concentra Inteligencia en energía S.A.S 24 % 603 24 % 557 Ps. 925,823 Ps. 865,410 December 31, 2017 December 31, 2016 Ownership Book Ownership Book Joint ventures Cfc Sk Eldorado Latam Advisory Company S.A.S (1) 50 % 345 50 % 258 Cfc Sk El Dorado Latam Management Company Ltd (1) 50 % 4,568 50 % 2,993 Cfc Sk El Dorado Latam Capital Partner Ltd (1) 50 % 495 50 % 472 Cfc Sk El Dorado Latam Fund L.P. (1) - - 50 % 12,395 Concesionaria Ruta Del Sol S.A.S. (2) 33 % 111,783 33 % 252,474 Concesionaria Víal Del Pacífico (3) - - 50 % 1,479 Concesionaria Nueva Vía Al Mar (4) - - 60 % 11,166 Ps. 117,191 Ps. 281,237 (*) Since November 30, 2016, Grupo Aval has significant influence on Credibanco. Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate. (**) Grupo Aval has significant influence over C.I. Acepalma S.A. due to its participation in the Board of Directors. The main corporate purpose of Grupo Aval´s associates is described as follows: Associate Corporate purpose 1 A.C.H. Colombia S.A. Financial transactions 2 Redeban Multicolor S.A. Payment processing 3 Aerocali S.A Projects in airport infrastructure 4 Colombiana de Extrusión S.A. - Extrucol Networks and infrastructure 5 Concesionaria Tibitoc S.A. Infrastructure projects 6 Metrex S.A. Manufacturing and commercialization of industrial equipment 7 C.I. Acepalma S.A. Oil palm farming and subproducts 8 Gases del Caribe S.A. E.S.P. Gas distribution 9 Calidda S.A. Gas distribution 10 Concentra Inteligencia en energía S.A.S Gas distribution 11 Energía Eficiente S.A. Gas distribution 12 Credibanco S.A. Payment processing Below is the detail of the corporate purpose of significant joint ventures in concession agreements: (1) Different joint businesses executed by Grupo Aval’s subsidiaries with specific purposes wherein the joint business assumes no responsibilites for business results, not requiring significant equity resources from Grupo Aval. In June 2017 Cfc Sk El Dorado Latam Fund L.P. went from being a Joint venture to an investment in equity securities in the trading portfolio. (2) Estudios Proyectos del Sol S.A.S ("Episol"), 100% owned subsidiary of Corficolombiana S.A. carried out an impairment analysis on its investment in Concesionaria Ruta del Sol S.A.S (CRDS), a company in which it participates in 33% of its share capital, reflecting an adjustment in the amount of Ps.140,691 for 2017. The attribuitable part of the Episol (CRDS) adjustment amounted to Ps. 63,015.The balance of this investment after the impairment expense amounts to Ps.111,783. Matters referring to the nullity of the Ruta del Sol Sector 2 contract ("Concession Contract"), the claims of the parties, the Settlement Completion and Early Eventual Termination Agreement signed in February 2017, the liquidation formula of the Concession Contract, the liquidation value of the work and the amounts to be recognized are the subject of debate within the framework of the Arbitration Tribunal that will resolve the differences between CRDS and the Agencia Nacional de Infraestructura - ANI. Although no award has been made and no date is known for said award to be made, Episol considered it appropriate to make the aforementioned impairment expense on the value of its investment. Notwithstanding the foregoing, Episol will continue to defend its legitimate rights and interests in the aforementioned arbitration process, and in any other forum that may be required. (3) and (4) As of December 2017, the investment ceased to be a Joint Venture and became a subsidiary. (See note 17, this acquisition is considered non-significant). A roll-forward of investments in associates and joint ventures accounts is shown below for the years ended at December 31, 2017, 2016 and 2015: Associates December 31, December 31, December 31, Balance at the beginning of the year Ps. 865,410 Ps. 645,377 Ps. 540,082 Acquisitions - 16 - Gain in non-monetary transactions (*) - 195,514 - Participation in the profit or loss of the period 170,349 147,867 121,563 Participation in Other Comprehensive Income 1,135 (17,949 ) 30,426 Dividends received (107,812 ) (96,375 ) (39,188 ) Capitalization reductions - (4,746 ) Allowance for Impairment - (4,027 ) - Reclassifications - - (6,524 ) Exchange difference (3,259 ) (267 ) (982 ) Year-end balance Ps. 925,823 Ps. 865,410 Ps. 645,377 (*) Since November 30, 2016, Grupo Aval has significant influence on Credibanco. On August 26, 2016 Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate. Joint ventures December 31, December 31, December 31, Balance at the beginning of the year Ps. 281,237 Ps. 282,222 Ps. 177,103 Participation in the period profit or loss 1,615 (7,102 ) 108,835 Participation in Other Comprehensive Income (7 ) (2,112 ) 1,538 Dividends received - - (6,460 ) Capitalization 87 17,282 - Allowance for Impairment (*) (140,691 ) (5,892 ) - Transfers / Reclassification (12,405 ) (3,569 ) 1,206 Exchange difference - 408 - Balance acquired in business combination (12,645 ) - - Year-end balance Ps. 117,191 Ps. 281,237 Ps. 282,222 (*) Impairment of the investment in the Concesionaria Conjunto Ruta del Sol S.A.S joint businesses (CRDS). The condensed financial information of the associates and joint ventures is as follows: Associates December 31, 2017 Assets Liabilities Equity Income Expenses Net A.C.H. Colombia S.A. Ps. 56,670 Ps. 20,119 Ps. 36,551 Ps. 69,120 Ps. 54,746 Ps. 14,374 Redeban Multicolor S.A. 177,667 81,001 96,666 160,470 149,902 10,568 Credibanco 253,991 84,294 169,697 207,592 180,422 27,170 Aerocali S.A. 133,977 99,008 34,969 117,169 100,900 16,269 Colombiana de Extrusión S.A. Extrucol 68,059 29,807 38,252 65,870 62,201 3,669 Concesionaria Tibitoc S.A. 79,566 19,069 60,497 47,125 34,003 13,122 Metrex S.A. 38,933 24,726 14,207 47,763 43,003 4,760 C.I. Acepalma 290,406 240,547 49,859 798,782 789,925 8,857 Gases del Caribe S.A. 2,363,464 1,481,320 882,144 1,577,041 1,343,286 233,755 Cálidda S.A. 2,441,398 1,536,738 904,660 1,575,804 1,402,709 173,095 Concentra Inteligencia en energía S.A.S 2,331 231 2,100 1,634 1,491 143 Energía Eficiente S.A. 40,853 23,142 17,711 92,170 89,709 2,461 Ps. 5,947,315 Ps. 3,640,002 Ps. 2,307,313 Ps. 4,760,540 Ps. 4,252,297 Ps. 508,243 December 31, 2016 Assets Liabilities Equity Income Expenses Net A.C.H. Colombia S.A. Ps. 48,243 Ps. 17,282 Ps. 30,961 Ps. 59,991 Ps. 47,275 Ps. 12,716 Redeban Multicolor S.A. 161,093 69,912 91,181 132,626 127,020 5,606 Credibanco 365,559 212,085 153,474 203,214 184,342 18,872 Aerocali S.A. 146,783 96,841 49,942 130,743 104,850 25,893 Colombiana de Extrusión S.A. Extrucol 59,338 20,148 39,190 79,876 67,585 4,560 Concesionaria Tibitoc S.A. 88,521 27,894 60,627 53,212 37,063 16,149 Metrex S.A. 28,604 16,162 12,442 43,997 41,058 2,939 C.I. Acepalma 211,211 172,455 38,756 652,528 645,524 7,004 Gases del Caribe S.A. 2,197,142 1,460,303 736,838 1,818,142 1,627,786 190,356 Cálidda S.A. 2,230,186 1,343,129 887,057 1,630,979 1,462,514 168,465 Concentra Inteligencia en energía S.A.S 2,092 165 1,927 1,670 1,196 474 Energía Eficiente S.A. 41,643 25,045 16,598 500,311 491,584 8,728 Ps. 5,580,415 Ps. 3,461,421 Ps. 2,118,993 Ps. 5,307,289 Ps. 4,837,797 Ps. 461,762 Joint ventures December 31, 2017 Assets Liabilities Equity Income Expenses Net CFC SK Eldorado Latam Advisory Company S.A.S Ps. 893 Ps. 204 Ps. 689 Ps. 2,037 Ps. 1,877 Ps. 159 Cfc Sk Eldorado Latam Management Company Ltd. 9,169 34 9,135 3,584 374 3,210 Cfc Sk Eldorado Latam Capital Partners, Ltd. 1,007 16 991 - 131 (131 ) Concesionaria Vial del Pacífico (*) 424,888 424,379 509 113,113 115,567 (2,454 ) Concesionaria Nueva Vía al Mar (*) 188,731 166,955 21,776 26,215 23,049 3,166 Ps. 624,688 Ps. 591,588 Ps. 33,100 Ps. 144,949 Ps. 140,998 Ps. 3,950 (*) As of December 2017, the investment stopped being a Joint Venture and became a controlled investment. (See note 15, this acquisition is considered non-significant). December 31, 2016 Assets Liabilities Equity Income Expenses Net CFC SK Eldorado Latam Advisory Company S.A.S Ps. 1,015 Ps. 499 Ps. 516 Ps. 2,637 Ps. 2,265 Ps. 372 Cfc Sk Eldorado Latam Management Company Ltd. 6,026 39 5,987 3,003 381 2,622 Cfc Sk Eldorado Latam Capital Partners, Ltd. 960 15 945 (20 ) 152 (172 ) Cfc Sk Eldorado Latam Fund L.P. 37,545 12,582 24,963 1,953 9,655 (7,702 ) Concesionaria Ruta del Sol S.A. 3,653,227 2,578,230 1,074,997 1,499,983 1,207,910 292,073 Concesionaria Vial del Pacífico 246,184 243,221 2,963 61,275 61,506 (231 ) Concesionaria Nueva Vía al Mar 122,884 104,274 18,610 27,408 24,337 3,071 Ps. 4,067,841 Ps. 2,938,860 Ps. 1,128,981 Ps. 1,596,239 Ps. 1,306,206 Ps. 290,033

TANGIBLE ASSETS

TANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [abstract]
Disclosure of property, plant and equipment [text block]	NOTE 15 – TANGIBLE ASSETS The movement of the carrying value amounts of tangible assets for the years ended on December 31, 2017, 2016 and 2015 is as follows: For own Given in Investment Biological assets Total Cost Balance as of January 1, 2015 Ps. 6,758,740 Ps. 17,111 Ps. 366,742 Ps. 202,399 Ps. 7,344,992 Purchases or capitalized expenses 919,335 1,119 75,458 35,265 1,031,177 Withdrawals / Sales (349,056 ) (7,739 ) (22,945 ) (20,374 ) (400,114 ) Changes in fair value - - 104,769 22,922 127,691 Transfers to/from non-current assets held for sale 15,498 - 14,222 - 29,720 Adjustments for exchange differences 625,076 - - - 625,076 Balance as of December 31, 2015 Ps. 7,969,593 Ps. 10,491 Ps. 538,246 Ps. 240,212 Ps. 8,758,542 Reclassification of bearer plants balance (*) 188,177 - - (188,177 ) - Effects of amendments in accounting policies of bearer plants 29 - - (18,108 ) (18,079 ) Purchases or capitalized expenses 814,194 362 71,268 21,432 907,256 Withdrawals / Sales (367,987 ) (3,806 ) (61,786 ) (20,670 ) (454,249 ) Changes in fair value - - 53,680 14,644 68,324 Transfers to/from non-current assets held for sale (18,704 ) - 11,319 - (7,385 ) Adjustments for exchange differences (138,320 ) - - - (138,320 ) Reclassifications (58,046 ) - (2,539 ) (1,331 ) (61,916 ) Balance as of December 31, 2016 Ps. 8,388,936 Ps. 7,047 Ps. 610,188 Ps. 48,002 Ps. 9,054,173 Purchases or capitalized expenses 470,650 3,102 84,036 24,409 582,197 Withdrawals / Sales (4) (374,606 ) (2,467 ) (28,431 ) (19,775 ) (425,279 ) Changes in fair value - - 46,675 13,503 60,178 Transfers to/from non-current assets held for sale 587 - 101,469 - 102,056 Adjustments for exchange differences (65,404 ) - - - (65,404 ) Reclassifications (3) 77,394 - (30,143 ) - 47,251 Balance as of December 31, 2017 Ps. 8,497,557 Ps. 7,682 Ps. 783,794 Ps. 66,139 Ps. 9,355,172 Accumulated Depreciation: Balance January 1, 2015 Ps. (1,445,970 ) Ps. (9,237 ) Ps. - Ps. - Ps. (1,455,207 ) Depreciation for the year charged to profit or loss (388,271 ) (3,505 ) - - (391,776 ) Withdrawals / Sales 156,830 5,678 - - 162,508 Transfers to/from non-current assets held for sale (364,282 ) - - - (364,282 ) Adjustments for exchange differences (194,653 ) - - - (194,653 ) Balance December 31, 2015 Ps. (2,236,346 ) Ps. (7,064 ) Ps. - Ps. - Ps. (2,243,410 ) IAS 41 Adoption Effect – agriculture (29 ) (29 ) Depreciation for the year charged to profit or loss (454,620 ) (1,232 ) - - (455,852 ) Withdrawals / Sales 126,782 3,413 - - 130,195 Transfers to/from non-current assets held for sale 10,781 - - - 10,781 Adjustments for exchange differences 71,582 - - - 71,582 Reclassification (5,338 ) - - - (5,338 ) Balance December 31, 2016 Ps. (2,487,188 ) Ps. (4,883 ) Ps. - Ps. - Ps. (2,492,071 ) Depreciation of the year charged against profit or loss (463,133 ) (759 ) - - (463,892 ) Withdrawals / Sales (4) 274,804 2,036 - - 276,840 Transfers to/from non-current assets held for sale - - - - - Adjustments for exchange differences 20,881 - - - 20,881 Reclassification (3) (35,531 ) - - - (35,531 ) Balance December 31, 2017 Ps. (2,690,167 ) Ps. (3,606 ) Ps. - Ps. - Ps. (2,693,773 ) Impairment losses: Balance as of January 1, 2015 Ps. (2,726 ) Ps. (326 ) Ps. - Ps. - Ps. (3,052 ) Year impairment charge 1,709 259 - - 1,968 Balance as of December 31, 2015 (1,017 ) (67 ) - - (1,084 ) Year impairment charge (1,482 ) (21 ) - - (1,503 ) Balance as of December 31, 2016 (2,499 ) (88 ) - - (2,587 ) Withdrawals / Year impairment charge (4,894 ) 88 - - (4,806 ) Balance as of December 31, 2017 Ps. (7,393 ) Ps. - Ps. - Ps. - Ps. (7,393 ) Tangible Assets, net: Balance as of December 31, 2015 Ps. 5,732,230 Ps. 3,360 Ps. 538,246 Ps. 240,212 Ps. 6,514,048 Balance as of December 31, 2016 Ps. 5,899,249 Ps. 2,076 Ps. 610,188 Ps. 48,002 Ps. 6,559,515 Balance as of December 31, 2017 Ps. 5,799,997 Ps. 4,076 Ps. 783,794 Ps. 66,139 Ps. 6,654,006 (*) See note 2.15 (1) Only includes assets for own use diferent than assets given in operating lease (see note 15.2) (2) The total of purchases of investment properties, includes Ps. 8,219 at December 2017 and Ps. 14,658 at December 2016, of assets received in total or partial settlement of the payment obligations of debtors. (3) The total of reclassification of for own use, includes Ps. 3,509 of the business combinations Covimar y Covipacifico (this acquisition is not significant). (4) The total of Withdrawals of for own use, includes Ps. (30,440) of the liquidation of “Consorcio Consol”. 15.1. Properties, plant and equipment for own use Following is the detail of the balance at December 31, 2017 and 2016, by type: Cost Accumulated Impairment Carrying December 31, 2017 Land Ps. 1,007,788 Ps. - Ps. (3,741 ) Ps. 1,004,047 Buildings 2,640,644 (485,924 ) (116 ) 2,154,604 Office equipment and accessories 944,127 (613,400 ) (226 ) 330,501 Information technology equipment 1,573,284 (1,121,179 ) (11 ) 452,094 Vehicles 131,301 (62,304 ) - 68,997 Equipment and machinery 1,362,242 (187,500 ) (3,299 ) 1,171,443 Silos 8,613 (4,760 ) - 3,853 Warehouses 43,592 (25,734 ) - 17,858 Advanced payments for the acquisition of plant property and equipment 6,974 - - 6,974 Improvements in leaseholds properties 348,431 (182,318 ) - 166,113 Construction in progress 211,120 - - 211,120 Bearer plants 219,441 (7,048 ) - 212,393 Balance as of December 31, 2017 Ps. 8,497,557 Ps. (2,690,167 ) Ps. (7,393 ) Ps. 5,799,997 Cost Accumulated Impairment Carrying December 31, 2016 Land Ps. 1,010,753 Ps. - Ps. (1,452 ) Ps. 1,009,301 Buildings 2,598,571 (396,015 ) (213 ) 2,202,343 Office equipment and accessories 939,344 (600,743 ) (72 ) 338,529 Information technology equipment 1,555,655 (1,086,475 ) - 469,180 Vehicles 130,493 (69,282 ) - 61,211 Equipment and machinery 1,352,413 (150,677 ) (762 ) 1,200,974 Silos 8,613 (4,445 ) - 4,168 Warehouses 43,457 (24,819 ) - 18,638 Advanced payments for the acquisition of plant property and equipment 17,455 - - 17,455 Improvements in leaseholds properties 307,289 (152,067 ) - 155,222 Construction in progress 225,803 - - 225,803 Bearer plants 199,090 (2,665 ) - 196,425 Balance as of December 31, 2016 Ps. 8,388,936 Ps. (2,487,188 ) Ps. (2,499 ) Ps. 5,899,249 15.2 Properties, plant and equipment given in operating lease: Following is movement of carrying value amounts of the balance to as of December 31, 2017 and 2016, by type: Cost Accumulated Impairment Carrying December 31, 2017 Equipment, furniture and office equipment Ps. 203 Ps. (203 ) Ps. - Ps. - Computing equipment 3,363 (1,484 ) - 1,879 Vehicles 3,627 (1,834 ) - 1,793 Mobilization equipment and machinery 489 (85 ) - 404 Balance as of December 31, 2017 Ps. 7,682 Ps. (3,606 ) Ps. - Ps. 4,076 Cost Accumulated Impairment Carrying December 31, 2016 Equipment, furniture and office equipment Ps. 264 Ps. (264 ) Ps. - Ps. - Computing equipment 1,838 (1,712 ) (88 ) 38 Vehicles 3,876 (1,968 ) - 1,908 Mobilization equipment and machinery 1,069 (939 ) - 130 Balance as of December 31, 2016 Ps. 7,047 Ps. (4,883 ) Ps. (88 ) Ps. 2,076 Below is a summary of the minimum lease payments to be received in the next years based on assets given in operating lease to December 31, 2017 and 2016: December 31, December 31, Less than a year Ps. 2,833 Ps. 1,937 More than a year, less than 5 2,435 1,170 Total Ps. 5,268 Ps. 3,107 15.3 Biological Assets Following is the detail of the biological assets by type: December 31, December 31, African palm In production (at fair value) Ps. 26,555 Ps. 22,814 Rubber plantations In production (at fair value) 24,158 14,605 Other at fair value (*) 15,426 10,583 Total Ps. 66,139 Ps. 48,002 (*) Includes short-term crops, livestock and fish farming. The aforementioned amounts are not subject to any limitations or restrictions. During the years ended on December 31, 2017, 2016 and 2015, Grupo Aval recorded in its statement of income the following: December 31, December 31, December 31, Sales of biological goods Ps. 43,788 Ps. 39,032 Ps. 46,458 Changes in fair value of biological assets 13,503 14,644 22,922 Subtotal 57,291 53,676 69,380 Costs and expenses (37,313 ) (27,067 ) (37,045 ) Depreciation of bearer plants (3,405 ) (2,665 ) - General administration costs and sales (7,278 ) (4,379 ) (2,866 ) Financial costs (4,136 ) (2,285 ) (278 ) Subtotal (52,132 ) (36,396 ) (40,189 ) Total net income Ps. 5,159 Ps. 17,280 Ps. 29,191 15.4 Investment properties The following table summarizes investment properties as of December 31, 2017 and 2016: December 31, 2017 Cost Accumulated Carrying amount Land Ps. 365,675 Ps. 159,836 Ps. 525,511 Buildings 217,897 40,386 258,283 Balance as of December 31, 2017 Ps. 583,572 Ps. 200,222 Ps. 783,794 December 31, 2016 Cost Accumulated Carrying amount Land Ps. 267,869 Ps. 123,287 Ps. 391,156 Buildings 189,650 29,382 219,032 Balance as of December 31, 2016 Ps. 457,519 Ps. 152,669 Ps. 610,188 The following amounts have been recognized in the consolidated statement of income during the years ended on December 31, 2017, 2016 and 2015 in relation to investments properties: December 31, December 31, December 31, Income from rents Ps. 11,992 Ps. 5,183 Ps. 6,986 Direct operating expenses deriving from property investments which create income from rent (1,053 ) (321 ) (1,798 ) Direct operating expenses deriving from property investments which do not create income from rent (4,239 ) (1,328 ) (762 ) Net Ps. 6,700 Ps. 3,534 Ps. 4,426

CONCESSION ARRANGEMENTS RIGHTS

CONCESSION ARRANGEMENTS RIGHTS	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about service concession arrangements [abstract]
Disclosure of service concession arrangements [text block]	NOTE 16 – CONCESSION ARRANGEMENTS RIGHTS Under IFRIC 12, the concession arrangements between several of Grupo Aval’s subsidiaries and the Colombian Government for a number of infrastructure projects are classified as either financial assets or intangible assets as follows: 16.1. Financial assets in concession arrangements The following table shows the changes in the financial assets in concession arrangements registered for Grupo Aval’s subsidiaries in the years ended at December 31, 2017 and 2016: At fair value At amortized cost Total Balance at January 1, 2015 Ps. 1,738,598 Ps. 119,337 Ps. 1,857,935 Additions or new concession arrangements - 369,983 369,983 Collections during the year - (400,703 ) (400,703 ) Adjustment to fair value credited to income 153,094 - 153,094 Changes in accounting estimates (1) - (111,432 ) (111,432 ) Accrued interest - 65,679 65,679 Balance at December 31, 2015 Ps. 1,891,692 Ps. 42,864 Ps. 1,934,556 Additions or new concession arrangements - 408,040 408,040 Collections during the year - (327,607 ) (327,607 ) Adjustment to fair value credited to income 180,982 - 180,982 Accrued interest - 79,944 79,944 Balance at December 31, 2016 Ps. 2,072,674 Ps. 203,241 Ps. 2,275,915 Additions or new concession arrangements (2) - 698,749 698,749 Collections during the year - (162,271 ) (162,271 ) Adjustment to fair value credited to income 209,937 - 209,937 Accrued interest - 46,299 46,299 Balance at December 31, 2017 Ps. 2,282,611 Ps. 786,018 Ps. 3,068,629 (1) During 2015, the subsidiaries Estudios, Proyectos e Inversiones de los Andes S.A. and Proyectos de Infraestructura S.A. reassessed the allocation of the fair value of two mixed concession contracts, between the financial asset and the intangible asset that arise from the contract, as a result of clarifications made to the contracts due to requirements for additional work. As a result, it was determined to perform an adjustment to their carrying amount by a reclassification of the amount of Ps. 111,432 from the financial assets at amortized cost included in other accounts receivable, to intangible assets. (2) The Corporación Financiera Colombiana - Corficolombiana S.A., acquired an additional 40% of the Concesionaria Vial del Pacífico S.A.S. and an additional 40% of the Concesionaria Nueva Vía al Mar S.A.S., both domiciled in Colombia, increasing amortized cost in Ps. 396,467 (this acquisition is considered non-significant). 16.2. Intangible Assets in Concession Arrangements The following table shows the a roll-forward of in the main concession agreements of Grupo Aval’s subsidiaries under intangible assets during the years ended at December 31, 2017, 2016 and 2015: Promigas S.A. Concesionaria Proyectos de Episol S.A.S. Total Cost At December 31, 2015 Ps. 1,884,476 Ps. 554,037 Ps. 262,406 Ps. 72,391 Ps. 2,773,310 Additions 421,202 96,621 11,150 83,206 612,179 Reclassification to PPE 68,587 - 3 1 68,591 Withdrawals / Sales (4,334 ) (17 ) - - (4,351 ) At December 31, 2016 Ps. 2,369,931 Ps. 650,641 Ps. 273,559 Ps. 155,598 Ps. 3,449,729 Additions 193,489 82,629 29,305 305,486 610,909 Reclassification to PPE (14,408 ) - - - (14,408 ) Withdrawals / Sales (1,915 ) (1,590 ) - - (3,505 ) Foreign exchange adjustment (1,041 ) - - - (1,041 ) At December 31, 2017 Ps. 2,546,056 Ps. 731,680 Ps. 302,864 Ps. 461,084 Ps. 4,041,684 Accumulated Amortization At December 31, 2015 (149,743 ) Ps. (210,657 ) Ps. (18,971 ) Ps. (3,237 ) Ps. (382,608 ) Amortization of the year (100,850 ) (148,749 ) (9,485 ) (1,583 ) (260,667 ) Reclassification to PPE (2,111 ) - (2 ) - (2,113 ) Withdrawals / sales 973 - - - 973 At December 31, 2016 Ps. (251,731 ) Ps. (359,406 ) Ps. (28,458 ) Ps. (4,820 ) Ps. (644,415 ) Amortization of the year (119,549 ) (153,212 ) (10,083 ) (1,645 ) (284,489 ) Reclassification to PPE 841 - - - 841 Withdrawals / sales 630 - - - 630 Foreign exchange adjustment (84 ) - - - (84 ) At December 31, 2017 Ps. (369,893 ) Ps. (512,618 ) Ps. (38,541 ) Ps. (6,465 ) Ps. (927,517 ) Total Intangible Assets Balance at December 31, 2015 Ps. 1,734,733 Ps. 343,380 Ps. 243,435 Ps. 69,154 Ps. 2,390,702 Cost 485,455 96,604 11,153 83,207 676,419 Amortization (101,988 ) (148,749 ) (9,487 ) (1,583 ) (261,807 ) Balance at December 31, 2016 Ps. 2,118,200 Ps. 291,235 Ps. 245,101 Ps. 150,778 Ps. 2,805,314 Cost 176,125 81,039 29,305 305,486 591,955 Amortization (118,162 ) (153,212 ) (10,083 ) (1,645 ) (283,102 ) Balance at December 31, 2017 Ps. 2,176,163 Ps. 219,062 Ps. 264,323 Ps. 454,619 Ps. 3,114,167 The following is a summary of the main concession contracts granted to subsidiaries of Grupo Aval and to Promigas as of December 31, 2017 and 2016: Concession Concession end date Price control and regulation by concession grantor Remuneration paid by Grant or guarantee from concession grantor Residual value Promigas S.A. and Subsidiaries (*) Pipeline construction and maintenance in Colombia 2044 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value. Pipeline construction and maintenance in Colombia 2045 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value Pipeline construction in Colombia 2047 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value Pipeline construction and maintenance in Perú 2035 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value Pipeline construction and maintenance in Colombia 2026 - 2044 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value Pipeline construction and maintenance in Colombia 2034 - 2045 Regulated gas transportation tariffs Users None Colombian Government has an option to buy the Infrastructure at any time at its fair value Electrical network construction and maintenance in Colombia 2035 Regulated electric energy transmission tariffs Users Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Pipeline construction and maintenance in Perú 2034 Regulated gas transportation tariffs Users Letter commitment Infrastructure returned to grantor for no consideration at end of contract Estudios, Proyectos e Inversiones de los Andes S.A.S. - Epiandes Motorways constructions and maintenance in Colombia 2019 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Proyectos de Infraestructura S.A. - PISA and Subsidiaries Motorways constructions and maintenance in Colombia 2033 Regulated toll tariffs Users Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Motorways constructions and maintenance in Colombia 2024 Regulated toll tariffs Users plus short falls paid by Colombian Government Infrastructure returned to grantor for no consideration at end of contract Estudios y Proyectos Del Sol S.A.S and Subsidiaries - EPISOL Motorways constructions and maintenance in Colombia 2042 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Motorways constructions and maintenance in Colombia 2054 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Motorways constructions and maintenance in Colombia 2035 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Concesionaria Nueva Vía al Mar S.A.S Motorways constructions and maintenance in Colombia 2044 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract Concesionaria Vial Del Pacifico S.A.S Motorways constructions and maintenance in Colombia 2042 Regulated toll tariffs Users plus cost short falls paid by Colombian Government according to the contract Compliance insurance polices Infrastructure returned to grantor for no consideration at end of contract (*) 16.3. Additional information about Concession Contracts that are in construction arrangements The following is the activity of income and costs incurred in the construction stage of the concession arrangements: Accumulated income recorded in the income statement Promigas S.A. Concesionaria Vial Proyectos de Episol S.A.S. Concesionaria Concesionaria Total Balance at January 1, 2015 318,699 229,729 - 80,042 - - 628,470 Income from concession contracts during the period 52,507 480,901 13,874 50,353 - - 597,635 Income from toll during the period - 230,348 197,648 - - - 427,995 Administration, Operation and maintenance (AOM) fees during the period - - - 4,401 - - 4,401 Financial income during the period 153,093 63,563 4 - - 216,660 Movement during the period 205,600 774,811 211,522 54,758 - - 1,246,691 Balance at December 31, 2015 Ps. 524,299 Ps. 1,004,540 Ps. 211,522 Ps. 134,800 Ps. - Ps. - Ps. 1,875,161 Income from concession contracts during the period 583,018 334,762 77,466 150,147 - - 1,145,393 Income from toll during the period - 215,319 213,294 73,922 - - 502,535 Administration, Operation and maintenance (AOM) fees during the period - - - 37,436 - - 37,436 Financial income during the period 180,982 - - - - - 180,982 Adjustment for interest during the period - 68,237 - 3,351 - - 71,588 Movement during the period Ps. 764,000 Ps. 618,318 Ps. 290,760 Ps. 264,856 Ps. - Ps. - Ps. 1,937,934 Balance at December 31, 2016 Ps. 1,288,299 Ps. 1,622,858 Ps. 502,282 Ps. 399,656 Ps. - Ps. - Ps. 3,813,095 Income from concession contracts during the period 193,185 217,954 51,939 413,203 104 63,149 939,534 Income from toll during the period - 236,790 228,643 40,841 - - 506,274 Administration, Operation and maintenance (AOM) fees during the period - - - 67,468 919 - 68,387 Financial income during the period 209,936 - - - - - 209,936 Adjustment for interest during the period - 24,439 - 20,780 1,080 - 46,299 Movement during the period Ps. 403,121 Ps. 479,183 Ps. 280,582 Ps. 542,292 Ps. 2,103 Ps. 63,149 Ps. 1,770,430 Balance at December 31, 2017 Ps. 1,691,420 Ps. 2,102,041 Ps. 782,864 Ps. 941,948 Ps. 2,103 Ps. 63,149 Ps. 5,583,525 Costs incurred in the concession, recorded in the statement of income Promigas S.A. Concesionaria Vial Proyectos de Episol S.A.S. Concesionaria Concesionaria Total Balance at January 1, 2015 160,772 219,083 - - - - 379,855 Construction cost incurred during the period 52,507 480,901 13,874 - - - 547,282 Financial cost incurred during the period 771 38,022 - - - - 38,793 Movement during the period 53,278 518,923 13,874 - - - 586,075 Balance at December 31, 2015 Ps. 214,050 Ps. 738,006 Ps. 13,874 Ps. - Ps. - Ps. - Ps. 965,930 Construction cost incurred during the period 583,018 334,762 77,466 150,147 - - 1,145,393 Financial cost incurred during the period 2,398 37,793 - - - - 40,191 Movement during the period Ps. 585,416 Ps. 372,555 Ps. 77,466 Ps. 150,147 Ps. - Ps. - Ps. 1,185,584 Balance at December 31, 2016 Ps. 799,466 Ps. 1,110,561 Ps. 91,340 Ps. 150,147 Ps. - Ps. - Ps. 2,151,514 Construction cost incurred during the period 193,185 209,055 51,939 214,105 104 11,993 680,381 Financial cost incurred during the period 3,308 - - 39,388 4,908 - 47,604 Movement during the period Ps. 196,493 Ps. 209,055 Ps. 51,939 Ps. 253,493 Ps. 5,012 Ps. 11,993 Ps. 727,985 Balance at December 31, 2017 Ps. 995,959 Ps. 1,319,616 Ps. 143,279 Ps. 403,640 Ps. 5,012 Ps. 11,993 Ps. 2,879,499

GOODWILL

GOODWILL	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about goodwill [Abstract]
Disclosure of goodwill [text block]	NOTE 17 – GOODWILL Following is the roll-forward of goodwill balances during the years ended December 31, 2017 and 2016: December 31, 2017 December 31, 2016 Balance at the beginning of the year Ps. 6,824,935 Ps. 7,055,975 Additions / Purchases (1) 102,376 2,805 Foreign exchange adjustment (26,255 ) (233,845 ) Balance at the end of the year Ps. 6,901,056 Ps. 6,824,935 (1) Corficolombiana acquired in 2017 an additional 40 % of the Concesionaria Vial del Pacífico – Covipacífico S.A.S., located in Colombia. The business acquisition generated Goodwill of Ps. 102,376 which was included in the Financial Statements of Grupo Aval at the end of the 2017 accounting period. (this acquisition is considered non-significant) The following is the detail of goodwill assigned by cash generating units (CGU) representing the lowest identifiable level within Grupo Aval and monitored by management, in addition those are not greater than the identified business’ segments: December 31, 2017 CGU Goodwill CGU Book CGU Excess Leasing Bogotá Panamá Ps. 4,688,362 Ps. 11,349,292 Ps. 17,054,833 Ps. 5,705,541 Inside Banco de Bogotá S.A. (Megabanco) 465,905 7,353,562 9,483,254 2,129,692 Promigas S.A and Subsidiaries 169,687 3,653,698 9,392,266 5,738,568 Concesionaria Panamericana S.A.S 119,916 169,451 261,223 91,772 Concesionaria Covipacífico S.A.S. (1) 102,376 104,600 111,026 6,426 Hoteles Estelar S.A 6,661 98,688 179,420 80,732 Inside Banco de Occidente S.A. (Banco Unión) 22,724 2,648,449 2,878,178 229,729 Banco Popular S.A. 358,401 2,710,218 3,316,807 606,589 Banco de Bogotá S.A. 301,222 11,000,669 15,361,349 4,360,680 Banco de Occidente S.A. 127,571 3,174,228 4,394,187 1,219,959 Sociedad Administradora de Pensiones y Cesantías Porvenir S.A. 538,231 2,888,669 9,610,514 6,721,845 6,901,056 (1) Corresponds to 40% of the Consesionaria Vial del Pacífico – Covipacífico S.A.S. (this acquisition is considered as non-significant) December 31, 2016 CGU Goodwill CGU Book CGU Excess Leasing Bogotá Panamá Ps. 4,714,617 Ps. 10,428,240 Ps. 14,362,910 Ps. 3,934,670 Inside Banco de Bogotá S.A. (Megabanco) 465,905 5,579,593 9,976,659 4,397,066 Promigas S.A and Subsidiaries 169,687 2,785,270 7,089,387 4,304,116 Concesionaria Panamericana S.A.S 119,916 35,585 370,248 334,663 Hoteles Estelar S.A 6,661 90,794 97,956 7,162 Inside Banco de Occidente S.A. (Banco Union) 22,724 41,935 454,906 412,971 Banco Popular S.A. 358,401 2,624,196 3,541,307 917,111 Banco de Bogotá S.A. 301,222 10,331,548 13,708,171 3,376,623 Banco de Occidente S.A. 127,571 3,089,717 4,168,844 1,079,127 Sociedad Administradora de Pensiones y Cesantías Porvenir S.A. 538,231 2,433,816 9,187,043 6,753,227 6,824,935 The recoverable amount of each cash generating unit was determined based on market values of banks, listed in stock exchanges and a recoverable amount is determined by a study for those not listed in stock exchanges. Such calculations used cash flow projections approved by management, covering periods from 5 to 20 years. Cash flows subsequent to these periods were extrapolated using estimated growth rates for such flows, not exceeding the average of the economic sector where the cash generating unit operates. Below is a detail of the most significant values that comprise Goodwill, representing more than 80% of the Goodwill balance detailed above. A. Leasing Bogotá S.A. Panamá On December 9, 2010, Banco de Bogotá S.A. acquired control of BAC Credomatic Inc (BAC COM) through its subsidiary Leasing Bogotá S.A. Panamá (LBP), which is the Panamanian company that executed the purchase agreement. BAC Credomatic Inc. (BAC COM), a company incorporated to do business under the laws of the British Virgin Islands, is the owner of Banco BAC International Bank, Inc. and the operations of BAC Credomatic Inc. (BAC) in Central America. With the acquisition of BAC COM, through LBP, BAC's corporate structure now is controlled by Banco de Bogotá S.A., which is controlled, in turn, by Grupo Aval. Goodwill was generated and recognized as a result of that operation. Banco de Bogotá was authorized by the Superintendency of Finance to make this acquisition, through its subsidiary Leasing Bogotá Panamá, as indicated in Official Notice 2010073017- 048 dated December 3, 2010. Afterwards, ninety-eight point ninety-two percent (98.92%) of the shares of Banco Bilbao Vizcaya Argentaria S.A. Panamá (BBVA Panamá, now BAC de Panamá) were acquired by Banco de Bogotá, through its subsidiary Leasing Bogotá Panamá, under authorization from the Superintendency of Finance, as per Official Notice 2013072962-052 dated December 12, 2013. Also, one hundred percent (100.00%) of the shares of Banco Reformador de Guatemala (Reformador) and of Transcom Bank Limited in Barbados (Transcom) were acquired, and both banks were stated as Grupo Financiero Reformador de Guatemala. The Superintendency of Finance authorized Banco de Bogotá to acquire these banks, through its subsidiaries Credomatic International Corporation and BAC Credomatic Inc., as per Official Notice 2013068082-062 dated December 3, 2013. Finally, during 2015, Credomatic International Corporation, a subsidiary of the company, acquired 100% of the issued and outstanding shares of COINCA Corporation Inc. (COINCA) and Corporación Tenedora BAC Credomatic S.A., and an indirect subsidiary of the Company, acquired 100% of the issued and outstanding shares of Medios de Pago MP S.A., domiciled in Costa Rica, generating with the latter an additional capital gain of Ps. 853,401 that was included in the consolidated financial statements of the Bank in the first quarter of 2016. The latest valuation update for the groups of cash generating units to which this goodwill was allocated was done by an external adviser and reviewed by Management in January 2018, based on the financial statements of BAC Credomatic at September 30, 2017. The conclusion was that there are no situations that imply a possible impairment, given that the recoverable amount of the groups of cash generating units that have goodwill allocated for Ps. 17,054,833 exceeds the book value on Ps. 5,705,541. The following table shows the averages of the primary premises used in the reports on impairment of the cash-generating units with allocated goodwill, based on the impairment assessments done on the indicated dates. Although the valuation exercise includes a 10 year projection, the following tables only show the first 5 years as, following the first year of projection, rates are generally stable with no significant variations. December 31, 2017 2018 2019 2020 2021 2022 Lending rate on the loan portfolio and investments 11.0 % 11.0 % 11.0 % 11.0 % 11.1 % Borrowing rate 2.7 % 2.8 % 2.9 % 3.0 % 3.0 % Growth in income from commissions 6.5 % 8.3 % 8.2 % 8.2 % 8.3 % Growth in expenses 6.1 % 6.2 % 6.7 % 6.7 % 6.8 % Discount rate after taxes 11.3 % Growth rate after ten years 3.0 % December 31, 2016 2017 2018 2019 2020 2021 Lending rate on the loan portfolio and investments 10.8 % 10.8 % 10.8 % 10.8 % 10.9 % Borrowing rate 3.0 % 3.0 % 3.0 % 3.0 % 3.0 % Growth in income from commissions 3.9 % 5.6 % 6.6 % 5.7 % 6.5 % Growth in expenses 5.8 % 7.4 % 7.1 % 6.8 % 6.2 % Discount rate after taxes 13.2 % Growth rate after ten years 3.0 % A 10-year projection was made to evaluate goodwill impairment, considering the business will have matured and the flow of funds will have stabilized once this period has elapsed. In turn, macroeconomic assumptions as well as those for BAC Credomatic’s business in each of the countries where it operates were used for the projection, so as to reflect the reality that each market provides to the CGUs as a whole. The averages of the main premises used are listed in the foregoing tables, including the variables for all the countries where BAC Credomatic Inc. operates. The following is description of that process: · Lending rates on loans and investments were projected based on historical data and on the expectations of management in each of the countries where BAC Credomatic Inc. operates, considering the competitiveness of the different services in their respective markets and the growth strategies for each segment. The projection on US Federal Reserve rates was taken into account as well, since these rates serve as a basis for international banking rates. · Growth in income from commissions was projected in line with the growth active portfolio, which allows to impel a greater capture of income through the products and services like insurances, memberships, commissions of exchange, among others, also the implementation of new services. Competitive markets were also considered as the projected time horizon elapsed. · Although the functional or reporting currency of the business is that of each country in the region where BAC Credomatic Inc. subsidiaries operate, the future flows of funds have been converted into nominal U.S. dollars in each projected period, discounted at a nominal rate in U.S. dollars, net of income tax, estimated as "Ke". A discount rate in U.S. dollars is used, given that a consistent discount rate in the respective local currencies cannot be estimated because of the lack of necessary data. · The discount rate has been estimated in light of the risk profile of each of the markets where BAC Credomatic inc. operates. · To estimate the terminal value, the normalized flow of funds, adjusted according to expectations for its growth, was projected in perpetuity. This projection does not exceed the average long-term rate of growth for the economies in each of the countries where BAC operates. Consequently, an annual growth rate of 3% was estimated for the long term. The discount rate after taxes used to discount the dividend flows reflects the specific risks relative to the CGU and the markets where BAC Credomatic operates, as mentioned earlier. Had the estimated 11.3% discount rate been 1.0% higher than the estimated rate; it would not have been necessary to reduce the book value of goodwill, since the vale-in-use of the cash-generating units to which the goodwill was allocated would be Ps. 14,510,903, still exceeding book value as of December 31, 2017 of Ps. 11,349,292. B. Cash-generating units inside Banco de Bogotá Goodwill was generated in 2006 with the acquisition of 94.99% of the shares of Banco de Crédito y Desarrollo Social – MEGABANCO S.A. and later merged with Banco de Bogotá. This operation was authorized by the Office of the Superintendency of Finance in Resolution No. 917 dated June 2, 2006. That goodwill was allocated to the groups of cash-generating units inside Banco de Bogotá involved in the following lines of business: Share (%) Value Commercial 32.7 % 152,539 Consumer 30.8 % 143,287 Payroll installment loans 27.0 % 125,934 Vehicles 6.7 % 31,304 Microcredit 2.8 % 12,841 Total 100.0 % 465,905 The latest valuation update for the business lines of the groups of cash-generating units to which this goodwill was allocated, was done by an external adviser. This valuation was conducted on January 2018 and is based on Banco de Bogotá´s financial statements at September 30, 2017. Due to the merger of Banco de Bogotá with the acquired company, no triggering event was detected. It was concluded that there are no situations that imply a possible impairment, given that the recoverable amount of the groups of cash generating units that have goodwill allocated for Ps. 9,483,254 exceeds the book value on Ps. 2,129,692. The following table shows the main premises used in the latest impairment tests of the groups of cash-generating units with allocated goodwill. These were performed in December 2017 and December 2016 December 31, 2017 2018 2019 2020 2021 2022 Lending rate on the loan portfolio and investments 9.6 % 9.4 % 9.3 % 9.5 % 9.6 % Borrowing rate 3.6 % 3.3 % 3.2 % 3.6 % 3.8 % Growth in income from commissions 9.2 % 7.7 % 7.8 % 8.5 % 8.5 % Growth in expenses 2.5 % 4.0 % 4.0 % 5.1 % 4.4 % Inflation 3.3 % 3.4 % 3.2 % 3.3 % 3.6 % Discount rate after taxes 14.0 % Growth rate after five years 3.5 % December 31, 2016 2017 2018 2019 2020 2021 Lending rate on the loan portfolio and investments 10.5 % 10.0 % 9.6 % 9.2 % 9.0 % Borrowing rate 4.7 % 4.1 % 3.7 % 3.2 % 3.2 % Growth in income from commissions 17.2 % 21.3 % 12.2 % 12.2 % 15.6 % Growth in expenses 7.0 % 10.8 % 10.8 % 11.0 % 12.7 % Inflation 4.1 % 3.0 % 3.1 % 3.0 % 3.0 % Discount rate after taxes 15.7 % Growth rate after five years 3.0 % A 5-year projection was made to estimate goodwill, based on macroeconomic assumptions and those related to the businesses listed in the foregoing tables. The following is a description of that process. · The lending rates on loans and investments were projected based on the Company expected rates and lending rates from independent specialists (The Economist Intelligence Unit "EIU") · The borrowing rates were projected based on The Company expected rates and the money market interest rate from EIU. · Estimated growth in commissions is based on its historical percentage over the gross loan portfolio. · Estimated growth in expenses is based on the inflation's growth and/or its historical percentage over revenues. · The inflation rate used in the projections is based on reports from outside sources, such as The Economist Intelligence Unit, and Corficolombiana. · The growth rate used for the terminal value was 3.5%, which is the average projected inflation provided by the independent specialists. The discount rate after taxes used to discount dividend flows reflects the specific risks relative to each cash-generating unit. If the 14.0% estimated discount rate had been 1.0% higher than the rate estimated in the independent studies, the book value of goodwill would not have to be reduced, since the fair value of the groups of cash-generating units with this sensitivity would be Ps. 8,724,594, which is above the book value of Ps. 7,353,562 as of December 31, 2017. C. Sociedad Administradora de Fondos de Pensiones y Cesantías Porvenir S.A. After the acquisition, Porvenir absorbed AFP Horizonte Pensiones y Cesantías S.A and the goodwill in question was allocated to the groups of cash-generating units that together make up Porvenir later that same year. The latest valuation update for the business lines of the groups of cash-generating units to which this goodwill was allocated, was done by an external adviser. This valuation was conducted on January 2018 and is based on financial statements of Porvenir at September 30, 2017. The conclusion was that there are no situations that imply a possible impairment, given that the recoverable amount of the groups of cash generating units that have goodwill allocated for Ps. 9,610,514 exceeds the book value on Ps. 6,721,845. The following are the main premises used in the impairment test reports taken as the basis for impairment testing on the dates listed, although the valuation exercise includes a 20 year projection, the following tables only show the first 5 years as, following the first year of projection, rates are generally stable with no significant variations. December 31, 2017 2018 2019 2020 2021 2022 Interest rate on investments 5.8 % 5.9 % 5.7 % 5.8 % 6.2 % Borrowing rate 6.3 % 6.3 % 6.3 % 6.3 % 6.3 % Growth in income from commissions 14.2 % 8.0 % 7.7 % 7.6 % 7.5 % Growth in expenses 11.2 % 6.7 % 6.1 % 6.1 % 6.4 % Inflation 3.3 % 3.4 % 3.2 % 3.3 % 3.6 % Discount interest rate after taxes 13.0 % Growth rate after twenty years 3.5 % December 31, 2016 2017 2018 2019 2020 2021 Lending interest rate on investments 6.5 % 5.9 % 6.2 % 6.2 % 6.2 % Borrowing rate 6.3 % 6.3 % 6.3 % 6.3 % 6.3 % Growth in income from commissions 6.9 % 12.7 % 7.2 % 7.1 % 6.9 % Growth in expenses 3.5 % 13.2 % 5.3 % 6.5 % 5.9 % Inflation 3.7 % 3.0 % 3.1 % 3.0 % 3.0 % Discount interest rate after taxes 12.9 % Growth rate after twenty years 4.0 % A 20-year projection was made to estimate goodwill based on macroeconomic assumptions and those related to the business of Porvenir, as indicated in the foregoing tables. The following is a description of that process. · Investments and borrowing rates were projected using historical data and data provided by The Company on the business. · The estimated increases in commissions and expenses are based on business growth and other transactions estimated by The Company. · The inflation rate used in the projections is based on reports from outside sources, such as The Economist Intelligence Unit, and Corficolombiana. · The growth rate used for the terminal value was 3.5%, which is the average projected inflation provided by the independent specialists. The discount interest rate after taxes that was used to discount dividend flows reflects the specific risks relative to each cash-generating unit. If the estimated discount rate of 13.0% had been 1.0% higher than the estimated rate in the valuation done by outside experts, there would be no need to reduce the book value of goodwill, since the fair value of the groups of cash-generating units to which the goodwill was allocated would be Ps. 8,653,365 and exceeds their book value of Ps. 2,888,669.

OTHER INTANGIBLE ASSETS

OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2017
Intangible assets other than goodwill [abstract]
Disclosure of intangible assets [text block]	NOTE 18 – OTHER INTANGIBLE ASSETS Below is the detail of the balances of other intangible assets as of December 31, 2017 and 2016: December 31, 2017 Description Cost Accumulated Net book Software and information technology applications purchased Ps. 845,402 Ps. (292,959 ) Ps. 552,443 Licenses 391,726 (137,998 ) 253,728 Other intangibles assets 52,125 (9,615 ) 42,510 Total Ps. 1,289,253 Ps. (440,572 ) Ps. 848,681 December 31, 2016 Description Cost Accumulated Net book Software and information technology applications purchased Ps. 649,053 Ps. (208,485 ) Ps. 440,568 Licenses 338,206 (98,296 ) 239,910 Other intangibles assets 66,592 (12,027 ) 54,565 Total Ps. 1,053,851 Ps. (318,808 ) Ps. 735,043

INCOME TAX

INCOME TAX	12 Months Ended
	Dec. 31, 2017
Disclosure of income tax [Abstract]
Disclosure of income tax [text block]	NOTE 19 – INCOME TAX 19.1. Components of the income tax expense: The expense for income tax for the years ended on December 31, 2017, 2016 and 2015 comprise the following: December 31, December 31, December 31, Current period income tax Ps. 1,276,458 Ps. 1,264,066 Ps. 1,190,949 Income tax surcharge 151,980 - - CREE tax - 295,324 356,475 CREE surcharge - 193,425 200,965 Subtotal current period taxes 1,428,438 1,752,815 1,748,389 Prior years adjustments (1) (117,568 ) (13,440 ) (19,282 ) Adjustment due to uncertain tax positions in prior years (7,367 ) (31,067 ) 3,542 Deferred taxes 449,291 348,601 146,321 Total Ps. 1,752,794 Ps. 2,056,909 Ps. 1,878,970 (1) Includes a Ps. 109,632 tax recovery at Banco de Bogotá for the years 2014, 2015 and 2016 19.2 Reconciliation of the Nominal Tax Rate and the Effective tax Rate: The following are the basic parameters in force with respect to income tax: In Colombia Colombian regulation for income tax and related taxes applicable during 2017 include the following: · Taxable income is taxed at a rate of 34% in the year 2017 and 33% in 2018 and subsequent years. And additional income tax surcharge of 6% was created in 2017 and 4% in 2018, for those companies with taxable incomes exceeding Ps. 800. · Gains on the sale or disposal of non-current assets held for more than two years is taxed at 10%. · The taxable income for income tax may not be less than 3.5% of each of our tax-declaring companies’ net equity at the end of the preceding year. When the taxable income is less than that this percentage, the difference, known as “presumptive income”, can be offset by taxable income over the following five years. · Tax loss-carry forwards incurred prior to 2017 may be offset on the same terms applicable for 2016, but they may not be fiscally readjusted. Tax loss carry-forwards incurred since 2017 may be offset against company taxable income over the following twelve years. · As of 2017 the companies’ taxable income will be determined based in the new accounting regulation in force in Colombia since January 1, 2015. However, the new tax regulation also includes special income tax rules for several transactions. · Corporate tax returns are in firm by tax authorities three years after the filing date, however if tax loss carry forward are used to offset the taxable income, this term is six years after the filing date. Colombian regulation for income tax and related taxes applicable until 2016 include the following: · Taxable income was taxed at rate of 25% and income tax CREE is taxed at rate of 9% with an additional of 6% in 2016 and 5% in 2015. · Tax loss carry forward incurred since 2007, fiscally readjusted, may be offset with future taxable income at any time, for both income tax and CREE. · The taxable income of the companies may not be lower than 3% of fiscal equity at the end of the preceding year; and if the taxable income is lower than that base, the difference may be deducted from taxable income within five years of its occurrence, as “excess of presumptive income”. · The taxable income is determined on the basis of accounting rules applicable in Colombia up to December 31, 2014, prior to the partial introduction of the IFRS framework in Colombian regulations. · Corporate tax returns are in firm by tax authorities two years after the filing date, however if tax loss carry forward are used to offset the taxable income, this term is five years after the filing date. In other countries Given that our subsidiary Leasing Bogotá Panamá has an international license it has a tax rate of 0%. The subsidiaries in Guatemala are taxed at a rate of 25%; the subsidiaries in El Salvador, Honduras, Costa Rica, Nicaragua and Mexico are taxed at a rate of 30% and the subsidiaries with a local license in Panamá are taxed at a rate of 25%. Below is the detailed reconciliation between total expenses of the income tax of Grupo Aval calculated at the applicable enacted tax rate and the tax expense recognized in the statement of income for the years ended on December 31, 2017, 2016 and 2015: Years ended on: December 31, December 31, December 31, Profit before income tax Ps. 4,915,227 Ps. 5,573,845 Ps. 5,224,656 Enacted tax rate in Colombia 40 % 40 % 39 % Theoretical income tax expense 1,966,091 2,229,538 2,037,616 Nondeductible expenses 387,933 339,803 298,773 Tax losses considered non recoverable for income tax purpose 96,266 140,904 - Presumptive income considered non recoverable for income tax purpose 7,991 45,385 28,954 Wealth tax 40,762 107,051 118,245 Nontaxable dividends (19,587 ) (15,655 ) (47,883 ) Nontaxable income under equity method in associates (68,026 ) (56,306 ) (91,572 ) Profit (loss) on sales or appraisal of investment (16,584 ) (71,669 ) (7,697 ) Nontaxable interest income and other income (137,312 ) (150,714 ) (61,561 ) Other nontaxable income (155,010 ) (83,742 ) (75,171 ) Revenues taxable at different tax rate (658 ) (14,983 ) (5,602 ) Difference from expenses deductibles at different tax rate (11,822 ) (4,679 ) 6,971 Tax benefits in the acquisition of property and equipment (20,585 ) (66,245 ) (67,574 ) Profits (losses) in Subsidiaries in tax free countries or with different tax rate (200,661 ) (143,109 ) (66,729 ) Effect on the deferred income tax due to changes in tax rates (38,574 ) (96,232 ) (71,962 ) Expenses considered non recoverable for deferred income tax purposes - 1,465 11,598 Prior year adjustments (117,568 ) (13,440 ) (44,581 ) Adjustments due to uncertain tax positions in previous year (7,367 ) (31,067 ) 28,374 Other 47,505 (59,396 ) (111,229 ) Total tax expense of the year Ps. 1,752,794 Ps. 2,056,909 Ps. 1,878,970 Effective income tax rate 35.66 % 36.90 % 35.96 % 19.3 Tax Losses and excess of Presumptive Income: As of December 31, 2017 and 2016, following table shows the detail of the tax loss carry forward and excess of presumptive income over taxable income of the entities of Grupo Aval which are not recognized as deferred tax assets. December December Tax loss carry forwards expiring on: December 31, 2019 4,732 - December 31, 2020 1,758 - December 31, 2029 3,107 - December 31, 2030 160,084 - Without expiration date 484,376 397,869 Subtotal 654,057 397,869 Excess of presumptive income expiring on: December 31, 2017 - 5,041 December 31, 2018 43,668 43,307 December 31, 2019 64,590 83,871 December 31, 2020 48,170 54,150 December 31, 2021 64,998 49,600 December 31, 2022 46,727 - Subtotal 268,153 235,969 Total Ps. 922,210 Ps. 633,838 19.4 Deferred Taxes of Subsidiaries Companies: Grupo Aval did not record deferred income tax liabilities related to temporary differences on investments in subsidiaries, corresponding to earnings from such affiliates of Ps. 6,613,585 and Ps. 6,109,113, as of December 31, 2017 and 2016, respectively. The foregoing due to the fact that: i) Grupo Aval has control over the subsidiaries and consequently it controls the reversion of such temporary differences; and ii) Grupo Aval does not foresee its realization in the near term. 19.5 Deferred taxes by Type of Temporary Difference: The differences between the carrying value of the assets and liabilities and their tax bases give rise to the following temporary differences which result in deferred taxes, calculated and recorded in the years ended on December 31, 2017, 2016 and 2015, based on current tax regulations as references for the years wherein such temporary differences will be reverted: Year ended on December 31, 2017 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 62,627 Ps. (30,580 ) Ps. (23,966 ) Ps. - Ps. 8,081 Equity securities at fair value 1,583 (1,254 ) (321 ) - 8 Derivative instruments 78,740 (41,935 ) - - 36,805 Accounts receivable 16,278 (15,589 ) - 10 699 Differences between the accounting and tax bases of loans and receivables 6,014 65,924 - - 71,938 Allowance for impairment on loans and receivables 105,573 (39,446 ) - - 66,127 Allowance for other accounts receivable 6,219 (1,570 ) - - 4,649 Financial assets in concession contracts 25,837 2,571 - 128 28,536 Differences between accounting and tax basis of foreclosed assets 4,846 13,315 - - 18,161 Differences between accounting and tax basis of the cost in property, plant and equipment 296,269 68,271 - - 364,540 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 5,699 6,294 - - 11,993 Biological assets 101 68 - - 169 Differences between accounting and tax basis of deferred charges and of intangible assets 113,817 30,922 - 886 145,625 Tax losses carry forward 385,855 (53,556 ) - 55 332,354 Surplus of presumptive income 19,480 (16,952 ) - - 2,528 Provisions 212,695 (17,649 ) - 2,917 197,963 Employee benefits 104,606 (29,658 ) 23,976 - 98,924 Deferred income 113,380 (113,380 ) - - - Lease agreements 9.160 (1,118 ) - - 8,042 Other 69,022 52,233 935 1,455 123,645 Subtotal Ps. 1,637,801 Ps. (123,089 ) Ps. 624 Ps. 5,451 Ps. 1,520,787 Defered tax liabilities Debt securities at fair value Ps. (27,278 ) Ps. 29,105 Ps. (46,319 ) Ps. - Ps. (44,492 ) Equity securities at fair value (122,513 ) 302 33 952 (121,226 ) Derivative instruments (67,974 ) (15,190 ) (4,361 ) - (87,525 ) Accounts receivable (260,621 ) (46,335 ) - - (306,956 ) Differences between the accounting and tax bases of loans and receivables (268,747 ) (53,999 ) - - (322,746 ) Allowance for impairment on loans and receivables (275,785 ) (122,053 ) - - (397,838 ) Differences between accounting and tax basis of foreclosed assets (46,783 ) (25,426 ) - - (72,209 ) Provision for foreclosed assets (37,798 ) (3,856 ) - - (41,654 ) Differences between the accounting and tax base for property plant and equipment costs (400,180 ) 36,404 - (38 ) (363,814 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (209,549 ) 30,948 - (1,276 ) (179,877 ) Differences between accounting and tax basis of deferred charges and of intangible assets (60,598 ) (47,123 ) - - (107,721 ) Provisions (471 ) (62 ) 116 (158 ) (575 ) Goodwill (86,036 ) (83,639 ) - - (169,675 ) Deferred Income (34,613 ) (5,921 ) - - (40,534 ) Financial assets in concession arrangements (718,496 ) 20,548 - (2,790 ) (700,738 ) Biological assets (6,806 ) (9,777 ) - - (16,583 ) Other (65,400 ) (30,128 ) (11,053 ) 2,537 (104,044 ) Subtotal Ps. (2,689,648 ) Ps. (326,202 ) Ps. (61,584 ) Ps. (773 ) Ps. (3,078,207 ) Net Ps. (1,051,847 ) Ps. (449,291 ) Ps. (60,960 ) Ps. 4,678 Ps. (1,557,420 ) Year ended on December 31, 2016 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 290,465 Ps. (5,459 ) Ps. (212,090 ) Ps. (10,289 ) Ps. 62,627 Equity securities at fair value 323 (26,416 ) 27,676 - 1,583 Derivative instruments 518,992 (223,831 ) (165,894 ) (50,527 ) 78,740 Accounts receivable 7,852 8,426 - - 16,278 Differences between the accounting and tax bases of loans and receivables 5,652 362 - - 6,014 Allowance for impairment on loans and receivables 96,054 9,679 - (160 ) 105,573 Allowance for other accounts receivable 18,119 (11,900 ) - - 6,219 Financial assets in concession contracts 12,096 13,741 - - 25,837 Differences between accounting and tax basis of foreclosed assets 13,326 (8,480 ) - - 4,846 Differences between accounting and tax basis of the cost in property, plant and equipment 58,505 237,739 - 25 296,269 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 5,415 284 - - 5,699 Biological assets 369 (268 ) - - 101 Differences between accounting and tax basis of deferred charges and of intangible assets 77,055 37,167 - (405 ) 113,817 Tax losses carry forward 527,153 (140,623 ) - (675 ) 385,855 Surplus of presumptive income 166,116 (146,636 ) - - 19,480 Provisions 146,578 60,716 5,706 (305 ) 212,695 Employee benefits 101,224 (5,718 ) 8,677 423 104,606 Goodwill 6,947 (6,947 ) - - - Deferred income 35,857 77,523 - - 113,380 Lease agreements 8,414 746 - - 9.160 Other 174,966 (107,102 ) - 1,158 69,022 Subtotal Ps. 2,271,478 Ps. (236,997 ) Ps. (335,925 ) Ps. (60,755 ) Ps. 1,637,801 Deffered tax liabilities Debt securities at fair value (19,943 ) 44,338 (51,673 ) - (27,278 ) Equity securities at fair value (104,317 ) (9,072 ) 13,059 (154 ) (100,484 ) Derivative instruments (333,317 ) 240,468 (21,586 ) 46,461 (67,974 ) Accounts receivable - (260,621 ) - - (260,621 ) Differences between the accounting and tax bases of loans and receivables (238,492 ) (30,255 ) - - (268,747 ) Allowance for impairment on loans and receivables (227,336 ) (48,449 ) - - (275,785 ) Differences between accounting and tax basis of foreclosed assets (83,774 ) 36,991 - - (46,783 ) Provision for foreclosed assets (15,198 ) (22,600 ) - - (37,798 ) Differences between the accounting and tax base for property plant and equipment costs (355,478 ) (44,865 ) - 163 (400,180 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (227,591 ) 18,114 - (72 ) (209,549 ) Differences between accounting and tax basis of deferred charges and of intangible assets (60,003 ) (595 ) - - (60,598 ) Unrealized profits of foreign subsidiaries (38,209 ) 16,180 - - (22,029 ) Provisions (1,961 ) 1,490 - - (471 ) Goodwill (42,822 ) (43,214 ) - - (86,036 ) Deferred Income (26,940 ) (7,673 ) - - (34,613 ) Financial assets in concession arrangements (627,666 ) (90,830 ) - - (718,496 ) Biological assets (17,578 ) 3,320 - 7,452 (6,806 ) Other (152,824 ) 85,669 - 1,755 (65,400 ) Subtotal Ps. (2,573,449 ) Ps. (111,604 ) Ps. (60,200 ) Ps. 55,605 Ps. (2,689,648 ) Net Ps. (301,971 ) Ps. (348,601 ) Ps. (396,125 ) Ps. (5,150 ) Ps. (1,051,847 ) Year ended on December 31, 2015 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 17,317 Ps. 240,415 Ps. 263,532 Ps. (230,799 ) Ps. 290,465 Equity securities at fair value 7,505 (1,082 ) - (6,100 ) 323 Derivatives instruments 555,521 (159,875 ) (19,044 ) 142,390 518,992 Differences between the accounting and tax bases of the loans and receivables 30,998 (26,337 ) - 991 5,652 Account receivable - 7,852 - - 7,852 Allowance for impairment on loans and receivables 102,662 12,503 - (19,111 ) 96,054 Allowance for other accounts receivable 1,897 (1,730 ) - 17,952 18,119 Financial asset in concession contracts 11,341 588 - 167 12,096 Differences between accounting and tax basis of goods received as payment 30,180 (16,854 ) - - 13,326 Differences between accounting and tax basis of the cost in property, plant and equipment 39,561 21,074 - (2,130 ) 58,505 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 6,938 (1,526 ) - 3 5,415 Biological assets 4,580 (4,211 ) - - 369 Differences between accounting and tax basis of deferred charges of intangible assets 59,354 17,701 - - 77,055 Tax losses carry forward 45,601 3,020 478,532 - 527,153 Surplus of presumptive income 16,147 (13,249 ) 163,218 - 166,116 Provisions 126,762 23,070 - (3,254 ) 146,578 Employee benefits 104,872 3,927 (7,251 ) (324 ) 101,224 Goodwill 6,947 - - - 6,947 Deferred Income 8,092 30,574 - (2,809 ) 35,857 Lease agreements 7,315 1,099 - - 8,414 Other 180,108 (68,038 ) - 62,896 174,966 Subtotal Ps. 1,363,698 Ps. 68,921 Ps. 878,987 Ps. (40,128 ) Ps. 2,271,478 Deffered tax liabilities Debt securities at fair value 9,509 (243,790 ) - 214,338 (19,943 ) Equity securities at fair value (103,469 ) 103 - (951 ) (104,317 ) Derivatives instruments (346,677 ) 149,307 - (135,947 ) (333,317 ) Differences between the accounting and tax bases of the loans and receivables (77,205 ) (27,030 ) - (134,257 ) (238,492 ) Allowance for impairment on loans and receivables (366,953 ) 5,457 - 134,160 (227,336 ) Differences between the accounting and tax base of goods received as payment (60,587 ) (44,414 ) - 21,227 (83,774 ) Provision for goods received as payment (10,070 ) (5,151 ) - 23 (15,198 ) Differences between the accounting and tax base for property plant and equipment costs (453,088 ) 98,866 - (1,256 ) (355,478 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (207,123 ) (23,775 ) - 3,307 (227,591 ) Differences between accounting and tax basis of deferred charges of intangible assets (33,639 ) (26,364 ) - - (60,003 ) Profits not carried as investments in subsidiaries (17,974 ) (20,235 ) - - (38,209 ) Provisions (24,468 ) 18,448 - 4,059 (1,961 ) Goodwill (23,166 ) (19,656 ) - - (42,822 ) Accumulative translation adjustment in foreign operations (22,661 ) (7,088 ) - 2,809 (26,940 ) Financial and intangible assets in concession contracts (484,105 ) (143,561 ) - - (627,666 ) Biological assets (10,098 ) (7,480 ) - - (17,578 ) Other (137,604 ) 81,121 - (96,340 ) (152,823 ) Subtotal Ps. (2,369,378 ) Ps. (215,242 ) Ps. - Ps. 11,171 Ps. (2,573,449 ) Net Ps. (1,005,680 ) Ps. (146,321 ) Ps. 878,987 Ps. (28,957 ) Ps. (301,971 ) The Group offsets deferred tax assets and liabilities by entity and tax authority, considering the application of the tax provisions in Colombia and other countries in which the legal right to offset tax assets and liabilities and other requirements in IAS 12, according to the following breakdown: December 31, 2017 Gross Deferred tax Offset Balances on Statement Deferred tax asset Ps. 1,520,787 Ps. (1,381,364 ) Ps. 139,423 Deferred tax liability (3,078,207 ) 1,381,364 (1,696,843 ) Net Ps. (1,557,420 ) Ps. - Ps. (1,557,420 ) December 31, 2016 Gross Deferred tax Offset Balances on Statement Deferred tax asset Ps. 1,637,801 Ps. (1,442,839 ) Ps. 194,962 Deferred tax liability (2,689,648 ) 1,442,839 (1,246,809 ) Net Ps. (1,051,847 ) Ps. - Ps. (1,051,847 ) 19.6 Effect of the current and deferred taxes in each component of other comprehensive income in equity: The effects of the current and deferred taxes in each component of other comprehensive income is detailed below during the years ended on December 31, 2017, 2016 and 2015: December 31, 2017 Amount Current Deferred Net Hedging of net investments in foreign subsidiaries operations Ps. (47,197 ) Ps. - Ps. - Ps. (47,197 ) Hedging derivatives in foreign currency 16,832 - (5,554 ) 11,278 Hedging financial liabilities in foreign currency 30,568 - (11,065 ) 19,503 Cash Flow hedging (2,340 ) - 969 (1,371 ) Foreign currency translation differences for foreign operations (91,497 ) (12,657 ) 956 (103,198 ) Debt financial instruments 284,480 - (69,743 ) 214,737 Equity financial instruments 57,245 - (720 ) 56,525 Investment in associates and joint ventures 1,128 - 116 1,244 Actuarial gains (losses) from defined benefit pension plans (100,232 ) - 24,081 (76,151 ) Total “other comprehensive income” during the period Ps. 148,987 Ps. (12,657 ) Ps. (60,960 ) Ps. 75,370 December 31, 2016 Amount Current Deferred Net Hedging of net investments in foreign subsidiaries operations Ps. (475,000 ) Ps. - Ps. - Ps. (475,000 ) Hedging derivatives in foreign currency 291,506 47,419 (187,480 ) 151,445 Hedging financial liabilities in foreign currency 35,819 (23,854 ) - 11,965 Cash Flow hedging 17,967 - - 17,967 Foreign currency translation differences for foreign operations (125,161 ) 8,204 - (116,957 ) Debt financial instruments 948,212 - (263,763 ) 684,449 Equity financial instruments 34,509 - 40,735 75,244 Investment in associates and joint ventures (20,061 ) - - (20,061 ) Actuarial gains (losses) from defined benefit pension plans (41,228 ) - 14,383 (26,845 ) Total “other comprehensive income” during the period Ps. 666,563 Ps. 31,769 Ps. (396,125 ) Ps. 302,207 December 31, 2015 Amount Current Deferred tax Net Hedging of net investments in foreign subsidiaries operations Ps. 2,366,849 Ps. (37,861 ) Ps. - Ps. 2,328,988 Hedging derivatives in foreign currency (1,683,346 ) 89,960 629,531 (963,855 ) Hedging financial liabilities in foreign currency (755,431 ) 267,528 - (487,903 ) Cash Flow hedging 17,500 - (6,825 ) 10,675 Foreign currency translation differences for foreign operations 24,878 - - 24,878 Debt financial instruments (922,083 ) - 263,532 (658,551 ) Equity financial instruments (6,548 ) - - (6,548 ) Investment in associates and joint ventures 31,964 - - 31,964 Actuarial gains (losses) from defined benefit pension plans 6,162 - (7,251 ) (1,089 ) Total “other comprehensive income” during the period Ps. (920,055 ) Ps. 319,627 Ps. 878,987 Ps. 278,559 19.7 Uncertainties in Open Tax Positions As of December 31, 2017 and 2016, Grupo Aval recognized tax uncertainty liabilities for Ps. 94,692 and Ps. 104,156 respectively, uncertain tax positions corresponding to expenses of employees’ benefits, considered deductible, and which, according to decisions of the tax authorities, uncertainties taken for human resources and public relations could be considered as non-deductible. Grupo Aval estimates those exposures are likely to be required and rejected by the tax authorities. These tax positions cannot be deducted with future taxes. Uncertainties on open tax positions of the four banks of Grupo Aval are as follows: Bank December 31, 2017 December 31, 2016 Bogotá Ps. 86,592 Ps. 66,428 Occidente 7,657 31,463 Popular 443 338 Villas - 5,927 Total Ps. 94,692 Ps. 104,156 Penalties and interests are accumulated and recognized as operating expenses. The roll-forward of tax uncertainties during the years ended on December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 104,156 Ps. 145,968 Ps. 114,627 Provisions increase during the year 18,039 31,039 30,191 Provisions used (873 ) (1,867 ) (1,145 ) Amounts reversed due to provisions not used (32,010 ) (73,084 ) (25,259 ) Financial cost 7,477 12,098 7,541 Foreign exchange adjustments (2,097 ) (9,998 ) 20,013 Balance at the end of the year Ps. 94,692 Ps. 104,156 Ps. 145,968 The balance as of December 31, 2017 and 2016 is expected to be completely used or released once the inspection rights from the tax authorities regarding tax returns expire, as follows: Year December 31, December 31, 2017 - 10,027 2018 3,484 11,057 2019 3,109 13,670 2020 21,579 23,926 2021 23,902 24,413 2022 23,034 19,681 2023 18,250 1,382 2024 1,334 - Total Ps. 94,692 Ps. 104,156

CUSTOMER DEPOSITS

CUSTOMER DEPOSITS	12 Months Ended
	Dec. 31, 2017
Disclosure of Customer Deposits [Abstract]
Disclosure of deposits from customers [text block]	NOTE 20 – CUSTOMER DEPOSITS Following is a detail of the balances of the deposits received from Grupo Aval´s customer: Detail December 31, 2017 December 31, 2016 Demand Checking accounts Ps. 36,017,602 Ps. 34,978,189 Savings accounts 55,778,677 50,573,924 Other funds on demand 472,782 328,798 92,269,061 85,880,911 Term deposits Fixed term deposit certificates 62,616,163 58,006,144 Total Deposits 154,885,224 143,887,055 Per currency In Colombian Pesos 96,797,225 90,834,599 In foreign currency 58,083,025 53,014,364 Other 4,974 39,092 Total per currency Ps. 154,885,224 Ps. 143,887,055 The detail of the maturities of term deposits in force as of December 31, 2017 is as follows: Year 2017 2018 Ps. 44,746,591 2019 8,672,896 2020 2,872,870 2021 1,418,289 After 2021 4,905,517 Total Ps. 62,616,163 A summary of the effective interest rates which are accrued on customer deposits is as follows: December 31, 2017 Deposits In foreign currency Minimum Maximum Minimum Maximum % % % % Checking accounts 0.06 % 5.77 % 0.15 % 1.50 % Saving accounts 0.01 % 8.55 % 0.05 % 8.00 % Fixed term deposit certificates 0.05 % 9.72 % 0.01 % 10.43 % December 31, 2016 Deposits In foreign currency Minimum Maximum Minimum Maximum % % % % Checking accounts 0.53 % 8.54 % 0.10 % 4.08 % Saving accounts 0.01 % 8.75 % 0.05 % 4.08 % Fixed term deposit certificates 0.05 % 12.64 % 0.05 % 13.04 % Following is the detail of the concentration of deposits received from customers per economic sector: December 31, 2017 December 31, 2016 Amount % Amount % Commerce 29,587,825 19 % 20,717,015 14 % Financial 25,302,624 16 % 19,591,523 14 % Individuals 23,362,871 15 % 36,983,897 26 % Government and Colombian Government Entities 17,443,318 11 % 14,879,219 10 % Manufacturing 9,016,500 6 % 7,902,332 5 % Real Estate 6,197,620 4 % 7,078,922 5 % Agriculture and livestock 2,401,684 2 % 3,241,177 2 % Colombian Municipalities 2,290,683 1 % 3,289,615 2 % Foreign Governments 799,687 1 % 1,048,947 1 % Other(1) 38,482,412 25 % 29,154,408 21 % Total 154,885,224 100 % 143,887,055 100 % (1) December 31, 2017, includes deposits from, education entities of Ps. 1,189,343, services sector of Ps. 10,201,383, science and technology Ps. 1,884,123, hydrocarbons Ps. 3,113,098, transport Ps. 1,990,271 and others in the sector Ps. 20,104,194.

FINANCIAL OBLIGATIONS

FINANCIAL OBLIGATIONS	12 Months Ended
	Dec. 31, 2017
Disclosure of Deposits From Financial Obligations [Abstract]
Disclosure of financial liabilities [text block]	NOTE 21 – FINANCIAL OBLIGATIONS 21.1. Financial obligations other than issued bonds a) Interbank borrowings, overnight funds and borrowings from banks and others Following is a summary of the financial obligations of Grupo Aval as at December 31, 2017 and 2016: December December Local Currency Interbank funds Overnight funds Ps. 1,464 Ps. 2,075 Interbank funds purchased 336,431 1,366,757 Commitments to transfer open and closed repo operations 715,364 1,259,676 Commitments to transfer simultaneous operations 2,272,496 2,436,838 Commitments originated in short positions simultaneous operations 176,048 538,016 Total interbank funds Ps. 3,501,803 Ps. 5,603,362 Borrowings 2,831,100 2,084,988 Letters of credit 485 3,509 Bankers´ acceptances 17 517 Total borrowings from banks and others Ps. 2,831,602 Ps. 2,089,014 Foreign currency Interbank funds Overnight funds 217 3,498 Interbank funds purchased 1,135,110 309,924 Commitments to transfer open and closed repo operations 333,300 398,933 Total interbank funds Ps. 1,468,627 Ps. 712,355 Borrowings 14,529,524 15,086,112 Letters of credit 195,988 6,976 Bankers´ acceptances 648,206 724,531 Total borrowings from banks and others Ps. 15,373,718 Ps. 15,817,619 Total financial obligations Ps. 23,175,750 Ps. 24,222,350 As of December 31, 2017, short-term obligations associated with simultaneous and repo operations for an amount of Ps. 2,272,496, guaranteed with investments for an amount of Ps.3,400,677 and as of December 31, 2016 Ps. 2,436,838 were guaranteed with investments for an amount of Ps. 5,264,105. b) Borrowings from development entities The Colombian Government has established certain credit programs for promoting the development of specific sectors of the economy, including foreign trade, agriculture, tourism, housing construction and other industries. The programs are managed by many entities of the Government such as Banco de Comercio Exterior (“BANCOLDEX”), Fondo para el Financimiento del Sector Agropecuario (“FINAGRO”) and Financiera del Desarrollo Territorial (“FINDETER”). The details of the borrowings from these entities as of December 31, 2017 and 2016 and are as follows: Interest rates in force at cut off December 31, December 31, Banco de Comercio Exterior - “BANCOLDEX” Fixed between 0.07% and %13.20%, DTF + 0.01 to 14.43%, IBR + 0.01 to 14.43, LIBOR6 + 0.01 to 4.46, LIBOR12 +0.01 Ps. 835,667 Ps. 736,721 Fondo para el Financiamiento del Sector Agropecuario - “FINAGRO” Fixed between 5.22% and 6.30%, DTF + 0.01 to 7.74%, IBR and IPC + 2.0 and 7.74%, 342,728 337,649 Financiera de Desarrollo Territorial “FINDETER” Fixed 0.03% and 9.77%, DTF + 0.01 to 8.48, IBR+ 0.30 to 8.48, IPC+ 0.01 and 0.05%, LIBOR3 0.04 and LIBOR6 +0.04% 1,819,695 1,651,325 Total Ps. 2,998,090 Ps. 2,725,695 Details showing the maturities of the financial obligations with development entities as for December 31, 2017 are as follows: Year 2017 2018 Ps. 207,509 2019 197,193 2020 400,848 2021 353,270 After 2021 1,839,270 Total Ps. 2,998,090 21.2. Financial obligations from issued bonds The different entities from Grupo Aval are authorized by the Superintendency of Finance and by the regulatory entities abroad where Grupo Aval operates, for issuing or placing either bonds or general guarantee bonds. The bonds issued by Grupo Aval and its banking subordinates are non-guaranteed. a) The detail of liabilities as of December 31, 2017 and 2016, by issue date and maturity date was as follows: Peso denominated Issuer Issue Date December December Maturity Date Interest Rate Banco de Bogotá S.A. 23/02/2010 132,989 248,234 23/02/2020 CPI + 5.45% Banco de Occidente Between 25/08/2008 and 14/12/2017 3,271,929 2,811,593 Between 16/07/2018 and 14/12/2032 CPI + 2.90% to7.00% Corporación Financiera Colombiana S.A. Between 20/05/2009 and 08/09/2016 2,361,702 2,356,272 Between 11/03/2019 and 08/09/2036 CPI + 4.00% to 6.9% Banco Popular Between 26/02/2013 and 12/09/2017 1,571,308 1,620,504 Between 17/02/2018 and 12/10//2026 CPI + 2.44% to 4.13% Grupo Aval 03/12/2009 and 28/06/2017 Ps. 1,109,240 Ps. 704,726 Between 03/12/2019 and 28/06/2042 CPI + 2.69% to 5.20% Peso denominated Total Ps. 8,447,168 Ps. 7,741,329 Foreign Currency Banco de Bogotá S.A. Between 19/02/2013 and 03/08 /2017 6,459,452 6,656,720 Between 19/02/2023 and 03/08/2027 Fixed between 4.38% and 6.25% BAC Credomatic El Salvador Between 11/02/2013 and 28/11/2017 635,536 552,861 Between 27/01/2018 and 25/05/2022 Between 5.20% and 5.80% Guatemala Between 15/02/2016 and 20/12/2017 400,244 543,441 Between 04/01/2018 and 25/02/2019 Between 4.50% and 8.50% Honduras Between 23/07/2013 and 06/12/2017 159,674 68,929 Between 26/03/2018 and 06/12/2020 Between 0.50% and 9.50% Nicaragua - - 12,040 - - BAC Credomatic Total Ps. 1,195,454 Ps. 1,177,271 Banco Bogotá Total Ps. 7,654,906 Ps. 7,833,991 Grupo Aval Limited 19/09/2012 3,000,122 2,992,916 26/09/2022 4.75% Foreign Currency Total Ps. 10,655,028 Ps. 10,826,907 Total of Bonds Ps. 19,102,196 Ps. 18,568,236 Future maturities of bonds as of December 31, 2017 are as follows: Year 2017 2018 Ps. 983,915 2019 1,332,505 2020 1,973,046 2021 452,159 After 2021 14,360,571 Total Ps. 19,102,196 Grupo Aval has not had any defaults of principal or interest or other breaches with respect to its liabilities during the years ended 31 December 2017 and 2016, and Grupo Aval is complying with the related covenants agreed with investors and debtors.

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	12 Months Ended
	Dec. 31, 2017
Disclosure of Defined Benefit Plan Explanatory [Abstract]
Disclosure of defined benefit plans [text block]	NOTE 22 – EMPLOYEE BENEFITS In accordance with Colombian and other countries labor legislation where Grupo Aval has subsidiaries, and pursuant to labor conventions and labor collective agreements entered into with employees, employees of Grupo Aval have short term benefits such as: salaries, holidays, legal and extralegal premiums, severances and interests on severances, long-term benefits such as seniority bonds premiums and medical aids, post-employment benefits and retirement benefits such as: severance payments to employees that continue with labor regime before Law 50 of 1990 and legal and extralegal retirement pensions. Compensation for key personnel of the management includes salaries, benefits different than cash and contributions. (See note 35). Through personnel benefits plans, Grupo Aval is exposed to several risks (interest rates and operating), which are intended to be minimized by applying the risk management policies and procedures defined in Note 4 above. The detail of the balance of liabilities for employee benefits at December 31, 2017, and 2016 is as follows: December 31, 2017 December 31, 2016 Short term Ps. 404,292 Ps. 397,460 Post-employment 604,110 509,022 Long term 229,770 191,112 Total Ps. 1,238,172 Ps. 1,097,594 22.1 Post-employment benefits · In Colombia, when employees retire after completing certain years and time of service, retirement pensions are assumed by public or private pension funds based on defined contribution plans, to which entities and employees contribute monthly defined amounts by law for being entitled to the pension at the time of retirement. However, for some employees hired by Grupo Aval entities prior to 1968 that have fulfilled the requirements of age and years of service the pensions are directly assumed by some of the entities of Grupo Aval. · Certain employees hired by entities of Grupo Aval before 1990 are entitled to receive a compensation corresponding to the last month of salary multiplied by each year of service. · Some subsidiaries have labor conventions or pay extra-legal premiums to employees retiring in compliance with the required age and time of service, when they start enjoying the pension granted by the pension funds. 22.2 Long Term Employee Benefits Some Grupo Aval subsidiaries grants their employees extra-legal long term premiums during the working life depending on number of years of service, five, ten, fifteen, or twenty years etc., calculated as days of salary per year of work. Some pensioners receive benefits that include covergage of medical treatments, hospitalization and surgery. Grupo Aval has recognized the liabilities corresponding to these benefits, based on the same actuarial calculations carried out under the same parameters of retirement benefits. Post-employment and long-term benefits movements during the years ended at December 31, 2017, 2016 and 2015 are as follows: Post-Employment benefits Long-term Benefits December December December December December December Balance at the beginning of the year Ps. 509,022 Ps. 436,696 Ps. 442,258 Ps. 191,112 Ps. 206,971 Ps. 188,522 Service costs 4,425 3,006 2,158 18,201 19,243 16,745 Interests cost 51,027 69,348 31,338 8,928 (20,274 ) 11,975 Gain on settlements 252 - - (112 ) - - Past Service Costs - - 2,712 - - 2,711 564,726 509,050 478,466 218,129 205,940 219,953 Changes in actuarial assumptions from changes in demographic assumptions. (8,863 ) (1,232 ) 7,171 (1,432 ) (6,456 ) (2,162 ) Changes in actuarial assumptions from changes in financial assumptions. 109,095 42,460 (1,009 ) 43,870 18,845 7,515 100,232 41,228 6,162 42,438 12,389 5,353 Exchange differences (982 ) 6,083 (27 ) - - 8,236 Payments to employees (59,866 ) (47,337 ) (47,905 ) (30,797 ) (27,217 ) (26,571 ) Balance at the end of the year Ps. 604,110 Ps. 509,022 Ps. 436,696 Ps. 229,770 Ps. 191,112 Ps. 206,971 The assumptions used to calculate the obligation projected for different post-employment benefits employees are as follows: Post-Employment Benefits December 31, December 31, Discount interest rate 6.59% 7.23% Inflation rate 3.50% 3.50% Salary growth rate 3.50% 3.50% Pension growth rate 3.50% 3.50% Employee turnover rate (between service year 1 and 40 for men and women the following is the turnover rate) Tabla de Rotación SoA 2003 (1) Tabla de Rotación SoA 2003 (1) Long-Term Benefits December 31, December 31, Discount interest rate 6.33% 7.23% Inflation rate 3.50% 3.50% Salary growth rate 3.50% 3.50% Pension growth rate N/A N/A Employee turnover rate (between service year 1 and 40 for men and women the following is the turnover rate) Tabla de Rotación SoA 2003 (1) Tabla de Rotación SoA 2003 (1) (1) For those entities where a sufficiently strong statistic is not yet available to support the actuarial bases, the SoA2003 table is used as a reference. With this table, the probability of permanence of personnel in the entity is established, modified according to the population factor of each benefit. Employee´s life expectation is calculated based on the mortality tables published by the Superintendency of Finance, which are based on mortality experiences provided to the Superintendency of Finance by several insurance companies operating in Colombia. The sensitivity analysis for post-employment and long-term benefits liabilities due to defined benefits plans to different actuarial and financial variables is shown below, maintaining other variables at constant values (increase or decrease 0.5%): At December 31, 2017 Post-Employment Benefits Long-Term Benefits Discount interest Ps. 910 Ps. 482 Salaries growth rate 492 581 Retirement growth rate 855 N/A Future benefit payments projected, reflecting services, as the case may be, are expected to be paid as follows: Year Payments for Post- Payments for Long- 2018 66,310 34,520 2019 59,130 35,659 2020 58,545 34,883 2021 59,199 30,143 2022 58,250 29,821 Years 2023–2027 270,420 141,937 As of December 31, 2017, the participants of the Post-Employment benefits are 42,646 employees and the Long-Term participants are 31,987 employees.

PROVISIONS FOR LEGAL AND OTHERS

PROVISIONS FOR LEGAL AND OTHERS	12 Months Ended
	Dec. 31, 2017
Disclosure of provisions for legal and others [Abstract]
Disclosure of provisions [text block]	NOTE 23 – PROVISONS FOR LEGAL AND OTHERS Roll-forward of legal provisions during the years ended on December 31, 2017 and 2016 are as follows: For Legal Other Provisions Total Provisions Balance as of December 31, 2014 Ps. 185,656 Ps. 558,997 Ps. 744,653 Provisions increase during the year 13,406 72,032 85,438 Use of provisions (27,816 ) (60,085 ) (87,901 ) Amounts reversed due to provisions not utilized (22,932 ) (21,033 ) (43,965 ) Financial cost - (1,284 ) (1,284 ) Variations in exchange in foreing currency - 195 195 Reclassification - (96,909 ) (96,909 ) Balance as of December 31, 2015 Ps. 148,314 Ps. 451,913 Ps. 600,227 Provisions increase during the year 32,405 363,211 395,616 Use of provisions (13,143 ) (319,592 ) (332,735 ) Amounts reversed due to provisions not utilized (12,938 ) (30,249 ) (43,187 ) Reclassifications 1,111 (676 ) 435 Balance as of December 31, 2016 Ps. 155,749 Ps. 464,607 Ps. 620,356 Provisions increase during the year 32,670 222,349 255,019 Use of provisions (15,012 ) (117,643 ) (132,655 ) Amounts reversed due to provisions not utilized (7,870 ) (42,459 ) (50,329 ) Reclassifications (184 ) 408 224 Balance as of December 31, 2017 Ps. 165,353 Ps. 527,262 Ps. 692,615 Provisions for legal: Administrative proceedings At December 31, 2017 and 2016 provisions were recorded for administrative proceedings for Ps. 68,526 and Ps. 65,042 respectively, for litigation, mainly due to the alleged breach of contract for building the Gibraltar-Bucaramanga pipeline -amounting to Ps. 50,107 and Ps. 43,592 respectively. This process is currently in the State Council, subject to an appeal which was filed for annulment of the Arbitral Award rendered by the Arbitration Tribunal. Labor proceedings At December 31, 2017 and 2016 provisions were recorded by labor proceedings for Ps. 46,785 and Ps. 46,475 respectively. Labor proceedings include labor pursuits, indemnities for ex-employees against of several subsidiaries of Grupo Aval and pensions claims (survivor pensions, invalidity pensions, seniority pensions, return of balances, etc.) in Porvenir, the time expected for resolution is uncertain due to the fact that each proceeding is based on different instances, however, most cases are resolved in favor of Grupo Aval. Other proceedings At December 31, 2017 and 2016 other legal were recorded proceedings for Ps. 50,042 and Ps. 44,233, respectively, the most representative being the litigation against Compañía Hotelera Cartagena de Indias for Ps. 24,815 and Ps. 23,289, as of December 31, 2017 and 2016, respectively, that claims to declare the violation of collective rights and interests of administrative morality, the enjoyment of public space, the enjoyment of a healthy environment and the existence of ecological balance and management and rational use of natural resources property of the State, and that, as a consequence of this violation, will be ordered to the State the restitution of 37,018 square meters, result of the accretions on the sea and of the illegal contribution of five lots delivered by the Municipality of Cartagena. In addition, a provision was made in Porvenir to cover claims for estimating payments to the Unidad de Gestión Pensional y Parafiscal for outstanding contributions of the AFP Horizonte to its employees in 2012 and 2013 for Ps. 20,449 and Ps. 15,550, respectively. Other provisions: At December 31, 2017 and 2016 other provisions recorded amounting Ps. 527,262 and Ps. 464,607, respectlively, are mainly comprised by a provision of Corficolombiana affiliates for Ps. 229,447 and Ps. 204,670, respectively, associated with the maintenance, restoration and rehabilitation of constructions and buildings, dismantling of assets, professional fees relating to development of concession contracts. Additionally, this caption includes a provision of Porvenir subsidiary for individual savings accounts shortfalls of people, which their retirement pensions are covered by the mandatory fund denominated “Fondo de Pensiones Obligatorias Especial Porvenir del Retiro Programado” managed by Porvenir, pursuant to legal provisions in force requiring they should be assumed by the pensions fund manager. This provision is calculated in accordance with projections performed based on actuarial assumptions that show some people with limited resources in the Fund will not cover their future pension payments. The provisions for this matter at December 31, 2017 and 2016 amounted Ps. 175,000 and Ps. 173,541, respectively. Other provisions also includes provisions of several subsidiaries of Grupo Aval for Ps. 50,541 and Ps. 38,292 for the periods ended on December 31, 2017 and 2016, respectively, corresponding to the dismantling of ATMs and offices; and for Ps. 23,462 and Ps. 25,154, respectively, for provisions of losses on loan commitments.

