Enel Chile (ENIC) 20-F/A 25 May 18 2017 FY Annual report (foreign) (amended) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017shares
Documentand Entity Information [Abstract]
Document Type	20-F/A
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	ENIC
Entity Registrant Name	ENEL CHILE S.A.
Entity Central Index Key	1,659,939
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	49,092,772,762

Consolidated Statements of Fina

Consolidated Statements of Financial Position - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 419,456,026	$ 245,999,192
Other current financial assets	20,627,062	584,244
Other current non-financial assets	6,002,142	15,831,486
Trade and other current receivables	419,752,286	445,071,856
Current accounts receivable from related parties	71,856,046	52,858,384
Inventories	39,686,942	37,539,596
Current tax assets	77,756,048	55,649,171
Total current assets other than assets or disposal groups held for sale	1,055,136,552	853,533,929
Non-current assets or disposal groups held for sale	4,205,233	12,993,008
TOTAL CURRENT ASSETS	1,059,341,785	866,526,937
NON-CURRENT ASSETS
Other non-current financial assets	33,418,204	28,827,542
Other non-current non-financial assets	13,813,139	13,336,152
Trade and other non-current receivables	36,182,399	33,500,105
Investments accounted for using the equity method	12,707,221	18,738,198
Intangible assets other than goodwill	55,170,904	44,470,750
Goodwill	887,257,655	887,257,655
Property, plant and equipment	3,585,687,137	3,476,128,634
Investment property	8,356,772	8,128,522
Deferred tax assets	2,837,792	21,796,517
TOTAL NON-CURRENT ASSETS	4,635,431,223	4,532,184,075
TOTAL ASSETS	5,694,773,008	5,398,711,012
CURRENT LIABILITIES
Other current financial liabilities	18,815,448	25,696,166
Trade and other current payables	594,498,606	561,505,283
Current accounts payable to related parties	119,612,972	90,428,929
Other current provisions	5,636,171	6,493,532
Current tax liabilities	67,027,507	61,599,415
Other current non-financial liabilities	11,225,942	11,523,322
TOTAL CURRENT LIABILITIES	816,816,646	757,246,647
NON-CURRENT LIABILITIES
Other non-current financial liabilities	781,978,145	854,016,751
Trade and other non-current payables	659,824	1,483,113
Non-current accounts payable to related parties	318,518	251,527
Other long-term provisions	78,422,837	63,106,908
Deferred tax liabilities	172,223,681	199,364,794
Non-current provisions for employee benefits	57,081,924	59,934,127
Other non-current non-financial liabilities	309,776	313,503
TOTAL NON-CURRENT LIABILITIES	1,090,994,705	1,178,470,723
TOTAL LIABILITIES	1,907,811,351	1,935,717,370
EQUITY
Allocated capital	2,229,108,975	2,229,108,975
Retained earnings	1,751,605,583	1,569,375,291
Other reserves	(997,330,548)	(1,035,092,978)
Equity attributable to Enel Chile	2,983,384,010	2,763,391,288
Non-controlling interests	803,577,647	699,602,354
TOTAL EQUITY	3,786,961,657	3,462,993,642
TOTAL LIABILITIES AND EQUITY	$ 5,694,773,008	$ 5,398,711,012