OTHER LIABILITIES

OTHER LIABILITIES	12 Months Ended
	Dec. 31, 2017
Disclosure of accounts Payable and other liabilities [Abstract]
Disclosure of other liabilities [text block]	NOTE 24 –OTHER LIABILITIES Accounts payable and other liabilities comprise the following: Items December 31, 2017 December 31, 2016 Suppliers and services payable Ps. 1,818,103 Ps. 1,609,361 Cashier checks 697,575 802,270 Dividends payable 590,040 644,733 Non-financial liabilities 500,209 580,842 Withholdings taxes and labor contributions 456,411 496,437 Commissions and fees 399,155 197,322 Collection service 285,017 235,325 Collection on behalf of third parties 272,206 256,035 Affiliate establishments 248,064 194,221 Canceled accounts 81,841 28,649 Tax levies 73,696 72,790 Checks drawn and not paid 39,624 41,093 Financial transactions tax 37,042 42,110 Insurance payables 32,410 29,962 Promissory buyers 24,049 27,819 Contributions and affiliations 23,173 28,380 Leases 10,912 8,054 Cash Surplus 9,272 8,081 Deferred credits 1,012 1,051 Compensation to customers 778 1,151 Other liabilities 634,877 651,506 Total Ps. 6,235,466 Ps. 5,957,192

CONTROLLING INTEREST EQUITY

CONTROLLING INTEREST EQUITY	12 Months Ended
	Dec. 31, 2017
Disclosure of controlling interest equity [Abstract]
Disclosure of share capital, reserves and other equity interest [text block]	NOTE 25 – CONTROLLING INTEREST EQUITY Authorized, issued and outstanding shares as of December 31, 2017 and 2016 consisted of the following: December 31, 2017 December 31, 2016 Authorized shares 120,000,000,000 120,000,000,000 Subscribed fully paid shares 22,281,017,159 22,281,017,159 Total outstanding shares 22,281,017,159 22,281,017,159 The outstanding shares are as follows: Common voting shares (1) 15,173,180,765 15,254,876,823 Preferred non-voting shares (1) 7,107,836,394 7,026,140,336 (1) Since 2011, Grupo Aval allows its shareholders to convert their common shares into preferred shares. For the years ended December 31, 2017 and 2016, 81,696,058 and 12,086,836 common shares were converted into preferred shares, respectively. Preferred shares have the right to receive a preferential minimum dividend of one Colombian peso (Ps. 1) per semester per share. This preferential minimum dividend is only applicable when dividends declared for common shares are less than one Colombian peso (Ps. 1). Preferential minimum dividends are not cumulative. Appropriated retained earnings As of December 31, 2017, and December 31, 2016 the appropriation of retained earnings is as follows: December 31, 2017 December 31, 2016 Retained earnings Ps. 1,829,515 Ps. 919,601 Legal reserve 11,140 11,140 Statutory and voluntary reserves 5,333,763 5,591,387 Ps. 7,174,418 Ps. 6,522,128 Legal Reserve Grupo Aval and its subsidiaries in Colombia shall create a legal reserve through the appropriation of ten percent (10%) of the net profits of each year up to an amount equal to fifty percent (50%) of the subscribed capital stock. This reserve may be reduced below fifty percent (50%) of the subscribed capital stock to stem losses in excess of retained earnings. The legal reserve cannot be less than the percentage aforementioned except to cover losses in excess of retained earnings. Statutory and Voluntary Reserves The Statutory and voluntary reserves are determined during the Shareholders Meetings. Declared Dividends The dividends are decreed and paid to shareholders based on unconsolidated net income under Colombian IFRS for the immediately preceding semester: On October 25, 2016, The General Meeting of Shareholders of Grupo Aval approved the amendment of the Company's by-laws in order to present the financial statements of the Company for Colombian purpose on an annualized basis for the period between the 1st of January and the 31st of December of each year. Prior to such amendment, the Company's bylaws specified the semi-annual presentation of local financial statements for the periods from January 1st to June 30th and July 1st to December 31st of each year. December 31, 2017 June 30, 2016 December 31, 2015 Net income for the periods ended in 1,053,594 1,258,835 1,086,061 Cash dividends declared Ps. In the general assembly held in March 2017, 58.80 pesos per share payable in twelve installments of 4.90 pesos per share, from April 2017 to March 2018. Ps. 29.40 per share payable in six (6) installments of P.s. 4.90 per share between October 2016 and March 2017 (based on profits from the first half of 2016) Ps. 29.40 per share payable in six (6) installments of P.s. 4.90 per share between April 2016 and September 2016 (based on profits from the second half of 2015) Common shares outstanding 15,240,124,702 15,258,916,143 15,265,983,336 Preferred shares outstanding 7,040,892,457 7,022,101,016 7,015,033,823 Total outstanding shares 22,281,017,159 22,281,017,159 22,281,017,159 Total dividends declared 1,310,124 655,062 655,062 Net income per share a) Basic net income per share Grupo Aval calculates basic net income per share by dividing net income for the year attributable to controlling interest of Grupo Aval parent company by the weighted average number of shares outstanding during the year (including common and preferred shares). The following table summarizes the net income per share for the year ended as of December 31, 2017, 2016 and 2015: December 31, December 31, December 31, Net income for the year Ps. 3,162,433 Ps. 3,516,936 Ps. 3,345,686 Less: participation of non- controlling interests (1,200,019 ) (1,377,070 ) (1,304,322 ) Net income attributable to controlling interest 1,962,414 2,139,866 2,041,364 Less: preferred dividends declared - - - Less: Allocation of undistributed earnings to preferred stockholders (1)(2) (622,215 ) (674,042 ) (638,734 ) Net Income allocated to common shareholders for basic and diluted EPS 1,340,199 Ps. 1,465,824 Ps. 1,402,630 Weighted average number of common shares outstanding used in basic EPS calculation (2) 15,216,468,601 15,262,660,115 15,309,380,685 Basic and Diluted earnings per share to common shareholders (pesos) 88.076 96.040 91.619 Basic and Diluted earnings per ADS in pesos (3) 1,761.51 1,920.80 1,832.38 Weighted average of the common and preferred shares used in the calculation of net income for basic shares (common and preferential) 22,281,017,159 22,281,017,159 22,281,017,159 Basic net income of the owners of the parent per share 88.076 96.040 91.619 (1) Based on a weighted average of 7,064,548,558 preferred shares for 2017, 7,018,357,044 preferred shares for 2016 and 6,971,636,474 preferred shares for 2015 (2) Averages based on an end of month number of preferred or common shares (3) Each ADS represents 20 preferred shares b) Diluted net income per share At December 31, 2017, 2016 and 2015, Grupo Aval did not have any dilutive instruments. Consolidated Comprehensive Income: Components of Accumulated Other Comprehensive Income for the years ended December 31, 2017, 2016 and 2015 are as follows: Unrealized gains (losses) on Net investment Hedging Hedging non- Cash flow Foreign Debt securities Equity Investments in Actuarial Income Total Non- Owners of Beginning balance 2015 Ps. 1,366,620 Ps. (870,911 ) Ps. (483,633 ) Ps. (29,257 ) Ps. 26,361 Ps. (298,345 ) Ps. 461,923 Ps. 79,858 Ps. 2,841 Ps. 442,582 Ps. 698,038 Ps. 325,710 Ps. 372,328 Current-period change 2,366,849 (1,683,346 ) (755,431 ) 17,500 24,878 (922,083 ) (6,548 ) 31,964 6,162 1,198,614 278,559 112,758 165,801 Ending balance 2015 Ps. 3,733,469 Ps. (2,554,257 ) Ps. (1,239,064 ) Ps. (11,757 ) Ps. 51,239 Ps. (1,220,428 ) Ps. 455,375 Ps. 111,822 Ps. 9,003 Ps. 1,641,196 Ps. 976,597 Ps. 438,468 Ps. 538,129 Current-period change (475,000 ) 291,506 35,819 17,967 (125,161 ) 948,212 34,509 (20,061 ) (41,228 ) (364,356 ) 302,207 90,719 211,488 Ending balance 2016 Ps. 3,258,469 Ps. (2,262,751 ) Ps. (1,203,245 ) Ps. 6,210 Ps. (73,922 ) Ps. (272,216 ) Ps. 489,884 Ps. 91,761 Ps. (32,225 ) Ps. 1,276,840 Ps. 1,278,804 Ps. 529,187 Ps. 749,617 Current-period change (47,197 ) 16,832 30,568 (2,340 ) (91,497 ) 284,480 57,245 1,128 (100,232 ) (73,617 ) 75,370 38,121 37,249 Ending balance 2017 Ps. 3,211,272 Ps. (2,245,919 ) Ps. (1,172,677 ) Ps. 3,870 Ps. (165,419 ) Ps. 12,264 Ps. 547,129 Ps. 92,889 Ps. (132,457 ) Ps. 1,203,223 Ps. 1,354,174 Ps. 567,308 Ps. 786,866

NON- CONTROLLING INTEREST

NON- CONTROLLING INTEREST	12 Months Ended
	Dec. 31, 2017
Disclosure of non-controlling interest [Abstract]
Disclosure of interests in subsidiaries [text block]	NOTE 26 – NON- CONTROLLING INTEREST The following table includes financial information regarding each subsidiary of Grupo Aval that has significant non controlling interests at December 31, 2017 and 2016: December 31, 2017 Entity Country Non- Non-controlling Non-controlling Dividends paid to Corporación Financiera Colombiana S.A. Colombia 55.21 % 3,448,933 462,137 (340,381 ) Banco Bogotá S.A. Colombia 31.26 % 5,395,664 619,515 (322,985 ) Banco de Occidente S.A. Colombia 27.73 % 256,858 65,941 (84,339 ) Banco Popular S.A. Colombia 6.26 % 184,126 25,163 (6,690 ) Banco Comercial AV Villas S.A. Colombia 20.13 % 298,651 27,263 (14,353 ) Total Ps. 9,584,231 Ps. 1,200,019 Ps. (768,748 ) December 31, 2016 Entity Country Non- Non-controlling Non-controlling Dividends paid to Corporación Financiera Colombiana S.A. Colombia 55.51 % 3,154,158 590,036 (294,376 ) Banco Bogotá S.A. Colombia 31.26 % 4,882,747 685,073 (332,460 ) Banco de Occidente S.A. Colombia 27.73 % 568,263 53,256 (83,166 ) Banco Popular S.A. Colombia 6.26 % 165,150 12,347 (9,529 ) Banco Comercial AV Villas S.A. Colombia 20.13 % 287,351 36,358 (7,668 ) Total Ps. 9,057,669 Ps. 1,377,070 Ps. (727,199 ) The following table includes information regarding each subsidiary of Grupo Aval that has significant non- controlling interests to December 31, 2017 and 2016: December 31, 2017 Entity Assets Liabilities Total Income Net Income OCI Cash Flow from Corporación Financiera Colombiana S.A. 21,115,000 15,872,265 2,313,589 563,553 615,754 3,428,076 Banco Bogotá S.A. 149,389,133 131,197,065 16,396,415 2,132,951 880,565 1,571,203 Banco de Occidente S.A. 37,746,874 33,342,596 4,132,220 377,686 187,037 797,598 Banco Popular S.A. 22,322,103 19,651,056 2,537,768 205,694 153,208 756,955 Banco Comercial AV Villas S.A. 12,318,124 10,853,638 1,645,948 137,695 788 (1,295,251 ) December 31, 2016 Entity Assets Liabilities Total Income Net Income OCI Cash Flow from Corporación Financiera Colombiana S.A. 20,504,644 15,604,999 2,135,834 671,336 537,304 1,378,419 Banco Bogotá S.A. (*) 141,430,749 124,192,566 18,141,612 4,432,026 970,007 313,112 Banco de Occidente S.A. 35,568,507 31,177,321 4,054,750 627,993 242,389 (402,394 ) Banco Popular S.A. 20,731,144 18,052,231 2,478,501 181,075 278,374 (106,977 ) Banco Comercial AV Villas S.A. 12,466,634 11,063,550 1,554,428 179,550 (19,599 ) 216,083 (*) Includes Ps. 2,208,053 related to the effect of the deconsolidation of Corficolombiana, refer to Note 1 for more information.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2017
Disclosure of Commitments and Contingencies [Abstract]
Disclosure of commitments and contingent liabilities [text block]	NOTE 27 – COMMITMENTS AND CONTINGENCIES Credit Commitments As part of our operations, Grupo Aval grants guarantees and letters of credit to its customers wherein Grupo Aval financial subsidiaries are irrevocably committed to make payments to third parties when customers do not comply with their obligations with such third parties, these products have the same policies for approval of disbursements of loans regarding client’ credit risk and guarantees required according to the circumstances of each client. The commitments for credit extension represent unused portions of authorizations to grant loans, use of credit cards, overdraft quotas and letters of credit. With respect to credit risk over commitments to extend credit lines, Grupo Aval is potentially exposed to losses in an amount equal to the total amount of unused commitments, if the unused amount were to be withdrawn in whole. However, the amount of the loss is less that the total amount of commitments unused, since most commitments to extend credits are contingent once the customer maintains the specific of credit risk standards. Grupo Aval monitors maturity terms of commitments regarding credit quotas, because long-term commitments have a higher credit risk than short-term commitments. Pending unused credit lines and guarantees do not necessarily represent future cash out flows, because such quotas may expire and not be used whole or in part. Following is the detail of the guarantees, letters of credit and credit commitments on non-used credit lines as of December 31, 2017 and 2016. Commitments in unused lines of credit December 31, 2017 December 31, 2016 Notional Fair Notional Fair Guarantees Ps. 3,495,921 Ps. 58,936 Ps. 3,510,546 Ps. 61,030 Unused letters of credit 1,177,697 10,314 1,084,589 4,569 Unused limits of overdrafts 75,225 - 128,621 - Unused credit card limits 18,025,620 - 17,383,743 - Other 4,448,775 - 5,480,222 - Total Ps. 27,223,238 Ps. 69,250 Ps. 27,587,721 Ps. 65,599 Following is the detail of the credit commitments by type of currency: December 31, December 31, Colombian Pesos Ps. 10,271,676 Ps. 13,608,215 U.S. dollars 16,589,399 13,626,359 Euro 85,887 37,263 Other 276,276 315,884 Total Ps. 27,223,238 Ps. 27,587,721 Capital Expenses Commitments As of December 31, 2017 and 2016, Grupo Aval had contractual disbursement commitments of capital expenditures for Ps.110,681 and Ps. 62,885, respectively. Operating Lease Commitments During the development of its operations, Grupo Aval executes contracts in order to receive property, plant and equipment in operating leasing, as well as certain intangibles; following is the detail of rent payment commitments of operating leasing in the forthcoming years: December 31, December 31, Up to one year Ps. 246,373 Ps. 200,796 Greater than one year and up to five years 526,557 544,148 More than five years 233,239 309,696 Total Ps. 1,006,169 Ps. 1,054,640 Contingencies As of December 31, 2017 and 2016, Grupo was party to administrative and legal proceedings as defendant; the claims of the proceedings were assessed based on analyses and opinions of responsible lawyers. The following legal contingencies were determined: Labor Proceedings As of December 31, 2017 and 2016, labor complaints had been recognized for Ps. 105,748 and Ps. 30,358 respectively. Historically, the majority of these proceedings have been resolved in favor of Grupo Aval. Civil Proceedings As of December 31, 2017 and 2016, the result of the assessment of the claims of legal proceedings for civil suits, not including those with remote probability, reached an amount of Ps. 453,592 and Ps. 432,334 respectively. Administrative Proceedings and Other Proceedings Claims derived from administrative and judicial tax proceedings, filed by national and local tax authorities may establish, in some cases, sanctions in which Grupo Aval and its affiliates may incur as a result of: (i) the performance of their duty as a collector of national and local taxes, and/or (ii) a higher value in their obligations as taxpayers. As of December 31, 2017 and 2016, the amount of the claims reached the sum of Ps. 81,117 and Ps. 42,723 respectively.

INCOME (EXPENSE) COMMISSIONS AN

INCOME (EXPENSE) COMMISSIONS AND FEES	12 Months Ended
	Dec. 31, 2017
Disclosure of Income or Expenses Commissions And Fees [Abstract]
Disclosure of Fees and commissions [Text Block]	NOTE 28 – INCOME (EXPENSE) COMMISSIONS AND FEES Below is a detail of the expenses for commissions and fees for the years ended as of December 31, 2017, 2016 and 2015: Income from commissions and fees December 31, December 31, December 31, Commissions on banking services Ps. 2,567,704 Ps. 2,436,692 Ps. 1,751,527 Fees on credit cards 1,112,319 1,034,763 1,223,189 Pension and severance fund management 926,771 824,089 787,692 Trust activities 311,837 275,719 233,892 Storage services 169,815 186,068 167,323 Commissions on drafts, checks and checkbooks 60,768 67,832 71,294 Office network services 42,639 43,508 39,709 Other commissions 10,272 10,516 9,607 Total Ps. 5,202,125 Ps. 4,879,187 Ps. 4,284,233 Commissions and Fees Expenses December 31, December 31, December 31, Banking Services Ps. (332,811 ) Ps. (318,672 ) Ps. (288,303 ) Sales and Services Commissions (119,987 ) (99,659 ) (90,202 ) Affiliations to Pension Funds (74,531 ) (68,454 ) (67,854 ) Offices Network Services (29,874 ) (33,404 ) (34,437 ) Information Processing Services of Operators (23,039 ) (20,963 ) (18,273 ) Collection Service of Contributions to Financial Entities (5,618 ) (6,084 ) (4,962 ) Fiduciary Businesses (41 ) (256 ) (238 ) Banks Guarantees (88 ) (87 ) (131 ) Credit Cards (2 ) (14 ) (110 ) Other (37,123 ) (71,935 ) (117,436 ) Total Ps. (623,114 ) Ps. (619,528 ) Ps. (621,946 ) Net commission and fee income 4,579,011 4,259,659 3,662,287

NET TRADING INCOME

NET TRADING INCOME	12 Months Ended
	Dec. 31, 2017
Disclosure of Net Trading Income [Abstract]
Disclosure of trading income [text block]	NOTE 29 – NET TRADING INCOME Net trading income includes income from client driven trading activities primarily conducted in markets, including foreign Exchange, Credit, Rates and Equities trading, as follows: December December December Trading investment income (1) Fixed income securities Ps. 218,994 Ps. 369,184 Ps. 143,179 Equities 177,448 127,431 41,997 Total trading investment income Ps. 396,442 Ps. 496,615 Ps. 185,176 Derivatives income Net income (loss) on financial derivatives (2) Ps. (75,224 ) Ps. 10,593 (156,820 ) Other trading income (3) 240,144 217,490 216,843 Total derivatives income Ps. 164,920 Ps. 228,083 Ps. 60,023 Total net trading income Ps. 561,362 Ps. 724,698 Ps. 245,199 (1) Includes net trading income from investment securities held for trading, that reflects the interest from investment in debt securities, gains/losses from mark-to-market valuation from investment in equity and debt securities and net income from trading activities. (2) Includes net trading income from derivatives, which reflects the gains/losses from mark-to-market valuation on trading derivatives. (3) Includes gains/losses from: (i) Net changes in the valuation of hedging derivatives from mark-to-market valuations from unhedged , (ii) the ineffective portion of the hedge, (iii) Transfers of due hedging derivatives from OCI to the statement of income.

OTHER INCOME AND EXPENSE

OTHER INCOME AND EXPENSE	12 Months Ended
	Dec. 31, 2017
Disclosure of Other income and expense [Abstract]
Disclosure of other operating income (expense) [text block]	NOTE 30 – OTHER INCOME AND EXPENSE Below is a detail of the other income and expense in the years ended December 31, 2017, 2016 and 2015: Other Income December 31, December 31, December 31, Income from non-financial sector entities (*) Ps. 757,023 Ps. 929,294 Ps. 838,578 Foreign exchange gains (losses), net 424,483 517,902 457,904 Share of profit of equity accounted investees, net of tax 171,964 140,765 230,398 Net gain on sale of debt and equity securities 51,712 210,373 79,233 Dividends 50,439 28,027 33,611 Gain on the sale of non-current assets held for sale 13,568 28,392 26,211 Other income 439,579 750,648 723,361 Total Ps. 1,908,768 Ps. 2,605,401 Ps. 2,389,296 Other Expense December 31, December 31, December 31, Personnel expenses Ps. 3,671,117 Ps. 3,531,087 Ps. 3,111,306 Taxes and fees 731,316 633,260 557,046 Depreciation and amortization 521,408 471,608 488,212 Consultancy, audit and other fees 460,978 355,590 282,181 Affiliation contributions and transfers 429,825 428,581 349,961 Wealth tax (**) 101,988 267,627 303,193 Leases (Rent) 431,507 440,777 396,922 Maintenance and repairs 392,271 317,170 209,804 Insurance 351,745 316,852 282,452 Markenting 314,657 344,423 299,281 Warehouse services 277,849 288,491 276,343 Transportation services 166,429 160,002 150,866 Cleaning and security services 131,451 138,693 135,299 Outsoursing services 128,656 184,330 131,236 Supplies and stationary 82,113 23,722 44,514 Electronic data processing 73,872 81,682 66,813 Adaptation and installation 62,809 67,938 57,566 Travel expenses 48,193 54,275 49,876 Other 450,652 413,665 416,244 Total Ps. 8,828,836 Ps. 8,519,773 Ps. 7,609,115 (*) Income from the non-financial sector, net results from revenues amounting to Ps 5,792,850, Ps 6,654,622 and Ps 5,198,754 less costs and expenses of Ps 5,035,827, Ps 5,725,328 and Ps 4,360,176 for the years ended 2017, 2016 and 2015, respectively. (**) Grupo Aval and its subsidiaries in Colombia are subject to wealth tax for the years 2015, 2016 and 2017 by Law 1739 of 2014, based on their fiscal net asset value as of January 1, 2015, 2016 and 2017, greater or equal to Ps. 1,000, less the exclusions expressly provided for in the tax regulation, including the net asset value of the shares held in national companies. The wealth tax is calculated at progressive rates depending on the amount of liquid equity, and rates range between 0.20% and 1.15% in 2015, 0.15% and 1% in 2016, and 0.05% and 0.40% in 2017.

ANALYSIS OF OPERATING SEGMENTS

ANALYSIS OF OPERATING SEGMENTS	12 Months Ended
	Dec. 31, 2017
Disclosure of Analysis of Operating Segment [Abstract]
Disclosure of operating segments [text block]	NOTE 31 – ANALYSIS OF OPERATING SEGMENTS Operating segments are components of Grupo Aval responsible for developing commercial activities that can generate revenue or incur expenses and whose operating profit or loss are regularly reviewed by the Board of Directors of Grupo Aval, and for which financial information is available: Until June 20, 2016, Grupo Aval was organized into four business segments, however, due to the legal reorganization explained in Note 1, the information provided to the Board of Directors has been updated and adjusted to present five segments considering Corficolombiana as an additional reportable segment. 31.1 Description of products and services from which each reportable segment derives its income Grupo Aval is organized into five business segments comprised by the four main banks (see note 1 Corficolombiana is consolidated directly by Grupo Aval and not through Banco de Bogotá) of Grupo Aval: Banco de Bogotá, Banco de Occidente, Banco AV Villas and Banco Popular. All these banks and Corficolombiana, provide services relating to banking activity in Colombia and others countries in commercial, consumer, mortgage housing and microcredit banking. Corficolombiana´s core business is the active management of an equity portfolio. 31.2 Factors used by management to identify reportable segments Operating segments identified above are based on the strategic organization of Grupo Aval in order to serve different sectors of the economy in Colombia. 31.3 Measurement of net income, assets and liabilities of operating segments The Board of Directors of Grupo Aval reviews the financial information of each of its operating segments and assesses the performance of each segment based on the income statement of each of them and on certain credit risk indicators, as described in note 2.28. 31.4 Income Following is the detail of the reportable financial information summarized for each segment as of December 31, 2017, 2016 and 2015: Statement of Financial Position December 31, 2017 Banco de Banco de Banco Popular Banco AV Corficolombiana (1) Eliminations and other segments Total Assets Held-for-trading financial assets Ps. 2,590,371 Ps. 584,470 Ps. 217,354 Ps. 328,070 Ps. 1,577,734 Ps. (169,911 ) Ps. 5,128,088 Available-for-sale financial assets 9,949,001 4,526,311 2,172,140 396,128 2,541,683 (971,103 ) 18,614,160 Held-to-maturity Investments 1,367,582 689,023 483,796 274,150 84,488 - 2,899,039 Investments in associates and joint ventures 3,417,702 672,169 10,965 1,597 820,125 (3,879,544 ) 1,043,014 Loans and receivables 104,243,806 27,480,881 17,034,186 9,977,597 2,785,100 (767,275 ) 160,754,295 Other Assets 27,820,671 3,794,020 2,403,662 1,340,582 13,305,870 (564,861 ) 48,099,944 Total Assets Ps. 149,389,133 Ps. 37,746,874 Ps. 22,322,103 Ps. 12,318,124 Ps. 21,115,000 Ps. (6,352,694 ) Ps. 236,538,540 Liabilities Customer Deposits 100,947,244 26,169,109 15,968,499 10,086,106 4,095,692 (2,381,426 ) 154,885,224 Financial Obligations 25,294,735 5,802,728 2,778,675 212,914 8,875,171 2,311,813 45,276,036 Other Liabilities 4,955,086 1,370,759 903,882 554,618 2,901,402 (179,694 ) 10,506,053 Total Liabilities Ps. 131,197,065 Ps. 33,342,596 Ps. 19,651,056 Ps. 10,853,638 Ps. 15,872,265 Ps. (249,307 ) Ps. 210,667,313 Statement of Income for the year 2017 Banco de Banco de Banco Popular Banco AV Corficolombiana (1) Eliminations and other segments Total External Income Interest income Ps. 11,241,897 Ps. 3,450,056 Ps. 2,196,753 Ps. 1,305,784 Ps. 547,028 Ps. 315 Ps. 18,741,833 Commission and fee income 4,187,221 396,658 224,233 250,824 95,086 48,103 5,202,125 Participation in profit or loss associates and joint business 5,847 2,402 2,622 2,043 159,050 - 171,964 Dividends 1,321 370 1,991 1,514 45,243 - 50,439 Other Income 819,797 49,916 94,577 62,642 1,413,594 17,138 2,457,664 Ps. 16,256,083 Ps. 3,899,402 Ps. 2,520,176 Ps. 1,622,807 Ps. 2,260,001 Ps. 65,556 Ps. 26,624,025 Intersegment Income Interest income Ps. 72,910 Ps. 1,818 Ps. 1,047 Ps. 4,797 Ps. 62,097 Ps. (142,669 ) Ps. - Commission and fee income 2,988 5,171 4,133 15,065 1,339 (28,696 ) - Participation in profit or loss associates and joint business 36,782 139,555 (376 ) 132 159 (176,252 ) - Dividends 3,101 5,494 6,810 1,170 1,244 (17,819 ) - Other Income 24,551 80,780 5,978 1,977 (11,251 ) (102,035 ) - 140,332 232,818 17,592 23,141 53,588 (467,471 ) - Total income Ps. 16,396,415 Ps. 4,132,220 Ps. 2,537,768 Ps. 1,645,948 Ps. 2,313,589 Ps. (401,915 ) Ps. 26,624,025 Expenses Interest expense Ps. 4,594,100 Ps. 1,388,144 Ps. 977,441 Ps. 423,069 Ps. 852,501 Ps. (7,556 ) Ps. 8,227,699 Impairment loss on loan and other accounts receivable 2,459,293 993,350 258,926 327,833 79,932 - 4,119,334 Depreciations and amortizations 361,621 69,255 45,417 29,897 5,881 9,337 521,408 Commission and fee expense 351,073 94,089 86,228 108,572 10,772 (27,620 ) 623,114 Administrative Expenses 3,035,346 703,106 520,204 375,522 119,271 (240,301 ) 4,513,148 Other expense 2,491,824 390,812 334,944 180,186 241,636 64,693 3,704,095 Income tax expense 970,207 115,778 108,914 63,174 440,043 54,678 1,752,794 Total Expenses 14,263,464 3,754,534 2,332,074 1,508,253 1,750,036 (146,769 ) 23,461,592 Net income for the year Ps. 2,132,951 Ps. 377,686 Ps. 205,694 Ps. 137,695 Ps. 563,553 Ps. (255,146 ) Ps. 3,162,433 (1) Includes Grupo Aval, Grupo Aval Limited, Grupo Aval International Limited and ATH negocio conjunto. Statement of Financial Position December 31, 2016 Banco de Banco de Banco Popular Banco AV Corficolombiana (2) Eliminations and other segments Total Assets Held-for-trading financial assets Ps. 2,179,411 Ps. 645,607 Ps. 228,176 Ps. 182,936 Ps. 1,499,533 Ps. (141,938 ) Ps. 4,593,725 Available-for-sale financial assets 9,157,156 3,991,626 2,046,466 1,478,433 2,773,149 (1,054,318 ) 18,392,512 Held-to-maturity Investments 1,256,607 542,008 409,131 250,980 111,760 - 2,570,486 Investments in associates and joint ventures 3,354,551 570,782 9,103 - 932,586 (3,720,375 ) 1,146,647 Loans and receivables 97,169,521 26,573,862 16,016,683 8,981,858 3,141,864 (985,056 ) 150,898,732 Other Assets 28,313,503 3,244,622 2,021,585 1,572,427 12,045,752 (726,270 ) 46,471,619 Total Assets Ps. 141,430,749 Ps. 35,568,507 Ps. 20,731,144 Ps. 12,466,634 Ps. 20,504,644 Ps. (6,627,957 ) Ps. 224,073,721 Liabilities Customer Deposits 93,676,674 24,176,056 14,733,350 9,706,084 3,846,793 (2,251,902 ) 143,887,055 Financial Obligations 25,863,311 5,504,607 2,451,314 975,300 9,288,278 1,433,471 45,516,281 Other Liabilities 4,652,581 1,496,658 867,567 382,166 2,469,928 142,263 10,011,163 Total Liabilities Ps. 124,192,566 Ps. 31,177,321 Ps. 18,052,231 Ps. 11,063,550 Ps. 15,604,999 Ps. (676,168 ) Ps. 199,414,499 Statement of Income of the year 2016 (1) Banco de Bogotá S.A. Banco de Banco Popular Banco AV Corficolombiana (1), (2) Eliminations and other segments Total External Income Interest income Ps. 10,481,965 Ps. 3,363,556 Ps. 2,042,878 Ps. 1,193,544 Ps. 442,398 Ps. 22,629 Ps. 17,546,970 Commission and fee income 3,957,774 387,986 219,717 237,762 63,763 12,185 4,879,187 Participation in profit or loss associates and joint business (4,275 ) (484 ) 388 729 144,407 - 140,765 Dividends 1,779 1,150 3,112 2,941 18,973 72 28,027 Other Income 1,336,185 93,860 183,931 99,701 1,647,967 (19,355 ) 3,342,289 Ps. 15,773,428 Ps. 3,846,068 Ps. 2,450,026 Ps. 1,534,677 Ps. 2,317,508 Ps. 15,531 Ps. 25,937,238 Intersegment Income Interest income Ps. 219,995 Ps. 2,893 Ps. 848 Ps. 6,223 Ps. 75,641 Ps. (305,600 ) Ps. - Commission and fee income 900 4,386 2,282 13,170 2,115 (22,853 ) - Participation in profit or loss associates and joint business 116,488 118,109 (1,206 ) (1,923 ) 100 (231,568 ) - Dividends - 20,336 25,293 - 944 (46,573 ) - Other Income 1,996,738 62,959 115 1,610 (79,493 ) (1,981,929 ) - 2,334,121 208,683 27,332 19,080 (693 ) (2,588,523 ) - Total income Ps. 18,107,549 Ps. 4,054,751 Ps. 2,477,358 Ps. 1,553,757 Ps. 2,316,815 Ps. (2,572,992 ) Ps. 25,937,238 Expenses Interest expense Ps. 4,568,469 Ps. 1,455,389 Ps. 995,070 Ps. 451,224 Ps. 947,603 Ps. (25,350 ) Ps. 8,392,405 Impairment loss on loan and other accounts receivable 1,897,902 579,471 229,948 236,434 59,176 1,253 3,004,184 Depreciations and amortizations 352,618 64,252 40,449 24,787 4,513 (15,011 ) 471,608 Commission and fee expense 347,612 99,804 83,857 98,738 8,970 (19,453 ) 619,528 Administrative Expenses 2,943,832 632,153 501,664 324,787 138,626 (131,863 ) 4,409,199 Other expense 2,414,696 363,398 293,930 158,243 104,944 131,258 3,466,469 Income tax expense 1,150,393 232,292 151,365 79,994 381,647 61,218 2,056,909 Total Expenses 13,675,522 3,426,759 2,296,283 1,374,207 1,645,479 2,052 22,420,302 Net income for the year Ps. 4,432,027 Ps. 627,992 Ps. 181,075 Ps. 179,550 Ps. 671,336 Ps. (2,575,044 ) Ps. 3,516,936 (1) Includes Ps. 2,208,053 of income resulting from the desconsolidation of Corficolombiana. (2) Includes Grupo Aval, Grupo Aval Limited and Grupo Aval International Limited. December 31, 2015 Statement of Income Banco de Banco de Banco Popular Banco Av Corficolombiana (1) Eliminations and other segments Total External Income Interest income Ps. 8,511,619 Ps. 2,648,326 Ps. 1,623,643 Ps. 986,384 Ps. 304,109 Ps. 1,517 Ps. 14,075,598 Commission and fee income 3,432,513 394,039 180,302 218,769 58,610 - 4,284,233 Participation in profit or loss associates and joint business 178,243 20,674 2,002 1,523 27,956 - 230,398 Dividends 417 2,638 2,534 1,909 26,113 - 33,611 Other Income 706,302 105,337 162,605 90,644 1,263,449 195,244 2,523,581 Ps. 12,829,094 Ps. 3,171,014 Ps. 1,971,086 Ps. 1,299,229 Ps. 1,680,237 Ps. 196,761 Ps. 21,147,421 Intersegment income Interest income Ps. (32,382 ) Ps. 2,570 Ps. 633 Ps. 2,467 Ps. 30,274 Ps. (3,562 ) Ps. - Commission and fee income 471 4,752 3,091 11,895 2,693 (22,902 ) - Participation in profit or loss associates and joint business (1,439 ) 75,227 (1,229 ) (2,055 ) 178,305 (248,809 ) - Dividends 2,105 25,127 30,989 - - (58,221 ) - Other Income 207,102 75,435 148 1,493 1,482 (285,660 ) - Total Segments income Ps. 175,857 Ps. 183,111 Ps. 33,632 Ps. 13,800 Ps. 212,754 Ps. (619,154 ) Ps. - Total income 13,004,951 3,354,125 2,004,718 1,313,029 1,892,991 (422,393 ) 21,147,421 Banco de Banco de Banco Popular Banco Av Corficolombiana Eliminations and Total Expenses Interest expense Ps. 3,211,117 Ps. 989,836 Ps. 583,151 Ps. 273,944 Ps. 607,989 Ps. 85,422 Ps. 5,751,459 Loan and other accounts receivable 1,323,338 544,143 63,180 188,895 8,468 (274 ) 2,127,750 Depreciations and amortizations 358,517 61,396 39,130 22,571 5,810 788 488,212 Commission and fee expense 327,250 151,038 54,774 85,195 18,013 (14,324 ) 621,946 Administrative Expenses 2,508,967 586,050 465,226 302,765 90,812 (75,034 ) 3,878,786 Other expense 2,168,527 352,957 276,905 155,355 73,262 27,606 3,054,612 Income tax expense 1,047,656 195,606 173,060 108,704 330,889 23,055 1,878,970 Total Expenses 10,945,372 2,881,026 1,655,426 1,137,429 1,135,243 47,239 17,801,735 Net income for the year Ps. 2,059,579 Ps. 473,099 Ps. 349,292 Ps. 175,600 Ps. 757,748 Ps. (469,632 ) Ps. 3,345,686 (1) Includes Grupo Aval, Grupo Aval Limited and Grupo Aval International Limited. Main eliminations of total income, expenses, assets and liabilities between segments with the corresponding consolidated entries at the level of Grupo Aval are: · Loans with financial obligations of entities mainly from non financial sector. · Investments in term deposits and outstanding bonds of in other segments. · Investments in subordinates elimination and record of non- controlling interests. · Expenses and incomes for commissions. 31.5 Analysis of Revenues by Products and Services Grupo Aval’s revenues are analyzed by products and services, in the statement of income. 31.6 Income by Country Grupo Aval’s revenues for each individual country for which revenues are significant, are the following during the years ended December 31, 2017, 2016 and 2015: December 31, 2017 December 31, 2016 December 31, 2015 Colombia Ps. 18,789,167 Ps. 18,548,030 Ps. 15,749,556 Panamá 1,410,766 1,333,843 1,293,132 Costa Rica 2,752,109 2,598,446 1,778,560 Guatemala 1,132,646 1,084,436 1,027,948 Other countries 2,539,337 2,372,483 1,298,225 Total Consolidated Revenues Ps. 26,624,025 Ps. 25,937,238 Ps. 21,147,421 The foregoing analysis is based on the customer's domicile. Income from off- shore entities of Colombian customers are reported as income from Colombia. The revenues include income for interest, fees, commissions and other operating income. 31.7 Non current assets by Country Grupo Aval’s non current assets for each individual country for which non current assets are significant, are as follows as at December 31, 2017 and 2016: December 31, 2017 Own – use Property, plant (*) Intangible assets Colombia Ps. 4,635,899 Ps. 5,868,867 Panamá 203,824 3,657,236 Costa Rica 366,800 89,343 Guatemala 98,778 16,714 Other countries 494,696 1,231,744 Total Ps. 5,799,997 Ps. 10,863,904 (*) see notes 16 to 18. December 31, 2016 Own – use Property, plant (*) Intangible assets Colombia Ps. 4,702,347 Ps. 5,496,699 Panamá 208,727 3,681,756 Costa Rica 376,984 113,009 Guatemala 97,798 14,110 Other countries 513,393 1,059,718 Total Ps. 5,899,249 Ps. 10,365,292 (*) see notes 16 to 18. During the years ended December 31, 2017, 2016 and 2015, Grupo Aval’s reported no concentration of revenue in customers with more than a 10% share of revenue from ordinary activities.

OFFSET OF FINANCIAL ASSETS AND

OFFSET OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES	12 Months Ended
	Dec. 31, 2017
Disclosure of Offset of Financial Assets With Financial Liabilities [Abstract]
Disclosure of offsetting of financial assets and financial liabilities [text block]	NOTE 32 – OFFSET OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES Following is a detail of the financial instruments subject to offset contractually required as of December 31, 2017 and 2016: December 31, 2017 Gross Amounts Not Gross Gross Net Amounts Financial Cash Net Offsetting assets Derivatives Ps. 526,148 Ps. (142,495 ) Ps. 383,653 Ps. (2,756 ) Ps. (45,387 ) Ps. 335,510 Repurchase agreements 2,544,676 - 2,544,676 (2,544,676 ) - - Total Ps. 3,070,824 Ps. (142,495 ) Ps. 2,928,329 Ps. (2,547,432 ) Ps. (45,387 ) Ps. 335,510 Gross Amounts Not Gross Amounts of Recognized Liabilities Gross Net Amounts Financial Cash Net Offsetting liabilities Derivatives 446,526 (134,397 ) 312,129 (2,831 ) (33,182 ) 276,116 Repurchase agreements 3,531,531 - 3,531,531 (3,721,846 ) - (190,315 ) Total Ps. 3,978,057 Ps. (134,397 ) Ps. 3,843,660 Ps. (3,724,677 ) Ps. (33,182 ) Ps. 85,801 December 31, 2016 Gross Amounts Not Gross Gross Net Amounts Financial Cash Net Offsetting assets Derivatives Ps. 864,460 Ps. (233,772 ) Ps. 630,688 Ps. (4,890 ) Ps. (40,241 ) Ps. 585,557 Repurchase agreements 711,950 - 711,950 (671,028 ) - 40,922 Total Ps. 1,576,410 Ps. (233,772 ) Ps. 1,342,638 Ps. (675,918 ) Ps. (40,241 ) Ps. 626,479 Gross Amounts Not Gross Amounts of Recognized Liabilities Gross Net Amounts Financial Cash Net Offsetting liabilities Derivatives 942,258 (258,127 ) 684,131 (51,030 ) (90,228 ) 542,873 Repurchase agreements 5,457,370 - 5,457,370 (5,264,105 ) - 193,265 Total Ps. 6,399,628 Ps. (258,127 ) Ps. 6,141,501 Ps. (5,315,135 ) Ps. (90,228 ) Ps. 736,138

UNCONSOLIDATED STRUCTURED ENTIT

UNCONSOLIDATED STRUCTURED ENTITIES	12 Months Ended
	Dec. 31, 2017
Disclosure of unconsolidated structured entities [abstract]
Disclosure of unconsolidated structured entities [text block]	NOTE 33 – UNCONSOLIDATED STRUCTURED ENTITIES The term "unconsolidated structured entities" refers to all structured entities that are not controlled by Grupo Aval. Grupo Aval enters into transactions with unconsolidated structured entities in the normal course of business to facilitate customer transactions and for specific investment opportunities. The table below shows the total assets of unconsolidated structured entities in which Grupo Aval had an interest at the reporting date and its maximum exposure to loss in relation to those interests. Nature and risks associated with Grupo Aval’s interests in unconsolidated structured entities December 31, 2017 Securitizations Grupo Total Grupo Aval’s interest-assets Investments at fair value through profit or loss Ps. 19,602 Ps. 3,030,499 Ps. 3,050,101 Other account receivables - 37,606 37,606 Total assets in relation to the Gupo Aval’s interests in the unconsolidated structured entities 19,602 3,068,105 3,087,707 Grupo Aval’s maximum exposure Ps. 19,602 Ps. 3,068,105 Ps. 3,087,707 December 31, 2016 Securitizations Grupo Total Grupo Aval’s interest-assets Investments at fair value through profit or loss Ps. 27,377 Ps. 2,719,217 Ps. 2,746,594 Other account receivables - 45,489 45,489 Total assets in relation to the Gupo Aval’s interests in the unconsolidated structured entities 27,377 2,764,706 2,792,083 Grupo Aval’s maximum exposure Ps. 27,377 Ps. 2,764,706 Ps. 2,792,083 Grupo Aval invests in asset-backed securities issued by securitization entities for which underlying assets are mortgages granted by financial institutions. Grupo Aval does not have a significant exposure to sub-prime securities. The asset-backed securities are denominated in local market TIPS and accounted for as investment at fair value through profit or loss. These asset-backed securities have different maturities and are generally classified by credit ratings. Also, Grupo Aval retains beneficial interests in the form of servicing fees on the securitized receivable and manages funds. In the normal course of operations, Grupo Aval has trust companies that manage collective investment funds and assets of third parties whose the managing trustees receive commissions. Additionally Grupo Aval has the subsidiary Fondo de Pensiones y Cesantias Porvenir that manages mandatory pension funds and defined contribution plans. For management services provided by the trust and Porvenir, commissions vary according to the conditions of each fund or asset managed are received. The obligations of these entities in the administration of these assets are of means and do not guarantee the results. The maximum exposure risk of loss is determined by the possible failures in the administration of the funds by the amount of the returns that manages and the return of the results of assets the clients.

TRANSFERS OF FINANCIAL ASSETS

TRANSFERS OF FINANCIAL ASSETS	12 Months Ended
	Dec. 31, 2017
Disclosure of transfers of financial assets [Abstract]
Disclosure of transfers of financial assets [text block]	NOTE 34 - TRANSFERS OF FINANCIAL ASSETS Grupo Aval enters into transactions in the normal course of business by which it transfers financial assets to third parties. Depending on the circumstances, these transfers may either result in these financial assets being derecognized or continuing to be recognized in Grupo Aval´s financial statements. A. Transferred financial assets not qualifying for full derecognition i. Sale and repurchase agreements Sales and repurchase agreements are transactions in which Grupo Aval sells securities and simultaneously agrees to repurchase them (or assets that are substantially the same) at a fixed price on a future date. Grupo Aval continues to recognize the securities in their entirety in the statement of financial position because it retains substantially all of the risks and rewards of ownership. The cash consideration received is recognized as a financial asset and a financial liability is recognized for the obligation to pay the repurchase price. Because Grupo Aval sells the contractual rights to the cash flows of the securities, it does not have the ability to use the transferred assets during the term of the arrangement. As of December 31, 2017, the financial investments debt securities available-for-sale that are being used as collateral in repo operations amounted Ps. 2,878,772 (December 31, 2016 Ps. 4,634,984) see Note 8, and financial assets held for trading that are being used as collateral in repo operations amounted Ps. 843,075 (December 31, 2016 Ps. 629,121) see Note 7. ii. Securities lending As of December 31, 2017 and 2016 Grupo Aval has not recorded securities lending. B. Transfer of financial assets that are derecognized in their entirety. I. Securitizations Certain securitization transactions undertaken by Grupo Aval result in the derecognizing transferred assets in their entirety. This is the case when Grupo Aval transfers substantially all of the risks and rewards of ownership of financial assets to unconsolidated securitization vehicle and retains a relatively small interest in the vehicle or a service arrangement in respect of the transferred financial assets. If the financial assets are derecognized in the entirety, then the interest in unconsolidated securitization vehicles that Grupo Aval receives as part of the transfer and the service arrangement represent continuing involvement with those assets. During the years ended at December 31, 2017, 2016 and 2015, Grupo Aval did not transfer financial assets to special purpose vehicles. However before 2014, a subsidiary bank made a transfer of mortgage loans to unconsolidated special purpose vehicles as the bank did not have control over them. As a result, the mortgages loans were derecognized of the financial statements as of January 1, 2014, taking the exception under IFRS 1. In the securitization process, Grupo Aval received investment securities as payment for the transferred assets classified as investments at fair value adjusted in profit or loss at December 31, 2017, 2016 and 2015. At present, the subordinate bank collects the accounts receivable transferred to the vehicle, and such collected amounts are immediately transferred to the special purpose vehicle in charge of such accounts. For collecting the payments, Grupo Aval receives 1% as commission fee based on the collected accounts receivable. A loss can potentially occur if the costs incurred in the execution of the collecting service exceed the commission fee revenue received. The table below explain in detail the assets at December 31, 2017, 2016 and 2015 that represent the continuing involvement of Grupo Aval with the accounts receivable transferred and revenue obtained during the collecting process of such loans. At the end of the year December 31, December 31, December 31, Financial assets (1) Ps. 19,602 Ps. 27,377 Ps. 38,975 Income for commission and fees Ps. 136 Ps. 96 Ps. 359 (1) Includes investments held for trading through profit or loss and available-for-sale investments. The financial assets held for trading through profit or loss securities in the special purpose vehicle which managed the loans and receivables represents Grupo Aval´s maximum exposure to loss from its continuing involvement in the form of notes issued by unconsolidated securitization vehicles is their carrying amount.

RELATED PARTIES

RELATED PARTIES	12 Months Ended
	Dec. 31, 2017
Disclosure of Related Parties [Abstract]
Disclosure of related party [text block]	NOTE 35 – RELATED PARTIES To verify the correct identification of relationships and transaction with related parties, Grupo Aval has established a specific written Procedure for the Identification and Disclosure of Balances and Transactions with Related Parties In addition, Grupo Aval Vice-Presidency of Accounting Consolidation periodically performs an evaluation of its controlling and non-controlling investments in other entities to identify if such entities should be treated as a related entity. In October 28, 2015, Grupo Aval’s board of directors approved a Reference Framework for Institutional Relations · Grupo Aval and its subsidiaries shall permanently carry out the registration of the operations performed with related parties, identifying the type of operation, its purpose, economic conditions and authorizations received when applicable. · Grupo Aval and its subsidiaries shall establish limits of indebtedness or exposure and perform constant monitoring of the intragroup operations, complying for such purpose with the restrictions set forth under applicable regulations. · All intragroup operations shall be fully identified by accounting areas of the respective entities. · Authorization levels are defined within the governance and control structure, assigned as may be deemed adequate as a function of the magnitude and type of transaction, keeping the evidence of such authorizations. · It should be verified that related party transactions are carried out for a good and valuable consideration, at market conditions, maintaining a financial equilibrium in the relationships between the entities participating in the operation. This Reference Framework for Institutional Relations Balances as of December 31, 2017 and 2016, with related parties, are detailed in the following tables: Individuals Entity December 31, 2017 Mr. Key Associates Entities Entities Assets Cash and equivalents Ps. - Ps. - Ps. 11 Ps. - Ps. 67 Financial assets in investments - - 910,310 1,249 - Financial assets in credit operations 3,066 10,665 1,492,067 1,301,697 3,385 Accounts receivable 11 33 59,588 4,421 - Other assets - - 156,636 3,661 18 Liabilities Deposits Ps. 21,257 Ps. 20,192 Ps. 2,535,339 Ps. 1,566,160 Ps. 1,275 Accounts payable 103 700 15,353 322,275 18,671 Financial obligations 4 10 16,435 1,249 - Other liabilities - 4 7,424 49 - Individuals Entity December 31, 2016 Mr. Key Associates Entities Entities Assets Cash and equivalents Ps. - Ps. - Ps. - Ps. - Ps. - Financial assets in investments - - 157,427 - - Financial assets in credit operations 3,897 9,520 1,809,972 1,276,534 24,695 Accounts receivable 3 28 157,725 8,781 125,532 Other assets - 1 41,168 30,068 - Liabilities Deposits Ps. 100,787 Ps. 39,431 Ps. 2,610,620 Ps. 446,802 Ps. 588 Accounts payable 73 582 16,215 641,363 37,831 Financial obligations 3 308 9,445 - - Other liabilities - - 1,984 3,982 - Transactions during the years ended as of December 31, 2017, 2016 and 2015, with related parties are as follows: a. Profit or loss Individuals Entity December 31, 2017 Mr. Key Associates Entities Entities Income Interest income Ps. 164 757 155,690 123,671 543 Fee income and commissions 5 48 26,249 57,180 - Leases - - 321 301 - Other income 4 59 236,871 6,391 - Expenses Financial expenses 243 1,197 129,335 30,431 6 Fee expenses and commissions 4 1,510 24,039 3,276 1 Operating expenses - 9,706 3,572 1,892 113 Other expenses - 1,635 32,691 34,400 - Individuals Entity December 31, 2016 Mr. Key Associates Entities Entities Income Interest income Ps. 28 321 81,646 64,299 789 Fee income and commissions 4 28 12,717 33,659 - Leases - - 66 290 30 Other income 440 - 171,405 2,957 9.915 Expenses Financial expenses 84 656 88,800 19,064 - Fee expenses and commissions 333 931 15,451 2,674 143 Operating expenses - 5,588 75 2,060 1 Other expenses 11 1,390 193,762 15,159 811 Individuals Entity December 31, 2015 Mr. Key Associates Entities Entities Income Interest income Ps. 84 379 66,562 23,506 1,122 Fee income and commissions 3 28 6,471 26,775 - Leases - - 278 262 19 Other income 2 80 190,571 2,423 5,786 Expenses Financial expenses 163 209 324 18,001 - Fee expenses and commissions 2 1,327 13,597 1,227 8 Operating expenses - 8,288 114 1,963 - Other expenses 5 154 71,759 27,916 60 Outstanding amounts are not guaranteed and shall be liquidated in cash. Guarantees have not been granted or received. No expense has been recognized during the current period nor in previous periods with respect to uncollectable or accounts of doubtful collection relating to amounts in debt by related parties. b. Compensation of Key Management Personnel The compensation received by the key personnel of the management comprises the following: Years ended as of Items December December December Salaries Ps. 17,073 Ps. 15,731 Ps. 14,271 Short term benefits for employees 3,167 10,664 12,282 Total Ps. 20,240 Ps. 26,395 Ps. 26,553 Transactions with our related parties correspond primarily to normal course of banking business activities effected in market conditions. Such transactions include demand and saving deposits, time deposits, commercial, consumer and mortgage loans, financial leases, payment of dividends and or interest.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2017
Events after reporting period [Abstract]
Disclosure of events after reporting period [text block]	NOTE 36 – SUBSEQUENT EVENTS On January 15, 2018, there was a partial collapse of the Chirajara bridge located on KM64 Bogotá - Villavicencio, which is under construction, whose causes are still unknown and are the subject of investigation. This infrastructure is part of the concession contract No. 444 of 1994, in which Concesionaria Vial de los Andes S.A ("Coviandes") is the company awarded the contract and, therefore, is the Constructora de Infraestructura Vial S.A.S ("Coninvial") through contract 444-12310 of November 5, 2010, is the construction contractor of the work, of which, the construction of the bridge is part. At the same time, Coninvial advanced the construction of the Chirajara bridge through a design and construction contract with the subcontractor Gisaico S.A. Corficolombiana S.A. subsidiary of Grupo Aval, is direct and indirect owner (through Estudios, Proyectos e Inversiones de Los Andes S.A.S) of 59.77% of Coviandes. In addition, Estudios y Proyectos del Sol S.A.S ("Episol"), a company 100% owned by Corficolombiana S.A., owns 60.00% of the share capital of Coninvial. Coviandes hired the services of Modjeski &; Masters, a renowned American consultant expert in forensic studies of cable-stayed bridges, to determine the causes of the event. Once the results of the investigation are known, the implications and costs related to the incident can be determined. At the General Meeting of Shareholders that took place on March 23, 2018, it was declared a dividend of Ps. 4.00 per month for the preferred and common shares, during period of twelve-month between April, 2018 and March 2019, for a total dividend of Ps. 1,069,489 according to the following: Net income for period ended December 31, 2017 included in the unconsolidated financial statements of Grupo Aval 2,001,178 Occasional reserve release at the disposal of the General Meeting of Shareholders 5,333,761 Total Income available for disposal of the General Meeting of Shareholders 7,334,939 Cash Dividends Ps. 48 per share payable in twelve monthly installments of Ps.4.00 per share, from April, 2018 to March, 2019. Common shares outstanding 15,170,666,914 Preferred shares outstanding 7,110,350,245 Total shares outstanding 22,281,017,159 Total dividends declared Ps. 1,069,489 To Occasional reserve at the disposal of General Meeting of Shareholders 6,265,450 In a meeting held on March 23 2018, Grupo Aval’s Board of Directors approved the presentation of the consolidated financial statements under Colombian IFRS and the accompanying notes for the period ended December 31, 2017, for consideration of the General Meeting of Shareholders.

PARENT COMPANY INFORMATION

PARENT COMPANY INFORMATION	12 Months Ended
	Dec. 31, 2017
Disclosure Of parent company information [Abstract]
Disclosure of information about parent company [Text Block]	NOTE 37 – PARENT COMPANY INFORMATION Condensed Unconsolidated Statement of financial position Following are the condensed separate statements of financial position of Grupo Aval Acciones y Valores S.A., at December 31, 2017, and 2016 and condensed separate statements of income and statement of cash flows for the fiscal year ended December 31, 2017, 2016 and 2015. Condensed separate Statement of Financial Position December 31, 2017 2016 Current Assets Cash and cash equivalents Ps. 35,478 Ps. 47,280 Held for trading securities 453 4,980 Accounts receivable from related parties 274,323 260,445 Other assets 513 17,759 Total current assets Ps. 310,767 Ps. 330,464 Non current Assets Investments in subsidiaries 18,589,623 17,529,893 Property plant and equipment 2,851 3,170 Total non current assets Ps. 18,592,474 Ps. 17,533,063 Total assets Ps. 18,903,241 Ps. 17,863,527 Current liabilities Borrowings at amortized cost 290,101 370,349 Outstanding bonds at amortized cost 5,725 6,701 Accounts payable 440,318 430,279 Other non-financial liabilities 1,233 1,234 Total current liabilities Ps. 737,377 Ps. 808,563 Long-term liabilities Borrowings at amortized cost 253,503 365,605 Outstanding bonds 1,104,080 704,080 Deferred tax liabilities 33 - Total non current liabilities Ps. 1,357,616 Ps. 1,069,685 Total liabilities Ps. 2,094,993 Ps. 1,878,248 Equity Shareholders’ equity 16,808,248 15,985,279 Total liabilities and shareholders’ equity Ps. 18,903,241 Ps. 17,863,527 Condensed separate Statement of Income December 31, December 31, December 31, Operating revenue Equity method income, net 2,005,155 2,330,814 2,331,965 Other revenue from ordinary activities 234,502 77,387 75,262 Total operating revenue Ps. 2,239,657 Ps. 2,408,201 Ps. 2,407,227 Expenses, net Administrative expenses 89,823 98,130 79,908 Other expenses 274 168 337 Gains (losses) from exchange differences 98 (1,085 ) (29,760 ) Operating income Ps. 2,149,658 Ps. 2,308,818 Ps. 2,297,222 Financial expenses 133,171 125,585 68,512 Net income before taxes 2,016,487 2,183,233 2,228,710 Income tax expense 51,568 5,620 6,571 Net income Ps. 1,964,919 Ps. 2,177,613 Ps. 2,222,139 Condensed separate Cash flow December 31, December 31, December Net income Ps. 1,964,919 Ps. 2,177,613 Ps. 2,222,139 Adjustments to reconcile net income to net cash used by operating activities (867,042 ) (1,726,296 ) (1,470,593 ) Net cash provided by operating activities 1,097,877 451,317 751,546 Net cash provided (used in) by investing activities (8,830 ) (55,374 ) 192,801 Net cash (used in) provided by financing activities (1,100,849 ) (360,827 ) (974,642 ) Increase (decrease) in cash and cash equivalents (11,802 ) 35,116 (30,295 ) Cash and cash equivalents at beginning of year 47,280 12,164 42,459 Cash and cash equivalents at end of year Ps. 35,478 Ps. 47,280 Ps. 12,164 Basis for presenting and summary of significant accounting policies The attached separated financial statement of Grupo Aval have been prepared in accordance with the International Financial Reporting Standards (IFRS) issued by the International Accounting Standards Board (IASB), and their interpretations from the International Financial Reporting Standards Committee (IFRIC), currently in force and on the basis of historic cost, except for financial assets at fair value through profit or losses. Certain information and footnote disclosures normally included in financial statements prepared in accordance with IFRS have been condensed or omitted. The separated financial statements of Grupo Aval have been prepared using the same IFRS basis and principles that Grupo Aval used to prepare it consolidated financial statements described in Note 2, except as provided below for its investments in subsidiaries. Commitments and contingencies In the normal course of business, certain subsidiaries of Grupo Aval are defendants in various tax and legal proceedings. Grupo Aval is not aware of any pending legal proceedings which could have a significant effect on its financial position or the results of its operations. Investment in subsidiaries companies Based on the IAS 27, when an entity prepares separate financial statements it shall account for investments in subsidiaries either: a) at cost or b) at fair value, in accordance with IAS 39 or c) using the equity method. Accordingly Grupo Aval accounts its investments in subsidiaries using the equity method. The equity method is an accounting method according to which the investment is initially recorded at cost, and they are periodically adjusted due to changes in the interest of the parent company over the net assets of the subsidiaries. Grupo Aval records on the result of the period its participation in the profit or loss of the subsidiaries, and in OCI its participation in the “Other comprehensive income account” of the subsidiary. In applying equity method Grupo Aval uses the subsidiaries consolidated financial statements at the end of the period prepared under IFRS. Gain and losses resulting from transactions between Grupo Aval and its subsidiaries are recognized in the Gupo Aval´s financial statement only to the extent of Grupo Aval interest in the subsidiaries, unless the transaction provides evidence of an impairment in the book value of transferred assets. Additionally, in a business combination process, to acquire some subsidiaries any difference between the cost of investment and Grupo Aval’s share on the net fair value of the subsidiary identifiable acquired assets and assumed liabilities is accounted as follows: Goodwill relating to the acquisition is included in the carrying amount of the investment. Bonds at Amortization of goodwill is not permitted. Appropriate adjustment to Grupo Aval share of the subsidiary after acquisition are made to account for example for depreciation of assets acquired in the business combination process based on their fair value at the acquisition date and for the impairment losses in such assets. Investment in Subsidiaries Investment in subsidiaries as of December 31, 2017 and 2016 comprise the following: December 31, 2017 December 31, 2016 Subsidiary Economic Book Economic Book Banco de Bogotá S.A. 68.74 % Ps. 11,000,669 68.74 % Ps. 10,331,548 Banco de Occidente S.A. 72.27 % 3,174,228 72.27 % 3,089,717 Banco Comercial AV Villas S.A. 79.87 % 1,190,740 79.87 % 1,139,881 Banco Popular S.A. 93.74 % 2,710,218 93.74 % 2,624,196 Corporación Financiera Colombiana S.A. 44.79 % 504,962 44.49 % 472,466 Sociedad Administradora de Fondos de Pensiones y Cesantías Porvenir S.A. 75.69 % 401,341 75.69 % 341,112 Grupo Aval Limited 100.00 % (315,227 ) 100.00 % (316,553 ) Grupo Aval International Limited 100.00 % (77,308 ) 100.00 % (152,474 ) Ps. 18,589,623 Ps. 17,529,893 a) Outstanding bonds Bonds at December 31, 2017 and 2016 comprise the following: Amounts outstanding Issuance date Tranches Maturity Coupon rate 2017 2016 June, 2017 Ps. 100,000 June, 2020 IPC + 2.69% Ps. 100,000 Ps. - June, 2017 300,000 June, 2042 IPC + 3.99% 300,000 - November, 2016 93,000 November, 2026 IPC + 3.86% 93,000 93,000 November, 2016 207,000 November, 2036 IPC + 4.15% 207,000 207,000 December, 2009 279,560 December, 2019 IPC + 4.84% 279,560 279,560 December, 2009 124,520 December, 2024 IPC + 5.20% 124,520 124,520 Total Bonds Ps. 1,104,080 Ps. 1,104,080 Ps. 704,080 The scheduled maturities of bonds as of December 31, 2017 are as follows Period Amount 2019 279,560 2020 and thereafter 824,520 Total Ps. 1,104,080

BASIS OF PREPARATION OF THE C44

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2017
Disclosure of voluntary change in accounting policy [abstract]
Disclosure of basis of consolidation [text block]	2.1 Basis of preparation a) Presentation of Consolidated Financial Statements The consolidated financial statements are prepared as follows: · The consolidated statement of financial position presents assets and liabilities based on liquidity since it provides reliable and more relevant information, than separate current and non-current classifications. · The consolidated statements of income and other comprehensive income are presented separately. The statement of income is presented by nature, as it provides reliable and more relevant information. · The consolidated statements of cash flows are presented using the indirect method, accordingly, net cash flows from operating activities are determined by reconciling profit before taxes, due to the effects of the non-cash items, net changes in assets and liabilities from operating activities, and for any other effects that are not classified as investing or financing activities. Revenue and expenses due to interest received and paid are part of operating activities. b) Consolidated financial statements Grupo Aval prepares its consolidated financial statements with controlled entities. Grupo Aval controls an investee if it is exposed to, or has rights to, variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Grupo Aval reassesses whether it has control if there are changes to one or more of the elements of control. The financial statements of subsidiaries are consolidated in the financial statements of Grupo Aval since the date Grupo Aval acquires control until the date control is lost. During the consolidation process, Grupo Aval combines the assets, liabilities and profits or losses of those entities under control, previously aligning the accounting policies in all the subsidiaries. Such process includes eliminating intragroup balances and transactions and any unrealized and realized income and expense (except for foreign currency translation gains or losses) arising from intra-group transactions. Unrealized and realized losses are eliminated in the same way as unrealized and realized gains but only to the extent that there is no evidence of impairment. Non-controlling interest is presented in the consolidated statement of financial position of Grupo Aval separate from that attributable to equity holders of Grupo Aval. For consolidation purposes, the statements of financial position and income of Grupo Aval´s foreign subsidiaries are translated to Colombian pesos, as follows: · Assets and liabilities are translated at the closing exchange rate at the reporting date; · Income and expense of foreign operations are translated at monthly average exchange rates since those averages approximate the exchange rates of each specific transaction; · All resulting exchange differences are recognized in other comprehensive income and accumulated in the foreign currency translation reserve except to the extent that the translation difference is allocated to non-controlling interests. c) Investments in associates Associates are companies in which Grupo Aval has significant influence but not control. Investments in associates are accounted for under the equity method. They are presented in the statement of financial position as ”Investments in associates and joint ventures” (additionally see Note 2.1.d) “Joint arrangements”). Grupo Aval exercises significant influence over another entity if it owns, directly or indirectly, 20% or more of the voting power of the investee, unless it is clearly evidenced that such influence does not exist. Under the equity method, investments in associates are initially recognized at cost and subsequently adjusted by Grupo Aval´s share in the associates income and other comprehensive income with credit or charge to Grupo Aval’s profit or loss account and other comprehensive income, respectively of the net income, and other comprehensive income of the investee. Dividends received or receivable from associates and joint ventures are recognized as a reduction in the carrying amount of the investment. When the group’s share of losses in an equity-accounted investment equals or exceeds its interest in the entity, including any other unsecured long-term receivables, Grupo Aval does not recognize further losses, unless it has incurred obligations or made payments on behalf of the other entity. Unrealized gains on transactions between Grupo Aval and its associates are eliminated to the extent of Grupo Aval’s interest in these entities. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the asset transferred. Accounting policies of equity accounted investees have been changed where necessary to ensure consistency with the policies adopted by Grupo Aval. The carrying amount of equity-accounted investments is tested for impairment d) Joint arrangements A joint arrangement is one in which two or more parties have joint control of the arrangement. Joint arrangements are divided into joint operations, in which the parties having joint control of the agreement have rights to the assets and obligations with respect to the liabilities relating to the agreement, and joint ventures, wherein the parties having joint control are entitled to the net assets of the agreement. Grupo Aval recognizes joint operations in the consolidated financial statements based on their proportional and contractual participation in each of the assets, liabilities and profit or loss of the contract or entity wherein the agreement is held. In addition, Grupo Aval recognizes joint ventures by the equity method, in the same manner as investments in associates.
Description of accounting policy for functional currency [text block]	2.2 Grupo Aval functional currency Grupo Aval´s management has determined the Colombian Peso as the functional and presentation currency for preparing the consolidated financial statements. The foreign subsidiaries have other functional currencies, mainly the U.S. dollar.
Description of accounting policy for foreign currency transaction [Text Block]	2.3 Transactions in foreign currencies Foreign currency transactions are translated into the functional currency of Grupo Aval entities at the prevailing exchange rate at the date of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated into the functional currency using the prevailing exchange rate at the reporting date. Non-monetary assets and liabilities denominated in foreign currencies in terms of historical costs are measured using the exchange rate at the transaction date. Financial instruments measured at fair value are translated using the exchange rate from the date the fair value was determined. Profit or loss resulting from the translation process are recognized in profit or loss. At December 31, 2017, and 2016, the representative market rates as computed and certified by the Superintendency of Finance(for the U.S.$ which is the most representative foreign currency for Grupo Aval´s transactions) were Ps. 2,984.00 and Ps. 3,000.71 per U.S. $1, respectively.
Description of accounting policy for foreign currency translation [text block]	2.4 Convenience translation in to U.S. dollars The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
Description of accounting policy for restricted cash and cash equivalents [text block]	2.5 Cash and cash equivalents Cash and cash equivalents include cash, bank deposits, and other short-term investments with original maturities of three months or less from the date of their acquisition that are subject to an insignificant risk of changes in their fair value and are used by Grupo Aval in the management of its short-term commitments.
Description of accounting policy for financial assets [text block]	2.6 Financial assets a) Definition A financial asset is an asset that is: · Cash. · An equity instrument of another entity. · A contractual right to receive cash or another financial asset from another entity or to exchange financial assets or financial liabilities with another entity under conditions that are potentially favorable to the entity, or · A contract that will or may be settled in the entity´s own equity instruments and is a non-derivative. b) Classification For accounting purposes, financial assets are classified at initial recognition into four categories: · Fair value through profit or loss: (i) Held for trading financial assets acquired to generate short term profits or that is part of a portfolio of financial instruments managed together for that purpose. (ii) Some financial assets under concessions contracts are included in this category in order to obtain more relevant information, either because this eliminates or significantly reduces recognition or measurement inconsistencies (accounting mismatches) that would otherwise arise from measuring assets or recognizing the gains or losses on them on different bases, in accordance with a documented risk management or investment strategy, and information is provided on that basis to Grupo Aval’s key management personnel. This classification adequately reflects the present market expectations over future costs comprising the amount of the concession to be negotiated with the different Colombian Government, upon the termination of the concession or its renewal. · Held-to-maturity Investments: These are debt securities with fixed or determinable payments and a fixed maturity date, which Grupo Aval intends and has the ability to hold to maturity. · Loans and receivables: These are financial assets of fixed or determinable payments that are not quoted in active markets and are not classified as either trading or available-for-sale. · Available-for-sale: These are financial assets that are designated initially as available-for-sale and are those not classified as loans and receivables, or as held-to-maturity investments. c) Initial measurement Grupo Aval initially recognizes loans and receivables, on the date on which they are originated. All other financial instruments (including regular-way purchases and sales of financial assets) are recognized on the trade date, which is the date on which Grupo Aval becomes a party to the contractual provisions of the instrument. Financial assets not measured at fair value through profit or loss are initially measured at fair value plus any directly attributable transaction costs. d) Subsequent measurement Subsequent to initial recognition, financial assets are measured as follows: · At fair value through profit or loss: are measured daily at their fair value with changes recognized in profit or loss. · Loans and receivables and held-to-maturity investments: are measured at their amortized cost, calculated based on the effective interest rate method, less any impairment. The effective interest rate method is a method of calculating the amortized cost of a financial asset and allocating the interest income or expense over the relevant period. The effective interest rate is the rate that discounts future cash payments or receipts (without consideration of future credit losses, over the expected life of the financial instrument) to the net carrying amount of the financial asset at initial recognition. In the process of calculating the effective interest rate, Grupo Aval estimates the cash flows considering the contractual terms including prepayment expectations of the financial instrument for portfolios with high prepayment levels, except for future credit losses and considering the initial fair value plus transaction costs and premiums granted, minus commissions and discounts received which form integral part of the effective rate. · Available-for-sale: - Debt instruments are initially recognized at fair value. The effective interest rate method is used in order to calculate the amortized cost of the instrument to determine interest income that is recognized in profit or loss. Any changes in fair value are recognized in Other Comprehensive Income (OCI). Impairment losses and foreign exchange gains and losses on available-for-sale debt instruments are excluded from the fair value gains and losses recognized in other comprehensive income and are recognized in profit or loss as incurred. - Available-for-sale equity instruments are recognized at fair value, with gains or losses recognized in other comprehensive income. Dividends received from such instruments are recognized in profit or loss when Grupo Aval becomes entitled to receive the payment and impairment losses are recognized in profit or loss. - When available-for-sale financial assets are sold, the accumulated values in other comprehensive income are reclassified to profit or loss. e) Reclassifications Subsequent to their initial classification, financial assets shall not be reclassified to other categories, except for special circumstances. In the event of such circumstances, transfers shall be accounted for as follows: · From the category “fair value through profit or loss” to other categories: assets are recognized at their fair value. · From available-for-sale to held-to-maturity investment: the fair value amount recognized immediately before the reclassification to held-to-maturity category becomes the basis for the amortized cost. In reclassification of an asset with a fixed maturity, any gain or loss previously recognized in other comprehensive income (OCI) and the difference between the newly established amortized cost and the maturity amount are both amortized over the remaining term of the financial asset using the effective interest rate method. However, any gain or loss previously recognized in other comprehensive income is immediately reclassified from equity to profit or loss if the asset is subsequently impaired. For a financial asset with no stated maturity, any gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss when the financial asset is disposed of or impaired. · From held-to-maturity investment to available-for-sale: the difference between the amortized cost and fair value as of the reclassification date is recognized in other comprehensive income. f) Fair value of financial assets Fair value is the price to be received from the sale of an asset or paid for transferring a liability in an orderly transaction between market participants at the measurement date. Fair value of financial assets is determined as follows: · When available, Grupo Aval measures the fair value of an instrument using the quoted price in an active market for that instrument. A market is regarded as active if transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis. · If there is no quoted price in an active market, then Grupo Aval uses valuation techniques that maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The chosen valuation technique incorporates all of the factors that market participants would take into account in pricing a transaction. See Note 5). g) Impairment of financial assets Grupo Aval assesses whether there is objective evidence that a financial asset or a group of financial assets is impaired depending on its classification. For financial assets measured at amortized cost, objective evidence includes: significant financial difficulties of the borrower, default or delinquency by a borrower, restructuring of a loan or advance on terms that Grupo Aval would not consider otherwise, indications that a borrower or issuer will enter bankruptcy, disappearance of an active market for a security or observable data relating to a group of assets such as adverse changes in the payment status of borrowers or issuers in Grupo Aval, or economic conditions that correlate with defaults. If there is objective evidence of impairment, impairment is recognized in profit or loss. The amount of the allowance is determined as follows: · Grupo Aval performs an individual assessment of significant financial assets classified as held until maturity and loans and receivables, analyzing the debt profile of each debtor, the guarantees granted and information provided by credit risk agencies. Financial assets are deemed impaired when based on information and current and past events it is likely that Grupo Aval may not collect all the amounts due in the original contract, including interest and fees. If a financial asset has been identified as impaired, the amount of the loss is measured as the difference between the carrying amount of the financial asset and the present value of the future cash flows expected pursuant to the debtor’s conditions, discounted at the original effective interest rate, or the present value of the collateral guarantee covering the asset, less the estimated costs of sale when it is determined that the most important source of collection of the loan is such guarantee. · For those financial assets which are not deemed individually as significant and for individually significant financial asset portfolios which were not determined as impaired after the individual assessment described above, Grupo Aval carries out a collective assessment of impairment. For this purpose, financial assets are grouped together into segments with similar characteristics, using statistical assessment techniques based on an analysis of historical losses to determine an estimated percentage of losses which could have been incurred in such assets as of the date of the reporting, but that have not been identified on an individual basis (See Note 4 for further details regarding the calculation of the collective allowance). · Once an allowance is recorded for a financial asset or a group of similar financial assets, due to an impairment loss, interest income of the loan continues to be recognized using the same effective interest rate applied to the carrying value of the loan. Impaired financial assets are charged off from the consolidated statement of financial position when the recovery of any recognized amount is considered to be unlikely. Collections charged-off of financial assets are recognized in profit or loss. For available-for-sale debt securities, Grupo Aval assesses objective evidence for impairment following the same criteria used for loans and receivables, which could include: · significant financial difficulty of the issuer or counterparty; or · breach of contract, such as a default or delinquency in interest or principal payments; or · indication that a borrower or issuer will enter bankruptcy or reorganization; or · the disappearance of an active market for that financial asset because of financial difficulties. For available-for-sale equity instruments, a significant or prolonged decline in the fair value of the security below its cost is considered to be an objective evidence of impairment. When there is objective evidence at the measurement date that excesses of carrying value over fair value are due to an impairment that is other than temporary, cumulative gains or losses previously recognized in equity under “Other Comprehensive Income” are reclassified to profit or loss. In respect of available-for-sale debt instruments, impairment losses are subsequently reversed through profit or loss if an increase in the fair value of the investment can be objectively related to an event occurring after the recognition of the impairment loss. For available-for-sale equity instruments impairment losses previously recognized in profit or loss are not reversed through profit or loss. Any increase in fair value subsequent to an impairment loss is recognized in equity under “Other Comprehensive Income”. Once the impairment losses have been estimated, they are charged to profit or loss of the period and credited to an allowance sub-account in the respective financial asset category. h) Troubled debt restructured loans Troubled debt restructured loans are those that have collection problems in which Grupo Aval grants the debtor a modification that it would not otherwise consider. These modifications generally involve interest rate reductions, extension of deadlines for payment or reductions in the balance due to a troubled debt loan. If the terms of a financial asset are renegotiated or modified or an existing financial asset is replaced with a new one due to financial difficulties of the borrower, then an assessment is made of whether the financial asset should be derecognized. If the cash flows of the renegotiated asset are substantially different, then the contractual rights to cash flows from the original financial asset are deemed to have expired. In this case, the original financial asset is derecognized and the new financial asset is recognized at fair value. The impairment loss before an expected restructuring is measured as follows. · If the expected restructuring will not result in derecognition of the existing asset, then the estimated cash flows arising from the modified financial asset are included in the measurement of the existing asset, and based on their expected timing and amounts are discounted at the original effective interest rate of the existing financial asset. · If the expected restructuring will result in derecognition of the existing asset, then the expected fair value of the new asset is treated as the final cash flow from the existing financial asset at the time of its derecognition. This amount is discounted from the expected date of derecognition to the reporting date using the original effective interest rate of the existing financial asset. i) Transfers of financial assets The accounting treatment of transfers of financial assets is conditioned by the transfer of risks and rewards, associated with the asset. Those financial assets are only derecognized when the cash flows generated by the asset have been transferred or when the implicit risks and rewards have been substantially transferred to third parties. In this case, the transferred financial asset is derecognized from the consolidated statement of financial position, simultaneously recognizing any right or obligation retained or recording a profit or loss on the transfer (see note 34). If the risks and/or rewards associated with the financial asset transferred are substantially retained: · The transferred financial asset is not derecognized and continues to be valued using the same criteria applied before the transfer ; · A financial liability is recognized in an amount that equals the compensation received, which is subsequently valued at amortized cost; and · Both the income associated with the transferred financial assets (but not derecognized) as well as the expenses associated with the new financial liability will continue to be recognized in the consolidated financial statements of Grupo Aval. j) Offsetting of financial instruments in the consolidated statement of financial position Financial assets and liabilities are offset, and the net amount is recognized in the consolidated statement of financial position, when there is a legally enforceable right to offset recognized amounts and management intends to settle them on a net basis or to realize the asset and settle the liability simultaneously. k) Repurchase agreements and reverse repurchase agreements Purchases of financial instruments under a non-optional resale agreement are measured at fair value and recognized as assets in the consolidated statement of financial position under loans and receivables to credit institutions – Reverse repurchase agreements or loans and receivables to customers – Reverse repurchase agreements (see note 34). The excess of the purchase prices over the resale prices is recognized as interest income over the contractual term. Sales of financial instruments under a non-optional repurchase agreement are measured at fair value and recognized as liabilities in the consolidated statement of financial position under Deposits from the Central Bank – Repurchase agreements, Deposits from credit institutions – Repurchase agreements or Customer deposits – Repurchase agreements (see note 34). The excess of the sales prices over the repurchase prices is recognized as interest expense over the contractual term.
Description of accounting policy for derecognition of financial instruments [text block]	2.7 Derecognition of financial assets Financial assets are derecognized from the consolidated statement of financial position only when all the risks and rewards of the asset have been substantially transferred to third parties or when the rights have been legally extinguished.
Description of accounting policy for derivative financial instruments and hedging [text block]	2.8 Derivative financial instruments and hedging accounting A derivative is a financial instrument whose value changes in response to changes in one or more variables denominated as an “underlying” (a specific interest rate, the price of a financial instrument, a listed commodity, a foreign currency exchange rate, etc.), that has an initial net investment smaller than would be required for other instruments that have a similar response to the mentioned variable and that is settled in a future date. Grupo Aval trades in financial markets, forward contracts, future contracts, swaps and options that fulfil the definition of a derivative. Derivative transactions are initially recognized at fair value. Subsequent changes in the fair value are recognized in profit or loss, unless the derivative instrument is designated as a hedging instrument and, in this case, the accounting criteria will depend on the nature of the hedged item, as described below: · For fair value hedge of assets or liabilities and firm commitments, changes in the fair value of the derivative instrument are recognized in profit or loss, as well as any other change in the fair value of the asset, liability or firm commitment attributable to the hedge risk. · For cash flow hedge of a particular risk associated with a recognized asset or liability or a projected highly probable transaction, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income. The gain or loss relating to the portion that is not effective for hedging or that does not relate to the hedged risk is immediately recognized in profit or loss. The values accumulated in other comprehensive income are transferred to profit or loss in the same period in which the hedged item is recognized in profit or loss. · Hedging of net investments in a foreign operation is recognized similarly to cash flow hedging: the effective portion of changes in fair value of the hedging instrument is recognized in other comprehensive income, and the ineffective portion of the changes in fair value of the derivative is recognized in profit or loss. The hedging instrument's gains or losses accumulated in equity will be recognized in profit or loss when the net investment in foreign operations is sold in whole or proportionally, if partially disposed of. At the beginning of the hedging transaction, Grupo Aval formally documents the relationship existing between the hedging instrument and the hedged item, including the risk management objective and strategy in undertaking the hedging relationship. It also documents its assessment, both initially as well as on a recurring basis, of whether the hedging relationship is highly effective in offsetting the changes in fair value or cash flows of the hedged items. Financial assets and liabilities from transactions with derivatives are not offset in the consolidated statement of financial position. However, when there is a legal and exercisable right to offset the recognized values and Grupo Aval intends to be settle them on a net basis or to realize the assets and settle the liability simultaneously, derivatives are presented as net values in the consolidated statement of financial position.
Description of accounting policy for non-current assets or disposal groups classified as held for sale and discontinued operations [text block]	2.9 Non-current assets held for sale Foreclosed assets and non-current assets held for sale, which Grupo Aval intends to sell in a period of less than one year, and it is considered highly probable that their value will be recovered primarily through sale rather than through continuing use, are recognized as "non-current assets held for sale". These assets are measured at the lower of their carrying value at the time of transfer and fair value, less estimated disposal costs.
DescriptionOfAccountingPolicyForFinancialGuaranteesExplanatory [text block]	2.10 Financial guarantees Financial guarantees are those contracts requiring that the issuer carries out specific payments to reimburse the creditor for losses incurred when a specific debtor defaults its payment obligation, in accordance with the original or modified conditions, of a debt instrument; regardless of its legal form. Liabilities arising from financial guarantees are initially measured at fair value, which is generally the value of the fee received, adjusted for the directly attributable transaction costs incurred, and the initial fair value is amortized over the life of the guarantee or the commitment. The liability is subsequently carried at the higher of this amortized amount and the present value of any expected payment to settle the liability when a payment under the contract has become probable. The financial guarantees are periodically reviewed with the purpose of determining the credit risk exposure, and, as the case may be, estimate the need to recognize a provision, which is determined by applying criteria similar to those established to quantify the losses for financial assets impairment. The provisions established over financial guarantee agreements classified as impaired, are recognized as liabilities under “Provisions – other provisions” and recognized in profit or loss.
Description of accounting policy for property, plant and equipment [text block]	2.11 Property, plant and equipment for own use Property, plant and equipment include the assets, owned or under financial leases held by Grupo Aval for current or future use and which expects to be used for more than one period. They are recognized in the consolidated statement of financial position at their acquisition or construction cost, less the corresponding accumulated depreciation and, if applicable, the estimated impairment losses resulting from comparing the carrying amount of each asset with its recoverable value. Depreciation is calculated by applying the straight-line method over the acquisition cost of the assets, less any residual value; land is not depreciated. Depreciation is estimated on a straight-line basis during the estimated useful life of the asset. The annual depreciation rates for each item of assets are: Asset Useful Life Own use buildings According to appraisals without exceeding 70 years Equipment, furniture and accessories From 3 to 10 years Machinery and equipment From 5 to 25 years Computer equipment From 3 to 12 years Vehicles From 5 to 10 years Bearer plants From 25 to 35 years Conservation and maintenance expense is recognized as incurred as “Administrative Expense”. According to the changes in accounting policies discussed in 2.15 below, the biological assets that meet the definition of bearer plants are accounted for as property, plant and equipment. A bearer plant is a live plant that meets the following requirements: a) It is used for the manufacturing or supply of agricultural products; b) It is expected to produce for more than one period; and c) It has a remote probability of being sold as an agricultural product, except for irregular sales related to thinning and trimming. Bearer plants that are under the set-up and growing phase are subject to a biological transformation which should be reflected through cost accumulation until they reach their maturity level. In the case of the African oil palm maturity is reached in the second year, while for rubber maturity is reached in the seventh year. After reaching their maturity bearer plants are considered developed and the future economic benefits arise from the sale of the fruit produced during the life of the plant. Bearer plants are measured at their cost less accumulated depreciation and any impairment losses. The useful life is equal to the plants´ production periods. The useful life of the rubber plant is 35 years while the useful life of the African oil palm is 25 years. The depreciation method used is the estimated production units as it accurately reflects the use of the assets. If the bearer plant is sold for timber at the end of the useful life the value received is considered the residual value of the asset.
Description of accounting policy for investment property [text block]	2.12 Investment properties Land and buildings, considered in whole or in part, that are held to earn rental income or for capital appreciation, rather than for own use or sale in the ordinary course of business. Investment properties are recognized initially at cost, including all costs associated with the transaction, and subsequently measured at fair value, with changes in fair value recognized in profit or loss.
Description of accounting policy for leases [text block]	2.13 Leases – Lessor accounting Leases are classified as a finance or operating lease. A lease is classified as a financial lease when it substantially transfers all the risks and rewards inherent to the property. A lease is classified as operating if it does not substantially transfer all the risks and rewards inherent to the property. Lease contracts classified as financial lease are included in the consolidated statement of financial position as “Loans and receivables” and are recognized in the same way as other loans, as explained in note 2.6 above. Lease contracts classified as operating lease continue to be classified as property, plant and equipment or investment property in Grupo Aval and are recognized and depreciated in the same manner as property and equipment of its own use. Revenues from payments are recognized in profit or loss of the period using the straight-line accrual method.
Description Of Accounting Policy For Lessee Explanatory [Text Block]	2.14 Leases - Lessee accounting Up on initial recognition, leases are classified as financial or operating leases, in the same way as described above. Lease agreements classified as finance leases are included in the consolidated statement of financial position as property, plant and equipment or as investment properties, in accordance with the intention of Grupo Aval in relation to the asset, and are initially recognized in assets and in liabilities simultaneously for an amount equal to the lesser of the fair value of the leased asset or the present value of the minimum lease payments. The present value of the minimum lease payments is established by using the implicit interest rate in the lease contract, or if such rate is not determinable, the average interest rate of the bonds placed by Grupo Aval in the market. Any initial direct cost of the lessee is added to the recognized asset amount. After initial recognition, these assets are accounted for in the same manner as other property, plant and equipment or investment properties. The value recognized as a liability is included as a financial liability. Payments under lease contracts classified as operating are recognized on a straight-line basis in profit or loss over the lease term. Incentives received from leasing are recognized as an integral part of the total lease payments during its term.
Description of accounting policy for biological assets [text block]	2.15 Biological assets Other biological assets, including biological assets growing in the bearer plants, are recognized both at the time of their initial recognition and at the end of reporting period at fair value less disposal cost, except for biological assets for which their fair value cannot be measured reliably; in such case they are measured at cost less accumulated depreciation and impairment loss. Gains and losses arising from the initial and subsequent recognition at fair value of the agricultural products are included in profit or loss. Costs incurred in the agricultural production process are also recognized directly in profit or loss. Fair value of biological assets is determined using valuations performed by experienced internal professionals, using discounted cash flow models. The expected cash flows of the crop’s total life are determined by using the market price of the agricultural product currently in effect and the estimated productive life of plants, net of maintenance and harvest costs and of any other costs required for plant maintenance during the production period. Productive life of plants is estimated considering the age, location and type of product. Fair value of the biological assets is dependent on current market prices for each product.
Description of accounting policy for business combinations and goodwill [text block]	2.16 Business combinations and goodwill Business combinations are accounted for by using the “acquisition method” when control is transferred to the controlling entity. The consideration transferred in the acquisition is generally measured at fair value, as are the identifiable net assets acquired. Any goodwill that arises is tested annually for impairment. If there are non-controlling interests during the acquisition of control of the entity, such non-controlling interests are recognized at either fair value or at the proportionate interest in the recognized amount of the identifiable net assets of the acquiree. This election is allowed on a transaction basis. Goodwill is measured as the excess of the aggregate of consideration transferred, over the amount of any interest previously acquired and the net of identifiable assets and liabilities assumed at acquisition date. Goodwill acquired in a business combination is assigned to each of the groups of cash-generating units from which a benefit is expected as a consequence of the acquisition. Goodwill is not subsequently amortized but is subject to an annual assessment of impairment of the cash-generating unit to which goodwill has been assigned, from which benefits are expected deriving from the synergies of business combinations. A loss due to impairment recognized on Goodwill cannot be reversed in subsequent periods. In addition, statement of income of the acquiree is included in Grupo Aval´s consolidated financial statements from the acquisition date.
Description of accounting policy for intangible assets other than goodwill [text block]	2.17 Other intangibles assets Other intangible assets mainly comprise software and licenses, which are initially measured at the cost of acquisition or cost of development. Costs incurred during the research phase are expensed as incurred. Development expenses which are directly attributable to design and performance tests of software and identifiable, unique and controlled by Grupo Aval are recognized as intangible assets, when the following conditions are met: · Technically, it is possible to complete the intangible asset production so it can be available for use; · Management intends to complete the corresponding intangible asset for use; · Grupo Aval has the capacity of using the intangible asset; · It is probable that future economic benefits that are attributable to the asset will flow to the entity; · There is availability of adequate technical or financial resources or other type, for completion and usage of the intangible asset; and · Costs attributable to intangible asset during its development phase can be estimated and measured in a reliable manner. Costs that are directly attributable and capitalized as part of intangible assets include personnel expense directly related to developing such programs and an adequate percent of overhead expense. Expenses that do not satisfy these criteria are recognized as incurred expenses. Disbursements over intangible assets are initially recognized as expenses of the period and they will not be subsequently recognized as intangible assets. Subsequent to their initial recognition, these assets are measured at cost less amortization, which is carried out during its estimated useful life as follows: software amortization is recognized on a straight-line basis, according to the estimated useful lives. At the end of each fiscal year, Grupo Aval analyzes if there is evidence based on each CGU, both external and internal, indicating that the intangible asset is impaired. Any loss due to subsequent impairment or reversals are recognized in profit or loss; such impairment is determined by the excess of carrying amount over recoverable value.
Description of accounting policy for service concession arrangements [text block]	2.18 Concession arrangements rights Concession contracts, between certain subsidiaries of Grupo Aval and the Colombian Government for the construction or maintenance of infrastructure during a specific period, in which those entities receive income during the life of the contract, whether through direct payments from the Government or through tolls or fees charged to the users, are recognized as financial assets or intangible assets. A financial asset is recognized when pursuant to the contractual conditions, the contractor is entitled to an unconditional contractual right of receiving from the grantor entity or from the Colombian Government, cash or other financial assets due to construction services or when the Government guarantees minimum income from tolls or fees charged to the users of the concession work during the term of the concession agreement. An intangible asset is recognized when the Grupo Aval subsidiary in the concession contract does not have an unconditional right to receive cash and it has a right to charge for the use of the concession infrastructure. In some cases, contracts can contain both financial and intangible assets. Concession arrangements are recognized as follows: (a) During the construction stage of assets under concession, all estimated income for construction and upgrade services and costs associated to construction are recognized in profit or loss based on the stage of completion of the work performed. Any additional expected loss is recognized as an expense. (b) If all or part the concession agreements is classified as a financial asset, it is recognized as loans and receivables in other accounts receivable line in the consolidated statement of financial position, initially at fair value and subsequently at amortized cost, with the exception of certain concession agreements in Promigas’ subsidiaries which due to the condition of the contracts, are classified as other financial assets at fair value through profit or loss. (c) If all or part the concession agreements is classified as an intangible asset, the considerations for providing construction or upgrade services are measured at fair value on initial recognition with reference to the fair value of the services provided. The fair value is the cost of the intangible assets which is subsequently amortized to profit or loss during the term of the contract. Any income received as tolls or fees before completion of the construction stage is deferred and amortized, to profit or loss during the term of the contract, starting on the date in which the asset is placed into use. Income received from tolls or fees upon construction completion and available for public service is recognized as income when effectively received.
Description of accounting policy for impairment of non-financial assets [text block]	2.19 Impairment of non-financial assets At each reporting date, Grupo Aval reviews the carrying amounts of its non-financial assets (other than investment properties and deferred tax assets) to determine whether there is any indication of impairment. If any such indication exists, then the asset’s recoverable amount is estimated. Goodwill is tested annually for impairment. For impairment testing, assets are grouped together into the smallest group of assets that generates cash inflows from continuing use that is largely independent of the cash inflows of other assets or Cash Generating Units (CGU). Goodwill arising from a business combination is allocated to CGUs or groups of CGUs that are expected to benefit from the synergies of the combination. The ‘recoverable amount’ of an asset or CGU is the greater of its value in use and its fair value less costs to sell. ‘Value in use’ is based on the estimated future cash flows, discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset or CGU. An impairment loss is recognized if the carrying amount of an asset or CGU exceeds its recoverable amount. Grupo Aval´s corporate assets do not generate separate cash inflows and are used by more than one CGU. Corporate assets are allocated to CGUs on a reasonable and consistent basis and tested for impairment as part of the testing of the CGUs to which the corporate assets are allocated. Impairment losses are recognized in profit or loss. They are allocated first to reduce the carrying amount of any goodwill allocated to the CGU, and then to reduce the carrying amounts of the other assets in the CGU on a pro rata basis. An impairment loss in respect of goodwill cannot be reversed. For other assets, an impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized.
Description of accounting policy for financial liabilities [text block]	2.20 Financial liabilities A financial liability is any contractual liability of Grupo Aval to deliver cash or other financial asset to another entity or person, or to exchange financial assets or financial liabilities under potentially unfavorable conditions for Grupo Aval, or a contract which will be terminated or could be settled using equity instruments owned by the entity. Financial liabilities are initially recognized based on their fair value, which is usually equal to the transaction value less directly attributable costs. Subsequently, such financial liabilities are measured at their amortized cost according to the effective interest rate method determined at initial recognition, and recognized in profit or loss.
Description of accounting policy for employee benefits [text block]	2.21 Employee Benefits Grupo Aval entities provide the following benefits to employees in exchange of services rendered to the Group: a) Short-term employee benefits Pursuant to Colombian labor rules, such benefits are comprised of salaries, legal and extra-legal premiums, holidays, severance payments and payroll tax contributions to the Colombian Government agencies which are paid within 12 months following the end of the period. Such benefits are recognized on an accrual basis and recognized in profit or loss. b) Post-employment benefits (defined benefit plans) These are benefits that Grupo Aval pays to its employees when they retire or upon completion of their employment period, other than indemnities. According to Colombian labor rules, such benefits are retirement pensions which are directly assumed by Grupo Aval's entities, pending severance payments to employees belonging to the labor regime prior to Law 50 1990 and certain extra-legal benefits or agreed in collective labor conventions. Post-employment benefits liabilities are determined based on present value of estimated future payments, calculated based on actuarial assessments based on the projected unit of credit method, and applying actuarial assumptions about mortality rate, increase of salaries and personnel turnover, and interest rates determined with reference to bond market returns of Colombian Government’ bonds or high-quality business liabilities in effect at the reporting date. Under the projected unit of credit method, future benefits to be paid to employees are assigned to each accounting period in which the employee renders the service. Therefore, the corresponding expense due to these benefits recognized in profit or loss of Grupo Aval includes the present service cost assigned in the actuarial calculation plus the financial cost of calculated liabilities. Changes in liabilities due to changes in actuarial assumptions are recognized in Other Comprehensive Income. Changes in actuarial liabilities due to changes in employment benefits granted to employees that have a retroactive effect are recognized as an expense in the earlier of the following dates: · When a modification of the granted employment benefits takes place, or · When provisions for restructuring costs are recognized by a subsidiary or a business of Grupo Aval. c) Other long-term employee benefits Long term benefits are different from employee short-term benefits, post-employment benefits and termination. In accordance with the collective conventions and regulations of each company of Grupo Aval, such benefits are mainly related to seniority bonuses. Long-term liabilities for employee benefits are determined in the same manner as post-employment benefits described in item (b) above; the only difference is that the changes in the actuarial liability due to changes in the actuarial assumptions are recognized in profit or loss. d) Termination benefits These benefits are payments carried out by Grupo Aval entities deriving from a unilateral decision of terminating a labor contract or by a decision of the employee to accept benefits offered by an entity in exchange for terminating the employment contract. Pursuant to Colombian law, such payments correspond to compensation and other benefits that entities unilaterally decide to grant to their employees under such circumstances. Termination benefits are recognized as a liability or in profit or loss at the earlier of the following dates: · When Grupo Aval formally informs to the employee about its decision of dismissal; or · When provisions for restructuring costs are recognized by a subsidiary or business of Grupo Aval.
Description of accounting policy for income tax [text block]	2.22 Income taxes Income tax expense includes both current and deferred tax. Tax expense is recognized in profit or loss except for items recognized in Other Comprehensive Income or directly in equity. The current income tax is calculated based on the tax laws in force (enacted or substantively enacted) in Colombia as of the reporting date of the consolidated financial statements or, in the country where subsidiaries of Grupo Aval are located and subject to tax payment. Management of each entity of Grupo Aval periodically assesses tax return positions with respect to situations where the applicable tax regulation is subject to interpretation and establishes provisions, when appropriate, on the basis of amounts expected to be paid to tax authorities. Deferred taxes are recognized in respect of temporary differences arising between carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for tax purposes. Deferred taxes are not recognized for: temporary differences on the initial recognition of goodwill; temporary differences on the initial recognition of an asset or liability in a transaction that is not business combination and that affects neither accounting or taxable profit or loss and temporary differences related to investments in subsidiaries to the extent that it is probable that they will not reverse in the foreseeable future. Deferred tax is measured using the tax rates that are expected to be applied to the temporary differences when they reverse, using tax rates enacted or substantively enacted at the reporting date. Deferred taxes assets are only recognized to the extent it is probable that future taxable income is expected to be available to offset temporary differences. Deferred tax liabilities arise from taxable temporary differences, except for the deferred tax liabilities on investments in subsidiaries, when the opportunity of reversal of temporary differences is controlled by Grupo Aval and it is not reversed in the near future. Generally, Grupo Aval has the ability to control the temporary differences of investments in associates. Current taxes are offset only when the entity has a legally enforceable right to offset and the entity intends either to settle on a net basis or to realize the asset and settle the liability simultaneously. Deferred taxes are offset when the entity has a legally enforceable right to offset current tax assets against current tax liabilities and when the deferred tax assets and liabilities are related to income taxes levied by the same tax authority over the same taxable entity or over different entities but these entities have an intention to settle current tax liabilities and assets on a net basis or their tax assets and liabilities will be realized simultaneously for each period in which these differences reverse. In determining the amount of current and deferred taxes, Grupo Aval considers the impact of uncertain tax exposures on current tax liabilities, including whether additional taxes and interest may be due. This assessment relies on estimates and assumptions and may involve a series of judgments about future events. New information may become available that causes Grupo Aval to change its judgment regarding the adequacy of existing tax liabilities; such changes to tax liabilities would impact tax expense in the period in which such a determination is made.
Description of accounting policy for taxes other than income tax [text block]	2.23 Non-Income taxes (levies) Levies are recognized as liabilities when Grupo Aval has accomplished the activities on which taxes must be paid, according to legislation in effect. A wealth tax was created by the Colombian Congress in late 2014, which is calculated based on the equity of companies in Colombia, determined under tax rules as of January 1, 2014, for every year from 2015 through 2017 on January 1, and is recognized on an annual basis as a liability when incurred and charged to profit or loss.
Description of accounting policy for provisions [text block]	2.24 Provisions Provisions for environmental dismantling and recovery, restructuring costs and legal claims are recognized when Grupo Aval has a present legal or constructive obligation as a result of past events, and it is probable that an outflow of economic benefits will be required to settle the obligation. Restructuring provisions include penalties due to cancelation of leases and employee dismissal payments. Provisions are measured at the present value of outflows expected to be necessary to settle the obligation, using a discount rate before taxes, reflecting the assessments of the time value of money of the current market as well as the specific risks of the obligation. The subsequent increase of the provision due to the unwinding of the discount rate is recognized as a financial expense.
Disclosure Of Accounting Policy For Nonvoting Rights Of Preferred Shares Explanatory [Text Block]	2.25 Non-voting rights of preferred shares Preferred shares represent partial ownership and do not provide with any of the voting rights of common shares. Holders of preferred shares receive a fixed dividend. Grupo Aval has classified as an equity instrument all the non-voting preferred shares. (see note 2.27)
Description of accounting policy for recognition of revenue [text block]	2.26 Revenues · Net interest income Interest income and expense are recognized in profit or loss using the effective interest rate method. The ‘effective interest rate’ is the rate that discounts the estimated future cash payments and receipts through the expected life of the financial asset or financial liability (or, where appropriate, a shorter period) to the carrying amount of the financial asset or financial liability. When calculating the effective interest rate, Grupo Aval estimates future cash flows considering all contractual terms of the financial instrument, but not future credit losses. The calculation of the effective interest rate includes transaction costs and fees and points paid or received that are an integral part of the effective interest rate. Transaction costs include incremental costs that are directly attributable to the acquisition or issue of a financial asset or financial liability. Interest income and expense presented in the statement of profit or loss: (i) interest on financial assets and financial liabilities measured at amortized cost calculated using the effective interest method; (ii) interest on available-for-sale debt securities calculated using the effective interest rate method; Interest income and expense on all trading assets and liabilities are considered to be incidental to Grupo Aval’s trading operations and are presented together with all other changes in the fair value of trading assets and liabilities in net trading income (Note 29). Fair value changes on other derivatives held for risk management purposes, and other financial assets and financial liabilities carried at fair value through profit or loss (FVTPL), are presented in net income from other financial instruments at FVTPL in the statement of profit or loss and OCI. · Net trading income ‘Net trading income’ comprises net gains or losses related to held for trading assets and liabilities, and includes all realized and unrealized fair value changes, interest, dividends and foreign exchange differences. · Revenue from commissions and fees Commissions and fees are recognized as revenue in profit or loss as follows: i. Commissions for banking services: when services are rendered; ii. The commissions on credit cards are booked and amortized on a straight line basis during the estimated useful life of the product and; iii. The commissions and fees accrued on the granting of new loans, net of incurred cost, are deferred and recognized in profit or loss during the life of the loans, net of incurred cost, using the effective interest method. · Revenue from services and sales of goods Revenues are measured at fair value of the consideration received or receivable, and represent amounts to be collected for the delivered goods or rendered services, net of discounts, returns, and the value added tax. Grupo Aval recognizes revenues when the amount can be measured in a reliable manner, when it is likely that future economic benefits will flow to the entity and when the specific criteria for each activity of the entities of Grupo Aval have been fulfilled a follows: · Rendering of services Grupo Aval renders services regarding several activities. Revenue from services is recognized in the period when the service is provided. The services are rendered, with reference to the completion stage of the specific transaction and assessed on the basis of the real service provided, as a proportion of all of the services that will be rendered. When the services are rendered through an undetermined number of acts, throughout a specific period of time, income is recognized on a straight line basis throughout the period. · Customer loyalty programs Financial entities and hotels of Grupo Aval manage several loyalty programs in which the customers accumulate points for their purchases, entitling them to redeem such points for prizes in accordance with the policies and the prize plan in force as of the redemption date. Reward points are recognized as an identifiable component separate from income for the service rendered, at their fair value. Income from loyalty programs is deferred and recognized in profit or loss when the entity has fulfilled its obligations to supply the products under the terms of the program or when it is no longer probable that the points under the program will be redeemed. Sale of goods Revenue from the sale of goods from the non-financial sector is recognized when the risks and returns and control of the products are transferred to the buyer.
Description of accounting policy for earnings per share [text block]	2.27 Earnings per share Earnings per share is calculated as net income for the period attributable to Grupo Aval's shareholders divided by the weighted average number of common and preferred shares outstanding during the period. Diluted earnings per share are determined the same way, on the basis of net income, but the weighted average number of shares outstanding is adjusted to account for the potential dilutive effect of stock options. Grupo Aval does not have financial instruments with potential dilutive effects. As a consequence, only basic earnings per share are disclosed in these financial statements.
Description of accounting policy for segment reporting [text block]	2.28 Operating segments An operating segment is a component of an entity which: a) Engages in business activities from which it can earn revenue and incur expenses (including revenue and expenses from transactions with other components of the same entity); b) Its operating profit or losses are regularly reviewed by the chief operating decision maker, who decides on the resources allocation to the segment and assesses its performance; and c) For which discrete financial information is available. Grupo Aval discloses information separately for each identified operating segment, meeting any of the following quantitative thresholds: a) The segment´s reported revenue from the ordinary activities, including revenue from external customers as well as revenue from intersegment transfers, is equal or greater than 10 per cent of the revenue of combined ordinary activities, internal and external, of all operating segments. b) The absolute amount of the segment´s reported net income is, in absolute terms, equal or greater than 10 per cent of the amount greater of: (i) the combined reported net income of all the segments not reporting a loss; and (ii) the reported combined loss of all segments of the operations with incurred losses. c) The segment´s assets are equal to or greater than 10 percent of the combined assets of all segments of the operation. The information regarding other activities of the business of operating segments that do not have to be reported is combined and disclosed within the category of “Others.”
Disclosure of expected impact of initial application of new standards or interpretations [text block]	2.29 New and Amended IFRS Below is a list of the new and amended standards that have been issued by the IASB and are effective for annual periods starting on or after January 1, 2018. Grupo Aval has not early adopted the new standards in preparing these consolidated financial statements. Management is in the process of assessing the potential impact of these pronouncements on Grupo Aval consolidated financial statements as further explained below: Forthcoming requirements IFRS 9 Financial Instruments and associated amendments to various other standards In July 2014, the IASB issued the final version of IFRS 9 Financial Instruments Financial Instruments: Recognition and Measurement In October 2017, the IASB issued Prepayment Features with Negative Compensation (Amendments to IFRS 9) Grupo Aval will apply IFRS 9 as issued in July 2014 initially on January 1, 2018 without early adopting the amendments to IFRS 9. Based on assessments performed to date, the total estimated effect (net of tax) due to the adoption of this standard on the opening balance of Grupo Aval’s total equity at January 1, 2018 is a reduction of approximately of Ps. 806,679, comprised of: – a reduction of approximately Ps. 1,212,968 related to new expected loss impairment requirements (see (ii)); – an increase of approximately Ps. 603 related to classification and measurement requirements, other than impairment (see (i) and (iii)); – an increase of approximately Ps. 65,123 related to IFRS 9 removes the cost exception for unquoted equity investments, requiring all equity investments to be measured at fair value (see (i); and – an increase of approximately Ps. 340,563 related to deferred tax effect. The above assessment is preliminary because not all transition work has been finalized. The estimated impact of adopting IFRS 9 on January 1, 2018 may change a consequence of: – IFRS 9 will require Grupo Aval to revise its accounting processes and internal controls and these changes ongoing; – although parallel exercises were carried out in the second half of 2017, the new systems and associated controls in place have not been operational for a more extended period; – Grupo Aval has not finalized the testing and assessment of controls over its new IT systems and changes to its governance framework; – Grupo Aval is refining and finalizing its models for Expected Credit Loss (ECL) calculations; and – the new accounting policies, assumptions, judgments and estimation techniques employed are subject to change until Grupo Aval finalizes its first financial statements that will include the date of initial application. i. Classification and Measurement of Financial Assets IFRS 9 contains a new classification and measurement approach for financial assets that reflects the business model in which assets are managed and their cash flow characteristics. IFRS 9 includes three principal classification categories for financial assets: measured at amortized cost, measured at fair value through other comprehensive income (FVOCI) and measured at fair value through profit or loss (FVTPL). It eliminates the existing IAS 39 categories of held to maturity, loans and receivables and available for sale. A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: – it is held within a business model which objective is to hold assets to collect contractual cash flows; and – its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest (SPPI) on the principal amount outstanding. A financial asset is measured at FVOCI only if it meets both of the following conditions and is not designated as at FVTPL: – it is held within a business model which objective is achieved by both collecting contractual cash flows and selling financial assets; and – its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. On initial recognition of an equity investment that is not held for trading, Grupo Aval may irrevocably elect to present subsequent changes in fair value in OCI. This election is made on an investment-by- investment basis. All financial assets not classified as measured at amortized cost or FVOCI as described above are measured at FVTPL. In addition, on initial recognition Grupo Aval may irrevocably designate a financial asset that otherwise would meet the requirements to be measured at amortized cost or at FVOCI as at FVTPL if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. A financial asset is classified into one of these categories on initial recognition. See (vii) for the transition requirements relating to classification of financial assets. Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of IFRS 9 are not separated. Instead, the hybrid financial instrument as a whole is assessed for classification. Business Model Assessment Grupo Aval assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects business is managed and information is provided to management. The information includes: – the stated policies and objectives for the portfolio and the operation of those policies in practice, including whether management’s strategy focuses on earning contractual interest revenue, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of the liabilities that are funding those assets or realizing cash flows through the sale of assets; – how the performance of the portfolio is evaluated and reported to Grupo Aval’s management; – the risks that affect the performance of the business model (and the financial assets held within that business model) and how those risks are managed; – how managers of the business are compensated – e.g. whether compensation is based on the fair value of the assets managed or the contractual cash flows collected; and – the frequency, volume and timing of sales in prior periods, the reasons for such sales and expectations about future sales activity. However, information about sales activity is not considered in isolation, but as part of an overall assessment of how Grupo Aval’s stated objective for managing the financial assets is achieved and how cash flows are realized. Financial assets that are held for trading and those that are managed and whose performance is evaluated on a fair value basis will be measured at FVTPL because they are neither held to collect contractual cash flows nor held both to collect contractual cash flows and to sell financial assets. Assessment Whether Contractual Cash Flows Are Solely Payments of Principal and Interest (SPPI) For the purposes of this assessment, ‘principal’ is defined as the fair value of the financial asset on initial recognition. ‘Interest’ is defined as consideration for the time value of money, for the credit risk associated with the principal amount outstanding during a particular period of time and for other basic lending risks and costs (e.g. liquidity risk and administrative costs), as well as a profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, Grupo Aval will consider the contractual terms of the instrument. This will include assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making the assessment, Grupo Aval will consider: – contingent events that would change the amount and timing of cash flows; – leverage features; – prepayment and extension terms; – terms that limit Grupo Aval’s claim to cash flows from specified assets – e.g. non-recourse asset arrangements; and – features that modify consideration for the time value of money – e.g. periodic reset of interest rates. Interest rates on certain corporate and retail loans made by Grupo Aval are based on standard variable rates (SVRs) that are set used generally in each country where the group operates and also include a discretional spread. In Colombian, the SVR is based on the interest rate named DTF and IBR which are calculated weekly by the Central Bank with base in information collected by all the Colombian financial system, plus a discretionary spread, and in the case of loans in foreign currency the group uses libor interest rates plus a discretionary spread. In these cases, Grupo Aval will assess whether the discretionary feature is consistent with the SPPI criterion by considering a number of factors, including whether: – The borrowers are able to prepay the loans without significant penalties. – the market competition ensures that interest rates are consistent between banks; and – any regulatory or customer protection framework is in place that requires banks to treat customers fairly. A prepayment feature is consistent with the SPPI criterion if the prepayment amount substantially represents unpaid amounts of principal and interest on the principal amount outstanding, which may include reasonable compensation for early termination of the contract. In addition, a prepayment feature is treated as consistent with this criterion if a financial asset is acquired or originated at a premium or discount to its contractual par amount, the prepayment amount substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable compensation for early termination), and the fair value of the prepayment feature is insignificant on initial recognition. Preliminary Impact Assessment The standard will affect the classification and measurement of financial assets held as at January 1, 2018 as follows. · Trading assets and derivative assets held for risk management, which are classified as held-for-trading and measured at FVTPL under IAS 39, will also be measured at FVTPL under IFRS 9. · Debt investment securities that are classified as available-for-sale under IAS 39 will also be measured at FVOCI under IFRS 9. · The majority of the equity investment securities that are classified as available-for-sale under IAS 39 will be measured at FVOCI under IFRS 9 on January 1, 2018. IFRS 9 removes the cost exception for unquoted equity investments, requiring all equity investments (and derivatives on them) to be measured at fair value, the impact of these changes (before tax) is an increase in Grupo Aval’s equity of approximately Ps. 65,123, a reduction of approximately Ps. 13,623 related to deferred tax effect, and the impact of these changes (after tax) is an increase in Grupo Aval’s equity of approximately Ps. 51,500. · Loans and advances to banks and to customers that are classified as loans and receivables and measured at amortized cost under IAS 39 will generally continue to be measured at amortized cost under IFRS 9. Grupo Aval has estimated that, on the adoption of IFRS 9 at January 1, 2018, few loans are classified FVTPL under IFRS 9 the impact of these changes (before tax) is an increase in Grupo Aval’s equity of approximately Ps. 603, reduction of approximately Ps. 181 related to deferred tax effect, and the impact of these changes (after tax) is an increase in Grupo Aval’s equity of approximately Ps. 422. ii. Impairment – Financial Assets, Loan Commitments and Financial Guarantee Contracts IFRS 9 replaces the ‘incurred loss’ model in IAS 39 with a forward-looking ‘expected credit loss’ model “ECL”. This will require considerable judgement over how changes in economic factors affect ECLs, which will be determined on a probability-weighted basis. The new impairment model applies to the following financial instruments that are not measured at FVTPL: – financial assets that are debt instruments; – lease receivables; and – loan commitments and financial guarantee contracts issued (previously, impairment was measured under IAS 37 Provisions, Contingent Liabilities and Contingent Assets Under IFRS 9, no impairment loss is recognized on equity investments. IFRS 9 requires a loss allowance to be recognized at an amount equal to either 12-month ECLs or lifetime ECLs. Lifetime ECLs are the ECLs that result from all possible default events over the expected life of a financial instrument, whereas 12-month ECLs are the portion of ECLs that result from default events that are expected within the 12 months after the reporting date. Grupo Aval will recognize a loss allowances at an amount equal to lifetime ECLs, except in the following cases, for which the amount recognized will be a 12-month ECLs: – debt investment securities that are determined to have low credit risk at the reporting date. Grupo Aval considers a debt security to have low credit risk when its credit risk rating is equivalent to the globally understood definition of ‘investment-grade’; and – other financial instruments (other than lease receivables) for which credit risk has not increased significantly since initial recognition. Loss allowances for lease receivables will always be measured at an amount equal to lifetime ECLs. The impairment requirements of IFRS 9 are complex and require management judgements, estimates and assumptions, particularly in the following areas, which are discussed in detail below: – assessing whether the credit risk of an instrument has increased significantly since initial recognition; and – incorporating forward-looking information into the measurement of ECLs. Measurement of ECLs ECLs are probability-weighted of credit losses and will be measured as follows: – financial assets that are not credit-impaired at the reporting date: – financial assets that are credit-impaired at the reporting date: – undrawn loan commitments: – financial guarantee contracts: Financial assets that are credit-impaired are defined by IFRS 9 in a similar way to financial assets that are impaired under IAS 39 (see note 2.6 g). Definition of Default Under IFRS 9, Grupo Aval will consider a financial asset to be in default when: – the borrower is unlikely to pay its credit obligations to Grupo Aval in full, without recourse by Grupo Aval to actions such as realizing collateral (if any is held); or – the borrower is more than 90 days past due on any material credit obligation to Grupo Aval. Overdrafts are considered past due once the customer has breached an advised limit or been advised of a limit that is smaller than the current amount outstanding. In assessing whether a borrower is in default, Grupo Aval will consider indicators that are: – qualitative: e.g. breaches of covenant; – quantitative: e.g. overdue status and non-payment of another obligation of the same issuer to Grupo Aval; and – based on data developed internally and obtained from external sources. Inputs into the assessment of whether a financial instrument is in default and their significance may vary over time to reflect changes in circumstances. Significant Increase in Credit Risk Under IFRS 9, when determining whether the credit risk (i.e. risk of default) on a financial instrument has increased significantly since initial recognition, Grupo Aval will consider reasonable and supportable information that is relevant and available without undue cost or effort, including both quantitative and qualitative information and analysis based on Grupo Aval’s historical experience, expert credit assessment and forward-looking information. Grupo Aval will primarily identify whether a significant increase in credit risk has occurred for an exposure by comparing: – the remaining lifetime probability of default (PD) as at the reporting date; with – the remaining lifetime PD for this point in time that was estimated on initial recognition of the exposure. Assessing whether credit risk has increased significantly since initial recognition of a financial instrument requires identifying the date of initial recognition of the instrument. For certain revolving facilities (e.g. credit cards and overdrafts), the date when the facility was first entered into could be a long time ago. Modifying the contractual terms of a financial instrument may also affect this assessment. Credit Risk Grades Grupo Aval will allocate each exposure to a credit risk grade based on a variety of data that is intended to be predictive of the risk of default and applying experienced credit judgement. Grupo Aval will use these grades in identifying significant increases in credit risk under IFRS 9. Credit risk grades are defined using qualitative and quantitative factors that are indicative of the risk of default. These factors may vary depending on the nature of the exposure and the type of borrower. Credit risk grades are defined and calibrated such that the risk of default occurring increases exponentially as the credit risk deteriorates – e.g. the difference in the risk of default between credit risk grades A and B is smaller than the difference between credit risk grades B and C. Each exposure will be allocated to a credit risk grade on initial recognition based on available information about the borrower. Exposures will be subject to ongoing monitoring, which may result in an exposure being moved to a different credit risk grade. Generating the Term Structure of PD Credit risk grades will be a primary input into the determination of the term structure of PD for exposures. Grupo Aval will collect performance and default information about its credit risk exposures analyzed by jurisdiction, by type of product and borrower and by credit risk grading. For some portfolios, information purchased from external credit reference agencies may also be used. Grupo Aval will employ statistical models to analyze the data collected and generate estimates of the remaining lifetime PD of exposures and how these are expected to change as a result of the passage of time. This analysis will include the identification and calibration of relationships between changes in default rates and changes in key macro-economic factors, as well as in-depth analysis of the impact of certain other factors (e.g. forbearance experience) on the risk of default. For most exposures, key macro- economic indicators are likely to include GDP growth, benchmark interest rates and unemployment. For exposures to specific industries and/or regions, the analysis may extend to relevant commodity and/ or real estate prices. Grupo Aval’s approach to incorporating forward-looking information into this assessment is discussed below. Grupo Aval has established a framework that incorporates both quantitative and qualitative information to determine whether the credit risk on a particular financial instrument has increased significantly since initial recognition. The framework aligns with Grupo Aval’s internal credit risk management process. The criteria for determining whether credit risk has increased significantly will vary by portfolio and will include a backstop based on delinquency. Grupo Aval will deem the credit risk of a particular exposure to have increased significantly since initial recognition if, based on Grupo Aval’s quantitative modelling, the remaining lifetime PD is determined to have increased significantly since initial recognition. In certain instances, using its expert credit judgement and, where possible, relevant historical experience, Grupo Aval may determine that an exposure has undergone a significant increase in credit risk if particular qualitative factors indicate so and those indicators may not be fully captured by its quantitative analysis on a timely basis. As a backstop, and as required by IFRS 9, Grupo Aval will presumptively consider that a significant increase in credit risk occurs no later than when an asset is more than 30 days past due. Grupo Aval will monitor the effectiveness of the criteria used to identify significant increases in credit risk by regular reviews to confirm that: – the criteria are useful in identifying significant increases in credit risk before an exposure is in default; – the criteria do not align with the point in time when an asset becomes 30 days past due; – the average time between the identification of a significant increase in credit risk and default appears reasonable; – exposures are not generally transferred directly from 12-month ECL measurement to credit-impaired; and – there is no unwarranted volatility in loss allowance from transfers between 12-month ECL and lifetime ECL measurements. Modified Financial Assets The contractual terms of a loan may be modified for a number of reasons, including changing market conditions, customer retention and other factors not related to a current or potential credit deterioration of the customer. An existing loan whose terms have been modified may be derecognized and the renegotiated loan recognized as a new loan at fair value. Under IFRS 9, when the terms of a financial asset are modified and the modification does not result in derecognition, the determination of whether the asset’s credit risk has increased significantly reflects comparison of: – the remaining lifetime PD at the reporting date based on the modified terms; with – the remaining lifetime PD estimated based on data on initial recognition and the original contractual terms. Grupo Aval renegotiates loans to customers in financial difficulties (referred to as ‘forbearance activities’) to maximize collection opportunities and minimize the risk of default. Under Grupo Aval’s forbearance policy, loan forbearance is granted on a selective basis if the debtor is currently in default on its debt or if there is a high risk of default, there is evidence that the debtor made all reasonable efforts to pay under the original contractual terms and the debtor is expected to be able to meet the revised terms. The revised terms usually include extending the maturity, changing the timing of interest payments and amending the terms of loan covenants. Both retail and corporate loans are subject to the forbearance policy. Grupo Aval Credit Committee regularly reviews reports on forbearance activities. For financial assets modified as part of Grupo Aval’s forbearance policy, the estimate of PD will reflect whether the modification has improved or restored Grupo Aval’s ability to collect interest and principal and Grupo Aval’s previous experience of similar forbearance action. As part of this process, Grupo Aval will evaluate the borrower’s payment performance against the modified contractual terms and consider various behavioral indicators. Generally, forbearance is a qualitative indicator of default and credit impairment and expectations of forbearance are relevant to assessing whether there is a significant increase in credit risk. Following forbearance, a customer needs to demonstrate consistently good payment behavior over a period of time before the exposure is no longer considered to be in default/credit-impaired or the PD is considered to have decreased such that the loss allowance reverts to being measured at an amount equal to 12-month ECLs. Inputs into Measurement of ECLs The key inputs into the measurement of ECLs are likely to be the term structures of the following variables: – probability of default (PD); – loss given default (LGD); and – exposure at default (EAD). These parameters will be derived from internally developed statistical models and other historical data that leverage regulatory models. They will be adjusted to reflect forward-looking information as described below. PD estimates are estimates at a certain date, which will be calculated based on statistical rating models and assessed using rating tools tailored to the various categories of counterparties and exposures. These statistical models will be based on internally compiled data comprising both quantitative and qualitative factors. Where it is available, market data may also be used to derive the PD for large corporate counterparties. If a counterparty or exposure migrates between rating classes, then this will lead to a change in the estimate of the associated PD. PDs will be estimated considering the contractual maturities of exposures and estimated prepayment rates. LGD is the magnitude of the likely loss if there is a default. Grupo Aval will estimate LGD parameters based on the history of recovery rates of claims against defaulted counterparties. The LGD models will consider the structure, collateral, seniority of the claim, counterparty industry and recovery costs of any collateral that is integral to the financial asset. For loans secured by retail property, loan-to-value (LTV) ratios will be a key parameter in determining LGD. LGD estimates will be calibrated for different economic scenarios and, for real estate lending, to reflect possible changes in property prices. They will be calculated on a discounted cash flow basis using the effective interest rate as the discounting factor. EAD represents the expected exposure in the event of a default. Grupo Aval will derive the EAD from the current exposure to the counterparty and potential changes to the current amount allowed under the contract, including amortization, and prepayments. The EAD of a financial asset will be the gross carrying amount at default. For lending commitments and financial guarantees, the EAD will consider the amount drawn, as well as potential future amounts that may be drawn or repaid under the contract, which will be estimated based on historical observations and forward-looking forecasts. For some financial assets, Grupo Aval will determine EAD by modelling the range of possible exposure outcomes at various points in time using scenario and statistical techniques. As described above, and subject to using a maximum of a 12-month PD for financial assets for which credit risk has not significantly increased, Grupo Aval will measure ECLs considering the risk of default over the maximum contractual period (including any borrower’s extension options) over which it is exposed to credit risk, even if, for risk management purposes, Grupo Aval considers a longer period. The maximum contractual period extends to the date at which Grupo Aval has the right to require repayment of an advance or terminate a loan commitment or guarantee. For retail overdrafts and credit card facilities and certain corporate revolving facilities that include both a loan and an undrawn commitment component, Grupo Aval will measure ECLs over a period longer than the maximum contractual period if Grupo Aval’s contractual ability to demand repayment and cancel the undrawn commitment does not limit Grupo Aval’s exposure to credit losses to the contractual notice period. These facilities do not have a fixed term or repayment structure and are managed on a collective basis. Grupo Aval can cancel them with immediate effect but this contractual right is not enforced in the normal day-to-day management, but only when Grupo Aval becomes aware of an increase in credit risk at the facility level. This longer period will be estimated taking into account the credit risk management actions that Grupo Aval expects to take and that serve to mitigate ECLs. These include a reduction in limits and cancellation of the facility. Where modelling of a parameter is carried out on a collective basis, the financial instruments will be grouped on the basis of shared risk characteristics that include: – instrument type; – credit risk gradings; – collateral type; – LTV ratio for retail mortgages; – date of initial recognition; – remaining term to maturity; – industry; and – geographic location of the borrower. The groupings will be subject to regular review to ensure that exposures within a particular group remain appropriately homogeneous. Forward-looking Information Under IFRS 9, Grupo Aval will incorporate forward-looking information into both its assessment of whether the credit risk of an instrument has increased significantly since initial recognition and its measurement of ECLs. Grupo Aval will formulate a ‘base case’ view of the future direction of relevant economic variables and a representative range of other possible forecast scenarios based on forecasts provided by economic experts, considering a variety of external actual and forecast information. This process will involve developing two or more additional economic scenarios and considering the relative probabilities of each outcome. The base case will represent a most-likely outcome and be aligned with information used by Grupo Aval for other purposes, such as strategic planning and budgeting. The other scenarios will represent more optimistic and more pessimistic outcomes. Grupo Aval has identified and documented key drivers of credit risk and credit losses for each portfolio of financial instruments and, using an analysis of historical data, has estimated relationships between macro-economic variables and credit risk and credit losses. These key drivers include interest rates, unemployment rates and GDP forecasts. Impact Assessment The most significant impact on Grupo Aval’s financial statements from the implementation of IFRS 9 is expected to result from the new impairment requirements. Impairment losses will increase and become more volatile for financial instruments in the scope of the IFRS 9 impairment model. Grupo Aval has estimated that, on the adoption of IFRS 9 at January 1, 2018, the impact of the increase in loss allowances (before tax) will be approximately Ps. 1,212,968. Taxes impact will be approximately Ps. 354,367. Loss allowances on unsecured products with longer expected lives such as overdrafts and credit cards will be most affected by the new impairment requirements. iii. Classification – Financial Liabilities IFRS 9 largely retains the existing requirements in IAS 39 for the classification of financial liabilities. However, under IAS 39 all fair value changes of financial liabilities designated as at FVTPL are recognized in profit or loss, whereas under IFRS 9 these fair value changes will generally be presented as follows: – the amount of the change in the fair value that is attributable to changes in the credit risk of the liability will be presented in OCI; and – the remaining amount of the change in the fair value will be presented in profit or loss. Grupo Aval does not have any impact over financial liabilities as no financial liabilities designated as at FVTPL are recorded under IAS 39 neither IFRS 9. iv. Derecognition and contract modification IFRS 9 incorporates the requirements of IAS 39 for the derecognition of financial assets and financial liabilities without substantive amendments. However, it contains specific guidance for the accounting when the modification of a financial instrument not measured at FVTPL does not result in derecognition. Under IFRS 9, the Group will recalculate the gross carrying amount of the financial asset (or the amortized cost of the financial liability) by discounting the modified contractual cash flows at the original effective interest rate and recognize any resulting adjustment as a modification gain or loss in profit or loss. Under IAS 39, the Group does not recognize any gain or loss in profit or loss on modifications of financial liabilities and nondistressed financial assets that do not lead to their derecognition. The Group expects an immaterial impact from adopting these new requirements. v. Hedge Accounting When initially applying IFRS 9, Grupo Aval may choose as its accounting policy to continue to apply the hedge accounting requirements of IAS 39 instead of the requirements in Chapter 6 of IFRS 9. Grupo Aval has elected to continue to apply IAS 39 until macro-hedging project has finalized. vi. Disclosures IFRS 9 will require extensive new disclosures, in particular about hedge accounting, credit risk and ECLs. vii. Transition Changes in accounting policies resulting from the adoption of IFRS 9 are generally applied retrospectively, except as described below. – Grupo Aval will take advantage of the exemption allowing it not to restate comparative information for prior periods with respect to classification and measurement (including impairment) changes. – Differences in the carrying amounts of financial assets and financial liabilities resulting from the adoption of IFRS 9 will generally be recognized in retained earnings and reserves as at January 1, 2018. The following assessments have to be made on the basis of the facts and circumstances that exist at the date of initial application: - The determination of the business model within which a financial asset is held. - The designation and revocati

REPORTING ENTITY (Tables)

REPORTING ENTITY (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Abstract]
Disclosure of information about consolidated structured entities [text block]	The following table presents details of Banco de Bogotá’s most significant subsidiaries which are indirectly consolidated by Grupo Aval as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Main Local Direct Subsidiaries Fiduciaria Bogotá S.A Management of trust funds. Bogotá, Colombia 94.99 % 65.29 % Porvenir S.A. and its subsidiary Management of pension and severance funds. Bogotá, Colombia 100 % 75.69 % Almaviva S.A and its subsidiaries Logistics services. Bogotá, Colombia 95.81 % 65.85 % Main International Direct Subsidiaries Leasing Bogotá Panama S.A. Holding company. (1) Panamá, Republic of Panamá 100 % 68.74 % Banco de Bogotá Panamá S.A. Commercial banking services. Panamá, Republic of Panamá 100 % 68.74 % Main Indirect Subsidiaries BAC Credomatic Inc. Holding company in charge of managing the banking and related subsidiaries in Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua and Panamá, among others. (Subsidiary of Leasing Bogotá Panamá S.A.). Panamá, Republic of Panamá 100 % 68.74 % (1) Leasing Bogotá Panamá, has no restrictions for transferring dividends to Colombia. The following table presents the details of Banco de Occidente’s most significant subsidiaries, which are indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Fiduciaria de Occidente S.A. Management of trust funds. Bogotá, Colombia 99.99 % 71.05 % Banco de Occidente (Panamá). S.A. Commercial banking services. Panamá, Republic of Panamá 95.00 % 68.66 % Occidental Bank Barbados Ltd. Commercial banking services. Barbados 100 % 72.27 % The following table presents the details of Banco Popular’s most significant subsidiaries which are indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic Fiduciaria Popular S.A. Management of trust funds. Bogotá, Colombia 94.85 % 88.91 % Alpopular S.A. Conservation and custody of documents; transportation of products at national and international levels. Bogotá, Colombia 71.10 % 66.65 % The following table presents the details of Banco AV Villas’ most significant subsidiary which is indirectly consolidated by Grupo Aval, as of December 31, 2017: Subsidiary Core business Location Total voting Total economic A Toda Hora S.A. ATH ATM network services and maintenance and software development Bogotá, Colombia 100 % 78.90 % The following table presents the details of Corficolombiana´s most significant subsidiaries which are indirectly consolidated by Grupo Aval, at December 31, 2017: Main Indirect Subsidiaries Subsidiary Core business Location Total voting Total economic Fiduciaria Corficolombiana S.A. Trust services Bogotá, Colombia 100 % 44.79 % Leasing Corficolombiana S.A. Financial services Bogotá, Colombia 100 % 44.79 % Banco Corficolombiana Panamá S.A. Commercial banking services. Panamá, Republic of Panamá 100 % 44.79 % Casa de Bolsa S.A. Securities brokerage and securities funds management. Bogotá, Colombia 97.30 % 63.84 % Hoteles Estelar S. A. and its subsidiaries Construction and operation of hotels, directly owned by third parties, in Colombia and abroad. Bogotá, Colombia 84.96 % 38.05 % Estudios y Proyectos del Sol S.A.S. and its subsidiaries Infrastructure projects. Bogotá, Colombia 100 % 44.79 % Pizano S.A. and its subsidiaries Timber production and transformation, industrial products manufacturing, construction supplies production. Bogotá, Colombia 59.38 % 31.27 % Organización Pajonales S. A. and its subsidiaries Investment and promotion of agricultural, livestock, forestry and agro industrial companies. Bogotá, Colombia 98.67 % 44.19 % Promigas S.A. E.S.P. and its subsidiaries Transportation and distribution of natural gas. Barranquilla, Colombia 50.23 % 22.50 % Estudios, Proyectos e Inversiones de los Andes S.A. and its subsidiaries Infrastructure projects. Bogotá, Colombia 99.93 % 44.76 % Plantaciones Unipalma de los Llanos S.A Development, production and sale of african palm products. Bogotá, Colombia 54.53 % 24.42 % Colombiana de Licitaciones y Concesiones S.A.S Infrastructure projects. Bogotá, Colombia 100 % 44.79 % Proyectos de Infraestructura S.A. – PISA and its subsidiaries Road and Infrastructure Concessions. Cali, Colombia 88.25 % 39.53 %

BASIS OF PREPARATION OF THE C46

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of voluntary change in accounting policy [abstract]
Disclosure Of Detailed Information Of Useful Lives And Depreciation Rates Of Property Plant And Equipment [Text Block]	Depreciation is estimated on a straight-line basis during the estimated useful life of the asset. The annual depreciation rates for each item of assets are: Asset Useful Life Own use buildings According to appraisals without exceeding 70 years Equipment, furniture and accessories From 3 to 10 years Machinery and equipment From 5 to 25 years Computer equipment From 3 to 12 years Vehicles From 5 to 10 years Bearer plants From 25 to 35 years

JUDGEMENTS AND CRITICAL ACCOU47

JUDGEMENTS AND CRITICAL ACCOUNTING ESTIMATES IN APPLYING ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Accounting Judgements And Estimates Explanatory [Abstract]
Disclosure of detailed information about sensitivity analysis of variables affecting the provision for loan portfolio impairment [Text Block]	The following table shows a sensitivity analysis of the most important variables affecting the calculation of the provision for loan portfolio impairment: December 31, 2017 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 447,231 (264,549 ) Loans assessed collectively: Probability of default 10 % 189,108 (261,537 ) Loss given default 10 % 219,445 (284,018 ) Loss identification period 1 month 198,259 (197,180 ) December 31, 2016 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 325,866 (191,518 ) Loans assessed collectively: Probability of default 10 % 176,162 (218,154 ) Loss given default 10 % 199,130 (234,327 ) Loss identification period 1 month 189,434 (178,529 ) December 31, 2015 Sensitivity Increase Decrease Loans assessed individually: Probability of default on estimated future cash flows 10 % 225,292 (196,350 ) Loans assessed collectively: Probability of default 10 % 115,401 (157,465 ) Loss given default 10 % 146,631 (163,341 ) Loss identification period 1 month 87,869 (102,626 )

RISK MANAGEMENT (Tables)

RISK MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Risk Management [Abstract]
Disclosure of credit risk exposure [text block]	The maximum exposure to credit risk of Grupo Aval, at a consolidated level is reflected in the carrying value of financial assets in the statement of financial position of Grupo Aval as of December 31, 2017 and 2016 as follows: Account December 31, December 31, Assets Cash and cash equivalents (**) Ps. 16,531,811 Ps. 17,294,457 Financial assets held for trading 2,650,536 2,343,902 Financial instruments available-for-sale 17,790,127 17,662,733 Financial instruments held-to-maturity 2,899,039 2,570,486 Other financial assets at fair value through profit or loss 2,282,611 2,072,674 Derivatives instruments 328,392 502,209 Hedging derivatives 55,261 128,479 Loans and receivables Commercial 99,428,894 93,149,211 Consumer 50,382,895 46,927,997 Mortgage 16,151,299 14,683,537 Microcredit 409,688 399,431 Other accounts receivable 4,466,134 3,719,672 Total financial assets with credit risk Ps. 213,376,687 Ps. 201,454,788 Financial instruments with credit risk outside of the statement of financial position at its nominal value Financial guarantees and letters of credit 3,495,921 3,510,546 Credit commitments 23,727,317 24,077,175 Total exposure to credit risk outside of the statement of financial position Ps. 27,223,238 Ps. 27,587,721 Total maximum exposure to credit risk Ps. 240,599,925 Ps. 229,042,509 (**) Not including funds in custody by the entity (cash, tellers, vaults), because there is no credit risk regarding Grupo Aval entities.
Disclosure of Detailed Information on Credit Portfolio [Text Block]	As of December 31, 2017 and 2016, the following chart shows the detail of the credit portfolio per type of guarantees received as support of credits issued by Grupo Aval at a consolidated level: December 31, 2017 Commercial Consumer Mortgages Microcredit Finance Total Unsecured credits Ps. 51,074,506 Ps. 42,566,151 Ps. 6,859 Ps. 275,701 Ps. 52,179 Ps. 93,975,396 Loans secured by other banks 350,562 4,284 - - 4,803 359,649 Collateralized credits: Mortgages 865,857 62,174 15,025,672 4,811 6,127 15,964,641 Other real estate 13,126,277 1,248,808 4,290 1,168 120,909 14,501,452 Investments in equity instruments 433,041 1,077 - - - 434,118 Deposits in cash or cash equivalents 2,172,911 141,891 - 101 - 2,314,903 Leased machineries and vehicles - - - - 9,151,139 9,151,139 Fiduciary agreements, stand by letters and guarantee funds 8,129,469 36,204 64,250 102,698 364,938 8,697,559 Pledged income 3,032,277 266 22 - 11,478 3,044,043 Pledges 3,859,626 5,728,752 1,597 1,290 20,452 9,611,717 Other assets 6,491,968 366,524 843 23,919 1,434,905 8,318,159 Total gross credit portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 December 31, 2016 Commercial Consumer Mortgages Microcredit Finance Total Unsecured credits Ps. 48,506,261 Ps. 39,350,056 Ps. 3,034 Ps. 270,027 Ps. 42,964 Ps. 88,172,342 Loans secured by other banks 413,049 3,145 - - 4,779 420,973 Collateralized credits: Mortgages 811,440 59,206 13,746,499 5,388 6,391 14,628,924 Other real estate 12,317,032 1,155,760 4,365 1,373 108,571 13,587,101 Investments in equity instruments 503,141 1,779 - - - 504,920 Deposits in cash or cash equivalents 1,987,187 149,516 - - - 2,136,703 Leased machineries and vehicles - - - - 9,254,960 9,254,960 Fiduciary agreements, stand by letters and guarantee funds 7,873,687 41,526 25,818 120,771 353,179 8,414,981 Pledged income 3,066,559 451 - - 5,741 3,072,751 Pledges 5,308,416 5,570,825 1,587 1,659 4,267 10,886,754 Other assets 2,404,344 380,125 130 213 1,294,955 4,079,767 Total gross credit portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) See Note 11.
Disclosure of Detailed Information on Credit Portfolio by Geographocal Area [Text Block]	The detail of credit risk at the level of Grupo Aval in the different geographic areas determined according to the domicile of the debtor, without taking into consideration loan loss provisions as of December 31, 2017 and 2016 is as follows. December 31, 2017 Commercial Consumer Mortgages Microcredit Finance Leases (1) Total Colombia Ps. 61,960,497 Ps. 32,878,650 Ps. 5,674,640 Ps. 409,688 Ps. 10,289,156 Ps. 111,212,631 Panamá 4,877,646 4,852,539 2,154,504 - 121,838 12,006,527 United States 6,433,333 736 10 - - 6,434,079 Costa Rica 3,833,906 4,848,689 3,868,474 - 712,686 13,263,755 Nicaragua 2,228,138 1,307,042 403,191 - 6,052 3,944,423 Honduras 2,794,260 1,736,449 740,113 - 3,251 5,274,073 El Salvador 1,746,193 2,267,152 897,404 - 9,747 4,920,496 Guatemala 4,807,329 2,264,791 1,365,197 - 24,200 8,461,517 Other countries 855,192 83 - - - 855,275 Total gross credit portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 (1) See Note 11. December 31, 2016 Commercial Consumer Mortgages Microcredit Finance Leases (1) Total Colombia Ps. 58,561,329 Ps. 30,523,917 Ps. 4,822,806 Ps. 399,431 Ps. 10,244,275 Ps. 104,551,758 Panamá 4,839,734 4,650,419 2,067,375 - 127,976 11,685,504 United States 5,186,307 436 16 - - 5,186,759 Costa Rica 3,329,869 4,390,441 3,674,158 - 665,281 12,059,749 Nicaragua 2,148,814 1,237,205 390,003 - 7,164 3,783,186 Honduras 2,292,105 1,597,280 720,987 - 3,867 4,614,239 El Salvador 1,499,044 2,076,588 873,870 - 11,977 4,461,479 Guatemala 4,455,244 2,080,065 1,232,218 - 15,267 7,782,794 Other countries 878,670 156,038 - - - 1,034,708 Total gross credit portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) See Note 11.
Disclosure of Detailed Information on Credit Portfolio by Economic Sector [Text Block]	Below is the credit portfolio distribution of Grupo Aval by economic sector as of December 31, 2017 and 2016: Sector December 31, 2017 % December 31, 2016 % Agricultural Ps. 3,940,981 2 % Ps. 3,734,625 2 % Mining products and oil 2,377,188 1 % 2,018,219 1 % Food, beverage and tobacco 8,165,975 5 % 7,273,602 5 % Chemical production 5,672,310 3 % 5,276,248 4 % Other industrial and manufacturing products 4,469,427 3 % 4,576,173 3 % Government 3,579,838 2 % 3,629,849 2 % Construction 10,313,655 7 % 9,959,536 7 % Trade and tourism 2,182,437 1 % 2,025,206 1 % Transportation and communications 7,566,374 5 % 7,814,741 5 % Public services 5,421,328 3 % 5,160,778 3 % Consumer services 70,947,936 43 % 66,157,872 43 % Commercial services 38,788,363 23 % 34,587,323 22 % Other 2,946,964 2 % 2,946,004 2 % Total of each economic sector Ps. 166,372,776 100 % Ps. 155,160,176 100 %
Disclosure of Detailed Information on Credit Portfolio of government issued securities [Text Block]	Below is the detail of Grupo Aval’s sovereign debt portfolio issued by Central Governments per country: December 31, 2017 December 31, 2016 % % Investment grade (1) Chile Ps. 24,932 0.19 % Ps. - 0.00 % Colombia 10,716,568 82.81 % 11,562,492 84.04 % Mexico - 0.00 % 9,126 0.07 % Panama 617,126 4.78 % 530,055 3.85 % USA 57,120 0.44 % 24,808 0.18 % Ps. 11,415,746 88.22 % Ps. 12,126,481 88.14 % Speculative (2) Argentina - 0.00 % 3,246 0.02 % Costa Rica 1,018,737 7.87 % 951,809 6.92 % El Salvador 76,682 0.59 % 85,626 0.62 % Guatemala 56,808 0.44 % 195,876 1.42 % Honduras 372,237 2.88 % 394,184 2.87 % Nicaragua 550 0.00 % 863 0.01 % Ps. 1,525,014 11.78 % Ps. 1,631,604 11.86 % Ps. 12,940,760 100.00 % Ps. 13,758,085 100.00 % Below is the detail of Grupo Aval’s debt portfolio issued by Central Banks: December 31, 2017 December 31, 2016 % % Investment Grade (1) Ps. - 0 % Ps. - 0 % Speculative (2) Costa Rica Ps. 207,474 14.92 % Ps. 124,695 20.33 % Guatemala 876,271 63.00 % 335,900 54.76 % Honduras 158,990 11.43 % 30,891 5.04 % Nicaragua 148,234 10.66 % 121,971 19.87 % Ps. 1,390,969 100.00 % Ps. 613,457 100.00 % Total sovereign risk Ps. 14,331,729 Ps. 14,371,542 (1) Investment grade includes the risk rating of Fitch Ratings Colombia S.A o F1+ to F3, BRC of Colombia from BRC 1+ to BRC 3 and Standard &; Poor’s from A1 to A3. (2) Speculative or non-investment grade level includes the risk rating of Fitch Ratings Colombia S.A. from B to E, BRC de Colombia from BRC 4 to BRC 6 and Standard &; Poor’s from B1 to D.
Disclosure of financial assets that are either past due or impaired [text block]	As of December 31, 2017 and 2016, a summary of the overdue portfolio by days past due is as follows: Arrears but not impaired December 31, 2017 Current From 1 to From 31 From 61 Total in Total Total Commercial Ps. 84,001,847 Ps. 1,062,814 Ps. 124,401 Ps. 91,658 Ps. 1,278,873 Ps. 4,255,774 Ps. 89,536,494 Consumer 44,677,006 1,881,589 593,525 295,676 2,770,790 2,708,335 50,156,131 Mortgage 13,886,169 536,926 165,971 69,120 772,017 445,347 15,103,533 Microcredit 296,613 38,827 9,285 6,230 54,342 58,733 409,688 Finance Leases (1) 10,010,568 401,444 50,032 26,855 478,331 678,031 11,166,930 Total loan portfolio value Ps. 152,872,203 Ps. 3,921,600 Ps. 943,214 Ps. 489,539 Ps. 5,354,353 Ps. 8,146,220 Ps. 166,372,776 Arrears but not impaired December 31, 2016 Current From 1 to From 31 From 61 Total in Total Total Commercial Ps. 78,780,803 Ps. 905,756 Ps. 109,524 Ps. 59,929 Ps. 1,075,209 Ps. 3,335,104 Ps. 83,191,116 Consumer 42,078,345 1,649,188 508,195 245,185 2,402,568 2,231,476 46,712,389 Mortgage 12,736,550 525,900 117,856 51,894 695,650 349,233 13,781,433 Microcredit 284,455 44,216 8,705 6,455 59,376 55,600 399,431 Finance Leases (1) 9,978,928 514,646 34,805 20,623 570,074 526,805 11,075,807 Total loan portfolio value Ps. 143,859,081 Ps. 3,639,706 Ps. 779,085 Ps. 384,086 Ps. 4,802,877 Ps. 6,498,218 Ps. 155,160,176 (1) See Note 11
Disclosure of internal credit grades [text block]	As of December 31, 2017 and 2016, the following is a summary of the portfolio credit by risk level rating. December 31, 2017 December 31, 2016 Commercial “A” Normal Risk Ps. 82,217,135 Ps. 77,930,507 “B” Acceptable Risk 2,093,079 1,996,137 “C” Appreciable Risk 2,735,103 1,818,112 “D” Significant Risk 1,620,293 910,746 “E” Risk of nonrecoverability 870,884 535,614 89,536,494 83,191,116 Consumer “A” Normal Risk 45,794,015 42,956,173 “B” Acceptable Risk 1,364,520 1,240,377 “C” Appreciable Risk 1,232,881 1,169,752 “D” Significant Risk 1,256,089 984,334 “E” Risk of nonrecoverability 508,626 361,753 50,156,131 46,712,389 Mortgage “A” Normal Risk 14,208,051 13,104,010 “B” Acceptable Risk 324,925 247,334 “C” Appreciable Risk 326,237 234,954 “D” Significant Risk 79,707 62,383 “E” Risk of nonrecoverability 164,613 132,752 15,103,533 13,781,433 Microcredit “A” Normal Risk 341,194 337,391 “B” Acceptable Risk 11,871 11,687 “C” Appreciable Risk 6,742 9,432 “D” Significant Risk 7,342 7,523 “E” Risk of nonrecoverability 42,539 33,398 409,688 399,431 Financial leasing “A” Normal Risk 9,874,243 10,136,530 “B” Acceptable Risk 489,323 443,437 “C” Appreciable Risk 394,534 206,397 “D” Significant Risk 309,726 211,983 “E” Risk of nonrecoverability 99,104 77,460 Financial leasing portfolio gross balance Ps. 11,166,930 Ps. 11,075,807 Gross balance of financial assets per credit portfolio Ps. 166,372,776 Ps. 155,160,176
Disclosure of Detailed Information on Credit Portfolio by restructuring [Text Block]	The following is the balance of restructured loans as of December 31, 2017 and 2016: Restructured loans December 31, 2017 December 31, 2016 Local Ps. 2,674,637 Ps. 3,179,875 Foreign 643,756 526,703 Total restructured Ps. 3,318,393 Ps. 3,706,578
Disclosure of Detailed Information on Foreclosed Assets [Text Block]	During the years ended December 31, 2017 and 2016, the following is the total of foreclosed assets received and sold during such periods: December 31, 2017 December 31, 2016 Foreclosed assets received Ps. 106,030 Ps. 220,400 Foreclosed assets sold 64,038 44,677
Disclosure of Detailed information on Credit Worthiness [Text Block]	a) Cash and cash equivalents December 31, 2017 December 31, 2016 Investment grade Ps. 9,391,266 Ps. 10,978,574 Central Bank 3,820,538 3,598,126 Financial entities 5,570,728 7,338,920 Others - 41,528 Speculative grade 6,679,084 5,887,086 Central Bank 5,993,380 5,381,681 Financial entities 685,704 505,405 Without grade or not available 461,461 428,797 Central Bank 1,469 1,724 Financial entities 459,909 426,826 Others 83 247 Cash and cash equivalent with third parties Ps. 16,531,811 Ps. 17,294,457 Cash held by entity (**) 5,805,027 4,898,547 Total Ps. 22,336,838 Ps. 22,193,004 (**) Cash held by Bank in custody in vaults, ATMs and cash. b) Held-for-trading investments Debt securities December 31, 2017 December 31, 2016 Investment grade Sovereign (*) Ps. 1,231,219 Ps. 985,455 Other Public Entities(**) 70,064 79,789 Corporate 68,286 84,880 Financial Entities 1,007,540 959,085 Total investment grade Ps. 2,377,109 Ps. 2,109,209 Speculative grade Sovereign(*) Ps. 92,931 Ps. 88,095 Central Banks 34,095 74,727 Financial Entities 129,985 71,871 Total Speculative grade Ps. 257,011 Ps. 234,693 Without Grade or Not available Corporate Ps. 16,416 Ps. - Total Without Grade or Not available Ps. 16,416 Ps. - Ps. 2,650,536 Ps. 2,343,902 (*) A sovereign credit rating considers the risk of Treasury issuer or similar agency (government debt portfolio). (**) Derived from operations with government entities; including public administrations in general (plus regional and local). c) Available-for-sale financial assets Debt Securities December 31, 2017 December 31, 2016 Investment grade Sovereign(*) Ps. 10,157,239 Ps. 11,115,044 Other Public Entities(**) 662,702 569,312 Corporate 148,738 341,099 Financial Entities 2,975,485 2,149,641 Multilaterals 104,885 93,069 Total investment grade Ps. 14,049,049 Ps. 14,268,165 Speculative grade Sovereign(*) 1,432,083 1,543,509 Central Banks 1,356,874 538,731 Corporate 274,450 366,482 Financial Entities 642,592 822,729 Total Speculative grade Ps. 3,705,999 Ps. 3,271,451 Without Grade or Not available Corporate 563 82,663 Financial Entities - 15,705 Total Without Grade or Not available Ps. 563 Ps. 98,368 Default (***) Corporate 34,516 24,749 Total Default 34,516 24,749 Ps. 17,790,127 Ps. 17,662,733 (*) A sovereign credit rating considers the risk of Treasury issuer or similar agency (government debt portfolio). (**) Derived from operations with government entities; including public administrations in general (plus regional and local). (***)Includes investments in the Brazilian Telecommunications Company OI S.A. And its subsidiary Telemar Norte Leste S.A., which requested to avail themselves of the judicial protection law after declaring bankruptcy on June 20, 2016. d) Held-to-maturity investments December 31, 2017 December 31, 2016 Investment Grade Sovereign(*) Ps. 27,288 Ps. 25,981 Other Public Entities(**) 2,839,286 2,484,078 Corporate - 1,541 Financial Entities 8,635 - Multilaterals - 58,886 Total investment Grade Ps. 2,875,209 Ps. 2,570,486 Without Grade or Not available Financial Entities 23,830 - Total Without Grade or Not available 23,830 - Ps. 2,899,039 Ps. 2,570,486 (*) A sovereign credit rating considers the risk of Treasury issuer or similar agency (government debt portfolio). (**)Derived from operations with government entities; including public administrations in general (plus regional and local). e) Derivative instruments and hedging derivatives The details of credit rating determined by independent credit rating agents of counterparties in trading asset derivative instruments and hedging derivative instruments are as follows. Credit Worthiness December 31, 2017 December 31, 2016 Investment Grade Ps. 312,426 Ps. 528,823 Speculative 503 248 Without Grade or not available 70,724 101,617 Total Ps. 383,653 Ps. 630,688
Disclosure of assets and liabilities exposed to trading risk [Text Block]	The following is a breakdown of Grupo Aval’s financial assets and liabilities exposed to trading risk held at December 31, 2017 and 2016. December 31, 2017 December 31, 2016 Account Financial assets Debt financial assets Trading Ps. 2,650,536 Ps. 2,343,902 Available-for-sale 17,790,127 17,662,733 Total Ps. 20,440,663 Ps. 20,006,635 Derivative instruments Ps. 328,392 Ps. 502,209 Hedging derivatives 55,261 128,479 383,653 630,688 Total financial assets Ps. 20,824,316 Ps. 20,637,323 Liabilities Derivative instruments 298,665 640,695 Hedging derivatives 13,464 43,436 Total financial liabilities 312,129 684,131 Net position Ps. 20,512,187 Ps. 19,953,192
Disclosure of Detailed Information about Financial Subsidiaries Risk [Text Block]	According to the standard model, the market value-at-risk (VaR) for Grupo Aval´s financial subsidiaries consolidated at their level at December 31, 2017 and 2016 was as follows: December 31, 2017 December 31, 2016 Bank Value Basis points of Value Basis points of Banco Bogotá 829,846 109 579,486 81 Banco de Occidente 184,223 56 141,794 56 Banco Popular 125,265 79 120,572 85 Banco AV Villas 18,394 20 89,402 130 Corficolombiana 159,214 9 159,697 11
Disclosure of Detailed Information about Financial Subsidiaries Risk by Type [Text Block]	Banco de Bogotá S.A Maximum, Minimum and Average VaR Values December 31, 2017 Minimum Average Maximum Period end Interest rate 309,368 342,043 400,828 321,121 Exchange rate 12,424 52,925 304,429 304,429 Shares 7,234 7,068 8,099 8,099 Mutual funds 187,698 184,582 196,197 196,197 VaR Portfolio 523,306 586,619 829,846 829,846 Maximum, Minimum and Average VaR Values December 31, 2016 Minimum Average Maximum Period end Interest rate 324,908 496,788 711,827 346,303 Exchange rate 26,940 37,336 57,160 57,160 Shares 5,090 9,622 15,089 6,002 Mutual funds 149,082 160,274 170,020 170,020 VaR Portfolio 550,562 704,020 909,405 579,486 Banco de Bogota´s market risk weighted assets remained on average around 7.5 % of the total risk-weighted assets during the year ended December 31, 2017 and 5.5% on the year ended December 31, 2016. Banco de Occidente S.A Maximum, Minimum and Average VaR Values December 31, 2017 Minimum Average Maximum Period end Interest rate 140,044 162,463 184,209 174,379 Exchange rate 1,424 3,119 7,034 7,034 Shares - - - - Mutual funds 2,580 2,702 2,811 2,811 VaR Portfolio 145,108 168,284 190,502 184,224 Maximum, Minimum and Average VaR Values December 31, 2016 Minimum Average Maximum Period end Interest rate 131,840 154,398 172,552 137,221 Exchange rate 1,488 2,172 3,567 2,029 Shares - - - - Mutual funds 2,545 3,628 3,898 2,545 VaR Portfolio 137,343 160,199 177,946 141,794 Banco de Occidente´s market risk weighted assets remained on average around 5.9% of the total risk-weighted assets during the year ended December 31, 2017 and 4.2% for the year ended December 31, 2016. Banco Popular S.A Maximum, Minimum and Average VaR Values December 31, 2017 Minimum Average Maximum Period end Interest rate 103,535 115,033 122,910 119,856 Exchange rate 4 662 3,329 3,329 Shares 945 965 967 946 Mutual funds 1,019 1,085 1,203 1,134 VaR Portfolio 105,635 117,745 126,486 125,265 Maximum, Minimum and Average VaR Values December 31, 2016 Minimum Average Maximum Period end Interest rate 103,097 129,470 149,375 118,920 Exchange rate 17 703 2,551 273 Shares 732 813 947 764 Mutual funds 490 582 683 615 VaR Portfolio 104,583 131,567 150,964 120,572 Banco Popular´s market risk weighted assets remained on average around 7.5% of the total risk-weighted assets during the year ended December 31, 2017 and 9.6% on the year ended December 31, 2016. Banco Comercial AV Villas S.A Maximum, Minimum and Average VaR Values December 31, 2017 Minimum Average Maximum Period end Interest rate 12,563 37,998 89,381 14,206 Exchange rate - 670 1,572 1,448 Shares - - - - Mutual funds 481 1,394 6,373 2,741 VaR Portfolio 15,198 40,061 89,960 18,394 Maximum, Minimum and Average VaR Values December 31, 2016 Minimum Average Maximum Period end Interest rate 89,066 100,756 113,347 89,268 Exchange rate 0,3 307 862 7 Shares - - - - Mutual funds 96 115 169 126 VaR Portfolio 89,243 101,178 114,065 89,402 Banco AV Villas´s market risk weighted assets remained on average around 2.2% of the total risk-weighted assets during the year ended December 31, 2017 and 13.6% on the year ended December 31, 2016. Corficolombiana S.A Maximum, Minimum and Average VaR Values December 31, 2017 Minimum Average Maximum Period end Interest rate 81,334 104,098 144,232 144,232 Exchange rate 656 2,332 4,041 4,041 Shares 9,691 10,601 11,072 10,800 Mutual funds 116 891 2,669 140 VaR Portfolio 95,312 117,460 159,214 159,214 Maximum, Minimum and Average VaR Values December 31, 2016 Minimum Average Maximum Period end Interest rate 130,771 219,143 282,081 141,553 Exchange rate 1,263 3,799 8,730 3,263 Shares 8,471 10,608 12,295 11,975 Mutual funds 373 2,140 3,498 2,906 VaR Portfolio 146,966 235,689 293,983 159,697
Description of detailed information about investments subject to value at risk [Text Block]	A substantial amount of Grupo Aval's foreign currency assets and liabilities are in U.S. dollars. Details on the assets and liabilities in foreign currency held by Grupo Aval at December 31, 2017 and 2016 are shown below: December 31, 2017 Account U.S. dollars Other currencies Total in Colombian Financial assets Cash and cash equivalents 3,541 1,052 13,706,552 Investments in debt securities held for trading 134 24 470,430 Investments in securities available-for-sale 2,564 631 9,532,417 Investments in debt securities held-to-maturity 17 - 50,695 Loan portfolio financial assets at amortized cost 16,217 4,500 61,817,662 Trading derivatives 91 1 274,691 Hedge derivatives 19 - 55,261 Other accounts receivable 161 202 1,083,678 Total financial assets 22,744 6,410 86,991,386 Account U.S. dollars Other currencies Total in Colombian Financial liabilities Trading derivatives 85 1 256,865 Hedge derivatives 5 - 13,464 Customer deposits 14,572 4,909 58,087,999 Financial obligations 8,624 660 27,808,291 Accounts payable 437 - 1,304,929 Total financial liabilities 23,723 5,600 87,471,548 Net financial asset (liability) position (979 ) 810 (480,162 ) December 31, 2016 Account U.S. dollars Other currencies Total in Colombian Financial assets Cash and cash equivalents 3,898 1,009 14,694,459 Investments in debt securities held for trading 172 - 516,926 Investments in securities available-for-sale 2,741 - 8,224,549 Investments in debt securities held-to-maturity 9 - 25,693 Trading derivatives 128 26 462,278 Loan portfolio financial assets at amortized cost 14,149 4,682 56,505,459 Other accounts receivable 318 - 955,677 Hedge derivatives 43 - 128,479 Total financial assets 21,458 5,717 81,513,520 Account U.S. dollars Other currencies Total in Colombian Financial liabilities Trading derivatives 134 70 613,376 Hedge derivatives 14 - 43,436 Customer deposits 13,214 4,463 53,014,364 Financial obligations 9,219 - 27,664,167 Accounts payable 384 - 1,150,537 Total financial liabilities 22,964 4,533 82,485,880 Net financial asset (liability) position (1,506 ) 1,184 (972,360 )
Disclosure of Detailed Information about Foreign Currency Assets and Liabilities [Text Block]	A substantial amount of Grupo Aval's foreign currency assets and liabilities are in U.S. dollars. Details on the assets and liabilities in foreign currency held by Grupo Aval at December 31, 2017 and 2016 are shown below: December 31, 2017 Account U.S. dollars Other currencies Total in Colombian Financial assets Cash and cash equivalents 3,541 1,052 13,706,552 Investments in debt securities held for trading 134 24 470,430 Investments in securities available-for-sale 2,564 631 9,532,417 Investments in debt securities held-to-maturity 17 - 50,695 Loan portfolio financial assets at amortized cost 16,217 4,500 61,817,662 Trading derivatives 91 1 274,691 Hedge derivatives 19 - 55,261 Other accounts receivable 161 202 1,083,678 Total financial assets 22,744 6,410 86,991,386 Account U.S. dollars Other currencies Total in Colombian Financial liabilities Trading derivatives 85 1 256,865 Hedge derivatives 5 - 13,464 Customer deposits 14,572 4,909 58,087,999 Financial obligations 8,624 660 27,808,291 Accounts payable 437 - 1,304,929 Total financial liabilities 23,723 5,600 87,471,548 Net financial asset (liability) position (979 ) 810 (480,162 ) December 31, 2016 Account U.S. dollars Other currencies Total in Colombian Financial assets Cash and cash equivalents 3,898 1,009 14,694,459 Investments in debt securities held for trading 172 - 516,926 Investments in securities available-for-sale 2,741 - 8,224,549 Investments in debt securities held-to-maturity 9 - 25,693 Trading derivatives 128 26 462,278 Loan portfolio financial assets at amortized cost 14,149 4,682 56,505,459 Other accounts receivable 318 - 955,677 Hedge derivatives 43 - 128,479 Total financial assets 21,458 5,717 81,513,520 Account U.S. dollars Other currencies Total in Colombian Financial liabilities Trading derivatives 134 70 613,376 Hedge derivatives 14 - 43,436 Customer deposits 13,214 4,463 53,014,364 Financial obligations 9,219 - 27,664,167 Accounts payable 384 - 1,150,537 Total financial liabilities 22,964 4,533 82,485,880 Net financial asset (liability) position (1,506 ) 1,184 (972,360 )
Schedule of Interest Rate Risk on Assets and Liabilities [Text Block]	The following table shows interest rates exposure for assets and liabilities at December 31, 2017 and 2016. In this table, fixed rate instruments are classified according to the maturity date and floating rate instruments are classified according to the re-pricing date. The following analysis includes all the global interest rate exposure in each bucket for our banks: December 31, 2017 Assets Less than From one to From six to More than a Non- Total Cash and cash equivalents Ps. 2,378,528 Ps. - Ps. - Ps. - Ps. 19,958,310 Ps. 22,336,838 Debt securities held for trading 169,328 497,031 580,030 1,404,147 - 2,650,536 Debt securities available-for-sale 495,315 1,537,630 1,300,390 14,456,792 - 17,790,127 Debt securities held-to-maturity 722,026 832,703 1,338,712 5,598 - 2,899,039 Service concession arrangements - - - 2,282,611 - 2,282,611 Commercial loans and leases 21,760,032 43,162,885 7,089,736 27,416,241 - 99,428,894 Consumer loans and leases 10,003,247 8,953,299 1,731,816 29,694,533 - 50,382,895 Mortgages and housing leases 3,539,706 5,354,545 404,417 6,852,631 - 16,151,299 Microcredit loans and leases 26,553 18,028 38,197 326,910 - 409,688 Other accounts receivable - - - 890,896 3,575,238 4,466,134 Total Assets Ps. 39,094,735 Ps. 60,356,121 Ps. 12,483,298 Ps. 83,330,359 Ps. 23,533,548 Ps. 218,798,061 Liabilities Less than From one to From six to More than a Non- Total Checking accounts Ps. 20,597,270 Ps. - Ps. - Ps. - Ps. 15,420,332 Ps. 36,017,602 Time deposits 12,733,132 24,212,202 13,456,116 12,214,713 - 62,616,163 Saving deposits 55,778,677 - - - - 55,778,677 Other deposits - - - - 472,782 472,782 Interbank and overnight funds 4,836,246 134,184 - - - 4,970,430 Borrowing from banks and other 3,249,799 5,801,906 2,200,184 6,953,431 - 18,205,320 Long-term debt 123,261 6,500,197 416,407 12,062,331 - 19,102,196 Borrowing from development entities 523,786 1,353,790 93,154 1,027,360 - 2,998,090 Total Liabilities Ps. 97,842,171 Ps. 38,002,279 Ps. 16,165,861 Ps. 32,257,835 Ps. 15,893,114 Ps. 200,161,260 December 31, 2016 Assets Less than From one to From six to More than a Non- Total Cash and cash equivalents Ps. 885,572 Ps. - Ps. - Ps. - Ps. 21,307,432 Ps. 22,193,004 Debt securities held for trading 584,277 354,424 249,249 1,155,952 - 2,343,902 Debt securities available-for-sale 97,048 151,277 5,882,444 11,531,964 - 17,662,733 Debt securities held-to-maturity 51,042 2,488,507 25,693 5,244 - 2,570,486 Service concession arrangements - - - 2,072,674 - 2,072,674 Commercial loans and leases 19,446,228 54,284,920 4,799,382 14,618,681 - 93,149,211 Consumer loans and leases 4,060,610 8,528,968 1,387,001 32,951,418 - 46,927,997 Mortgages and housing leases 3,896,339 423,374 105,437 10,258,387 - 14,683,537 Microcredit loans and leases 3,183 18,536 34,455 343,257 - 399,431 Other accounts receivable - - - 440,275 3,279,397 3,719,672 Total Assets Ps. 29,024,299 Ps. 66,250,006 Ps. 12,483,661 Ps. 73,377,852 Ps. 24,586,829 Ps. 205,722,647 Liabilities Less than From one to From six to More than a Non- Total Checking accounts Ps. 21,843,630 Ps. - Ps. - Ps. - Ps. 13,134,559 Ps. 34,978,189 Time deposits 9,250,329 23,292,407 10,725,534 14,737,874 - 58,006,144 Saving deposits 50,573,924 - - - - 50,573,924 Other deposits - - - - 328,798 328,798 Interbank and overnight funds 6,171,336 144,381 - - - 6,315,717 Borrowing from banks and other 2,636,761 5,724,376 1,961,526 7,583,970 - 17,906,633 Long-term debt 2,463,493 4,715,900 753,451 10,635,392 - 18,568,236 Borrowing from development entities 448,532 1,289,977 173,197 813,989 - 2,725,695 Total Liabilities Ps. 93,388,005 Ps. 35,167,041 Ps. 13,613,708 Ps. 33,771,225 Ps. 13,463,357 Ps. 189,403,336 December 31, 2017 Under one year Over one year Non- Assets Variable Fixed Variable Fixed interest Total Cash due from banks and Central Bank Ps. - Ps. 2,378,528 Ps. - Ps. - Ps. 19,958,310 Ps. 22,336,838 Debt securities held for trading 140,796 1,153,157 331,589 1,024,994 - 2,650,536 Debt securities available-for-sale 44,213 3,289,129 2,128,817 12,327,968 - 17,790,127 Debt securities held-to-maturity 2,841,714 51,727 - 5,598 - 2,899,039 Service concession arrangements - - 2,282,611 - - 2,282,611 Commercial loans and leases 37,026,675 10,240,136 49,061,715 3,100,368 - 99,428,894 Consumer loans and leases 942,057 15,282,475 9,725,059 24,433,304 - 50,382,895 Mortgages and housing leases 74,604 477,646 9,695,527 5,903,522 - 16,151,299 Microcredit loans and leases 2,266 207,099 4,550 195,773 - 409,688 Other account receivables - - 842,173 107,559 3,516,402 4,466,134 Total Assets Ps. 41,072,325 Ps. 33,079,897 Ps. 74,072,041 Ps. 47,099,086 Ps. 23,474,712 Ps. 218,798,061 Under one year Over one year Non- Liabilities Variable Fixed Variable Fixed interest Total Checking accounts Ps. - Ps. 20,597,270 Ps. - - Ps. 15,420,332 Ps. 36,017,602 Time deposits 10,785,649 33,777,955 7,605,647 10,446,912 - 62,616,163 Saving deposits 9,156,432 46,622,245 - - - 55,778,677 Other deposits - - - - 472,782 472,782 Interbank and overnight funds 106,495 4,863,935 - - - 4,970,430 Borrowing from banks and other 4,327,736 5,026,923 3,900,072 4,950,589 - 18,205,320 Long-term debt 534,852 851,809 6,772,587 10,942,948 - 19,102,196 Borrowing from development entities 373,707 11,399 2,608,953 4,031 - 2,998,090 Total Liabilities Ps. 25,284,871 Ps. 111,751,536 Ps. 20,887,259 Ps. 26,344,480 Ps. 15,893,114 Ps. 200,161,260 December 31, 2016 Under one year Over one year Non- Assets Variable Fixed Variable Fixed interest Total Cash due from banks and Central Bank Ps. - Ps. 885,572 Ps. - Ps. - Ps. 21,307,432 Ps. 22,193,004 Debt securities held for trading 203,422 799,566 256,467 1,084,447 - 2,343,902 Debt securities available-for-sale 76,170 3,323,386 179,413 14,083,764 - 17,662,733 Debt securities held-to-maturity 2,486,514 78,860 3,928 1,184 - 2,570,486 Service concession arrangements - - 2,072,674 - - 2,072,674 Commercial loans and leases 28,138,078 12,039,918 40,904,474 12,066,741 - 93,149,211 Consumer loans and leases 413,928 12,779,524 2,001,963 31,732,582 - 46,927,997 Mortgages and housing leases 83,339 324,246 5,363,330 8,912,622 - 14,683,537 Microcredit loans and leases 9,958 156,761 6,903 225,809 - 399,431 Other account receivables - - 440,275 - 3,279,397 3,719,672 Total Assets Ps. 31,411,409 Ps. 30,387,833 Ps. 51,229,427 Ps. 68,107,149 Ps. 24,586,829 Ps. 205,722,647 Under one year Over one year Non- Liabilities Variable Fixed Variable Fixed interest Total Checking accounts Ps. - Ps. 21,843,630 Ps. - - Ps. 13,134,559 Ps. 34,978,189 Time deposits 13,079,866 29,792,727 6,057,772 9,075,779 - 58,006,144 Saving deposits 70,783 50,234,077 - 269,064 - 50,573,924 Other deposits - - - - 328,798 328,798 Interbank and overnight funds 712,355 5,603,362 - - - 6,315,717 Borrowing from banks and other 3,187,556 5,173,581 4,458,094 5,087,402 - 17,906,633 Long-term debt 1,314,956 4,234,039 4,737,643 8,281,598 - 18,568,236 Borrowing from development entities 529,843 - 2,195,852 - - 2,725,695 Total Liabilities Ps. 18,895,359 Ps. 116,881,416 Ps. 17,449,361 Ps. 22,713,843 Ps. 13,463,357 Ps. 189,403,336
Disclosure of detailed information about requested percentage of deposits to be maintained as reserves in each country [Text Block]	Details on the requested percentage in each country are shown below: Requested Percentage Country Details % Colombia Checking account and Savings accounts 11 % Time deposits > 18 months 4.5 % Guatemala Deposits and Capital raising 11.6 % El Salvador 1st Demand deposits (1) 25 % 2nd Demand deposits (2) 25 % 3rd Debt securities 50 % Honduras Demand deposits 12 % Mandatory investment in local currency 5 % Mandatory investment in foreign currency 12 % Nicaragua Daily, Liabilities in local and foreign currency 12 % Biweekly, Liabilities in local and foreign currency 14 % Costa Rica Deposits in local and foreign currency 15 % Capital raising in local and foreign currency 15 % (1) This refer to demand deposits in Central Bank or overseas banks. (2) This refer to demand deposits in Central Bank, overseas banks or debt securities issue by Central Bank.
Disclosure of detailed information about the breakdown by time bands of the Liquid Assets and the Liquidity Risk Indicator [Text Block]	December 31, 2017 Bank Liquid assets From 1 to 7 days From 8 to 15 days From 16 to 30 From 31 to 90 days Banco de Bogotá 9,883,150 9,446,780 8,436,530 7,161,523 1,082,066 Banco Occidente 7,184,470 6,876,625 6,657,883 5,567,110 2,350,522 Banco Popular 2,905,827 2,629,285 2,332,527 1,726,392 (256,330 ) Banco AV Villas 1,776,252 1,701,634 1,577,328 1,506,404 478,347 Corficolombiana 1,603,609 1,059,878 942,372 649,166 361,394 December 31, 2016 Bank Liquid assets From 1 to 7 days From 8 to 15 days From 16 to 30 From 31 to 90 days Banco de Bogotá 10,058,552 8,732,532 5,604,879 3,786,496 (2,999,598 ) Banco Occidente 3,882,343 3,453,308 3,158,023 2,638,916 1,081,962 Banco Popular 2,628,298 2,445,146 2,212,315 1,511,457 (212,024 ) Banco AV Villas 1,952,334 1,723,991 1,554,462 1,206,529 56,614 Corficolombiana 1,475,836 871,378 795,495 490,178 (187,120 ) (1) Liquid assets are the sum of the assets that are readily convertible to cash. These assets include cash on hand and bank deposits including Central Bank deposits, securities or coupons that have been transferred to the entity in money market transactions and have not been used in borrowing operations in the money market. It also includes investments in debt securities recorded at fair value, investments in mutual funds with no withdrawal restrictions, and debt securities carried at amortized cost, provided they are legally required or “mandatory” investments, subscribed in the primary market and that can be used for money market operations. The value of the liquid assets mentioned above, is calculated at the fair value market price on the date of the assessment. (2) This amount is the remaining value of the liquid assets in the specified time period, or the LRI, that is calculated as the difference among the liquid assets and the liquidity requirement. The liquidity requirement is the difference of contractual cash inflows and contractual and non-contractual cash outflows during the period according to the LRI methodology.
Disclosure of detailed information about the breakdown by contractual undiscounted cash flows of the financial assets and liabilities including projected contractual interest receivable and payable [Text Block]	December 31, 2017 Assests Less than From one to From six to More than a Non - Total Cash and cash equivalents Ps. - Ps. - Ps. - Ps. - Ps. 23,420,225 Ps. 23,420,225 Investments in debt securities held for trading 913,190 310,701 619,023 1,316,239 - 3,159,152 Investments in securities available-for-sale 622,057 1,968,847 1,810,606 18,818,121 - 23,219,631 Investments in debt securities held-to-maturity 649,833 934,821 1,576,581 5,946 - 3,167,181 Commercial loans and leases 14,641,827 30,985,969 15,378,967 66,048,385 - 127,055,148 Consumer loans and leases 4,524,515 12,114,983 7,186,854 34,943,876 - 58,770,228 Mortgages and housing leases 263,314 1,228,796 1,434,850 28,060,685 - 30,987,645 Microcredit loans and leases 49,932 117,240 119,397 261,625 - 548,194 Trading derivatives 249,305 103,245 33,859 29,329 - 415,738 Hedging derivatives 52,122 2,657 1,752 - - 56,531 Other accounts receivable - 238 163 1,013,167 3,745,261 4,758,829 Other assets - - - - 482,636 482,636 Total Assets Ps. 21,966,095 Ps. 47,767,497 Ps. 28,162,052 Ps. 150,497,373 Ps. 27,648,122 Ps. 276,041,139 Liabilities Less than From one to From six to More than a Non - Total Checking accounts Ps. 40,840,666 Ps. - Ps. - Ps. - Ps. - Ps. 40,840,666 Time Deposits 9,583,488 21,734,913 15,150,201 21,094,851 - 67,563,454 Saving deposits 58,656,060 - - - - 58,656,060 Other deposits 471,645 - - 34,275 - 505,920 Interbank and overnight funds 4,274,983 166,891 - - - 4,441,874 Borrowing from banks and other 1,963,636 6,359,672 4,262,502 8,417,134 - 21,002,945 Long-term debt 52,468 5,780,195 531,963 18,902,134 - 25,266,760 Borrowing from development entities 36,954 258,909 301,372 4,338,700 - 4,935,935 Trading derivatives 120,429 377,898 3,918 7,107 - 509,351 Hedging derivatives 13,345 119 - - - 13,464 Other Liabilities 2,165,287 58,605 50,583 - 4,351,782 6,626,258 Total Liabilities Ps. 118,178,961 Ps. 34,737,201 Ps. 20,300,540 Ps. 52,794,200 Ps. 4,351,782 Ps. 230,362,686 December 31, 2016 Assests Less than From one to From six to More than a Non - Total Cash and cash equivalents Ps. - Ps. - Ps. - Ps. - Ps. 23,431,502 Ps. 23,431,502 Investments in debt securities held for trading 820,683 541,799 331,319 1,078,497 - 2,772,298 Investments in securities available-for-sale 944,879 1,531,453 1,506,568 16,979,066 - 20,961,966 Investments in debt securities held-to-maturity 529,014 880,233 1,219,842 17,888 - 2,646,977 Commercial loans and leases 11,627,160 22,248,731 14,210,565 56,169,672 - 104,256,128 Consumer loans and leases 5,039,323 10,345,530 6,034,277 35,590,184 - 57,009,314 Mortgages and housing leases 146,691 727,017 846,720 23,968,085 - 25,688,513 Microcredit loans and leases 39,582 116,175 129,340 263,682 - 548,779 Other accounts receivable 783,812 222,986 747,269 11,981 - 1,766,048 Trading derivatives 377,946 85,736 18,311 14,186 - 496,179 Hedging derivatives 123,672 3,540 4,607 - - 131,819 Other assets - - - - 589,415 589,415 Total Assets Ps. 20,432,762 Ps. 36,703,200 Ps. 25,048,818 Ps. 134,093,241 Ps. 24,020,917 Ps. 240,298,938 Liabilities Less than From one to From six to More than a Non - Total Checking accounts Ps. 35,176,430 Ps. - Ps. - Ps. - Ps. - Ps. 35,176,430 Time deposits 9,280,758 24,443,943 12,490,712 15,013,753 - 61,229,166 Saving deposits 51,684,382 - - - - 51,684,382 Other deposits 309,940 2,292 16,584 - - 328,816 Interbank and overnight funds 5,877,059 476,679 - - - 6,353,738 Borrowing from banks and other 1,279,413 5,799,940 4,459,671 11,584,008 - 23,123,032 Long-term debt 2,166,658 1,233,436 1,241,972 14,775,950 - 19,418,016 Borrowing from development entities 28,507 251,343 244,463 3,105,206 - 3,629,519 Trading derivatives Ps. 406,656 Ps. 164,753 Ps. 85,827 Ps. 86,295 Ps. - Ps. 743,531 Hedging derivatives 44,650 684 942 - - 46,276 Other Liabilities - - - - 5,957,192 5,957,192 Total Liabilities Ps. 106,254,453 Ps. 32,373,070 Ps. 18,540,171 Ps. 44,565,212 Ps. 5,957,192 Ps. 207,690,098
Disclosure of detailed information about the calculation of the minimum regulatory capital [Text Block]	Following is the detail of the calculation of the minimum regulatory capital, required for the entites regulated by the Superintendency of Finance: Regulatory Capital December 31, 2017 Banco de Bogotá Banco de Banco Popular Banco AV Corficolombiana Regulatory Capital 16,749,137 4,007,636 2,090,131 1,195,815 2,666,487 Basic ordinary equity 10,870,598 3,123,860 1,774,823 1,060,749 2,295,929 Basic additional equity 5,878,538 883,776 315,309 135,066 370,558 Market Risk 9,220,514 1,660,535 1,391,833 204,852 1,769,041 Total assets weighted by risk 123,708,231 28,165,602 18,452,556 9,493,492 7,246,604 Total solvency risk index. 13.54 % 13.44 % 10.53 % 12.33 % 36.80 % Basic solvency risk index. 8.79 % 10.47 % 8.94 % 10.94 % 31.68 % Regulatory Capital December 31, 2016 Banco de Bogotá Banco de Banco Popular Banco AV Corficolombiana Regulatory Capital 16,236,204 3,801,455 2,103,019 1,119,136 2,611,410 Basic ordinary equity 10,456,131 3,029,445 1,756,321 1,002,396 2,247,231 Basic additional equity 5,780,073 772,010 346,698 116,740 364,179 Market Risk 6,438,729 1,233,358 1,339,691 993,172 1,676,891 Total assets weighted by risk 116,745,434 29,588,532 18,919,825 9,768,306 7,114,069 Total solvency risk index. 13.91 % 12.85 % 11.12 % 11.46 % 36.71 % Basic solvency risk index. 8.96 % 10.24 % 9.28 % 10.26 % 31.59 %

ESTIMATION OF FAIR VALUE (Table

ESTIMATION OF FAIR VALUE (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Estimations of Fair Value [Line Items]
Disclosure of detailed information about the sensitivity analysis of fair value of mortgage-backed securities under three different scenarios [Text Block]	The following table shows the sensitivity analysis of this fair value under three different scenarios. December 2017 Baseline scenario (i) Favorable scenario (ii) Unfavorable scenario (iii) Ps. 19,602 Ps. 80 Ps. (95 ) December 2016 Baseline scenario (i) Favorable scenario (ii) Unfavorable scenario (iii) Ps. 27,377 Ps. 302 Ps. (343 ) (i) Fair value as of December 31, 2017 and 2016 calculated based on valuation scenario, considers 12-month Moving Average Prepayment between 12.4% and 15.8% and 12.3% and 16.0% respectively, and 1 Time Delinquency Curve. (ii) Pre-payment of 10% and 1 time delinquency curve (iii) Pre-payment of 20% and 1 time delinquency curve
Disclosure of detailed information about sensitivity analysis of the assumptions used by Promigas and its subsidiaries in the calculation of fair value of unconditional transfer rights of gas pipelines to Government entities [Text Block]	The following table includes a sensitivity analysis of the assumptions used by Promigas and its subsidiaries in the calculation of fair value of unconditional transfer rights of gas pipelines to Government entities at the expiration date of the contracts. The fair value of the financial asset at December 31, 2017 is Ps. 2,282,611 and Ps. 2,072,674 at December 31, 2016. December 31, 2017 December 31, 2016 Variable +100 bps -100 bps +100 bps -100 bps WACC Ps. (608,164 ) Ps. 949,005 Ps. (534,128 ) Ps. 810,001 Growth rate 520,052 (362,867 ) 434,225 (293,491 )
Disclosure of detailed information about Yield per hectare Based on the crop composition and the planting year of the different clones [Text Block]	Yield per hectare: Based on the crop composition and the planting year of the different clones, we forecasted a stepwise yield per hectare starting in year 7 after plantation and stabilizing after year 10. Year Tons of rubber per Year 7 0.60 Year 8 0.90 Year 9 1.40 Year 10 and other 1.80
Disclosure of detailed information about Yield per hectare Based on the crop composition and the planting year of the crops [Text Block]	Yield per hectare: Based on the crop composition and the re-planting year of the crops, which started in 2006, we forecasted a stepwise yield per hectare for each plantation as follows: Year Tons of fresh fruit 0 to 3 - 4 4.25 5 9.91 6 11.73 7 21.58 8 to 25 21.80 More than 25 36.10
Disclosure of detailed information about the oil extraction rate that defines the amount of crude palm oil that is produced [Text Block]	Extraction rate: The oil extraction rate (OER) is a factor that defines the amount of crude palm oil that is produced. The OER varies depending on the age of the plantation, and was forecasted based on the following table: Year Extraction Rate 0 to 3 19 4 23 5 23 6 23 7 23 8 to 25 23 More than 25 21 Weighted average 22.14
Disclosure of detailed information about transfer of fair value between level 1 and 2 [Text Block]	The following table summarizes the transfer between fair value levels 1 and 2 during 2017 and 2016. In general, transfers between Level 1 and Level 2 in the investment portfolios are due, fundamentally, to changes in the liquidity levels of the securities in the markets. December 31, 2017 December 31, 2016 Transfers between: Transfers between: Level 2 to Level 1 Level 2 to Level 1 to Trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. - Ps. 28,153 Ps. 963,794 Ps. 208,526 Securities issued or secured by other financial entities - - - - Ps. - Ps. 28,153 Ps. 963,794 Ps. 208,526 In Foreign Currency Securities issued or secured by other entities of the Colombian Government Ps. - Ps. 10,221 Ps. - Ps. - Securities issued or secured by foreign Governments - - - - Securities issued or secured by central banks - - - - Securities issued or secured by other financial entities - 65,209 - 1,547 Securities issued or secured by entities of the Non-financial sector - 85,552 - - Other - - - - Ps. - Ps. 160,982 Ps. - Ps. 1,547 Ps. - Ps. 189,135 Ps. 963,794 Ps. 210,073
Disclosure of detailed information about Changes in Level 3 Fair-Value Category [Text Block]	The reconciliation of the balances at the begining of the period to the closing balances with the fair value measurements classified at Level 3 is shows in the following table. Financial assets Equity Financial assets in Biological Investment January 1, 2015 Ps. 36,821 Ps. - Ps. 1,738,598 Ps. 202,399 Ps. 366,742 Valuation adjustment with an effect on income 2,892 - 153,094 22,922 104,769 Valuation adjustments with an effect on OCI (3,636 ) - - - - Additions - - - 35,265 89,679 Sales/disposals - - - (20,374 ) (22,944 ) December 31, 2015 Ps. 36,077 Ps. - Ps. 1,891,692 Ps. 240,212 Ps. 538,246 Valuation adjustment with an effect on income 750 - 180,982 14,644 53,680 Valuation adjustments with an effect on OCI (9,450 ) - - - - Reclassification of bearer plants balance - - - (188,177 ) - Effects of amendments in accounting policies of bearer plants. - - - (18,108 ) - Transfers to non-current assets held for sale - - - - 11,319 Reclassification - - - (1,331 ) (2,539 ) Additions - - - 21,432 71,268 Sales/disposals Ps. - Ps. - Ps. - Ps. (20,670 ) Ps. (61,786 ) December 31, 2016 Ps. 27,377 Ps. - Ps. 2,072,674 Ps. 48,002 Ps. 610,188 Valuation adjustment with an effect on income 765 - 209,937 13,503 46,675 Valuation adjustments with an effect on OCI (8,540 ) - - - - Transfers from non-current assets held for sale - - - - 101,469 Reclassification - 25,341 - - (30,143 ) Additions - - - 24,409 84,036 Sales/disposals Ps. - Ps. - Ps. - Ps. (19,775 ) Ps. (28,431 ) December 31, 2017 Ps. 19,602 Ps. 25,341 Ps. 2,282,611 Ps. 66,139 Ps. 783,794
Disclosure of detailed information about financial assets and liabilities accounted at amortized cost and valued at fair value only for purposes of this disclosure [Text Block]	The following table shows a summary of financial assets and liabilities accounted at amortized cost and valued at fair value, as of December 31, 2017 and 2016 only for disclosure purposes. December 31, 2017 December 31, 2016 Carrying Fair Value Carrying Fair Value Assets Investments in fixed income held-to-maturity (1) Ps. 2,899,039 Ps. 2,928,929 Ps. 2,570,486 Ps. 2,558,333 Credit portfolio at amortized cost (2) 160,754,295 166,303,676 150,898,732 159,917,633 Total financial assets Ps. 163,653,334 Ps. 169,232,605 Ps. 153,469,218 Ps. 162,475,966 Liabilities Customer deposits (3) Ps. 154,885,224 Ps. 154,805,726 Ps. 143,887,055 Ps. 146,778,588 Financial Liabilities (4) 45,276,036 45,413,210 45,516,281 46,545,065 Total financial Liabilities Ps. 200,161,260 Ps. 200,218,936 Ps. 189,403,336 Ps. 193,323,653 (1) Financial assets held-to-maturity Fair value of fixed income investments at amortized cost was determined using the dirty price given by the price supplier, securities in an active market and with a market price for the day of the valuation are classified as level 1, securities with no active market and/or with an estimated price (present value of the flows of a security, discounted with the reference rate and the corresponding margin) given by the supplier are classified as level 2. (2) Credit portfolio at amortized cost For credit portfolio at amortized cost it fair value was determined using discounted of cash flows models at the interest rates offered by banks for granting new loans, taking into account the credit risk and its maturity; the process of valuation is deemed as level 3. Accounts receivables and payables are classified as short-term assets and liabilities; in consequence, their fair value are similar to their book value. (3) Customer deposits The fair value of demand deposits is equal to their carrying value. For fixed-term deposits with maturities of less than 180 days, its fair value is deemed equal to its carrying value. For fixed-term deposits with maturities of more than 180 days, its fair value was estimated using the carrying discounted cash flow models to the interest rates offered by banks in accordance with their maturity. This is considered this as a level 2 valuation. (4) Financial liabilities For financial liabilities and other short-term liabilities, the carrying value was considered similar to its fair value. The fair value of long-term financial liabilities was determined using the discounted cash flow model at interest rates free of risk adjusted by risk premiums of each entity. The fair value of outstanding bonds is determined according to quoted prices or estimated prices supplied by the price vendor. It is considered that this is a level 2 valuation.
Rubber Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [text block]	Rubber Plantations TSR20 reference price Change in fiscal year- Value of the biological Effect on profits 1,620 5 % 25,366 10.762 Dec-17 1,543 - 24,158 9.554 1,466 (5 )% 22,950 8.346 1,907 5 % 15,628 9.888 Dec-16 1,817 - 14,606 8.899 1,726 (5 )% 13,584 7.910
African Palm Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [text block]	African Palm Plantations CPO reference price Change in fiscal year- Value of the biological Effect on profits 683 5 % 27,883 5.068 Dec-17 651 - 26,555 3.740 618 (5 )% 25,228 2.412 637 5 % 23,109 5.495 Dec-16 606 - 21,597 5.354 576 (5 )% 20,085 3.213
Recurring fair value measurement [member]
Disclosure Of Estimations of Fair Value [Line Items]
Disclosure Of Fair Value Measurement Of Assets and liabilities [Text Block]	The following table presents an analysis, within the hierarchy of fair value, of Grupo Aval´s assets and liabilities (by class), measured at fair value as of December 31, 2017 and 2016 on a recurring basis. December 31, 2017 Level 1 Level 2 Level 3 Total Assets Held for trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 1,104,829 Ps. 124,777 Ps. - Ps. 1,229,606 Securities issued or secured by other entities of the Colombian Government - 48,355 - 48,355 Securities issued or secured by other financial entities - 833,860 - 833,860 Securities issued or secured by entities of the Non-financial sector - 17,869 - 17,869 Other - 37,442 12,975 50,417 In Foreign Currency Securities issued or secured by Colombian Government - 1,613 - 1,613 Securities issued or secured by other entities of the Colombian Government - 21,709 - 21,709 Securities issued or secured by foreign Governments - 92,931 - 92,931 Securities issued or secured by central banks - 34,095 - 34,095 Securities issued or secured by other financial entities - 303,665 - 303,665 Other - 16,416 - 16,416 Total held for trading debt securities Ps. 1,104,829 Ps. 1,532,732 Ps. 12,975 Ps. 2,650,536 Investments in debt securities available-for-sale In Colombian Pesos Securities issued or secured by the Colombian Government 7,668,545 224,009 - 7,892,554 Securities issued or secured by other entities of the Colombian Government - 92,008 - 92,008 Securities issued or secured by other financial entities - 263,633 - 263,633 Securities issued or secured by entities of the Non-financial sector - 2,326 - 2,326 Other - 563 6,627 7,190 In Foreign Currency Securities issued or secured by Colombian Government - 1,592,371 - 1,592,371 Securities issued or secured by other entities of the Colombian Government - 570,694 - 570,694 Securities issued or secured by foreign Governments 29,604 2,074,793 - 2,104,397 Securities issued or secured by central banks - 1,356,874 - 1,356,874 Securities issued or secured by other financial entities 456,354 2,898,090 - 3,354,444 Securities issued or secured by entities of the Non-financial sector - 322,143 - 322,143 Other - 231,493 - 231,493 Total investments in debt securities available-for sale Ps. 8,154,503 Ps. 9,628,997 Ps. 6,627 Ps. 17,790,127 Total investments in debt securities Ps. 9,259,332 Ps. 11,161,729 Ps. 19,602 Ps. 20,440,663 Equity securities Trading equity securities 28,659 2,095,160 25,341 2,149,160 Investments in equity securities available-for-sale 768,336 55,697 - 824,033 Total equity securities Ps. 796,995 Ps. 2,150,857 Ps. 25,341 Ps. 2,973,193 Held for trading Derivatives Currency Forward - 222,377 1,578 223,955 Bond Forward - 731 - 731 Interest Rate Swap - 52,970 - 52,970 Currency Swap - 33,104 - 33,104 Currency Options 17,632 - 17,632 Total held for trading derivatives Ps. - Ps. 326,814 Ps. 1,578 Ps. 328,392 Hedging Derivatives Currency Forward - 55,261 - 55,261 Total hedging derivatives Ps. - Ps. 55,261 Ps. - Ps. 55,261 Other financial assets at fair value through profit or loss Financial assets in concession contracts - - 2,282,611 2,282,611 Total financial assets designated at fair value Ps. 10,056,327 Ps. 13,694,661 Ps. 2,329,132 Ps. 26,080,120 Non- financial assets Biological assets - - 66,139 66,139 Investment properties - - 783,794 783,794 Total non- financial assets Ps. - Ps. - Ps. 849,933 Ps. 849,933 Total assets at fair value on recurring basis Ps. 10,056,327 Ps. 13,694,661 Ps. 3,179,065 Ps. 26,930,053 Liabilities Trading Derivatives Currency Forward - 142,760 1,812 144,572 Bond Forward - 1,107 - 1,107 Interest Rate Swap - 40,693 - 40,693 Currency Swap - 79,263 - 79,263 Currency Options - 33,030 - 33,030 Total trading derivatives Ps. Ps. 296,853 Ps. 1,812 Ps. 298,665 Hedging Derivatives Currency Forward - Ps. 13,464 Ps. - Ps. 13,464 Total hedging derivatives Ps. - 13,464 - 13,464 Total liabilities at fair value on recurring basis Ps. - Ps. 310,317 Ps. 1,812 Ps. 312,129 December 31, 2016 Level 1 Level 2 Level 3 Total Assets Held for trading debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 887,218 Ps. 78,521 Ps. - Ps. 965,739 Securities issued or secured by other entities of the Colombian Government - 38,400 - 38,400 Securities issued or secured by other financial entities - 737,884 - 737,884 Securities issued or secured by entities of the Non-financial sector - 18,657 - 18,657 Other - 54,085 12,210 66,295 In Foreign Currency Securities issued or secured by Colombian Government - 19,716 - 19,716 Securities issued or secured by other entities of the Colombian Government 330 20,747 - 21,077 Securities issued or secured by foreign Governments - 88,095 - 88,095 Securities issued or secured by central banks - 74,727 - 74,727 Securities issued or secured by other financial entities - 313,129 - 313,129 Other - 183 - 183 Total held for trading debt securities Ps. 887,548 Ps. 1,444,144 Ps. 12,210 Ps. 2,343,902 Investments in debt securities available-for-sale In Colombian Pesos Securities issued or secured by the Colombian Government 8,281,946 922,232 - 9,204,178 Securities issued or secured by other entities of the Colombian Government - 79,435 - 79,435 Securities issued or secured by other financial entities - 120,795 - 120,795 Securities issued or secured by entities of the Non-financial sector - 17,923 - 17,923 Other - 685 15,167 15,852 In Foreign Currency Securities issued or secured by Colombian Government - 1,371,029 - 1,371,029 Securities issued or secured by other entities of the Colombian Government 22,550 467,327 - 489,877 Securities issued or secured by foreign Governments - 2,083,345 - 2,083,345 Securities issued or secured by central banks - 538,731 - 538,731 Securities issued or secured by other financial entities 375,798 2,580,127 - 2,955,925 Securities issued or secured by entities of the Non-financial sector 80,638 500,152 - 580,790 Other - 204,853 - 204,853 Total investments in debt securities available-for-sale Ps. 8,760,932 Ps. 8,886,634 Ps. 15,167 Ps. 17,662,733 Total investments in debt securities Ps. 9,648,480 Ps. 10,330,778 Ps. 27,377 Ps. 20,006,635 Equity securities Trading equity securities 3,233 1,744,381 - 1,747,614 Investments in equity securities available-for-sale 655,096 74,683 - 729,779 Total equity securities Ps. 658,329 Ps. 1,819,064 Ps. - Ps. 2,477,393 Held for trading Derivatives Currency Forward - 391,370 - 391,370 Interest Rate Swap - 39,780 - 39,780 Currency Swap - 44,594 - 44,594 Currency Options - 26,313 - 26,313 Interest Rate Options - 152 - 152 Total held for trading derivatives Ps. - Ps. 502,209 Ps. - Ps. 502,209 Hedging Derivatives Currency Forward - 128,479 - 128,479 Total hedging derivatives Ps. - Ps. 128,479 Ps. - Ps. 128,479 Other financial assets designated at fair value through profit or loss Financial assets in concession contracts - - 2,072,674 2,072,674 Total financial assets designated at fair value Ps. - Ps. - Ps. 2,072,674 Ps. 2,072,674 Non- financial assets Biological assets - - 48,002 48,002 Investment properties - - 610,188 610,188 Total non- financial assets Ps. - Ps. - Ps. 658,190 Ps. 658,190 Total assets at fair value on recurring basis Ps. 10,306,809 Ps. 12,780,530 Ps. 2,758,241 Ps. 25,845,580 Liabilities Trading Derivatives Currency Forward - 408,903 - 408,903 Securities Forward - 1,492 - 1,492 Interest Rate Swap - 25,827 - 25,827 Currency Swap - 164,906 - 164,906 Currency Options - 39,567 - 39,567 Total trading derivatives Ps. - Ps. 640,695 Ps. - Ps. 640,695 Hedging Derivatives Currency Forward - 43,436 - 43,436 Total hedging derivatives Ps. - Ps. 43,436 Ps. - Ps. 43,436 Total liabilities at fair value on recurring basis Ps. - Ps. 684,131 Ps. - Ps. 684,131
Non-recurring fair value measurement [member]
Disclosure Of Estimations of Fair Value [Line Items]
Disclosure Of Fair Value Measurement Of Assets and liabilities [Text Block]	The following table present Grupo Aval’s assets and liabilities, classified within the fair value hierarchy, which are measured on a nonrecurring basis as of December 31, 2017 and 2016 at fair value less cost of sale: December 31, 2017 Level 1 Level 2 Level 3 Total Impaired collateralized loans Ps. - Ps. - Ps. 701,948 Ps. 701,948 Non- current assets held for sale - - 101,382 101,382 Ps. - Ps. - Ps. 803,330 Ps. 803,330 December 31, 2016 Level 1 Level 2 Level 3 Total Impaired collateralized loans Ps. - Ps. - Ps. 657,080 Ps. 657,080 Non- current assets held for sale - - 259,528 259,528 Ps. - Ps. - Ps. 916,608 Ps. 916,608

CASH AND CASH EQUIVALENTS (Tabl

CASH AND CASH EQUIVALENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of cash and cash equivalents [Abstract]
Disclosure of deailed information about cash and cash equivalents [Text Block]	Balances of cash and cash equivalents comprise the following as of December 31, 2017 and 2016: December 31, December 31, In Colombian Pesos Cash Ps. 4,100,166 Ps. 3,476,270 In the Colombian Central Bank 3,820,539 3,598,125 Demand deposits in banks and other financial entities 312,661 380,610 Clearing 1,733 2,435 Investments in debt securities maturing in under three months 28,603 41,064 Restricted cash (1) 366,584 41 Ps. 8,630,286 Ps. 7,498,545 In foreign currency Cash 1,704,861 1,422,278 Demand deposits in banks and other financial entities 11,999,859 13,268,996 Restricted cash (2) 1,832 3,185 Ps. 13,706,552 Ps. 14,694,459 Total cash and cash equivalents Ps. 22,336,838 Ps. 22,193,004 (1) Grupo Aval has restricted cash related to the collection of tolls on concessions and banking reserve. The increase presented is mainly attributable to the business combination of Concesionaria Vial del Pacífico S.A.S. Ps. 89,491 and Concesionaria Nueva Vía al Mar S.A.S. Ps. 119,524 (Grupo Aval considers this acquisition non-significant ) and restricted cash related to unpaid pension balances at Industrial Lehner Ps. 67,777. (2) Grupo Aval has restricted cash related to deposits in guarantee for Banco Corficolombiana Panama S.A and Gas Comprimido del Peru S.A.

DEBT AND EQUITY SECURITIES HE51

DEBT AND EQUITY SECURITIES HELD-FOR-TRADING (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of financial assets held for trading through profit or losses [Line Items]
Disclosure of detailed information about financial assets [Text Block]	The balance of debt and equity securities held for trading comprises the following as of December 31, 2017 and 2016: December 31, December 31, Debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 1,229,606 Ps. 965,739 Securities issued or secured by other Colombian Government entities 48,355 38,400 Securities issued or secured by other financial entities 833,860 737,884 Securities issued or secured by Non-financial sector entities 17,869 18,657 Others 50,417 66,296 Ps. 2,180,107 Ps. 1,826,976 In foreign currency Securities issued or secured by Colombian Government 1,613 19,716 Securities issued or secured by other Colombian Government entities 21,709 21,076 Securities issued or secured by Foreign Governments 92,931 88,095 Securities issued or secured by Central Banks 34,095 74,727 Securities issued or secured by other financial entities 303,665 313,129 Others 16,416 183 Ps. 470,429 Ps. 516,926 Total trading debt securities Ps. 2,650,536 Ps. 2,343,902 Equity securities In Colombian Pesos Corporate Stock Ps. 4,188 Ps. 3,233 Investment Funds 802,941 644,063 Pension and severance funds (1) 1,279,009 1,100,318 Ps. 2,086,138 Ps. 1,747,614 In foreign currency Corporate Stock 49,812 - Investment Funds 13,210 - Ps. 63,022 Ps. - Total Equity Securities Ps. 2,149,160 Ps. 1,747,614 Total Trading Securities Ps. 4,799,696 Ps. 4,091,516 (1) Pursuant to Colombian rules the subsidiary Porvenir S. A. is required to directly invest in mandatory severance and pension funds managed by Porvenir, 1% of the total assets of these funds.
Disclosure of detailed information about financial assets used as collaeral in repo operations [Text Block]	The following is a list of held-for-trading financial assets that are being used as collateral in repo operations, pledged as collateral for transactions with financial instruments, or pledged to third parties as collateral to secure financial obligations with other banks (See note 21). December 31, December 31, Pledged as collateral in money market operations Securities issued or secured by Central Banks Ps. 5,217 Ps. 5,611 Securities issued or secured by Foreign Governments 54,644 50,831 Securities issued or secured by Colombian Government 744,332 562,986 Securities issued or secured by other financial entities 9,590 9,693 Ps. 813,783 Ps. 629,121 Pledged as collateral to special entities such as CRCC, BR and BVC (*) Securities issued or secured by Colombian Government Ps. 29,292 Ps. - 29,292 - Ps. 843,075 Ps. 629,121 (*) Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valores de Colombia - BVC

AVAILABLE- FOR- SALE FINANCIA52

AVAILABLE- FOR- SALE FINANCIAL ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of available for sale financial assets [Abstract]
Disclosure of detailed information about available for sale assets [Text Block]	The following is the balance of available-for-sale financial assets at December 31, 2017 and 2016. December 31, 2017 Cost Unrealized Unrealized Fair Value Available-for-sale securities Debt Securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 7,855,098 Ps. 68,411 Ps. (30,955 ) Ps. 7,892,554 Securities issued or secured by other Colombian Government entities 90,532 1,566 (90 ) 92,008 Securities issued or secured by other financial entities 255,192 8,643 (202 ) 263,633 Securities issued or secured by Non-financial sector entities 2,282 44 - 2,326 Others 7,074 116 - 7,190 Ps. 8,210,178 Ps. 78,780 Ps. (31,247 ) Ps. 8,257,711 In foreign currency Securities issued or secured by Colombian Government 1,587,359 9,160 (4,148 ) 1,592,371 Securities issued or secured by other Colombian Government entities 565,762 11,685 (6,753 ) 570,694 Securities issued or secured by Foreign Governments 2,113,106 8,655 (17,364 ) 2,104,397 Securities issued or secured by Central Banks 1,359,924 739 (3,789 ) 1,356,874 Securities issued or secured by other financial entities 3,366,119 3,210 (14,885 ) 3,354,444 Securities issued or secured by Non-financial sector entities (**) 345,003 21,681 (44,541 ) 322,143 Others 230,412 2,710 (1,629 ) 231,493 Ps. 9,567,685 Ps. 57,840 Ps. (93,109 ) Ps. 9,532,416 Total Debt Securities Ps. 17,777,863 Ps. 136,620 Ps. (124,356 ) Ps. 17,790,127 Equity Instruments In Colombian Pesos Corporate Stock Ps. 276,452 Ps. 541,520 Ps. (75 ) Ps. 817,897 In foreign currency Corporate Stock 452 5,684 - 6,136 Total Equity Securities Ps. 276,904 Ps. 547,204 Ps. (75 ) Ps. 824,033 Total available-for-sale investments and unrealized gain (loss) in Other Comprehensive Income Ps. 18,054,767 Ps. 683,824 Ps. (124,431 ) Ps. 18,614,160 (*) Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from two issuers were classified as impaired and realized the impairment in statement of profit or loss as explained in below (**). (**) Cost is net of Ps. 71,708 for impairment recognized in statement of income as operating expense for the securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries filed for bankruptcy protection on June, 2016. December 31, 2016 Cost Unrealized Unrealized Fair Available-for-sale securities Debt Securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 9,371,078 Ps. 16,622 Ps. (183,521 ) Ps. 9,204,179 Securities issued or secured by other Colombian Government entities 83,582 386 (4,533 ) 79,435 Securities issued or secured by other financial entities 116,683 4,317 (205 ) 120,795 Securities issued or secured by Non-financial sector entities 18,390 - (467 ) 17,923 Others 15,820 33 (1 ) 15,852 Ps. 9,605,553 Ps. 21,358 Ps. (188,727 ) Ps. 9,438,184 In foreign currency Securities issued or secured by Colombian Government 1,368,836 7,018 (4,825 ) 1,371,029 Securities issued or secured by other Colombian Government entities 496,223 1,843 (8,189 ) 489,877 Securities issued or secured by Foreign Governments 2,082,953 13,400 (13,008 ) 2,083,345 Securities issued or secured by Central Banks 539,393 596 (1,258 ) 538,731 Securities issued or secured by other financial entities 2,978,145 6,045 (28,266 ) 2,955,924 Securities issued or secured by Non-financial sector entities (**) 658,703 10,779 (88,692 ) 580,790 Others 205,143 1,486 (1,776 ) 204,853 Ps. 8,329,396 Ps. 41,167 Ps. (146,014 ) Ps. 8,224,549 Total Debt Securities Ps. 17,934,949 Ps. 62,525 Ps. (334,741 ) Ps. 17,662,733 Equity Instruments In Colombian Pesos Corporate Stock Ps. 239,502 Ps. 485,935 Ps. (82 ) Ps. 725,355 In foreign currency Corporate Stock 393 4,031 - 4,424 Total Equity Securities Ps. 239,895 Ps. 489,966 Ps. (82 ) Ps. 729,779 Total investments available-for-sale and unrealized gain (loss) in Other comprehensive income Ps. 18,174,844 Ps. 552,491 Ps. (334,823 ) Ps. 18,392,512 (*) Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from one issuer were classified as impaired. (**) Cost is net of Ps. 72,110 for impairment recognized in statement of income in impairment loss on financial asset line from the debt investment securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries which filed for bankruptcy protection on June, 2016.
Disclosure of equity instruments available for sale [text block]	The details of available-for-sale equity instruments as of December 31, 2017 and 2016 are as follows. Entity (*) December 31, December 31, Empresa de Energia de Bogota S.A. E.S.P. Ps. 659,208 Ps. 592,142 Gas Natural S.A. ESP 49,998 74,624 Mineros S.A. 56,546 42,913 Bolsa de Valores de Colombia S.A. 52,064 15,603 Master Card 5,634 3,874 Others 583 623 Total Ps. 824,033 Ps. 729,779 (*) These investments in equity securities have been designated as available-for-sale sale taking into account that they represent strategic investments for Grupo Aval and therefore, they are not expected to be sold in a foreseeable future.
Disclosure of detailed information about available for sale debt securities used in collateral repo operations [Text Block]	The following is a list of available-for-sale debt securities that are being used as collateral in repo operations, pledged as collateral in transactions with financial instruments, or pledged to third parties as collateral to secure financial obligations with other banks (See note 21). December 31, December 31, Pledged as collateral in money market operations Securities issued or secured by Foreign Governments Ps. 148,816 Ps. 299,560 Securities issued or secured by Colombian Government 2,215,568 4,174,184 Securities issued or secured by Non-financial sector entities - 3,020 Securities issued or secured by other Colombian Government entities 133,701 83,076 Securities issued or secured by other financial entities 38,536 35,809 Others 50,273 39,335 Ps. 2,586,894 Ps. 4,634,984 Pledged as collateral in operations with derivative instruments Securities issued or secured by Colombian Government 77,736 151,343 Ps. 77,736 Ps. 151,343 Pledged as collateral to special entities such as CRCC, BR and BVC (*) Securities issued or secured by Colombian Government 291,878 - Ps. 291,878 Ps. - Other collaterals Securities issued or secured by Central Banks Ps. 158,951 Ps. - 158,951 - Ps. 3,115,459 Ps. 4,786,327 (*) Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valor es de Colombia – BVC
Disclosure of debt instruments [text block]	A summary of the maturity dates of available-for-sale debt securities follows: December 31, December 31, Fair Value Up to 1 month Ps. 495,315 Ps. 881,951 More than 1 month and no more than 3 months 601,654 313,386 More than 3 months and no more than 1 year 2,236,367 2,204,219 More than 1 year and no more than 5 years 11,436,614 9,544,836 More than 5 years and no more than 10 years 2,792,063 4,345,791 More than 10 years 228,114 372,550 Ps. 17,790,127 Ps. 17,662,733 Cost Up to 1 month Ps. 495,284 Ps. 880,907 More than 1 month and no more than 3 months 601,156 313,048 More than 3 months and no more than 1 year 2,235,214 2,199,014 More than 1 year and no more than 5 years 11,437,189 9,669,504 More than 5 years and no more than 10 years 2,768,870 4,483,043 More than 10 years 240,140 389,433 Ps. 17,777,853 Ps. 17,934,949

HELD-TO-MATURITY INVESTMENTS (T

HELD-TO-MATURITY INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Held-To-Maturity Investments [Abstract]
Disclosure of detailed information about investments held to maturity [Text Block]	The breakdown of held-to-maturity investments as of December 31, 2017 and 2016 as follows: December 31, 2017 December 31, 2016 Debt securities In Colombian Pesos Securities issued or secured by Colombian Government Ps. 424 Ps. 1,829 Securities issued or secured by other Colombian Government entities 2,839,286 2,484,078 Securities issued or secured by other financial entities 8,635 58,887 Ps. 2,848,345 Ps. 2,544,794 In foreign currency Securities issued or secured by Foreign Governments 26,864 24,152 Securities issued or secured by other financial entities 23,830 - Others - 1,540 Ps. 50,694 Ps. 25,692 Total held-to-maturity investments Ps. 2,899,039 Ps. 2,570,486
Disclosure of detailed information about investments held to maturity [Text Block]	The following is a summary of held-to-maturity securities financial assets by maturity dates: December 31, 2017 December 31, 2016 Up to 1 month Ps. 722,026 Ps. 695,201 More than 1 month and no more than 3 months 38,071 27,608 More than 3 months and no more than 1 year 2,133,344 1,842,566 More than 1 year and no more than 5 years 5,598 4,938 More than 5 years and no more than 10 years - - More than 10 years - 173 Ps. 2,899,039 Ps. 2,570,486

DERIVATIVE INSTRUMENTS AND HE54

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Tables)	12 Months Ended
	Dec. 31, 2017
Discloser Of Derivative Instruments and Hedge Accounting [Abstract]
Disclosure of detailed information about derivative financial instruments for trading [Text Block]	Held-for-trading derivative financial instruments comprise the following: December 31, 2017 December 31, 2016 Item Notional Amount Fair Value Notional Amount Fair Value Assets Forward contracts Foreign currency to buy Ps. 6,126,920 Ps. 60,799 Ps. 5,255,735 Ps. 118,568 Foreign currency to sell 10,769180 163,156 10,206,225 272,803 Debt securities to buy 191,500 357 - - Debt securities to sell 430,035 374 - - Subtotal Ps. 17,517,635 Ps. 224,686 Ps. 15,461,960 Ps. 391,371 Swap Cross currency 1,534,252 33,104 1,288,048 44,593 Interest rate 6,855,627 52,970 6,021,481 39,780 Subtotal Ps. 8,389,879 Ps. 86,074 Ps. 7,309,529 Ps. 84,373 Futures Contracts Foreign currency to buy 1,192,880 - 1,069,003 - Foreign currency to sell 2,873,592 - 1,198,784 - Debt securities to buy 408,000 - Debt securities to sell 84,000 - - - Subtotal Ps. 4,558,472 Ps. - Ps. 2,267,787 Ps. - Options Contracts Foreign currency to buy - - 563,522 10,769 Interest rate to buy - - 31,550 152 Debt securities to buy 1,369,942 17,632 739,512 15,544 Debt securities to sell - - Subtotal 1,369,942 17,632 1,334,584 26,465 Total Assets Ps. 31,835,928 Ps. 328,392 Ps. 26,373,860 Ps. 502,209 Liabilities Forward contracts Foreign currency to buy Ps. 9,027,166 Ps. 120,083 Ps. 9,286,812 Ps. 247,967 Sale of Foreign currency 5,547,955 24,489 7,039,126 160,936 Debt securities to buy 185,000 171 Debt securities to sell 437,100 936 597,500 1,492 Subtotal Ps. 15,197,221 Ps. 145,679 Ps. 16,923,438 Ps. 410,395 Swap Cross currency 1,574,121 79,263 1,771,324 164,906 Interest rate 5,884,551 40,693 4,210,766 25,827 Subtotal Ps. 7,458,672 Ps. 119,956 Ps. 5,982,090 Ps. 190,733 Futures Contracts Foreign currency to buy 4,508,630 - 1,995,604 - Foreign currency to sell 815,407 - 409,747 - Subtotal Ps. 5,324,037 Ps. - Ps. 2,405,351 Ps. - Options Contracts Foreign currency to buy - - - - Foreign currency to sell Ps. 1,035,376 Ps. 33,030 Ps. 447,818 Ps. 19,960 Debt securities to sell - - 556,310 19,607 Subtotal Ps. 1,035,376 Ps. 33,030 Ps. 1,004,128 Ps. 39,567 Total Liabilities Ps. 29,015,306 Ps. 298,665 Ps. 26,315,007 Ps. 640,695
Disclosure of detailed information about derivative financial instruments for hedging [Text Block]	Derivative Financial Instruments for hedging purposes comprise the following: December 31, 2017 December 31, 2016 Item Notional Amount Fair Value Notional Amount Fair Value Assets Forward contracts Foreign currency to buy Ps. 11,164 Ps. 1 Ps. 474,412 Ps. 3,914 Foreign currency to sale 2,589,739 55,260 3,735,363 124,565 Subtotal Ps. 2,600,903 Ps. 55,261 Ps. 4,209,775 Ps. 128,479 Futures Contracts Foreign currency to buy 29,840 - 150,036 - Foreign currency to sell 1,602,408 - 973,730 - Subtotal 1,632,248 - 1,123,766 - Total Assets Ps. 4,233,151 Ps. 55,261 Ps. 5,333,541 Ps. 128,479 Liabilities Forward contracts Foreign currency to buy 729,692 5,455 967,702 28,297 Foreign currency to sell 1,106,975 8,009 1,536,849 15,139 Subtotal Ps. 1,836,667 Ps. 13,464 Ps. 2,504,551 Ps. 43,436 Future Contracts Foreign currency to buy 387,920 - 363,086 - Foreign currency to sell 1,153,316 - 190,545 - Subtotal Ps. 1,541,236 Ps. - Ps. 553,631 Ps. - Total Liabilities Ps. 3,377,903 Ps. 13,464 Ps. 3,058,182 Ps. 43,436
Disclosure of detailed information about fluctuation in foreign exchange rates [Text Block]	Changes in the fluctuation of the Colombian peso against the U.S. dollar are as follows: Date Value of USD 1 Variation in pesos December 31, 2015 3,149.47 757.01 December 31, 2016 3,000.71 (148.76 ) December 31, 2017 2,984.00 (16.71 )
Disclosure of detailed information about hedge in foreign currency equity investments [Text Block]	According to information described above, the following table contains details of hedging operations carried out to cover foreign denominated equity investments. The analysis is presented gross of taxes: December 31, 2017 Thousands of USD Ps. millions Detail of investment Investment Amount of Amount of Cumulative Exchange Exchange Net OCI Leasing Bogotá Panamá 3,781,475 (2,067,100 ) (1,703,009 ) 3,065,281 (1,045,872 ) (2,155,488 ) (136,079 ) Other subsidiaries and branches Banco de Bogotá (2) 113,909 - (112,049 ) 92,891 - (90,431 ) 2,460 Occidental Bank Barbados 26,396 (26,396 ) - 18,740 (18,740 ) - - Banco de Occidente Panamá 25,044 (25,044 ) - 29,979 (29,979 ) - - Sociedad Portuaria El Cayao S.A. E.S.P. (3) 25,000 (25,000 ) - 2,207 (2,207 ) - - Gases del Pacífico S.A.C. (3) 10,214 (10,214 ) - 902 (902 ) - - Gas Natural de Lima y Callao S.A.C. – Calidda (3) 15,895 (15,895 ) - 1,272 (1,272 ) - - Total 3,997,933 (2,169,649 ) (1,815,058 ) 3,211,272 (1,098,972 ) (2,245,919 ) (133,619 ) (1) Includes exchange difference hedged (2) Includes Banco de Bogotá Panamá, Banco Bogotá Finance, Ficentro and contributions of foreign branches in Miami, New York and Nassau. (3) Includes only a portion of this investments hedged December 31, 2016 Thousands of USD Ps. Millions Detail of investment Investment Amount of Amount of Cumulative Exchange Exchange Net OCI Leasing Bogotá Panamá 3,436,658 (2,074,100 ) (1,346,889 ) 3,115,527 (1,080,737 ) (2,171,234 ) (136,444 ) Other subsidiaries and branches Banco de Bogotá (2) 100,827 - (100,260 ) 94,139 - (91,517 ) 2,622 Occidental Bank Barbados 25,401 (25,401 ) - 19,176 (19,176 ) - - Banco de Occidente Panamá 21,699 (21,699 ) - 29,627 (29,627 ) - - Total 3,584,585 (2,121,200 ) (1,447,149 ) 3,258,469 (1,129,540 ) (2,262,751 ) (133,822 ) (1) Includes only exposure hedged under hedge accounting. (2) Includes Banco de Bogotá Panamá, Banco Bogotá Finance, Ficentro and contributions of foreign branches in Miami, New York and Nassau.
Disclosure of detailed information about hedges [text block]	The following is the summary of Promigas and its subsidiaries open cash flow hedges: December 31, December 31, Income in U.S. dollars forecasted 41,614 142,731 Notional amount contracts forward U.S. dollars 41,614 99,912 % hedged 100 % 70 % Fair value in Colombian pesos 4,303 4,824 # of contracts 468 892
Disclosure of analysis of other comprehensive income by item [text block]	The movement of the accumulated OCI account related to cash flow hedges in Colombian pesos during the years ended on December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year 6,210 (11,757 ) (26,790 ) Changes in the fair value of the hedge forward contracts 24,506 12,930 31,575 Reclassified to profit or loss (26,846 ) 5,037 (16,542 ) Balance at the end of the year Ps. 3,870 Ps. 6,210 Ps. (11,757 )

LOANS (Tables)

LOANS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of loans and receivables [Abstract]
Disclosure of financial assets [text block]	Loans are recorded at amortized cost on the statement of financial position and are classified as commercial, consumer, mortgages, and microcredit. Due to the significance of the financial leasing portfolio for Grupo Aval, these amounts are also presented in all the tables in the note of credit risks for disclosure purposes: December 31, 2017 Portfolio segment Balance in Statement of Leasing presentation Balance according to Commercial Ps. 99,428,894 Ps. (9,892,400 ) Ps. 89,536,494 Consumer 50,382,895 (226,764 ) 50,156,131 Residential mortgage 16,151,299 (1,047,766 ) 15,103,533 Microcredit 409,688 - 409,688 Financial Leasing - 11,166,930 11,166,930 Total portfolio Ps. 166,372,776 Ps. - Ps. 166,372,776 December 31, 2016 Portfolio segment Balance in Statement of Leasing presentation Balance according to Commercial Ps. 93,149,211 Ps. (9,958,095 ) Ps. 83,191,116 Consumer 46,927,997 (215,608 ) 46,712,389 Residential mortgage 14,683,537 (902,104 ) 13,781,433 Microcredit 399,431 - 399,431 Financial Leasing - 11,075,807 11,075,807 Total portfolio Ps. 155,160,176 Ps. - Ps. 155,160,176
Disclosure of detailed information about distribution of the credit portfolio [Text Block]	The distribution of the credit portfolio of Grupo Aval by product is shown as follows: December 31, 2017 December 31, 2016 General purpose loans Ps. 64,153,372 Ps. 60,561,432 Personal loans 30,553,566 28,308,406 Working capital loans 14,723,490 15,524,372 Mortgages 15,103,533 13,781,433 Credit Cards 13,846,823 12,781,182 Commercial financial leases 9,892,402 9,958,096 Consumer financial leases 226,764 215,608 Automobile and vehicle loans 5,896,640 5,736,357 Interbank &; Overnight Funds 7,279,047 3,569,587 Loans funded by development banks 2,713,818 2,829,091 Housing leases 1,047,766 902,104 Overdrafts 525,867 593,077 Microcredit 409,688 399,431 Gross balance of Financial Assets of credit portfolio 166,372,776 155,160,176 Allowance for impairment of financial assets from the loan portfolio (5,618,481 ) (4,261,444 ) Net balance of Financial Assets to credit portfolio Ps. 160,754,295 Ps. 150,898,732
Disclosure of detailed information about reconciliation of changes in allowance account for credit losses of financial assets [Text Block]	The movement of the impairment provision of the financial assets of the credit portfolio during the years ended December 31, 2017, 2016 and 2015 is as follows Commercial Consumer Mortgage Microcredit Financial Total Balance as of December 31, 2014 Ps. 1,448,771 Ps. 1,404,743 Ps. 70,709 Ps. 47,808 Ps. 185,772 Ps. 3,157,803 Allowance of the period charged to profit or loss 1,310,679 2,182,141 42,313 37,506 214,797 3,787,436 Recovery of provisions with partial payment to profit or loss (663,931 ) (916,030 ) (24,797 ) (14,505 ) (97,012 ) (1,716,275 ) Charge-offs of the year (198,727 ) (1,304,058 ) (14,160 ) (33,096 ) (86,405 ) (1,636,446 ) Exchange differences (217,563 ) 312,351 21,037 11,493 (1,512 ) 125,806 Balance as of December 31, 2015 Ps. 1,679,229 Ps. 1,679,147 Ps. 95,102 Ps. 49,206 Ps. 215,640 Ps. 3,718,324 Allowance of the period charged to profit or loss 1,522,077 3,088,950 75,059 72,917 225,498 4,984,501 Recovery of provisions with partial payment to profit or loss (857,465 ) (976,258 ) (37,863 ) (18,119 ) (162,033 ) (2,051,738 ) Charge-offs of the year (495,326 ) (1,759,896 ) (15,828 ) (28,703 ) (55,234 ) (2,354,987 ) Exchange differences (33,571 ) (9,118 ) 7,630 (12,164 ) 12,567 (34,656 ) Balance as of December 31, 2016 Ps. 1,814,944 Ps. 2,022,825 Ps. 124,100 Ps. 63,137 Ps. 236,438 Ps. 4,261,444 Allowance of the period charged to profit or loss 1,825,905 3,403,092 81,189 64,627 222,043 5,596,856 Recovery of provisions with partial payment to profit or loss (584,091 ) (780,874 ) (28,051 ) (29,237 ) (112,671 ) (1,534,924 ) Charge-offs of the year (400,653 ) (2,165,857 ) (45,918 ) (24,360 ) (46,754 ) (2,683,542 ) Sale of portfolio - (24,503 ) - - - (24,503 ) Exchange differences 3,217 2,108 (438 ) - (1,737 ) 3,150 Balance as of December 31, 2017 Ps. 2,659,322 Ps. 2,456,791 Ps. 130,882 Ps. 74,167 Ps. 297,319 Ps. 5,618,481
Disclosure of impairment of assets [text block]	The detailed information of credit risk impairment provisions accrued as of December 31, 2017 and 2016, taking into account how they were determined individually for loans above of Ps. 2,000 and collectively for other credits. Loans individually assessed for impairment lower than Ps. 2,000 are considered in the allowances for each type of credit. December 31, 2017 Impairment provision: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually Ps. 1,363,315 Ps. 70 Ps. 781 Ps. - Ps. 126,867 Ps. 1,491,033 Loans assessed collectively 1,296,007 2,456,721 130,101 74,167 170,452 4,127,448 Total impairment provision Ps. 2,659,322 Ps. 2,456,791 Ps. 130,882 Ps. 74,167 Ps. 297,319 Ps. 5,618,481 Gross balance of financial assets for credit portfolio: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually (1) Ps. 49,846,935 Ps. 51,768 Ps. 14,934 Ps. - Ps. 5,444,122 Ps. 55,357,759 Loans assessed collectively 39,689,559 50,104,363 15,088,599 409,688 5,722,808 111,015,017 Total gross investment value of portfolio Ps. 89,536,494 Ps. 50,156,131 Ps. 15,103,533 Ps. 409,688 Ps. 11,166,930 Ps. 166,372,776 December 31, 2016 Impairment provision: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually Ps. 724,522 Ps. 47 Ps. 827 Ps. - Ps. 74,098 Ps. 799,494 Loans assessed collectively 1,090,422 2,022,778 123,273 63,137 162,340 3,461,950 Total impairment provision Ps. 1,814,944 Ps. 2,022,825 Ps. 124,100 Ps. 63,137 Ps. 236,438 Ps. 4,261,444 Gross balance of financial assets for credit portfolio: Commercial Consumer Mortgage Microcredit Financial Total Loans assessed individually (1) Ps. 48,565,393 Ps. 92,410 Ps. 8,506 Ps. - Ps. 5,113,843 Ps. 53,780,152 Loans assessed collectively 34,625,723 46,619,979 13,772,927 399,431 5,961,964 101,380,024 Total gross investment value of portfolio Ps. 83,191,116 Ps. 46,712,389 Ps. 13,781,433 Ps. 399,431 Ps. 11,075,807 Ps. 155,160,176 (1) Loans individually evaluated for impairment that are not considered impaired, additionally are evaluated collectively for impairment according to historical losses experience adjusted to reflect current economic conditions.
Disclosure of detailed information about portfolio of loans assessed individually for impairment [Text Block]	The detailed information as of December 31, 2017 and 2016 is as follows December 31, 2017 Gross Amount Registered Collateral Guarantees Allowance Recognized Without recognized provision Commercial Ps. 180,527 Ps. 242,366 Ps. - Financial Leasing 186,725 564,540 - Subtotal Ps. 367,252 Ps. 806,906 Ps. - With recognized provision Commercial Ps. 3,972,638 Ps. 228,667 Ps. 1,363,315 Consumer 233 - 70 Residential Mortgage 1,907 - 781 Financial Leasing 599,747 161,309 126,867 Subtotal Ps. 4,574,525 Ps. 389,976 Ps. 1,491,033 Totals Commercial 4,153,165 471,033 1,363,315 Consumer 233 - 70 Residential Mortgage 1,907 - 781 Financial Leasing 786,472 725,849 126,867 Total Ps. 4,941,777 Ps. 1,196,882 Ps. 1,491,033 December 31, 2016 Gross Amount Collateral Allowance Without recognized provision Commercial Ps. 262,831 Ps. 208,604 Ps. - Financial Leasing 138,513 484,339 - Subtotal Ps. 401,344 Ps. 692,943 Ps. - With recognized provision Commercial Ps. 3,156,154 Ps. 221,203 Ps. 724,522 Consumer 141 - 47 Residential Mortgage 1,907 - 827 Financial Leasing 327,755 165,221 74,098 Subtotal Ps. 3,485,957 Ps. 386,424 Ps. 799,494 Totals Commercial 3,418,985 429,807 724,522 Consumer 141 - 47 Residential Mortgage 1,907 - 827 Financial Leasing 466,268 649,560 74,098 Total Ps. 3,887,301 Ps. 1,079,367 Ps. 799,494
Disclosure of detailed information about distribution of loans portfolio by maturity period [Text Block]	The distribution of loan portfolio of Grupo Aval by maturity period is as follows: December 31, 2017 Up to 1 From 1 to 3 From 3 to More than Total Commercial Ps. 44,888,149 Ps. 19,651,034 Ps. 11,088,553 Ps. 13,908,758 Ps. 89,536,494 Consumer 16,240,350 11,146,916 8,809,557 13,959,308 50,156,131 Residential Mortgage 469,702 785,736 857,039 12,991,056 15,103,533 Microcredit 209,364 178,052 17,707 4,565 409,688 Financial Leasing 2,159,750 2,889,713 2,496,769 3,620,698 11,166,930 Total gross credit portfolio Ps. 63,967,315 Ps. 34,651,451 Ps. 23,269,625 Ps. 44,484,385 Ps. 166,372,776 December 31, 2016 Up to 1 From 1 to 3 From 3 to More than Total Commercial Ps. 36,982,196 Ps. 19,083,900 Ps. 10,957,767 Ps. 16,167,253 Ps. 83,191,116 Consumer 15,207,864 10,928,357 8,188,856 12,387,312 46,712,389 Residential Mortgage 396,964 706,364 732,454 11,945,651 13,781,433 Microcredit 166,719 208,759 19,610 4,343 399,431 Financial Leasing 2,571,103 2,775,490 2,192,804 3,536,410 11,075,807 Total gross credit portfolio Ps. 55,324,846 Ps. 33,702,870 Ps. 22,091,491 Ps. 44,040,969 Ps. 155,160,176
Disclosure of detailed information about classification of loan portfolio by type of currency [Text Block]	The classification of loan portfolio by type of currency is as follows: December 31, 2017 Colombian Pesos Foreign Currency Total Commercial Ps. 56,516,054 Ps. 33,020,440 Ps. 89,536,494 Consumer 32,822,355 17,333,776 50,156,131 Residential Mortgage 5,674,639 9,428,894 15,103,533 Microcredit 409,688 - 409,688 Financial Leasing 9,132,401 2,034,529 11,166,930 Total gross credit portfolio Ps. 104,555,137 Ps. 61,817,639 Ps. 166,372,776 December 31, 2016 Colombian Pesos Foreign Currency Total Commercial Ps. 54,026,331 Ps. 29,164,785 Ps. 83,191,116 Consumer 30,452,658 16,259,731 46,712,389 Residential Mortgage 4,822,806 8,958,627 13,781,433 Microcredit 399,431 - 399,431 Financial Leasing 8,953,491 2,122,316 11,075,807 Total gross credit portfolio Ps. 98,654,717 Ps. 56,505,459 Ps. 155,160,176
Disclosure of detailed information about reconciliation of undiscounted lease payments to net investment in finance lease [Text Block]	As of December 31, 2017 and 2016 the following table shows the reconciliation between gross investment in financial leasing and the present value of minimum payments to be received in these dates: December December Total gross rent payments receivable Ps. 16,445,998 Ps. 17,071,858 Less amounts representing running costs (such as taxes, maintenance, insurances ,etc.,) (225 ) (2,527 ) Plus Estimated residual amount of assets given for rental (without guarantee) 21,673 21,162 Gross investment in contracts of financial leasing 16,467,446 17,090,493 Less unrealized financial income (5,300,516 ) (6,014,686 ) Net investment in contracts of financial leasing 11,166,930 11,075,807 Impairment of net investment in financial leasing Ps. (297,319 ) Ps. (236,438 )
Disclosure of detailed information about gross investment and net investment in financial leasing contracts receivable [Text Block]	The detailed information of gross investment and net investment in financial leasing contracts receivable as of December 31, 2017 and 2016 in each period is as follows: December 31, 2017 Gross investment Net investment Up to 1 year Ps. 2,147,421 Ps. 1,614,889 From 1 to 5 years 6,428,242 4,986,723 More than 5 years 7,891,783 4,565,318 Total Ps. 16,467,446 Ps. 11,166,930 December 31, 2016 Gross investment Net investment Up to 1 year Ps. 2,711,147 Ps. 2,128,441 From 1 to 5 years 6,375,267 4,798,364 More than 5 years 8,004,079 4,149,002 Total Ps. 17,090,493 Ps. 11,075,807

OTHER ACCOUNTS RECEIVABLE, NET

OTHER ACCOUNTS RECEIVABLE, NET (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of other accounts receivables [Line Items]
Disclosure Of Detailed Information About Other Accounts Receivables [Text Block]	The detailed information of other accounts receivable as of December 31, 2017 and 2016 is as follows: December 31, December 31, Accounts receivable for goods and services sales in Non-financial sector companies Ps. 1,070,936 Ps. 1,066,628 Financial assets in concession contract at amortized cost ( See note 16) 786,018 203,241 Credit card compensations and network compensation 426,090 249,430 Fees, services and advances 258,850 272,488 Dormant customer deposits ICETEX (1) 256,806 237,034 Payment in advance 228,765 262,473 Debtors 224,340 178,785 Commissions 186,646 131,867 Transfers in process 185,634 166,153 Deposits 142,168 138,520 Payment in advance to supplier's contract 117,858 39,309 Holding and parent establishment 114,513 230,950 Transfers to the National Treasury 58,042 52,351 Storage services 43,767 41,282 Quota shares retirement pensions 28,485 30,396 Claims to insurance companies 14,450 19,201 Dividends 3,561 16,263 Deductible taxes 11,961 15,611 Promissory sellers 15,144 11,661 Payment in advance for industry and trade taxes 13,392 11,553 Others 278,708 344,476 Gross balance of other accounts receivable 4,466,134 3,719,672 Impairment allowance (226,862 ) (195,078 ) Other accounts receivable, net Ps. 4,239,272 Ps. 3,524,594 (1) Pursuant to Colombian Law number 1777 of 2016, financial institutions in Colombia since August 1, 2016, must transfer the funds from clients’ in dormant customer deposits to a special fund as a loan to a Colombian Government entity denominated “ICETEX”, and classified as “Other accounts receivable” given it is permanently deemed refundable to any particular client. This Government entity Fund is responsible for managing the monies funds with the commitment to return them at the time the bank customer account holder requests them. Dormant client’s customer deposits are accounts of savings or current accounts that exceed the 322 UVR (Real Value Units) equivalent to Ps. 81,663 pesos, on which no deposit, withdrawal, transfer or, in general, debit or credit movements have been made during an uninterrupted period of three years.
Disclosure Of Detailed Information About Movements Of Allowance [Text Block]	Roll-forward on the allowance to accounts receivable for the years ended December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 195,078 Ps. 194,450 Ps. 222,385 Provision charged to profit or loss 98,024 105,942 96,775 Recovery for partial payments from the clients (18,383 ) (32,514 ) (40,185 ) Charge-offs (48,171 ) (72,120 ) (85,880 ) Exchange gains (losses) in foreign currency 314 (680 ) 1,355 Balance at the end of the year Ps. 226,862 Ps. 195,078 Ps. 194,450

NON-CURRENT ASSETS HELD FOR S57

NON-CURRENT ASSETS HELD FOR SALE (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of non-current assets held for sale [Abstract]
Disclosure Of Detailed Information About Movements Of Non-Current Assets Held For Sale [Text Block]	The movement of the non-current assets held for sale during the years ended December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 259,527 Ps. 199,475 Ps. 211,247 Additions 89,216 236,632 93,698 Assets sold (78,784 ) (130,784 ) (104,940 ) Charge-offs - - (5,786 ) Changes in fair value (37,818 ) (34,572 ) (12,159 ) Reclassifications (1) (134,795 ) (5,631 ) (24,901 ) Exchange gains in foreign currency 4,036 (5,593 ) 42,316 Balance at year end Ps. 101,382 Ps. 259,527 Ps. 199,475 (1) Includes reclassifications to: I) II) III)
Disclosure of non-current assets or disposal groups classified as held for sale [text block]	Following is the detail of the non-current assets held for sale: December 31, December 31, Foreclosed assets Movable property Ps. 8,523 Ps. 103,569 Residential real estate 31,666 36,368 Other real estate 37,061 38,080 Ps. 77,250 Ps. 178,017 Assets received from leasing agreements Machinery and equipment 15,640 25,035 Vehicles 1,623 6,320 Real estate 1,963 27,208 Ps. 19,226 Ps. 58,563 Other non-current assets held for sale Lands - 8,396 Real estate 982 - Other 3,924 14,551 4,906 22,947 Balance Ps. 101,382 Ps. 259,527
Disclosure Of Detailed Information About Liabilities With Groups Of Assets Held For Sale [Text Block]	Following is the detail of the associated liabilities to assets held for sale: December 31, 2017 December 31, 2016 Commercial accounts payable Ps. 18,382 Ps. 13,884 Total Ps. 18,382 Ps. 13,884

INVESTMENTS IN ASSOCIATES AND58

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of investments in associates and joint ventures [Line Items]
Disclosure Of Detailed Information about Investment In Associates And Joint Ventures [Text Block]	The detail of the investments in associates and joint ventures is as follows: December 31, December 31, Associates Ps. 925,823 Ps. 865,410 Joint ventures 117,191 281,237 Total Ps. 1,043,014 Ps. 1,146,647
Disclosure of interests in associates [text block]	The following table shows the balances of each investment in associates and joint ventures as of December 31, 2017 and 2016, Grupo Aval voting right percentage in those entities: December 31, 2017 December 31, 2016 Ownership Book Ownership Book Associates A.C.H Colombia S.A. 34 % Ps. 12,357 34 % Ps. 10,467 Redeban Multicolor S.A. 20 % 19,529 20 % 18,421 Credibanco (*) 25 % 196,071 25 % 192,893 Aerocali S.A. 50 % 17,633 50 % 24,971 Colombiana de Extrusión S.A. Extrucol 30 % 11,476 30 % 11,354 Concesionaria Tibitoc S.A. 33 % 20,165 33 % 20,209 Metrex S.A. 18 % 2,559 18 % 2,239 C.I. Acepalma S.A. (**) 11 % 5,625 11 % 4,367 Gases del Caribe S.A. E.S.P. 31 % 269,739 31 % 218,432 Gas Natural de Lima y Callao S.A. -Calidda S.A. 40 % 363,139 40 % 354,822 Energía Eficiente S.A. 39 % 6,927 39 % 6,678 Concentra Inteligencia en energía S.A.S 24 % 603 24 % 557 Ps. 925,823 Ps. 865,410
Disclosure of interests in joint arrangements [text block]	December 31, 2017 December 31, 2016 Ownership Book Ownership Book Joint ventures Cfc Sk Eldorado Latam Advisory Company S.A.S (1) 50 % 345 50 % 258 Cfc Sk El Dorado Latam Management Company Ltd (1) 50 % 4,568 50 % 2,993 Cfc Sk El Dorado Latam Capital Partner Ltd (1) 50 % 495 50 % 472 Cfc Sk El Dorado Latam Fund L.P. (1) - - 50 % 12,395 Concesionaria Ruta Del Sol S.A.S. (2) 33 % 111,783 33 % 252,474 Concesionaria Víal Del Pacífico (3) - - 50 % 1,479 Concesionaria Nueva Vía Al Mar (4) - - 60 % 11,166 Ps. 117,191 Ps. 281,237 (*) Since November 30, 2016, Grupo Aval has significant influence on Credibanco. Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate. (**) Grupo Aval has significant influence over C.I. Acepalma S.A. due to its participation in the Board of Directors.
Disclosure of detailed information about movement of investments in associates and joint ventures accounts [Text Block]	A roll-forward of investments in associates and joint ventures accounts is shown below for the years ended at December 31, 2017, 2016 and 2015: Associates December 31, December 31, December 31, Balance at the beginning of the year Ps. 865,410 Ps. 645,377 Ps. 540,082 Acquisitions - 16 - Gain in non-monetary transactions (*) - 195,514 - Participation in the profit or loss of the period 170,349 147,867 121,563 Participation in Other Comprehensive Income 1,135 (17,949 ) 30,426 Dividends received (107,812 ) (96,375 ) (39,188 ) Capitalization reductions - (4,746 ) Allowance for Impairment - (4,027 ) - Reclassifications - - (6,524 ) Exchange difference (3,259 ) (267 ) (982 ) Year-end balance Ps. 925,823 Ps. 865,410 Ps. 645,377 (*) Since November 30, 2016, Grupo Aval has significant influence on Credibanco. On August 26, 2016 Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate. Joint ventures December 31, December 31, December 31, Balance at the beginning of the year Ps. 281,237 Ps. 282,222 Ps. 177,103 Participation in the period profit or loss 1,615 (7,102 ) 108,835 Participation in Other Comprehensive Income (7 ) (2,112 ) 1,538 Dividends received - - (6,460 ) Capitalization 87 17,282 - Allowance for Impairment (*) (140,691 ) (5,892 ) - Transfers / Reclassification (12,405 ) (3,569 ) 1,206 Exchange difference - 408 - Balance acquired in business combination (12,645 ) - - Year-end balance Ps. 117,191 Ps. 281,237 Ps. 282,222 (*) Impairment of the investment in the Concesionaria Conjunto Ruta del Sol S.A.S joint businesses (CRDS).
Disclosure of associates [text block]	The condensed financial information of the associates and joint ventures is as follows: Associates December 31, 2017 Assets Liabilities Equity Income Expenses Net A.C.H. Colombia S.A. Ps. 56,670 Ps. 20,119 Ps. 36,551 Ps. 69,120 Ps. 54,746 Ps. 14,374 Redeban Multicolor S.A. 177,667 81,001 96,666 160,470 149,902 10,568 Credibanco 253,991 84,294 169,697 207,592 180,422 27,170 Aerocali S.A. 133,977 99,008 34,969 117,169 100,900 16,269 Colombiana de Extrusión S.A. Extrucol 68,059 29,807 38,252 65,870 62,201 3,669 Concesionaria Tibitoc S.A. 79,566 19,069 60,497 47,125 34,003 13,122 Metrex S.A. 38,933 24,726 14,207 47,763 43,003 4,760 C.I. Acepalma 290,406 240,547 49,859 798,782 789,925 8,857 Gases del Caribe S.A. 2,363,464 1,481,320 882,144 1,577,041 1,343,286 233,755 Cálidda S.A. 2,441,398 1,536,738 904,660 1,575,804 1,402,709 173,095 Concentra Inteligencia en energía S.A.S 2,331 231 2,100 1,634 1,491 143 Energía Eficiente S.A. 40,853 23,142 17,711 92,170 89,709 2,461 Ps. 5,947,315 Ps. 3,640,002 Ps. 2,307,313 Ps. 4,760,540 Ps. 4,252,297 Ps. 508,243 December 31, 2016 Assets Liabilities Equity Income Expenses Net A.C.H. Colombia S.A. Ps. 48,243 Ps. 17,282 Ps. 30,961 Ps. 59,991 Ps. 47,275 Ps. 12,716 Redeban Multicolor S.A. 161,093 69,912 91,181 132,626 127,020 5,606 Credibanco 365,559 212,085 153,474 203,214 184,342 18,872 Aerocali S.A. 146,783 96,841 49,942 130,743 104,850 25,893 Colombiana de Extrusión S.A. Extrucol 59,338 20,148 39,190 79,876 67,585 4,560 Concesionaria Tibitoc S.A. 88,521 27,894 60,627 53,212 37,063 16,149 Metrex S.A. 28,604 16,162 12,442 43,997 41,058 2,939 C.I. Acepalma 211,211 172,455 38,756 652,528 645,524 7,004 Gases del Caribe S.A. 2,197,142 1,460,303 736,838 1,818,142 1,627,786 190,356 Cálidda S.A. 2,230,186 1,343,129 887,057 1,630,979 1,462,514 168,465 Concentra Inteligencia en energía S.A.S 2,092 165 1,927 1,670 1,196 474 Energía Eficiente S.A. 41,643 25,045 16,598 500,311 491,584 8,728 Ps. 5,580,415 Ps. 3,461,421 Ps. 2,118,993 Ps. 5,307,289 Ps. 4,837,797 Ps. 461,762
Disclosure of joint ventures [text block]	Joint ventures December 31, 2017 Assets Liabilities Equity Income Expenses Net CFC SK Eldorado Latam Advisory Company S.A.S Ps. 893 Ps. 204 Ps. 689 Ps. 2,037 Ps. 1,877 Ps. 159 Cfc Sk Eldorado Latam Management Company Ltd. 9,169 34 9,135 3,584 374 3,210 Cfc Sk Eldorado Latam Capital Partners, Ltd. 1,007 16 991 - 131 (131 ) Concesionaria Vial del Pacífico (*) 424,888 424,379 509 113,113 115,567 (2,454 ) Concesionaria Nueva Vía al Mar (*) 188,731 166,955 21,776 26,215 23,049 3,166 Ps. 624,688 Ps. 591,588 Ps. 33,100 Ps. 144,949 Ps. 140,998 Ps. 3,950 (*) As of December 2017, the investment stopped being a Joint Venture and became a controlled investment. (See note 15, this acquisition is considered non-significant). December 31, 2016 Assets Liabilities Equity Income Expenses Net CFC SK Eldorado Latam Advisory Company S.A.S Ps. 1,015 Ps. 499 Ps. 516 Ps. 2,637 Ps. 2,265 Ps. 372 Cfc Sk Eldorado Latam Management Company Ltd. 6,026 39 5,987 3,003 381 2,622 Cfc Sk Eldorado Latam Capital Partners, Ltd. 960 15 945 (20 ) 152 (172 ) Cfc Sk Eldorado Latam Fund L.P. 37,545 12,582 24,963 1,953 9,655 (7,702 ) Concesionaria Ruta del Sol S.A. 3,653,227 2,578,230 1,074,997 1,499,983 1,207,910 292,073 Concesionaria Vial del Pacífico 246,184 243,221 2,963 61,275 61,506 (231 ) Concesionaria Nueva Vía al Mar 122,884 104,274 18,610 27,408 24,337 3,071 Ps. 4,067,841 Ps. 2,938,860 Ps. 1,128,981 Ps. 1,596,239 Ps. 1,306,206 Ps. 290,033

TANGIBLE ASSETS (Tables)

TANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Disclosure of detailed information about property, plant and equipment [text block]	The movement of the carrying value amounts of tangible assets for the years ended on December 31, 2017, 2016 and 2015 is as follows: For own Given in Investment Biological assets Total Cost Balance as of January 1, 2015 Ps. 6,758,740 Ps. 17,111 Ps. 366,742 Ps. 202,399 Ps. 7,344,992 Purchases or capitalized expenses 919,335 1,119 75,458 35,265 1,031,177 Withdrawals / Sales (349,056 ) (7,739 ) (22,945 ) (20,374 ) (400,114 ) Changes in fair value - - 104,769 22,922 127,691 Transfers to/from non-current assets held for sale 15,498 - 14,222 - 29,720 Adjustments for exchange differences 625,076 - - - 625,076 Balance as of December 31, 2015 Ps. 7,969,593 Ps. 10,491 Ps. 538,246 Ps. 240,212 Ps. 8,758,542 Reclassification of bearer plants balance (*) 188,177 - - (188,177 ) - Effects of amendments in accounting policies of bearer plants 29 - - (18,108 ) (18,079 ) Purchases or capitalized expenses 814,194 362 71,268 21,432 907,256 Withdrawals / Sales (367,987 ) (3,806 ) (61,786 ) (20,670 ) (454,249 ) Changes in fair value - - 53,680 14,644 68,324 Transfers to/from non-current assets held for sale (18,704 ) - 11,319 - (7,385 ) Adjustments for exchange differences (138,320 ) - - - (138,320 ) Reclassifications (58,046 ) - (2,539 ) (1,331 ) (61,916 ) Balance as of December 31, 2016 Ps. 8,388,936 Ps. 7,047 Ps. 610,188 Ps. 48,002 Ps. 9,054,173 Purchases or capitalized expenses 470,650 3,102 84,036 24,409 582,197 Withdrawals / Sales (4) (374,606 ) (2,467 ) (28,431 ) (19,775 ) (425,279 ) Changes in fair value - - 46,675 13,503 60,178 Transfers to/from non-current assets held for sale 587 - 101,469 - 102,056 Adjustments for exchange differences (65,404 ) - - - (65,404 ) Reclassifications (3) 77,394 - (30,143 ) - 47,251 Balance as of December 31, 2017 Ps. 8,497,557 Ps. 7,682 Ps. 783,794 Ps. 66,139 Ps. 9,355,172 Accumulated Depreciation: Balance January 1, 2015 Ps. (1,445,970 ) Ps. (9,237 ) Ps. - Ps. - Ps. (1,455,207 ) Depreciation for the year charged to profit or loss (388,271 ) (3,505 ) - - (391,776 ) Withdrawals / Sales 156,830 5,678 - - 162,508 Transfers to/from non-current assets held for sale (364,282 ) - - - (364,282 ) Adjustments for exchange differences (194,653 ) - - - (194,653 ) Balance December 31, 2015 Ps. (2,236,346 ) Ps. (7,064 ) Ps. - Ps. - Ps. (2,243,410 ) IAS 41 Adoption Effect – agriculture (29 ) (29 ) Depreciation for the year charged to profit or loss (454,620 ) (1,232 ) - - (455,852 ) Withdrawals / Sales 126,782 3,413 - - 130,195 Transfers to/from non-current assets held for sale 10,781 - - - 10,781 Adjustments for exchange differences 71,582 - - - 71,582 Reclassification (5,338 ) - - - (5,338 ) Balance December 31, 2016 Ps. (2,487,188 ) Ps. (4,883 ) Ps. - Ps. - Ps. (2,492,071 ) Depreciation of the year charged against profit or loss (463,133 ) (759 ) - - (463,892 ) Withdrawals / Sales (4) 274,804 2,036 - - 276,840 Transfers to/from non-current assets held for sale - - - - - Adjustments for exchange differences 20,881 - - - 20,881 Reclassification (3) (35,531 ) - - - (35,531 ) Balance December 31, 2017 Ps. (2,690,167 ) Ps. (3,606 ) Ps. - Ps. - Ps. (2,693,773 ) Impairment losses: Balance as of January 1, 2015 Ps. (2,726 ) Ps. (326 ) Ps. - Ps. - Ps. (3,052 ) Year impairment charge 1,709 259 - - 1,968 Balance as of December 31, 2015 (1,017 ) (67 ) - - (1,084 ) Year impairment charge (1,482 ) (21 ) - - (1,503 ) Balance as of December 31, 2016 (2,499 ) (88 ) - - (2,587 ) Withdrawals / Year impairment charge (4,894 ) 88 - - (4,806 ) Balance as of December 31, 2017 Ps. (7,393 ) Ps. - Ps. - Ps. - Ps. (7,393 ) Tangible Assets, net: Balance as of December 31, 2015 Ps. 5,732,230 Ps. 3,360 Ps. 538,246 Ps. 240,212 Ps. 6,514,048 Balance as of December 31, 2016 Ps. 5,899,249 Ps. 2,076 Ps. 610,188 Ps. 48,002 Ps. 6,559,515 Balance as of December 31, 2017 Ps. 5,799,997 Ps. 4,076 Ps. 783,794 Ps. 66,139 Ps. 6,654,006 (*) See note 2.15 (1) Only includes assets for own use diferent than assets given in operating lease (see note 15.2) (2) The total of purchases of investment properties, includes Ps. 8,219 at December 2017 and Ps. 14,658 at December 2016, of assets received in total or partial settlement of the payment obligations of debtors. (3) The total of reclassification of for own use, includes Ps. 3,509 of the business combinations Covimar y Covipacifico (this acquisition is not significant). (4) The total of Withdrawals of for own use, includes Ps. (30,440) of the liquidation of “Consorcio Consol”.
Disclosure of finance lease and operating lease by lessor [text block]	Below is a summary of the minimum lease payments to be received in the next years based on assets given in operating lease to December 31, 2017 and 2016: December 31, December 31, Less than a year Ps. 2,833 Ps. 1,937 More than a year, less than 5 2,435 1,170 Total Ps. 5,268 Ps. 3,107
Disclosure of reconciliation of changes in biological assets [text block]	Following is the detail of the biological assets by type: December 31, December 31, African palm In production (at fair value) Ps. 26,555 Ps. 22,814 Rubber plantations In production (at fair value) 24,158 14,605 Other at fair value (*) 15,426 10,583 Total Ps. 66,139 Ps. 48,002 (*) Includes short-term crops, livestock and fish farming.
Disclosure of income loss from biological assets [text block]	During the years ended on December 31, 2017, 2016 and 2015, Grupo Aval recorded in its statement of income the following: December 31, December 31, December 31, Sales of biological goods Ps. 43,788 Ps. 39,032 Ps. 46,458 Changes in fair value of biological assets 13,503 14,644 22,922 Subtotal 57,291 53,676 69,380 Costs and expenses (37,313 ) (27,067 ) (37,045 ) Depreciation of bearer plants (3,405 ) (2,665 ) - General administration costs and sales (7,278 ) (4,379 ) (2,866 ) Financial costs (4,136 ) (2,285 ) (278 ) Subtotal (52,132 ) (36,396 ) (40,189 ) Total net income Ps. 5,159 Ps. 17,280 Ps. 29,191
Disclosure of detailed information about investment property [text block]	The following table summarizes investment properties as of December 31, 2017 and 2016: December 31, 2017 Cost Accumulated Carrying amount Land Ps. 365,675 Ps. 159,836 Ps. 525,511 Buildings 217,897 40,386 258,283 Balance as of December 31, 2017 Ps. 583,572 Ps. 200,222 Ps. 783,794 December 31, 2016 Cost Accumulated Carrying amount Land Ps. 267,869 Ps. 123,287 Ps. 391,156 Buildings 189,650 29,382 219,032 Balance as of December 31, 2016 Ps. 457,519 Ps. 152,669 Ps. 610,188
Disclosure of rental income from investment property, net of direct operating expense [text block]	The following amounts have been recognized in the consolidated statement of income during the years ended on December 31, 2017, 2016 and 2015 in relation to investments properties: December 31, December 31, December 31, Income from rents Ps. 11,992 Ps. 5,183 Ps. 6,986 Direct operating expenses deriving from property investments which create income from rent (1,053 ) (321 ) (1,798 ) Direct operating expenses deriving from property investments which do not create income from rent (4,239 ) (1,328 ) (762 ) Net Ps. 6,700 Ps. 3,534 Ps. 4,426
Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Disclosure of detailed information about property, plant and equipment [text block]	Following is the detail of the balance at December 31, 2017 and 2016, by type: Cost Accumulated Impairment Carrying December 31, 2017 Land Ps. 1,007,788 Ps. - Ps. (3,741 ) Ps. 1,004,047 Buildings 2,640,644 (485,924 ) (116 ) 2,154,604 Office equipment and accessories 944,127 (613,400 ) (226 ) 330,501 Information technology equipment 1,573,284 (1,121,179 ) (11 ) 452,094 Vehicles 131,301 (62,304 ) - 68,997 Equipment and machinery 1,362,242 (187,500 ) (3,299 ) 1,171,443 Silos 8,613 (4,760 ) - 3,853 Warehouses 43,592 (25,734 ) - 17,858 Advanced payments for the acquisition of plant property and equipment 6,974 - - 6,974 Improvements in leaseholds properties 348,431 (182,318 ) - 166,113 Construction in progress 211,120 - - 211,120 Bearer plants 219,441 (7,048 ) - 212,393 Balance as of December 31, 2017 Ps. 8,497,557 Ps. (2,690,167 ) Ps. (7,393 ) Ps. 5,799,997 Cost Accumulated Impairment Carrying December 31, 2016 Land Ps. 1,010,753 Ps. - Ps. (1,452 ) Ps. 1,009,301 Buildings 2,598,571 (396,015 ) (213 ) 2,202,343 Office equipment and accessories 939,344 (600,743 ) (72 ) 338,529 Information technology equipment 1,555,655 (1,086,475 ) - 469,180 Vehicles 130,493 (69,282 ) - 61,211 Equipment and machinery 1,352,413 (150,677 ) (762 ) 1,200,974 Silos 8,613 (4,445 ) - 4,168 Warehouses 43,457 (24,819 ) - 18,638 Advanced payments for the acquisition of plant property and equipment 17,455 - - 17,455 Improvements in leaseholds properties 307,289 (152,067 ) - 155,222 Construction in progress 225,803 - - 225,803 Bearer plants 199,090 (2,665 ) - 196,425 Balance as of December 31, 2016 Ps. 8,388,936 Ps. (2,487,188 ) Ps. (2,499 ) Ps. 5,899,249
Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Disclosure of finance lease and operating lease by lessor [text block]	Following is movement of carrying value amounts of the balance to as of December 31, 2017 and 2016, by type: Cost Accumulated Impairment Carrying December 31, 2017 Equipment, furniture and office equipment Ps. 203 Ps. (203 ) Ps. - Ps. - Computing equipment 3,363 (1,484 ) - 1,879 Vehicles 3,627 (1,834 ) - 1,793 Mobilization equipment and machinery 489 (85 ) - 404 Balance as of December 31, 2017 Ps. 7,682 Ps. (3,606 ) Ps. - Ps. 4,076 Cost Accumulated Impairment Carrying December 31, 2016 Equipment, furniture and office equipment Ps. 264 Ps. (264 ) Ps. - Ps. - Computing equipment 1,838 (1,712 ) (88 ) 38 Vehicles 3,876 (1,968 ) - 1,908 Mobilization equipment and machinery 1,069 (939 ) - 130 Balance as of December 31, 2016 Ps. 7,047 Ps. (4,883 ) Ps. (88 ) Ps. 2,076

CONCESSION ARRANGEMENTS RIGHTS

CONCESSION ARRANGEMENTS RIGHTS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about service concession arrangements [abstract]
Disclosure of detailed information about service concession arrangements [text block]	The following table shows the changes in the financial assets in concession arrangements registered for Grupo Aval’s subsidiaries in the years ended at December 31, 2017 and 2016: At fair value At amortized cost Total Balance at January 1, 2015 Ps. 1,738,598 Ps. 119,337 Ps. 1,857,935 Additions or new concession arrangements - 369,983 369,983 Collections during the year - (400,703 ) (400,703 ) Adjustment to fair value credited to income 153,094 - 153,094 Changes in accounting estimates (1) - (111,432 ) (111,432 ) Accrued interest - 65,679 65,679 Balance at December 31, 2015 Ps. 1,891,692 Ps. 42,864 Ps. 1,934,556 Additions or new concession arrangements - 408,040 408,040 Collections during the year - (327,607 ) (327,607 ) Adjustment to fair value credited to income 180,982 - 180,982 Accrued interest - 79,944 79,944 Balance at December 31, 2016 Ps. 2,072,674 Ps. 203,241 Ps. 2,275,915 Additions or new concession arrangements (2) - 698,749 698,749 Collections during the year - (162,271 ) (162,271 ) Adjustment to fair value credited to income 209,937 - 209,937 Accrued interest - 46,299 46,299 Balance at December 31, 2017 Ps. 2,282,611 Ps. 786,018 Ps. 3,068,629 (1) During 2015, the subsidiaries Estudios, Proyectos e Inversiones de los Andes S.A. and Proyectos de Infraestructura S.A. reassessed the allocation of the fair value of two mixed concession contracts, between the financial asset and the intangible asset that arise from the contract, as a result of clarifications made to the contracts due to requirements for additional work. As a result, it was determined to perform an adjustment to their carrying amount by a reclassification of the amount of Ps. 111,432 from the financial assets at amortized cost included in other accounts receivable, to intangible assets. (2) The Corporación Financiera Colombiana - Corficolombiana S.A., acquired an additional 40% of the Concesionaria Vial del Pacífico S.A.S. and an additional 40% of the Concesionaria Nueva Vía al Mar S.A.S., both domiciled in Colombia, increasing amortized cost in Ps. 396,467 (this acquisition is considered non-significant).
Disclosure of detailed information about intangible assets [text block]	The following table shows the a roll-forward of in the main concession agreements of Grupo Aval’s subsidiaries under intangible assets during the years ended at December 31, 2017, 2016 and 2015: Promigas S.A. Concesionaria Proyectos de Episol S.A.S. Total Cost At December 31, 2015 Ps. 1,884,476 Ps. 554,037 Ps. 262,406 Ps. 72,391 Ps. 2,773,310 Additions 421,202 96,621 11,150 83,206 612,179 Reclassification to PPE 68,587 - 3 1 68,591 Withdrawals / Sales (4,334 ) (17 ) - - (4,351 ) At December 31, 2016 Ps. 2,369,931 Ps. 650,641 Ps. 273,559 Ps. 155,598 Ps. 3,449,729 Additions 193,489 82,629 29,305 305,486 610,909 Reclassification to PPE (14,408 ) - - - (14,408 ) Withdrawals / Sales (1,915 ) (1,590 ) - - (3,505 ) Foreign exchange adjustment (1,041 ) - - - (1,041 ) At December 31, 2017 Ps. 2,546,056 Ps. 731,680 Ps. 302,864 Ps. 461,084 Ps. 4,041,684 Accumulated Amortization At December 31, 2015 (149,743 ) Ps. (210,657 ) Ps. (18,971 ) Ps. (3,237 ) Ps. (382,608 ) Amortization of the year (100,850 ) (148,749 ) (9,485 ) (1,583 ) (260,667 ) Reclassification to PPE (2,111 ) - (2 ) - (2,113 ) Withdrawals / sales 973 - - - 973 At December 31, 2016 Ps. (251,731 ) Ps. (359,406 ) Ps. (28,458 ) Ps. (4,820 ) Ps. (644,415 ) Amortization of the year (119,549 ) (153,212 ) (10,083 ) (1,645 ) (284,489 ) Reclassification to PPE 841 - - - 841 Withdrawals / sales 630 - - - 630 Foreign exchange adjustment (84 ) - - - (84 ) At December 31, 2017 Ps. (369,893 ) Ps. (512,618 ) Ps. (38,541 ) Ps. (6,465 ) Ps. (927,517 ) Total Intangible Assets Balance at December 31, 2015 Ps. 1,734,733 Ps. 343,380 Ps. 243,435 Ps. 69,154 Ps. 2,390,702 Cost 485,455 96,604 11,153 83,207 676,419 Amortization (101,988 ) (148,749 ) (9,487 ) (1,583 ) (261,807 ) Balance at December 31, 2016 Ps. 2,118,200 Ps. 291,235 Ps. 245,101 Ps. 150,778 Ps. 2,805,314 Cost 176,125 81,039 29,305 305,486 591,955 Amortization (118,162 ) (153,212 ) (10,083 ) (1,645 ) (283,102 ) Balance at December 31, 2017 Ps. 2,176,163 Ps. 219,062 Ps. 264,323 Ps. 454,619 Ps. 3,114,167
Disclosure of detailed information about activity of income and costs incurred in construction stage on concession arrangements [Text Block]	The following is the activity of income and costs incurred in the construction stage of the concession arrangements: Accumulated income recorded in the income statement Promigas S.A. Concesionaria Vial Proyectos de Episol S.A.S. Concesionaria Concesionaria Total Balance at January 1, 2015 318,699 229,729 - 80,042 - - 628,470 Income from concession contracts during the period 52,507 480,901 13,874 50,353 - - 597,635 Income from toll during the period - 230,348 197,648 - - - 427,995 Administration, Operation and maintenance (AOM) fees during the period - - - 4,401 - - 4,401 Financial income during the period 153,093 63,563 4 - - 216,660 Movement during the period 205,600 774,811 211,522 54,758 - - 1,246,691 Balance at December 31, 2015 Ps. 524,299 Ps. 1,004,540 Ps. 211,522 Ps. 134,800 Ps. - Ps. - Ps. 1,875,161 Income from concession contracts during the period 583,018 334,762 77,466 150,147 - - 1,145,393 Income from toll during the period - 215,319 213,294 73,922 - - 502,535 Administration, Operation and maintenance (AOM) fees during the period - - - 37,436 - - 37,436 Financial income during the period 180,982 - - - - - 180,982 Adjustment for interest during the period - 68,237 - 3,351 - - 71,588 Movement during the period Ps. 764,000 Ps. 618,318 Ps. 290,760 Ps. 264,856 Ps. - Ps. - Ps. 1,937,934 Balance at December 31, 2016 Ps. 1,288,299 Ps. 1,622,858 Ps. 502,282 Ps. 399,656 Ps. - Ps. - Ps. 3,813,095 Income from concession contracts during the period 193,185 217,954 51,939 413,203 104 63,149 939,534 Income from toll during the period - 236,790 228,643 40,841 - - 506,274 Administration, Operation and maintenance (AOM) fees during the period - - - 67,468 919 - 68,387 Financial income during the period 209,936 - - - - - 209,936 Adjustment for interest during the period - 24,439 - 20,780 1,080 - 46,299 Movement during the period Ps. 403,121 Ps. 479,183 Ps. 280,582 Ps. 542,292 Ps. 2,103 Ps. 63,149 Ps. 1,770,430 Balance at December 31, 2017 Ps. 1,691,420 Ps. 2,102,041 Ps. 782,864 Ps. 941,948 Ps. 2,103 Ps. 63,149 Ps. 5,583,525 Costs incurred in the concession, recorded in the statement of income Promigas S.A. Concesionaria Vial Proyectos de Episol S.A.S. Concesionaria Concesionaria Total Balance at January 1, 2015 160,772 219,083 - - - - 379,855 Construction cost incurred during the period 52,507 480,901 13,874 - - - 547,282 Financial cost incurred during the period 771 38,022 - - - - 38,793 Movement during the period 53,278 518,923 13,874 - - - 586,075 Balance at December 31, 2015 Ps. 214,050 Ps. 738,006 Ps. 13,874 Ps. - Ps. - Ps. - Ps. 965,930 Construction cost incurred during the period 583,018 334,762 77,466 150,147 - - 1,145,393 Financial cost incurred during the period 2,398 37,793 - - - - 40,191 Movement during the period Ps. 585,416 Ps. 372,555 Ps. 77,466 Ps. 150,147 Ps. - Ps. - Ps. 1,185,584 Balance at December 31, 2016 Ps. 799,466 Ps. 1,110,561 Ps. 91,340 Ps. 150,147 Ps. - Ps. - Ps. 2,151,514 Construction cost incurred during the period 193,185 209,055 51,939 214,105 104 11,993 680,381 Financial cost incurred during the period 3,308 - - 39,388 4,908 - 47,604 Movement during the period Ps. 196,493 Ps. 209,055 Ps. 51,939 Ps. 253,493 Ps. 5,012 Ps. 11,993 Ps. 727,985 Balance at December 31, 2017 Ps. 995,959 Ps. 1,319,616 Ps. 143,279 Ps. 403,640 Ps. 5,012 Ps. 11,993 Ps. 2,879,499

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about goodwill [Abstract]
Disclosure of reconciliation of changes in goodwill [text block]	Following is the roll-forward of goodwill balances during the years ended December 31, 2017 and 2016: December 31, 2017 December 31, 2016 Balance at the beginning of the year Ps. 6,824,935 Ps. 7,055,975 Additions / Purchases (1) 102,376 2,805 Foreign exchange adjustment (26,255 ) (233,845 ) Balance at the end of the year Ps. 6,901,056 Ps. 6,824,935 (1) Corficolombiana acquired in 2017 an additional 40 % of the Concesionaria Vial del Pacífico – Covipacífico S.A.S., located in Colombia. The business acquisition generated Goodwill of Ps. 102,376 which was included in the Financial Statements of Grupo Aval at the end of the 2017 accounting period. (this acquisition is considered non-significant)
Disclosure of information for cash-generating units [text block]	The following is the detail of goodwill assigned by cash generating units (CGU) representing the lowest identifiable level within Grupo Aval and monitored by management, in addition those are not greater than the identified business’ segments: December 31, 2017 CGU Goodwill CGU Book CGU Excess Leasing Bogotá Panamá Ps. 4,688,362 Ps. 11,349,292 Ps. 17,054,833 Ps. 5,705,541 Inside Banco de Bogotá S.A. (Megabanco) 465,905 7,353,562 9,483,254 2,129,692 Promigas S.A and Subsidiaries 169,687 3,653,698 9,392,266 5,738,568 Concesionaria Panamericana S.A.S 119,916 169,451 261,223 91,772 Concesionaria Covipacífico S.A.S. (1) 102,376 104,600 111,026 6,426 Hoteles Estelar S.A 6,661 98,688 179,420 80,732 Inside Banco de Occidente S.A. (Banco Unión) 22,724 2,648,449 2,878,178 229,729 Banco Popular S.A. 358,401 2,710,218 3,316,807 606,589 Banco de Bogotá S.A. 301,222 11,000,669 15,361,349 4,360,680 Banco de Occidente S.A. 127,571 3,174,228 4,394,187 1,219,959 Sociedad Administradora de Pensiones y Cesantías Porvenir S.A. 538,231 2,888,669 9,610,514 6,721,845 6,901,056 (1) Corresponds to 40% of the Consesionaria Vial del Pacífico – Covipacífico S.A.S. (this acquisition is considered as non-significant) December 31, 2016 CGU Goodwill CGU Book CGU Excess Leasing Bogotá Panamá Ps. 4,714,617 Ps. 10,428,240 Ps. 14,362,910 Ps. 3,934,670 Inside Banco de Bogotá S.A. (Megabanco) 465,905 5,579,593 9,976,659 4,397,066 Promigas S.A and Subsidiaries 169,687 2,785,270 7,089,387 4,304,116 Concesionaria Panamericana S.A.S 119,916 35,585 370,248 334,663 Hoteles Estelar S.A 6,661 90,794 97,956 7,162 Inside Banco de Occidente S.A. (Banco Union) 22,724 41,935 454,906 412,971 Banco Popular S.A. 358,401 2,624,196 3,541,307 917,111 Banco de Bogotá S.A. 301,222 10,331,548 13,708,171 3,376,623 Banco de Occidente S.A. 127,571 3,089,717 4,168,844 1,079,127 Sociedad Administradora de Pensiones y Cesantías Porvenir S.A. 538,231 2,433,816 9,187,043 6,753,227 6,824,935
Disclosure of detailed information about averages of primary premises used in reports on impairment of cash-generating units with allocated goodwill [Text Block]	The following table shows the averages of the primary premises used in the reports on impairment of the cash-generating units with allocated goodwill, based on the impairment assessments done on the indicated dates. Although the valuation exercise includes a 10 year projection, the following tables only show the first 5 years as, following the first year of projection, rates are generally stable with no significant variations. December 31, 2017 2018 2019 2020 2021 2022 Lending rate on the loan portfolio and investments 11.0 % 11.0 % 11.0 % 11.0 % 11.1 % Borrowing rate 2.7 % 2.8 % 2.9 % 3.0 % 3.0 % Growth in income from commissions 6.5 % 8.3 % 8.2 % 8.2 % 8.3 % Growth in expenses 6.1 % 6.2 % 6.7 % 6.7 % 6.8 % Discount rate after taxes 11.3 % Growth rate after ten years 3.0 % December 31, 2016 2017 2018 2019 2020 2021 Lending rate on the loan portfolio and investments 10.8 % 10.8 % 10.8 % 10.8 % 10.9 % Borrowing rate 3.0 % 3.0 % 3.0 % 3.0 % 3.0 % Growth in income from commissions 3.9 % 5.6 % 6.6 % 5.7 % 6.5 % Growth in expenses 5.8 % 7.4 % 7.1 % 6.8 % 6.2 % Discount rate after taxes 13.2 % Growth rate after ten years 3.0 %
Disclosure of detailed information about allocation of goodwill to cash generating units [Text Block]	That goodwill was allocated to the groups of cash-generating units inside Banco de Bogotá involved in the following lines of business: Share (%) Value Commercial 32.7 % 152,539 Consumer 30.8 % 143,287 Payroll installment loans 27.0 % 125,934 Vehicles 6.7 % 31,304 Microcredit 2.8 % 12,841 Total 100.0 % 465,905
Disclosure of detailed information about main premises used in latest impairment tests of cash-generating units with allocated goodwill [Text Block]	The following table shows the main premises used in the latest impairment tests of the groups of cash-generating units with allocated goodwill. These were performed in December 2017 and December 2016 December 31, 2017 2018 2019 2020 2021 2022 Lending rate on the loan portfolio and investments 9.6 % 9.4 % 9.3 % 9.5 % 9.6 % Borrowing rate 3.6 % 3.3 % 3.2 % 3.6 % 3.8 % Growth in income from commissions 9.2 % 7.7 % 7.8 % 8.5 % 8.5 % Growth in expenses 2.5 % 4.0 % 4.0 % 5.1 % 4.4 % Inflation 3.3 % 3.4 % 3.2 % 3.3 % 3.6 % Discount rate after taxes 14.0 % Growth rate after five years 3.5 % December 31, 2016 2017 2018 2019 2020 2021 Lending rate on the loan portfolio and investments 10.5 % 10.0 % 9.6 % 9.2 % 9.0 % Borrowing rate 4.7 % 4.1 % 3.7 % 3.2 % 3.2 % Growth in income from commissions 17.2 % 21.3 % 12.2 % 12.2 % 15.6 % Growth in expenses 7.0 % 10.8 % 10.8 % 11.0 % 12.7 % Inflation 4.1 % 3.0 % 3.1 % 3.0 % 3.0 % Discount rate after taxes 15.7 % Growth rate after five years 3.0 %
Disclosure of detailed information about main premises used in impairment test reports taken as basis for impairment testing [Text Block]	The following are the main premises used in the impairment test reports taken as the basis for impairment testing on the dates listed, although the valuation exercise includes a 20 year projection, the following tables only show the first 5 years as, following the first year of projection, rates are generally stable with no significant variations. December 31, 2017 2018 2019 2020 2021 2022 Interest rate on investments 5.8 % 5.9 % 5.7 % 5.8 % 6.2 % Borrowing rate 6.3 % 6.3 % 6.3 % 6.3 % 6.3 % Growth in income from commissions 14.2 % 8.0 % 7.7 % 7.6 % 7.5 % Growth in expenses 11.2 % 6.7 % 6.1 % 6.1 % 6.4 % Inflation 3.3 % 3.4 % 3.2 % 3.3 % 3.6 % Discount interest rate after taxes 13.0 % Growth rate after twenty years 3.5 % December 31, 2016 2017 2018 2019 2020 2021 Lending interest rate on investments 6.5 % 5.9 % 6.2 % 6.2 % 6.2 % Borrowing rate 6.3 % 6.3 % 6.3 % 6.3 % 6.3 % Growth in income from commissions 6.9 % 12.7 % 7.2 % 7.1 % 6.9 % Growth in expenses 3.5 % 13.2 % 5.3 % 6.5 % 5.9 % Inflation 3.7 % 3.0 % 3.1 % 3.0 % 3.0 % Discount interest rate after taxes 12.9 % Growth rate after twenty years 4.0 %

OTHER INTANGIBLE ASSETS (Tables

OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Intangible assets other than goodwill [abstract]
Disclosure of detailed information about other intangible assets [Text Block]	Below is the detail of the balances of other intangible assets as of December 31, 2017 and 2016: December 31, 2017 Description Cost Accumulated Net book Software and information technology applications purchased Ps. 845,402 Ps. (292,959 ) Ps. 552,443 Licenses 391,726 (137,998 ) 253,728 Other intangibles assets 52,125 (9,615 ) 42,510 Total Ps. 1,289,253 Ps. (440,572 ) Ps. 848,681 December 31, 2016 Description Cost Accumulated Net book Software and information technology applications purchased Ps. 649,053 Ps. (208,485 ) Ps. 440,568 Licenses 338,206 (98,296 ) 239,910 Other intangibles assets 66,592 (12,027 ) 54,565 Total Ps. 1,053,851 Ps. (318,808 ) Ps. 735,043

INCOME TAX (Tables)

INCOME TAX (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of income tax [Line Items]
Major Components Of Income Tax Expenses [Text Block]	The expense for income tax for the years ended on December 31, 2017, 2016 and 2015 comprise the following: December 31, December 31, December 31, Current period income tax Ps. 1,276,458 Ps. 1,264,066 Ps. 1,190,949 Income tax surcharge 151,980 - - CREE tax - 295,324 356,475 CREE surcharge - 193,425 200,965 Subtotal current period taxes 1,428,438 1,752,815 1,748,389 Prior years adjustments (1) (117,568 ) (13,440 ) (19,282 ) Adjustment due to uncertain tax positions in prior years (7,367 ) (31,067 ) 3,542 Deferred taxes 449,291 348,601 146,321 Total Ps. 1,752,794 Ps. 2,056,909 Ps. 1,878,970 (1) Includes a Ps. 109,632 tax recovery at Banco de Bogotá for the years 2014, 2015 and 2016
Reconciliation Between Effective Income Tax Explanatory [Text Block]	Below is the detailed reconciliation between total expenses of the income tax of Grupo Aval calculated at the applicable enacted tax rate and the tax expense recognized in the statement of income for the years ended on December 31, 2017, 2016 and 2015: Years ended on: December 31, December 31, December 31, Profit before income tax Ps. 4,915,227 Ps. 5,573,845 Ps. 5,224,656 Enacted tax rate in Colombia 40 % 40 % 39 % Theoretical income tax expense 1,966,091 2,229,538 2,037,616 Nondeductible expenses 387,933 339,803 298,773 Tax losses considered non recoverable for income tax purpose 96,266 140,904 - Presumptive income considered non recoverable for income tax purpose 7,991 45,385 28,954 Wealth tax 40,762 107,051 118,245 Nontaxable dividends (19,587 ) (15,655 ) (47,883 ) Nontaxable income under equity method in associates (68,026 ) (56,306 ) (91,572 ) Profit (loss) on sales or appraisal of investment (16,584 ) (71,669 ) (7,697 ) Nontaxable interest income and other income (137,312 ) (150,714 ) (61,561 ) Other nontaxable income (155,010 ) (83,742 ) (75,171 ) Revenues taxable at different tax rate (658 ) (14,983 ) (5,602 ) Difference from expenses deductibles at different tax rate (11,822 ) (4,679 ) 6,971 Tax benefits in the acquisition of property and equipment (20,585 ) (66,245 ) (67,574 ) Profits (losses) in Subsidiaries in tax free countries or with different tax rate (200,661 ) (143,109 ) (66,729 ) Effect on the deferred income tax due to changes in tax rates (38,574 ) (96,232 ) (71,962 ) Expenses considered non recoverable for deferred income tax purposes - 1,465 11,598 Prior year adjustments (117,568 ) (13,440 ) (44,581 ) Adjustments due to uncertain tax positions in previous year (7,367 ) (31,067 ) 28,374 Other 47,505 (59,396 ) (111,229 ) Total tax expense of the year Ps. 1,752,794 Ps. 2,056,909 Ps. 1,878,970 Effective income tax rate 35.66 % 36.90 % 35.96 %
Tax Loss Carry Forward In Excess of Minimum Presumptive Income Explanatory [Text Block]	As of December 31, 2017 and 2016, following table shows the detail of the tax loss carry forward and excess of presumptive income over taxable income of the entities of Grupo Aval which are not recognized as deferred tax assets. December December Tax loss carry forwards expiring on: December 31, 2019 4,732 - December 31, 2020 1,758 - December 31, 2029 3,107 - December 31, 2030 160,084 - Without expiration date 484,376 397,869 Subtotal 654,057 397,869 Excess of presumptive income expiring on: December 31, 2017 - 5,041 December 31, 2018 43,668 43,307 December 31, 2019 64,590 83,871 December 31, 2020 48,170 54,150 December 31, 2021 64,998 49,600 December 31, 2022 46,727 - Subtotal 268,153 235,969 Total Ps. 922,210 Ps. 633,838
Disclosure of temporary difference, unused tax losses and unused tax credits [text block]	Year ended on December 31, 2017 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 62,627 Ps. (30,580 ) Ps. (23,966 ) Ps. - Ps. 8,081 Equity securities at fair value 1,583 (1,254 ) (321 ) - 8 Derivative instruments 78,740 (41,935 ) - - 36,805 Accounts receivable 16,278 (15,589 ) - 10 699 Differences between the accounting and tax bases of loans and receivables 6,014 65,924 - - 71,938 Allowance for impairment on loans and receivables 105,573 (39,446 ) - - 66,127 Allowance for other accounts receivable 6,219 (1,570 ) - - 4,649 Financial assets in concession contracts 25,837 2,571 - 128 28,536 Differences between accounting and tax basis of foreclosed assets 4,846 13,315 - - 18,161 Differences between accounting and tax basis of the cost in property, plant and equipment 296,269 68,271 - - 364,540 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 5,699 6,294 - - 11,993 Biological assets 101 68 - - 169 Differences between accounting and tax basis of deferred charges and of intangible assets 113,817 30,922 - 886 145,625 Tax losses carry forward 385,855 (53,556 ) - 55 332,354 Surplus of presumptive income 19,480 (16,952 ) - - 2,528 Provisions 212,695 (17,649 ) - 2,917 197,963 Employee benefits 104,606 (29,658 ) 23,976 - 98,924 Deferred income 113,380 (113,380 ) - - - Lease agreements 9.160 (1,118 ) - - 8,042 Other 69,022 52,233 935 1,455 123,645 Subtotal Ps. 1,637,801 Ps. (123,089 ) Ps. 624 Ps. 5,451 Ps. 1,520,787 Defered tax liabilities Debt securities at fair value Ps. (27,278 ) Ps. 29,105 Ps. (46,319 ) Ps. - Ps. (44,492 ) Equity securities at fair value (122,513 ) 302 33 952 (121,226 ) Derivative instruments (67,974 ) (15,190 ) (4,361 ) - (87,525 ) Accounts receivable (260,621 ) (46,335 ) - - (306,956 ) Differences between the accounting and tax bases of loans and receivables (268,747 ) (53,999 ) - - (322,746 ) Allowance for impairment on loans and receivables (275,785 ) (122,053 ) - - (397,838 ) Differences between accounting and tax basis of foreclosed assets (46,783 ) (25,426 ) - - (72,209 ) Provision for foreclosed assets (37,798 ) (3,856 ) - - (41,654 ) Differences between the accounting and tax base for property plant and equipment costs (400,180 ) 36,404 - (38 ) (363,814 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (209,549 ) 30,948 - (1,276 ) (179,877 ) Differences between accounting and tax basis of deferred charges and of intangible assets (60,598 ) (47,123 ) - - (107,721 ) Provisions (471 ) (62 ) 116 (158 ) (575 ) Goodwill (86,036 ) (83,639 ) - - (169,675 ) Deferred Income (34,613 ) (5,921 ) - - (40,534 ) Financial assets in concession arrangements (718,496 ) 20,548 - (2,790 ) (700,738 ) Biological assets (6,806 ) (9,777 ) - - (16,583 ) Other (65,400 ) (30,128 ) (11,053 ) 2,537 (104,044 ) Subtotal Ps. (2,689,648 ) Ps. (326,202 ) Ps. (61,584 ) Ps. (773 ) Ps. (3,078,207 ) Net Ps. (1,051,847 ) Ps. (449,291 ) Ps. (60,960 ) Ps. 4,678 Ps. (1,557,420 ) Year ended on December 31, 2016 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 290,465 Ps. (5,459 ) Ps. (212,090 ) Ps. (10,289 ) Ps. 62,627 Equity securities at fair value 323 (26,416 ) 27,676 - 1,583 Derivative instruments 518,992 (223,831 ) (165,894 ) (50,527 ) 78,740 Accounts receivable 7,852 8,426 - - 16,278 Differences between the accounting and tax bases of loans and receivables 5,652 362 - - 6,014 Allowance for impairment on loans and receivables 96,054 9,679 - (160 ) 105,573 Allowance for other accounts receivable 18,119 (11,900 ) - - 6,219 Financial assets in concession contracts 12,096 13,741 - - 25,837 Differences between accounting and tax basis of foreclosed assets 13,326 (8,480 ) - - 4,846 Differences between accounting and tax basis of the cost in property, plant and equipment 58,505 237,739 - 25 296,269 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 5,415 284 - - 5,699 Biological assets 369 (268 ) - - 101 Differences between accounting and tax basis of deferred charges and of intangible assets 77,055 37,167 - (405 ) 113,817 Tax losses carry forward 527,153 (140,623 ) - (675 ) 385,855 Surplus of presumptive income 166,116 (146,636 ) - - 19,480 Provisions 146,578 60,716 5,706 (305 ) 212,695 Employee benefits 101,224 (5,718 ) 8,677 423 104,606 Goodwill 6,947 (6,947 ) - - - Deferred income 35,857 77,523 - - 113,380 Lease agreements 8,414 746 - - 9.160 Other 174,966 (107,102 ) - 1,158 69,022 Subtotal Ps. 2,271,478 Ps. (236,997 ) Ps. (335,925 ) Ps. (60,755 ) Ps. 1,637,801 Deffered tax liabilities Debt securities at fair value (19,943 ) 44,338 (51,673 ) - (27,278 ) Equity securities at fair value (104,317 ) (9,072 ) 13,059 (154 ) (100,484 ) Derivative instruments (333,317 ) 240,468 (21,586 ) 46,461 (67,974 ) Accounts receivable - (260,621 ) - - (260,621 ) Differences between the accounting and tax bases of loans and receivables (238,492 ) (30,255 ) - - (268,747 ) Allowance for impairment on loans and receivables (227,336 ) (48,449 ) - - (275,785 ) Differences between accounting and tax basis of foreclosed assets (83,774 ) 36,991 - - (46,783 ) Provision for foreclosed assets (15,198 ) (22,600 ) - - (37,798 ) Differences between the accounting and tax base for property plant and equipment costs (355,478 ) (44,865 ) - 163 (400,180 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (227,591 ) 18,114 - (72 ) (209,549 ) Differences between accounting and tax basis of deferred charges and of intangible assets (60,003 ) (595 ) - - (60,598 ) Unrealized profits of foreign subsidiaries (38,209 ) 16,180 - - (22,029 ) Provisions (1,961 ) 1,490 - - (471 ) Goodwill (42,822 ) (43,214 ) - - (86,036 ) Deferred Income (26,940 ) (7,673 ) - - (34,613 ) Financial assets in concession arrangements (627,666 ) (90,830 ) - - (718,496 ) Biological assets (17,578 ) 3,320 - 7,452 (6,806 ) Other (152,824 ) 85,669 - 1,755 (65,400 ) Subtotal Ps. (2,573,449 ) Ps. (111,604 ) Ps. (60,200 ) Ps. 55,605 Ps. (2,689,648 ) Net Ps. (301,971 ) Ps. (348,601 ) Ps. (396,125 ) Ps. (5,150 ) Ps. (1,051,847 ) Year ended on December 31, 2015 Balance as of Credited Credited Reclassifications Balance as of Deferred tax assets Debt securities at fair value Ps. 17,317 Ps. 240,415 Ps. 263,532 Ps. (230,799 ) Ps. 290,465 Equity securities at fair value 7,505 (1,082 ) - (6,100 ) 323 Derivatives instruments 555,521 (159,875 ) (19,044 ) 142,390 518,992 Differences between the accounting and tax bases of the loans and receivables 30,998 (26,337 ) - 991 5,652 Account receivable - 7,852 - - 7,852 Allowance for impairment on loans and receivables 102,662 12,503 - (19,111 ) 96,054 Allowance for other accounts receivable 1,897 (1,730 ) - 17,952 18,119 Financial asset in concession contracts 11,341 588 - 167 12,096 Differences between accounting and tax basis of goods received as payment 30,180 (16,854 ) - - 13,326 Differences between accounting and tax basis of the cost in property, plant and equipment 39,561 21,074 - (2,130 ) 58,505 Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment 6,938 (1,526 ) - 3 5,415 Biological assets 4,580 (4,211 ) - - 369 Differences between accounting and tax basis of deferred charges of intangible assets 59,354 17,701 - - 77,055 Tax losses carry forward 45,601 3,020 478,532 - 527,153 Surplus of presumptive income 16,147 (13,249 ) 163,218 - 166,116 Provisions 126,762 23,070 - (3,254 ) 146,578 Employee benefits 104,872 3,927 (7,251 ) (324 ) 101,224 Goodwill 6,947 - - - 6,947 Deferred Income 8,092 30,574 - (2,809 ) 35,857 Lease agreements 7,315 1,099 - - 8,414 Other 180,108 (68,038 ) - 62,896 174,966 Subtotal Ps. 1,363,698 Ps. 68,921 Ps. 878,987 Ps. (40,128 ) Ps. 2,271,478 Deffered tax liabilities Debt securities at fair value 9,509 (243,790 ) - 214,338 (19,943 ) Equity securities at fair value (103,469 ) 103 - (951 ) (104,317 ) Derivatives instruments (346,677 ) 149,307 - (135,947 ) (333,317 ) Differences between the accounting and tax bases of the loans and receivables (77,205 ) (27,030 ) - (134,257 ) (238,492 ) Allowance for impairment on loans and receivables (366,953 ) 5,457 - 134,160 (227,336 ) Differences between the accounting and tax base of goods received as payment (60,587 ) (44,414 ) - 21,227 (83,774 ) Provision for goods received as payment (10,070 ) (5,151 ) - 23 (15,198 ) Differences between the accounting and tax base for property plant and equipment costs (453,088 ) 98,866 - (1,256 ) (355,478 ) Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment (207,123 ) (23,775 ) - 3,307 (227,591 ) Differences between accounting and tax basis of deferred charges of intangible assets (33,639 ) (26,364 ) - - (60,003 ) Profits not carried as investments in subsidiaries (17,974 ) (20,235 ) - - (38,209 ) Provisions (24,468 ) 18,448 - 4,059 (1,961 ) Goodwill (23,166 ) (19,656 ) - - (42,822 ) Accumulative translation adjustment in foreign operations (22,661 ) (7,088 ) - 2,809 (26,940 ) Financial and intangible assets in concession contracts (484,105 ) (143,561 ) - - (627,666 ) Biological assets (10,098 ) (7,480 ) - - (17,578 ) Other (137,604 ) 81,121 - (96,340 ) (152,823 ) Subtotal Ps. (2,369,378 ) Ps. (215,242 ) Ps. - Ps. 11,171 Ps. (2,573,449 ) Net Ps. (1,005,680 ) Ps. (146,321 ) Ps. 878,987 Ps. (28,957 ) Ps. (301,971 )
Disclosure of deferred taxes [text block]	The Group offsets deferred tax assets and liabilities by entity and tax authority, considering the application of the tax provisions in Colombia and other countries in which the legal right to offset tax assets and liabilities and other requirements in IAS 12, according to the following breakdown: December 31, 2017 Gross Deferred tax Offset Balances on Statement Deferred tax asset Ps. 1,520,787 Ps. (1,381,364 ) Ps. 139,423 Deferred tax liability (3,078,207 ) 1,381,364 (1,696,843 ) Net Ps. (1,557,420 ) Ps. - Ps. (1,557,420 ) December 31, 2016 Gross Deferred tax Offset Balances on Statement Deferred tax asset Ps. 1,637,801 Ps. (1,442,839 ) Ps. 194,962 Deferred tax liability (2,689,648 ) 1,442,839 (1,246,809 ) Net Ps. (1,051,847 ) Ps. - Ps. (1,051,847 )
Disclosure of detailed information about the effects of the current and deferred income taxes in each component of Other Comprehensive Income [Text Block]	The effects of the current and deferred taxes in each component of other comprehensive income is detailed below during the years ended on December 31, 2017, 2016 and 2015: December 31, 2017 Amount Current Deferred Net Hedging of net investments in foreign subsidiaries operations Ps. (47,197 ) Ps. - Ps. - Ps. (47,197 ) Hedging derivatives in foreign currency 16,832 - (5,554 ) 11,278 Hedging financial liabilities in foreign currency 30,568 - (11,065 ) 19,503 Cash Flow hedging (2,340 ) - 969 (1,371 ) Foreign currency translation differences for foreign operations (91,497 ) (12,657 ) 956 (103,198 ) Debt financial instruments 284,480 - (69,743 ) 214,737 Equity financial instruments 57,245 - (720 ) 56,525 Investment in associates and joint ventures 1,128 - 116 1,244 Actuarial gains (losses) from defined benefit pension plans (100,232 ) - 24,081 (76,151 ) Total “other comprehensive income” during the period Ps. 148,987 Ps. (12,657 ) Ps. (60,960 ) Ps. 75,370 December 31, 2016 Amount Current Deferred Net Hedging of net investments in foreign subsidiaries operations Ps. (475,000 ) Ps. - Ps. - Ps. (475,000 ) Hedging derivatives in foreign currency 291,506 47,419 (187,480 ) 151,445 Hedging financial liabilities in foreign currency 35,819 (23,854 ) - 11,965 Cash Flow hedging 17,967 - - 17,967 Foreign currency translation differences for foreign operations (125,161 ) 8,204 - (116,957 ) Debt financial instruments 948,212 - (263,763 ) 684,449 Equity financial instruments 34,509 - 40,735 75,244 Investment in associates and joint ventures (20,061 ) - - (20,061 ) Actuarial gains (losses) from defined benefit pension plans (41,228 ) - 14,383 (26,845 ) Total “other comprehensive income” during the period Ps. 666,563 Ps. 31,769 Ps. (396,125 ) Ps. 302,207 December 31, 2015 Amount Current Deferred tax Net Hedging of net investments in foreign subsidiaries operations Ps. 2,366,849 Ps. (37,861 ) Ps. - Ps. 2,328,988 Hedging derivatives in foreign currency (1,683,346 ) 89,960 629,531 (963,855 ) Hedging financial liabilities in foreign currency (755,431 ) 267,528 - (487,903 ) Cash Flow hedging 17,500 - (6,825 ) 10,675 Foreign currency translation differences for foreign operations 24,878 - - 24,878 Debt financial instruments (922,083 ) - 263,532 (658,551 ) Equity financial instruments (6,548 ) - - (6,548 ) Investment in associates and joint ventures 31,964 - - 31,964 Actuarial gains (losses) from defined benefit pension plans 6,162 - (7,251 ) (1,089 ) Total “other comprehensive income” during the period Ps. (920,055 ) Ps. 319,627 Ps. 878,987 Ps. 278,559
Disclosure of detailed information about uncertainties in open tax positions [Text Block]	Uncertainties on open tax positions of the four banks of Grupo Aval are as follows: Bank December 31, 2017 December 31, 2016 Bogotá Ps. 86,592 Ps. 66,428 Occidente 7,657 31,463 Popular 443 338 Villas - 5,927 Total Ps. 94,692 Ps. 104,156
Disclosure of detailed information about the roll forward of tax uncertainties [Text Block]	The roll-forward of tax uncertainties during the years ended on December 31, 2017, 2016 and 2015 is as follows: December 31, December 31, December 31, Balance at the beginning of the year Ps. 104,156 Ps. 145,968 Ps. 114,627 Provisions increase during the year 18,039 31,039 30,191 Provisions used (873 ) (1,867 ) (1,145 ) Amounts reversed due to provisions not used (32,010 ) (73,084 ) (25,259 ) Financial cost 7,477 12,098 7,541 Foreign exchange adjustments (2,097 ) (9,998 ) 20,013 Balance at the end of the year Ps. 94,692 Ps. 104,156 Ps. 145,968
Disclosure of detailed information about the expiry of tax uncertainties [Text Block]	The balance as of December 31, 2017 and 2016 is expected to be completely used or released once the inspection rights from the tax authorities regarding tax returns expire, as follows: Year December 31, December 31, 2017 - 10,027 2018 3,484 11,057 2019 3,109 13,670 2020 21,579 23,926 2021 23,902 24,413 2022 23,034 19,681 2023 18,250 1,382 2024 1,334 - Total Ps. 94,692 Ps. 104,156

CUSTOMER DEPOSITS (Tables)

CUSTOMER DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Customer Deposits [Abstract]
Disclosure of detailed information about deposits [Text Block]	Following is a detail of the balances of the deposits received from Grupo Aval´s customer: Detail December 31, 2017 December 31, 2016 Demand Checking accounts Ps. 36,017,602 Ps. 34,978,189 Savings accounts 55,778,677 50,573,924 Other funds on demand 472,782 328,798 92,269,061 85,880,911 Term deposits Fixed term deposit certificates 62,616,163 58,006,144 Total Deposits 154,885,224 143,887,055 Per currency In Colombian Pesos 96,797,225 90,834,599 In foreign currency 58,083,025 53,014,364 Other 4,974 39,092 Total per currency Ps. 154,885,224 Ps. 143,887,055
Disclosure of detailed information about the maturities of term deposits [Text Block]	The detail of the maturities of term deposits in force as of December 31, 2017 is as follows: Year 2017 2018 Ps. 44,746,591 2019 8,672,896 2020 2,872,870 2021 1,418,289 After 2021 4,905,517 Total Ps. 62,616,163
Disclosure of detailed information about the effective interest rates which are accrued on customer deposits [Text Block]	A summary of the effective interest rates which are accrued on customer deposits is as follows: December 31, 2017 Deposits In foreign currency Minimum Maximum Minimum Maximum % % % % Checking accounts 0.06 % 5.77 % 0.15 % 1.50 % Saving accounts 0.01 % 8.55 % 0.05 % 8.00 % Fixed term deposit certificates 0.05 % 9.72 % 0.01 % 10.43 % December 31, 2016 Deposits In foreign currency Minimum Maximum Minimum Maximum % % % % Checking accounts 0.53 % 8.54 % 0.10 % 4.08 % Saving accounts 0.01 % 8.75 % 0.05 % 4.08 % Fixed term deposit certificates 0.05 % 12.64 % 0.05 % 13.04 %
Disclosure of detailed information about concentration of deposits by economic sector [Text Block]	Following is the detail of the concentration of deposits received from customers per economic sector: December 31, 2017 December 31, 2016 Amount % Amount % Commerce 29,587,825 19 % 20,717,015 14 % Financial 25,302,624 16 % 19,591,523 14 % Individuals 23,362,871 15 % 36,983,897 26 % Government and Colombian Government Entities 17,443,318 11 % 14,879,219 10 % Manufacturing 9,016,500 6 % 7,902,332 5 % Real Estate 6,197,620 4 % 7,078,922 5 % Agriculture and livestock 2,401,684 2 % 3,241,177 2 % Colombian Municipalities 2,290,683 1 % 3,289,615 2 % Foreign Governments 799,687 1 % 1,048,947 1 % Other(1) 38,482,412 25 % 29,154,408 21 % Total 154,885,224 100 % 143,887,055 100 % (1) December 31, 2017, includes deposits from, education entities of Ps. 1,189,343, services sector of Ps. 10,201,383, science and technology Ps. 1,884,123, hydrocarbons Ps. 3,113,098, transport Ps. 1,990,271 and others in the sector Ps. 20,104,194.

FINANCIAL OBLIGATIONS (Tables)

FINANCIAL OBLIGATIONS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Deposits From Financial Obligations [Abstract]
Disclosure of Detailed Information about Financial Obligations [Text Block]	Following is a summary of the financial obligations of Grupo Aval as at December 31, 2017 and 2016: December December Local Currency Interbank funds Overnight funds Ps. 1,464 Ps. 2,075 Interbank funds purchased 336,431 1,366,757 Commitments to transfer open and closed repo operations 715,364 1,259,676 Commitments to transfer simultaneous operations 2,272,496 2,436,838 Commitments originated in short positions simultaneous operations 176,048 538,016 Total interbank funds Ps. 3,501,803 Ps. 5,603,362 Borrowings 2,831,100 2,084,988 Letters of credit 485 3,509 Bankers´ acceptances 17 517 Total borrowings from banks and others Ps. 2,831,602 Ps. 2,089,014 Foreign currency Interbank funds Overnight funds 217 3,498 Interbank funds purchased 1,135,110 309,924 Commitments to transfer open and closed repo operations 333,300 398,933 Total interbank funds Ps. 1,468,627 Ps. 712,355 Borrowings 14,529,524 15,086,112 Letters of credit 195,988 6,976 Bankers´ acceptances 648,206 724,531 Total borrowings from banks and others Ps. 15,373,718 Ps. 15,817,619 Total financial obligations Ps. 23,175,750 Ps. 24,222,350
Disclosure of Detailed Information About Other Borrowings Explanatory [Text Block]	The details of the borrowings from these entities as of December 31, 2017 and 2016 and are as follows: Interest rates in force at cut off December 31, December 31, Banco de Comercio Exterior - “BANCOLDEX” Fixed between 0.07% and %13.20%, DTF + 0.01 to 14.43%, IBR + 0.01 to 14.43, LIBOR6 + 0.01 to 4.46, LIBOR12 +0.01 Ps. 835,667 Ps. 736,721 Fondo para el Financiamiento del Sector Agropecuario - “FINAGRO” Fixed between 5.22% and 6.30%, DTF + 0.01 to 7.74%, IBR and IPC + 2.0 and 7.74%, 342,728 337,649 Financiera de Desarrollo Territorial “FINDETER” Fixed 0.03% and 9.77%, DTF + 0.01 to 8.48, IBR+ 0.30 to 8.48, IPC+ 0.01 and 0.05%, LIBOR3 0.04 and LIBOR6 +0.04% 1,819,695 1,651,325 Total Ps. 2,998,090 Ps. 2,725,695
Disclosure of Detailed Information About Maturities of Financial Obligations with Development Entities [Text Block]	Details showing the maturities of the financial obligations with development entities as for December 31, 2017 are as follows: Year 2017 2018 Ps. 207,509 2019 197,193 2020 400,848 2021 353,270 After 2021 1,839,270 Total Ps. 2,998,090
Disclosure of detailed information about bond issued [Text Block]	a) The detail of liabilities as of December 31, 2017 and 2016, by issue date and maturity date was as follows: Peso denominated Issuer Issue Date December December Maturity Date Interest Rate Banco de Bogotá S.A. 23/02/2010 132,989 248,234 23/02/2020 CPI + 5.45% Banco de Occidente Between 25/08/2008 and 14/12/2017 3,271,929 2,811,593 Between 16/07/2018 and 14/12/2032 CPI + 2.90% to 7.00% Corporación Financiera Colombiana S.A. Between 20/05/2009 and 08/09/2016 2,361,702 2,356,272 Between 11/03/2019 and 08/09/2036 CPI + 4.00% to 6.9% Banco Popular Between 26/02/2013 and 12/09/2017 1,571,308 1,620,504 Between 17/02/2018 and 12/10//2026 CPI + 2.44% to 4.13% Grupo Aval 03/12/2009 and 28/06/2017 Ps. 1,109,240 Ps. 704,726 Between 03/12/2019 and 28/06/2042 CPI + 2.69% to 5.20% Peso denominated Total Ps. 8,447,168 Ps. 7,741,329 Foreign Currency Banco de Bogotá S.A. Between 19/02/2013 and 03/08 /2017 6,459,452 6,656,720 Between 19/02/2023 and 03/08/2027 Fixed between 4.38% and 6.25% BAC Credomatic El Salvador Between 11/02/2013 and 28/11/2017 635,536 552,861 Between 27/01/2018 and 25/05/2022 Between 5.20% and 5.80% Issuer Issue Date December December Maturity Date Interest Rate Guatemala Between 15/02/2016 and 20/12/2017 400,244 543,441 Between 04/01/2018 and 25/02/2019 Between 4.50% and 8.50% Honduras Between 23/07/2013 and 06/12/2017 159,674 68,929 Between 26/03/2018 and 06/12/2020 Between 0.50% and 9.50% Nicaragua - - 12,040 - - BAC Credomatic Total Ps. 1,195,454 Ps. 1,177,271 Banco Bogotá Total Ps. 7,654,906 Ps. 7,833,991 Grupo Aval Limited 19/09/2012 3,000,122 2,992,916 26/09/2022 4.75% Foreign Currency Total Ps. 10,655,028 Ps. 10,826,907 Total of Bonds Ps. 19,102,196 Ps. 18,568,236
Disclosure of detailed information About Future Maturities of Bonds [Text Block]	Future maturities of bonds as of December 31, 2017 are as follows: Year 2017 2018 Ps. 983,915 2019 1,332,505 2020 1,973,046 2021 452,159 After 2021 14,360,571 Total Ps. 19,102,196

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Defined Benefit Plan Explanatory [Abstract]
Disclosure of Defined Benefits Plans Explanatory [Text Block]	The detail of the balance of liabilities for employee benefits at December 31, 2017, and 2016 is as follows: December 31, 2017 December 31, 2016 Short term Ps. 404,292 Ps. 397,460 Post-employment 604,110 509,022 Long term 229,770 191,112 Total Ps. 1,238,172 Ps. 1,097,594
Disclosure of net defined benefit liability (asset) [text block]	Post-employment and long-term benefits movements during the years ended at December 31, 2017, 2016 and 2015 are as follows: Post-Employment benefits Long-term Benefits December December December December December December Balance at the beginning of the year Ps. 509,022 Ps. 436,696 Ps. 442,258 Ps. 191,112 Ps. 206,971 Ps. 188,522 Service costs 4,425 3,006 2,158 18,201 19,243 16,745 Interests cost 51,027 69,348 31,338 8,928 (20,274 ) 11,975 Gain on settlements 252 - - (112 ) - - Past Service Costs - - 2,712 - - 2,711 564,726 509,050 478,466 218,129 205,940 219,953 Changes in actuarial assumptions from changes in demographic assumptions. (8,863 ) (1,232 ) 7,171 (1,432 ) (6,456 ) (2,162 ) Changes in actuarial assumptions from changes in financial assumptions. 109,095 42,460 (1,009 ) 43,870 18,845 7,515 100,232 41,228 6,162 42,438 12,389 5,353 Exchange differences (982 ) 6,083 (27 ) - - 8,236 Payments to employees (59,866 ) (47,337 ) (47,905 ) (30,797 ) (27,217 ) (26,571 ) Balance at the end of the year Ps. 604,110 Ps. 509,022 Ps. 436,696 Ps. 229,770 Ps. 191,112 Ps. 206,971
Disclosure of Detail Information of Variables Used to Calculate Obligation [Text Block]	The assumptions used to calculate the obligation projected for different post-employment benefits employees are as follows: Post-Employment Benefits December 31, December 31, Discount interest rate 6.59% 7.23% Inflation rate 3.50% 3.50% Salary growth rate 3.50% 3.50% Pension growth rate 3.50% 3.50% Employee turnover rate (between service year 1 and 40 for men and women the following is the turnover rate) Tabla de Rotación SoA 2003 (1) Tabla de Rotación SoA 2003 (1) Long-Term Benefits December 31, December 31, Discount interest rate 6.33% 7.23% Inflation rate 3.50% 3.50% Salary growth rate 3.50% 3.50% Pension growth rate N/A N/A Employee turnover rate (between service year 1 and 40 for men and women the following is the turnover rate) Tabla de Rotación SoA 2003 (1) Tabla de Rotación SoA 2003 (1) (1) For those entities where a sufficiently strong statistic is not yet available to support the actuarial bases, the SoA2003 table is used as a reference. With this table, the probability of permanence of personnel in the entity is established, modified according to the population factor of each benefit.
Disclosure of sensitivity analysis for actuarial assumptions [text block]	The sensitivity analysis for post-employment and long-term benefits liabilities due to defined benefits plans to different actuarial and financial variables is shown below, maintaining other variables at constant values (increase or decrease 0.5%): At December 31, 2017 Post-Employment Benefits Long-Term Benefits Discount interest Ps. 910 Ps. 482 Salaries growth rate 492 581 Retirement growth rate 855 N/A
Disclosure of information about maturity profile of defined benefit obligation [text block]	Future benefit payments projected, reflecting services, as the case may be, are expected to be paid as follows: Year Payments for Post- Payments for Long- 2018 66,310 34,520 2019 59,130 35,659 2020 58,545 34,883 2021 59,199 30,143 2022 58,250 29,821 Years 2023–2027 270,420 141,937

PROVISIONS FOR LEGAL AND OTHE67

PROVISIONS FOR LEGAL AND OTHERS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of provisions for legal and others [Abstract]
Disclosure of other provisions [text block]	Roll-forward of legal provisions during the years ended on December 31, 2017 and 2016 are as follows: For Legal Other Provisions Total Provisions Balance as of December 31, 2014 Ps. 185,656 Ps. 558,997 Ps. 744,653 Provisions increase during the year 13,406 72,032 85,438 Use of provisions (27,816 ) (60,085 ) (87,901 ) Amounts reversed due to provisions not utilized (22,932 ) (21,033 ) (43,965 ) Financial cost - (1,284 ) (1,284 ) Variations in exchange in foreing currency - 195 195 Reclassification - (96,909 ) (96,909 ) Balance as of December 31, 2015 Ps. 148,314 Ps. 451,913 Ps. 600,227 Provisions increase during the year 32,405 363,211 395,616 Use of provisions (13,143 ) (319,592 ) (332,735 ) Amounts reversed due to provisions not utilized (12,938 ) (30,249 ) (43,187 ) Reclassifications 1,111 (676 ) 435 Balance as of December 31, 2016 Ps. 155,749 Ps. 464,607 Ps. 620,356 Provisions increase during the year 32,670 222,349 255,019 Use of provisions (15,012 ) (117,643 ) (132,655 ) Amounts reversed due to provisions not utilized (7,870 ) (42,459 ) (50,329 ) Reclassifications (184 ) 408 224 Balance as of December 31, 2017 Ps. 165,353 Ps. 527,262 Ps. 692,615

OTHER LIABILITIES (Tables)

OTHER LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of accounts Payable and other liabilities [Abstract]
Disclosure of accrued expenses and other liabilities [text block]	Accounts payable and other liabilities comprise the following: Items December 31, 2017 December 31, 2016 Suppliers and services payable Ps. 1,818,103 Ps. 1,609,361 Cashier checks 697,575 802,270 Dividends payable 590,040 644,733 Non-financial liabilities 500,209 580,842 Withholdings taxes and labor contributions 456,411 496,437 Commissions and fees 399,155 197,322 Collection service 285,017 235,325 Collection on behalf of third parties 272,206 256,035 Affiliate establishments 248,064 194,221 Canceled accounts 81,841 28,649 Tax levies 73,696 72,790 Checks drawn and not paid 39,624 41,093 Financial transactions tax 37,042 42,110 Insurance payables 32,410 29,962 Promissory buyers 24,049 27,819 Contributions and affiliations 23,173 28,380 Leases 10,912 8,054 Cash Surplus 9,272 8,081 Deferred credits 1,012 1,051 Compensation to customers 778 1,151 Other liabilities 634,877 651,506 Total Ps. 6,235,466 Ps. 5,957,192

CONTROLLING INTEREST EQUITY (Ta

CONTROLLING INTEREST EQUITY (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of controlling interest equity [Abstract]
Disclosure of classes of share capital [text block]	Authorized, issued and outstanding shares as of December 31, 2017 and 2016 consisted of the following: December 31, 2017 December 31, 2016 Authorized shares 120,000,000,000 120,000,000,000 Subscribed fully paid shares 22,281,017,159 22,281,017,159 Total outstanding shares 22,281,017,159 22,281,017,159 The outstanding shares are as follows: Common voting shares (1) 15,173,180,765 15,254,876,823 Preferred non-voting shares (1) 7,107,836,394 7,026,140,336 (1) Since 2011, Grupo Aval allows its shareholders to convert their common shares into preferred shares. For the years ended December 31, 2017 and 2016, 81,696,058 and 12,086,836 common shares were converted into preferred shares, respectively. Preferred shares have the right to receive a preferential minimum dividend of one Colombian peso (Ps. 1) per semester per share. This preferential minimum dividend is only applicable when dividends declared for common shares are less than one Colombian peso (Ps. 1). Preferential minimum dividends are not cumulative.
Disclosure of reserves within equity [text block]	As of December 31, 2017, and December 31, 2016 the appropriation of retained earnings is as follows: December 31, 2017 December 31, 2016 Retained earnings Ps. 1,829,515 Ps. 919,601 Legal reserve 11,140 11,140 Statutory and voluntary reserves 5,333,763 5,591,387 Ps. 7,174,418 Ps. 6,522,128
Disclosure of dividends [text block]	The dividends are decreed and paid to shareholders based on unconsolidated net income under Colombian IFRS for the immediately preceding semester: On October 25, 2016, The General Meeting of Shareholders of Grupo Aval approved the amendment of the Company's by-laws in order to present the financial statements of the Company for Colombian purpose on an annualized basis for the period between the 1st of January and the 31st of December of each year. Prior to such amendment, the Company's bylaws specified the semi-annual presentation of local financial statements for the periods from January 1st to June 30th and July 1st to December 31st of each year. December 31, 2017 June 30, 2016 December 31, 2015 Net income for the periods ended in 1,053,594 1,258,835 1,086,061 Cash dividends declared Ps. In the general assembly held in March 2017, 58.80 pesos per share payable in twelve installments of 4.90 pesos per share, from April 2017 to March 2018. Ps. 29.40 per share payable in six (6) installments of P.s. 4.90 per share between October 2016 and March 2017 (based on profits from the first half of 2016) Ps. 29.40 per share payable in six (6) installments of P.s. 4.90 per share between April 2016 and September 2016 (based on profits from the second half of 2015) Common shares outstanding 15,240,124,702 15,258,916,143 15,265,983,336 Preferred shares outstanding 7,040,892,457 7,022,101,016 7,015,033,823 Total outstanding shares 22,281,017,159 22,281,017,159 22,281,017,159 Total dividends declared 1,310,124 655,062 655,062
Disclosure of earnings per share [text block]	The following table summarizes the net income per share for the year ended as of December 31, 2017, 2016 and 2015: December 31, December 31, December 31, Net income for the year Ps. 3,162,433 Ps. 3,516,936 Ps. 3,345,686 Less: participation of non- controlling interests (1,200,019 ) (1,377,070 ) (1,304,322 ) Net income attributable to controlling interest 1,962,414 2,139,866 2,041,364 Less: preferred dividends declared - - - Less: Allocation of undistributed earnings to preferred stockholders (1)(2) (622,215 ) (674,042 ) (638,734 ) Net Income allocated to common shareholders for basic and diluted EPS 1,340,199 Ps. 1,465,824 Ps. 1,402,630 Weighted average number of common shares outstanding used in basic EPS calculation (2) 15,216,468,601 15,262,660,115 15,309,380,685 Basic and Diluted earnings per share to common shareholders (pesos) 88.076 96.040 91.619 Basic and Diluted earnings per ADS in pesos (3) 1,761.51 1,920.80 1,832.38 Weighted average of the common and preferred shares used in the calculation of net income for basic shares (common and preferential) 22,281,017,159 22,281,017,159 22,281,017,159 Basic net income of the owners of the parent per share 88.076 96.040 91.619 (1) Based on a weighted average of 7,064,548,558 preferred shares for 2017, 7,018,357,044 preferred shares for 2016 and 6,971,636,474 preferred shares for 2015 (2) Averages based on an end of month number of preferred or common shares (3) Each ADS represents 20 preferred shares
Disclosure of detailed information about components of accumulated other comprehensive income [Table Text Block]	Components of Accumulated Other Comprehensive Income for the years ended December 31, 2017, 2016 and 2015 are as follows: Unrealized gains (losses) on Net investment Hedging Hedging non- Cash flow Foreign Debt securities Equity Investments in Actuarial Income Total Non- Owners of Beginning balance 2015 Ps. 1,366,620 Ps. (870,911 ) Ps. (483,633 ) Ps. (29,257 ) Ps. 26,361 Ps. (298,345 ) Ps. 461,923 Ps. 79,858 Ps. 2,841 Ps. 442,582 Ps. 698,038 Ps. 325,710 Ps. 372,328 Current-period change 2,366,849 (1,683,346 ) (755,431 ) 17,500 24,878 (922,083 ) (6,548 ) 31,964 6,162 1,198,614 278,559 112,758 165,801 Ending balance 2015 Ps. 3,733,469 Ps. (2,554,257 ) Ps. (1,239,064 ) Ps. (11,757 ) Ps. 51,239 Ps. (1,220,428 ) Ps. 455,375 Ps. 111,822 Ps. 9,003 Ps. 1,641,196 Ps. 976,597 Ps. 438,468 Ps. 538,129 Current-period change (475,000 ) 291,506 35,819 17,967 (125,161 ) 948,212 34,509 (20,061 ) (41,228 ) (364,356 ) 302,207 90,719 211,488 Ending balance 2016 Ps. 3,258,469 Ps. (2,262,751 ) Ps. (1,203,245 ) Ps. 6,210 Ps. (73,922 ) Ps. (272,216 ) Ps. 489,884 Ps. 91,761 Ps. (32,225 ) Ps. 1,276,840 Ps. 1,278,804 Ps. 529,187 Ps. 749,617 Current-period change (47,197 ) 16,832 30,568 (2,340 ) (91,497 ) 284,480 57,245 1,128 (100,232 ) (73,617 ) 75,370 38,121 37,249 Ending balance 2017 Ps. 3,211,272 Ps. (2,245,919 ) Ps. (1,172,677 ) Ps. 3,870 Ps. (165,419 ) Ps. 12,264 Ps. 547,129 Ps. 92,889 Ps. (132,457 ) Ps. 1,203,223 Ps. 1,354,174 Ps. 567,308 Ps. 786,866

NON- CONTROLLING INTEREST (Tabl

NON- CONTROLLING INTEREST (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of non-controlling interest [Abstract]
Disclosure of detailed information about financial information of non-controlling interest [Text Block]	The following table includes financial information regarding each subsidiary of Grupo Aval that has significant non controlling interests at December 31, 2017 and 2016: December 31, 2017 Entity Country Non- Non-controlling Non-controlling Dividends paid to Corporación Financiera Colombiana S.A. Colombia 55.21 % 3,448,933 462,137 (340,381 ) Banco Bogotá S.A. Colombia 31.26 % 5,395,664 619,515 (322,985 ) Banco de Occidente S.A. Colombia 27.73 % 256,858 65,941 (84,339 ) Banco Popular S.A. Colombia 6.26 % 184,126 25,163 (6,690 ) Banco Comercial AV Villas S.A. Colombia 20.13 % 298,651 27,263 (14,353 ) Total Ps. 9,584,231 Ps. 1,200,019 Ps. (768,748 ) December 31, 2016 Entity Country Non- Non-controlling Non-controlling Dividends paid to Corporación Financiera Colombiana S.A. Colombia 55.51 % 3,154,158 590,036 (294,376 ) Banco Bogotá S.A. Colombia 31.26 % 4,882,747 685,073 (332,460 ) Banco de Occidente S.A. Colombia 27.73 % 568,263 53,256 (83,166 ) Banco Popular S.A. Colombia 6.26 % 165,150 12,347 (9,529 ) Banco Comercial AV Villas S.A. Colombia 20.13 % 287,351 36,358 (7,668 ) Total Ps. 9,057,669 Ps. 1,377,070 Ps. (727,199 )
Disclosure of detailed information about subsidiary that has significant non controlling interests [Text Block]	The following table includes information regarding each subsidiary of Grupo Aval that has significant non- controlling interests to December 31, 2017 and 2016: December 31, 2017 Entity Assets Liabilities Total Income Net Income OCI Cash Flow from Corporación Financiera Colombiana S.A. 21,115,000 15,872,265 2,313,589 563,553 615,754 3,428,076 Banco Bogotá S.A. 149,389,133 131,197,065 16,396,415 2,132,951 880,565 1,571,203 Banco de Occidente S.A. 37,746,874 33,342,596 4,132,220 377,686 187,037 797,598 Banco Popular S.A. 22,322,103 19,651,056 2,537,768 205,694 153,208 756,955 Banco Comercial AV Villas S.A. 12,318,124 10,853,638 1,645,948 137,695 788 (1,295,251 ) December 31, 2016 Entity Assets Liabilities Total Income Net Income OCI Cash Flow from Corporación Financiera Colombiana S.A. 20,504,644 15,604,999 2,135,834 671,336 537,304 1,378,419 Banco Bogotá S.A. (*) 141,430,749 124,192,566 18,141,612 4,432,026 970,007 313,112 Banco de Occidente S.A. 35,568,507 31,177,321 4,054,750 627,993 242,389 (402,394 ) Banco Popular S.A. 20,731,144 18,052,231 2,478,501 181,075 278,374 (106,977 ) Banco Comercial AV Villas S.A. 12,466,634 11,063,550 1,554,428 179,550 (19,599 ) 216,083 (*) Includes Ps. 2,208,053 related to the effect of the deconsolidation of Corficolombiana, refer to Note 1 for more information.

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Commitments and Contingencies [Abstract]
Disclosure of Detailed Information About Commitments In Unused Lines of Credit [Text Block]	Commitments in unused lines of credit December 31, 2017 December 31, 2016 Notional Fair Notional Fair Guarantees Ps. 3,495,921 Ps. 58,936 Ps. 3,510,546 Ps. 61,030 Unused letters of credit 1,177,697 10,314 1,084,589 4,569 Unused limits of overdrafts 75,225 - 128,621 - Unused credit card limits 18,025,620 - 17,383,743 - Other 4,448,775 - 5,480,222 - Total Ps. 27,223,238 Ps. 69,250 Ps. 27,587,721 Ps. 65,599
Disclosure of Detailed Information About Credit Commitments by Currency [Text Block]	Following is the detail of the credit commitments by type of currency: December 31, December 31, Colombian Pesos Ps. 10,271,676 Ps. 13,608,215 U.S. dollars 16,589,399 13,626,359 Euro 85,887 37,263 Other 276,276 315,884 Total Ps. 27,223,238 Ps. 27,587,721
Disclosure of finance lease and operating lease by lessee [text block]	December 31, December 31, Up to one year Ps. 246,373 Ps. 200,796 Greater than one year and up to five years 526,557 544,148 More than five years 233,239 309,696 Total Ps. 1,006,169 Ps. 1,054,640

INCOME (EXPENSES) COMMISSIONS A

INCOME (EXPENSES) COMMISSIONS AND FEES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Income or Expenses Commissions And Fees [Abstract]
Disclosure of detailed information about Fees and commissions [Text Block]	Below is a detail of the expenses for commissions and fees for the years ended as of December 31, 2017, 2016 and 2015: Income from commissions and fees December 31, December 31, December 31, Commissions on banking services Ps. 2,567,704 Ps. 2,436,692 Ps. 1,751,527 Fees on credit cards 1,112,319 1,034,763 1,223,189 Pension and severance fund management 926,771 824,089 787,692 Trust activities 311,837 275,719 233,892 Storage services 169,815 186,068 167,323 Commissions on drafts, checks and checkbooks 60,768 67,832 71,294 Office network services 42,639 43,508 39,709 Other commissions 10,272 10,516 9,607 Total Ps. 5,202,125 Ps. 4,879,187 Ps. 4,284,233 Commissions and Fees Expenses December 31, December 31, December 31, Banking Services Ps. (332,811 ) Ps. (318,672 ) Ps. (288,303 ) Sales and Services Commissions (119,987 ) (99,659 ) (90,202 ) Affiliations to Pension Funds (74,531 ) (68,454 ) (67,854 ) Offices Network Services (29,874 ) (33,404 ) (34,437 ) Information Processing Services of Operators (23,039 ) (20,963 ) (18,273 ) Collection Service of Contributions to Financial Entities (5,618 ) (6,084 ) (4,962 ) Fiduciary Businesses (41 ) (256 ) (238 ) Banks Guarantees (88 ) (87 ) (131 ) Credit Cards (2 ) (14 ) (110 ) Other (37,123 ) (71,935 ) (117,436 ) Total Ps. (623,114 ) Ps. (619,528 ) Ps. (621,946 ) Net commission and fee income 4,579,011 4,259,659 3,662,287

NET TRADING INCOME (Tables)

NET TRADING INCOME (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Net Trading Income [Abstract]
Disclosure of detailed information about net trading income [Text Block]	Net trading income includes income from client driven trading activities primarily conducted in markets, including foreign Exchange, Credit, Rates and Equities trading, as follows: December December December Trading investment income (1) Fixed income securities Ps. 218,994 Ps. 369,184 Ps. 143,179 Equities 177,448 127,431 41,997 Total trading investment income Ps. 396,442 Ps. 496,615 Ps. 185,176 Derivatives income Net income (loss) on financial derivatives (2) Ps. (75,224 ) Ps. 10,593 (156,820 ) Other trading income (3) 240,144 217,490 216,843 Total derivatives income Ps. 164,920 Ps. 228,083 Ps. 60,023 Total net trading income Ps. 561,362 Ps. 724,698 Ps. 245,199 (1) Includes net trading income from investment securities held for trading, that reflects the interest from investment in debt securities, gains/losses from mark-to-market valuation from investment in equity and debt securities and net income from trading activities. (2) Includes net trading income from derivatives, which reflects the gains/losses from mark-to-market valuation on trading derivatives. (3) Includes gains/losses from: (i) Net changes in the valuation of hedging derivatives from mark-to-market valuations from unhedged , (ii) the ineffective portion of the hedge, (iii) Transfers of due hedging derivatives from OCI to the statement of income.

OTHER INCOME AND EXPENSE (Table

OTHER INCOME AND EXPENSE (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Other income and expense [Abstract]
Disclosure of general and administrative expense [text block]	Below is a detail of the other income and expense in the years ended December 31, 2017, 2016 and 2015: Other Income December 31, December 31, December 31, Income from non-financial sector entities (*) Ps. 757,023 Ps. 929,294 Ps. 838,578 Foreign exchange gains (losses), net 424,483 517,902 457,904 Share of profit of equity accounted investees, net of tax 171,964 140,765 230,398 Net gain on sale of debt and equity securities 51,712 210,373 79,233 Dividends 50,439 28,027 33,611 Gain on the sale of non-current assets held for sale 13,568 28,392 26,211 Other income 439,579 750,648 723,361 Total Ps. 1,908,768 Ps. 2,605,401 Ps. 2,389,296 Other Expense December 31, December 31, December 31, Personnel expenses Ps. 3,671,117 Ps. 3,531,087 Ps. 3,111,306 Taxes and fees 731,316 633,260 557,046 Depreciation and amortization 521,408 471,608 488,212 Consultancy, audit and other fees 460,978 355,590 282,181 Affiliation contributions and transfers 429,825 428,581 349,961 Wealth tax (**) 101,988 267,627 303,193 Leases (Rent) 431,507 440,777 396,922 Maintenance and repairs 392,271 317,170 209,804 Insurance 351,745 316,852 282,452 Markenting 314,657 344,423 299,281 Warehouse services 277,849 288,491 276,343 Transportation services 166,429 160,002 150,866 Cleaning and security services 131,451 138,693 135,299 Outsoursing services 128,656 184,330 131,236 Supplies and stationary 82,113 23,722 44,514 Electronic data processing 73,872 81,682 66,813 Adaptation and installation 62,809 67,938 57,566 Travel expenses 48,193 54,275 49,876 Other 450,652 413,665 416,244 Total Ps. 8,828,836 Ps. 8,519,773 Ps. 7,609,115 (*) Income from the non-financial sector, net results from revenues amounting to Ps 5,792,850, Ps 6,654,622 and Ps 5,198,754 less costs and expenses of Ps 5,035,827, Ps 5,725,328 and Ps 4,360,176 for the years ended 2017, 2016 and 2015, respectively. (**) Grupo Aval and its subsidiaries in Colombia are subject to wealth tax for the years 2015, 2016 and 2017 by Law 1739 of 2014, based on their fiscal net asset value as of January 1, 2015, 2016 and 2017, greater or equal to Ps. 1,000, less the exclusions expressly provided for in the tax regulation, including the net asset value of the shares held in national companies. The wealth tax is calculated at progressive rates depending on the amount of liquid equity, and rates range between 0.20% and 1.15% in 2015, 0.15% and 1% in 2016, and 0.05% and 0.40% in 2017.

ANALYSIS OF OPERATING SEGMENTS

ANALYSIS OF OPERATING SEGMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Analysis of Operating Segment [Abstract]
Disclosure of entity's operating segments [text block]	Following is the detail of the reportable financial information summarized for each segment as of December 31, 2017, 2016 and 2015: Statement of Financial Position December 31, 2017 Banco de Banco de Banco Popular Banco AV Corficolombiana (1) Eliminations and other segments Total Assets Held-for-trading financial assets Ps. 2,590,371 Ps. 584,470 Ps. 217,354 Ps. 328,070 Ps. 1,577,734 Ps. (169,911 ) Ps. 5,128,088 Available-for-sale financial assets 9,949,001 4,526,311 2,172,140 396,128 2,541,683 (971,103 ) 18,614,160 Held-to-maturity Investments 1,367,582 689,023 483,796 274,150 84,488 - 2,899,039 Investments in associates and joint ventures 3,417,702 672,169 10,965 1,597 820,125 (3,879,544 ) 1,043,014 Loans and receivables 104,243,806 27,480,881 17,034,186 9,977,597 2,785,100 (767,275 ) 160,754,295 Other Assets 27,820,671 3,794,020 2,403,662 1,340,582 13,305,870 (564,861 ) 48,099,944 Total Assets Ps. 149,389,133 Ps. 37,746,874 Ps. 22,322,103 Ps. 12,318,124 Ps. 21,115,000 Ps. (6,352,694 ) Ps. 236,538,540 Liabilities Customer Deposits 100,947,244 26,169,109 15,968,499 10,086,106 4,095,692 (2,381,426 ) 154,885,224 Financial Obligations 25,294,735 5,802,728 2,778,675 212,914 8,875,171 2,311,813 45,276,036 Other Liabilities 4,955,086 1,370,759 903,882 554,618 2,901,402 (179,694 ) 10,506,053 Total Liabilities Ps. 131,197,065 Ps. 33,342,596 Ps. 19,651,056 Ps. 10,853,638 Ps. 15,872,265 Ps. (249,307 ) Ps. 210,667,313 Statement of Income for the year 2017 Banco de Banco de Banco Popular Banco AV Corficolombiana (1) Eliminations and other segments Total External Income Interest income Ps. 11,241,897 Ps. 3,450,056 Ps. 2,196,753 Ps. 1,305,784 Ps. 547,028 Ps. 315 Ps. 18,741,833 Commission and fee income 4,187,221 396,658 224,233 250,824 95,086 48,103 5,202,125 Participation in profit or loss associates and joint business 5,847 2,402 2,622 2,043 159,050 - 171,964 Dividends 1,321 370 1,991 1,514 45,243 - 50,439 Other Income 819,797 49,916 94,577 62,642 1,413,594 17,138 2,457,664 Ps. 16,256,083 Ps. 3,899,402 Ps. 2,520,176 Ps. 1,622,807 Ps. 2,260,001 Ps. 65,556 Ps. 26,624,025 Intersegment Income Interest income Ps. 72,910 Ps. 1,818 Ps. 1,047 Ps. 4,797 Ps. 62,097 Ps. (142,669 ) Ps. - Commission and fee income 2,988 5,171 4,133 15,065 1,339 (28,696 ) - Participation in profit or loss associates and joint business 36,782 139,555 (376 ) 132 159 (176,252 ) - Dividends 3,101 5,494 6,810 1,170 1,244 (17,819 ) - Other Income 24,551 80,780 5,978 1,977 (11,251 ) (102,035 ) - 140,332 232,818 17,592 23,141 53,588 (467,471 ) - Total income Ps. 16,396,415 Ps. 4,132,220 Ps. 2,537,768 Ps. 1,645,948 Ps. 2,313,589 Ps. (401,915 ) Ps. 26,624,025 Expenses Interest expense Ps. 4,594,100 Ps. 1,388,144 Ps. 977,441 Ps. 423,069 Ps. 852,501 Ps. (7,556 ) Ps. 8,227,699 Impairment loss on loan and other accounts receivable 2,459,293 993,350 258,926 327,833 79,932 - 4,119,334 Depreciations and amortizations 361,621 69,255 45,417 29,897 5,881 9,337 521,408 Commission and fee expense 351,073 94,089 86,228 108,572 10,772 (27,620 ) 623,114 Administrative Expenses 3,035,346 703,106 520,204 375,522 119,271 (240,301 ) 4,513,148 Other expense 2,491,824 390,812 334,944 180,186 241,636 64,693 3,704,095 Income tax expense 970,207 115,778 108,914 63,174 440,043 54,678 1,752,794 Total Expenses 14,263,464 3,754,534 2,332,074 1,508,253 1,750,036 (146,769 ) 23,461,592 Net income for the year Ps. 2,132,951 Ps. 377,686 Ps. 205,694 Ps. 137,695 Ps. 563,553 Ps. (255,146 ) Ps. 3,162,433 (1) Includes Grupo Aval, Grupo Aval Limited, Grupo Aval International Limited and ATH negocio conjunto. Statement of Financial Position December 31, 2016 Banco de Banco de Banco Popular Banco AV Corficolombiana (2) Eliminations and other segments Total Assets Held-for-trading financial assets Ps. 2,179,411 Ps. 645,607 Ps. 228,176 Ps. 182,936 Ps. 1,499,533 Ps. (141,938 ) Ps. 4,593,725 Available-for-sale financial assets 9,157,156 3,991,626 2,046,466 1,478,433 2,773,149 (1,054,318 ) 18,392,512 Held-to-maturity Investments 1,256,607 542,008 409,131 250,980 111,760 - 2,570,486 Investments in associates and joint ventures 3,354,551 570,782 9,103 - 932,586 (3,720,375 ) 1,146,647 Loans and receivables 97,169,521 26,573,862 16,016,683 8,981,858 3,141,864 (985,056 ) 150,898,732 Other Assets 28,313,503 3,244,622 2,021,585 1,572,427 12,045,752 (726,270 ) 46,471,619 Total Assets Ps. 141,430,749 Ps. 35,568,507 Ps. 20,731,144 Ps. 12,466,634 Ps. 20,504,644 Ps. (6,627,957 ) Ps. 224,073,721 Liabilities Customer Deposits 93,676,674 24,176,056 14,733,350 9,706,084 3,846,793 (2,251,902 ) 143,887,055 Financial Obligations 25,863,311 5,504,607 2,451,314 975,300 9,288,278 1,433,471 45,516,281 Other Liabilities 4,652,581 1,496,658 867,567 382,166 2,469,928 142,263 10,011,163 Total Liabilities Ps. 124,192,566 Ps. 31,177,321 Ps. 18,052,231 Ps. 11,063,550 Ps. 15,604,999 Ps. (676,168 ) Ps. 199,414,499 Statement of Income of the year 2016 (1) Banco de Bogotá S.A. Banco de Banco Popular Banco AV Corficolombiana (1), (2) Eliminations and other segments Total External Income Interest income Ps. 10,481,965 Ps. 3,363,556 Ps. 2,042,878 Ps. 1,193,544 Ps. 442,398 Ps. 22,629 Ps. 17,546,970 Commission and fee income 3,957,774 387,986 219,717 237,762 63,763 12,185 4,879,187 Participation in profit or loss associates and joint business (4,275 ) (484 ) 388 729 144,407 - 140,765 Dividends 1,779 1,150 3,112 2,941 18,973 72 28,027 Other Income 1,336,185 93,860 183,931 99,701 1,647,967 (19,355 ) 3,342,289 Ps. 15,773,428 Ps. 3,846,068 Ps. 2,450,026 Ps. 1,534,677 Ps. 2,317,508 Ps. 15,531 Ps. 25,937,238 Intersegment Income Interest income Ps. 219,995 Ps. 2,893 Ps. 848 Ps. 6,223 Ps. 75,641 Ps. (305,600 ) Ps. - Commission and fee income 900 4,386 2,282 13,170 2,115 (22,853 ) - Participation in profit or loss associates and joint business 116,488 118,109 (1,206 ) (1,923 ) 100 (231,568 ) - Dividends - 20,336 25,293 - 944 (46,573 ) - Other Income 1,996,738 62,959 115 1,610 (79,493 ) (1,981,929 ) - 2,334,121 208,683 27,332 19,080 (693 ) (2,588,523 ) - Total income Ps. 18,107,549 Ps. 4,054,751 Ps. 2,477,358 Ps. 1,553,757 Ps. 2,316,815 Ps. (2,572,992 ) Ps. 25,937,238 Expenses Interest expense Ps. 4,568,469 Ps. 1,455,389 Ps. 995,070 Ps. 451,224 Ps. 947,603 Ps. (25,350 ) Ps. 8,392,405 Impairment loss on loan and other accounts receivable 1,897,902 579,471 229,948 236,434 59,176 1,253 3,004,184 Depreciations and amortizations 352,618 64,252 40,449 24,787 4,513 (15,011 ) 471,608 Commission and fee expense 347,612 99,804 83,857 98,738 8,970 (19,453 ) 619,528 Administrative Expenses 2,943,832 632,153 501,664 324,787 138,626 (131,863 ) 4,409,199 Other expense 2,414,696 363,398 293,930 158,243 104,944 131,258 3,466,469 Income tax expense 1,150,393 232,292 151,365 79,994 381,647 61,218 2,056,909 Total Expenses 13,675,522 3,426,759 2,296,283 1,374,207 1,645,479 2,052 22,420,302 Net income for the year Ps. 4,432,027 Ps. 627,992 Ps. 181,075 Ps. 179,550 Ps. 671,336 Ps. (2,575,044 ) Ps. 3,516,936 (1) Includes Ps. 2,208,053 of income resulting from the desconsolidation of Corficolombiana. (2) Includes Grupo Aval, Grupo Aval Limited and Grupo Aval International Limited. December 31, 2015 Statement of Income Banco de Banco de Banco Popular Banco Av Corficolombiana (1) Eliminations and other segments Total External Income Interest income Ps. 8,511,619 Ps. 2,648,326 Ps. 1,623,643 Ps. 986,384 Ps. 304,109 Ps. 1,517 Ps. 14,075,598 Commission and fee income 3,432,513 394,039 180,302 218,769 58,610 - 4,284,233 Participation in profit or loss associates and joint business 178,243 20,674 2,002 1,523 27,956 - 230,398 Dividends 417 2,638 2,534 1,909 26,113 - 33,611 Other Income 706,302 105,337 162,605 90,644 1,263,449 195,244 2,523,581 Ps. 12,829,094 Ps. 3,171,014 Ps. 1,971,086 Ps. 1,299,229 Ps. 1,680,237 Ps. 196,761 Ps. 21,147,421 Intersegment income Interest income Ps. (32,382 ) Ps. 2,570 Ps. 633 Ps. 2,467 Ps. 30,274 Ps. (3,562 ) Ps. - Commission and fee income 471 4,752 3,091 11,895 2,693 (22,902 ) - Participation in profit or loss associates and joint business (1,439 ) 75,227 (1,229 ) (2,055 ) 178,305 (248,809 ) - Dividends 2,105 25,127 30,989 - - (58,221 ) - Other Income 207,102 75,435 148 1,493 1,482 (285,660 ) - Total Segments income Ps. 175,857 Ps. 183,111 Ps. 33,632 Ps. 13,800 Ps. 212,754 Ps. (619,154 ) Ps. - Total income 13,004,951 3,354,125 2,004,718 1,313,029 1,892,991 (422,393 ) 21,147,421 Banco de Banco de Banco Popular Banco Av Corficolombiana Eliminations and other segments Total Expenses Interest expense Ps. 3,211,117 Ps. 989,836 Ps. 583,151 Ps. 273,944 Ps. 607,989 Ps. 85,422 Ps. 5,751,459 Loan and other accounts receivable 1,323,338 544,143 63,180 188,895 8,468 (274 ) 2,127,750 Depreciations and amortizations 358,517 61,396 39,130 22,571 5,810 788 488,212 Commission and fee expense 327,250 151,038 54,774 85,195 18,013 (14,324 ) 621,946 Administrative Expenses 2,508,967 586,050 465,226 302,765 90,812 (75,034 ) 3,878,786 Other expense 2,168,527 352,957 276,905 155,355 73,262 27,606 3,054,612 Income tax expense 1,047,656 195,606 173,060 108,704 330,889 23,055 1,878,970 Total Expenses 10,945,372 2,881,026 1,655,426 1,137,429 1,135,243 47,239 17,801,735 Net income for the year Ps. 2,059,579 Ps. 473,099 Ps. 349,292 Ps. 175,600 Ps. 757,748 Ps. (469,632 ) Ps. 3,345,686 (1) Includes Grupo Aval, Grupo Aval Limited and Grupo Aval International Limited.
Disclosure of detailed information about revenues for each individual country for which revenues are significant [Text Block]	Grupo Aval’s revenues for each individual country for which revenues are significant, are the following during the years ended December 31, 2017, 2016 and 2015: December 31, 2017 December 31, 2016 December 31, 2015 Colombia Ps. 18,789,167 Ps. 18,548,030 Ps. 15,749,556 Panamá 1,410,766 1,333,843 1,293,132 Costa Rica 2,752,109 2,598,446 1,778,560 Guatemala 1,132,646 1,084,436 1,027,948 Other countries 2,539,337 2,372,483 1,298,225 Total Consolidated Revenues Ps. 26,624,025 Ps. 25,937,238 Ps. 21,147,421
Disclosure of detailed information about non-current assets for each individual country for which revenues are significant [Text Block]	Grupo Aval’s non current assets for each individual country for which non current assets are significant, are as follows as at December 31, 2017 and 2016: December 31, 2017 Own – use Property, plant (*) Intangible assets Colombia Ps. 4,635,899 Ps. 5,868,867 Panamá 203,824 3,657,236 Costa Rica 366,800 89,343 Guatemala 98,778 16,714 Other countries 494,696 1,231,744 Total Ps. 5,799,997 Ps. 10,863,904 (*) see notes 16 to 18. December 31, 2016 Own – use Property, plant (*) Intangible assets Colombia Ps. 4,702,347 Ps. 5,496,699 Panamá 208,727 3,681,756 Costa Rica 376,984 113,009 Guatemala 97,798 14,110 Other countries 513,393 1,059,718 Total Ps. 5,899,249 Ps. 10,365,292 (*) see notes 16 to 18.

OFFSET OF FINANCIAL ASSETS WITH

OFFSET OF FINANCIAL ASSETS WITH FINANCIAL LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Offset of Financial Assets With Financial Liabilities [Abstract]
Disclosure of detailed information about offsetting of financial assets and financial liabilities [Text Block]	Following is a detail of the financial instruments subject to offset contractually required as of December 31, 2017 and 2016: December 31, 2017 Gross Amounts Not Gross Gross Net Amounts Financial Cash Net Offsetting assets Derivatives Ps. 526,148 Ps. (142,495 ) Ps. 383,653 Ps. (2,756 ) Ps. (45,387 ) Ps. 335,510 Repurchase agreements 2,544,676 - 2,544,676 (2,544,676 ) - - Total Ps. 3,070,824 Ps. (142,495 ) Ps. 2,928,329 Ps. (2,547,432 ) Ps. (45,387 ) Ps. 335,510 Gross Amounts Not Gross Amounts of Recognized Liabilities Gross Net Amounts Financial Cash Net Offsetting liabilities Derivatives 446,526 (134,397 ) 312,129 (2,831 ) (33,182 ) 276,116 Repurchase agreements 3,531,531 - 3,531,531 (3,721,846 ) - (190,315 ) Total Ps. 3,978,057 Ps. (134,397 ) Ps. 3,843,660 Ps. (3,724,677 ) Ps. (33,182 ) Ps. 85,801 December 31, 2016 Gross Amounts Not Gross Gross Net Amounts Financial Cash Net Offsetting assets Derivatives Ps. 864,460 Ps. (233,772 ) Ps. 630,688 Ps. (4,890 ) Ps. (40,241 ) Ps. 585,557 Repurchase agreements 711,950 - 711,950 (671,028 ) - 40,922 Total Ps. 1,576,410 Ps. (233,772 ) Ps. 1,342,638 Ps. (675,918 ) Ps. (40,241 ) Ps. 626,479 Gross Amounts Not Gross Amounts of Recognized Liabilities Gross Net Amounts Financial Cash Net Offsetting liabilities Derivatives 942,258 (258,127 ) 684,131 (51,030 ) (90,228 ) 542,873 Repurchase agreements 5,457,370 - 5,457,370 (5,264,105 ) - 193,265 Total Ps. 6,399,628 Ps. (258,127 ) Ps. 6,141,501 Ps. (5,315,135 ) Ps. (90,228 ) Ps. 736,138

UNCONSOLIDATED STRUCTURED ENT77

UNCONSOLIDATED STRUCTURED ENTITIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of unconsolidated structured entities [abstract]
Disclosure of interests in unconsolidated structured entities [text block]	Nature and risks associated with Grupo Aval’s interests in unconsolidated structured entities December 31, 2017 Securitizations Grupo Total Grupo Aval’s interest-assets Investments at fair value through profit or loss Ps. 19,602 Ps. 3,030,499 Ps. 3,050,101 Other account receivables - 37,606 37,606 Total assets in relation to the Gupo Aval’s interests in the unconsolidated structured entities 19,602 3,068,105 3,087,707 Grupo Aval’s maximum exposure Ps. 19,602 Ps. 3,068,105 Ps. 3,087,707 December 31, 2016 Securitizations Grupo Total Grupo Aval’s interest-assets Investments at fair value through profit or loss Ps. 27,377 Ps. 2,719,217 Ps. 2,746,594 Other account receivables - 45,489 45,489 Total assets in relation to the Gupo Aval’s interests in the unconsolidated structured entities 27,377 2,764,706 2,792,083 Grupo Aval’s maximum exposure Ps. 27,377 Ps. 2,764,706 Ps. 2,792,083

TRANSFERS OF FINANCIAL ASSETS (

TRANSFERS OF FINANCIAL ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of transfers of financial assets [Abstract]
Disclosure of continuing involvement in derecognised financial assets [text block]	The table below explain in detail the assets at December 31, 2017, 2016 and 2015 that represent the continuing involvement of Grupo Aval with the accounts receivable transferred and revenue obtained during the collecting process of such loans. At the end of the year December 31, December 31, December 31, Financial assets (1) Ps. 19,602 Ps. 27,377 Ps. 38,975 Income for commission and fees Ps. 136 Ps. 96 Ps. 359 (1) Includes investments held for trading through profit or loss and available-for-sale investments.

RELATED PARTIES (Tables)

RELATED PARTIES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Related Parties [Abstract]
Disclosure of detailed information about balances with related parties [Text Block]	Balances as of December 31, 2017 and 2016, with related parties, are detailed in the following tables: Individuals Entity December 31, 2017 Mr. Key Associates Entities Entities Assets Cash and equivalents Ps. - Ps. - Ps. 11 Ps. - Ps. 67 Financial assets in investments - - 910,310 1,249 - Financial assets in credit operations 3,066 10,665 1,492,067 1,301,697 3,385 Accounts receivable 11 33 59,588 4,421 - Other assets - - 156,636 3,661 18 Liabilities Deposits Ps. 21,257 Ps. 20,192 Ps. 2,535,339 Ps. 1,566,160 Ps. 1,275 Accounts payable 103 700 15,353 322,275 18,671 Financial obligations 4 10 16,435 1,249 - Other liabilities - 4 7,424 49 - Individuals Entity December 31, 2016 Mr. Key Associates Entities Entities Assets Cash and equivalents Ps. - Ps. - Ps. - Ps. - Ps. - Financial assets in investments - - 157,427 - - Financial assets in credit operations 3,897 9,520 1,809,972 1,276,534 24,695 Accounts receivable 3 28 157,725 8,781 125,532 Other assets - 1 41,168 30,068 - Liabilities Deposits Ps. 100,787 Ps. 39,431 Ps. 2,610,620 Ps. 446,802 Ps. 588 Accounts payable 73 582 16,215 641,363 37,831 Financial obligations 3 308 9,445 - - Other liabilities - - 1,984 3,982 -
Disclosure of transactions between related parties [text block]	Transactions during the years ended as of December 31, 2017, 2016 and 2015, with related parties are as follows: a. Profit or loss Individuals Entity December 31, 2017 Mr. Key Associates Entities Entities Income Interest income Ps. 164 757 155,690 123,671 543 Fee income and commissions 5 48 26,249 57,180 - Leases - - 321 301 - Other income 4 59 236,871 6,391 - Expenses Financial expenses 243 1,197 129,335 30,431 6 Fee expenses and commissions 4 1,510 24,039 3,276 1 Operating expenses - 9,706 3,572 1,892 113 Other expenses - 1,635 32,691 34,400 - Individuals Entity December 31, 2016 Mr. Key Associates Entities Entities Income Interest income Ps. 28 321 81,646 64,299 789 Fee income and commissions 4 28 12,717 33,659 - Leases - - 66 290 30 Other income 440 - 171,405 2,957 9.915 Expenses Financial expenses 84 656 88,800 19,064 - Fee expenses and commissions 333 931 15,451 2,674 143 Operating expenses - 5,588 75 2,060 1 Other expenses 11 1,390 193,762 15,159 811 Individuals Entity December 31, 2015 Mr. Key Associates Entities Entities Income Interest income Ps. 84 379 66,562 23,506 1,122 Fee income and commissions 3 28 6,471 26,775 - Leases - - 278 262 19 Other income 2 80 190,571 2,423 5,786 Expenses Financial expenses 163 209 324 18,001 - Fee expenses and commissions 2 1,327 13,597 1,227 8 Operating expenses - 8,288 114 1,963 - Other expenses 5 154 71,759 27,916 60
Disclosure of information about key management personnel [text block]	The compensation received by the key personnel of the management comprises the following: Years ended as of Items December December December Salaries Ps. 17,073 Ps. 15,731 Ps. 14,271 Short term benefits for employees 3,167 10,664 12,282 Total Ps. 20,240 Ps. 26,395 Ps. 26,553

SUBSEQUENT EVENTS (Tables)

SUBSEQUENT EVENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Events after reporting period [Abstract]
Disclosure of detailed information about dividend declaration [Text Block]	At the General Meeting of Shareholders that took place on March 23, 2018, it was declared a dividend of Ps. 4.00 per month for the preferred and common shares, during period of twelve-month between April, 2018 and March 2019, for a total dividend of Ps. 1,069,489 according to the following: Net income for period ended December 31, 2017 included in the unconsolidated financial statements of Grupo Aval 2,001,178 Occasional reserve release at the disposal of the General Meeting of Shareholders 5,333,761 Total Income available for disposal of the General Meeting of Shareholders 7,334,939 Cash Dividends Ps. 48 per share payable in twelve monthly installments of Ps.4.00 per share, from April, 2018 to March, 2019. Common shares outstanding 15,170,666,914 Preferred shares outstanding 7,110,350,245 Total shares outstanding 22,281,017,159 Total dividends declared Ps. 1,069,489 To Occasional reserve at the disposal of General Meeting of Shareholders 6,265,450

PARENT COMPANY INFORMATION (Tab

PARENT COMPANY INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of parent company information [Abstract]
Disclosure of detailed information about Condensed separate Statement of Financial Position [Text Block]	Condensed separate Statement of Financial Position December 31, 2017 2016 Current Assets Cash and cash equivalents Ps. 35,478 Ps. 47,280 Held for trading securities 453 4,980 Accounts receivable from related parties 274,323 260,445 Other assets 513 17,759 Total current assets Ps. 310,767 Ps. 330,464 Non current Assets Investments in subsidiaries 18,589,623 17,529,893 Property plant and equipment 2,851 3,170 Total non current assets Ps. 18,592,474 Ps. 17,533,063 Total assets Ps. 18,903,241 Ps. 17,863,527 Current liabilities Borrowings at amortized cost 290,101 370,349 Outstanding bonds at amortized cost 5,725 6,701 Accounts payable 440,318 430,279 Other non-financial liabilities 1,233 1,234 Total current liabilities Ps. 737,377 Ps. 808,563 Long-term liabilities Borrowings at amortized cost 253,503 365,605 Outstanding bonds 1,104,080 704,080 Deferred tax liabilities 33 - Total non current liabilities Ps. 1,357,616 Ps. 1,069,685 Total liabilities Ps. 2,094,993 Ps. 1,878,248 Equity Shareholders’ equity 16,808,248 15,985,279 Total liabilities and shareholders’ equity Ps. 18,903,241 Ps. 17,863,527
Disclosure of detailed information about Condensed separate Statement of Income [Text Block]	Condensed separate Statement of Income December 31, December 31, December 31, Operating revenue Equity method income, net 2,005,155 2,330,814 2,331,965 Other revenue from ordinary activities 234,502 77,387 75,262 Total operating revenue Ps. 2,239,657 Ps. 2,408,201 Ps. 2,407,227 Expenses, net Administrative expenses 89,823 98,130 79,908 Other expenses 274 168 337 Gains (losses) from exchange differences 98 (1,085 ) (29,760 ) Operating income Ps. 2,149,658 Ps. 2,308,818 Ps. 2,297,222 Financial expenses 133,171 125,585 68,512 Net income before taxes 2,016,487 2,183,233 2,228,710 Income tax expense 51,568 5,620 6,571 Net income Ps. 1,964,919 Ps. 2,177,613 Ps. 2,222,139
Disclosure of detailed information about Condensed separate Cash flow [Text Block]	Condensed separate Cash flow December 31, December 31, December Net income Ps. 1,964,919 Ps. 2,177,613 Ps. 2,222,139 Adjustments to reconcile net income to net cash used by operating activities (867,042 ) (1,726,296 ) (1,470,593 ) Net cash provided by operating activities 1,097,877 451,317 751,546 Net cash provided (used in) by investing activities (8,830 ) (55,374 ) 192,801 Net cash (used in) provided by financing activities (1,100,849 ) (360,827 ) (974,642 ) Increase (decrease) in cash and cash equivalents (11,802 ) 35,116 (30,295 ) Cash and cash equivalents at beginning of year 47,280 12,164 42,459 Cash and cash equivalents at end of year Ps. 35,478 Ps. 47,280 Ps. 12,164
Disclosure of subsidiaries [text block]	Investment in subsidiaries as of December 31, 2017 and 2016 comprise the following: December 31, 2017 December 31, 2016 Subsidiary Economic Book Economic Book Banco de Bogotá S.A. 68.74 % Ps. 11,000,669 68.74 % Ps. 10,331,548 Banco de Occidente S.A. 72.27 % 3,174,228 72.27 % 3,089,717 Banco Comercial AV Villas S.A. 79.87 % 1,190,740 79.87 % 1,139,881 Banco Popular S.A. 93.74 % 2,710,218 93.74 % 2,624,196 Corporación Financiera Colombiana S.A. 44.79 % 504,962 44.49 % 472,466 Sociedad Administradora de Fondos de Pensiones y Cesantías Porvenir S.A. 75.69 % 401,341 75.69 % 341,112 Grupo Aval Limited 100.00 % (315,227 ) 100.00 % (316,553 ) Grupo Aval International Limited 100.00 % (77,308 ) 100.00 % (152,474 ) Ps. 18,589,623 Ps. 17,529,893
Disclosure of detailed information about Outstanding bonds [Text Block]	Bonds at December 31, 2017 and 2016 comprise the following: Amounts outstanding Issuance date Tranches Maturity Coupon rate 2017 2016 June, 2017 Ps. 100,000 June, 2020 IPC + 2.69% Ps. 100,000 Ps. - June, 2017 300,000 June, 2042 IPC + 3.99% 300,000 - November, 2016 93,000 November, 2026 IPC + 3.86% 93,000 93,000 November, 2016 207,000 November, 2036 IPC + 4.15% 207,000 207,000 December, 2009 279,560 December, 2019 IPC + 4.84% 279,560 279,560 December, 2009 124,520 December, 2024 IPC + 5.20% 124,520 124,520 Total Bonds Ps. 1,104,080 Ps. 1,104,080 Ps. 704,080
Disclosure of detailed information about scheduled maturities of bonds [Text Block]	The scheduled maturities of bonds as of December 31, 2017 are as follows Period Amount 2019 279,560 2020 and thereafter 824,520 Total Ps. 1,104,080

REPORTING ENTITY (Details)

REPORTING ENTITY (Details)		6 Months Ended	12 Months Ended
		Jun. 21, 2016	Dec. 31, 2017
Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary		58.49%	68.74%
Banco de Occidente S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary			72.27%
Banco Popular S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary			93.74%
Banco Comercial AV Villas S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary			79.89%
Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary			58.49%
Porvenir S.A. and its subsidiary [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Management of pension and severance funds.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			75.69%
Almaviva S.A. and its subsidiary [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Logistics services.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			95.81%
Proportion of ownership interest in subsidiary			65.85%
Leasing Bogota Panama S.A. [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary	[1]		Holding company
Country of incorporation of subsidiary			Panamá, Republic of Panamá
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			68.74%
Banco de Bogota Panama S.A. [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Commercial banking services.
Country of incorporation of subsidiary			Panamá, Republic of Panamá
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			68.74%
BAC Credomatic Inc. [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Holding company in charge of managing the banking and related subsidiaries in Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua and Panamá, among others. (Subsidiary of Leasing Bogotá Panamá S.A.).
Country of incorporation of subsidiary			Panamá, Republic of Panamá
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			68.74%
Fiduciaria de Occidente S.A. [Member] | Banco de Occidente S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Management of trust funds.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			99.99%
Proportion of ownership interest in subsidiary			71.05%
Banco de Occidente Panama. S.A. [Member] | Banco de Occidente S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Commercial banking services.
Country of incorporation of subsidiary			Panamá, Republic of Panamá
Proportion of voting rights held in subsidiary			95.00%
Proportion of ownership interest in subsidiary			68.66%
Occidental Bank Barbados Ltd. [Member] | Banco de Occidente S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Commercial banking services.
Country of incorporation of subsidiary			Barbados
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			72.27%
Fiduciaria Popular S.A. [Member] | Banco Popular S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Management of trust funds.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			94.85%
Proportion of ownership interest in subsidiary			88.91%
Alpopular S.A. [Member] | Banco Popular S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Conservation and custody of documents; transportation of products at national and international levels.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			71.10%
Proportion of ownership interest in subsidiary			66.65%
A Toda Hora S.A. ATH [Member] | Banco Comercial AV Villas S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			ATM network services and maintenance and software development
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			78.90%
Fiduciaria Corficolombiana S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Trust services
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			44.79%
Leasing Corficolombiana S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Financial services
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			44.79%
Banco Corficolombiana Panama S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Commercial banking services.
Country of incorporation of subsidiary			Panamá, Republic of Panamá
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			44.79%
Casa de Bolsa S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Securities brokerage and securities funds management.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			97.30%
Proportion of ownership interest in subsidiary			63.84%
Hoteles Estelar S. A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Construction and operation of hotels, directly owned by third parties, in Colombia and abroad.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			84.96%
Proportion of ownership interest in subsidiary			38.05%
Estudios y Proyectos del Sol S.A.S. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Infrastructure projects.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			44.79%
Pizano S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Timber production and transformation, industrial products manufacturing, construction supplies production.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			59.38%
Proportion of ownership interest in subsidiary			31.27%
Organizacion Pajonales S. A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Investment and promotion of agricultural, livestock, forestry and agro industrial companies.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			98.67%
Proportion of ownership interest in subsidiary			44.19%
Promigas S.A. E.S.P. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Transportation and distribution of natural gas.
Country of incorporation of subsidiary			Barranquilla, Colombia
Proportion of voting rights held in subsidiary			50.23%
Proportion of ownership interest in subsidiary			22.50%
Estudios, Proyectos e Inversiones de los Andes S.A. [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Infrastructure projects.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			99.93%
Proportion of ownership interest in subsidiary			44.76%
Plantaciones Unipalma de los Llanos S.A [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Development, production and sale of african palm products.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			54.53%
Proportion of ownership interest in subsidiary			24.42%
Proyectos de Infraestructura S.A. - PISA [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Road and Infrastructure Concessions.
Country of incorporation of subsidiary			Cali, Colombia
Proportion of voting rights held in subsidiary			88.25%
Proportion of ownership interest in subsidiary			39.53%
Colombiana de Licitaciones y Concesiones S.A.S [Member] | Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Infrastructure projects.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			100.00%
Proportion of ownership interest in subsidiary			44.79%
Fiduciaria Bogota S.A [Member] | Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Principal place of business of subsidiary			Management of trust funds.
Country of incorporation of subsidiary			Bogotá, Colombia
Proportion of voting rights held in subsidiary			94.99%
Proportion of ownership interest in subsidiary			65.29%
[1]	Leasing Bogotá Panamá, has no restrictions for transferring dividends to Colombia.

REPORTING ENTITY (Details Textu

REPORTING ENTITY (Details Textual)	6 Months Ended	12 Months Ended
	Jun. 21, 2016	Dec. 31, 2017
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Description of nature and extent of significant restrictions on transfer of funds to entity		Grupo Aval subsidiaries in Colombia should assign 10% of its profits as legal reserves before distributing any dividends to its shareholders. Domestic financial companies of Group Aval may not grant loans to other companies of Grupo Aval that exceed 10% of its regulatory capital if the loan is unsecured or 25% if it is granted with an acceptable guarantee under the Superintendency of Finance rules. Pursuant to article 2.1.2.1.8 of Decree 2555 of 2010, banks in Colombia have a lending limit of 30% of their regulatory capital with respect to loans granted to financial entities.
Banco de Bogota S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary	58.49%	68.74%
Banco de Occidente S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary		72.27%
Banco Popular S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary		93.74%
Banco Comercial AV Villas S. A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary		79.89%
Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of Consolidated And Separate Financial Statements Explanatory [Line Items]
Proportion of voting rights held in subsidiary		58.49%

BASIS OF PREPARATION OF THE C84

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2017
Buildings [member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	According to appraisals without exceeding 70 years
Office Equipment [Member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	From 3 to 10 years
Machinery [member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	From 5 to 25 years
Computer Equipment [Member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	From 3 to 12 years
Vehicles [Member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	From 5 to 10 years
Bearer plants [member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment	From 25 to 35 years

BASIS OF PREPARATION OF THE C85

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1)	12 Months Ended
	Dec. 31, 2017
Amendments to IAS 12 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IAS 12
Description of nature of impending change in accounting policy	Recognition of Deferred Tax Assets for Unrealized Losses
Date by which application of new IFRS is required	Jan. 1, 2017
Amendments to IAS 7 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IAS 7
Description of nature of impending change in accounting policy	Disclosure Initiative
Date by which application of new IFRS is required	Jan. 1, 2017
Amendments to IFRS 12 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IFRS 12
Description of nature of impending change in accounting policy	Annual improvements 2014-2016 cycle
Date by which application of new IFRS is required	Jan. 1, 2017
Forthcoming requirements [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Forthcoming requirements.
IFRS 9 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	IFRS 9
Description of nature of impending change in accounting policy	Financial Instruments and associated amendments to various other standards
Date by which application of new IFRS is required	Jan. 1, 2018
IFRS 15 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	IFRS 15
Description of nature of impending change in accounting policy	Revenue from contracts with customers
Date by which application of new IFRS is required	Jan. 1, 2018
IFRS 16 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	IFRS 16
Description of nature of impending change in accounting policy	Leases
Date by which application of new IFRS is required	Jan. 1, 2019
Amendments to IFRS 2 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IFRS 2
Description of nature of impending change in accounting policy	Classification and Measurement of Share-based Payment Transactions
Date by which application of new IFRS is required	Jan. 1, 2018
Amendments to IFRS 4 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IFRS 4
Description of nature of impending change in accounting policy	Applying IFRS 9 Financial Instruments with IFRS 4 Insurance Contracts
Date by which application of new IFRS is required	Jan. 1, 2018
Annual improvements 2014-2016 cycle [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Annual improvements 2014-2016 cycle
Description of nature of impending change in accounting policy	Annual improvements 2014-2016 cycle
Date by which application of new IFRS is required	Jan. 1, 2018
Amendments to IAS 40 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IAS 40
Description of nature of impending change in accounting policy	Transfers of Investment Property
Date by which application of new IFRS is required	Jan. 1, 2018
IFRIC 22 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	IFRIC 22
Description of nature of impending change in accounting policy	Foreign Currency Transactions and Advance Consideration
Date by which application of new IFRS is required	Jan. 1, 2018
Amendments to IFRS 10 and IAS 28 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	Amendments to IFRS 10 and IAS 28
Description of nature of impending change in accounting policy	Sale or contribution of assets between an investor and its associate or joint venture
IFRIC 23 [Member]
Disclosure of voluntary change in accounting policy [line items]
Title of new IFRS	IFRIC 23
Description of nature of impending change in accounting policy	Uncertainty over Income Tax Treatments
Date by which application of new IFRS is required	Jan. 1, 2018

BASIS OF PREPARATION OF THE C86

BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) $ in Millions	Jan. 01, 2018COP ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of voluntary change in accounting policy [line items]
Closing foreign exchange rate		2,984	3,000.71	3,149.47
Deferred tax expense (income)	$ 354,367
IFRS 9 [Member]
Disclosure of voluntary change in accounting policy [line items]
Increase (decrease) in fair value measurement, entity's own equity instruments	806,679
IFRS 9 [Member] | Impairment loss expected [Member]
Disclosure of voluntary change in accounting policy [line items]
Increase (decrease) in fair value measurement, entity's own equity instruments	1,212,968
IFRS 9 [Member] | Classification and measurement other than impairment [Member]
Disclosure of voluntary change in accounting policy [line items]
Increase (decrease) in fair value measurement, entity's own equity instruments	603
Deferred tax expense (income)	181
Increase decrease in fair value measurement entitys own equity instruments after tax effect	422
IFRS 9 [Member] | Cost exception for unquoted equity [Member]
Disclosure of voluntary change in accounting policy [line items]
Increase (decrease) in fair value measurement, entity's own equity instruments	65,123
Deferred tax expense (income)	13,623
Increase decrease in fair value measurement entitys own equity instruments after tax effect	51,500
IFRS 9 [Member] | Deferred tax effect [Member]
Disclosure of voluntary change in accounting policy [line items]
Increase (decrease) in fair value measurement, entity's own equity instruments	$ 340,563
Bottom of range [member]
Disclosure of voluntary change in accounting policy [line items]
Proportion of ownership interest in associate		20.00%
Rubber [Member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment		35 Years
African oil palm [Member]
Disclosure of voluntary change in accounting policy [line items]
Useful lives or depreciation rates, property, plant and equipment			25 Years

JUDGEMENTS AND CRITICAL ACCOU87

JUDGEMENTS AND CRITICAL ACCOUNTING ESTIMATES IN APPLYING ACCOUNTING POLICIES (Details) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss identification period [Member] | Financial assets collectively assessed for credit losses [member]
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Increase in provision for loan portfolio impairment due to sensitivity	$ 198,259	$ 189,434	$ 87,869
Probability of default on estimated future cash flows	$ (197,180)	$ (178,529)	$ (102,626)
Sensitivity analysis period ralating to provision for loan portfolio impairment	1 month	1 month	1 month
Loss given default [Member] | Financial assets collectively assessed for credit losses [member]
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Sensitivity analysis ratio ralating to provision for loan portfolio impairment	10.00%	10.00%	10.00%
Increase in provision for loan portfolio impairment due to sensitivity	$ 219,445	$ 199,130	$ 146,631
Probability of default on estimated future cash flows	$ (284,018)	$ (234,327)	$ (163,341)
Probability of default [member] | Financial assets individually assessed for credit losses [member]
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Sensitivity analysis ratio ralating to provision for loan portfolio impairment	10.00%	10.00%	10.00%
Increase in provision for loan portfolio impairment due to sensitivity	$ 447,231	$ 325,866	$ 225,292
Probability of default on estimated future cash flows	$ (264,549)	$ (191,518)	$ (196,350)
Probability of default [member] | Financial assets collectively assessed for credit losses [member]
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Sensitivity analysis ratio ralating to provision for loan portfolio impairment	10.00%	10.00%	10.00%
Increase in provision for loan portfolio impairment due to sensitivity	$ 189,108	$ 176,162	$ 115,401
Probability of default on estimated future cash flows	$ (261,537)	$ (218,154)	$ (157,465)

JUDGEMENTS AND CRITICAL ACCOU88

JUDGEMENTS AND CRITICAL ACCOUNTING ESTIMATES IN APPLYING ACCOUNTING POLICIES (Details Textual) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Impairment loss on financial assets	$ 142	$ 0	[1]	$ 70,411	$ 6,223
Description of historical information about counterparty default rates	In the specific case of loan default, the assigned PD is 100%.	In the specific case of loan default, the assigned PD is 100%.
Description on effect of reclassification of held to maturity investments	If the entire class of held-to-maturity investments is reclassified, the carrying amount in 2017 would increase by Ps. 29,890 (2016 decrease by Ps. 12,153) with a corresponding entry in other comprehensive income.	If the entire class of held-to-maturity investments is reclassified, the carrying amount in 2017 would increase by Ps. 29,890 (2016 decrease by Ps. 12,153) with a corresponding entry in other comprehensive income.
Financial assets at fair value through profit or loss, category [member]
Disclosure Of Accounting Judgements And Estimates Explanatory [Line Items]
Impairment loss on financial assets	$ 124,356			$ 471,619	$ 892,405
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details)

RISK MANAGEMENT (Details) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total financial assets with credit risk		$ 213,376,687	$ 201,454,788
Total exposure to credit risk outside of the statement of financial position		27,223,238	27,587,721
Maximum exposure to credit risk		240,599,925	229,042,509
Cash and cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied	[1]	16,531,811	17,294,457
Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		55,261	128,479
Derivatives Instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		328,392	502,209
Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		17,790,127	17,662,733
Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		2,899,039	2,570,486
Other financial assets at fair value through profit or loss [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		2,282,611	2,072,674
Commercial [member] | Loans and receivables, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk of loans or receivables		99,428,894	93,149,211
Consumer loans [member] | Loans and receivables, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk of loans or receivables		50,382,895	46,927,997
Mortgage [member] | Loans and receivables, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk of loans or receivables		16,151,299	14,683,537
Microcredit [Member] | Loans and receivables, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk of loans or receivables		409,688	399,431
Other Accounts Receivable [Member] | Loans and receivables, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk of loans or receivables		4,466,134	3,719,672
Financial guarantee contracts [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total exposure to credit risk outside of the statement of financial position		3,495,921	3,510,546
Loan commitments [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total exposure to credit risk outside of the statement of financial position		23,727,317	24,077,175
Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum exposure to credit risk, financial instruments to which impairment requirements in IFRS 9 are not applied		$ 2,650,536	$ 2,343,902
[1]	Not including funds in custody by the entity (cash, tellers, vaults), because there is no credit risk regarding Grupo Aval entities.

RISK MANAGEMENT (Details 1)

RISK MANAGEMENT (Details 1) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 93,975,396	$ 88,172,342
Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		359,649	420,973
Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,964,641	14,628,924
Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		14,501,452	13,587,101
Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		434,118	504,920
Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,314,903	2,136,703
Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		9,611,717	10,886,754
Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		8,318,159	4,079,767
Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		9,151,139	9,254,960
Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		8,697,559	8,414,981
Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,044,043	3,072,751
Total gross credit portfolio [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		166,372,776	155,160,176
Microcredit [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		409,688	399,431
Microcredit [Member] | Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		275,701	270,027
Microcredit [Member] | Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,811	5,388
Microcredit [Member] | Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,168	1,373
Microcredit [Member] | Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		101	0
Microcredit [Member] | Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,290	1,659
Microcredit [Member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		23,919	213
Microcredit [Member] | Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		102,698	120,771
Microcredit [Member] | Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Finance Leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	11,166,930	11,075,807
Finance Leases [Member] | Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	52,179	42,964
Finance Leases [Member] | Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	4,803	4,779
Finance Leases [Member] | Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	6,127	6,391
Finance Leases [Member] | Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	120,909	108,571
Finance Leases [Member] | Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	0	0
Finance Leases [Member] | Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	0	0
Finance Leases [Member] | Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	20,452	4,267
Finance Leases [Member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	1,434,905	1,294,955
Finance Leases [Member] | Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	9,151,139	9,254,960
Finance Leases [Member] | Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	364,938	353,179
Finance Leases [Member] | Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	11,478	5,741
Consumer loans [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		50,156,131	46,712,389
Consumer loans [member] | Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		42,566,151	39,350,056
Consumer loans [member] | Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,284	3,145
Consumer loans [member] | Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		62,174	59,206
Consumer loans [member] | Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,248,808	1,155,760
Consumer loans [member] | Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,077	1,779
Consumer loans [member] | Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		141,891	149,516
Consumer loans [member] | Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		5,728,752	5,570,825
Consumer loans [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		366,524	380,125
Consumer loans [member] | Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Consumer loans [member] | Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		36,204	41,526
Consumer loans [member] | Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		266	451
Mortgage [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,103,533	13,781,433
Mortgage [member] | Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,859	3,034
Mortgage [member] | Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Mortgage [member] | Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,025,672	13,746,499
Mortgage [member] | Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,290	4,365
Mortgage [member] | Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Mortgage [member] | Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Mortgage [member] | Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,597	1,587
Mortgage [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		843	130
Mortgage [member] | Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Mortgage [member] | Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		64,250	25,818
Mortgage [member] | Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		22	0
Commercial loans [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		89,536,494	83,191,116
Commercial loans [Member] | Unsecured credits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		51,074,506	48,506,261
Commercial loans [Member] | Loans secured by other banks [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		350,562	413,049
Commercial loans [Member] | Collateralized Mortgages [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		865,857	811,440
Commercial loans [Member] | Other real estate [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		13,126,277	12,317,032
Commercial loans [Member] | Investments in equity instruments [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		433,041	503,141
Commercial loans [Member] | Deposits in cash or cash equivalents [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,172,911	1,987,187
Commercial loans [Member] | Pledges [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,859,626	5,308,416
Commercial loans [Member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,491,968	2,404,344
Commercial loans [Member] | Leased machineries and vehicles [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Commercial loans [Member] | Fiduciary agreements, stand by letters and guarantee funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		8,129,469	7,873,687
Commercial loans [Member] | Pledged income [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 3,032,277	$ 3,066,559
[1]	See Note 11.

RISK MANAGEMENT (Details 2)

RISK MANAGEMENT (Details 2) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 166,372,776	$ 155,160,176
COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		111,212,631	104,551,758
Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		12,006,527	11,685,504
UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,434,079	5,186,759
COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		13,263,755	12,059,749
NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,944,423	3,783,186
HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		5,274,073	4,614,239
EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,920,496	4,461,479
GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		8,461,517	7,782,794
Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		855,275	1,034,708
Microcredit [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		409,688	399,431
Microcredit [Member] | COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		409,688	399,431
Microcredit [Member] | Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Microcredit [Member] | Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Finance Leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	11,166,930	11,075,807
Finance Leases [Member] | COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	10,289,156	10,244,275
Finance Leases [Member] | Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	121,838	127,976
Finance Leases [Member] | UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	0	0
Finance Leases [Member] | COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	712,686	665,281
Finance Leases [Member] | NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	6,052	7,164
Finance Leases [Member] | HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	3,251	3,867
Finance Leases [Member] | EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	9,747	11,977
Finance Leases [Member] | GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	24,200	15,267
Finance Leases [Member] | Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	0	0
Mortgage [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,103,533	13,781,433
Mortgage [member] | COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		5,674,640	4,822,806
Mortgage [member] | Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,154,504	2,067,375
Mortgage [member] | UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		10	16
Mortgage [member] | COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,868,474	3,674,158
Mortgage [member] | NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		403,191	390,003
Mortgage [member] | HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		740,113	720,987
Mortgage [member] | EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		897,404	873,870
Mortgage [member] | GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,365,197	1,232,218
Mortgage [member] | Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		0	0
Consumer loans [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		50,156,131	46,712,389
Consumer loans [member] | COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		32,878,650	30,523,917
Consumer loans [member] | Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,852,539	4,650,419
Consumer loans [member] | UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		736	436
Consumer loans [member] | COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,848,689	4,390,441
Consumer loans [member] | NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,307,042	1,237,205
Consumer loans [member] | HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,736,449	1,597,280
Consumer loans [member] | EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,267,152	2,076,588
Consumer loans [member] | GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,264,791	2,080,065
Consumer loans [member] | Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		83	156,038
Commercial loans [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		89,536,494	83,191,116
Commercial loans [member] | COLOMBIA [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		61,960,497	58,561,329
Commercial loans [member] | Panama [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,877,646	4,839,734
Commercial loans [member] | UNITED STATES
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,433,333	5,186,307
Commercial loans [member] | COSTA RICA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,833,906	3,329,869
Commercial loans [member] | NICARAGUA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,228,138	2,148,814
Commercial loans [member] | HONDURAS
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,794,260	2,292,105
Commercial loans [member] | EL SALVADOR
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,746,193	1,499,044
Commercial loans [member] | GUATEMALA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,807,329	4,455,244
Commercial loans [member] | Other countries [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 855,192	$ 878,670
[1]	See Note 11.

RISK MANAGEMENT (Details 3)

RISK MANAGEMENT (Details 3) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and Receivables, Percentage	100.00%	100.00%
Total gross credit portfolio [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 166,372,776	$ 155,160,176
Agricultural
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 3,940,981	$ 3,734,625
Loans and Receivables, Percentage	2.00%	2.00%
Mining products and oil
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 2,377,188	$ 2,018,219
Loans and Receivables, Percentage	1.00%	1.00%
Food, beverage and tobacco
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 8,165,975	$ 7,273,602
Loans and Receivables, Percentage	5.00%	5.00%
Chemical production
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 5,672,310	$ 5,276,248
Loans and Receivables, Percentage	3.00%	4.00%
Other industrial and manufacturing products
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 4,469,427	$ 4,576,173
Loans and Receivables, Percentage	3.00%	3.00%
Government
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 3,579,838	$ 3,629,849
Loans and Receivables, Percentage	2.00%	2.00%
Construction
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 10,313,655	$ 9,959,536
Loans and Receivables, Percentage	7.00%	7.00%
Trade and tourism
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 2,182,437	$ 2,025,206
Loans and Receivables, Percentage	1.00%	1.00%
Transportation and communications
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 7,566,374	$ 7,814,741
Loans and Receivables, Percentage	5.00%	5.00%
Public services
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 5,421,328	$ 5,160,778
Loans and Receivables, Percentage	3.00%	3.00%
Consumer services
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 70,947,936	$ 66,157,872
Loans and Receivables, Percentage	43.00%	43.00%
Commercial services
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 38,788,363	$ 34,587,323
Loans and Receivables, Percentage	23.00%	22.00%
Other
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	$ 2,946,964	$ 2,946,004
Loans and Receivables, Percentage	2.00%	2.00%

RISK MANAGEMENT (Details 4)

RISK MANAGEMENT (Details 4) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held		$ 12,940,760	$ 13,758,085
Central Government debt instruments held, Percentage		100.00%	100.00%
Total Sovereign Risk		$ 14,331,729	$ 14,371,542
Investment grade [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 11,415,746	$ 12,126,481
Central Government debt instruments held, Percentage	[1]	88.22%	88.14%
Investment grade [Member] | Colombia
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 10,716,568	$ 11,562,492
Central Government debt instruments held, Percentage	[1]	82.81%	84.04%
Investment grade [Member] | Panama
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 617,126	$ 530,055
Central Government debt instruments held, Percentage	[1]	4.78%	3.85%
Investment grade [Member] | USA
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 57,120	$ 24,808
Central Government debt instruments held, Percentage	[1]	0.44%	0.18%
Investment grade [Member] | Mexico
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 0	$ 9,126
Central Government debt instruments held, Percentage	[1]	0.00%	0.07%
Investment grade [Member] | Chile
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[1]	$ 24,932	$ 0
Central Government debt instruments held, Percentage	[1]	0.19%	0.00%
Speculative [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held		$ 1,525,014	$ 1,631,604
Central Government debt instruments held, Percentage		11.78%	11.86%
Central Bank debt instruments held	[2]	$ 1,390,969	$ 613,457
Central Bank debt instruments held, Percentage	[2]	100.00%	100.00%
Speculative [Member] | Argentina
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 0	$ 3,246
Central Government debt instruments held, Percentage	[2]	0.00%	0.02%
Speculative [Member] | Costa Rica
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 1,018,737	$ 951,809
Central Government debt instruments held, Percentage	[2]	7.87%	6.92%
Central Bank debt instruments held	[2]	$ 207,474	$ 124,695
Central Bank debt instruments held, Percentage	[2]	14.92%	20.33%
Speculative [Member] | Honduras
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 372,237	$ 394,184
Central Government debt instruments held, Percentage	[2]	2.88%	2.87%
Central Bank debt instruments held	[2]	$ 158,990	$ 30,891
Central Bank debt instruments held, Percentage	[2]	11.43%	5.04%
Speculative [Member] | El Salvador
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 76,682	$ 85,626
Central Government debt instruments held, Percentage	[2]	0.59%	0.62%
Speculative [Member] | Guatemala
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 56,808	$ 195,876
Central Government debt instruments held, Percentage	[2]	0.44%	1.42%
Central Bank debt instruments held	[2]	$ 876,271	$ 335,900
Central Bank debt instruments held, Percentage	[2]	63.00%	54.76%
Speculative [Member] | Nicaragua
Disclosure Of Financial Risk Management Explanatory [Line Items]
Central Government debt instruments held	[2]	$ 550	$ 863
Central Government debt instruments held, Percentage	[2]	0.00%	0.01%
Central Bank debt instruments held	[2]	$ 148,234	$ 121,971
Central Bank debt instruments held, Percentage	[2]	10.66%	19.87%
[1]	Investment grade includes the risk rating of Fitch Ratings Colombia S.A o F1+ to F3, BRC of Colombia from BRC 1+ to BRC 3 and Standard & Poor’s from A1 to A3.
[2]	Speculative or non-investment grade level includes the risk rating of Fitch Ratings Colombia S.A. from B to E, BRC de Colombia from BRC 4 to BRC 6 and Standard & Poor’s from B1 to D.

RISK MANAGEMENT (Details 5)

RISK MANAGEMENT (Details 5) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 166,372,776	$ 155,160,176
From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		3,921,600	3,639,706
From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		943,214	779,085
From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		489,539	384,086
Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		5,354,353	4,802,877
Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		8,146,220	6,498,218
Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		152,872,203	143,859,081
Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		89,536,494	83,191,116
Commercial | From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,062,814	905,756
Commercial | From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		124,401	109,524
Commercial | From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		91,658	59,929
Commercial | Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,278,873	1,075,209
Commercial | Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		4,255,774	3,335,104
Commercial | Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		84,001,847	78,780,803
Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		50,156,131	46,712,389
Consumer | From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,881,589	1,649,188
Consumer | From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		593,525	508,195
Consumer | From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		295,676	245,185
Consumer | Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,770,790	2,402,568
Consumer | Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,708,335	2,231,476
Consumer | Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		44,677,006	42,078,345
Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,103,533	13,781,433
Mortgage | From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		536,926	525,900
Mortgage | From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		165,971	117,856
Mortgage | From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		69,120	51,894
Mortgage | Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		772,017	695,650
Mortgage | Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		445,347	349,233
Mortgage | Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		13,886,169	12,736,550
Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		409,688	399,431
Microcredit | From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		38,827	44,216
Microcredit | From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		9,285	8,705
Microcredit | From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,230	6,455
Microcredit | Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		54,342	59,376
Microcredit | Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		58,733	55,600
Microcredit | Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		296,613	284,455
Finance Leases
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	11,166,930	11,075,807
Finance Leases | From 1 to 30 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	401,444	514,646
Finance Leases | From 31 to 60 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	50,032	34,805
Finance Leases | From 61 to 90 days [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	26,855	20,623
Finance Leases | Financial assets past due but not impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	478,331	570,074
Finance Leases | Financial assets impaired [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	678,031	526,805
Finance Leases | Current not impaired [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	$ 10,010,568	$ 9,978,928
[1]	See Note 11.

RISK MANAGEMENT (Details 6)

RISK MANAGEMENT (Details 6) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 166,372,776	$ 155,160,176
Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		89,536,494	83,191,116
Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		50,156,131	46,712,389
Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		15,103,533	13,781,433
Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		409,688	399,431
Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables	[1]	11,166,930	11,075,807
“A” Normal Risk | Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		82,217,135	77,930,507
“A” Normal Risk | Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		45,794,015	42,956,173
“A” Normal Risk | Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		14,208,051	13,104,010
“A” Normal Risk | Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		341,194	337,391
“A” Normal Risk | Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		9,874,243	10,136,530
“B” Acceptable Risk | Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,093,079	1,996,137
“B” Acceptable Risk | Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,364,520	1,240,377
“B” Acceptable Risk | Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		324,925	247,334
“B” Acceptable Risk | Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		11,871	11,687
“B” Acceptable Risk | Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		489,323	443,437
“C” Appreciable Risk | Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		2,735,103	1,818,112
“C” Appreciable Risk | Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,232,881	1,169,752
“C” Appreciable Risk | Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		326,237	234,954
“C” Appreciable Risk | Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		6,742	9,432
“C” Appreciable Risk | Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		394,534	206,397
“D” Significant Risk | Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,620,293	910,746
“D” Significant Risk | Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		1,256,089	984,334
“D” Significant Risk | Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		79,707	62,383
“D” Significant Risk | Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		7,342	7,523
“D” Significant Risk | Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		309,726	211,983
“E” Risk of nonrecoverability | Commercial
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		870,884	535,614
“E” Risk of nonrecoverability | Consumer
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		508,626	361,753
“E” Risk of nonrecoverability | Mortgage
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		164,613	132,752
“E” Risk of nonrecoverability | Microcredit
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		42,539	33,398
“E” Risk of nonrecoverability | Financial leasing
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and receivables		$ 99,104	$ 77,460
[1]	See Note 11.

RISK MANAGEMENT (Details 7)

RISK MANAGEMENT (Details 7) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and Receivables, Restructured	$ 3,318,393	$ 3,706,578
Local
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and Receivables, Restructured	2,674,637	3,179,875
Foreign
Disclosure Of Financial Risk Management Explanatory [Line Items]
Loans and Receivables, Restructured	$ 643,756	$ 526,703

RISK MANAGEMENT (Details 8)

RISK MANAGEMENT (Details 8) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Risk Management [Abstract]
Foreclosed assets received	$ 106,030	$ 220,400
Foreclosed assets sold	$ 64,038	$ 44,677

RISK MANAGEMENT (Details 9)

RISK MANAGEMENT (Details 9) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)	[2]	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		$ 16,531,811			$ 17,294,457
Cash held by entity	[1]	5,805,027			4,898,547
Cash and cash equivalents		22,336,838	$ 7,485.5	[2]	22,193,004	$ 7,437.3		$ 22,284,977	$ 17,269,760
Financial assets at fair value through profit or loss, classified as held for trading		5,128,088	1,718.5		4,593,725
Financial assets available-for-sale		18,614,160	6,238	[2]	18,392,512
Held-to-maturity investments		2,899,039	971.5	[2]	2,570,486
Derivative financial assets		328,392	110.1	[2]	502,209
Financial assets at fair value through profit or loss classified as held debt securities		2,650,536	888.2	[2]	2,343,902
Financial assets available for debt securities		17,790,127	$ 5,961.8	[2]	17,662,733
Total financial assets		383,653			630,688
Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		9,391,266			10,978,574
Financial assets at fair value through profit or loss, classified as held for trading		2,377,109			2,109,209
Financial assets available-for-sale		14,049,049			14,268,165
Held-to-maturity investments		2,875,209			2,570,486
Derivative financial assets		312,426			528,823
Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		6,679,084			5,887,086
Financial assets at fair value through profit or loss, classified as held for trading		257,011			234,693
Financial assets available-for-sale		3,705,999			3,271,451
Derivative financial assets		503			248
Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		461,461			428,797
Financial assets at fair value through profit or loss, classified as held for trading		16,416			0
Financial assets available-for-sale		563			98,368
Held-to-maturity investments		23,830			0
Derivative financial assets		70,724			101,617
Default
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets available-for-sale	[3]	34,516			24,749
Central Bank | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		3,820,538			3,598,126
Central Bank | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		5,993,380			5,381,681
Central Bank | Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		1,469			1,724
Financial entities | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		5,570,728			7,338,920
Financial entities | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		685,704			505,405
Financial entities | Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		459,909			426,826
Others | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		0			41,528
Others | Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash equivalents		83			247
Sovereign | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading	[4]	1,231,219			985,455
Financial assets available-for-sale	[4]	10,157,239			11,115,044
Held-to-maturity investments	[4]	27,288			25,981
Sovereign | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading	[4]	92,931			88,095
Financial assets available-for-sale	[4]	1,432,083			1,543,509
Other Public Entities | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading	[5]	70,064			79,789
Financial assets available-for-sale	[6]	662,702			569,312
Held-to-maturity investments	[5]	2,839,286			2,484,078
Corporate | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading		68,286			84,880
Financial assets available-for-sale		148,738			341,099
Held-to-maturity investments		0			1,541
Corporate | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets available-for-sale		274,450			366,482
Corporate | Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading		16,416			0
Financial assets available-for-sale		563			82,663
Corporate | Default
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets available-for-sale	[3]	34,516			24,749
Financial Entities | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading		1,007,540			959,085
Financial assets available-for-sale		2,975,485			2,149,641
Held-to-maturity investments		8,635			0
Financial Entities | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading		129,985			71,871
Financial assets available-for-sale		642,592			822,729
Financial Entities | Without grade or not available
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets available-for-sale		0			15,705
Held-to-maturity investments		23,830			0
Multilaterals | Investment grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets available-for-sale		104,885			93,069
Held-to-maturity investments		0			58,886
Central Banks | Speculative grade
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets at fair value through profit or loss, classified as held for trading		34,095			74,727
Financial assets available-for-sale		$ 1,356,874			$ 538,731
[1]	Cash held by Bank in custody in vaults, ATMs and cash.
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[3]	Includes investments in the Brazilian Telecommunications Company OI S.A. And its subsidiary Telemar Norte Leste S.A., which requested to avail themselves of the judicial protection law after declaring bankruptcy on June 20, 2016.
[4]	A sovereign credit rating considers the risk of Treasury issuer or similar agency (government debt portfolio).
[5]	Derived from operations with government entities; including public administrations in general (plus regional and local).
[6]	Derived from operations with government entities; including public administrations in general (plus regional and local).

RISK MANAGEMENT (Details 10)

RISK MANAGEMENT (Details 10) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	$ 383,653			$ 630,688
Total Liabilities	45,276,036	$ 15,172.9		45,516,281
Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	20,824,316			20,637,323
Total Liabilities	312,129			684,131
Net position	20,512,187			19,953,192
Derivatives [member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	328,392			502,209
Total Liabilities	298,665			640,695
Hedging Derivatives [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	55,261			128,479
Total Liabilities	13,464			43,436
Debt Securities [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	20,440,663			20,006,635
Debt Securities [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	2,650,536			2,343,902
Debt Securities [Member] | Financial assets available-for-sale, category [member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	17,790,127			17,662,733
Derivatives and Hedging [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Total Financial assets	$ 383,653			$ 630,688
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details 11)

RISK MANAGEMENT (Details 11) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 9,928	$ 8,944
Banco Bogota | Measure Trading Risk Method [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 829,846	$ 579,486
Basis points of regulatory capital	109.00%	81.00%
Banco de Occidente | Measure Trading Risk Method [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 184,223	$ 141,794
Basis points of regulatory capital	56.00%	56.00%
Banco Popular | Measure Trading Risk Method [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 125,265	$ 120,572
Basis points of regulatory capital	79.00%	85.00%
Banco AV Villas | Measure Trading Risk Method [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 18,394	$ 89,402
Basis points of regulatory capital	20.00%	130.00%
Corficolombiana | Measure Trading Risk Method [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value	$ 159,214	$ 159,697
Basis points of regulatory capital	9.00%	11.00%

RISK MANAGEMENT (Details 12)

RISK MANAGEMENT (Details 12) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	$ 9,928	$ 8,944
Interest rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	321,121	346,303
Interest rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	174,379	137,221
Interest rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	119,856	118,920
Interest rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	14,206	89,268
Interest rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	144,232	141,553
Exchange rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	304,429	57,160
Exchange rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	7,034	2,029
Exchange rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	3,329	273
Exchange rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,448	7
Exchange rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	4,041	3,263
Shares | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	8,099	6,002
Shares | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Shares | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	946	764
Shares | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Shares | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	10,800	11,975
Mutual funds | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	196,197	170,020
Mutual funds | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,811	2,545
Mutual funds | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,134	615
Mutual funds | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,741	126
Mutual funds | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	140	2,906
VaR Portfolio | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	829,846	579,486
VaR Portfolio | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	184,224	141,794
VaR Portfolio | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	125,265	120,572
VaR Portfolio | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	18,394	89,402
VaR Portfolio | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	159,214	159,697
Bottom of range [member] | Interest rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	309,368	324,908
Bottom of range [member] | Interest rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	140,044	131,840
Bottom of range [member] | Interest rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	103,535	103,097
Bottom of range [member] | Interest rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	12,563	89,066
Bottom of range [member] | Interest rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	81,334	130,771
Bottom of range [member] | Exchange rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	12,424	26,940
Bottom of range [member] | Exchange rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,424	1,488
Bottom of range [member] | Exchange rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	4	17
Bottom of range [member] | Exchange rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	3
Bottom of range [member] | Exchange rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	656	1,263
Bottom of range [member] | Shares | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	7,234	5,090
Bottom of range [member] | Shares | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Bottom of range [member] | Shares | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	945	732
Bottom of range [member] | Shares | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Bottom of range [member] | Shares | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	9,691	8,471
Bottom of range [member] | Mutual funds | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	187,698	149,082
Bottom of range [member] | Mutual funds | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,580	2,545
Bottom of range [member] | Mutual funds | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,019	490
Bottom of range [member] | Mutual funds | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	481	96
Bottom of range [member] | Mutual funds | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	116	373
Bottom of range [member] | VaR Portfolio | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	523,306	550,562
Bottom of range [member] | VaR Portfolio | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	145,108	137,343
Bottom of range [member] | VaR Portfolio | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	105,635	104,583
Bottom of range [member] | VaR Portfolio | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	15,198	89,243
Bottom of range [member] | VaR Portfolio | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	95,312	146,966
Weighted Average [Member] | Interest rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	342,043	496,788
Weighted Average [Member] | Interest rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	162,463	154,398
Weighted Average [Member] | Interest rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	115,033	129,470
Weighted Average [Member] | Interest rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	37,998	100,756
Weighted Average [Member] | Interest rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	104,098	219,143
Weighted Average [Member] | Exchange rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	52,925	37,336
Weighted Average [Member] | Exchange rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	3,119	2,172
Weighted Average [Member] | Exchange rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	662	703
Weighted Average [Member] | Exchange rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	670	307
Weighted Average [Member] | Exchange rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,332	3,799
Weighted Average [Member] | Shares | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	7,068	9,622
Weighted Average [Member] | Shares | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Weighted Average [Member] | Shares | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	965	813
Weighted Average [Member] | Shares | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Weighted Average [Member] | Shares | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	10,601	10,608
Weighted Average [Member] | Mutual funds | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	184,582	160,274
Weighted Average [Member] | Mutual funds | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,702	3,628
Weighted Average [Member] | Mutual funds | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,085	582
Weighted Average [Member] | Mutual funds | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,394	115
Weighted Average [Member] | Mutual funds | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	891	2,140
Weighted Average [Member] | VaR Portfolio | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	586,619	704,020
Weighted Average [Member] | VaR Portfolio | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	168,284	160,199
Weighted Average [Member] | VaR Portfolio | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	117,745	131,567
Weighted Average [Member] | VaR Portfolio | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	40,061	101,178
Weighted Average [Member] | VaR Portfolio | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	117,460	235,689
Top of range [member] | Interest rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	400,828	711,827
Top of range [member] | Interest rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	184,209	172,552
Top of range [member] | Interest rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	122,910	149,375
Top of range [member] | Interest rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	89,381	113,347
Top of range [member] | Interest rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	144,232	282,081
Top of range [member] | Exchange rate | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	304,429	57,160
Top of range [member] | Exchange rate | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	7,034	3,567
Top of range [member] | Exchange rate | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	3,329	2,551
Top of range [member] | Exchange rate | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,572	862
Top of range [member] | Exchange rate | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	4,041	8,730
Top of range [member] | Shares | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	8,099	15,089
Top of range [member] | Shares | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Top of range [member] | Shares | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	967	947
Top of range [member] | Shares | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	0	0
Top of range [member] | Shares | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	11,072	12,295
Top of range [member] | Mutual funds | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	196,197	170,020
Top of range [member] | Mutual funds | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,811	3,898
Top of range [member] | Mutual funds | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	1,203	683
Top of range [member] | Mutual funds | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	6,373	169
Top of range [member] | Mutual funds | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	2,669	3,498
Top of range [member] | VaR Portfolio | Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	829,846	909,405
Top of range [member] | VaR Portfolio | Banco de Occidente S.A. [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	190,502	177,946
Top of range [member] | VaR Portfolio | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	126,486	150,964
Top of range [member] | VaR Portfolio | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	89,960	114,065
Top of range [member] | VaR Portfolio | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Value at risk	$ 159,214	$ 293,983

RISK MANAGEMENT (Details 13)

RISK MANAGEMENT (Details 13) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Investment subject to Regulatory VaR	$ 67,538	$ 60,845
Regulatory VaR	$ 9,928	$ 8,944
Percentage of portfolio	100.00%	100.00%
More than 36 months [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Investment subject to Regulatory VaR	$ 67,538	$ 60,845
Regulatory VaR	$ 9,928	$ 8,944
Percentage of portfolio	100.00%	100.00%

RISK MANAGEMENT (Details 14)

RISK MANAGEMENT (Details 14) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 383,653			$ 630,688
Liabilities	45,276,036	$ 15,172.9	[1]	45,516,281
Foreign Currency Balances [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	86,991,386	22,744		81,513,520	$ 21,458
Liabilities	87,471,548	23,723		82,485,880	22,964
Net financial asset (liability) position	(480,162)	(979)		(972,360)	(1,506)
Foreign Currency Balances [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		6,410			5,717
Liabilities		5,600			4,533
Net financial asset (liability) position		810			1,184
Foreign Currency Balances [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	470,430	134		516,926	172
Foreign Currency Balances [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		24			0
Foreign Currency Balances [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	9,532,417	2,564		8,224,549	2,741
Foreign Currency Balances [Member] | Financial assets available-for-sale, category [member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		631			0
Foreign Currency Balances [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	50,695	17		25,693	9
Foreign Currency Balances [Member] | Held-to-maturity investments, category [member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		0			0
Foreign Currency Balances [Member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	274,691	91		462,278	128
Liabilities	256,865	85		613,376	134
Foreign Currency Balances [Member] | Trading Derivatives [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		1			26
Liabilities		1			70
Foreign Currency Balances [Member] | Financial assets at amortised cost, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	61,817,662	16,217		56,505,459	14,149
Foreign Currency Balances [Member] | Financial assets at amortised cost, category [member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		4,500			4,682
Foreign Currency Balances [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,083,678	161		955,677	318
Foreign Currency Balances [Member] | Other Accounts Receivable [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		202			0
Foreign Currency Balances [Member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	55,261	19		128,479	43
Liabilities	13,464	5		43,436	14
Foreign Currency Balances [Member] | Hedging Derivatives [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		0			0
Liabilities		0			0
Foreign Currency Balances [Member] | Customer deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	58,087,999	14,572		53,014,364	13,214
Foreign Currency Balances [Member] | Customer deposits [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities		4,909			4,463
Foreign Currency Balances [Member] | Financial obligations [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	27,808,291	8,624		27,664,167	9,219
Foreign Currency Balances [Member] | Financial obligations [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities		660			0
Foreign Currency Balances [Member] | Accounts payables [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	1,304,929	437		1,150,537	384
Foreign Currency Balances [Member] | Accounts payables [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities		0			0
Foreign Currency Balances [Member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 13,706,552	3,541		$ 14,694,459	3,898
Foreign Currency Balances [Member] | Cash and cash equivalentss [Member] | Other Currencies [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets		$ 1,052			$ 1,009
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details 15)

RISK MANAGEMENT (Details 15) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 383,653			$ 630,688
Liabilities	45,276,036	$ 15,172.9		45,516,281
Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	218,798,061			205,722,647
Liabilities	200,161,260			189,403,336
Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	36,017,602			34,978,189
Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	62,616,163			58,006,144
Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	55,778,677			50,573,924
Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	472,782			328,798
Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,970,430			6,315,717
Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	18,205,320			17,906,633
Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	19,102,196			18,568,236
Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	2,998,090			2,725,695
Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,650,536			2,343,902
Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	17,790,127			17,662,733
Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,899,039			2,570,486
Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,282,611			2,072,674
Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	99,428,894			93,149,211
Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	50,382,895			46,927,997
Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	16,151,299			14,683,537
Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	409,688			399,431
Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	4,466,134			3,719,672
Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	22,336,838			22,193,004
Non-interest [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	23,533,548			24,586,829
Liabilities	15,893,114			13,463,357
Non-interest [Member] | Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	15,420,332			13,134,559
Non-interest [Member] | Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	472,782			328,798
Non-interest [Member] | Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,575,238			3,279,397
Non-interest [Member] | Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	19,958,310			21,307,432
Less Than One Month [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	39,094,735			29,024,299
Liabilities	97,842,171			93,388,005
Less Than One Month [Member] | Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	20,597,270			21,843,630
Less Than One Month [Member] | Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	12,733,132			9,250,329
Less Than One Month [Member] | Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	55,778,677			50,573,924
Less Than One Month [Member] | Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Less Than One Month [Member] | Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,836,246			6,171,336
Less Than One Month [Member] | Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	3,249,799			2,636,761
Less Than One Month [Member] | Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	123,261			2,463,493
Less Than One Month [Member] | Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	523,786			448,532
Less Than One Month [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	169,328			584,277
Less Than One Month [Member] | Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	495,315			97,048
Less Than One Month [Member] | Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	722,026			51,042
Less Than One Month [Member] | Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Less Than One Month [Member] | Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	21,760,032			19,446,228
Less Than One Month [Member] | Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	10,003,247			4,060,610
Less Than One Month [Member] | Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,539,706			3,896,339
Less Than One Month [Member] | Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	26,553			3,183
Less Than One Month [Member] | Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Less Than One Month [Member] | Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,378,528			885,572
From one to six months [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	60,356,121			66,250,006
Liabilities	38,002,279			35,167,041
From one to six months [Member] | Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From one to six months [Member] | Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	24,212,202			23,292,407
From one to six months [Member] | Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From one to six months [Member] | Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From one to six months [Member] | Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	134,184			144,381
From one to six months [Member] | Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	5,801,906			5,724,376
From one to six months [Member] | Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	6,500,197			4,715,900
From one to six months [Member] | Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	1,353,790			1,289,977
From one to six months [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	497,031			354,424
From one to six months [Member] | Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,537,630			151,277
From one to six months [Member] | Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	832,703			2,488,507
From one to six months [Member] | Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From one to six months [Member] | Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	43,162,885			54,284,920
From one to six months [Member] | Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	8,953,299			8,528,968
From one to six months [Member] | Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	5,354,545			423,374
From one to six months [Member] | Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	18,028			18,536
From one to six months [Member] | Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From one to six months [Member] | Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From six to twelve months [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	12,483,298			12,483,661
Liabilities	16,165,861			13,613,708
From six to twelve months [Member] | Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	13,456,116			10,725,534
From six to twelve months [Member] | Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	2,200,184			1,961,526
From six to twelve months [Member] | Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	416,407			753,451
From six to twelve months [Member] | Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	93,154			173,197
From six to twelve months [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	580,030			249,249
From six to twelve months [Member] | Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,300,390			5,882,444
From six to twelve months [Member] | Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,338,712			25,693
From six to twelve months [Member] | Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From six to twelve months [Member] | Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	7,089,736			4,799,382
From six to twelve months [Member] | Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,731,816			1,387,001
From six to twelve months [Member] | Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	404,417			105,437
From six to twelve months [Member] | Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	38,197			34,455
From six to twelve months [Member] | Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From six to twelve months [Member] | Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
More Than One Year [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	83,330,359			73,377,852
Liabilities	32,257,835			33,771,225
More Than One Year [Member] | Checking accounts [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Time deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	12,214,713			14,737,874
More Than One Year [Member] | Saving deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Other deposits [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Interbank and overnight funds [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Borrowing from banks and other [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	6,953,431			7,583,970
More Than One Year [Member] | Long-term debte [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	12,062,331			10,635,392
More Than One Year [Member] | Borrowing from development entities [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	1,027,360			813,989
More Than One Year [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,404,147			1,155,952
More Than One Year [Member] | Debt securities available-for-sale | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	14,456,792			11,531,964
More Than One Year [Member] | Debt securities held-to-maturity | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	5,598			5,244
More Than One Year [Member] | Service concession arrangementse [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,282,611			2,072,674
More Than One Year [Member] | Commercial loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	27,416,241			14,618,681
More Than One Year [Member] | Consumer loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	29,694,533			32,951,418
More Than One Year [Member] | Mortgages and housing leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	6,852,631			10,258,387
More Than One Year [Member] | Microcredit loans and leases [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	326,910			343,257
More Than One Year [Member] | Other Accounts Receivable [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	890,896			440,275
More Than One Year [Member] | Cash and cash equivalentss [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details 16)

RISK MANAGEMENT (Details 16) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 383,653			$ 630,688
Liabilities	45,276,036	$ 15,172.9		45,516,281
Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	218,798,061			205,722,647
Liabilities	200,161,260			189,403,336
Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	22,336,838			22,193,004
Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	36,017,602			34,978,189
Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	62,616,163			58,006,144
Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	55,778,677			50,573,924
Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	472,782			328,798
Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,970,430			6,315,717
Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	18,205,320			17,906,633
Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	19,102,196			18,568,236
Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	2,998,090			2,725,695
Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,650,536			2,343,902
Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	17,790,127			17,662,733
Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,899,039			2,570,486
Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,282,611			2,072,674
Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	99,428,894			93,149,211
Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	50,382,895			46,927,997
Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	16,151,299			14,683,537
Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	409,688			399,431
Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	4,466,134			3,719,672
Interest Rate Risk [Member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	22,336,838			22,193,004
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	41,072,325			31,411,409
Liabilities	25,284,871			18,895,359
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	10,785,649			13,079,866
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	9,156,432			70,783
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	106,495			712,355
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,327,736			3,187,556
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	534,852			1,314,956
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	373,707			529,843
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	140,796			203,422
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	44,213			76,170
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,841,714			2,486,514
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	37,026,675			28,138,078
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	942,057			413,928
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	74,604			83,339
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,266			9,958
Floating interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	74,072,041			51,229,427
Liabilities	20,887,259			17,449,361
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	7,605,647			6,057,772
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	3,900,072			4,458,094
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	6,772,587			4,737,643
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	2,608,953			2,195,852
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	331,589			256,467
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,128,817			179,413
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			3,928
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,282,611			2,072,674
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	49,061,715			40,904,474
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	9,725,059			2,001,963
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	9,695,527			5,363,330
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	4,550			6,903
Floating interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	842,173			440,275
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	33,079,897			30,387,833
Liabilities	111,751,536			116,881,416
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,378,528			885,572
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	20,597,270			21,843,630
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	33,777,955			29,792,727
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	46,622,245			50,234,077
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,863,935			5,603,362
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	5,026,923			5,173,581
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	851,809			4,234,039
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	11,399			0
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,153,157			799,566
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,289,129			3,323,386
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	51,727			78,860
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	10,240,136			12,039,918
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	15,282,475			12,779,524
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	477,646			324,246
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	207,099			156,761
Fixed interest rate [member] | Less than a year [member] | Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	47,099,086			68,107,149
Liabilities	26,344,480			22,713,843
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	10,446,912			9,075,779
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			269,064
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,950,589			5,087,402
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	10,942,948			8,281,598
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,031			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,024,994			1,084,447
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	12,327,968			14,083,764
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	5,598			1,184
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,100,368			12,066,741
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	24,433,304			31,732,582
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	5,903,522			8,912,622
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	195,773			225,809
Fixed interest rate [member] | Later than one year [member] | Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	107,559			0
Non-interest [Member] | Interest Rate Risk [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	23,533,548			24,586,829
Liabilities	15,893,114			13,463,357
Non-interest [Member] | Interest Rate Risk [Member] | Cash due from banks and central bank [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	19,958,310			21,307,432
Non-interest [Member] | Interest Rate Risk [Member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	15,420,332			13,134,559
Non-interest [Member] | Interest Rate Risk [Member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	472,782			328,798
Non-interest [Member] | Interest Rate Risk [Member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Service concession arrangementse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-interest [Member] | Interest Rate Risk [Member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,575,238			3,279,397
Non-interest [Member] | Interest Rate Risk [Member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 19,958,310			$ 21,307,432
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details 17)

RISK MANAGEMENT (Details 17)	12 Months Ended
	Dec. 31, 2017
Colombia [Member] | Checking account and Savings accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	11.00%
Colombia [Member] | Time deposits lessthan eighteen months [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	4.50%
Guatemala [Member] | Deposits and Capital raising [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	11.60%
Guatemala [Member] | Demand deposits One [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	25.00%	[1]
El Salvador [Member] | Demand deposits Two [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	25.00%	[2]
El Salvador [Member] | Debt Securities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	50.00%
El Salvador [Member] | Demand depositse [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	12.00%
Honduras [Member] | Mandatory investment in local currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	5.00%
Honduras [Member] | Mandatory investment in foreign currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	12.00%
Nicaragua [Member] | Daily, Liabilities in local and foreign currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	12.00%
Nicaragua [Member] | Biweekly, Liabilities in local and foreign currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	14.00%
Costa Rica [Member] | Deposits in local and foreign currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	15.00%
Costa Rica [Member] | Capital raising in local and foreign currency [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Percentage of deposits to be maintained as reserves	15.00%
[1]	This refer to demand deposits in Central Bank or overseas banks.
[2]	This refer to demand deposits in Central Bank, overseas banks or debt securities issue by Central Bank.

RISK MANAGEMENT (Details 18)

RISK MANAGEMENT (Details 18) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2016COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016USD ($)	[1]	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents		$ 22,336,838	$ 22,193,004	$ 7,485.5		$ 7,437.3		$ 22,284,977	$ 17,269,760
Banco de Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents	[2]	9,883,150	10,058,552
Banco Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents	[2]	7,184,470	3,882,343
Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents	[2]	2,905,827	2,628,298
Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents	[2]	1,776,252	1,952,334
Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Cash and cash equivalents	[2]	1,603,609	1,475,836
Later than one day and not later than seven days [Member] | Banco de Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	9,446,780	8,732,532
Later than one day and not later than seven days [Member] | Banco Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	6,876,625	3,453,308
Later than one day and not later than seven days [Member] | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	2,629,285	2,445,146
Later than one day and not later than seven days [Member] | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,701,634	1,723,991
Later than one day and not later than seven days [Member] | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,059,878	871,378
Later than Eight days and not later than Fifteen days [Member] | Banco de Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	8,436,530	5,604,879
Later than Eight days and not later than Fifteen days [Member] | Banco Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	6,657,883	3,158,023
Later than Eight days and not later than Fifteen days [Member] | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	2,332,527	2,212,315
Later than Eight days and not later than Fifteen days [Member] | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,577,328	1,554,462
Later than Eight days and not later than Fifteen days [Member] | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	942,372	795,495
Later than Sixteen days and not later than Thirty days [Member] | Banco de Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	7,161,523	3,786,496
Later than Sixteen days and not later than Thirty days [Member] | Banco Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	5,567,110	2,638,916
Later than Sixteen days and not later than Thirty days [Member] | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,726,392	1,511,457
Later than Sixteen days and not later than Thirty days [Member] | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,506,404	1,206,529
Later than Sixteen days and not later than Thirty days [Member] | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	649,166	490,178
Later than Thirty one days and not later than Ninty days [Member] | Banco de Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	1,082,066	(2,999,598)
Later than Thirty one days and not later than Ninty days [Member] | Banco Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	2,350,522	1,081,962
Later than Thirty one days and not later than Ninty days [Member] | Banco Popular S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	(256,330)	(212,024)
Later than Thirty one days and not later than Ninty days [Member] | Banco AV Villas S.A [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	478,347	56,614
Later than Thirty one days and not later than Ninty days [Member] | Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liquidity Risk Indicator	[3]	$ 361,394	$ (187,120)
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Liquid assets are the sum of the assets that are readily convertible to cash. These assets include cash on hand and bank deposits including Central Bank deposits, securities or coupons that have been transferred to the entity in money market transactions and have not been used in borrowing operations in the money market. It also includes investments in debt securities recorded at fair value, investments in mutual funds with no withdrawal restrictions, and debt securities carried at amortized cost, provided they are legally required or “mandatory” investments, subscribed in the primary market and that can be used for money market operations. The value of the liquid assets mentioned above, is calculated at the fair value market price on the date of the assessment.
[3]	This amount is the remaining value of the liquid assets in the specified time period, or the LRI, that is calculated as the difference among the liquid assets and the liquidity requirement. The liquidity requirement is the difference of contractual cash inflows and contractual and non-contractual cash outflows during the period according to the LRI methodology.

RISK MANAGEMENT (Details 19)

RISK MANAGEMENT (Details 19) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 383,653			$ 630,688
Liabilities	45,276,036	$ 15,172.9		45,516,281
Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	276,041,139			240,298,938
Liabilities	230,362,686			207,690,098
Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	509,351			743,531
Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	40,840,666			35,176,430
Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	67,563,454			61,229,166
Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	58,656,060			51,684,382
Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	505,920			328,816
Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,441,874			6,353,738
Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	21,002,945			23,123,032
Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	25,266,760			19,418,016
Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,935,935			3,629,519
Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	13,464			46,276
Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	6,626,258			5,957,192
Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,159,152			2,772,298
Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	23,219,631			20,961,966
Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,167,181			2,646,977
Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	127,055,148			104,256,128
Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	58,770,228			57,009,314
Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	30,987,645			25,688,513
Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	548,194			548,779
Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	4,758,829			1,766,048
Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	415,738			496,179
Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	56,531			131,819
Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	482,636			589,415
Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	23,420,225			23,431,502
Non-Sensitive [Member] | Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	27,648,122			24,020,917
Liabilities	4,351,782			5,957,192
Non-Sensitive [Member] | Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,351,782			5,957,192
Non-Sensitive [Member] | Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	3,745,261			0
Non-Sensitive [Member] | Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Non-Sensitive [Member] | Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	482,636			589,415
Non-Sensitive [Member] | Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	23,420,225			23,431,502
Less Than One Month [Member] | Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	21,966,095			20,432,762
Liabilities	118,178,961			106,254,453
Less Than One Month [Member] | Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	120,429			406,656
Less Than One Month [Member] | Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	40,840,666			35,176,430
Less Than One Month [Member] | Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	9,583,488			9,280,758
Less Than One Month [Member] | Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	58,656,060			51,684,382
Less Than One Month [Member] | Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	471,645			309,940
Less Than One Month [Member] | Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,274,983			5,877,059
Less Than One Month [Member] | Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	1,963,636			1,279,413
Less Than One Month [Member] | Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	52,468			2,166,658
Less Than One Month [Member] | Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	36,954			28,507
Less Than One Month [Member] | Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	13,345			44,650
Less Than One Month [Member] | Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	2,165,287			0
Less Than One Month [Member] | Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	913,190			820,683
Less Than One Month [Member] | Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	622,057			944,879
Less Than One Month [Member] | Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	649,833			529,014
Less Than One Month [Member] | Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	14,641,827			11,627,160
Less Than One Month [Member] | Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	4,524,515			5,039,323
Less Than One Month [Member] | Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	263,314			146,691
Less Than One Month [Member] | Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	49,932			39,582
Less Than One Month [Member] | Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			783,812
Less Than One Month [Member] | Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	249,305			377,946
Less Than One Month [Member] | Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	52,122			123,672
Less Than One Month [Member] | Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
Less Than One Month [Member] | Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From one to six months [Member] | Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	47,767,497			36,703,200
Liabilities	34,737,201			32,373,070
From one to six months [Member] | Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	377,898			164,753
From one to six months [Member] | Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From one to six months [Member] | Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	21,734,913			24,443,943
From one to six months [Member] | Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From one to six months [Member] | Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			2,292
From one to six months [Member] | Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	166,891			476,679
From one to six months [Member] | Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	6,359,672			5,799,940
From one to six months [Member] | Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	5,780,195			1,233,436
From one to six months [Member] | Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	258,909			251,343
From one to six months [Member] | Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	119			684
From one to six months [Member] | Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	58,605			0
From one to six months [Member] | Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	310,701			541,799
From one to six months [Member] | Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,968,847			1,531,453
From one to six months [Member] | Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	934,821			880,233
From one to six months [Member] | Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	30,985,969			22,248,731
From one to six months [Member] | Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	12,114,983			10,345,530
From one to six months [Member] | Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,228,796			727,017
From one to six months [Member] | Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	117,240			116,175
From one to six months [Member] | Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	238			222,986
From one to six months [Member] | Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	103,245			85,736
From one to six months [Member] | Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	2,657			3,540
From one to six months [Member] | Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From one to six months [Member] | Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From six to twelve months [Member] | Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	28,162,052			25,048,818
Liabilities	20,300,540			18,540,171
From six to twelve months [Member] | Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	3,918			85,827
From six to twelve months [Member] | Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	15,150,201			12,490,712
From six to twelve months [Member] | Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			16,584
From six to twelve months [Member] | Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
From six to twelve months [Member] | Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,262,502			4,459,671
From six to twelve months [Member] | Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	531,963			1,241,972
From six to twelve months [Member] | Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	301,372			244,463
From six to twelve months [Member] | Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			942
From six to twelve months [Member] | Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	50,583			0
From six to twelve months [Member] | Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	619,023			331,319
From six to twelve months [Member] | Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,810,606			1,506,568
From six to twelve months [Member] | Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,576,581			1,219,842
From six to twelve months [Member] | Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	15,378,967			14,210,565
From six to twelve months [Member] | Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	7,186,854			6,034,277
From six to twelve months [Member] | Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,434,850			846,720
From six to twelve months [Member] | Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	119,397			129,340
From six to twelve months [Member] | Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	163			747,269
From six to twelve months [Member] | Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	33,859			18,311
From six to twelve months [Member] | Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,752			4,607
From six to twelve months [Member] | Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
From six to twelve months [Member] | Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
More Than One Year [Member] | Liquidity risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	150,497,373			134,093,241
Liabilities	52,794,200			44,565,212
More Than One Year [Member] | Liquidity risk [member] | Trading derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	7,107			86,295
More Than One Year [Member] | Liquidity risk [member] | Checking accounts [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Liquidity risk [member] | Time deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	21,094,851			15,013,753
More Than One Year [Member] | Liquidity risk [member] | Saving deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Liquidity risk [member] | Other deposits [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	34,275			0
More Than One Year [Member] | Liquidity risk [member] | Interbank and overnight funds [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Liquidity risk [member] | Borrowing from banks and other [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	8,417,134			11,584,008
More Than One Year [Member] | Liquidity risk [member] | Long-term debte [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	18,902,134			14,775,950
More Than One Year [Member] | Liquidity risk [member] | Borrowing from development entities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	4,338,700			3,105,206
More Than One Year [Member] | Liquidity risk [member] | Hedging derivatives Liabilities [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Liquidity risk [member] | Other Liabilitiese [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Liabilities	0			0
More Than One Year [Member] | Liquidity risk [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,316,239			1,078,497
More Than One Year [Member] | Liquidity risk [member] | Financial assets available-for-sale, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	18,818,121			16,979,066
More Than One Year [Member] | Liquidity risk [member] | Held-to-maturity investments, category [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	5,946			17,888
More Than One Year [Member] | Liquidity risk [member] | Commercial loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	66,048,385			56,169,672
More Than One Year [Member] | Liquidity risk [member] | Consumer loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	34,943,876			35,590,184
More Than One Year [Member] | Liquidity risk [member] | Mortgages and housing leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	28,060,685			23,968,085
More Than One Year [Member] | Liquidity risk [member] | Microcredit loans and leases [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	261,625			263,682
More Than One Year [Member] | Liquidity risk [member] | Other Accounts Receivable [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	1,013,167			11,981
More Than One Year [Member] | Liquidity risk [member] | Trading Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	29,329			14,186
More Than One Year [Member] | Liquidity risk [member] | Hedging Derivatives [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
More Than One Year [Member] | Liquidity risk [member] | Other assetss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	0			0
More Than One Year [Member] | Liquidity risk [member] | Cash and cash equivalentss [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Financial assets	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RISK MANAGEMENT (Details 20)

RISK MANAGEMENT (Details 20) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Banco Bogota [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Regulatory Capital	$ 16,749,137	$ 16,236,204
Basic ordinary equity	10,870,598	10,456,131
Basic additional equity	5,878,538	5,780,073
Market Risk	9,220,514	6,438,729
Total assets weighted by risk	$ 123,708,231	$ 116,745,434
Total solvency risk index.	13.54%	13.91%
Basic solvency risk index.	8.79%	8.96%
Banco de Occidente [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Regulatory Capital	$ 4,007,636	$ 3,801,455
Basic ordinary equity	3,123,860	3,029,445
Basic additional equity	883,776	772,010
Market Risk	1,660,535	1,233,358
Total assets weighted by risk	$ 28,165,602	$ 29,588,532
Total solvency risk index.	13.44%	12.85%
Basic solvency risk index.	10.47%	10.24%
Banco Popular [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Regulatory Capital	$ 2,090,131	$ 2,103,019
Basic ordinary equity	1,774,823	1,756,321
Basic additional equity	315,309	346,698
Market Risk	1,391,833	1,339,691
Total assets weighted by risk	$ 18,452,556	$ 18,919,825
Total solvency risk index.	10.53%	11.12%
Basic solvency risk index.	8.94%	9.28%
Banco AV Villas [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Regulatory Capital	$ 1,195,815	$ 1,119,136
Basic ordinary equity	1,060,749	1,002,396
Basic additional equity	135,066	116,740
Market Risk	204,852	993,172
Total assets weighted by risk	$ 9,493,492	$ 9,768,306
Total solvency risk index.	12.33%	11.46%
Basic solvency risk index.	10.94%	10.26%
Corficolombiana [Member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Regulatory Capital	$ 2,666,487	$ 2,611,410
Basic ordinary equity	2,295,929	2,247,231
Basic additional equity	370,558	364,179
Market Risk	1,769,041	1,676,891
Total assets weighted by risk	$ 7,246,604	$ 7,114,069
Total solvency risk index.	36.80%	36.71%
Basic solvency risk index.	31.68%	31.59%

RISK MANAGEMENT (Details Textua

RISK MANAGEMENT (Details Textual) - COP ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Risk Management Explanatory [Line Items]
Maximum amount of unsecured loans as a percentage of regulatory capital	10.00%
Investment in debt instrument as a percentage of total portfolio	61.26%	65.02%
Information on how entity determined that financial assets are credit-impaired financial assets	2,000
Maximum percentage of average difference in foreign currency demoninated rights and foreign currency denominated obligations	20.00%
Maximum negative percentage of average difference in foreign currency demoninated rights and foreign currency denominated obligations	5.00%
Maximum percentage of average spot foreign currency positions	50.00%
Maximum percentage of gross leverage positions	550.00%
Increse in peso value of USD	$ 10
Decrease in equity due to change in value of USD	$ 1,534	$ 13,643
Increase in equity due to change in value of USD		8,186
Decrease in profit before tax due to change in value of USD	921
Increase in interest income, Fifty Basis Point Increase in Interest rate	893,925	849,370
Increase in interest Expense, Fifty Basis Point Increase in Interest rate	973,911	931,643
Increase in interest income, Hundred Basis Point Increase in Interest rate	1,787,849	1,698,740
Increase in interest Expense, Hundred Basis Point Increase in Interest rate	$ 1,947,823	1,863,286
Solvency Risk Ratio	9.00%
Basic Solvency Risk Ratio	4.50%
Investment subject to value at risk	$ 67,538	$ 60,845
Banco de Bogota [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Market risk weighted assets as a percentage of total risk weighted assets	7.50%	5.50%
Banco de Occidente S.A. [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Market risk weighted assets as a percentage of total risk weighted assets	5.90%	4.20%
Banco Popular S.A [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Market risk weighted assets as a percentage of total risk weighted assets	7.50%	9.60%
Banco AV Villas S.A [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Market risk weighted assets as a percentage of total risk weighted assets	2.20%	13.60%
Corficolombiana S.A [Member] | Market risk [member]
Disclosure Of Financial Risk Management Explanatory [Line Items]
Market risk weighted assets as a percentage of total risk weighted assets	32.30%	23.60%

ESTIMATION OF FAIR VALUE (Detai

ESTIMATION OF FAIR VALUE (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	$ 2,650,536	$ 888.2	[1]	$ 2,343,902
Total investments in debt securities available-for sale	17,790,127	5,961.8	[1]	17,662,733
Total investments in debt securities	20,440,663			20,006,635
Trading equity securities	2,149,160	720.2	[1]	1,747,614
Investments in equity securities available-for-sale	824,033	276.2	[1]	729,779
Total equity securities	2,973,193			2,477,393
Total held for trading derivatives Assets	328,392	110.1	[1]	502,209
Total hedging derivatives Assets	55,261	18.5	[1]	128,479
Financial assets in concession contracts	2,282,611	765	[1]	2,072,674
Total financial assets designated at fair value	26,080,120			2,072,674
Biological assets	66,139	22.2		48,002
Investment properties	783,794	262.7	[1]	610,188
Total non- financial assets	849,933			658,190
Total assets at fair value on recurring basis	26,930,053			25,845,580
Total trading derivatives Liabilities	298,665	100.1	[1]	640,695
Total hedging derivatives Liabilities	13,464	$ 4.5	[1]	43,436
Total liabilities at fair value on recurring basis	312,129			684,131
Securities issued by the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,229,606			965,739
Total investments in debt securities available-for sale	7,892,554			9,204,178
Securities issued by the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,613			19,716
Total investments in debt securities available-for sale	1,592,371			1,371,029
Securities issued by other entities of the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	48,355			38,400
Total investments in debt securities available-for sale	92,008			79,435
Securities issued by other entities of the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	21,709			21,077
Total investments in debt securities available-for sale	570,694			489,877
Securities issued by other financial entities [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	833,860			737,884
Total investments in debt securities available-for sale	263,633			120,795
Securities issued by other financial entities [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	303,665			313,129
Total investments in debt securities available-for sale	3,354,444			2,955,925
Securities issued by entities of the Non-financial sector [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	17,869			18,657
Total investments in debt securities available-for sale	2,326			17,923
Securities issued by entities of the Non-financial sector [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total investments in debt securities available-for sale	322,143			580,790
Other investment [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	50,417			66,295
Total investments in debt securities available-for sale	7,190			15,852
Other investment [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	16,416			183
Total investments in debt securities available-for sale	231,493			204,853
Securities issued by foreign Governments [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	92,931			88,095
Total investments in debt securities available-for sale	2,104,397			2,083,345
Securities issued by central banks [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	34,095			74,727
Total investments in debt securities available-for sale	1,356,874			538,731
Currency Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	223,955			391,370
Total hedging derivatives Assets	55,261			128,479
Total trading derivatives Liabilities	144,572			408,903
Total hedging derivatives Liabilities	13,464			43,436
Interest Rate Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	52,970			39,780
Total trading derivatives Liabilities	40,693			25,827
Currency Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	33,104			44,594
Total trading derivatives Liabilities	79,263			164,906
Currency Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	17,632			26,313
Total trading derivatives Liabilities	33,030			39,567
Interest Rate Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets				152
Securities Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total trading derivatives Liabilities				1,492
Bond Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	731
Total trading derivatives Liabilities	1,107
Level 1 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,104,829			887,548
Total investments in debt securities available-for sale	8,154,503			8,760,932
Total investments in debt securities	9,259,332			9,648,480
Trading equity securities	28,659			3,233
Investments in equity securities available-for-sale	768,336			655,096
Total equity securities	796,995			658,329
Total held for trading derivatives Assets	0			0
Total hedging derivatives Assets	0			0
Financial assets in concession contracts	0			0
Total financial assets designated at fair value	10,056,327			0
Biological assets	0			0
Investment properties	0			0
Total non- financial assets	0			0
Total assets at fair value on recurring basis	10,056,327			10,306,809
Total trading derivatives Liabilities				0
Total hedging derivatives Liabilities	0			0
Total liabilities at fair value on recurring basis	0			0
Level 1 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,104,829			887,218
Total investments in debt securities available-for sale	7,668,545			8,281,946
Level 1 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			330
Total investments in debt securities available-for sale	0			22,550
Level 1 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	456,354			375,798
Level 1 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total investments in debt securities available-for sale	0			80,638
Level 1 of fair value hierarchy [member] | Other investment [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Other investment [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Securities issued by foreign Governments [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	29,604			0
Level 1 of fair value hierarchy [member] | Securities issued by central banks [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 1 of fair value hierarchy [member] | Currency Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total hedging derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Total hedging derivatives Liabilities	0			0
Level 1 of fair value hierarchy [member] | Interest Rate Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Level 1 of fair value hierarchy [member] | Currency Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Level 1 of fair value hierarchy [member] | Currency Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets				0
Total trading derivatives Liabilities	0			0
Level 1 of fair value hierarchy [member] | Interest Rate Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets				0
Level 1 of fair value hierarchy [member] | Securities Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total trading derivatives Liabilities				0
Level 1 of fair value hierarchy [member] | Bond Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0
Total trading derivatives Liabilities	0
Level 2 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,532,732			1,444,144
Total investments in debt securities available-for sale	9,628,997			8,886,634
Total investments in debt securities	11,161,729			10,330,778
Trading equity securities	2,095,160			1,744,381
Investments in equity securities available-for-sale	55,697			74,683
Total equity securities	2,150,857			1,819,064
Total held for trading derivatives Assets	326,814			502,209
Total hedging derivatives Assets	55,261			128,479
Financial assets in concession contracts	0			0
Total financial assets designated at fair value	13,694,661			0
Biological assets	0			0
Investment properties	0			0
Total non- financial assets	0			0
Total assets at fair value on recurring basis	13,694,661			12,780,530
Total trading derivatives Liabilities	296,853			640,695
Total hedging derivatives Liabilities	13,464			43,436
Total liabilities at fair value on recurring basis	310,317			684,131
Level 2 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	124,777			78,521
Total investments in debt securities available-for sale	224,009			922,232
Level 2 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	1,613			19,716
Total investments in debt securities available-for sale	1,592,371			1,371,029
Level 2 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	48,355			38,400
Total investments in debt securities available-for sale	92,008			79,435
Level 2 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	21,709			20,747
Total investments in debt securities available-for sale	570,694			467,327
Level 2 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	833,860			737,884
Total investments in debt securities available-for sale	263,633			120,795
Level 2 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	303,665			313,129
Total investments in debt securities available-for sale	2,898,090			2,580,127
Level 2 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	17,869			18,657
Total investments in debt securities available-for sale	2,326			17,923
Level 2 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total investments in debt securities available-for sale	322,143			500,152
Level 2 of fair value hierarchy [member] | Other investment [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	37,442			54,085
Total investments in debt securities available-for sale	563			685
Level 2 of fair value hierarchy [member] | Other investment [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	16,416			183
Total investments in debt securities available-for sale	231,493			204,853
Level 2 of fair value hierarchy [member] | Securities issued by foreign Governments [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	92,931			88,095
Total investments in debt securities available-for sale	2,074,793			2,083,345
Level 2 of fair value hierarchy [member] | Securities issued by central banks [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	34,095			74,727
Total investments in debt securities available-for sale	1,356,874			538,731
Level 2 of fair value hierarchy [member] | Currency Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	222,377			391,370
Total hedging derivatives Assets	55,261			128,479
Total trading derivatives Liabilities	142,760			408,903
Total hedging derivatives Liabilities	13,464			43,436
Level 2 of fair value hierarchy [member] | Interest Rate Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	52,970			39,780
Total trading derivatives Liabilities	40,693			25,827
Level 2 of fair value hierarchy [member] | Currency Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	33,104			44,594
Total trading derivatives Liabilities	79,263			164,906
Level 2 of fair value hierarchy [member] | Currency Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	17,632			26,313
Total trading derivatives Liabilities	33,030			39,567
Level 2 of fair value hierarchy [member] | Interest Rate Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets				152
Level 2 of fair value hierarchy [member] | Securities Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total trading derivatives Liabilities				1,492
Level 2 of fair value hierarchy [member] | Bond Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	731
Total trading derivatives Liabilities	1,107
Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	12,975			12,210
Total investments in debt securities available-for sale	6,627			15,167
Total investments in debt securities	19,602			27,377
Trading equity securities	25,341			0
Investments in equity securities available-for-sale	0			0
Total equity securities	25,341			0
Total held for trading derivatives Assets	1,578			0
Total hedging derivatives Assets	0			0
Financial assets in concession contracts	2,282,611			2,072,674
Total financial assets designated at fair value	2,329,132			2,072,674
Biological assets	66,139			48,002
Investment properties	783,794			610,188
Total non- financial assets	849,933			658,190
Total assets at fair value on recurring basis	3,179,065			2,758,241
Total trading derivatives Liabilities	1,812			0
Total hedging derivatives Liabilities	0			0
Total liabilities at fair value on recurring basis	1,812			0
Level 3 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total investments in debt securities available-for sale				0
Level 3 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0
Level 3 of fair value hierarchy [member] | Securities issued by the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by other entities of the Colombian Government [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by other financial entities [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by entities of the Non-financial sector [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Other investment [Member] | Local currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	12,975			12,210
Total investments in debt securities available-for sale	6,627			15,167
Level 3 of fair value hierarchy [member] | Other investment [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by foreign Governments [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Securities issued by central banks [Member] | Foreign currency [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading debt securities	0			0
Total investments in debt securities available-for sale	0			0
Level 3 of fair value hierarchy [member] | Currency Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	1,578			0
Total hedging derivatives Assets	0			0
Total trading derivatives Liabilities	1,812			0
Total hedging derivatives Liabilities	0			0
Level 3 of fair value hierarchy [member] | Interest Rate Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Level 3 of fair value hierarchy [member] | Currency Swap [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Level 3 of fair value hierarchy [member] | Currency Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0			0
Total trading derivatives Liabilities	0			0
Level 3 of fair value hierarchy [member] | Interest Rate Options [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets				0
Level 3 of fair value hierarchy [member] | Securities Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total trading derivatives Liabilities				$ 0
Level 3 of fair value hierarchy [member] | Bond Forward [member]
Disclosure Of Estimations of Fair Value [Line Items]
Total held for trading derivatives Assets	0
Total trading derivatives Liabilities	$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

ESTIMATION OF FAIR VALUE (De112

ESTIMATION OF FAIR VALUE (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure Of Estimations of Fair Value [Line Items]
Impaired collateralized loans	$ 701,948			$ 657,080
Non-current assets held for sale	101,382	$ 34		259,527	$ 199,475	$ 211,247
Assets held for sale	803,330			916,608
Level 1 of fair value hierarchy [member] | Non-recurring fair value measurement [member]
Disclosure Of Estimations of Fair Value [Line Items]
Impaired collateralized loans	0			0
Non-current assets held for sale	0			0
Assets held for sale	0			0
Level 2 of fair value hierarchy [member] | Non-recurring fair value measurement [member]
Disclosure Of Estimations of Fair Value [Line Items]
Impaired collateralized loans	0			0
Non-current assets held for sale	0			0
Assets held for sale	0			0
Level 3 of fair value hierarchy [member] | Non-recurring fair value measurement [member]
Disclosure Of Estimations of Fair Value [Line Items]
Impaired collateralized loans	701,948			657,080
Non-current assets held for sale	101,382			259,528
Assets held for sale	$ 803,330			$ 916,608
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

ESTIMATION OF FAIR VALUE (De113

ESTIMATION OF FAIR VALUE (Details 2) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Baseline scenario [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Sensitivity of fair value of mortgage-backed securities	[1]	$ 19,602	$ 27,377
Favorable scenario [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Sensitivity of fair value of mortgage-backed securities	[2]	80	302
Unfavorable scenario [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Sensitivity of fair value of mortgage-backed securities	[3]	$ (95)	$ (343)
[1]	Fair value as of December 31, 2017 and 2016 calculated based on valuation scenario, considers 12-month Moving Average Prepayment between 12.4% and 15.8% and 12.3% and 16.0% respectively, and 1 Time Delinquency Curve.
[2]	Pre-payment of 10% and 1 time delinquency curve
[3]	Pre-payment of 20% and 1 time delinquency curve

ESTIMATION OF FAIR VALUE (De114

ESTIMATION OF FAIR VALUE (Details 3) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
WACC [Member]
Disclosure Of Estimations of Fair Value [Line Items]
+100 bps	$ (608,164)	$ (534,128)
-100 bps	949,005	810,001
Growth rate [Member]
Disclosure Of Estimations of Fair Value [Line Items]
+100 bps	520,052	434,225
-100 bps	$ (362,867)	$ (293,491)

ESTIMATION OF FAIR VALUE (De115

ESTIMATION OF FAIR VALUE (Details 4)	Dec. 31, 2017T
Year 7
Disclosure Of Estimations of Fair Value [Line Items]
Tons of rubber per hectare per year	0.60
Year 8
Disclosure Of Estimations of Fair Value [Line Items]
Tons of rubber per hectare per year	0.90
Year 9
Disclosure Of Estimations of Fair Value [Line Items]
Tons of rubber per hectare per year	1.40
Year 10 and other
Disclosure Of Estimations of Fair Value [Line Items]
Tons of rubber per hectare per year	1.80

ESTIMATION OF FAIR VALUE (De116

ESTIMATION OF FAIR VALUE (Details 5)	Dec. 31, 2017T
0 to 3
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	0
4
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	4.25
5
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	9.91
6
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	11.73
7
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	21.58
8 to 25
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	21.80
More than 25
Disclosure Of Estimations of Fair Value [Line Items]
Tons of fresh fruit per hectare	36.10

ESTIMATION OF FAIR VALUE (De117

ESTIMATION OF FAIR VALUE (Details 6)	12 Months Ended
	Dec. 31, 2017
Weighted Average [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	22.14%
0 to 3
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	19.00%
4
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	23.00%
5
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	23.00%
6
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	23.00%
7
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	23.00%
8 to 25
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	23.00%
More than 25
Disclosure Of Estimations of Fair Value [Line Items]
Extraction rate	21.00%

ESTIMATION OF FAIR VALUE (De118

ESTIMATION OF FAIR VALUE (Details 7) $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)$ / ton	Dec. 31, 2016COP ($)$ / ton
Top of range [member] | Rubber Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	1,620	1,907
Change in fiscal year-end price	5.00%	5.00%
Value of the biological asset	$ 25,366	$ 15,628
Effect on profits before taxes	$ 10,762	$ 9,888
Top of range [member] | African Palm Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	683	637
Change in fiscal year-end price	5.00%	5.00%
Value of the biological asset	$ 27,883	$ 23,109
Effect on profits before taxes	$ 5,068	$ 5,495
Weighted Average [Member] | Rubber Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	1,543	1,817
Change in fiscal year-end price	0.00%	0.00%
Value of the biological asset	$ 24,158	$ 14,606
Effect on profits before taxes	$ 9,554	$ 8,899
Weighted Average [Member] | African Palm Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	651	606
Change in fiscal year-end price	0.00%	0.00%
Value of the biological asset	$ 26,555	$ 21,597
Effect on profits before taxes	$ 3,740	$ 5,354
Bottom of range [member] | Rubber Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	1,466	1,726
Change in fiscal year-end price	(5.00%)	(5.00%)
Value of the biological asset	$ 22,950	$ 13,584
Effect on profits before taxes	$ 8,346	$ 7,910
Bottom of range [member] | African Palm Plantations [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Reference price USD/ton | $ / ton	618	576
Change in fiscal year-end price	(5.00%)	(5.00%)
Value of the biological asset	$ 25,228	$ 20,085
Effect on profits before taxes	$ 2,412	$ 3,213

ESTIMATION OF FAIR VALUE (De119

ESTIMATION OF FAIR VALUE (Details 8) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	$ 0	$ 963,794
Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	189,135	210,073
Local currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	963,794
Local currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	28,153	208,526
Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	160,982	1,547
Securities issued by the Colombian Government [Member] | Trading debt securities [Member] | Local currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	963,794
Securities issued by the Colombian Government [Member] | Trading debt securities [Member] | Local currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	28,153	208,526
Securities issued by other financial institutions [Member] | Trading debt securities [Member] | Local currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by other financial institutions [Member] | Trading debt securities [Member] | Local currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by other financial institutions [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by other financial institutions [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	65,209	1,547
Securities issued by other entities of the Colombian Government [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by other entities of the Colombian Government [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	10,221	0
Securities issued by entities of the Non-financial sector [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by entities of the Non-financial sector [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	85,552	0
Securities issued by central banks [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by central banks [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by foreign Governments [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Securities issued by foreign Governments [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Other investment [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level two to one [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	0	0
Other investment [Member] | Trading debt securities [Member] | Foreign currency [Member] | Level one to two [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Debt instruments held	$ 0	$ 0

ESTIMATION OF FAIR VALUE (De120

ESTIMATION OF FAIR VALUE (Details 9) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure Of Estimations of Fair Value [Line Items]
Assets	$ 224,073,721
Assets	236,538,540	$ 79,268.9		$ 224,073,721
Financial assets in concession [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Assets	2,072,674			1,891,692	$ 1,738,598
Valuation adjustment with an effect on income	209,937			180,982	153,094
Valuation adjustments with an effect on OCI	0			0	0
Additions	0			0	0
Sales/disposals	0			0	0
Reclassification of bearer plants balance				0
Effects of amendments in accounting policies of bearer plants.				0
Transfers to non-current assets held for sale	0			0
Reclassification	0			0
Assets	2,282,611			2,072,674	1,891,692
Debt Securities [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Assets	27,377			36,077	36,821
Valuation adjustment with an effect on income	765			750	2,892
Valuation adjustments with an effect on OCI	(8,540)			(9,450)	(3,636)
Additions	0			0	0
Sales/disposals	0			0	0
Reclassification of bearer plants balance				0
Effects of amendments in accounting policies of bearer plants.				0
Transfers to non-current assets held for sale	0			0
Reclassification	0			0
Assets	19,602			27,377	36,077
Trading equity securities [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Assets	0			0	0
Valuation adjustment with an effect on income	0			0	0
Valuation adjustments with an effect on OCI	0			0	0
Additions	0			0	0
Sales/disposals	0			0	0
Reclassification of bearer plants balance				0
Effects of amendments in accounting policies of bearer plants.				0
Transfers to non-current assets held for sale	0			0
Reclassification	25,341			0
Assets	25,341			0	0
Biological assets [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Assets	48,002			240,212	202,399
Valuation adjustment with an effect on income	13,503			14,644	22,922
Valuation adjustments with an effect on OCI	0			0	0
Additions	24,409			21,432	35,265
Sales/disposals	(19,775)			(20,670)	(20,374)
Reclassification of bearer plants balance				(188,177)
Effects of amendments in accounting policies of bearer plants.				(18,108)
Transfers to non-current assets held for sale	0			0
Reclassification	0			(1,331)
Assets	66,139			48,002	240,212
Investment property [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]
Disclosure Of Estimations of Fair Value [Line Items]
Assets	610,188			538,246	366,742
Valuation adjustment with an effect on income	46,675			53,680	104,769
Valuation adjustments with an effect on OCI	0			0	0
Additions	84,036			71,268	89,679
Sales/disposals	(28,431)			(61,786)	(22,944)
Reclassification of bearer plants balance				0
Effects of amendments in accounting policies of bearer plants.				0
Transfers to non-current assets held for sale	101,469			11,319
Reclassification	(30,143)			(2,539)
Assets	$ 783,794			$ 610,188	$ 538,246
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

ESTIMATION OF FAIR VALUE (De121

ESTIMATION OF FAIR VALUE (Details 10) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Estimations of Fair Value [Line Items]
Investments in fixed income held to maturity		$ 2,899,039	$ 971.5		$ 2,570,486
Credit portfolio at amortized cost		160,754,295	53,872		150,898,732
Total financial assets		383,653			630,688
Customer deposits		154,885,224	51,905.2		143,887,055
Liabilities		45,276,036	15,172.9		45,516,281
Total financial Liabilities		200,161,260	$ 67,078.1		189,403,336
At fair value [member]
Disclosure Of Estimations of Fair Value [Line Items]
Investments in fixed income held to maturity	[2],[3],[4]	2,928,929			2,558,333
Credit portfolio at amortized cost		166,303,676			159,917,633
Total financial assets		169,232,605			162,475,966
Customer deposits	[5]	154,805,726			146,778,588
Liabilities	[4]	45,413,210			46,545,065
Total financial Liabilities		200,218,936			193,323,653
Carrying Value [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Investments in fixed income held to maturity	[3],[4]	2,899,039			2,570,486
Credit portfolio at amortized cost		160,754,295			150,898,732
Total financial assets		163,653,334			153,469,218
Customer deposits	[5]	154,885,224			143,887,055
Liabilities	[4]	45,276,036			45,516,281
Total financial Liabilities		$ 200,161,260			$ 189,403,336
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Financial assets held-to-maturity Fair value of fixed income investments at amortized cost was determined using the dirty price given by the price supplier, securities in an active market and with a market price for the day of the valuation are classified as level 1, securities with no active market and/or with an estimated price (present value of the flows of a security, discounted with the reference rate and the corresponding margin) given by the supplier are classified as level 2.
[3]	Financial assets held-to-maturity Fair value of fixed income investments at amortized cost was determined using the dirty price given by the price supplier, securities in an active market and with a market price for the day of the valuation are classified as level 1, securities with no active market and/or with an estimated price (present value of the flows of a security, discounted with the reference rate and the corresponding margin) given by the supplier are classified as level 2.Financial assets held-to-maturity Fair value of fixed income investments at amortized cost was determined using the dirty price given by the price supplier, securities in an active market and with a market price for the day of the valuation are classified as level 1, securities with no active market and/or with an estimated price (present value of the flows of a security, discounted with the reference rate and the corresponding margin) given by the supplier are classified as level 2.
[4]	Financial liabilities For financial liabilities and other short-term liabilities, the carrying value was considered similar to its fair value. The fair value of long-term financial liabilities was determined using the discounted cash flow model at interest rates free of risk adjusted by risk premiums of each entity. The fair value of outstanding bonds is determined according to quoted prices or estimated prices supplied by the price vendor. It is considered that this is a level 2 valuation.
[5]	Customer deposits The fair value of demand deposits is equal to their carrying value. For fixed-term deposits with maturities of less than 180 days, its fair value is deemed equal to its carrying value. For fixed-term deposits with maturities of more than 180 days, its fair value was estimated using the carrying discounted cash flow models to the interest rates offered by banks in accordance with their maturity. This is considered this as a level 2 valuation.

ESTIMATION OF FAIR VALUE (De122

ESTIMATION OF FAIR VALUE (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015COP ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017$ / ton	Dec. 31, 2017$ / ton	Dec. 31, 2016$ / ton	Dec. 31, 2016$ / ton
Disclosure Of Estimations of Fair Value [Line Items]
Range of growth rate	3.00%	3.00%	1.00%	1.00%
Weighted average cost of capital, significant unobservable inputs, assets	9.20%	9.20%	8.42%	8.42%
Price of natural rubber	$ 4.6	$ 1,542	$ 5.5	$ 1,816	$ 6.7	$ 2,136
Price of african palm per ton								650.58	1.9	606.20	1.8
Financial assets at fair value through profit or loss	$ 4,799,696		$ 4,091,516				$ 1,608,400,000
Global Markets database [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Cost of equity	15.23%	15.23%
Cost of Debt	5.84%	5.84%
Weighted average cost of capital	11.71%	11.71%
Agriculture [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Cost of equity	15.23%	15.23%
Cost of Debt	5.84%	5.84%
Weighted average cost of capital	11.71%	11.71%
Baseline scenario [Member] | Bottom of range [member]
Disclosure Of Estimations of Fair Value [Line Items]
Constant prepayment rate, significant unobservable inputs, assets	12.40%	12.40%	12.30%	12.30%
Baseline scenario [Member] | Top of range [member]
Disclosure Of Estimations of Fair Value [Line Items]
Constant prepayment rate, significant unobservable inputs, assets	15.80%	15.80%	16.00%	16.00%
Favorable scenario [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Constant prepayment rate, significant unobservable inputs, assets	10.00%	10.00%
Unfavorable scenario [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Constant prepayment rate, significant unobservable inputs, assets	20.00%	20.00%
Service concession arrangementse [Member]
Disclosure Of Estimations of Fair Value [Line Items]
Financial assets at fair value through profit or loss	$ 2,282,611		$ 2,072,674

CASH AND CASH EQUIVALENTS (Deta

CASH AND CASH EQUIVALENTS (Details) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)	[1]	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of cash and cash equivalents [Line Items]
Total cash and cash equivalents		$ 22,336,838	$ 7,485.5		$ 22,193,004	$ 7,437.3		$ 22,284,977	$ 17,269,760
Domestic currency investments [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash		4,100,166			3,476,270
In the Colombian Central Bank		3,820,539			3,598,125
Demand deposits in banks and other financial entities		312,661			380,610
Clearing		1,733			2,435
Investments in debt securities maturing in under three months		28,603			41,064
Restricted cash	[2]	366,584			41
Total cash and cash equivalents		8,630,286			7,498,545
Foreign currency investments [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash		1,704,861			1,422,278
Demand deposits in banks and other financial entities		11,999,859			13,268,996
Restricted cash	[3]	1,832			3,185
Total cash and cash equivalents		$ 13,706,552			$ 14,694,459
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Grupo Aval has restricted cash related to the collection of tolls on concessions and banking reserve. The increase presented is mainly attributable to the business combination of Concesionaria Vial del Pacífico S.A.S. Ps. 89,491 and Concesionaria Nueva Vía al Mar S.A.S. Ps. 119,524 (Grupo Aval considers this acquisition non-significant ) and restricted cash related to unpaid pension balances at Industrial Lehner Ps. 67,777.
[3]	Grupo Aval has restricted cash related to deposits in guarantee for Banco Corficolombiana Panama S.A and Gas Comprimido del Peru S.A.

CASH AND CASH EQUIVALENTS (D124

CASH AND CASH EQUIVALENTS (Details Textual) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of cash and cash equivalents [Line Items]
Cash reserves	$ 7,679,587	$ 7,151,365
Unpaid Pension for Industrial Lehner [Member]
Disclosure of cash and cash equivalents [Line Items]
Current restricted cash and cash equivalents	67,777
Concesionaria Vial Del Pacifico S.A.S. [Member]
Disclosure of cash and cash equivalents [Line Items]
Current restricted cash and cash equivalents	89,491
Concesionaria Nueva Via Al Mar S.A.S. [Member]
Disclosure of cash and cash equivalents [Line Items]
Current restricted cash and cash equivalents	$ 119,524

DEBT AND EQUITY SECURITIES H125

DEBT AND EQUITY SECURITIES HELD-FOR-TRADING (Details) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		$ 4,799,696	$ 4,091,516
Debt Securities [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		2,650,536	2,343,902
Debt Securities [Member] | Domestic currency investments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		2,180,107	1,826,976
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		1,229,606	965,739
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by other entities of the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		48,355	38,400
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by other financial entities [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		833,860	737,884
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by Non-financial sector entities [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		17,869	18,657
Debt Securities [Member] | Domestic currency investments [Member] | Others [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		50,417	66,296
Debt Securities [Member] | Foreign currency investments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		470,429	516,926
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		1,613	19,716
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by other entities of the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		21,709	21,076
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by other financial entities [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		303,665	313,129
Debt Securities [Member] | Foreign currency investments [Member] | Others [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		16,416	183
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued or secured by Foreign Governments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		92,931	88,095
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued or secured by Central Banks [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		34,095	74,727
Trading equity securities [member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		2,149,160	1,747,614
Trading equity securities [member] | Domestic currency investments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		2,086,138	1,747,614
Trading equity securities [member] | Domestic currency investments [Member] | Corporate Stock [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		4,188	3,233
Trading equity securities [member] | Domestic currency investments [Member] | Investment funds [member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		802,941	644,063
Trading equity securities [member] | Domestic currency investments [Member] | Pension and severance funds 1 [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading	[1]	1,279,009	1,100,318
Trading equity securities [member] | Foreign currency investments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		63,022	0
Trading equity securities [member] | Foreign currency investments [Member] | Corporate Stock [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		49,812	0
Trading equity securities [member] | Foreign currency investments [Member] | Investment funds [member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		$ 13,210	$ 0
[1]	Pursuant to Colombian rules the subsidiary Porvenir S. A. is required to directly invest in mandatory severance and pension funds managed by Porvenir, 1% of the total assets of these funds.

DEBT AND EQUITY SECURITIES H126

DEBT AND EQUITY SECURITIES HELD-FOR-TRADING (Details 1) - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		$ 843,075	$ 629,121
Pledged in money market operations [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		813,783	629,121
Pledged in money market operations [Member] | Securities issued by central banks [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		5,217	5,611
Pledged in money market operations [Member] | Securities issued by foreign Governments [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		54,644	50,831
Pledged in money market operations [Member] | Securities issued by the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		744,332	562,986
Pledged in money market operations [Member] | Securities issued by other financial entities [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading		9,590	9,693
Pledged as collateral to special entities such as CRCC, BR, and BVC [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading	[1]	29,292	0
Pledged as collateral to special entities such as CRCC, BR, and BVC [Member] | Securities issued by the Colombian Government [Member]
Disclosure of financial assets held for trading through profit or losses [Line Items]
Held-for-trading	[1]	$ 29,292	$ 0
[1]	Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valores de Colombia - BVC

DEBT AND EQUITY SECURITIES H127

DEBT AND EQUITY SECURITIES HELD-FOR-TRADING (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial assets held for trading through profit or losses [Line Items]
Dividend income	$ 50,439	$ 28,027	$ 33,611

AVAILABLE FOR SALE FINANCIAL AS

AVAILABLE FOR SALE FINANCIAL ASSETS (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)		Dec. 31, 2016COP ($)		Dec. 31, 2017USD ($)	[3]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	$ 18,054,767		$ 18,174,844
Unrealised gain, financial assets available for sale	683,824		552,491
Unrealised losses, financial assets available for sale	(124,431)	[1]	(334,823)	[2]
Financial assets available-for-sale, at fair value	18,614,160		18,392,512		$ 6,238
Debt Securities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	17,777,863		17,934,949
Unrealised gain, financial assets available for sale	136,620		62,525
Unrealised losses, financial assets available for sale	(124,356)	[1]	(334,741)	[2]
Financial assets available-for-sale, at fair value	17,790,127		17,662,733
Debt Securities [Member] | Domestic currency investments [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	8,210,178		9,605,553
Unrealised gain, financial assets available for sale	78,780		21,358
Unrealised losses, financial assets available for sale	(31,247)	[1]	(188,727)	[2]
Financial assets available-for-sale, at fair value	8,257,711		9,438,184
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by the Colombian Government [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	7,855,098		9,371,078
Unrealised gain, financial assets available for sale	68,411		16,622
Unrealised losses, financial assets available for sale	(30,955)	[1]	(183,521)	[2]
Financial assets available-for-sale, at fair value	7,892,554		9,204,179
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by other colombian government entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	90,532		83,582
Unrealised gain, financial assets available for sale	1,566		386
Unrealised losses, financial assets available for sale	(90)	[1]	(4,533)	[2]
Financial assets available-for-sale, at fair value	92,008		79,435
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by other financial entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	255,192		116,683
Unrealised gain, financial assets available for sale	8,643		4,317
Unrealised losses, financial assets available for sale	(202)	[1]	(205)	[2]
Financial assets available-for-sale, at fair value	263,633		120,795
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by Non-financial sector entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	2,282		18,390
Unrealised gain, financial assets available for sale	44		0
Unrealised losses, financial assets available for sale	0	[1]	(467)	[2]
Financial assets available-for-sale, at fair value	2,326		17,923
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued by others [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	7,074		15,820
Unrealised gain, financial assets available for sale	116		33
Unrealised losses, financial assets available for sale	0	[1]	(1)	[2]
Financial assets available-for-sale, at fair value	7,190		15,852
Debt Securities [Member] | Foreign currency investments [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	9,567,685		8,329,396
Unrealised gain, financial assets available for sale	57,840		41,167
Unrealised losses, financial assets available for sale	(93,109)	[1]	(146,014)	[2]
Financial assets available-for-sale, at fair value	9,532,416		8,224,549
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by the Colombian Government [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	1,587,359		1,368,836
Unrealised gain, financial assets available for sale	9,160		7,018
Unrealised losses, financial assets available for sale	(4,148)	[1]	(4,825)	[2]
Financial assets available-for-sale, at fair value	1,592,371		1,371,029
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by other colombian government entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	565,762		496,223
Unrealised gain, financial assets available for sale	11,685		1,843
Unrealised losses, financial assets available for sale	(6,753)	[1]	(8,189)	[2]
Financial assets available-for-sale, at fair value	570,694		489,877
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by other financial entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	3,366,119		2,978,145
Unrealised gain, financial assets available for sale	3,210		6,045
Unrealised losses, financial assets available for sale	(14,885)	[1]	(28,266)	[2]
Financial assets available-for-sale, at fair value	3,354,444		2,955,924
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by Non-financial sector entities [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	345,003	[4]	658,703	[5]
Unrealised gain, financial assets available for sale	21,681	[4]	10,779	[5]
Unrealised losses, financial assets available for sale	(44,541)	[1],[4]	(88,692)	[2],[5]
Financial assets available-for-sale, at fair value	322,143	[4]	580,790	[5]
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by others [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	230,412		205,143
Unrealised gain, financial assets available for sale	2,710		1,486
Unrealised losses, financial assets available for sale	(1,629)	[1]	(1,776)	[2]
Financial assets available-for-sale, at fair value	231,493		204,853
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by foreign Governments [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	2,113,106		2,082,953
Unrealised gain, financial assets available for sale	8,655		13,400
Unrealised losses, financial assets available for sale	(17,364)	[1]	(13,008)	[2]
Financial assets available-for-sale, at fair value	2,104,397		2,083,345
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued by central banks [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	1,359,924		539,393
Unrealised gain, financial assets available for sale	739		596
Unrealised losses, financial assets available for sale	(3,789)	[1]	(1,258)	[2]
Financial assets available-for-sale, at fair value	1,356,874		538,731
Equity securities available for sale [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	276,904		239,895
Unrealised gain, financial assets available for sale	547,204		489,966
Unrealised losses, financial assets available for sale	(75)	[1]	(82)	[2]
Financial assets available-for-sale, at fair value	824,033		729,779
Equity securities available for sale [Member] | Domestic currency investments [Member] | Corporate Stock [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	276,452		239,502
Unrealised gain, financial assets available for sale	541,520		485,935
Unrealised losses, financial assets available for sale	(75)	[1]	(82)	[2]
Financial assets available-for-sale, at fair value	817,897		725,355
Equity securities available for sale [Member] | Foreign currency investments [Member] | Corporate Stock [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available for sale, at cost	452		393
Unrealised gain, financial assets available for sale	5,684		4,031
Unrealised losses, financial assets available for sale	0	[1]	0	[2]
Financial assets available-for-sale, at fair value	$ 6,136		$ 4,424
[1]	Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from two issuers were classified as impaired and realized the impairment in statement of profit or loss as explained in below (**).
[2]	Unrealized losses correspond to changes in fair value that reflect market conditions such as variations in interest rates and other economic conditions from the country where the investment is issued. After Grupo Aval objectively evaluated each securities’ issuer, it was concluded that only the securities from one issuer were classified as impaired.
[3]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[4]	Cost is net of Ps. 71,708 for impairment recognized in statement of income as operating expense for the securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries filed for bankruptcy protection on June, 2016.
[5]	Cost is net of Ps. 72,110 for impairment recognized in statement of income in impairment loss on financial asset line from the debt investment securities issued by OI S.A. and Telemar Norte Leste S.A., after OI S.A. and subsidiaries which filed for bankruptcy protection on June, 2016.

AVAILABLE FOR SALE FINANCIAL129

AVAILABLE FOR SALE FINANCIAL ASSETS (Details 1) - Equity securities available for sale [Member] - COP ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	$ 824,033	$ 729,779
Empresa de Energia de Bogota S.A. E.S.P. [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	659,208	592,142
Gas Natural S.A. ESP [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	49,998	74,624
Mineros S.A. [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	56,546	42,913
Bolsa de Valores de Colombia S.A. [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	52,064	15,603
Master Card [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	5,634	3,874
Others [Member]
Disclosure of available for sale financial assets [Line Items]
Available For Sale Equity Instruments	[1]	$ 583	$ 623
[1]	These investments in equity securities have been designated as available-for-sale sale taking into account that they represent strategic investments for Grupo Aval and therefore, they are not expected to be sold in a foreseeable future.

AVAILABLE FOR SALE FINANCIAL130

AVAILABLE FOR SALE FINANCIAL ASSETS (Details 2) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		$ 18,614,160	$ 6,238		$ 18,392,512
Debt securities available for sale [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		3,115,459			4,786,327
Debt securities available for sale [Member] | Other collaterals [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		158,951			0
Debt securities available for sale [Member] | Securities issued or secured by Central Banks [Member] | Other collaterals [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		158,951			0
Debt securities available for sale [Member] | Pledged in money market operations [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		2,586,894			4,634,984
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by foreign Governments [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		148,816			299,560
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by Colombian governments [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		2,215,568			4,174,184
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by Non-financial sector entities [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		0			3,020
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by other colombian government entities [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		133,701			83,076
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by other financial entities [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		38,536			35,809
Debt securities available for sale [Member] | Pledged in money market operations [Member] | Securities issued by others [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		50,273			39,335
Debt securities available for sale [Member] | Pledged as derivative collateral instruments [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		77,736			151,343
Debt securities available for sale [Member] | Pledged as derivative collateral instruments [Member] | Securities issued by Colombian governments [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets		77,736			151,343
Debt securities available for sale [Member] | Pledged as collateral to special entities such as CRCC, BR and BVC [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets	[2]	291,878			0
Debt securities available for sale [Member] | Pledged as collateral to special entities such as CRCC, BR and BVC [Member] | Securities issued by Colombian governments [Member]
Disclosure of available for sale financial assets [Line Items]
Available-for-sale financial assets	[2]	$ 291,878			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Cámara de Riesgo Central de Contraparte – CRCC, Banco de la República – BR and Bolsa de Valor es de Colombia – BVC

AVAILABLE FOR SALE FINANCIAL131

AVAILABLE FOR SALE FINANCIAL ASSETS (Details 3) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	$ 18,614,160	$ 6,238		$ 18,392,512
Financial assets available for sale, at cost	18,054,767			18,174,844
Debt securities available for sale [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	17,790,127			17,662,733
Financial assets available for sale, at cost	17,777,853			17,934,949
Debt securities available for sale [Member] | Up to 1 month [Member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	495,315			881,951
Financial assets available for sale, at cost	495,284			880,907
Debt securities available for sale [Member] | More than 1 month and no more than 3 months [member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	601,654			313,386
Financial assets available for sale, at cost	601,156			313,048
Debt securities available for sale [Member] | More than 3 months and no more than 1 years [member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	2,236,367			2,204,219
Financial assets available for sale, at cost	2,235,214			2,199,014
Debt securities available for sale [Member] | More than 1 year and no more than 5 years [member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	11,436,614			9,544,836
Financial assets available for sale, at cost	11,437,189			9,669,504
Debt securities available for sale [Member] | More than 5 years and no more than 10 years [member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	2,792,063			4,345,791
Financial assets available for sale, at cost	2,768,870			4,483,043
Debt securities available for sale [Member] | Later than ten years [member]
Disclosure of available for sale financial assets [Line Items]
Financial assets available-for-sale, at fair value	228,114			372,550
Financial assets available for sale, at cost	$ 240,140			$ 389,433
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

AVAILABLE FOR SALE FINANCIAL132

AVAILABLE FOR SALE FINANCIAL ASSETS (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Securities issued by Telemar Norte Leste S.A. [Member] | Debt securities available for sale [Member]
Disclosure of available for sale financial assets [Line Items]
Impairment loss on available for sale financial assets	$ 71,708	$ 72,110

HELD-TO-MATURITY INVESTMENTS (D

HELD-TO-MATURITY INVESTMENTS (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	$ 2,899,039	$ 971.5		$ 2,570,486
Debt Securities [Member] | Domestic currency investments [Member]
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	2,848,345			2,544,794
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued or secured by Colombian Government
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	424			1,829
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued or secured by other Colombian Government entities
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	2,839,286			2,484,078
Debt Securities [Member] | Domestic currency investments [Member] | Securities issued or secured by other financial entities
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	8,635			58,887
Debt Securities [Member] | Foreign currency investments [Member]
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	50,694			25,692
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued or secured by other financial entities
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	23,830			0
Debt Securities [Member] | Foreign currency investments [Member] | Others
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	0			1,540
Debt Securities [Member] | Foreign currency investments [Member] | Securities issued or secured by Foreign Governments
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	$ 26,864			$ 24,152
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

HELD-TO-MATURITY INVESTMENTS134

HELD-TO-MATURITY INVESTMENTS (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	$ 2,899,039	$ 971.5		$ 2,570,486
Up to 1 month
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	722,026			695,201
More than 1 month and no more than 3 months
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	38,071			27,608
More than 3 months and no more than 1 year
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	2,133,344			1,842,566
More than 1 year and no more than 5 years
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	5,598			4,938
More than 5 years and no more than 10 years
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	0			0
More than 10 years
Disclosure of Held-To-Maturity Investments [Line Items]
Held-to-maturity investments	$ 0			$ 173
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

DERIVATIVE INSTRUMENTS AND H135

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Assets
Notional Amount	$ 31,835,928			$ 26,373,860
Fair Value	328,392	$ 110.1		502,209
Liabilities
Fair Value	298,665	$ 100.1		640,695
Notional Amount	29,015,306			26,315,007
Fair Value	298,665			640,695
Forward contract [member]
Assets
Notional Amount	17,517,635			15,461,960
Fair Value	224,686			391,371
Liabilities
Notional Amount	15,197,221			16,923,438
Fair Value	145,679			410,395
Swap contract [member]
Assets
Notional Amount	8,389,879			7,309,529
Fair Value	86,074			84,373
Liabilities
Notional Amount	7,458,672			5,982,090
Fair Value	119,956			190,733
Futures contract [member]
Assets
Notional Amount	4,558,472			2,267,787
Fair Value	0			0
Liabilities
Notional Amount	5,324,037			2,405,351
Fair Value	0			0
Option contract [member]
Assets
Notional Amount	1,369,942			1,334,584
Fair Value	17,632			26,465
Liabilities
Notional Amount	1,035,376			1,004,128
Fair Value	33,030			39,567
Foreign currency to buy [Member] | Forward contract [member]
Assets
Notional Amount	6,126,920			5,255,735
Fair Value	60,799			118,568
Liabilities
Notional Amount	9,027,166			9,286,812
Fair Value	120,083			247,967
Foreign currency to buy [Member] | Futures contract [member]
Assets
Notional Amount	1,192,880			1,069,003
Fair Value	0			0
Liabilities
Notional Amount	4,508,630			1,995,604
Fair Value	0			0
Foreign currency to buy [Member] | Option contract [member]
Assets
Notional Amount	0			563,522
Fair Value	0			10,769
Liabilities
Notional Amount	0			0
Fair Value	0			0
Foreign currency to sell [Member] | Forward contract [member]
Assets
Notional Amount	10,769,180			10,206,225
Fair Value	163,156			272,803
Liabilities
Notional Amount	5,547,955			7,039,126
Fair Value	24,489			160,936
Foreign currency to sell [Member] | Futures contract [member]
Assets
Notional Amount	2,873,592			1,198,784
Fair Value	0			0
Liabilities
Notional Amount	815,407			409,747
Fair Value	0			0
Foreign currency to sell [Member] | Option contract [member]
Liabilities
Notional Amount	1,035,376			447,818
Fair Value	33,030			19,960
Debt securities to buy [Member] | Forward contract [member]
Assets
Notional Amount	191,500			0
Fair Value	357			0
Liabilities
Notional Amount	185,000
Fair Value	171
Debt securities to buy [Member] | Futures contract [member]
Assets
Notional Amount	408,000
Fair Value	0
Debt securities to buy [Member] | Option contract [member]
Assets
Notional Amount	1,369,942			739,512
Fair Value	17,632			15,544
Debt securities to sell [Member] | Forward contract [member]
Assets
Notional Amount	430,035			0
Fair Value	374			0
Liabilities
Notional Amount	437,100			597,500
Fair Value	936			1,492
Debt securities to sell [Member] | Futures contract [member]
Assets
Notional Amount	84,000			0
Fair Value	0			0
Debt securities to sell [Member] | Option contract [member]
Assets
Notional Amount	0
Fair Value	0
Liabilities
Notional Amount	0			556,310
Fair Value	0			19,607
Cross currency swap [Member] | Swap contract [member]
Assets
Notional Amount	1,534,252			1,288,048
Fair Value	33,104			44,593
Liabilities
Notional Amount	1,574,121			1,771,324
Fair Value	79,263			164,906
Interest rates swap [Member] | Swap contract [member]
Assets
Notional Amount	6,855,627			6,021,481
Fair Value	52,970			39,780
Liabilities
Notional Amount	5,884,551			4,210,766
Fair Value	40,693			25,827
Interest rate to buy [Member] | Option contract [member]
Assets
Notional Amount	0			31,550
Fair Value	$ 0			$ 152
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

DERIVATIVE INSTRUMENTS AND H136

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Assets
Notional Amount	$ 4,233,151			$ 5,333,541
Fair Value	55,261	$ 18.5		128,479
Liabilities
Notional Amount	3,377,903			3,058,182
Fair Value	13,464	$ 4.5		43,436
Forward contract [member]
Assets
Notional Amount	2,600,903			4,209,775
Fair Value	55,261			128,479
Liabilities
Notional Amount	1,836,667			2,504,551
Fair Value	13,464			43,436
Futures contract [member]
Assets
Notional Amount	1,632,248			1,123,766
Fair Value	0			0
Liabilities
Notional Amount	1,541,236			553,631
Fair Value	0			0
Foreign currency to buy [Member] | Forward contract [member]
Assets
Notional Amount	11,164			474,412
Fair Value	1			3,914
Liabilities
Notional Amount	729,692			967,702
Fair Value	5,455			28,297
Foreign currency to buy [Member] | Futures contract [member]
Assets
Notional Amount	29,840			150,036
Fair Value	0			0
Liabilities
Notional Amount	387,920			363,086
Fair Value	0			0
Foreign currency to sell [Member] | Forward contract [member]
Assets
Notional Amount	2,589,739			3,735,363
Fair Value	55,260			124,565
Liabilities
Notional Amount	1,106,975			1,536,849
Fair Value	8,009			15,139
Foreign currency to sell [Member] | Futures contract [member]
Assets
Notional Amount	1,602,408			973,730
Fair Value	0			0
Liabilities
Notional Amount	1,153,316			190,545
Fair Value	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

DERIVATIVE INSTRUMENTS AND H137

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details 2)	12 Months Ended
	Dec. 31, 2017Variation	Dec. 31, 2016Variation	Dec. 31, 2015Variation
Discloser Of Derivative Instruments and Hedge Accounting [Abstract]
Value of US 1	2,984	3,000.71	3,149.47
Variation	(16.71)	(148.76)	757.01

DERIVATIVE INSTRUMENTS AND H138

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details 3) - Hedges of net investment in foreign operations [member] $ in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)		Dec. 31, 2016COP ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount					$ 3,997,933	$ 3,584,585	[1]
Amount of hedge by financial liabilities in foreign currency					(2,169,649)	(2,121,200)
Amount of hedge by forward contracts					(1,815,058)	(1,447,149)
Cumulative translation adjustment of the investments		$ 3,211,272	[2]	$ 3,258,469
Exchange difference of financial liabilities		(1,098,972)	[2]	(1,129,540)
Exchange difference in forward contracts		(2,245,919)		(2,262,751)
Net OCI account		(133,619)		(133,822)
Leasing Bogota Panama [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount					3,781,475	3,436,658	[1]
Amount of hedge by financial liabilities in foreign currency					(2,067,100)	(2,074,100)
Amount of hedge by forward contracts					(1,703,009)	(1,346,889)
Cumulative translation adjustment of the investments		3,065,281	[2]	3,115,527
Exchange difference of financial liabilities		(1,045,872)	[2]	(1,080,737)
Exchange difference in forward contracts		(2,155,488)		(2,171,234)
Net OCI account		(136,079)		(136,444)
Other subsidiaries and branches Banco de Bogota [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount	[3]				113,909	100,827	[1]
Amount of hedge by financial liabilities in foreign currency	[3]				0	0
Amount of hedge by forward contracts	[3]				(112,049)	(100,260)
Cumulative translation adjustment of the investments	[3]	92,891	[2]	94,139
Exchange difference of financial liabilities	[3]	0	[2]	0
Exchange difference in forward contracts	[3]	(90,431)		(91,517)
Net OCI account	[3]	2,460		2,622
Occidental Bank Barbados [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount					26,396	25,401	[1]
Amount of hedge by financial liabilities in foreign currency					(26,396)	(25,401)
Amount of hedge by forward contracts					0	0
Cumulative translation adjustment of the investments		18,740	[2]	19,176
Exchange difference of financial liabilities		(18,740)	[2]	(19,176)
Exchange difference in forward contracts		0		0
Net OCI account		0		0
Banco de Occidente S.A. [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount					25,044	21,699	[1]
Amount of hedge by financial liabilities in foreign currency					(25,044)	(21,699)
Amount of hedge by forward contracts					0	$ 0
Cumulative translation adjustment of the investments		29,979	[2]	29,627
Exchange difference of financial liabilities		(29,979)	[2]	(29,627)
Exchange difference in forward contracts		0		0
Net OCI account		0		$ 0
Sociedad Portuaria El Cayao S.A. E.S.P. [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount	[4]				25,000
Amount of hedge by financial liabilities in foreign currency	[4]				(25,000)
Amount of hedge by forward contracts	[4]				0
Cumulative translation adjustment of the investments	[2],[4]	2,207
Exchange difference of financial liabilities	[2],[4]	(2,207)
Exchange difference in forward contracts	[4]	0
Net OCI account	[4]	0
Gases del Pacifico S.A.C. [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount	[4]				10,214
Amount of hedge by financial liabilities in foreign currency	[4]				(10,214)
Amount of hedge by forward contracts	[4]				0
Cumulative translation adjustment of the investments	[2],[4]	902
Exchange difference of financial liabilities	[2],[4]	(902)
Exchange difference in forward contracts	[4]	0
Net OCI account	[4]	0
Gas Natural de Lima y Callao S.A.C. - Calidda [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Investment amount	[4]				15,895
Amount of hedge by financial liabilities in foreign currency	[4]				(15,895)
Amount of hedge by forward contracts	[4]				$ 0
Cumulative translation adjustment of the investments	[2],[4]	1,272
Exchange difference of financial liabilities	[2],[4]	(1,272)
Exchange difference in forward contracts	[4]	0
Net OCI account	[4]	$ 0
[1]	Includes only exposure hedged under hedge accounting.
[2]	Includes exchange difference hedged
[3]	Includes Banco de Bogotá Panamá, Banco Bogotá Finance, Ficentro and contributions of foreign branches in Miami, New York and Nassau.
[4]	Includes only a portion of this investments hedged.

DERIVATIVE INSTRUMENTS AND H139

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details 4) - Cash flow hedges [member] $ in Millions	Dec. 31, 2017COP ($)Number	Dec. 31, 2016COP ($)Number
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Income in U.S. dollars forecasted | $	$ 41,614	$ 142,731
Notional amount contracts forward U.S. dollars | Number	41,614	99,912
% hedged	100.00%	70.00%
Fair value in Colombian pesos | $	$ 4,303	$ 4,824
# of contracts | Number	468	892

DERIVATIVE INSTRUMENTS AND H140

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details 5) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Balance at the beginning of the year	$ 749,617			$ 976,597	$ 698,038
Balance at the end of the year	786,866	$ 263.7		749,617	976,597
Cash flow hedges [member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Balance at the beginning of the year	6,210			(11,757)	(26,790)
Changes in the fair value of the hedge forward contracts	24,506			12,930	31,575
Transferred to profit or loss	(26,846)			5,037	(16,542)
Balance at the end of the year	$ 3,870			$ 6,210	$ (11,757)
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

DERIVATIVE INSTRUMENTS AND H141

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Details Textual) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016USD ($)	Nov. 02, 2016USD ($)	Dec. 21, 2015USD ($)
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Other financial liabilities				$ 103		$ 47
Hedging instrument, liabilities	$ 13,464	$ 43,436		4.5	[1]
Hedging instrument, assets	55,261	128,479		$ 18.5	[1]
Reclassification adjustments on cash flow hedges, net of tax	(26,846)	$ 5,037	$ (16,542)
Intra group liability [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Gains (losses) on exchange differences of intra group liability	$ 73,705
Foreign investment hedging [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Hedging instrument, liabilities							$ 500
Bottom of range [member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Percentage of hedging effectiveness	80.00%			80.00%
Top of range [member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Percentage of hedging effectiveness	125.00%			125.00%
Leasing Bogota Panama [Member] | Foreign investment hedging [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Hedging instrument, liabilities								$ 500
Hedges of net investment in foreign operations [member] | Leasing Bogota Panama [Member] | Foreign investment hedging [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Bonds issued designated as hedging instruments				$ 2,067		$ 2,074
Cash flow hedges [member] | Banco de Bogota [Member]
Discloser Of Derivative Instruments and Hedge Accounting [Line Items]
Hedging instrument, assets							$ 500
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

LOANS (Details)

LOANS (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	$ 166,372,776	$ 155,160,176
Leasing presentation adjustment	0	0
Balance according to disclosure	166,372,776	155,160,176
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	99,428,894	93,149,211
Leasing presentation adjustment	(9,892,400)	(9,958,095)
Balance according to disclosure	89,536,494	83,191,116
Consumer [member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	50,382,895	46,927,997
Leasing presentation adjustment	(226,764)	(215,608)
Balance according to disclosure	50,156,131	46,712,389
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	16,151,299	14,683,537
Leasing presentation adjustment	(1,047,766)	(902,104)
Balance according to disclosure	15,103,533	13,781,433
Microcredit [member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	409,688	399,431
Leasing presentation adjustment	0	0
Balance according to disclosure	409,688	399,431
Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Balance in Statement of financial position	0	0
Leasing presentation adjustment	11,166,930	11,075,807
Balance according to disclosure	$ 11,166,930	$ 11,075,807

LOANS (Details 1)

LOANS (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of loans and receivables [Line Items]
Allowance for impairment of financial assets from the loan portfolio	$ (5,618,481)			$ (4,261,444)
Loans and receivables, net	160,754,295	$ 53,872		150,898,732
Total gross credit portfolio [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	166,372,776			155,160,176
General purpose loans [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	64,153,372			60,561,432
Personal loans [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	30,553,566			28,308,406
Working capital loans [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	14,723,490			15,524,372
Mortgages [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	15,103,533			13,781,433
Credit cards [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	13,846,823			12,781,182
Commercial financial leases [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	9,892,402			9,958,096
Consumer financial leases [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	226,764			215,608
Automobile and vehicle loans [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	5,896,640			5,736,357
Interbank and overnight funds [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	7,279,047			3,569,587
Loans funded by development banks [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	2,713,818			2,829,091
Housing leases [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	1,047,766			902,104
Overdrafts [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	525,867			593,077
Microcredit [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	$ 409,688			$ 399,431
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

LOANS (Details 2)

LOANS (Details 2) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of loans and receivables [Line Items]
Beginning balance	$ 4,261,444
Ending balance	5,618,481	$ 1,882.9		$ 4,261,444
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Beginning balance	1,814,944			1,679,229	$ 1,448,771
Allowance of the period charged to profit or loss	1,825,905			1,522,077	1,310,679
Recovery of provisions with partial payment to profit or loss	(584,091)			(857,465)	(663,931)
Charge-offs of the year	(400,653)			(495,326)	(198,727)
Sale of portfolio	0
Exchange differences	3,217			(33,571)	(217,563)
Ending balance	2,659,322			1,814,944	1,679,229
Consumer [member]
Disclosure of loans and receivables [Line Items]
Beginning balance	2,022,825			1,679,147	1,404,743
Allowance of the period charged to profit or loss	3,403,092			3,088,950	2,182,141
Recovery of provisions with partial payment to profit or loss	(780,874)			(976,258)	(916,030)
Charge-offs of the year	(2,165,857)			(1,759,896)	(1,304,058)
Sale of portfolio	(24,503)
Exchange differences	2,108			(9,118)	312,351
Ending balance	2,456,791			2,022,825	1,679,147
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Beginning balance	124,100			95,102	70,709
Allowance of the period charged to profit or loss	81,189			75,059	42,313
Recovery of provisions with partial payment to profit or loss	(28,051)			(37,863)	(24,797)
Charge-offs of the year	(45,918)			(15,828)	(14,160)
Sale of portfolio	0
Exchange differences	(438)			7,630	21,037
Ending balance	130,882			124,100	95,102
Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Beginning balance	236,438			215,640	185,772
Allowance of the period charged to profit or loss	222,043			225,498	214,797
Recovery of provisions with partial payment to profit or loss	(112,671)			(162,033)	(97,012)
Charge-offs of the year	(46,754)			(55,234)	(86,405)
Sale of portfolio	0
Exchange differences	(1,737)			12,567	(1,512)
Ending balance	297,319			236,438	215,640
Microcredit [member]
Disclosure of loans and receivables [Line Items]
Beginning balance	63,137			49,206	47,808
Allowance of the period charged to profit or loss	64,627			72,917	37,506
Recovery of provisions with partial payment to profit or loss	(29,237)			(18,119)	(14,505)
Charge-offs of the year	(24,360)			(28,703)	(33,096)
Sale of portfolio	0
Exchange differences	0			(12,164)	11,493
Ending balance	74,167			63,137	49,206
Total [Member]
Disclosure of loans and receivables [Line Items]
Beginning balance	4,261,444			3,718,324	3,157,803
Allowance of the period charged to profit or loss	5,596,856			4,984,501	3,787,436
Recovery of provisions with partial payment to profit or loss	(1,534,924)			(2,051,738)	(1,716,275)
Charge-offs of the year	(2,683,542)			(2,354,987)	(1,636,446)
Sale of portfolio	(24,503)
Exchange differences	3,150			(34,656)	125,806
Ending balance	$ 5,618,481			$ 4,261,444	$ 3,718,324
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

LOANS (Details 3)

LOANS (Details 3) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of loans and receivables [Line Items]
Impairment provision:		$ 5,618,481	$ 1,882.9		$ 4,261,444
Total gross credit portfolio [Member]
Disclosure of loans and receivables [Line Items]
Loans and receivables		166,372,776			155,160,176
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		2,659,322			1,814,944	$ 1,679,229	$ 1,448,771
Loans and receivables		89,536,494			83,191,116
Consumer [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		2,456,791			2,022,825	1,679,147	1,404,743
Loans and receivables		50,156,131			46,712,389
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		130,882			124,100	95,102	70,709
Loans and receivables		15,103,533			13,781,433
Microcredit [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		74,167			63,137	49,206	47,808
Loans and receivables		409,688			399,431
Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		297,319			236,438	$ 215,640	$ 185,772
Loans and receivables		11,166,930			11,075,807
Loans assessed collectively [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		4,127,448			3,461,950
Loans and receivables		111,015,017			101,380,024
Loans assessed collectively [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		1,296,007			1,090,422
Loans and receivables		39,689,559			34,625,723
Loans assessed collectively [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		2,456,721			2,022,778
Loans and receivables		50,104,363			46,619,979
Loans assessed collectively [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		130,101			123,273
Loans and receivables		15,088,599			13,772,927
Loans assessed collectively [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		74,167			63,137
Loans and receivables		409,688			399,431
Loans assessed collectively [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		170,452			162,340
Loans and receivables		5,722,808			5,961,964
Loans assessed individually [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		1,491,033			799,494
Loans and receivables	[2]	55,357,759			53,780,152
Loans assessed individually [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		1,363,315			724,522
Loans and receivables	[2]	49,846,935			48,565,393
Loans assessed individually [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		70			47
Loans and receivables	[2]	51,768			92,410
Loans assessed individually [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		781			827
Loans and receivables	[2]	14,934			8,506
Loans assessed individually [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		0			0
Loans and receivables	[2]	0			0
Loans assessed individually [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Impairment provision:		126,867			74,098
Loans and receivables	[2]	$ 5,444,122			$ 5,113,843
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Loans individually evaluated for impairment that are not considered impaired, additionally are evaluated collectively for impairment according to historical losses experience adjusted to reflect current economic conditions.

LOANS (Details 4)

LOANS (Details 4) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	$ 4,941,777	$ 3,887,301
Collateral Guarantees	1,196,882	1,079,367
Allowance Recognized	(5,618,481)	(4,261,444)
Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	1,491,033	799,494
Without recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	367,252	401,344
Collateral Guarantees	806,906	692,943
Without recognized provision [Member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	0	0
With recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	4,574,525	3,485,957
Collateral Guarantees	389,976	386,424
Allowance Recognized	1,491,033	799,494
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	4,153,165	3,418,985
Collateral Guarantees	471,033	429,807
Commercial loans [member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	1,363,315	724,522
Commercial loans [member] | Without recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	180,527	262,831
Collateral Guarantees	242,366	208,604
Commercial loans [member] | Without recognized provision [Member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	0	0
Commercial loans [member] | With recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	3,972,638	3,156,154
Collateral Guarantees	228,667	221,203
Allowance Recognized	1,363,315	724,522
Consumer loans [member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	233	141
Collateral Guarantees	0	0
Consumer loans [member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	70	47
Consumer loans [member] | With recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	233	141
Collateral Guarantees	0	0
Allowance Recognized	70	47
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	1,907	1,907
Collateral Guarantees	0	0
Mortgage [member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	781	827
Mortgage [member] | With recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	1,907	1,907
Collateral Guarantees	0	0
Allowance Recognized	781	827
Lease receivables [member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	786,472	466,268
Collateral Guarantees	725,849	649,560
Lease receivables [member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	126,867	74,098
Lease receivables [member] | Without recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	186,725	138,513
Collateral Guarantees	564,540	484,339
Lease receivables [member] | Without recognized provision [Member] | Financial assets individually assessed for credit losses [member]
Disclosure of loans and receivables [Line Items]
Allowance Recognized	0	0
Lease receivables [member] | With recognized provision [Member]
Disclosure of loans and receivables [Line Items]
Gross Amount Registered	599,747	327,755
Collateral Guarantees	161,309	165,221
Allowance Recognized	$ 126,867	$ 74,098

LOANS (Details 5)

LOANS (Details 5) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	$ 166,372,776	$ 155,160,176
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	89,536,494	83,191,116
Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	50,156,131	46,712,389
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	15,103,533	13,781,433
Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	409,688	399,431
Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	11,166,930	11,075,807
Less than a year [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	63,967,315	55,324,846
Less than a year [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	44,888,149	36,982,196
Less than a year [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	16,240,350	15,207,864
Less than a year [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	469,702	396,964
Less than a year [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	209,364	166,719
Less than a year [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	2,159,750	2,571,103
From 1 to 3 year [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	34,651,451	33,702,870
From 1 to 3 year [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	19,651,034	19,083,900
From 1 to 3 year [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	11,146,916	10,928,357
From 1 to 3 year [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	785,736	706,364
From 1 to 3 year [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	178,052	208,759
From 1 to 3 year [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	2,889,713	2,775,490
From 3 to 5 years [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	23,269,625	22,091,491
From 3 to 5 years [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	11,088,553	10,957,767
From 3 to 5 years [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	8,809,557	8,188,856
From 3 to 5 years [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	857,039	732,454
From 3 to 5 years [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	17,707	19,610
From 3 to 5 years [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	2,496,769	2,192,804
More than 5 years [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	44,484,385	44,040,969
More than 5 years [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	13,908,758	16,167,253
More than 5 years [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	13,959,308	12,387,312
More than 5 years [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	12,991,056	11,945,651
More than 5 years [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	4,565	4,343
More than 5 years [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	$ 3,620,698	$ 3,536,410

LOANS (Details 6)

LOANS (Details 6) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total gross credit portfolio [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	$ 166,372,776	$ 155,160,176
Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	89,536,494	83,191,116
Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	50,156,131	46,712,389
Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	15,103,533	13,781,433
Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	409,688	399,431
Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	11,166,930	11,075,807
Colombian Pesos [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	104,555,137	98,654,717
Colombian Pesos [member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	56,516,054	54,026,331
Colombian Pesos [member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	32,822,355	30,452,658
Colombian Pesos [member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	5,674,639	4,822,806
Colombian Pesos [member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	409,688	399,431
Colombian Pesos [member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	9,132,401	8,953,491
Foreign Currency [Member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	61,817,639	56,505,459
Foreign Currency [Member] | Commercial loans [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	33,020,440	29,164,785
Foreign Currency [Member] | Consumer [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	17,333,776	16,259,731
Foreign Currency [Member] | Mortgage [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	9,428,894	8,958,627
Foreign Currency [Member] | Microcredit [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	0	0
Foreign Currency [Member] | Financial Leasing [member]
Disclosure of loans and receivables [Line Items]
Loans and advances to customers	$ 2,034,529	$ 2,122,316

LOANS (Details 7)

LOANS (Details 7) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of loans and receivables [Line Items]
Total gross rent payments receivable	$ 16,445,998	$ 17,071,858
Less amounts representing running costs (such as taxes, maintenance, insurances ,etc.,)	(225)	(2,527)
Plus Estimated residual amount of assets given for rental (without guarantee)	21,673	21,162
Gross investment in contracts of financial leasing	16,467,446	17,090,493
Less unrealized financial income	(5,300,516)	(6,014,686)
Net investment in contracts of financial leasing	11,166,930	11,075,807
Impairment of net investment in financial leasing	$ (297,319)	$ (236,438)

LOANS (Details 8)

LOANS (Details 8) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of loans and receivables [Line Items]
Gross investment	$ 16,467,446	$ 17,090,493
Net investment	11,166,930	11,075,807
Up to 1 year [member]
Disclosure of loans and receivables [Line Items]
Gross investment	2,147,421	2,711,147
Net investment	1,614,889	2,128,441
From 1 to 5 years [member]
Disclosure of loans and receivables [Line Items]
Gross investment	6,428,242	6,375,267
Net investment	4,986,723	4,798,364
More than 5 years [member]
Disclosure of loans and receivables [Line Items]
Gross investment	7,891,783	8,004,079
Net investment	$ 4,565,318	$ 4,149,002

LOANS (Details Textual)

LOANS (Details Textual)	12 Months Ended
	Dec. 31, 2017
Disclosure of loans and receivables [Line Items]
Description of collateral held and other credit enhancements, financial assets that are individually determined to be impaired	The detailed information of credit risk impairment provisions accrued as of December 31, 2017 and 2016, taking into account how they were determined individually for loans above of Ps. 2,000 and collectively for other credits. Loans individually assessed for impairment lower than Ps. 2,000 are considered in the allowances for each type of credit.
Vehicles and computer equipment [Member]
Disclosure of loans and receivables [Line Items]
Borrowings, maturity	36 and 60 months
Machinery and equipments [Member]
Disclosure of loans and receivables [Line Items]
Borrowings, maturity	60 to 120 months
Housing leasing [Member]
Disclosure of loans and receivables [Line Items]
Borrowings, maturity	120 to 240 months

OTHER ACCOUNTS RECEIVABLE, N152

OTHER ACCOUNTS RECEIVABLE, NET (Details) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016COP ($)
Disclosure of other accounts receivables [Line Items]
Accounts receivables for goods and services sales in non-financial sector companies		$ 1,070,936		$ 1,066,628
Financial assets in concession contract at amortized cost		786,018		203,241
Credit card compensations and network compensation		426,090		249,430
Fees, services and advances		258,850		272,488
Dormant customer deposits ICETEX	[1]	256,806		237,034
Payment in advance		228,765		262,473
Debtors		224,340		178,785
Commissions		186,646		131,867
Transfers In Process		185,634		166,153
Deposits		142,168		138,520
Payment in advance to supplier's contract		117,858		39,309
Holding and parent establishment		114,513		230,950
Transfers to the National Treasury		58,042		52,351
Storage services		43,767		41,282
Quota shares retirement pensions		28,485		30,396
Claims to insurance companies		14,450		19,201
Dividends		3,561		16,263
Deductible taxes		11,961		15,611
Promissory sellers		15,144		11,661
Payment in advance for industry and trade taxes		13,392		11,553
Others		278,708		344,476
Gross balance of other accounts receivable		4,466,134		3,719,672
Impairment allowance		(226,862)		(195,078)
Other accounts receivable, net		$ 4,239,272	$ 1,420.7	$ 3,524,594
[1]	Pursuant to Colombian Law number 1777 of 2016, financial institutions in Colombia since August 1, 2016, must transfer the funds from clients’ in dormant customer deposits to a special fund as a loan to a Colombian Government entity denominated “ICETEX”, and classified as “Other accounts receivable” given it is permanently deemed refundable by any particular client. This Government entity Fund is responsible for managing the monies funds with the commitment to return them at the time the bank customer account holder requests them. Dormant client’s customer deposits are accounts of savings or current accounts that exceed the 322 UVR (Real Value Units) equivalent to Ps. 81,663 pesos, on which no deposit, withdrawal, transfer or, in general, debit or credit movements have been made during an uninterrupted period of three years.

OTHER ACCOUNTS RECEIVABLE, N153

OTHER ACCOUNTS RECEIVABLE, NET (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of other accounts receivables [Line Items]
Balance at the beginning of the year	$ 195,078
Recovery for partial payments from the clients	(804,970)	$ (269.8)		$ (414,734)	$ (1,047,374)
Balance at the end of the year	226,862			195,078
Other Accounts Receivable [Member]
Disclosure of other accounts receivables [Line Items]
Balance at the beginning of the year	195,078			194,450	222,385
Provision charged to profit or loss	98,024			105,942	96,775
Recovery for partial payments from the clients	(18,383)			(32,514)	(40,185)
Charge-offs	(48,171)			(72,120)	(85,880)
Exchange gains (losses) in foreign currency	314			(680)	1,355
Balance at the end of the year	$ 226,862			$ 195,078	$ 194,450
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

OTHER ACCOUNTS RECEIVABLE, N154

OTHER ACCOUNTS RECEIVABLE, NET (Details Textual) $ in Millions	Dec. 31, 2017COP ($)
Disclosure of other accounts receivables [Line Items]
Dormant Client Deposits Exceed Value	$ 81,663

NON-CURRENT ASSETS HELD FOR 155

NON-CURRENT ASSETS HELD FOR SALE (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[2]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of non-current assets held for sale [Line Items]
Balance at the beginning of the year		$ 259,527			$ 199,475	$ 211,247
Additions		89,216			236,632	93,698
Assets sold		(78,784)			(130,784)	(104,940)
Charged-offs		0			0	(5,786)
Changes in fair value		(37,818)			(34,572)	(12,159)
Reclassifications	[1]	(134,795)			(5,631)	(24,901)
Exchange gains in foreign currency		4,036			(5,593)	42,316
Balance at year end balance		101,382	$ 34		259,527	$ 199,475
Non-current assets held for sale [member]
Disclosure of non-current assets held for sale [Line Items]
Balance at the beginning of the year		259,527
Balance at year end balance		$ 101,382			$ 259,527
[1]	Includes reclassifications to: I) Investment properties by PS. (108,924); II) Investments by Ps. (23,368) and III) Other assets by Ps. (2,503).
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

NON-CURRENT ASSETS HELD FOR 156

NON-CURRENT ASSETS HELD FOR SALE (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	$ 101,382	$ 34		$ 259,527	$ 199,475	$ 211,247
Non-current assets held for sale [member]
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	101,382			259,527
Foreclosed assets
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	77,250			178,017
Assets received from leasing agreements
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	19,226			58,563
Other non-current assets held for sale
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	4,906			22,947
Movable property | Foreclosed assets
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	8,523			103,569
Residential real estate | Foreclosed assets
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	31,666			36,368
Other real estate | Foreclosed assets
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	37,061			38,080
Other real estate | Other non-current assets held for sale
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	982			0
Machinery and equipment | Assets received from leasing agreements
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	15,640			25,035
Vehicles | Assets received from leasing agreements
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	1,623			6,320
Real estate | Assets received from leasing agreements
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	1,963			27,208
Lands | Other non-current assets held for sale
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	0			8,396
Other | Other non-current assets held for sale
Disclosure of non-current assets held for sale [Line Items]
Non-current assets or disposal groups classified as held for sale	$ 3,924			$ 14,551
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

NON-CURRENT ASSETS HELD FOR 157

NON-CURRENT ASSETS HELD FOR SALE (Details 2) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of non-current assets held for sale [Line Items]
Liabilities included in disposal groups classified as held for sale	$ 18,382	$ 13,884
Commercial accounts payable
Disclosure of non-current assets held for sale [Line Items]
Liabilities included in disposal groups classified as held for sale	$ 18,382	$ 13,884

INVESTMENTS IN ASSOCIATES AN158

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of investments in associates and joint ventures [Abstract]
Associates	$ 925,823			$ 865,410
Joint ventures	117,191			281,237
Total	$ 1,043,014	$ 349.5		$ 1,146,647
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INVESTMENTS IN ASSOCIATES AN159

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details 1) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure of investments in associates and joint ventures [Line Items]
Book value		$ 925,823	$ 865,410
A.C.H Colombia S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		34.00%	34.00%
Book value		$ 12,357	$ 10,467
Redeban Multicolor S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		20.00%	20.00%
Book value		$ 19,529	$ 18,421
Aerocali S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		50.00%	50.00%
Book value		$ 17,633	$ 24,971
Colombiana de Extrusion S.A. Extrucol
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		30.00%	30.00%
Book value		$ 11,476	$ 11,354
Concesionaria Tibitoc S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		33.00%	33.00%
Book value		$ 20,165	$ 20,209
Metrex S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		18.00%	18.00%
Book value		$ 2,559	$ 2,239
C.I. Acepalma S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[1]	11.00%	11.00%
Book value	[1]	$ 5,625	$ 4,367
Gases del Caribe S.A. E.S.P.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		31.00%	31.00%
Book value		$ 269,739	$ 218,432
Concentra Inteligencia en Energia S.A.S.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		24.00%	24.00%
Book value		$ 603	$ 557
Energía Eficiente S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		39.00%	39.00%
Book value		$ 6,927	$ 6,678
Credibanco [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[2]	25.00%	25.00%
Book value	[2]	$ 196,071	$ 192,893
Gas natural de lima y callao s.a. calidda s.a [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		40.00%	40.00%
Book value		$ 363,139	$ 354,822
[1]	Grupo Aval has significant influence over C.I. Acepalma S.A. due to its participation in the Board of Directors.
[2]	Since November 30, 2016, Grupo Aval has significant influence on Credibanco. Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate.

INVESTMENTS IN ASSOCIATES AN160

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details 2) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest		33.00%
Book value		$ 117,191	$ 281,237
Cfc Sk Eldorado Latam Advisory Company S.A.S.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[1]	50.00%	50.00%
Book value	[1]	$ 345	$ 258
Cfc Sk El Dorado Latam Management Company Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[1]	50.00%	50.00%
Book value	[1]	$ 4,568	$ 2,993
Cfc Sk El Dorado Latam Capital Partner Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[1]	50.00%	50.00%
Book value	[1]	$ 495	$ 472
Cfc Sk El Dorado Latam Fund L.P.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[1]	0.00%	50.00%
Book value	[1]	$ 0	$ 12,395
Concesionaria Ruta Del Sol S.A.S.
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[2]	33.00%	33.00%
Book value	[2]	$ 111,783	$ 252,474
Concesionaria Vial Del Pacífico
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[3]	0.00%	50.00%
Book value	[3]	$ 0	$ 1,479
Concesionaria Nueva Vía Al Mar
Disclosure of investments in associates and joint ventures [Line Items]
Ownership interest	[3]	0.00%	60.00%
Book value	[3]	$ 0	$ 11,166
[1]	Different joint businesses executed by Grupo Aval’s subsidiaries with specific purposes wherein the joint business assumes no responsibilites for business results, not requiring significant equity resources from Grupo Aval. In June 2017 Cfc Sk El Dorado Latam Fund L.P. went from being a Joint venture to an investment in equity securities in the trading portfolio.
[2]	Estudios Proyectos del Sol S.A.S ("Episol"), 100% owned subsidiary of Corficolombiana S.A. carried out an impairment analysis on its investment in Concesionaria Ruta del Sol S.A.S (CRDS), a company in which it participates in 33% of its share capital, reflecting an adjustment in the amount of Ps.140,691 for 2017. The attribuitable part of the Episol (CRDS) adjustment amounted to Ps. 63,015.The balance of this investment after the impairment expense amounts to Ps.111,783. Matters referring to the nullity of the Ruta del Sol Sector 2 contract ("Concession Contract"), the claims of the parties, the Settlement Completion and Early Eventual Termination Agreement signed in February 2017, the liquidation formula of the Concession Contract, the liquidation value of the work and the amounts to be recognized are the subject of debate within the framework of the Arbitration Tribunal that will resolve the differences between CRDS and the Agencia Nacional de Infraestructura - ANI. Although no award has been made and no date is known for said award to be made, Episol considered it appropriate to make the aforementioned impairment expense on the value of its investment. Notwithstanding the foregoing, Episol will continue to defend its legitimate rights and interests in the aforementioned arbitration process, and in any other forum that may be required.
[3]	As of December 2017, the investment ceased to be a Joint Venture and became a subsidiary. (See note 17, this acquisition is considered non-significant).

INVESTMENTS IN ASSOCIATES AN161

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details 3) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of investments in associates and joint ventures [Line Items]
Balance at the beginning of the year		$ 865,410
Participation in Other Comprehensive Income		37,249	$ 25.2		$ 302,207	$ 278,559
Year-end balance		117,191			281,237
Joint ventures [member]
Disclosure of investments in associates and joint ventures [Line Items]
Balance at the beginning of the year		281,237			282,222	177,103
Participation in the profit or loss of the period		1,615			(7,102)	108,835
Participation in Other Comprehensive Income		(7)			(2,112)	1,538
Dividends received		0			0	(6,460)
Capitalization		87			17,282	0
Allowance for Impairment	[2]	(140,691)			(5,892)	0
Transfers / Reclassification		(12,405)			(3,569)	1,206
Exchange difference		0			408	0
Balance acquired in business combination		(12,645)			0	0
Year-end balance		117,191			281,237	282,222
Associates [member]
Disclosure of investments in associates and joint ventures [Line Items]
Balance at the beginning of the year		865,410			645,377	540,082
Acquisitions		0			16	0
Gain in non-monetary transactions	[3]	0			195,514	0
Participation in the profit or loss of the period		170,349			147,867	121,563
Participation in Other Comprehensive Income		1,135			(17,949)	30,426
Dividends received		(107,812)			(96,375)	(39,188)
Capitalization reductions		0			(4,746)
Allowance for Impairment		0			(4,027)	0
Transfers / Reclassification		0			0	(6,524)
Exchange difference		(3,259)			(267)	(982)
Year-end balance		$ 925,823			$ 865,410	$ 645,377
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Impairment of the investment in the Concesionaria Conjunto Ruta del Sol S.A.S joint businesses (CRDS).
[3]	Since November 30, 2016, Grupo Aval has significant influence on Credibanco. On August 26, 2016 Credibanco’s General Shareholders Meeting agreed to transform the society from a non-profit organization to a Limited Liability Company, which is now accounted for as an associate.

INVESTMENTS IN ASSOCIATES AN162

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details 4) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2014COP ($)
Disclosure of investments in associates and joint ventures [Line Items]
Assets	$ 236,538,540	$ 224,073,721		$ 79,268.9
Liabilities	210,667,313	199,414,499		70,598.8
Equity	25,871,227	24,659,222	$ 22,906,280	$ 8,670.1		$ 21,355,964
Income	26,624,025	25,937,238	21,147,421
Expenses	23,461,592	22,420,302	$ 17,801,735
A.C.H Colombia S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	56,670	48,243
Liabilities	20,119	17,282
Equity	36,551	30,961
Income	69,120	59,991
Expenses	54,746	47,275
Net income	14,374	12,716
Redeban Multicolor S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	177,667	161,093
Liabilities	81,001	69,912
Equity	96,666	91,181
Income	160,470	132,626
Expenses	149,902	127,020
Net income	10,568	5,606
Credibanco S.A.
Disclosure of investments in associates and joint ventures [Line Items]
Assets	253,991	365,559
Liabilities	84,294	212,085
Equity	169,697	153,474
Income	207,592	203,214
Expenses	180,422	184,342
Net income	27,170	18,872
Aerocali S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	133,977	146,783
Liabilities	99,008	96,841
Equity	34,969	49,942
Income	117,169	130,743
Expenses	100,900	104,850
Net income	16,269	25,893
Colombiana de Extrusion S.A. Extrucol [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	68,059	59,338
Liabilities	29,807	20,148
Equity	38,252	39,190
Income	65,870	79,876
Expenses	62,201	67,585
Net income	3,669	4,560
Concesionaria Tibitoc S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	79,566	88,521
Liabilities	19,069	27,894
Equity	60,497	60,627
Income	47,125	53,212
Expenses	34,003	37,063
Net income	13,122	16,149
Metrex S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	38,933	28,604
Liabilities	24,726	16,162
Equity	14,207	12,442
Income	47,763	43,997
Expenses	43,003	41,058
Net income	4,760	2,939
Calidda S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	2,441,398	2,230,186
Liabilities	1,536,738	1,343,129
Equity	904,660	887,057
Income	1,575,804	1,630,979
Expenses	1,402,709	1,462,514
Net income	173,095	168,465
Gases del Caribe S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	2,363,464	2,197,142
Liabilities	1,481,320	1,460,303
Equity	882,144	736,838
Income	1,577,041	1,818,142
Expenses	1,343,286	1,627,786
Net income	233,755	190,356
Concentra Inteligencia en Energia S.A.S. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	2,331	2,092
Liabilities	231	165
Equity	2,100	1,927
Income	1,634	1,670
Expenses	1,491	1,196
Net income	143	474
Energia Eficiente S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	40,853	41,643
Liabilities	23,142	25,045
Equity	17,711	16,598
Income	92,170	500,311
Expenses	89,709	491,584
Net income	2,461	8,728
C.I. Acepalma [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	290,406	211,211
Liabilities	240,547	172,455
Equity	49,859	38,756
Income	798,782	652,528
Expenses	789,925	645,524
Net income	8,857	7,004
Associates [member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	5,947,315	5,580,415
Liabilities	3,640,002	3,461,421
Equity	2,307,313	2,118,993
Income	4,760,540	5,307,289
Expenses	4,252,297	4,837,797
Net income	$ 508,243	$ 461,762
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INVESTMENTS IN ASSOCIATES AN163

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details 5) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)		Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2014COP ($)
Disclosure of investments in associates and joint ventures [Line Items]
Assets	$ 236,538,540		$ 224,073,721		$ 79,268.9
Liabilities	210,667,313		199,414,499		70,598.8
Equity	25,871,227		24,659,222	$ 22,906,280	$ 8,670.1		$ 21,355,964
Income	26,624,025		25,937,238	21,147,421
Expenses	23,461,592		22,420,302	$ 17,801,735
Cfc Sk Eldorado Latam Advisory Company S.A.S. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	893		1,015
Liabilities	204		499
Equity	689		516
Income	2,037		2,637
Expenses	1,877		2,265
Net income	159		372
Cfc Sk El Dorado Latam Management Company Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Assets	9,169		6,026
Liabilities	34		39
Equity	9,135		5,987
Income	3,584		3,003
Expenses	374		381
Net income	3,210		2,622
Cfc Sk Eldorado Latam Capital Partners, Ltd.
Disclosure of investments in associates and joint ventures [Line Items]
Assets	1,007		960
Liabilities	16		15
Equity	991		945
Income	0		(20)
Expenses	131		152
Net income	(131)		(172)
Cfc Sk El Dorado Latam Fund L.P. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets			37,545
Liabilities			12,582
Equity			24,963
Income			1,953
Expenses			9,655
Net income			(7,702)
Concesionaria Ruta del Sol S.A. [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets			3,653,227
Liabilities			2,578,230
Equity			1,074,997
Income			1,499,983
Expenses			1,207,910
Net income			292,073
Concesionaria Vial del Pacifico [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	424,888	[2]	246,184
Liabilities	424,379	[2]	243,221
Equity	509	[2]	2,963
Income	113,113	[2]	61,275
Expenses	115,567	[2]	61,506
Net income	(2,454)	[2]	(231)
Concesionaria Nueva Via al Mar [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	188,731	[2]	122,884
Liabilities	166,955	[2]	104,274
Equity	21,776	[2]	18,610
Income	26,215	[2]	27,408
Expenses	23,049	[2]	24,337
Net income	3,166	[2]	3,071
Joint ventures [member]
Disclosure of investments in associates and joint ventures [Line Items]
Assets	624,688		4,067,841
Liabilities	591,588		2,938,860
Equity	33,100		1,128,981
Income	144,949		1,596,239
Expenses	140,998		1,306,206
Net income	$ 3,950		$ 290,033
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	As of December 2017, the investment stopped being a Joint Venture and became a controlled investment. (See note 15, this acquisition is considered non-significant).

INVESTMENTS IN ASSOCIATES AN164

INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of investments in associates and joint ventures [Line Items]
Proportion of ownership interest in joint venture	33.00%
Investments in joint ventures	$ 117,191	$ 281,237
Decrease in net income due to impairment of investments	63,015
Concesionaria Ruta del Sol [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Allowance for Impairment	140,691
Investments in joint ventures	$ 111,783
Episol S.A.S [Member]
Disclosure of investments in associates and joint ventures [Line Items]
Proportion of ownership interest in subsidiary	100.00%

TANGIBLE ASSETS (Details)

TANGIBLE ASSETS (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)		Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		$ 6,559,515				$ 6,514,048
Property, plant and equipment		6,654,006		$ 2,230		6,559,515	$ 6,514,048
Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	5,899,249				5,732,230
Property, plant and equipment	[2]	5,799,997				5,899,249	5,732,230
Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		2,076				3,360
Property, plant and equipment		4,076				2,076	3,360
Investment properties [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[3]	610,188				538,246
Property, plant and equipment	[3]	783,794				610,188	538,246
Biological assets at fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		48,002				240,212
Property, plant and equipment		66,139				48,002	240,212
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		9,054,173				8,758,542	7,344,992
Purchases or capitalized expenses		582,197				907,256	1,031,177
Withdrawals / Sales		(425,279)	[4]			(454,249)	(400,114)
Changes in fair value		60,178				68,324	127,691
Transfers to/from non-current assets held for sale		102,056				(7,385)	29,720
Adjustments for exchange differences		(65,404)				(138,320)	625,076
Reclassification of bearer plants balance	[5]					0
Effects of amendments in accounting policies of bearer plants.						(18,079)
Reclassifications		47,251	[6]			(61,916)
Property, plant and equipment		9,355,172				9,054,173	8,758,542
Gross carrying amount [member] | Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	8,388,936				7,969,593	6,758,740
Purchases or capitalized expenses	[2]	470,650				814,194	919,335
Withdrawals / Sales	[2]	(374,606)	[4]			(367,987)	(349,056)
Changes in fair value	[2]	0				0	0
Transfers to/from non-current assets held for sale	[2]	587				(18,704)	15,498
Adjustments for exchange differences	[2]	(65,404)				(138,320)	625,076
Reclassification of bearer plants balance	[2],[5]					188,177
Effects of amendments in accounting policies of bearer plants.	[2]					29
Reclassifications	[2]	77,394	[6]			(58,046)
Property, plant and equipment	[2]	8,497,557				8,388,936	7,969,593
Gross carrying amount [member] | Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		7,047				10,491	17,111
Purchases or capitalized expenses		3,102				362	1,119
Withdrawals / Sales		(2,467)	[4]			(3,806)	(7,739)
Changes in fair value		0				0	0
Transfers to/from non-current assets held for sale		0				0	0
Adjustments for exchange differences		0				0	0
Reclassification of bearer plants balance	[5]					0
Effects of amendments in accounting policies of bearer plants.						0
Reclassifications		0	[6]			0
Property, plant and equipment		7,682				7,047	10,491
Gross carrying amount [member] | Investment properties [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[3]	610,188				538,246	366,742
Purchases or capitalized expenses	[3]	84,036				71,268	75,458
Withdrawals / Sales	[3]	(28,431)	[4]			(61,786)	(22,945)
Changes in fair value	[3]	46,675				53,680	104,769
Transfers to/from non-current assets held for sale	[3]	101,469				11,319	14,222
Adjustments for exchange differences	[3]	0				0	0
Reclassification of bearer plants balance	[3],[5]					0
Effects of amendments in accounting policies of bearer plants.	[3]					0
Reclassifications	[3]	(30,143)	[6]			(2,539)
Property, plant and equipment	[3]	783,794				610,188	538,246
Gross carrying amount [member] | Biological assets at fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		48,002				240,212	202,399
Purchases or capitalized expenses		24,409				21,432	35,265
Withdrawals / Sales		(19,775)	[4]			(20,670)	(20,374)
Changes in fair value		13,503				14,644	22,922
Transfers to/from non-current assets held for sale		0				0	0
Adjustments for exchange differences		0				0	0
Reclassification of bearer plants balance	[5]					(188,177)
Effects of amendments in accounting policies of bearer plants.						(18,108)
Reclassifications		0	[6]			(1,331)
Property, plant and equipment		66,139				48,002	240,212
Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(2,492,071)				(2,243,410)	(1,455,207)
Withdrawals / Sales		276,840	[4]			130,195	162,508
Transfers to/from non-current assets held for sale		0				10,781	(364,282)
Adjustments for exchange differences		20,881				71,582	(194,653)
Reclassifications		(35,531)	[6]			(5,338)
Depreciation of the year charged against profit or loss		(463,892)				(455,852)	(391,776)
IAS 41 Adoption Effect - agriculture						(29)
Property, plant and equipment		(2,693,773)				(2,492,071)	(2,243,410)
Accumulated depreciation [Member] | Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	(2,487,188)				(2,236,346)	(1,445,970)
Withdrawals / Sales	[2]	274,804	[4]			126,782	156,830
Transfers to/from non-current assets held for sale	[2]	0				10,781	(364,282)
Adjustments for exchange differences	[2]	20,881				71,582	(194,653)
Reclassifications	[2]	(35,531)	[6]			(5,338)
Depreciation of the year charged against profit or loss	[2]	(463,133)				(454,620)	(388,271)
IAS 41 Adoption Effect - agriculture	[2]					(29)
Property, plant and equipment	[2]	(2,690,167)				(2,487,188)	(2,236,346)
Accumulated depreciation [Member] | Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(4,883)				(7,064)	(9,237)
Withdrawals / Sales		2,036	[4]			3,413	5,678
Transfers to/from non-current assets held for sale		0				0	0
Adjustments for exchange differences		0				0	0
Reclassifications		0	[6]			0
Depreciation of the year charged against profit or loss		(759)				(1,232)	(3,505)
Property, plant and equipment		(3,606)				(4,883)	(7,064)
Accumulated depreciation [Member] | Investment properties [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[3]	0				0	0
Withdrawals / Sales	[3]	0	[4]			0	0
Transfers to/from non-current assets held for sale	[3]	0				0	0
Adjustments for exchange differences	[3]	0				0	0
Reclassifications	[3]	0	[6]			0
Depreciation of the year charged against profit or loss	[3]	0				0	0
Property, plant and equipment	[3]	0				0	0
Accumulated depreciation [Member] | Biological assets at fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0				0	0
Withdrawals / Sales		0	[4]			0	0
Transfers to/from non-current assets held for sale		0				0	0
Adjustments for exchange differences		0				0	0
Reclassifications		0	[6]			0
Depreciation of the year charged against profit or loss		0				0	0
Property, plant and equipment		0				0	0
Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(2,587)				(1,084)	(3,052)
Withdrawals / Sales		(4,806)
Year impairment charge						(1,503)	1,968
Property, plant and equipment		(7,393)				(2,587)	(1,084)
Accumulated impairment [member] | Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	(2,499)				(1,017)	(2,726)
Withdrawals / Sales	[2]	(4,894)
Year impairment charge	[2]					(1,482)	1,709
Property, plant and equipment	[2]	(7,393)				(2,499)	(1,017)
Accumulated impairment [member] | Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(88)				(67)	(326)
Withdrawals / Sales		88
Year impairment charge						(21)	259
Property, plant and equipment		0				(88)	(67)
Accumulated impairment [member] | Investment properties [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[3]	0				0	0
Withdrawals / Sales	[3]	0
Year impairment charge	[3]					0	0
Property, plant and equipment	[3]	0				0	0
Accumulated impairment [member] | Biological assets at fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0				0	0
Withdrawals / Sales		0
Year impairment charge						0	0
Property, plant and equipment		$ 0				$ 0	$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Only includes assets for own use diferent than assets given in operating lease (see note 15.2)
[3]	The total of purchases of investment properties, includes Ps. 8,219 at December 2017 and Ps. 14,658 at December 2016, of assets received in total or partial settlement of the payment obligations of debtors.
[4]	The total of Withdrawals of for own use, includes Ps. (30,440) of the liquidation of “Consorcio Consol”.
[5]	As of January 1, 2016, Grupo Aval changed its accounting policy regarding the measurement of biological assets related to bearer plants, pursuant to IAS 16 amendment (Property, plant and equipment) and IAS 41 (Agriculture). Based on such amendment, bearer plants could be classified as property, plant and equipment for own use and accounted for under the cost model, according to IAS 16; then, they are depreciated during the estimated life of the bearer plants by using the production units method. The biological products of those bearer plants (fruits) are recognized according to IAS 41, at fair value with changes in profit or loss. Until December 31, 2015, bearer plants were recorded as biological assets at fair value with changes recognized in profit or loss. The effect of this accounting change had no material effect on Grupo Aval´s financial statements and for this reason previous financial statements were not adjusted for retrospective application. Other biological assets, including biological assets growing in the bearer plants, are recognized both at the time of their initial recognition and at the end of reporting period at fair value less disposal cost, except for biological assets for which their fair value cannot be measured reliably; in such case they are measured at cost less accumulated depreciation and impairment loss. Gains and losses arising from the initial and subsequent recognition at fair value of the agricultural products are included in profit or loss. Costs incurred in the agricultural production process are also recognized directly in profit or loss. Fair value of biological assets is determined using valuations performed by experienced internal professionals, using discounted cash flow models. The expected cash flows of the crop’s total life are determined by using the market price of the agricultural product currently in effect and the estimated productive life of plants, net of maintenance and harvest costs and of any other costs required for plant maintenance during the production period. Productive life of plants is estimated considering the age, location and type of product. Fair value of the biological assets is dependent on current market prices for each product.
[6]	The total of reclassification of for own use, includes Ps. 3,509 of the business combinations Covimar y Covipacifico (this acquisition is not significant).

TANGIBLE ASSETS (Details 1)

TANGIBLE ASSETS (Details 1) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		$ 6,654,006	$ 2,230		$ 6,559,515	$ 6,514,048
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		9,355,172			9,054,173	8,758,542	$ 7,344,992
Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(2,693,773)			(2,492,071)	(2,243,410)	(1,455,207)
Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(7,393)			(2,587)	(1,084)	(3,052)
Bearer plants [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment					196,425
Bearer plants [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment					199,090
Bearer plants [member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment					(2,665)
Bearer plants [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment					0
Property plant and equipment for own use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	5,799,997			5,899,249	5,732,230
Property plant and equipment for own use [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	8,497,557			8,388,936	7,969,593	6,758,740
Property plant and equipment for own use [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	(2,690,167)			(2,487,188)	(2,236,346)	(1,445,970)
Property plant and equipment for own use [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	[2]	(7,393)			(2,499)	$ (1,017)	$ (2,726)
Property plant and equipment for own use [Member] | Land [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		1,004,047			1,009,301
Property plant and equipment for own use [Member] | Land [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		1,007,788			1,010,753
Property plant and equipment for own use [Member] | Land [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Land [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(3,741)			(1,452)
Property plant and equipment for own use [Member] | Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		2,154,604			2,202,343
Property plant and equipment for own use [Member] | Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		2,640,644			2,598,571
Property plant and equipment for own use [Member] | Buildings [member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(485,924)			(396,015)
Property plant and equipment for own use [Member] | Buildings [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(116)			(213)
Property plant and equipment for own use [Member] | Office Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		330,501			338,529
Property plant and equipment for own use [Member] | Office Equipment [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		944,127			939,344
Property plant and equipment for own use [Member] | Office Equipment [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(613,400)			(600,743)
Property plant and equipment for own use [Member] | Office Equipment [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(226)			(72)
Property plant and equipment for own use [Member] | Computer Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		452,094			469,180
Property plant and equipment for own use [Member] | Computer Equipment [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		1,573,284			1,555,655
Property plant and equipment for own use [Member] | Computer Equipment [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(1,121,179)			(1,086,475)
Property plant and equipment for own use [Member] | Computer Equipment [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(11)			0
Property plant and equipment for own use [Member] | Motor vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		68,997			61,211
Property plant and equipment for own use [Member] | Motor vehicles [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		131,301			130,493
Property plant and equipment for own use [Member] | Motor vehicles [member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(62,304)			(69,282)
Property plant and equipment for own use [Member] | Motor vehicles [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Machinery [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		1,171,443			1,200,974
Property plant and equipment for own use [Member] | Machinery [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		1,362,242			1,352,413
Property plant and equipment for own use [Member] | Machinery [member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(187,500)			(150,677)
Property plant and equipment for own use [Member] | Machinery [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(3,299)			(762)
Property plant and equipment for own use [Member] | Silos [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		3,853			4,168
Property plant and equipment for own use [Member] | Silos [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		8,613			8,613
Property plant and equipment for own use [Member] | Silos [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(4,760)			(4,445)
Property plant and equipment for own use [Member] | Silos [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Warehouses [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		17,858			18,638
Property plant and equipment for own use [Member] | Warehouses [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		43,592			43,457
Property plant and equipment for own use [Member] | Warehouses [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(25,734)			(24,819)
Property plant and equipment for own use [Member] | Warehouses [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Advanced payments for acquisition of plant property and equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		6,974			17,455
Property plant and equipment for own use [Member] | Advanced payments for acquisition of plant property and equipment [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		6,974			17,455
Property plant and equipment for own use [Member] | Advanced payments for acquisition of plant property and equipment [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Advanced payments for acquisition of plant property and equipment [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Leasehold Improvements [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		166,113			155,222
Property plant and equipment for own use [Member] | Leasehold Improvements [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		348,431			307,289
Property plant and equipment for own use [Member] | Leasehold Improvements [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(182,318)			(152,067)
Property plant and equipment for own use [Member] | Leasehold Improvements [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Construction in Progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		211,120			225,803
Property plant and equipment for own use [Member] | Construction in Progress [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		211,120			225,803
Property plant and equipment for own use [Member] | Construction in Progress [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			0
Property plant and equipment for own use [Member] | Construction in Progress [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		0			$ 0
Property plant and equipment for own use [Member] | Bearer plants [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		212,393
Property plant and equipment for own use [Member] | Bearer plants [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		219,441
Property plant and equipment for own use [Member] | Bearer plants [member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		(7,048)
Property plant and equipment for own use [Member] | Bearer plants [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment		$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Only includes assets for own use diferent than assets given in operating lease (see note 15.2)

TANGIBLE ASSETS (Details 2)

TANGIBLE ASSETS (Details 2) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	$ 6,654,006	$ 2,230		$ 6,559,515	$ 6,514,048
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	9,355,172			9,054,173	8,758,542	$ 7,344,992
Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(7,393)			(2,587)	(1,084)	(3,052)
Property, plant and equipment under operating leases [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	4,076			2,076	3,360
Property, plant and equipment under operating leases [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	7,682			7,047	10,491	17,111
Property, plant and equipment under operating leases [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(3,606)			(4,883)
Property, plant and equipment under operating leases [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	0			(88)	$ (67)	$ (326)
Property, plant and equipment under operating leases [member] | Office Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	0			0
Property, plant and equipment under operating leases [member] | Office Equipment [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	203			264
Property, plant and equipment under operating leases [member] | Office Equipment [Member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(203)			(264)
Property, plant and equipment under operating leases [member] | Office Equipment [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	0			0
Property, plant and equipment under operating leases [member] | Computer Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	1,879			38
Property, plant and equipment under operating leases [member] | Computer Equipment [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	3,363			1,838
Property, plant and equipment under operating leases [member] | Computer Equipment [Member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(1,484)			(1,712)
Property, plant and equipment under operating leases [member] | Computer Equipment [Member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	0			(88)
Property, plant and equipment under operating leases [member] | Motor vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	1,793			1,908
Property, plant and equipment under operating leases [member] | Motor vehicles [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	3,627			3,876
Property, plant and equipment under operating leases [member] | Motor vehicles [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(1,834)			(1,968)
Property, plant and equipment under operating leases [member] | Motor vehicles [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	0			0
Property, plant and equipment under operating leases [member] | Machinery [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	404			130
Property, plant and equipment under operating leases [member] | Machinery [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	489			1,069
Property, plant and equipment under operating leases [member] | Machinery [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	(85)			(939)
Property, plant and equipment under operating leases [member] | Machinery [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

TANGIBLE ASSETS (Details 3)

TANGIBLE ASSETS (Details 3) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of finance lease and operating lease by lessor [line items]
Minimum finance lease payments receivable, at present value	$ 5,268	$ 3,107
Less than a year [member]
Disclosure of finance lease and operating lease by lessor [line items]
Minimum finance lease payments receivable, at present value	2,833	1,937
More than a year, less than 5 [member]
Disclosure of finance lease and operating lease by lessor [line items]
Minimum finance lease payments receivable, at present value	$ 2,435	$ 1,170

TANGIBLE ASSETS (Details 5)

TANGIBLE ASSETS (Details 5) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016COP ($)
Disclosure of detailed information about property, plant and equipment [line items]
Biological assets		$ 66,139	$ 22.2	$ 48,002
At fair value [member] | African palm [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Biological assets		26,555		22,814
At fair value [member] | Rubber Plantations [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Biological assets		24,158		14,605
Other at fair value [Member] | Rubber Plantations [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Biological assets	[1]	$ 15,426		$ 10,583
[1]	Includes short-term crops, livestock and fish farming.

TANGIBLE ASSETS (Details 6)

TANGIBLE ASSETS (Details 6) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [abstract]
Sales of biological goods	$ 43,788	$ 39,032	$ 46,458
Changes in fair value of biological assets	13,503	14,644	22,922
Subtotal	57,291	53,676	69,380
Costs and expenses	(37,313)	(27,067)	(37,045)
Depreciation of bearer plants	(3,405)	(2,665)	0
General administration costs and sales	(7,278)	(4,379)	(2,866)
Financial costs	(4,136)	(2,285)	(278)
Subtotal	(52,132)	(36,396)	(40,189)
Total net income	$ 5,159	$ 17,280	$ 29,191

TANGIBLE ASSETS (Details 7)

TANGIBLE ASSETS (Details 7) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	$ 783,794	$ 262.7		$ 610,188
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	583,572			457,519
Accumulated adjustments to fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	200,222			152,669
Land [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	525,511			391,156
Land [Member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	365,675			267,869
Land [Member] | Accumulated adjustments to fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	159,836			123,287
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	258,283			219,032
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	217,897			189,650
Buildings [member] | Accumulated adjustments to fair value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Investment property	$ 40,386			$ 29,382
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

TANGIBLE ASSETS (Details 8)

TANGIBLE ASSETS (Details 8) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about investment properties [Line Items]
Income from rents	$ 11,992	$ 5,183	$ 6,986
Direct operating expenses deriving from property investments which create income from rent	(1,053)	(321)	(1,798)
Direct operating expenses deriving from property investments which do not create income from rent	(4,239)	(1,328)	(762)
Net	$ 6,700	$ 3,534	$ 4,426

TANGIBLE ASSETS (Details Textua

TANGIBLE ASSETS (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]
Assets received in total or partial settlement of payment obligations of debtors	$ 8,219	$ 14,658
Consorcio consol [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognised in profit or loss, property, plant and equipment	(30,440)
Covimar y covipacifico [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Reclassification adjustment of property plant and equipment	$ 3,509

CONCESSION ARRANGEMENTS RIGH174

CONCESSION ARRANGEMENTS RIGHTS (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)		Dec. 31, 2017USD ($)	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of detailed information about service concession arrangements [line items]
Beginning balance		$ 4,091,516
Ending balance		4,799,696		$ 1,608.4	$ 4,091,516
Service concession arrangement [Member]
Disclosure of detailed information about service concession arrangements [line items]
Beginning balance		2,275,915			1,934,556	$ 1,857,935
Additions or new concession arrangements		698,749	[1]		408,040	369,983
Collections during the year		(162,271)			(327,607)	(400,703)
Adjustment to fair value credited to income		209,937			180,982	153,094
Changes in accounting estimates	[2]					(111,432)
Accrued interest		46,299			79,944	65,679
Ending balance		3,068,629			2,275,915	1,934,556
Service concession arrangement [Member] | At amortized cost[member] [Member]
Disclosure of detailed information about service concession arrangements [line items]
Beginning balance		203,241			42,864	119,337
Additions or new concession arrangements		698,749	[1]		408,040	369,983
Collections during the year		(162,271)			(327,607)	(400,703)
Adjustment to fair value credited to income		0			0	0
Changes in accounting estimates	[2]					(111,432)
Accrued interest		46,299			79,944	65,679
Ending balance		786,018			203,241	42,864
Service concession arrangement [Member] | At fair value [member]
Disclosure of detailed information about service concession arrangements [line items]
Beginning balance		2,072,674			1,891,692	1,738,598
Additions or new concession arrangements		0	[1]		0	0
Collections during the year		0			0	0
Adjustment to fair value credited to income		209,937			180,982	153,094
Changes in accounting estimates	[2]					0
Accrued interest		0			0	0
Ending balance		$ 2,282,611			$ 2,072,674	$ 1,891,692
[1]	The Corporación Financiera Colombiana - Corficolombiana S.A., acquired an additional 40% of the Concesionaria Vial del Pacífico S.A.S. and an additional 40% of the Concesionaria Nueva Vía al Mar S.A.S., both domiciled in Colombia, increasing amortized cost in Ps. 396,467 (this acquisition is considered non-significant).
[2]	During 2015, the subsidiaries Estudios, Proyectos e Inversiones de los Andes S.A. and Proyectos de Infraestructura S.A. reassessed the allocation of the fair value of two mixed concession contracts, between the financial asset and the intangible asset that arise from the contract, as a result of clarifications made to the contracts due to requirements for additional work. As a result, it was determined to perform an adjustment to their carrying amount by a reclassification of the amount of Ps. 111,432 from the financial assets at amortized cost included in other accounts receivable, to intangible assets.

CONCESSION ARRANGEMENTS RIGH175

CONCESSION ARRANGEMENTS RIGHTS (Details 1) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	$ 735,043
Ending Balance	848,681	$ 735,043
Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	2,805,314	2,390,702
Cost	591,955	676,419
Amortization of the year	(283,102)	(261,807)
Ending Balance	3,114,167	2,805,314
Accumulated depreciation, amortisation and impairment [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	(644,415)	(382,608)
Reclassification to PPE	841	(2,113)
Amortization of the year	(284,489)	(260,667)
Ending Balance	(927,517)	(644,415)
Withdrawals / Sales	630	973
Foreign exchange adjustment	(84)
Gross carrying amount [member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	1,053,851
Ending Balance	1,289,253	1,053,851
Gross carrying amount [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	3,449,729	2,773,310
Additions	610,909	612,179
Reclassification to PPE	(14,408)	68,591
Ending Balance	4,041,684	3,449,729
Withdrawals / Sales	(3,505)	(4,351)
Foreign exchange adjustment	(1,041)
Promigas SA [Member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	2,118,200	1,734,733
Cost	176,125	485,455
Amortization of the year	(118,162)	(101,988)
Ending Balance	2,176,163	2,118,200
Promigas SA [Member] | Accumulated depreciation, amortisation and impairment [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	(251,731)	(149,743)
Reclassification to PPE	841	(2,111)
Amortization of the year	(119,549)	(100,850)
Ending Balance	(369,893)	(251,731)
Withdrawals / Sales	630	973
Foreign exchange adjustment	(84)
Promigas SA [Member] | Gross carrying amount [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	2,369,931	1,884,476
Additions	193,489	421,202
Reclassification to PPE	(14,408)	68,587
Ending Balance	2,546,056	2,369,931
Withdrawals / Sales	(1,915)	(4,334)
Foreign exchange adjustment	(1,041)
Concesionaria Vial de los Andes SA [Member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	291,235	343,380
Cost	81,039	96,604
Amortization of the year	(153,212)	(148,749)
Ending Balance	219,062	291,235
Concesionaria Vial de los Andes SA [Member] | Accumulated depreciation, amortisation and impairment [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	(359,406)	(210,657)
Reclassification to PPE	0	0
Amortization of the year	(153,212)	(148,749)
Ending Balance	(512,618)	(359,406)
Withdrawals / Sales	0	0
Foreign exchange adjustment	0
Concesionaria Vial de los Andes SA [Member] | Gross carrying amount [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	650,641	554,037
Additions	82,629	96,621
Reclassification to PPE	0	0
Ending Balance	731,680	650,641
Withdrawals / Sales	(1,590)	(17)
Foreign exchange adjustment	0
Proyectos de infractructura SA [Member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	245,101	243,435
Cost	29,305	11,153
Amortization of the year	(10,083)	(9,487)
Ending Balance	264,323	245,101
Proyectos de infractructura SA [Member] | Accumulated depreciation, amortisation and impairment [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	(28,458)	(18,971)
Reclassification to PPE	0	(2)
Amortization of the year	(10,083)	(9,485)
Ending Balance	(38,541)	(28,458)
Withdrawals / Sales	0	0
Foreign exchange adjustment	0
Proyectos de infractructura SA [Member] | Gross carrying amount [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	273,559	262,406
Additions	29,305	11,150
Reclassification to PPE	0	3
Ending Balance	302,864	273,559
Withdrawals / Sales	0	0
Foreign exchange adjustment	0
EPISOL S.A.S and Subsidiaries [Member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	150,778	69,154
Cost	305,486	83,207
Amortization of the year	(1,645)	(1,583)
Ending Balance	454,619	150,778
EPISOL S.A.S and Subsidiaries [Member] | Accumulated depreciation, amortisation and impairment [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	(4,820)	(3,237)
Reclassification to PPE	0	0
Amortization of the year	(1,645)	(1,583)
Ending Balance	(6,465)	(4,820)
Withdrawals / Sales	0	0
Foreign exchange adjustment	0
EPISOL S.A.S and Subsidiaries [Member] | Gross carrying amount [member] | Service concession [Member]
Disclosure of detailed information about service concession arrangements [line items]
Begining Balance	155,598	72,391
Additions	305,486	83,206
Reclassification to PPE	0	1
Ending Balance	461,084	155,598
Withdrawals / Sales	0	$ 0
Foreign exchange adjustment	$ 0

CONCESSION ARRANGEMENTS RIGH176

CONCESSION ARRANGEMENTS RIGHTS (Details 2) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated income recorded
Begining Balance	$ 3,813,095	$ 1,875,161	$ 628,470
Income from concession contracts during the period	939,534	1,145,393	597,635
Financial income during the period	209,936	180,982	216,660
Income from toll during the period	506,274	502,535	427,995
Administration, Operation and maintenance (AOM) fees during the period	68,387	37,436	4,401
Adjustment for interest during the period	46,299	71,588
Movement during the period	1,770,430	1,937,934	1,246,691
Ending Balance	5,583,525	3,813,095	1,875,161
Costs incurred in the concession
Begining Balance	2,151,514	965,930	379,855
Construction cost incurred during the period	680,381	1,145,393	547,282
Financial cost incurred during the period	47,604	40,191	38,793
Movement during the period	727,985	1,185,584	586,075
Ending Balance	2,879,499	2,151,514	965,930
Promigas SA [Member]
Accumulated income recorded
Begining Balance	1,288,299	524,299	318,699
Income from concession contracts during the period	193,185	583,018	52,507
Financial income during the period	209,936	180,982	153,093
Income from toll during the period	0	0	0
Administration, Operation and maintenance (AOM) fees during the period	0	0	0
Adjustment for interest during the period	0	0
Movement during the period	403,121	764,000	205,600
Ending Balance	1,691,420	1,288,299	524,299
Costs incurred in the concession
Begining Balance	799,466	214,050	160,772
Construction cost incurred during the period	193,185	583,018	52,507
Financial cost incurred during the period	3,308	2,398	771
Movement during the period	196,493	585,416	53,278
Ending Balance	995,959	799,466	214,050
Concesionaria Vial de los Andes SA [Member]
Accumulated income recorded
Begining Balance	1,622,858	1,004,540	229,729
Income from concession contracts during the period	217,954	334,762	480,901
Financial income during the period	0	0	63,563
Income from toll during the period	236,790	215,319	230,348
Administration, Operation and maintenance (AOM) fees during the period	0	0	0
Adjustment for interest during the period	24,439	68,237
Movement during the period	479,183	618,318	774,811
Ending Balance	2,102,041	1,622,858	1,004,540
Costs incurred in the concession
Begining Balance	1,110,561	738,006	219,083
Construction cost incurred during the period	209,055	334,762	480,901
Financial cost incurred during the period	0	37,793	38,022
Movement during the period	209,055	372,555	518,923
Ending Balance	1,319,616	1,110,561	738,006
Proyectos de infractructura SA [Member]
Accumulated income recorded
Begining Balance	502,282	211,522	0
Income from concession contracts during the period	51,939	77,466	13,874
Financial income during the period	0	0
Income from toll during the period	228,643	213,294	197,648
Administration, Operation and maintenance (AOM) fees during the period	0	0	0
Adjustment for interest during the period	0	0
Movement during the period	280,582	290,760	211,522
Ending Balance	782,864	502,282	211,522
Costs incurred in the concession
Begining Balance	91,340	13,874	0
Construction cost incurred during the period	51,939	77,466	13,874
Financial cost incurred during the period	0	0	0
Movement during the period	51,939	77,466	13,874
Ending Balance	143,279	91,340	13,874
Episol S.A.S. [Member]
Accumulated income recorded
Begining Balance	399,656	134,800	80,042
Income from concession contracts during the period	413,203	150,147	50,353
Financial income during the period	0	0	4
Income from toll during the period	40,841	73,922	0
Administration, Operation and maintenance (AOM) fees during the period	67,468	37,436	4,401
Adjustment for interest during the period	20,780	3,351
Movement during the period	542,292	264,856	54,758
Ending Balance	941,948	399,656	134,800
Costs incurred in the concession
Begining Balance	150,147	0	0
Construction cost incurred during the period	214,105	150,147	0
Financial cost incurred during the period	39,388	0	0
Movement during the period	253,493	150,147	0
Ending Balance	403,640	150,147	0
Concesionaria Nueva Via Al Mar S.A.S. [Member]
Accumulated income recorded
Begining Balance	0	0	0
Income from concession contracts during the period	104	0	0
Financial income during the period	0	0	0
Income from toll during the period	0	0	0
Administration, Operation and maintenance (AOM) fees during the period	919	0	0
Adjustment for interest during the period	1,080	0
Movement during the period	2,103	0	0
Ending Balance	2,103	0	0
Costs incurred in the concession
Begining Balance	0	0	0
Construction cost incurred during the period	104	0	0
Financial cost incurred during the period	4,908	0	0
Movement during the period	5,012	0	0
Ending Balance	5,012	0	0
Concesionaria Vial Del Pacifico S.A.S. [Member]
Accumulated income recorded
Begining Balance	0	0	0
Income from concession contracts during the period	63,149	0	0
Financial income during the period	0	0	0
Income from toll during the period	0	0	0
Administration, Operation and maintenance (AOM) fees during the period	0	0	0
Adjustment for interest during the period	0	0
Movement during the period	63,149	0	0
Ending Balance	63,149	0	0
Costs incurred in the concession
Begining Balance	0	0	0
Construction cost incurred during the period	11,993	0	0
Financial cost incurred during the period	0	0	0
Movement during the period	11,993	0	0
Ending Balance	$ 11,993	$ 0	$ 0

CONCESSION ARRANGEMENTS RIGH177

CONCESSION ARRANGEMENTS RIGHTS (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Disclosure of detailed information about service concession arrangements [line items]
Percentage of voting equity interests acquired	40.00%
Concesionaria Nueva Via Al Mar S.A.S. [Member]
Disclosure of detailed information about service concession arrangements [line items]
Percentage of voting equity interests acquired	40.00%
Concesionaria Vial Del Pacifico S.A.S. [Member]
Disclosure of detailed information about service concession arrangements [line items]
Percentage of voting equity interests acquired	40.00%
Corficolombiana S.A [Member]
Disclosure of detailed information about service concession arrangements [line items]
Increase In Financial Asset Granted At Amortized Cost	$ 396,467
Service concession arrangement [Member]
Disclosure of detailed information about service concession arrangements [line items]
Reclassification of financial assets out of measured at fair value through profit or loss into measured at amortised cost		$ 111,432

GOODWILL (Details)

GOODWILL (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[2]	Dec. 31, 2016COP ($)
Disclosure of reconciliation of changes in goodwill [line items]
Balance at the beginning of the year		$ 6,824,935			$ 7,055,975
Additions / Purchases	[1]	102,376			2,805
Foreign exchange adjustment		(26,255)			(233,845)
Balance at the end of the year		$ 6,901,056	$ 2,312.7		$ 6,824,935
[1]	Corficolombiana acquired in 2017 an additional 40 % of the Concesionaria Vial del Pacífico – Covipacífico S.A.S., located in Colombia. The business acquisition generated Goodwill of Ps. 102,376 which was included in the Financial Statements of Grupo Aval at the end of the 2017 accounting period. (this acquisition is considered non-significant)
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

GOODWILL (Details 1)

GOODWILL (Details 1) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		$ 6,901,056	$ 2,312.7		$ 6,824,935	$ 7,055,975
Leasing Bogota Panama [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		4,688,362			4,714,617
Book value of cash-generating unit		11,349,292			10,428,240
Recoverable amount of asset or cash-generating unit		17,054,833			14,362,910
Amount by which unit's recoverable amount exceeds its carrying amount		5,705,541			3,934,670
Inside Banco de Bogotá S.A. (Megabanco) [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		465,905			465,905
Book value of cash-generating unit		7,353,562			5,579,593
Recoverable amount of asset or cash-generating unit		9,483,254			9,976,659
Amount by which unit's recoverable amount exceeds its carrying amount		2,129,692			4,397,066
Promigas S.A. and Subsidiaries [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		169,687			169,687
Book value of cash-generating unit		3,653,698			2,785,270
Recoverable amount of asset or cash-generating unit		9,392,266			7,089,387
Amount by which unit's recoverable amount exceeds its carrying amount		5,738,568			4,304,116
Concesionaria Panamericana S.A.S [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		119,916			119,916
Book value of cash-generating unit		169,451			35,585
Recoverable amount of asset or cash-generating unit		261,223			370,248
Amount by which unit's recoverable amount exceeds its carrying amount		91,772			334,663
Hoteles Estelar S. A. [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		6,661			6,661
Book value of cash-generating unit		98,688			90,794
Recoverable amount of asset or cash-generating unit		179,420			97,956
Amount by which unit's recoverable amount exceeds its carrying amount		80,732			7,162
Inside Banco de Occidente S.A. (Banco Unión) [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		22,724			22,724
Book value of cash-generating unit		2,648,449			41,935
Recoverable amount of asset or cash-generating unit		2,878,178			454,906
Amount by which unit's recoverable amount exceeds its carrying amount		229,729			412,971
Banco Popular S. A. [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		358,401			358,401
Book value of cash-generating unit		2,710,218			2,624,196
Recoverable amount of asset or cash-generating unit		3,316,807			3,541,307
Amount by which unit's recoverable amount exceeds its carrying amount		606,589			917,111
Banco de Bogota S.A. [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		301,222			301,222
Book value of cash-generating unit		11,000,669			10,331,548
Recoverable amount of asset or cash-generating unit		15,361,349			13,708,171
Amount by which unit's recoverable amount exceeds its carrying amount		4,360,680			3,376,623
Banco de Occidente S.A. [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		127,571			127,571
Book value of cash-generating unit		3,174,228			3,089,717
Recoverable amount of asset or cash-generating unit		4,394,187			4,168,844
Amount by which unit's recoverable amount exceeds its carrying amount		1,219,959			1,079,127
Concesionaria Covipacifico S.A.S [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount	[2]	102,376
Book value of cash-generating unit	[2]	104,600
Recoverable amount of asset or cash-generating unit	[2]	111,026
Amount by which unit's recoverable amount exceeds its carrying amount	[2]	6,426
Sociedad Administradora de Pensiones y Cesantias Porvenir S.A [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill carrying amount		538,231			538,231
Book value of cash-generating unit		2,888,669			2,433,816
Recoverable amount of asset or cash-generating unit		9,610,514			9,187,043
Amount by which unit's recoverable amount exceeds its carrying amount		$ 6,721,845			$ 6,753,227
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Corresponds to 40% of the Consesionaria Vial del Pacífico – Covipacífico S.A.S. (this acquisition is considered as non-significant)

GOODWILL (Details 2)

GOODWILL (Details 2) - Leasing Bogota Panama [Member]	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Discount rate after taxes	11.30%
Growth rate after ten years	3.00%
2022 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	11.10%
Borrowing rate	3.00%
Growth in income from commissions	8.30%
Growth in expenses	6.80%
2017 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments		10.80%
Borrowing rate		3.00%
Growth in income from commissions		3.90%
Growth in expenses		5.80%
Discount rate after taxes		13.20%
Growth rate after ten years		3.00%
2018 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	11.00%	10.80%
Borrowing rate	2.70%	3.00%
Growth in income from commissions	6.50%	5.60%
Growth in expenses	6.10%	7.40%
Discount rate after taxes	11.30%
Growth rate after ten years	3.00%
2019 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	11.00%	10.80%
Borrowing rate	2.80%	3.00%
Growth in income from commissions	8.30%	6.60%
Growth in expenses	6.20%	7.10%
2020 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	11.00%	10.80%
Borrowing rate	2.90%	3.00%
Growth in income from commissions	8.20%	5.70%
Growth in expenses	6.70%	6.80%
2021 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	11.00%	10.90%
Borrowing rate	3.00%	3.00%
Growth in income from commissions	8.20%	6.50%
Growth in expenses	6.70%	6.20%

GOODWILL (Details 3)

GOODWILL (Details 3) - Inside Banco de Bogota S.A [Member] $ in Millions	Dec. 31, 2017COP ($)
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	100.00%
Goodwill	$ 465,905
Cash-generating units one [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	32.70%
Goodwill	$ 152,539
Cash-generating units two [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	30.80%
Goodwill	$ 143,287
Cash-generating units three [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	27.00%
Goodwill	$ 125,934
Cash-generating units four [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	6.70%
Goodwill	$ 31,304
Cash-generating units five [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of goodwill allocated	2.80%
Goodwill	$ 12,841

GOODWILL (Details 4)

GOODWILL (Details 4) - Inside Banco de Bogota S.A [Member]	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Discount rate after taxes	14.00%
Growth rate after five years	3.50%
2017 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments		10.50%
Borrowing rate		4.70%
Growth in income from commissions		17.20%
Growth in expenses		7.00%
Inflation		4.10%
Discount rate after taxes		15.70%
Growth rate after five years		3.00%
2018 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	9.60%	10.00%
Borrowing rate	3.60%	4.10%
Growth in income from commissions	9.20%	21.30%
Growth in expenses	2.50%	10.80%
Inflation	3.30%	3.00%
Discount rate after taxes	14.00%
Growth rate after five years	3.50%
2019 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	9.40%	9.60%
Borrowing rate	3.30%	3.70%
Growth in income from commissions	7.70%	12.20%
Growth in expenses	4.00%	10.80%
Inflation	3.40%	3.10%
2020 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	9.30%	9.20%
Borrowing rate	3.20%	3.20%
Growth in income from commissions	7.80%	12.20%
Growth in expenses	4.00%	11.00%
Inflation	3.20%	3.00%
2021 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	9.50%	9.00%
Borrowing rate	3.60%	3.20%
Growth in income from commissions	8.50%	15.60%
Growth in expenses	5.10%	12.70%
Inflation	3.30%	3.00%
2022 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	9.60%
Borrowing rate	3.80%
Growth in income from commissions	8.50%
Growth in expenses	4.40%
Inflation	3.60%

GOODWILL (Details 5)

GOODWILL (Details 5) - Pensiones y Cesantias Porvenir S.A. [Member]	Dec. 31, 2017	Dec. 31, 2016
2,017
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments		6.50%
Borrowing rate		6.30%
Growth in income from commissions		6.90%
Growth in expenses		3.50%
Inflation		3.70%
Discount interest rate after taxes		12.90%
Growth rate after twenty years		4.00%
2,018
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	5.80%	5.90%
Borrowing rate	6.30%	6.30%
Growth in income from commissions	14.20%	12.70%
Growth in expenses	11.20%	13.20%
Inflation	3.30%	3.00%
Discount interest rate after taxes	13.00%
Growth rate after twenty years	3.50%
2,019
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	5.90%	6.20%
Borrowing rate	6.30%	6.30%
Growth in income from commissions	8.00%	7.20%
Growth in expenses	6.70%	5.30%
Inflation	3.40%	3.10%
2,020
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	5.70%	6.20%
Borrowing rate	6.30%	6.30%
Growth in income from commissions	7.70%	7.10%
Growth in expenses	6.10%	6.50%
Inflation	3.20%	3.00%
2,021
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	5.80%	6.20%
Borrowing rate	6.30%	6.30%
Growth in income from commissions	7.60%	6.90%
Growth in expenses	6.10%	5.90%
Inflation	3.30%	3.00%
2022 [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Lending rate on the loan portfolio and investments	6.20%
Borrowing rate	6.30%
Growth in income from commissions	7.50%
Growth in expenses	6.40%
Inflation	3.60%

GOODWILL (Details Textual)

GOODWILL (Details Textual) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		40.00%
Additional recognition, goodwill	[1]	$ 102,376	$ 2,805
Banco Bilbao Vizcaya Argentaria S.A. Panama [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		98.92%
Grupo Financiero Reformador de Guatemala [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		100.00%
Banco de Credito y Desarrollo Social [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		94.99%
Consesionaria Vial del Pacifico Covipacifico S.A.S [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		40.00%
Medios de Pago MP S.A [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		100.00%
Gain (loss) that relates to identifiable assets acquired or liabilities assumed in business combination and is of such size, nature or incidence that disclosure is relevant to understanding combined entity's financial statements		$ 853,401
COINCA Corporation Inc [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Percentage of voting equity interests acquired		100.00%
Leasing Bogota Panama [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Explanation of period over which management has projected cash flows		10 years
Recoverable amount of asset or cash-generating unit		$ 17,054,833	14,362,910
Book value of cash-generating unit		$ 11,349,292	10,428,240
Growth rate used to extrapolate cash flow projections		3.00%
Discount rate applied to cash flow projections		11.30%
Incrase/decrase in discount rate applied to cash flow projections		1.00%
Value-in-use of the cash-generating units to which the goodwill was allocated		$ 14,510,903
Exceeds the Book Value Of Cash generating Unit		$ 5,705,541
Inside Banco de Bogota S.A [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Explanation of period over which management has projected cash flows		5 years
Recoverable amount of asset or cash-generating unit		$ 9,483,254	9,976,659
Book value of cash-generating unit		$ 7,353,562	5,579,593
Growth rate used to extrapolate cash flow projections		3.50%
Discount rate applied to cash flow projections		14.00%
Incrase/decrase in discount rate applied to cash flow projections		1.00%
Exceeds the Book Value Of Cash generating Unit		$ 2,129,692
Pensiones y Cesantias Porvenir S.A. [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Explanation of period over which management has projected cash flows		20 years
Recoverable amount of asset or cash-generating unit		$ 9,610,514	9,187,043
Book value of cash-generating unit		$ 2,888,669	$ 2,433,816
Growth rate used to extrapolate cash flow projections		3.50%
Discount rate applied to cash flow projections		13.00%
Incrase/decrase in discount rate applied to cash flow projections		1.00%
Value-in-use of the cash-generating units to which the goodwill was allocated		$ 8,653,365
Exceeds the Book Value Of Cash generating Unit		6,721,845
Banco de Bogota [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Value-in-use of the cash-generating units to which the goodwill was allocated		$ 8,724,594
[1]	Corficolombiana acquired in 2017 an additional 40 % of the Concesionaria Vial del Pacífico – Covipacífico S.A.S., located in Colombia. The business acquisition generated Goodwill of Ps. 102,376 which was included in the Financial Statements of Grupo Aval at the end of the 2017 accounting period. (this acquisition is considered non-significant)

OTHER INTANGIBLE ASSETS (Detail

OTHER INTANGIBLE ASSETS (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	$ 848,681	$ 735,043
Cost [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	1,289,253	1,053,851
Accumulated amortization [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	(440,572)	(318,808)
Software and information technology applications purchased [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	552,443	440,568
Software and information technology applications purchased [member] | Cost [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	845,402	649,053
Software and information technology applications purchased [member] | Accumulated amortization [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	(292,959)	(208,485)
Other intangibles assets [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	42,510	54,565
Other intangibles assets [member] | Cost [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	52,125	66,592
Other intangibles assets [member] | Accumulated amortization [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	(9,615)	(12,027)
Licences [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	253,728	239,910
Licences [member] | Cost [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	391,726	338,206
Licences [member] | Accumulated amortization [member]
Discloser Of Other Intagible Assets [Line Items]
Intangible assets other than goodwill	$ (137,998)	$ (98,296)

INCOME TAX (Details)

INCOME TAX (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[2]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of income tax [Abstract]
Current period income tax		$ 1,276,458			$ 1,264,066	$ 1,190,949
Income tax surcharge		151,980			0	0
CREE tax		0			295,324	356,475
CREE surcharge		0			193,425	200,965
Subtotal current period taxes		1,428,438			1,752,815	1,748,389
Prior years adjustments	[1]	(117,568)			(13,440)	(19,282)
Adjustment due to uncertain tax positions in prior years		(7,367)			(31,067)	3,542
Deferred taxes		449,291			348,601	146,321
Total		$ 1,752,794	$ 587.4		2,056,909	1,878,970
Income tax recovery					$ 109,632	$ 109,632	$ 109,632
[1]	Includes a Ps. 109,632 tax recovery at Banco de Bogotá for the years 2014, 2015 and 2016
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INCOME TAX (Details 1)

INCOME TAX (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of income tax [Abstract]
Profit before income tax	$ 4,915,227			$ 5,573,845	$ 5,224,656
Enacted tax rate in Colombia	40.00%	40.00%		40.00%	39.00%
Theoretical income tax expense	$ 1,966,091			$ 2,229,538	$ 2,037,616
Non deductible expenses	387,933			339,803	298,773
Tax losses considered non recoverable for income tax purpose	96,266			140,904	0
Presumptive income considered non recoverable for income tax purpose	7,991			45,385	28,954
Wealth tax	40,762			107,051	118,245
Nontaxable dividends	(19,587)			(15,655)	(47,883)
Nontaxable income under equity method in associates	(68,026)			(56,306)	(91,572)
Profit (loss) in sales or appraisal of investment	(16,584)			(71,669)	(7,697)
Nontaxable interest income and other income	(137,312)			(150,714)	(61,561)
Other nontaxable income	(155,010)			(83,742)	(75,171)
Revenues taxable by different tax rate	(658)			(14,983)	(5,602)
Difference from expenses deductibles at different tax rate	(11,822)			(4,679)	6,971
Tax benefits in the acquisition of property and equipment	(20,585)			(66,245)	(67,574)
Profits (losses) in Subsidiaries in tax free countries or with different tax rate	(200,661)			(143,109)	(66,729)
Effect on the deferred income tax due to changes in tax rates	(38,574)			(96,232)	(71,962)
Expenses considered non recoverable for deferred income tax purposes	0			1,465	11,598
Prior year adjustments	(117,568)			(13,440)	(44,581)
Adjustments due to uncertain tax positions in previous year	(7,367)			(31,067)	28,374
Other	47,505			(59,396)	(111,229)
Total tax expense of the year	$ 1,752,794	$ 587.4	[1]	$ 2,056,909	$ 1,878,970
Effective income tax rate	35.66%	35.66%		36.90%	35.96%
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INCOME TAX (Details 2)

INCOME TAX (Details 2) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of income tax [Line Items]
Deferred tax assets	$ 139,423	$ 46.7		$ 194,962
Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	654,057			397,869
Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	268,153			235,969
Excess of presumptive income excess of Unused Tax Losses [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	922,210			633,838
Not later than one year [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	0			5,041
Later than one year and not later than two years [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	43,668			43,307
Later than two years and not later than three years [member] | Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	4,732			0
Later than two years and not later than three years [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	64,590			83,871
Without expiration date [Member] | Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	484,376			397,869
Later than three years and not later than four years [member] | Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	1,758			0
Later than three years and not later than four years [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	48,170			54,150
Later than four years and not later than five years [member] | Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	3,107			0
Later than four years and not later than five years [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	64,998			49,600
Later than five years [member] | Unused tax loss carry forwards [member]
Disclosure of income tax [Line Items]
Deferred tax assets	160,084			0
Later than five years [member] | Excess of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax assets	$ 46,727			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INCOME TAX (Details 3)

INCOME TAX (Details 3) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	$ (1,051,847)	$ (301,971)	$ (1,005,680)
Deferred tax expense (income) recognised in profit or loss	(449,291)	(348,601)	(146,321)
Income tax relating to components of other comprehensive income	(60,960)	(396,125)	878,987
Deferred tax relating to items credited (charged) directly to equity	4,678	(5,150)	(28,957)
Deferred tax liability (asset)	(1,557,420)	(1,051,847)	(301,971)
Deferred tax assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	1,637,801	2,271,478	1,363,698
Deferred tax expense (income) recognised in profit or loss	(123,089)	(236,997)	68,921
Income tax relating to components of other comprehensive income	624	(335,925)	878,987
Deferred tax relating to items credited (charged) directly to equity	5,451	(60,755)	(40,128)
Deferred tax liability (asset)	1,520,787	1,637,801	2,271,478
Deferred tax assets [Member] | Debt securities at fair value [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	62,627	290,465	17,317
Deferred tax expense (income) recognised in profit or loss	(30,580)	(5,459)	240,415
Income tax relating to components of other comprehensive income	(23,966)	(212,090)	263,532
Deferred tax relating to items credited (charged) directly to equity	0	(10,289)	(230,799)
Deferred tax liability (asset)	8,081	62,627	290,465
Deferred tax assets [Member] | Equity securities at fair value [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	1,583	323	7,505
Deferred tax expense (income) recognised in profit or loss	(1,254)	(26,416)	(1,082)
Income tax relating to components of other comprehensive income	(321)	27,676	0
Deferred tax relating to items credited (charged) directly to equity	0	0	(6,100)
Deferred tax liability (asset)	8	1,583	323
Deferred tax assets [Member] | Derivative instruments [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	78,740	518,992	555,521
Deferred tax expense (income) recognised in profit or loss	(41,935)	(223,831)	(159,875)
Income tax relating to components of other comprehensive income	0	(165,894)	(19,044)
Deferred tax relating to items credited (charged) directly to equity	0	(50,527)	142,390
Deferred tax liability (asset)	36,805	78,740	518,992
Deferred tax assets [Member] | Accounts receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	16,278	7,852	0
Deferred tax expense (income) recognised in profit or loss	(15,589)	8,426	7,852
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	10	0	0
Deferred tax liability (asset)	699	16,278	7,852
Deferred tax assets [Member] | Differences between the accounting and tax bases of loans and receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	6,014	5,652	30,998
Deferred tax expense (income) recognised in profit or loss	65,924	362	(26,337)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	991
Deferred tax liability (asset)	71,938	6,014	5,652
Deferred tax assets [Member] | Allowance for impairment on loans and receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	105,573	96,054	102,662
Deferred tax expense (income) recognised in profit or loss	(39,446)	9,679	12,503
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	(160)	(19,111)
Deferred tax liability (asset)	66,127	105,573	96,054
Deferred tax assets [Member] | Allowance for other accounts receivable [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	6,219	18,119	1,897
Deferred tax expense (income) recognised in profit or loss	(1,570)	(11,900)	(1,730)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	17,952
Deferred tax liability (asset)	4,649	6,219	18,119
Deferred tax assets [Member] | Financial assets in concession contracts [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	25,837	12,096	11,341
Deferred tax expense (income) recognised in profit or loss	2,571	13,741	588
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	128	0	167
Deferred tax liability (asset)	28,536	25,837	12,096
Deferred tax assets [Member] | Differences between accounting and tax basis of foreclosed assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	4,846	13,326	30,180
Deferred tax expense (income) recognised in profit or loss	13,315	(8,480)	(16,854)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	18,161	4,846	13,326
Deferred tax assets [Member] | Differences between accounting and tax basis of the cost in property, plant and equipment [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	296,269	58,505	39,561
Deferred tax expense (income) recognised in profit or loss	68,271	237,739	21,074
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	25	(2,130)
Deferred tax liability (asset)	364,540	296,269	58,505
Deferred tax assets [Member] | Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	5,699	5,415	6,938
Deferred tax expense (income) recognised in profit or loss	6,294	284	(1,526)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	3
Deferred tax liability (asset)	11,993	5,699	5,415
Deferred tax assets [Member] | Biological asset [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	101	369	4,580
Deferred tax expense (income) recognised in profit or loss	68	(268)	(4,211)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	169	101	369
Deferred tax assets [Member] | Differences between accounting and tax basis of deferred charges and of intangible assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	113,817	77,055	59,354
Deferred tax expense (income) recognised in profit or loss	30,922	37,167	17,701
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	886	(405)	0
Deferred tax liability (asset)	145,625	113,817	77,055
Deferred tax assets [Member] | Tax losses carry forward [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	385,855	527,153	45,601
Deferred tax expense (income) recognised in profit or loss	(53,556)	(140,623)	3,020
Income tax relating to components of other comprehensive income	0	0	478,532
Deferred tax relating to items credited (charged) directly to equity	55	(675)	0
Deferred tax liability (asset)	332,354	385,855	527,153
Deferred tax assets [Member] | Surplus of presumptive income [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	19,480	166,116	16,147
Deferred tax expense (income) recognised in profit or loss	(16,952)	(146,636)	(13,249)
Income tax relating to components of other comprehensive income	0	0	163,218
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	2,528	19,480	166,116
Deferred tax assets [Member] | Provisions [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	212,695	146,578	126,762
Deferred tax expense (income) recognised in profit or loss	(17,649)	60,716	23,070
Income tax relating to components of other comprehensive income	0	5,706	0
Deferred tax relating to items credited (charged) directly to equity	2,917	(305)	(3,254)
Deferred tax liability (asset)	197,963	212,695	146,578
Deferred tax assets [Member] | Employee benefits [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	104,606	101,224	104,872
Deferred tax expense (income) recognised in profit or loss	(29,658)	(5,718)	3,927
Income tax relating to components of other comprehensive income	23,976	8,677	(7,251)
Deferred tax relating to items credited (charged) directly to equity	0	423	(324)
Deferred tax liability (asset)	98,924	104,606	101,224
Deferred tax assets [Member] | Goodwill [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	0	6,947	6,947
Deferred tax expense (income) recognised in profit or loss		(6,947)	0
Income tax relating to components of other comprehensive income		0	0
Deferred tax relating to items credited (charged) directly to equity		0	0
Deferred tax liability (asset)		0	6,947
Deferred tax assets [Member] | Deferred income [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	113,380	35,857	8,092
Deferred tax expense (income) recognised in profit or loss	(113,380)	77,523	30,574
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	(2,809)
Deferred tax liability (asset)	0	113,380	35,857
Deferred tax assets [Member] | Lease agreement [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	9,160	8,414	7,315
Deferred tax expense (income) recognised in profit or loss	(1,118)	746	1,099
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	8,042	9,160	8,414
Deferred tax assets [Member] | Other [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	69,022	174,966	180,108
Deferred tax expense (income) recognised in profit or loss	52,233	(107,102)	(68,038)
Income tax relating to components of other comprehensive income	935	0	0
Deferred tax relating to items credited (charged) directly to equity	1,455	1,158	62,896
Deferred tax liability (asset)	123,645	69,022	174,966
Deferred tax liabilities [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(2,689,648)	(2,573,449)	(2,369,378)
Deferred tax expense (income) recognised in profit or loss	(326,202)	(111,604)	(215,242)
Income tax relating to components of other comprehensive income	(61,584)	(60,200)	0
Deferred tax relating to items credited (charged) directly to equity	(773)	55,605	11,171
Deferred tax liability (asset)	(3,078,207)	(2,689,648)	(2,573,449)
Deferred tax liabilities [Member] | Debt securities at fair value [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(27,278)	(19,943)	9,509
Deferred tax expense (income) recognised in profit or loss	29,105	44,338	(243,790)
Income tax relating to components of other comprehensive income	(46,319)	(51,673)	0
Deferred tax relating to items credited (charged) directly to equity	0	0	214,338
Deferred tax liability (asset)	(44,492)	(27,278)	(19,943)
Deferred tax liabilities [Member] | Equity securities at fair value [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(100,484)	(104,317)	(103,469)
Deferred tax expense (income) recognised in profit or loss	302	(9,072)	103
Income tax relating to components of other comprehensive income	33	13,059	0
Deferred tax relating to items credited (charged) directly to equity	952	(154)	(951)
Deferred tax liability (asset)	(121,226)	(100,484)	(104,317)
Deferred tax liabilities [Member] | Derivative instruments [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(67,974)	(333,317)	(346,677)
Deferred tax expense (income) recognised in profit or loss	(15,190)	240,468	149,307
Income tax relating to components of other comprehensive income	(4,361)	(21,586)	0
Deferred tax relating to items credited (charged) directly to equity	0	46,461	(135,947)
Deferred tax liability (asset)	(87,525)	(67,974)	(333,317)
Deferred tax liabilities [Member] | Accounts receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(260,621)	0
Deferred tax expense (income) recognised in profit or loss	(46,335)	(260,621)
Income tax relating to components of other comprehensive income	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0
Deferred tax liability (asset)	(306,956)	(260,621)	0
Deferred tax liabilities [Member] | Differences between the accounting and tax bases of loans and receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(268,747)	(238,492)	(77,205)
Deferred tax expense (income) recognised in profit or loss	(53,999)	(30,255)	(27,030)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	(134,257)
Deferred tax liability (asset)	(322,746)	(268,747)	(238,492)
Deferred tax liabilities [Member] | Allowance for impairment on loans and receivables [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(275,785)	(227,336)	(366,953)
Deferred tax expense (income) recognised in profit or loss	(122,053)	(48,449)	5,457
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	134,160
Deferred tax liability (asset)	(397,838)	(275,785)	(227,336)
Deferred tax liabilities [Member] | Financial assets in concession contracts [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(718,496)	(627,666)
Deferred tax expense (income) recognised in profit or loss	20,548	(90,830)
Income tax relating to components of other comprehensive income	0	0
Deferred tax relating to items credited (charged) directly to equity	(2,790)	0
Deferred tax liability (asset)	(700,738)	(718,496)	(627,666)
Deferred tax liabilities [Member] | Differences between accounting and tax basis of foreclosed assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(46,783)	(83,774)	(60,587)
Deferred tax expense (income) recognised in profit or loss	(25,426)	36,991	(44,414)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	21,227
Deferred tax liability (asset)	(72,209)	(46,783)	(83,774)
Deferred tax liabilities [Member] | Differences between accounting and tax basis of the cost in property, plant and equipment [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(400,180)	(355,478)	(453,088)
Deferred tax expense (income) recognised in profit or loss	36,404	(44,865)	98,866
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	(38)	163	(1,256)
Deferred tax liability (asset)	(363,814)	(400,180)	(355,478)
Deferred tax liabilities [Member] | Differences between accounting and tax basis of accumulated of depreciation of property, plant and equipment [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(209,549)	(227,591)	(207,123)
Deferred tax expense (income) recognised in profit or loss	30,948	18,114	(23,775)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	(1,276)	(72)	3,307
Deferred tax liability (asset)	(179,877)	(209,549)	(227,591)
Deferred tax liabilities [Member] | Biological asset [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(6,806)	(17,578)	(10,098)
Deferred tax expense (income) recognised in profit or loss	(9,777)	3,320	(7,480)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	7,452	0
Deferred tax liability (asset)	(16,583)	(6,806)	(17,578)
Deferred tax liabilities [Member] | Differences between accounting and tax basis of deferred charges and of intangible assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(60,598)	(60,003)	(33,639)
Deferred tax expense (income) recognised in profit or loss	(47,123)	(595)	(26,364)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	(107,721)	(60,598)	(60,003)
Deferred tax liabilities [Member] | Provisions [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(471)	(1,961)	(24,468)
Deferred tax expense (income) recognised in profit or loss	(62)	1,490	18,448
Income tax relating to components of other comprehensive income	116	0	0
Deferred tax relating to items credited (charged) directly to equity	(158)	0	4,059
Deferred tax liability (asset)	(575)	(471)	(1,961)
Deferred tax liabilities [Member] | Goodwill [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(86,036)	(42,822)	(23,166)
Deferred tax expense (income) recognised in profit or loss	(83,639)	(43,214)	(19,656)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	0
Deferred tax liability (asset)	(169,675)	(86,036)	(42,822)
Deferred tax liabilities [Member] | Deferred income [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(34,613)	(26,940)
Deferred tax expense (income) recognised in profit or loss	(5,921)	(7,673)
Income tax relating to components of other comprehensive income	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0
Deferred tax liability (asset)	(40,534)	(34,613)	(26,940)
Deferred tax liabilities [Member] | Other [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(65,400)	(152,823)	(137,604)
Deferred tax expense (income) recognised in profit or loss	(30,128)	85,669	81,121
Income tax relating to components of other comprehensive income	(11,053)	0	0
Deferred tax relating to items credited (charged) directly to equity	2,537	1,755	(96,340)
Deferred tax liability (asset)	(104,044)	(65,400)	(152,823)
Deferred tax liabilities [Member] | Provision for foreclosed assets [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	(37,798)	(15,198)	(10,070)
Deferred tax expense (income) recognised in profit or loss	(3,856)	(22,600)	(5,151)
Income tax relating to components of other comprehensive income	0	0	0
Deferred tax relating to items credited (charged) directly to equity	0	0	23
Deferred tax liability (asset)	(41,654)	(37,798)	(15,198)
Deferred tax liabilities [Member] | Unrealized profits of foreign subsidiaries [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)	$ (22,029)	(38,209)	(17,974)
Deferred tax expense (income) recognised in profit or loss		16,180	(20,235)
Income tax relating to components of other comprehensive income		0	0
Deferred tax relating to items credited (charged) directly to equity		0	0
Deferred tax liability (asset)		(22,029)	(38,209)
Deferred tax liabilities [Member] | Accumulative translation adjustment in foreign operations [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)		(26,940)	(22,661)
Deferred tax expense (income) recognised in profit or loss			(7,088)
Income tax relating to components of other comprehensive income			0
Deferred tax relating to items credited (charged) directly to equity			2,809
Deferred tax liability (asset)			(26,940)
Deferred tax liabilities [Member] | Financial and intangible assets in concession contracts [Member]
Disclosure of income tax [Line Items]
Deferred tax liability (asset)		$ (627,666)	(484,105)
Deferred tax expense (income) recognised in profit or loss			(143,561)
Income tax relating to components of other comprehensive income			0
Deferred tax relating to items credited (charged) directly to equity			0
Deferred tax liability (asset)			$ (627,666)

INCOME TAX (Details 4)

INCOME TAX (Details 4) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Disclosure of income tax [Line Items]
Deferred tax asset	$ 139,423	$ 46.7		$ 194,962
Deferred tax liability	(1,696,843)	$ (568.6)		(1,246,809)
Net	(1,557,420)			(1,051,847)	$ (301,971)	$ (1,005,680)
Gross Amount [Member]
Disclosure of income tax [Line Items]
Deferred tax asset	1,520,787			1,637,801
Deferred tax liability	(3,078,207)			(2,689,648)
Net	(1,557,420)			(1,051,847)
Reclassification [Member]
Disclosure of income tax [Line Items]
Deferred tax asset	(1,381,364)			(1,442,839)
Deferred tax liability	1,381,364			1,442,839
Net	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INCOME TAX (Details 5)

INCOME TAX (Details 5) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of income tax [Line Items]
Amount before tax	$ 148,987			$ 666,563	$ (920,055)
Current tax expense (income)	(12,657)			31,769	319,627
Deferred tax expense (income)	(60,960)			(396,125)	878,987
Total other comprehensive income	37,249	$ 25.2		302,207	278,559
Foreign currency translation of net investments in foreign operations [Member]
Disclosure of income tax [Line Items]
Amount before tax	(91,497)			(125,161)	24,878
Current tax expense (income)	(12,657)			8,204	0
Deferred tax expense (income)	956			0	0
Total other comprehensive income	(103,198)			(116,957)	24,878
Cash Flow hedgings [Member]
Disclosure of income tax [Line Items]
Amount before tax	(2,340)			17,967	17,500
Current tax expense (income)	0			0	0
Deferred tax expense (income)	969			0	(6,825)
Total other comprehensive income	(1,371)			17,967	10,675
Equity financial instruments [Member]
Disclosure of income tax [Line Items]
Amount before tax	57,245			34,509	(6,548)
Current tax expense (income)	0			0	0
Deferred tax expense (income)	(720)			40,735	0
Total other comprehensive income	56,525			75,244	(6,548)
Debt financial instruments [Member]
Disclosure of income tax [Line Items]
Amount before tax	284,480			948,212	(922,083)
Current tax expense (income)	0			0	0
Deferred tax expense (income)	(69,743)			(263,763)	263,532
Total other comprehensive income	214,737			684,449	(658,551)
Actuarial gains losses from defined benefit pension plans [Member]
Disclosure of income tax [Line Items]
Amount before tax	(100,232)			(41,228)	6,162
Current tax expense (income)	0			0	0
Deferred tax expense (income)	24,081			14,383	(7,251)
Total other comprehensive income	(76,151)			(26,845)	(1,089)
Hedging Of net investments In foreign subsidiaries operations [Member]
Disclosure of income tax [Line Items]
Amount before tax	(47,197)			(475,000)	2,366,849
Current tax expense (income)	0			0	(37,861)
Deferred tax expense (income)	0			0	0
Total other comprehensive income	(47,197)			(475,000)	2,328,988
Hedging derivatives in foreign currency [Member]
Disclosure of income tax [Line Items]
Amount before tax	16,832			291,506	(1,683,346)
Current tax expense (income)	0			47,419	89,960
Deferred tax expense (income)	(5,554)			(187,480)	629,531
Total other comprehensive income	11,278			151,445	(963,855)
Hedging financial liabilities in foreign currency [Member]
Disclosure of income tax [Line Items]
Amount before tax	30,568			35,819	(755,431)
Current tax expense (income)	0			(23,854)	267,528
Deferred tax expense (income)	(11,065)			0	0
Total other comprehensive income	19,503			11,965	(487,903)
Investment in associates and joint ventures [Member]
Disclosure of income tax [Line Items]
Amount before tax	1,128			(20,061)	31,964
Current tax expense (income)	0			0	0
Deferred tax expense (income)	116			0	0
Total other comprehensive income	$ 1,244			$ (20,061)	$ 31,964
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

INCOME TAX (Details 6)

INCOME TAX (Details 6) - Tax contingent liability [member] - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	$ 94,692	$ 104,156	$ 145,968	$ 114,627
Bogota [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	86,592	66,428
Occidente [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	7,657	31,463
Popular [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	443	338
Villas [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	$ 0	$ 5,927

INCOME TAX (Details 7)

INCOME TAX (Details 7) - Tax contingent liability [member] - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income tax [Line Items]
Balance at the beginning of the year	$ 104,156	$ 145,968	$ 114,627
Provisions increase during the period	18,039	31,039	30,191
Provisions used	(873)	(1,867)	(1,145)
Amounts reversed due to provisions not used	(32,010)	(73,084)	(25,259)
Financial cost	7,477	12,098	7,541
Foreign exchange adjustments	(2,097)	(9,998)	20,013
Balance at the end of the year	$ 94,692	$ 104,156	$ 145,968

INCOME TAX (Details 8)

INCOME TAX (Details 8) - Tax contingent liability [member] - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	$ 94,692	$ 104,156	$ 145,968	$ 114,627
Expiry Year Two [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	0	10,027
Expiry Year Three [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	3,484	11,057
Expiry Year Four [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	3,109	13,670
Expiry Year Five [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	21,579	23,926
Expiry Year Six [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	23,902	24,413
Expiry Year Seven [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	23,034	19,681
Expiry Year Eight [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	18,250	1,382
Expiry Year Nine [Member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	$ 1,334	$ 0

INCOME TAX (Details Textual)

INCOME TAX (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of income tax [Line Items]
Applicable tax rate	40.00%	40.00%	39.00%
Amount of income exceeding which surcharge is applicable	$ 800
Unaccounted deferred tax liabilities	$ 6,613,585	$ 6,109,113
CREE tax rate	9.00%	6.00%	5.00%
Income tax recovery		$ 109,632	$ 109,632	$ 109,632
Tax contingent liability [member]
Disclosure of income tax [Line Items]
Estimated financial effect of contingent liabilities	$ 94,692	$ 104,156	$ 145,968	$ 114,627
Subsidiaries [Member] | Bogota Panama [Member]
Disclosure of income tax [Line Items]
Applicable tax rate		0.00%
Subsidiaries [Member] | Guatemala [Member]
Disclosure of income tax [Line Items]
Applicable tax rate		25.00%
Subsidiaries [Member] | Panama [Member]
Disclosure of income tax [Line Items]
Applicable tax rate		30.00%
Subsidiaries [Member] | El Salvador,Honduras, Costa Rica, and Mexico [Member]
Disclosure of income tax [Line Items]
Applicable tax rate		25.00%
Equity attributable to owners of parent [member]
Disclosure of income tax [Line Items]
Description of amounts of potential income tax consequences practicably determinable	The taxable income for income tax may not be less than 3.5% of each of our tax-declaring companies’ net equity at the end of the preceding year. When the taxable income is less than that this percentage, the difference, known as@Rup@#8220;presumptive income”, can be offset by taxable income over the following five years.
Fiscal Equity [Member]
Disclosure of income tax [Line Items]
Description of amounts of potential income tax consequences practicably determinable	The taxable income of the companies may not be lower than 3% of fiscal equity at the end of the preceding year; and if the taxable income is lower than that base, the difference may be deducted from taxable income within five years of its occurrence, as@Rup@#8220;excess of presumptive income”.
Income tax [Member]
Disclosure of income tax [Line Items]
Applicable tax rate	34.00%
CREE [Member]
Disclosure of income tax [Line Items]
Applicable tax rate	6.00%
Surcharge [Member]
Disclosure of income tax [Line Items]
Applicable tax rate	4.00%
Capital gain Tax [Member]
Disclosure of income tax [Line Items]
Applicable tax rate	10.00%

CUSTOMER DEPOSITS (Details)

CUSTOMER DEPOSITS (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of Customer Deposits [Line Items]
Balances on current accounts from customers	$ 55,778,677	$ 18,692.6		$ 50,573,924
Balances On Savings Accounts From Customers	55,778,677			50,573,924
Balances on other deposits from customers	472,782	158.4		328,798
Balances on demand deposits from customers	36,017,602	12,070.2		34,978,189
Balances on term deposits from customers	62,616,163	20,984		58,006,144
Deposits from customers	154,885,224	$ 51,905.2		143,887,055
Local currency [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	96,797,225			90,834,599
Foreign currency [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	58,083,025			53,014,364
Other currency [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	$ 4,974			$ 39,092
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

CUSTOMER DEPOSITS (Details 1)

CUSTOMER DEPOSITS (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	$ 62,616,163	$ 20,984		$ 58,006,144
Less than a year [member]
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	44,746,591
2,019
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	8,672,896
2,020
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	2,872,870
4
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	1,418,289
After 2,021
Disclosure of Customer Deposits [Line Items]
Balances on term deposits from customers	$ 4,905,517
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

CUSTOMER DEPOSITS (Details 2)

CUSTOMER DEPOSITS (Details 2)	Dec. 31, 2017	Dec. 31, 2016
Local currency [Member] | Bottom of range [member] | Checking accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.06%	0.53%
Local currency [Member] | Bottom of range [member] | Savings accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.01%	0.01%
Local currency [Member] | Bottom of range [member] | Fixed term deposit certificates [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.05%	0.05%
Local currency [Member] | Top of range [member] | Checking accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	5.77%	8.54%
Local currency [Member] | Top of range [member] | Savings accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	8.55%	8.75%
Local currency [Member] | Top of range [member] | Fixed term deposit certificates [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	9.72%	12.64%
Foreign currency [Member] | Bottom of range [member] | Checking accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.15%	0.10%
Foreign currency [Member] | Bottom of range [member] | Savings accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.05%	0.05%
Foreign currency [Member] | Bottom of range [member] | Fixed term deposit certificates [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	0.01%	0.05%
Foreign currency [Member] | Top of range [member] | Checking accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	1.50%	4.08%
Foreign currency [Member] | Top of range [member] | Savings accounts [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	8.00%	4.08%
Foreign currency [Member] | Top of range [member] | Fixed term deposit certificates [Member]
Disclosure of Customer Deposits [Line Items]
Borrowings, interest rate	10.43%	13.04%

CUSTOMER DEPOSITS (Details 3)

CUSTOMER DEPOSITS (Details 3) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 154,885,224	$ 51,905.2	[1]	$ 143,887,055
Concentrations of Deposits Percentage		100.00%	100.00%		100.00%
Individuals [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 23,362,871			$ 36,983,897
Concentrations of Deposits Percentage		15.00%	15.00%		26.00%
Commerce [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 29,587,825			$ 20,717,015
Concentrations of Deposits Percentage		19.00%	19.00%		14.00%
Government and Colombian Government Entities [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 17,443,318			$ 14,879,219
Concentrations of Deposits Percentage		11.00%	11.00%		10.00%
Manufacturing [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 9,016,500			$ 7,902,332
Concentrations of Deposits Percentage		6.00%	6.00%		5.00%
Real Estates [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 6,197,620			$ 7,078,922
Concentrations of Deposits Percentage		4.00%	4.00%		5.00%
Colombian Municipalities [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 2,290,683			$ 3,289,615
Concentrations of Deposits Percentage		1.00%	1.00%		2.00%
Agriculture and livestock [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 2,401,684			$ 3,241,177
Concentrations of Deposits Percentage		2.00%	2.00%		2.00%
Foreign Governments [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 799,687			$ 1,048,947
Concentrations of Deposits Percentage		1.00%	1.00%		1.00%
Other [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	[2]	$ 38,482,412			$ 29,154,408
Concentrations of Deposits Percentage	[2]	25.00%	25.00%		21.00%
Financial [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers		$ 25,302,624			$ 19,591,523
Concentrations of Deposits Percentage		16.00%	16.00%		14.00%
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	December 31, 2017, includes deposits from, education entities of Ps. 1,189,343, services sector of Ps. 10,201,383, science and technology Ps. 1,884,123, hydrocarbons Ps. 3,113,098, transport Ps. 1,990,271 and others in the sector Ps. 20,104,194.

CUSTOMER DEPOSITS (Details Text

CUSTOMER DEPOSITS (Details Textual) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of Customer Deposits [Line Items]
Deposits from customers	$ 154,885,224	$ 51,905.2		$ 143,887,055
Education entities [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	1,189,343
services sector [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	10,201,383
science and technology [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	1,884,123
hydrocarbons [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	3,113,098
transport [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	1,990,271
others in the sector [Member]
Disclosure of Customer Deposits [Line Items]
Deposits from customers	$ 20,104,194
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

FINANCIAL OBLIGATIONS (Details)

FINANCIAL OBLIGATIONS (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Local Currency [member]
Interbank funds
Overnight funds	$ 1,464	$ 2,075
Interbank funds purchased	336,431	1,366,757
Commitments to transfer open and closed repo operations	715,364	1,259,676
Commitments to transfer simultaneous operations	2,272,496	2,436,838
Commitments originated in short positions simultaneous operations	176,048	538,016
Total interbank funds	3,501,803	5,603,362
Borrowings	2,831,100	2,084,988
Letters of credit	485	3,509
Bankers Acceptances	17	517
Total loans banks	2,831,602	2,089,014
Foreign currency [member]
Interbank funds
Overnight funds	217	3,498
Interbank funds purchased	1,135,110	309,924
Commitments to transfer open and closed repo operations	333,300	398,933
Total interbank funds	1,468,627	712,355
Borrowings	14,529,524	15,086,112
Letters of credit	195,988	6,976
Bankers Acceptances	648,206	724,531
Total loans banks	15,373,718	15,817,619
Total financial obligations	$ 23,175,750	$ 24,222,350

FINANCIAL OBLIGATIONS (Details

FINANCIAL OBLIGATIONS (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Detailed Information About Other Borrowings Explanatory [Line Items]
Other Borrowings	$ 2,998,090	$ 1,004.7		$ 2,725,695
Banco de Comercio Exterior - “BANCOLDEX”
Disclosure Of Detailed Information About Other Borrowings Explanatory [Line Items]
Borrowings, interest rate basis	Fixed between 0.07% and %13.20%, DTF + 0.01 to 14.43%, IBR + 0.01 to 14.43, LIBOR6 + 0.01 to 4.46, LIBOR12 +0.01
Other Borrowings	$ 835,667			736,721
Fondo para el Financiamiento del Sector Agropecuario - “FINAGRO”
Disclosure Of Detailed Information About Other Borrowings Explanatory [Line Items]
Borrowings, interest rate basis	Fixed between 5.22% and 6.30%, DTF + 0.01 to 7.74%, IBR and IPC + 2.0 and 7.74%,
Other Borrowings	$ 342,728			337,649
Financiera de Desarrollo Territorial “FINDETER”
Disclosure Of Detailed Information About Other Borrowings Explanatory [Line Items]
Borrowings, interest rate basis	Fixed 0.03% and 9.77%, DTF + 0.01 to 8.48, IBR+ 0.30 to 8.48, IPC+ 0.01 and 0.05%, LIBOR3 0.04 and LIBOR6 +0.04%
Other Borrowings	$ 1,819,695			$ 1,651,325
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

FINANCIAL OBLIGATIONS (Detai203

FINANCIAL OBLIGATIONS (Details 2) $ in Millions	Dec. 31, 2017COP ($)
Disclosure of Detailed Information about Financial Obligation [Abstract]
2,018	$ 207,509
2,019	197,193
2,020	400,848
2,021	353,270
After 2,021	1,839,270
Total	$ 2,998,090

FINANCIAL OBLIGATIONS (Detai204

FINANCIAL OBLIGATIONS (Details 3) $ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		$ 19,102,196	$ 6,401.5		$ 18,568,236
Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		8,447,168			7,741,329
Foreign currency [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		10,655,028			10,826,907
BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		$ 1,195,454			1,177,271
Banco de Bogota S.A. [Member] | Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		23/02/2010
Bonds issued		$ 132,989			248,234
Maturity Date		23/02/2020
Interest Rate		CPI + 5.45% UVR + 5.45%
Banco de Occidente S.A. [Member] | Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		Between 25/08/2008 and 14/12/2017
Bonds issued		$ 3,271,929			2,811,593
Maturity Date		Between 16/07/2018 and 14/12/2032
Interest Rate		CPI + 2.90% to 7.00% Fixed between 6.18% and 7.85%
Corporacion Financiera Colombiana S.A. [Member] | Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		Between 20/05/2009 and 08/09/2016
Bonds issued		$ 2,361,702			2,356,272
Maturity Date		Between 11/03/2019 and 08/09/2036
Interest Rate		CPI + 4.00% to 6.9%
Banco Popular S. A. [Member] | Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		Between 26/02/2013 and 12/09/2017
Bonds issued		$ 1,571,308			1,620,504
Maturity Date		Between 17/02/2018 and 12/10//2026
Interest Rate		CPI + 2.44% to 4.13% IBR +1.32%; DTF + 1.49%: Fixed between 6.62% and 8.10%
Grupo Aval Acciones y Valores [Member] | Peso denominated [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		03/12/2009 and 28/06/2017
Bonds issued		$ 1,109,240			704,726
Maturity Date		Between 03/12/2019 and 28/06/2042
Interest Rate		CPI + 2.69% to 5.20%
Banco de Bogota S.A. Bajo regla144A. [Member] | Foreign currency [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		Between 19/02/2013 and 03/08 /2017
Bonds issued		$ 6,459,452			6,656,720
Maturity Date		Between 19/02/2023 and 03/08/2027
Interest Rate		Fixed between 4.38% and 6.25%
El Salvador [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date		Between 11/02/2013 and 28/11/2017
Bonds issued		$ 635,536			552,861
Maturity Date		Between 27/01/2018 and 25/05/2022
Interest Rate		Between 5.20% and 5.80%
Guatemala [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date	Between 15/02/2016 and 20/12/2017
Bonds issued		$ 400,244			543,441
Maturity Date		Between 04/01/2018 and 25/02/2019
Interest Rate	Between 4.50% and 8.50%
Honduras [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date	Between 23/07/2013 and 06/12/2017
Bonds issued		$ 159,674			68,929
Maturity Date		Between 26/03/2018 and 06/12/2020
Interest Rate	Between 0.50% and 9.50%
Nicaragua [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		$ 0			12,040
Banco Bogota [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Bonds issued		7,654,906			7,833,991
Grupo Aval Limited [Member] | BAC Credomatic [Member]
Disclosure Of Detailed Information About Borrowing Explanatory [Line Items]
Issue Date	19/09/2012
Bonds issued		$ 3,000,122			$ 2,992,916
Maturity Date		26/09/2022
Interest Rate	4.75%
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

FINANCIAL OBLIGATIONS (Detai205

FINANCIAL OBLIGATIONS (Details 4) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	$ 19,102,196	$ 6,401.5		$ 18,568,236
Less than a year [member]
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	983,915
2,019
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	1,332,505
2,020
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	1,973,046
2,021
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	452,159
More than 5 years [member]
Disclosure of detailed information About Future Maturities of Bonds [Line Items]
Bonds issued	$ 14,360,571
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

FINANCIAL OBLIGATIONS (Detai206

FINANCIAL OBLIGATIONS (Details Textual) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Deposits From Financial Obligations [Abstract]
Short Term Obligations, Simultaneous and Repo Operations	$ 2,272,496	$ 2,436,838
Guaranteed with Investments	$ 3,400,677	$ 5,264,105

EMPLOYEE BENEFITS (Details)

EMPLOYEE BENEFITS (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Net defined benefit liability	$ 1,238,172	$ 414.9		$ 1,097,594
Short-term Benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Net defined benefit liability	404,292			397,460
Post-Employment benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Net defined benefit liability	604,110			509,022
Long-term Benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Net defined benefit liability	$ 229,770			$ 191,112
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

EMPLOYEE BENEFITS (Details 1)

EMPLOYEE BENEFITS (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of net defined benefit liability (asset) [line items]
Changes in actuarial assumptions from changes in demographic assumptions.	$ 100,232	$ 33.6		$ 41,228	$ (6,162)
Post-Employment benefits [Member]
Disclosure of net defined benefit liability (asset) [line items]
Balance at the end of the year	604,110			509,022	436,696
Balance at the beginning of the year	509,022			436,696	442,258
Service costs	4,425			3,006	2,158
Interests cost	51,027			69,348	31,338
Gain on settlements	252			0	0
Past Service Costs	0			0	2,712
Net defined benefit liability asset After Adjustment	564,726			509,050	478,466
Changes in actuarial assumptions from changes in demographic assumptions.	(8,863)			(1,232)	7,171
Changes in actuarial assumptions from changes in financial assumptions.	109,095			42,460	(1,009)
Gain (loss) on remeasurement, net defined benefit liability (asset)	100,232			41,228	6,162
Exchange differences	(982)			6,083	(27)
Payments to employees	(59,866)			(47,337)	(47,905)
Long-term Benefits [Member]
Disclosure of net defined benefit liability (asset) [line items]
Balance at the end of the year	229,770			191,112	206,971
Balance at the beginning of the year	191,112			206,971	188,522
Service costs	18,201			19,243	16,745
Interests cost	8,928			(20,274)	11,975
Gain on settlements	(112)			0	0
Past Service Costs	0			0	2,711
Net defined benefit liability asset After Adjustment	218,129			205,940	219,953
Changes in actuarial assumptions from changes in demographic assumptions.	(1,432)			(6,456)	(2,162)
Changes in actuarial assumptions from changes in financial assumptions.	43,870			18,845	7,515
Gain (loss) on remeasurement, net defined benefit liability (asset)	42,438			12,389	5,353
Exchange differences	0			0	8,236
Payments to employees	$ (30,797)			$ (27,217)	$ (26,571)
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

EMPLOYEE BENEFITS (Details 2)

EMPLOYEE BENEFITS (Details 2)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Post-Employment benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Discount interest rate		6.59%	7.23%
Inflation rate		3.50%	3.50%
Salary growth rate		3.50%	3.50%
Pension growth rate		3.50%	3.50%
Description on actuarial assumption of employee turnover rate	[1]	Tabla de Rotación SoA 2003	Tabla de Rotación SoA 2003
Long-term Benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Discount interest rate		6.33%	7.23%
Inflation rate		3.50%	3.50%
Salary growth rate		3.50%	3.50%
Description on actuarial assumption of employee turnover rate	[1]	Tabla de Rotación SoA 2003	Tabla de Rotación SoA 2003
[1]	For those entities where a sufficiently strong statistic is not yet available to support the actuarial bases, the SoA2003 table is used as a reference. With this table, the probability of permanence of personnel in the entity is established, modified according to the population factor of each benefit.

EMPLOYEE BENEFITS (Details 3)

EMPLOYEE BENEFITS (Details 3) $ in Millions	Dec. 31, 2017COP ($)
Discount interest | Post-Employment benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 910
Discount interest | Long-term Benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	482
Salaries growth rate | Post-Employment benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	492
Salaries growth rate | Long-term Benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	581
Retirement growth rate | Post-Employment benefits [Member]
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 855

EMPLOYEE BENEFITS (Details 4)

EMPLOYEE BENEFITS (Details 4) $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)
Post-Employment benefits [Member] | 2018
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 66,310
Post-Employment benefits [Member] | 2019
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	59,130
Post-Employment benefits [Member] | 2020
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	58,545
Post-Employment benefits [Member] | 2021
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	59,199
Post-Employment benefits [Member] | 2022
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	58,250
Post-Employment benefits [Member] | Years 2023-2027
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	270,420
Long-term Benefits [Member] | 2018
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	34,520
Long-term Benefits [Member] | 2019
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	35,659
Long-term Benefits [Member] | 2020
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	34,883
Long-term Benefits [Member] | 2021
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	30,143
Long-term Benefits [Member] | 2022
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	29,821
Long-term Benefits [Member] | Years 2023-2027
Disclosure Of Defined Benefit Plan Explanatory [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 141,937

EMPLOYEE BENEFITS (Details Text

EMPLOYEE BENEFITS (Details Textual)	Dec. 31, 2017
Percentage of reasonably possible increase and decrease in actuarial assumption	0.50%
Post-Employment benefits [Member]
Number of employees	42,646
Long-term Benefits [Member]
Number of employees	31,987

PROVISIONS FOR LEGAL AND OTH213

PROVISIONS FOR LEGAL AND OTHERS (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of provisions for legal and others [Line Items]
Beginning Balance	$ 620,356			$ 600,227	$ 744,653
Provisions increase during the period	255,019			395,616	85,438
Provision used, other provisions	(132,655)			(332,735)	(87,901)
Amounts reversed due to provisions not utilized	(50,329)			(43,187)	(43,965)
Financial cost					(1,284)
Variations in exchange in foreign currency					195
Reclassification	224			435	(96,909)
Ending Balance	692,615	$ 232.1		620,356	600,227
Legal proceedings provision [member]
Disclosure of provisions for legal and others [Line Items]
Beginning Balance	155,749			148,314	185,656
Provisions increase during the period	32,670			32,405	13,406
Provision used, other provisions	(15,012)			(13,143)	(27,816)
Amounts reversed due to provisions not utilized	(7,870)			(12,938)	(22,932)
Financial cost					0
Variations in exchange in foreign currency					0
Reclassification	(184)			1,111	0
Ending Balance	165,353			155,749	148,314
Miscellaneous other provisions [member]
Disclosure of provisions for legal and others [Line Items]
Beginning Balance	464,607			451,913	558,997
Provisions increase during the period	222,349			363,211	72,032
Provision used, other provisions	(117,643)			(319,592)	(60,085)
Amounts reversed due to provisions not utilized	(42,459)			(30,249)	(21,033)
Financial cost					(1,284)
Variations in exchange in foreign currency					195
Reclassification	408			(676)	(96,909)
Ending Balance	$ 527,262			$ 464,607	$ 451,913
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

PROVISIONS FOR LEGAL AND OTH214

PROVISIONS FOR LEGAL AND OTHERS (Details Textual) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)bbl	Dec. 31, 2016COP ($)	Dec. 31, 2017USD ($)	[1]
Disclosure of provisions for legal and others [Line Items]
Legal proceedings provision	$ 165,353	$ 155,749	$ 55.4
Other provisions	527,262	464,607	$ 176.7
Cost of buiolding pipeline	$ 50,107	43,592
Area of land under litigation | bbl	37,018
Miscellaneous other provisions [member]
Disclosure of provisions for legal and others [Line Items]
Legal proceedings provision	$ 50,042	44,233
Other provisions	527,262	464,607
Miscellaneous other provisions [member] | Porvenir [Member]
Disclosure of provisions for legal and others [Line Items]
Legal proceedings provision	20,449	15,550
Other provisions	175,000	173,541
Miscellaneous other provisions [member] | Corficolombiana [Member]
Disclosure of provisions for legal and others [Line Items]
Other provisions	229,447	204,670
Miscellaneous other provisions [member] | Compania Hotelera Cartagena de Indias [Member]
Disclosure of provisions for legal and others [Line Items]
Legal proceedings provision	24,815	23,289
Provision for decommissioning, restoration and rehabilitation costs [member]
Disclosure of provisions for legal and others [Line Items]
Other provisions	50,541	38,292
Administrative And Other Proceedings [Member]
Disclosure of provisions for legal and others [Line Items]
Provisions for administrative and other proceedings attributable to contracts	68,526	65,042
Labor Proceedings [Member]
Disclosure of provisions for legal and others [Line Items]
Provision for labour proceedings attributable to pension plans	$ 46,785	$ 46,475
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

OTHER LIABILITIES (Details)

OTHER LIABILITIES (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of accounts Payable and other liabilities [Abstract]
Suppliers and services payable	$ 1,818,103			$ 1,609,361
Cashier checks	697,575			802,270
Dividends payable	590,040			644,733
Non-financial liabilities	500,209			580,842
Withholdings taxes and labor contributions	456,411			496,437
Commissions and fees	399,155			197,322
Collection service	285,017			235,325
Collection on behalf of third parties	272,206			256,035
Affiliate establishments	248,064			194,221
Canceled accounts	81,841			28,649
Tax levies	73,696			72,790
Checks drawn and not paid	39,624			41,093
Financial transactions tax	37,042			42,110
Insurance payables	32,410			29,962
Promissory buyers	24,049			27,819
Contributions and affiliations	23,173			28,380
Leases	10,912			8,054
Cash surplus	9,272			8,081
Deferred credits	1,012			1,051
Compensation to customers	778			1,151
Other liabilities	634,877			651,506
Total	$ 6,235,466	$ 2,089.6		$ 5,957,192
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

CONTROLLING INTEREST EQUITY (De

CONTROLLING INTEREST EQUITY (Details) - shares		Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Disclosure of controlling interest equity [Line Items]
Authorized shares			120,000,000,000	120,000,000,000
Subscribed fully paid shares			22,281,017,159	22,281,017,159
Subscribed but pending to be paid shares Total outstanding shares			22,281,017,159	22,281,017,159
Number of shares outstanding		22,281,017,159	22,281,017,159		22,281,017,159	22,281,017,159
Common voting shares [Member]
Disclosure of controlling interest equity [Line Items]
Number of shares outstanding	[1]		15,173,180,765	15,254,876,823
Preferred non-voting shares [Member]
Disclosure of controlling interest equity [Line Items]
Number of shares outstanding	[1]		7,107,836,394	7,026,140,336
[1]	Since 2011, Grupo Aval allows its shareholders to convert their common shares into preferred shares. For the years ended December 31, 2017 and 2016, 81,696,058 and 12,086,836 common shares were converted into preferred shares, respectively. Preferred shares have the right to receive a preferential minimum dividend of one Colombian peso (Ps. 1) per semester per share. This preferential minimum dividend is only applicable when dividends declared for common shares are less than one Colombian peso (Ps. 1). Preferential minimum dividends are not cumulative.

CONTROLLING INTEREST EQUITY 217

CONTROLLING INTEREST EQUITY (Details 1) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)
Disclosure of controlling interest equity [Abstract]
Retained earnings	$ 1,829,515			$ 919,601
Legal reserve	11,140			11,140
Statutory and voluntary reserves	5,333,763			5,591,387
Other reserves	$ 7,174,418	$ 2,404.3		$ 6,522,128
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

CONTROLLING INTEREST EQUITY 218

CONTROLLING INTEREST EQUITY (Details 2) - COP ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2017	Mar. 31, 2018
Disclosure of controlling interest equity [Line Items]
Net income for the periods ended in	$ 1,258,835	$ 1,086,061	$ 1,053,594
Cash dividends declared	29.40 per share payable in six (6) installments of P.s. 4.90 per share between October 2016 and March 2017 (based on profits from the first half of 2016)	29.40 per share payable in six (6) installments of P.s. 4.90 per share between April 2016 and September 2016 (based on profits from the second half of 2015)	In the general assembly held in March 2017, 58.80 pesos per share payable in twelve installments of 4.90 pesos per share, from April 2017 to March 2018.
Number of shares outstanding	22,281,017,159	22,281,017,159	22,281,017,159	22,281,017,159
Total dividends declared	$ 655,062	$ 655,062	$ 1,310,124
Ordinary shares [member]
Disclosure of controlling interest equity [Line Items]
Number of shares outstanding	15,258,916,143	15,265,983,336	15,240,124,702	15,170,666,914
Preference shares [member]
Disclosure of controlling interest equity [Line Items]
Number of shares outstanding	7,022,101,016	7,015,033,823	7,040,892,457	7,110,350,245

CONTROLLING INTEREST EQUITY 219

CONTROLLING INTEREST EQUITY (Details 3) $ / shares in Units, $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)$ / sharesshares	Dec. 31, 2017USD ($)shares		Dec. 31, 2016COP ($)$ / sharesshares	Dec. 31, 2015COP ($)$ / sharesshares
Disclosure of controlling interest equity [Line Items]
Net income for the year		$ 3,162,433	$ 1,059.8	[1]	$ 3,516,936	$ 3,345,686
Less: participation of non- controlling interests		(1,200,019)	(402.2)	[1]	(1,377,070)	(1,304,322)
Net income attributable to controlling interest		1,962,414	$ 657.6	[1]	2,139,866	2,041,364
Less: preferred dividends declared | $		0			0	0
Less: Allocation of undistributed earnings to preferred stockholders | $	[2],[3]	(622,215)			(674,042)	(638,734)
Net Income allocated to common shareholders for basic and diluted EPS | $		$ 1,340,199			$ 1,465,824	$ 1,402,630
Weighted average of the common and preferred shares used in the calculation of net income for basic shares (common and preferential) | shares		22,281,017,159	22,281,017,159		22,281,017,159	22,281,017,159
Basic net income of the owners of the parent per share | $ / shares		$ 88.076			$ 96.040	$ 91.619
Ordinary shares [member]
Disclosure of controlling interest equity [Line Items]
Weighted average number of common shares outstanding used in basic EPS calculation (2) | shares	[2]	15,216,468,601	15,216,468,601		15,262,660,115	15,309,380,685
Basic and diluted earnings (loss) per share | $ / shares		$ 88.076			$ 96.04	$ 91.619
American depositary Shares [Member]
Disclosure of controlling interest equity [Line Items]
Basic and diluted earnings (loss) per share | $ / shares	[4]	$ 1,761.51			$ 1,920.8	$ 1,832.38
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Averages based on an end of month number of preferred or common shares
[3]	Based on a weighted average of 7,018,357,044 preferred shares for 2016, 6,971,636,474 preferred shares for 2015 and 5,490,721,740 preferred shares for 2014
[4]	Each ADS represents 20 preferred shares

CONTROLLING INTEREST EQUITY 220

CONTROLLING INTEREST EQUITY (Details 4) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Balance at the beginning of the year	$ 749,617			$ 976,597	$ 698,038
Current-period change	37,249			302,207	278,559
Balance at the end of the year	786,866	$ 263.7		749,617	976,597
Non-controlling interests [member]
Balance at the beginning of the year	529,187			438,468	325,710
Current-period change	38,121			90,719	112,758
Balance at the end of the year	567,308			529,187	438,468
Equity attributable to owners of parent [member]
Balance at the beginning of the year	749,617			538,129	372,328
Current-period change	37,249			211,488	165,801
Balance at the end of the year	786,866			749,617	538,129
Income tax [Member]
Balance at the beginning of the year	1,276,840			1,641,196	442,582
Current-period change	(73,617)			(364,356)	1,198,614
Balance at the end of the year	1,203,223			1,276,840	1,641,196
Actuarial gains (losses) from defined benefit pension plans [Member]
Balance at the beginning of the year	(32,225)			9,003	2,841
Current-period change	(100,232)			(41,228)	6,162
Balance at the end of the year	(132,457)			(32,225)	9,003
Investments in associates and join ventures [Member]
Balance at the beginning of the year	91,761			111,822	79,858
Current-period change	1,128			(20,061)	31,964
Balance at the end of the year	92,889			91,761	111,822
AOCI related to equity securities [Member]
Balance at the beginning of the year	489,884			455,375	461,923
Current-period change	57,245			34,509	(6,548)
Balance at the end of the year	547,129			489,884	455,375
AOCI related to debt securities [Member]
Balance at the beginning of the year	(272,216)			(1,220,428)	(298,345)
Current-period change	284,480			948,212	(922,083)
Balance at the end of the year	12,264			(272,216)	(1,220,428)
AOCI related to foreign currency translation differences [Member]
Balance at the beginning of the year	(73,922)			51,239	26,361
Current-period change	(91,497)			(125,161)	24,878
Balance at the end of the year	(165,419)			(73,922)	51,239
AOCI related to cash flow hedges [Member]
Balance at the beginning of the year	6,210			(11,757)	(29,257)
Current-period change	(2,340)			17,967	17,500
Balance at the end of the year	3,870			6,210	(11,757)
Hedging non-derivative instrument [Member]
Balance at the beginning of the year	(1,203,245)			(1,239,064)	(483,633)
Current-period change	30,568			35,819	(755,431)
Balance at the end of the year	(1,172,677)			(1,203,245)	(1,239,064)
Hedging derivative instrument [Member]
Balance at the beginning of the year	(2,262,751)			(2,554,257)	(870,911)
Current-period change	16,832			291,506	(1,683,346)
Balance at the end of the year	(2,245,919)			(2,262,751)	(2,554,257)
Net Investment in foreign subsidiaries operations [Member]
Balance at the beginning of the year	3,258,469			3,733,469	1,366,620
Current-period change	(47,197)			(475,000)	2,366,849
Balance at the end of the year	$ 3,211,272			$ 3,258,469	$ 3,733,469
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

CONTROLLING INTEREST EQUITY 221

CONTROLLING INTEREST EQUITY (Details Textual) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of controlling interest equity [Line Items]
Common stock conversion to Preferred Stock	81,696,058	12,086,836
Description of preferential rights of preferred shareholders	Preferred shares have the right to receive a preferential minimum dividend of one Colombian peso (Ps. 1) per semester per share. This preferential minimum dividend is only applicable when dividends declared for common shares are less than one Colombian peso (Ps. 1). Preferential minimum dividends are not cumulative.
Description of creation of reserve through appropriation	create a legal reserve through the appropriation of ten percent (10%) of the net profits of each year up to an amount equal to fifty percent (50%) of the subscribed capital stock. This reserve may be reduced below fifty percent (50%) of the subscribed capital stock to stem losses in excess of retained earnings.
Number Of Preferred Shares Per ADS	20	20	20
Preference shares [member]
Disclosure of controlling interest equity [Line Items]
Weighted average number of ordinary shares outstanding	7,064,548,558	7,018,357,044	6,971,636,474

NON- CONTROLLING INTEREST (Deta

NON- CONTROLLING INTEREST (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)		Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)	[1]
Disclosure of non-controlling interest [Line Items]
Non- controlling Interest share of equity	$ 9,584,231			$ 9,057,669		$ 3,211.9
Non- controlling interest share of net income	1,200,019	$ 402.2	[1]	1,377,070	$ 1,304,322
Dividends paid to non- controlling interest in the year	$ (768,748)			$ (727,199)
Corporación Financiera Colombiana S.A.
Disclosure of non-controlling interest [Line Items]
Country	Colombia	Colombia		Colombia
Non- controlling Interest	55.21%	55.21%		55.51%
Non- controlling Interest share of equity	$ 3,448,933			$ 3,154,158
Non- controlling interest share of net income	462,137			590,036
Dividends paid to non- controlling interest in the year	$ (340,381)			$ (294,376)
Banco Bogota S.A.
Disclosure of non-controlling interest [Line Items]
Country	Colombia	Colombia		Colombia
Non- controlling Interest	31.26%	31.26%		31.26%
Non- controlling Interest share of equity	$ 5,395,664			$ 4,882,747
Non- controlling interest share of net income	619,515			685,073
Dividends paid to non- controlling interest in the year	$ (322,985)			$ (332,460)
Banco de Occidente S.A.
Disclosure of non-controlling interest [Line Items]
Country	Colombia	Colombia		Colombia
Non- controlling Interest	27.73%	27.73%		27.73%
Non- controlling Interest share of equity	$ 256,858			$ 568,263
Non- controlling interest share of net income	65,941			53,256
Dividends paid to non- controlling interest in the year	$ (84,339)			$ (83,166)
Banco Popular S.A.
Disclosure of non-controlling interest [Line Items]
Country	Colombia	Colombia		Colombia
Non- controlling Interest	6.26%	6.26%		6.26%
Non- controlling Interest share of equity	$ 184,126			$ 165,150
Non- controlling interest share of net income	25,163			12,347
Dividends paid to non- controlling interest in the year	$ (6,690)			$ (9,529)
Banco Comercial AV Villas S.A.
Disclosure of non-controlling interest [Line Items]
Country	Colombia	Colombia		Colombia
Non- controlling Interest	20.13%	20.13%		20.13%
Non- controlling Interest share of equity	$ 298,651			$ 287,351
Non- controlling interest share of net income	27,263			36,358
Dividends paid to non- controlling interest in the year	$ (14,353)			$ (7,668)
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

NON- CONTROLLING INTEREST (D223

NON- CONTROLLING INTEREST (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)		Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)	[1]
Disclosure of non-controlling interest [Line Items]
Assets	$ 236,538,540			$ 224,073,721			$ 79,268.9
Liabilities	210,667,313			199,414,499			$ 70,598.8
Revenue	26,624,025			25,937,238		$ 21,147,421
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	3,162,433	$ 1,059.8		3,516,936		3,345,686
Comprehensive income	3,237,803	1,085		3,819,143		3,624,245
Cash flows from (used in) operating activities	5,108,316	$ 1,712		2,485,034		$ 11,354,990
Corporacion Financiera Colombiana S.A.
Disclosure of non-controlling interest [Line Items]
Assets	21,115,000			20,504,644
Liabilities	15,872,265			15,604,999
Revenue	2,313,589			2,135,834
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	563,553			671,336
Comprehensive income	615,754			537,304
Cash flows from (used in) operating activities	3,428,076			1,378,419
Banco Bogota S.A.
Disclosure of non-controlling interest [Line Items]
Assets	149,389,133			141,430,749	[2]
Liabilities	131,197,065			124,192,566	[2]
Revenue	16,396,415			18,141,612	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,132,951			4,432,026	[2]
Comprehensive income	880,565			970,007	[2]
Cash flows from (used in) operating activities	1,571,203			313,112	[2]
Banco de Occidente S.A.
Disclosure of non-controlling interest [Line Items]
Assets	37,746,874			35,568,507
Liabilities	33,342,596			31,177,321
Revenue	4,132,220			4,054,750
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	377,686			627,993
Comprehensive income	187,037			242,389
Cash flows from (used in) operating activities	797,598			(402,394)
Banco Popular S.A.
Disclosure of non-controlling interest [Line Items]
Assets	22,322,103			20,731,144
Liabilities	19,651,056			18,052,231
Revenue	2,537,768			2,478,501
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	205,694			181,075
Comprehensive income	153,208			278,374
Cash flows from (used in) operating activities	756,955			(106,977)
Banco Comercial AV Villas S.A.
Disclosure of non-controlling interest [Line Items]
Assets	12,318,124			12,466,634
Liabilities	10,853,638			11,063,550
Revenue	1,645,948			1,554,428
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	137,695			179,550
Comprehensive income	788			(19,599)
Cash flows from (used in) operating activities	$ (1,295,251)			$ 216,083
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Includes Ps. 2,208,053 related to the effect of the deconsolidation of Corficolombiana, refer to Note 1 for more information.

COMMITMENTS AND CONTINGENCIE224

COMMITMENTS AND CONTINGENCIES (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	$ 27,223,238	$ 27,587,721
Financial liabilities, at fair value	69,250	65,599
Guarantees
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	3,495,921	3,510,546
Financial liabilities, at fair value	58,936	61,030
Unused letters of credit
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	1,177,697	1,084,589
Financial liabilities, at fair value	10,314	4,569
Unused limits of overdrafts
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	75,225	128,621
Financial liabilities, at fair value	0	0
Unused credit card limits
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	18,025,620	17,383,743
Financial liabilities, at fair value	0	0
Other
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	4,448,775	5,480,222
Financial liabilities, at fair value	$ 0	$ 0

COMMITMENTS AND CONTINGENCIE225

COMMITMENTS AND CONTINGENCIES (Details 1) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	$ 27,223,238	$ 27,587,721
Colombian Pesos
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	10,271,676	13,608,215
U.S. dollars
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	16,589,399	13,626,359
Euro
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	85,887	37,263
Other
Disclosure Of Commitments And Contingencies [Line Items]
Undrawn borrowing facilities	$ 276,276	$ 315,884

COMMITMENTS AND CONTINGENCIE226

COMMITMENTS AND CONTINGENCIES (Details 2) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Commitments And Contingencies [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 1,006,169	$ 1,054,640
Up to one year [member]
Disclosure Of Commitments And Contingencies [Line Items]
Minimum lease payments payable under non-cancellable operating lease	246,373	200,796
Greater than one year and up to five years [member]
Disclosure Of Commitments And Contingencies [Line Items]
Minimum lease payments payable under non-cancellable operating lease	526,557	544,148
More than five years [member]
Disclosure Of Commitments And Contingencies [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 233,239	$ 309,696

COMMITMENTS AND CONTINGENCIE227

COMMITMENTS AND CONTINGENCIES (Details Textual) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Commitments And Contingencies [Line Items]
Capital commitments	$ 110,681	$ 62,885
Labor Proceedings [Member]
Disclosure Of Commitments And Contingencies [Line Items]
Legal Proceedings	105,748	30,358
Civil Proceedings [Member]
Disclosure Of Commitments And Contingencies [Line Items]
Legal Proceedings	453,592	432,334
Administrative And Other Proceedings [Member]
Disclosure Of Commitments And Contingencies [Line Items]
Provisions for administrative and other proceedings	$ 81,117	$ 42,723

INCOME (EXPENSE) COMMISSIONS228

INCOME (EXPENSE) COMMISSIONS AND FEES (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of Income or Expenses Commissions And Fees [Abstract]
Commissions on banking services	$ 2,567,704			$ 2,436,692	$ 1,751,527
Fees on credit cards	1,112,319			1,034,763	1,223,189
Pension and severance fund management	926,771			824,089	787,692
Trust activities	311,837			275,719	233,892
Storage services	169,815			186,068	167,323
Commissions on drafts, checks and checkbooks	60,768			67,832	71,294
Office network services	42,639			43,508	39,709
Other commissions	10,272			10,516	9,607
Total	5,202,125	$ 1,743.3		4,879,187	4,284,233
Banking Services	(332,811)			(318,672)	(288,303)
Sales and Services Commissions	(119,987)			(99,659)	(90,202)
Affiliations to Pension Funds	(74,531)			(68,454)	(67,854)
Offices Network Services	(29,874)			(33,404)	(34,437)
Information Processing Services of Operators	(23,039)			(20,963)	(18,273)
Collection Service of Contributions to Financial Entities	(5,618)			(6,084)	(4,962)
Fiduciary Businesses	(41)			(256)	(238)
Banks Guarantees	(88)			(87)	(131)
Credit Cards	(2)			(14)	(110)
Other	(37,123)			(71,935)	(117,436)
Total	(623,114)	(208.8)		(619,528)	(621,946)
Net commission and fee income	$ 4,579,011	$ 1,534.5		$ 4,259,659	$ 3,662,287
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

NET TRADING INCOME (Details)

NET TRADING INCOME (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure Of Net Trading Income [Line Items]
Net trading income		$ 561,362	$ 188.1		$ 724,698	$ 245,199
Trading securities [member]
Disclosure Of Net Trading Income [Line Items]
Fixed income securities	[2]	218,994			369,184	143,179
Equities	[2]	177,448			127,431	41,997
Net trading income	[2]	396,442			496,615	185,176
Derivatives [member]
Disclosure Of Net Trading Income [Line Items]
Net trading income		164,920			228,083	60,023
Net income (loss) on financial derivatives	[3]	(75,224)			10,593	(156,820)
Other trading income	[4]	$ 240,144			$ 217,490	$ 216,843
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Includes net trading income from investment securities held for trading, that reflects the interest from investment in debt securities, gains/losses from mark-to-market valuation from investment in equity and debt securities and net income from trading activities.
[3]	Includes net trading income from derivatives, which reflects the gains/losses from mark-to-market valuation on trading derivatives.
[4]	Includes gains/losses from: (i) Net changes in the valuation of hedging derivatives from mark-to-market valuations from unhedged , (ii) the ineffective portion of the hedge, (iii) Transfers of due hedging derivatives from OCI to the statement of income.

OTHER INCOME AND EXPENSE (Detai

OTHER INCOME AND EXPENSE (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[2]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure of Other income and expense [Line Items]
Income from non-financial sector entities	[1]	$ 757,023			$ 929,294	$ 838,578
Foreign exchange gains (losses), net		424,483			517,902	457,904
Share of profit of equity accounted investees, net of tax		171,964			140,765	230,398
Net gain on sale of debt and equity securities		51,712			210,373	79,233
Dividends		50,439			28,027	33,611
Gain on the sale of non-current assets held for sale		13,568			28,392	26,211
Other income		439,579			750,648	723,361
Total		1,908,768	$ 639.7		2,605,401	2,389,296
Personnel expenses		3,671,117			3,531,087	3,111,306
Taxes and fees		731,316			633,260	557,046
Depreciation and amortization		521,408			471,608	488,212
Consultancy, audit and other fees		460,978			355,590	282,181
Affiliation contributions and transfers		429,825			428,581	349,961
Wealth tax	[3]	101,988			267,627	303,193
Leases (Rent)		431,507			440,777	396,922
Maintenance and repairs		392,271			317,170	209,804
Insurance		351,745			316,852	282,452
Markenting		314,657			344,423	299,281
Warehouse services		277,849			288,491	276,343
Transportation services		166,429			160,002	150,866
Cleaning and security services		131,451			138,693	135,299
Outsourcing services expenses		128,656			184,330	131,236
Supplies and stationary		82,113			23,722	44,514
Electronic data processing		73,872			81,682	66,813
Adaptation and installation		62,809			67,938	57,566
Travel expenses		48,193			54,275	49,876
Other		450,652			413,665	416,244
Total		$ 8,828,836	$ 2,958.7		$ 8,519,773	$ 7,609,115
[1]	Income from the non-financial sector, net results from revenues amounting to Ps 5,792,850, Ps 6,654,622 and Ps 5,198,754 less costs and expenses of Ps 5,035,827, Ps 5,725,328 and Ps 4,360,176 for the years ended 2017, 2016 and 2015, respectively.
[2]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[3]	Grupo Aval and its subsidiaries in Colombia are subject to wealth tax for the years 2015, 2016 and 2017 by Law 1739 of 2014, based on their fiscal net asset value as of January 1, 2015, 2016 and 2017, greater or equal to Ps. 1,000, less the exclusions expressly provided for in the tax regulation, including the net asset value of the shares held in national companies. The wealth tax is calculated at progressive rates depending on the amount of liquid equity, and rates range between 0.20% and 1.15% in 2015, 0.15% and 1% in 2016, and 0.05% and 0.40% in 2017.

OTHER INCOME AND EXPENSE (De231

OTHER INCOME AND EXPENSE (Details Textual) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Bottom of range [member]
Disclosure of Other income and expense [Line Items]
Wealth tax rate	0.05%	0.15%	0.20%
Top of range [member]
Disclosure of Other income and expense [Line Items]
Wealth tax rate	0.40%	1.00%	1.15%
Non Financial sector [Member]
Disclosure of Other income and expense [Line Items]
Other revenue	$ 5,792,850	$ 6,654,622	$ 5,198,754
Cost And Expense	$ 5,035,827	$ 5,725,328	$ 4,360,176

ANALYSIS OF OPERATING SEGMEN232

ANALYSIS OF OPERATING SEGMENTS (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)		Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)		Dec. 31, 2015COP ($)		Dec. 31, 2017USD ($)
Assets
Held-for-trading financial assets	$ 5,128,088				$ 4,593,725				$ 1,718.5
Available-for-sale financial assets	18,614,160				18,392,512				6,238	[1]
Held-to-maturity investments	2,899,039				2,570,486				971.5	[1]
Investments in associates and joint ventures	1,043,014				1,146,647				349.5	[1]
Loans and receivables	160,754,295				150,898,732				53,872	[1]
Other Assets	48,099,944				46,471,619
Total Assets	236,538,540				224,073,721				79,268.9	[1]
Liabilities
Customer Deposits	154,885,224				143,887,055				51,905.2	[1]
Financial Obligations	45,276,036				45,516,281				15,172.9	[1]
Other Liabilities	10,506,053				10,011,163
Total Liabilities	210,667,313				199,414,499				$ 70,598.8	[1]
Income
Interest income	18,741,833		$ 6,280.7		17,546,970		$ 14,075,598
Commission and fee income	5,202,125				4,879,187		4,284,233
Participation in profit or loss associates and joint business	171,964				140,765		230,398
Dividends	50,439				28,027		33,611
Other Income	2,457,664				3,342,289		2,523,581
Total income	26,624,025				25,937,238		21,147,421
Expenses
Interest expense	8,227,699		2,757.3		8,392,405		5,751,459
Impairment loss on loan and other accounts receivable	4,119,334				3,004,184		2,127,750
Depreciations and amortizations	521,408				471,608		488,212
Commission and fee expense	623,114		208.8		619,528		621,946
Administrative Expenses	4,513,148				4,409,199		3,878,786
Other expense	3,704,095				3,466,469		3,054,612
Income tax expense	1,752,794		$ 587.4		2,056,909		1,878,970
Total Expenses	23,461,592				22,420,302		17,801,735
Net income for the year	3,162,433				3,516,936		3,345,686
Intersegment Income [Member]
Income
Interest income	0				0		0
Commission and fee income	0				0		0
Participation in profit or loss associates and joint business	0				0		0
Dividends	0				0		0
Other Income	0				0		0
Total income	0				0		0
Banco Bogota S.A. [Member]
Assets
Held-for-trading financial assets	2,590,371				2,179,411
Available-for-sale financial assets	9,949,001				9,157,156
Held-to-maturity investments	1,367,582				1,256,607
Investments in associates and joint ventures	3,417,702				3,354,551
Loans and receivables	104,243,806				97,169,521
Other Assets	27,820,671				28,313,503
Total Assets	149,389,133				141,430,749
Liabilities
Customer Deposits	100,947,244				93,676,674
Financial Obligations	25,294,735				25,863,311
Other Liabilities	4,955,086				4,652,581
Total Liabilities	131,197,065				124,192,566
Income
Total income	16,396,415				18,107,549	[2]	13,004,951
Expenses
Interest expense	4,594,100				4,568,469	[2]	3,211,117
Impairment loss on loan and other accounts receivable	2,459,293				1,897,902	[2]	1,323,338
Depreciations and amortizations	361,621				352,618	[2]	358,517
Commission and fee expense	351,073				347,612	[2]	327,250
Administrative Expenses	3,035,346				2,943,832	[2]	2,508,967
Other expense	2,491,824				2,414,696	[2]	2,168,527
Income tax expense	970,207				1,150,393	[2]	1,047,656
Total Expenses	14,263,464				13,675,522	[2]	10,945,372
Net income for the year	2,132,951				4,432,027	[2]	2,059,579
Banco Bogota S.A. [Member] | External Income [Member]
Income
Interest income	11,241,897				10,481,965	[2]	8,511,619
Commission and fee income	4,187,221				3,957,774	[2]	3,432,513
Participation in profit or loss associates and joint business	5,847				(4,275)	[2]	178,243
Dividends	1,321				1,779	[2]	417
Other Income	819,797				1,336,185	[2]	706,302
Total income	16,256,083				15,773,428	[2]	12,829,094
Banco Bogota S.A. [Member] | Intersegment Income [Member]
Income
Interest income	72,910				219,995	[2]	(32,382)
Commission and fee income	2,988				900	[2]	471
Participation in profit or loss associates and joint business	36,782				116,488	[2]	(1,439)
Dividends	3,101				0	[2]	2,105
Other Income	24,551				1,996,738	[2]	207,102
Total income	140,332				2,334,121	[2]	175,857
Banco de Occidente S.A. [Member]
Assets
Held-for-trading financial assets	584,470				645,607
Available-for-sale financial assets	4,526,311				3,991,626
Held-to-maturity investments	689,023				542,008
Investments in associates and joint ventures	672,169				570,782
Loans and receivables	27,480,881				26,573,862
Other Assets	3,794,020				3,244,622
Total Assets	37,746,874				35,568,507
Liabilities
Customer Deposits	26,169,109				24,176,056
Financial Obligations	5,802,728				5,504,607
Other Liabilities	1,370,759				1,496,658
Total Liabilities	33,342,596				31,177,321
Income
Total income	4,132,220				4,054,751		3,354,125
Expenses
Interest expense	1,388,144				1,455,389		989,836
Impairment loss on loan and other accounts receivable	993,350				579,471		544,143
Depreciations and amortizations	69,255				64,252		61,396
Commission and fee expense	94,089				99,804		151,038
Administrative Expenses	703,106				632,153		586,050
Other expense	390,812				363,398		352,957
Income tax expense	115,778				232,292		195,606
Total Expenses	3,754,534				3,426,759		2,881,026
Net income for the year	377,686				627,992		473,099
Banco de Occidente S.A. [Member] | External Income [Member]
Income
Interest income	3,450,056				3,363,556		2,648,326
Commission and fee income	396,658				387,986		394,039
Participation in profit or loss associates and joint business	2,402				(484)		20,674
Dividends	370				1,150		2,638
Other Income	49,916				93,860		105,337
Total income	3,899,402				3,846,068		3,171,014
Banco de Occidente S.A. [Member] | Intersegment Income [Member]
Income
Interest income	1,818				2,893		2,570
Commission and fee income	5,171				4,386		4,752
Participation in profit or loss associates and joint business	139,555				118,109		75,227
Dividends	5,494				20,336		25,127
Other Income	80,780				62,959		75,435
Total income	232,818				208,683		183,111
Banco Popular S.A [Member]
Assets
Held-for-trading financial assets	217,354				228,176
Available-for-sale financial assets	2,172,140				2,046,466
Held-to-maturity investments	483,796				409,131
Investments in associates and joint ventures	10,965				9,103
Loans and receivables	17,034,186				16,016,683
Other Assets	2,403,662				2,021,585
Total Assets	22,322,103				20,731,144
Liabilities
Customer Deposits	15,968,499				14,733,350
Financial Obligations	2,778,675				2,451,314
Other Liabilities	903,882				867,567
Total Liabilities	19,651,056				18,052,231
Income
Total income	2,537,768				2,477,358		2,004,718
Expenses
Interest expense	977,441				995,070		583,151
Impairment loss on loan and other accounts receivable	258,926				229,948		63,180
Depreciations and amortizations	45,417				40,449		39,130
Commission and fee expense	86,228				83,857		54,774
Administrative Expenses	520,204				501,664		465,226
Other expense	334,944				293,930		276,905
Income tax expense	108,914				151,365		173,060
Total Expenses	2,332,074				2,296,283		1,655,426
Net income for the year	205,694				181,075		349,292
Banco Popular S.A [Member] | External Income [Member]
Income
Interest income	2,196,753				2,042,878		1,623,643
Commission and fee income	224,233				219,717		180,302
Participation in profit or loss associates and joint business	2,622				388		2,002
Dividends	1,991				3,112		2,534
Other Income	94,577				183,931		162,605
Total income	2,520,176				2,450,026		1,971,086
Banco Popular S.A [Member] | Intersegment Income [Member]
Income
Interest income	1,047				848		633
Commission and fee income	4,133				2,282		3,091
Participation in profit or loss associates and joint business	(376)				(1,206)		(1,229)
Dividends	6,810				25,293		30,989
Other Income	5,978				115		148
Total income	17,592				27,332		33,632
Banco AV Villas S.A [Member]
Assets
Held-for-trading financial assets	328,070				182,936
Available-for-sale financial assets	396,128				1,478,433
Held-to-maturity investments	274,150				250,980
Investments in associates and joint ventures	1,597				0
Loans and receivables	9,977,597				8,981,858
Other Assets	1,340,582				1,572,427
Total Assets	12,318,124				12,466,634
Liabilities
Customer Deposits	10,086,106				9,706,084
Financial Obligations	212,914				975,300
Other Liabilities	554,618				382,166
Total Liabilities	10,853,638				11,063,550
Income
Total income	1,645,948				1,553,757		1,313,029
Expenses
Interest expense	423,069				451,224		273,944
Impairment loss on loan and other accounts receivable	327,833				236,434		188,895
Depreciations and amortizations	29,897				24,787		22,571
Commission and fee expense	108,572				98,738		85,195
Administrative Expenses	375,522				324,787		302,765
Other expense	180,186				158,243		155,355
Income tax expense	63,174				79,994		108,704
Total Expenses	1,508,253				1,374,207		1,137,429
Net income for the year	137,695				179,550		175,600
Banco AV Villas S.A [Member] | External Income [Member]
Income
Interest income	1,305,784				1,193,544		986,384
Commission and fee income	250,824				237,762		218,769
Participation in profit or loss associates and joint business	2,043				729		1,523
Dividends	1,514				2,941		1,909
Other Income	62,642				99,701		90,644
Total income	1,622,807				1,534,677		1,299,229
Banco AV Villas S.A [Member] | Intersegment Income [Member]
Income
Interest income	4,797				6,223		2,467
Commission and fee income	15,065				13,170		11,895
Participation in profit or loss associates and joint business	132				(1,923)		(2,055)
Dividends	1,170				0		0
Other Income	1,977				1,610		1,493
Total income	23,141				19,080		13,800
Corficolombiana [Member]
Assets
Held-for-trading financial assets	1,577,734				1,499,533
Available-for-sale financial assets	2,541,683				2,773,149
Held-to-maturity investments	84,488				111,760
Investments in associates and joint ventures	820,125				932,586
Loans and receivables	2,785,100				3,141,864
Other Assets	13,305,870				12,045,752
Total Assets	21,115,000				20,504,644
Liabilities
Customer Deposits	4,095,692				3,846,793
Financial Obligations	8,875,171				9,288,278
Other Liabilities	2,901,402				2,469,928
Total Liabilities	15,872,265				15,604,999
Income
Total income	2,313,589				2,316,815		1,892,991
Expenses
Interest expense	852,501				947,603		607,989
Impairment loss on loan and other accounts receivable	79,932				59,176		8,468
Depreciations and amortizations	5,881				4,513		5,810
Commission and fee expense	10,772				8,970		18,013
Administrative Expenses	119,271				138,626		90,812
Other expense	241,636				104,944		73,262
Income tax expense	440,043				381,647		330,889
Total Expenses	1,750,036				1,645,479		1,135,243
Net income for the year	563,553				671,336		757,748
Corficolombiana [Member] | External Income [Member]
Income
Interest income	547,028				442,398		304,109
Commission and fee income	95,086				63,763		58,610
Participation in profit or loss associates and joint business	159,050				144,407		27,956
Dividends	45,243				18,973		26,113
Other Income	1,413,594				1,647,967		1,263,449
Total income	2,260,001				2,317,508		1,680,237
Corficolombiana [Member] | Intersegment Income [Member]
Income
Interest income	62,097				75,641		30,274
Commission and fee income	1,339				2,115		2,693
Participation in profit or loss associates and joint business	159				100		178,305
Dividends	1,244				944		0
Other Income	(11,251)				(79,493)		1,482
Total income	53,588				(693)		212,754
Elimination of intersegment amounts [member]
Assets
Held-for-trading financial assets	(169,911)	[3]			(141,938)	[4]
Available-for-sale financial assets	(971,103)	[3]			(1,054,318)	[4]
Held-to-maturity investments	0	[3]			0	[4]
Investments in associates and joint ventures	(3,879,544)	[3]			(3,720,375)	[4]
Loans and receivables	(767,275)	[3]			(985,056)	[4]
Other Assets	(564,861)	[3]			(726,270)	[4]
Total Assets	(6,352,694)	[3]			(6,627,957)	[4]
Liabilities
Customer Deposits	(2,381,426)	[3]			(2,251,902)	[4]
Financial Obligations	2,311,813	[3]			1,433,471	[4]
Other Liabilities	(179,694)	[3]			142,263	[4]
Total Liabilities	(249,307)	[3]			(676,168)	[4]
Income
Total income	(401,915)	[3]			(2,572,992)	[2],[4]	(422,393)	[4]
Expenses
Interest expense	(7,556)	[3]			(25,350)	[2],[4]	85,422
Impairment loss on loan and other accounts receivable	0	[3]			1,253	[2],[4]	(274)
Depreciations and amortizations	9,337	[3]			(15,011)	[2],[4]	788
Commission and fee expense	(27,620)	[3]			(19,453)	[2],[4]	(14,324)
Administrative Expenses	(240,301)	[3]			(131,863)	[2],[4]	(75,034)
Other expense	64,693	[3]			131,258	[2],[4]	27,606
Income tax expense	54,678	[3]			61,218	[2],[4]	23,055
Total Expenses	(146,769)	[3]			2,052	[2],[4]	47,239
Net income for the year	(255,146)	[3]			(2,575,044)	[2],[4]	(469,632)
Elimination of intersegment amounts [member] | External Income [Member]
Income
Interest income	315	[3]			22,629	[2],[4]	1,517	[4]
Commission and fee income	48,103	[3]			12,185	[2],[4]	0	[4]
Participation in profit or loss associates and joint business	0	[3]			0	[2],[4]	0	[4]
Dividends	0	[3]			72	[2],[4]	0	[4]
Other Income	17,138	[3]			(19,355)	[2],[4]	195,244	[4]
Total income	65,556	[3]			15,531	[2],[4]	196,761	[4]
Elimination of intersegment amounts [member] | Intersegment Income [Member]
Income
Interest income	(142,669)	[3]			(305,600)	[2],[4]	(3,562)	[4]
Commission and fee income	(28,696)	[3]			(22,853)	[2],[4]	(22,902)	[4]
Participation in profit or loss associates and joint business	(176,252)	[3]			(231,568)	[2],[4]	(248,809)	[4]
Dividends	(17,819)	[3]			(46,573)	[2],[4]	(58,221)	[4]
Other Income	(102,035)	[3]			(1,981,929)	[2],[4]	(285,660)	[4]
Total income	$ (467,471)	[3]			$ (2,588,523)	[2],[4]	$ (619,154)	[4]
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Includes Ps. 2,208,053 of income resulting from the desconsolidation of Corficolombiana.
[3]	Includes Grupo Aval, Grupo Aval Limited, Grupo Aval International Limited and ATH negocio conjunto.
[4]	Includes Grupo Aval, Grupo Aval Limited and Grupo Aval International Limited.

ANALYSIS OF OPERATING SEGMEN233

ANALYSIS OF OPERATING SEGMENTS (Details 1) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	$ 26,624,025	$ 25,937,238	$ 21,147,421
Colombia [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	18,789,167	18,548,030	15,749,556
Panama [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	1,410,766	1,333,843	1,293,132
Costa Rica [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	2,752,109	2,598,446	1,778,560
Guatemala [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	1,132,646	1,084,436	1,027,948
Other countries [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Revenue	$ 2,539,337	$ 2,372,483	$ 1,298,225

ANALYSIS OF OPERATING SEGMEN234

ANALYSIS OF OPERATING SEGMENTS (Details 2) $ in Millions, $ in Millions		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		$ 6,654,006	$ 2,230		$ 6,559,515	$ 6,514,048
Intangible assets		848,681			735,043
Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	10,863,904			10,365,292
Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net	[3]	5,799,997			5,899,249	$ 5,732,230
Colombia [Member] | Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	5,868,867			5,496,699
Colombia [Member] | Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		4,635,899			4,702,347
Panama [Member] | Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	3,657,236			3,681,756
Panama [Member] | Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		203,824			208,727
Costa Rica [Member] | Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	89,343			113,009
Costa Rica [Member] | Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		366,800			376,984
Guatemala [Member] | Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	16,714			14,110
Guatemala [Member] | Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		98,778			97,798
Other countries [Member] | Intangible assets [member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Intangible assets	[2]	1,231,744			1,059,718
Other countries [Member] | Property, plant ana equipment for own use [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Own - use Property, plant and equipment, net		$ 494,696			$ 513,393
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	see notes 16 to 18.
[3]	Only includes assets for own use diferent than assets given in operating lease (see note 15.2)

ANALYSIS OF OPERATING SEGMEN235

ANALYSIS OF OPERATING SEGMENTS (Details Textual) - COP ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Analysis Of Operating Segment [Line Items]
Income from deconsolidation	[1]		$ 2,208,053
Customer risk [Member]
Disclosure Of Analysis Of Operating Segment [Line Items]
Description of exposure to risk		no concentration of revenue in customers with more than a 10% share of revenue from ordinary activities.	no concentration of revenue in customers with more than a 10% share of revenue from ordinary activities.	no concentration of revenue in customers with more than a 10% share of revenue from ordinary activities.
[1]	see notes 16 to 18.

OFFSET OF FINANCIAL ASSETS W236

OFFSET OF FINANCIAL ASSETS WITH FINANCIAL LIABILITIES (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Offset Of Financial Assets With Financial Liabilites [Line Items]
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	$ 3,070,824	$ 1,576,410
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	(142,495)	(233,772)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	2,928,329	1,342,638
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial assets	(2,547,432)	(675,918)
Cash collateral received subject to enforceable master netting arrangement or similar agreement not set off against financial assets	(45,387)	(40,241)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	335,510	626,479
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	3,978,057	6,399,628
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	(134,397)	(258,127)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	3,843,660	6,141,501
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	(3,724,677)	(5,315,135)
Cash collateral pledged subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	(33,182)	(90,228)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	85,801	736,138
Derivatives [member]
Disclosure of Offset Of Financial Assets With Financial Liabilites [Line Items]
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	526,148	864,460
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	(142,495)	(233,772)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	383,653	630,688
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial assets	(2,756)	(4,890)
Cash collateral received subject to enforceable master netting arrangement or similar agreement not set off against financial assets	(45,387)	(40,241)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	335,510	585,557
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	446,526	942,258
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	(134,397)	(258,127)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	312,129	684,131
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	(2,831)	(51,030)
Cash collateral pledged subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	(33,182)	(90,228)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	276,116	542,873
Repurchase Agreements [Member]
Disclosure of Offset Of Financial Assets With Financial Liabilites [Line Items]
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	2,544,676	711,950
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	0	0
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	2,544,676	711,950
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial assets	(2,544,676)	(671,028)
Cash collateral received subject to enforceable master netting arrangement or similar agreement not set off against financial assets	0	0
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements	0	40,922
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	3,531,531	5,457,370
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	0	0
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position	3,531,531	5,457,370
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	(3,721,846)	(5,264,105)
Cash collateral pledged subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities	0	0
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	$ (190,315)	$ 193,265

UNCONSOLIDATED STRUCTURED EN237

UNCONSOLIDATED STRUCTURED ENTITIES (Details) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of unconsolidated structured entities [line items]
Other account receivables	$ 224,340	$ 178,785
Grupo Aval [Member]
Disclosure of unconsolidated structured entities [line items]
Investments at fair value through profit or loss	3,050,101	2,746,594
Other account receivables	37,606	45,489
Total assets in relation to the Grupo Aval’s interests in the unconsolidated structured entities	3,087,707	2,792,083
Grupo Aval’s maximum exposure	3,087,707	2,792,083
Securitizations [Member] | Grupo Aval [Member]
Disclosure of unconsolidated structured entities [line items]
Investments at fair value through profit or loss	19,602	27,377
Other account receivables	0	0
Total assets in relation to the Grupo Aval’s interests in the unconsolidated structured entities	19,602	27,377
Grupo Aval’s maximum exposure	19,602	27,377
Managed funds [Member] | Grupo Aval [Member]
Disclosure of unconsolidated structured entities [line items]
Investments at fair value through profit or loss	3,030,499	2,719,217
Other account receivables	37,606	45,489
Total assets in relation to the Grupo Aval’s interests in the unconsolidated structured entities	3,068,105	2,764,706
Grupo Aval’s maximum exposure	$ 3,068,105	$ 2,764,706

TRANSFERS OF FINANCIAL ASSET238

TRANSFERS OF FINANCIAL ASSETS (Details) $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)	Dec. 31, 2017USD ($)
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets		$ 4,799,696			$ 4,091,516		$ 1,608.4
Income for commission and fees		5,202,125	$ 1,743.3		4,879,187	$ 4,284,233
Securitisations [member]
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets	[2]	19,602			27,377	38,975
Income for commission and fees		$ 136			$ 96	$ 359
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.
[2]	Includes investments held for trading through profit or loss and available-for-sale investments.

TRANSFERS OF FINANCIAL ASSET239

TRANSFERS OF FINANCIAL ASSETS (Details Textual) - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	$ 843,075	$ 629,121
Pledged in money market operations [Member]
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	813,783	629,121
Debt securities available for sale [Member] | Pledged in money market operations [Member]
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	2,878,772	4,634,984
Trading debt securities [Member] | Pledged in money market operations [Member]
Disclosure Of Transfers Of Financial Assets [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	$ 843,075	$ 629,121

RELATED PARTIES (Details)

RELATED PARTIES (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)	[1]	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Assets
Cash and equivalents	$ 22,336,838	$ 7,485.5		$ 22,193,004	$ 7,437.3		$ 22,284,977	$ 17,269,760
Other assets	519,771	174.2		589,415
Liabilities
Deposits	154,885,224	51,905.2		143,887,055
Financial obligations	45,276,036	15,172.9		45,516,281
Other liabilities	6,235,466	$ 2,089.6		5,957,192
Sarmiento Angulo and relatives [Member]
Assets
Cash and equivalents	0			0
Financial assets in investments	0			0
Financial assets in credit operations	3,066			3,897
Accounts receivable	11			3
Other assets	0			0
Liabilities
Deposits	21,257			100,787
Accounts payable	103			73
Financial obligations	4			3
Other liabilities	0			0
Key management personnel of entity or parent [member]
Assets
Cash and equivalents	0			0
Financial assets in investments	0			0
Financial assets in credit operations	10,665			9,520
Accounts receivable	33			28
Other assets	0			1
Liabilities
Deposits	20,192			39,431
Accounts payable	700			582
Financial obligations	10			308
Other liabilities	4			0
Associates [member]
Assets
Cash and equivalents	11
Financial assets in investments	910,310			157,427
Financial assets in credit operations	1,492,067			1,809,972
Accounts receivable	59,588			157,725
Other assets	156,636			41,168
Liabilities
Deposits	2,535,339			2,610,620
Accounts payable	15,353			16,215
Financial obligations	16,435			9,445
Other liabilities	7,424			1,984
Entities controlled by individuals [Member]
Assets
Cash and equivalents	0			0
Financial assets in investments	1,249			0
Financial assets in credit operations	1,301,697			1,276,534
Accounts receivable	4,421			8,781
Other assets	3,661			30,068
Liabilities
Deposits	1,566,160			446,802
Accounts payable	322,275			641,363
Financial obligations	1,249			0
Other liabilities	49			3,982
Entities with joint control or significant influence over entity [member]
Assets
Cash and equivalents	67			0
Financial assets in investments	0			0
Financial assets in credit operations	3,385			24,695
Accounts receivable	0			125,532
Other assets	18			0
Liabilities
Deposits	1,275			588
Accounts payable	18,671			37,831
Financial obligations	0			0
Other liabilities	$ 0			$ 0
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RELATED PARTIES (Details 1)

RELATED PARTIES (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Income
Interest income	$ 18,741,833	$ 6,280.7		$ 17,546,970	$ 14,075,598
Fee income and commissions	5,202,125	1,743.3		4,879,187	4,284,233
Other income	1,908,768	639.7		2,605,401	2,389,296
Expenses
Fee expenses and commissions	623,114	208.8		619,528	621,946
Other expenses	8,828,836	$ 2,958.7		8,519,773	7,609,115
Sarmiento Angulo and relatives [Member]
Income
Interest income	164			28	84
Fee income and commissions	5			4	3
Leases	0			0	0
Other income	4			440	2
Expenses
Financial expenses	243			84	163
Fee expenses and commissions	4			333	2
Operating expenses	0			0	0
Other expenses	0			11	5
Entities controlled by individuals [Member]
Income
Interest income	123,671			64,299	23,506
Fee income and commissions	57,180			33,659	26,775
Leases	301			290	262
Other income	6,391			2,957	2,423
Expenses
Financial expenses	30,431			19,064	18,001
Fee expenses and commissions	3,276			2,674	1,227
Operating expenses	1,892			2,060	1,963
Other expenses	34,400			15,159	27,916
Key management personnel of entity or parent [member]
Income
Interest income	757			321	379
Fee income and commissions	48			28	28
Leases	0			0	0
Other income	59			0	80
Expenses
Financial expenses	1,197			656	209
Fee expenses and commissions	1,510			931	1,327
Operating expenses	9,706			5,588	8,288
Other expenses	1,635			1,390	154
Associates [member]
Income
Interest income	155,690			81,646	66,562
Fee income and commissions	26,249			12,717	6,471
Leases	321			66	278
Other income	236,871			171,405	190,571
Expenses
Financial expenses	129,335			88,800	324
Fee expenses and commissions	24,039			15,451	13,597
Operating expenses	3,572			75	114
Other expenses	32,691			193,762	71,759
Entities with joint control or significant influence over entity [member]
Income
Interest income	543			789	1,122
Fee income and commissions	0			0	0
Leases	0			30	19
Other income	0			9,915	5,786
Expenses
Financial expenses	6			0	0
Fee expenses and commissions	1			143	8
Operating expenses	113			1	0
Other expenses	$ 0			$ 811	$ 60
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

RELATED PARTIES (Details 2)

RELATED PARTIES (Details 2) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Related Party [Line Items]
Salaries	$ 17,073	$ 15,731	$ 14,271
Short term benefits for employees	3,167	10,664	12,282
Total	$ 20,240	$ 26,395	$ 26,553

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2018COP ($)$ / sharesshares	Mar. 31, 2018COP ($)$ / sharesshares	Dec. 31, 2017shares	Jun. 30, 2016shares	Dec. 31, 2015shares
Disclosure of subsequents events [Line Items]
Net income for period ended December 31, 2017 included in the unconsolidated financial statements of Grupo Aval	$ 2,001,178
Occasional reserve release at the disposal of the General Meeting of Shareholders	5,333,761
Total Income available for disposal of the General Meeting of Shareholders	$ 7,334,939
Number Of Shares Outstanding | shares	22,281,017,159	22,281,017,159	22,281,017,159	22,281,017,159	22,281,017,159
Total dividends declared	$ 1,069,489	$ 1,069,489
To Occasional reserve at the disposal of General Meeting of Shareholders	$ 6,265,450
Subsequent events [Member]
Disclosure of subsequents events [Line Items]
Dividends Paid On Monthly Basis Ordinary Shares Per Share | (per share)	$ 4	$ 4
Common shares [member]
Disclosure of subsequents events [Line Items]
Number Of Shares Outstanding | shares	15,170,666,914	15,170,666,914	15,240,124,702	15,258,916,143	15,265,983,336
Preference shares [member]
Disclosure of subsequents events [Line Items]
Number Of Shares Outstanding | shares	7,110,350,245	7,110,350,245	7,040,892,457	7,022,101,016	7,015,033,823

SUBSEQUENT EVENTS (Details Text

SUBSEQUENT EVENTS (Details Textual) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2018COP ($)$ / shares	Mar. 31, 2018COP ($)$ / shares	Dec. 31, 2017
Disclosure of subsequents events [Line Items]
Dividend payables | $	$ 1,069,489	$ 1,069,489
Estudios y Proyectos del Sol S.A.S. [Member] | Coninvial [Member]
Disclosure of subsequents events [Line Items]
Proportion Of Ownership Interest In Other Entities			60.00%
Subsequent events [Member]
Disclosure of subsequents events [Line Items]
Dividends paid on monthly basis, ordinary shares per share | (per share)	$ 4	$ 4
Common Stock, Dividends, Per Share, Cash Paid | $ / shares		$ 48
Corficolombiana S.A [Member] | Coviandes [Member]
Disclosure of subsequents events [Line Items]
Proportion Of Ownership Interest In Other Entities			59.77%
Corficolombiana S.A [Member] | Estudios y Proyectos del Sol S.A.S. [Member]
Disclosure of subsequents events [Line Items]
Proportion Of Ownership Interest In Other Entities			100.00%

PARENT COMPANY INFORMATION (Det

PARENT COMPANY INFORMATION (Details) $ in Millions, $ in Millions	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2016USD ($)	[1]	Dec. 31, 2015COP ($)	Dec. 31, 2014COP ($)
Current Assets
Cash and cash equivalents	$ 22,336,838	$ 7,485.5		$ 22,193,004	$ 7,437.3		$ 22,284,977	$ 17,269,760
Accounts receivable from related parties	114,513			230,950
Non-current Assets
Investments in subsidiaries	18,589,623			17,529,893
Property plant and equipment	6,654,006	2,230		6,559,515			6,514,048
Total assets	236,538,540	79,268.9		224,073,721
Long-term liabilities
Deferred tax liabilities	1,696,843	568.6		1,246,809
Total liabilities	210,667,313	70,598.8		199,414,499
Equity
Shareholders’ equity	25,871,227	8,670.1		24,659,222			22,906,280	21,355,964
Total liabilities and shareholders’ equity	236,538,540	$ 79,268.9		224,073,721
Parent [Member]
Current Assets
Cash and cash equivalents	35,478			47,280			$ 12,164	$ 42,459
Held for trading securities	453			4,980
Accounts receivable from related parties	274,323			260,445
Other assets	513			17,759
Total current assets	310,767			330,464
Non-current Assets
Investments in subsidiaries	18,589,623			17,529,893
Property plant and equipment	2,851			3,170
Total non-current assets	18,592,474			17,533,063
Total assets	18,903,241			17,863,527
Current liabilities
Borrowings at amortized cost	290,101			370,349
Outstanding bonds at amortized cost	5,725			6,701
Accounts payable	440,318			430,279
Other non-financial liabilities	1,233			1,234
Total current liabilities	737,377			808,563
Long-term liabilities
Borrowings at amortized cost	253,503			365,605
Outstanding bonds	1,104,080			704,080
Deferred tax liabilities	33			0
Total non-current liabilities	1,357,616			1,069,685
Total liabilities	2,094,993			1,878,248
Equity
Shareholders’ equity	16,808,248			15,985,279
Total liabilities and shareholders’ equity	$ 18,903,241			$ 17,863,527
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

PARENT COMPANY INFORMATION (246

PARENT COMPANY INFORMATION (Details 1) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Operating revenue
Equity method income, net	$ 171,964			$ 140,765	$ 230,398
Other revenue from ordinary activities	439,579			750,648	723,361
Expenses, net
Administrative expenses	4,513,148			4,409,199	3,878,786
Other expenses	8,828,836	$ 2,958.7		8,519,773	7,609,115
Net income before taxes	4,915,227	1,647.2		5,573,845	5,224,656
Income tax expense	1,752,794	587.4		2,056,909	1,878,970
Net income	3,162,433	$ 1,059.8		3,516,936	3,345,686
Parent [Member]
Operating revenue
Equity method income, net	2,005,155			2,330,814	2,331,965
Other revenue from ordinary activities	234,502			77,387	75,262
Total operating revenue	2,239,657			2,408,201	2,407,227
Expenses, net
Administrative expenses	89,823			98,130	79,908
Other expenses	274			168	337
Gains (losses) from exchange differences	98			(1,085)	(29,760)
Operating income	2,149,658			2,308,818	2,297,222
Financial expenses	133,171			125,585	68,512
Net income before taxes	2,016,487			2,183,233	2,228,710
Income tax expense	51,568			5,620	6,571
Net income	$ 1,964,919			$ 2,177,613	$ 2,222,139
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

PARENT COMPANY INFORMATION (247

PARENT COMPANY INFORMATION (Details 2) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017COP ($)	Dec. 31, 2017USD ($)	[1]	Dec. 31, 2016COP ($)	Dec. 31, 2015COP ($)
Disclosure Of parent company information [Line Items]
Net income	$ 3,162,433	$ 1,059.8		$ 3,516,936	$ 3,345,686
Net cash provided (used in) by investing activities	(3,610,068)	(1,210)		(952,870)	(6,746,107)
Net cash (used in) provided by financing activities	(1,445,976)	(484.6)		66,863	(2,807,201)
Increase (decrease) in cash and cash equivalents	143,834	48.2		(91,973)	5,015,217
Cash and cash equivalents at beginning of year	22,193,004	7,437.3		22,284,977	17,269,760
Cash and cash equivalents at end of year	22,336,838	$ 7,485.5		22,193,004	22,284,977
Parent [Member]
Disclosure Of parent company information [Line Items]
Net income	1,964,919			2,177,613	2,222,139
Adjustments to reconcile net income to net cash used by operating activities	(867,042)			(1,726,296)	(1,470,593)
Net cash provided by operating activities	1,097,877			451,317	751,546
Net cash provided (used in) by investing activities	(8,830)			(55,374)	192,801
Net cash (used in) provided by financing activities	(1,100,849)			(360,827)	(974,642)
Increase (decrease) in cash and cash equivalents	(11,802)			35,116	(30,295)
Cash and cash equivalents at beginning of year	47,280			12,164	42,459
Cash and cash equivalents at end of year	$ 35,478			$ 47,280	$ 12,164
[1]	2.4 Convenience translation in to U.S. dollars: The presentation currency of Grupo Aval´s consolidated financial statements is the Colombian Peso. The U.S. dollar amounts disclosed in the accompanying consolidated financial statements are presented solely for the convenience of the reader, dividing the Colombian peso amounts by the exchange rate of Ps. 2,984.00 per US$1.00, which is the market exchange rate at December 31, 2017, as calculated by the Central Bank of Colombia. The use of this methodology in translating Colombian pesos into U.S. dollars is referred to as the “U.S. dollar translation methodology,” and should not be construed as a representation that the Colombian peso amounts actually represent or have been, or the amount that could be converted into U.S. dollars at that rate or any other rate.

PARENT COMPANY INFORMATION (248

PARENT COMPANY INFORMATION (Details 3) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of parent company information [Line Items]
Investments in subsidiaries	$ 18,589,623	$ 17,529,893
Banco de Bogota S.A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	68.74%	68.74%
Investments in subsidiaries	$ 11,000,669	$ 10,331,548
Banco de Occidente S.A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	72.27%	72.27%
Investments in subsidiaries	$ 3,174,228	$ 3,089,717
Banco Comercial AV Villas S. A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	79.87%	79.87%
Investments in subsidiaries	$ 1,190,740	$ 1,139,881
Banco Popular S. A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	93.74%	93.74%
Investments in subsidiaries	$ 2,710,218	$ 2,624,196
Corporacion Financiera Colombiana S.A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	44.79%	44.49%
Investments in subsidiaries	$ 504,962	$ 472,466
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A. [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	75.69%	75.69%
Investments in subsidiaries	$ 401,341	$ 341,112
Grupo Aval Limited [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	100.00%	100.00%
Investments in subsidiaries	$ (315,227)	$ (316,553)
Grupo Aval International Limited [Member]
Disclosure Of parent company information [Line Items]
Proportion of voting rights held in subsidiary	100.00%	100.00%
Investments in subsidiaries	$ (77,308)	$ (152,474)

PARENT COMPANY INFORMATION (249

PARENT COMPANY INFORMATION (Details 4) - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 31,835,928	$ 26,373,860
Parent [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	1,104,080
Outstanding bonds, Amount	1,104,080	704,080
Parent [Member] | Issuance date One [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 100,000
Outstanding bonds, Maturity	June, 2020
Outstanding bonds, Coupon rate	IPC + 2.69%
Outstanding bonds, Amount	$ 100,000	0
Parent [Member] | Issuance date Two [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 300,000
Outstanding bonds, Maturity	June, 2042
Outstanding bonds, Coupon rate	IPC + 3.99%
Outstanding bonds, Amount	$ 300,000	0
Parent [Member] | Issuance date Three [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 93,000
Outstanding bonds, Maturity	November, 2026
Outstanding bonds, Coupon rate	IPC + 3.86%
Outstanding bonds, Amount	$ 93,000	93,000
Parent [Member] | Issuance date Four [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 207,000
Outstanding bonds, Maturity	November, 2036
Outstanding bonds, Coupon rate	IPC + 4.15%
Outstanding bonds, Amount	$ 207,000	207,000
Parent [Member] | Issuance date Five [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 279,560
Outstanding bonds, Maturity	December, 2019
Outstanding bonds, Coupon rate	IPC + 4.84%
Outstanding bonds, Amount	$ 279,560	279,560
Parent [Member] | Issuance date Six [Member]
Disclosure Of parent company information [Line Items]
Outstanding bonds, Tranches	$ 124,520
Outstanding bonds, Maturity	December, 2024
Outstanding bonds, Coupon rate	IPC + 5.20%
Outstanding bonds, Amount	$ 124,520	$ 124,520

PARENT COMPANY INFORMATION (250

PARENT COMPANY INFORMATION (Details 5) - Parent [Member] - COP ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of parent company information [Line Items]
Scheduled Maturities of Bonds	$ 1,104,080	$ 704,080
Twenty Nineteen [Member]
Disclosure Of parent company information [Line Items]
Scheduled Maturities of Bonds	279,560
Twenty Twenty And Thereafter [Member]
Disclosure Of parent company information [Line Items]
Scheduled Maturities of Bonds	$ 824,520