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income, by Nature - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 2,490,470,178	$ 2,515,843,880	$ 2,384,293,189
Other operating income	38,876,700	25,722,939	14,735,951
Revenues and other operating income	2,529,346,878	2,541,566,819	2,399,029,140
Raw materials and consumables used	(1,521,155,517)	(1,497,419,580)	(1,481,985,559)
Contribution Margin	1,008,191,361	1,044,147,239	917,043,581
Other work performed by the entity and capitalized	14,388,987	16,096,852	21,004,053
Employee benefits expense	(121,503,777)	(124,098,428)	(136,554,721)
Depreciation and amortization expense	(152,684,106)	(161,660,610)	(153,201,662)
Impairment loss recognized in the period’s profit or loss	(7,937,817)	(35,926,710)	3,054,903
Other expenses	(161,824,074)	(170,769,137)	(125,857,397)
Operating Income	578,630,574	567,789,206	525,488,757
Other gains	113,241,196	121,490,062	20,055,745
Financial income	21,662,688	23,105,901	15,270,169
Financial costs	(53,510,882)	(58,199,382)	(66,700,698)
Share of profit (loss) of associates and joint ventures accounted for using the equity method	(2,696,904)	7,878,200	8,905,045
Foreign currency exchange differences	8,516,874	12,978,471	(51,277,332)
Gains from indexed assets and liabilities	916,666	1,631,840	4,839,077
Income before taxes	666,760,212	676,674,298	456,580,763
Income tax expense, continuing operations	(143,342,301)	(111,403,182)	(109,612,599)
NET INCOME	523,417,911	565,271,116	346,968,164
Net income attributable to:
Equity owners of Enel Chile	349,382,642	384,159,865	251,838,410
Non-controlling interests	174,035,269	181,111,251	95,129,754
NET INCOME	$ 523,417,911	$ 565,271,116	$ 346,968,164
Basic earnings per share
Basic earnings continuing operations	$ 7.12	$ 7.83	$ 5.13
Basic earnings per share	$ 7.12	$ 7.83	$ 5.13
Weighted average number of shares of common stock	49,092,772,762	49,092,772,762	49,092,772,762
Diluted earnings per share
Diluted earnings continuing operations	$ 7.12	$ 7.83	$ 5.13
Diluted earnings per share	$ 7.12	$ 7.83	$ 5.13
Weighted average number of shares of common stock	49,092,772,762	49,092,772,762	49,092,772,762
Net Income	$ 523,417,911	$ 565,271,116	$ 346,968,164
Components of other comprehensive income that will not be reclassified subsequently to profit or loss, before taxes
Remeasurement losses from defined benefit plans	1,716,875	(6,618,514)	(5,645,532)
Other comprehensive loss that will not be reclassified subsequently to profit or loss	1,716,875	(6,618,514)	(5,645,532)
Components of other comprehensive income (loss) that will be reclassified subsequently to profit or loss, before taxes
Foreign currency translation gains	(3,686,549)	(3,532,410)	162,373
Gains (losses) from available-for-sale financial assets	1,840	(6,740)	1,077
Share of other comprehensive income (loss) from associates and joint ventures accounted for using the equity method	(1,490)	(11,691,509)	(577,862)
Gains (losses) from cash flow hedges	73,333,487	68,850,275	(137,733,945)
Adjustments from reclassification of cash flow hedges, transferred to profit or loss	24,225,474	20,218,082	15,140,369
Other comprehensive income (loss) that will be reclassified subsequently to profit or loss	93,872,762	73,837,698	(123,007,988)
Other comprehensive income (loss), before taxes	95,589,637	67,219,184	(128,653,520)
Income tax related to components of other comprehensive income that will not be reclassified subsequently to profit or loss
Income tax related to defined benefit plans	(463,556)	1,786,999	1,325,242
Income tax related to components of other comprehensive income that will not be reclassified subsequently to profit or loss	(463,556)	1,786,999	1,325,242
Income tax related to components of other comprehensive income that will be reclassified subsequently to profit or loss
Income tax related to cash flow hedge	(25,701,599)	(21,116,232)	31,868,299
Income tax related to available-for-sale financial assets	(497)	1,820	(290)
Income tax related to components of other comprehensive income that will be reclassified subsequently to profit or loss	(25,702,096)	(21,114,412)	31,868,009
Total Other Comprehensive Income (Loss)	69,423,985	47,891,771	(95,460,269)
TOTAL COMPREHENSIVE INCOME	592,841,896	613,162,887	251,507,895
Comprehensive income attributable to:
Equity owners of Enel Chile	391,680,966	411,551,269	193,709,073
Non-controlling interests	$ 201,160,930	$ 201,611,618	$ 57,798,822

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - CLP ($) $ in Thousands	Total	Allocated Capital [Member]	Reserve for Exchange Differences in Translation [Member]	Reserve for Cash Flow Hedges [Member]	Reserve for Gains and Losses for Defined Benefit Plans [Member]	Reserve of Gains and Losses on Remeasuring Available-for-Sale Financial Assets [Member]	Amounts Recognized in Other Comprehensive Income and Accumulated in Equity Related to Non-current Assets or Groups of Assets for Disposal Classified as Held for Sale [Member]	Other Miscellaneous Reserves [Member]	Other Reserves [Member]	Retained Earnings [Member]	Equity Attributable to Owners of Parent [Member]	Non-controlling Interests [Member]
Equity beginning balance at Dec. 31, 2014	$ 3,084,065,791	$ 2,229,108,975	$ 11,443,966	$ (66,850,863)		$ 14,046		$ (873,486,367)	$ (928,879,218)	$ 1,171,971,677	$ 2,472,201,434	$ 611,864,357
Comprehensive income
Profit (loss)	346,968,164									251,838,410	251,838,410	95,129,754
Other comprehensive income	(95,460,269)		979,726	(54,652,189)	$ (4,111,061)	789		(346,602)	(58,129,337)		(58,129,337)	(37,330,932)
TOTAL COMPREHENSIVE INCOME	251,507,895										193,709,073	57,798,822
Dividends	(133,813,131)									(93,477,653)	(93,477,653)	(40,335,478)
Increase (decrease) from other changes	140,228				4,111,061			24,307,542	28,418,603	(8,169,955)	20,248,648	(20,108,420)
Total changes in equity	117,834,992		979,726	(54,652,189)		789		23,960,940	(29,710,734)	150,190,802	120,480,068	(2,645,076)
Equity ending balance at Dec. 31, 2015	3,201,900,783	2,229,108,975	12,423,692	(121,503,052)		14,835		(849,525,427)	(958,589,952)	1,322,162,479	2,592,681,502	609,219,281
Comprehensive income
Profit (loss)	565,271,116									384,159,865	384,159,865	181,111,251
Other comprehensive income	47,891,771		(2,137,753)	40,843,826	(4,297,479)	(4,880)		(7,012,310)	27,391,404		27,391,404	20,500,367
TOTAL COMPREHENSIVE INCOME	613,162,887										411,551,269	201,611,618
Dividends	(227,160,166)									(145,636,016)	(145,636,016)	(81,524,150)
Increase (decrease) from other changes	(124,909,862)		(1,063,006)	4,440,756	4,297,479		$ 1,632,724	(113,202,383)	(103,894,430)	8,688,963	(95,205,467)	(29,704,395)
Total changes in equity	261,092,859		(3,200,759)	45,284,582		(4,880)	1,632,724	(120,214,693)	(76,503,026)	247,212,812	170,709,786	90,383,073
Equity ending balance at Dec. 31, 2016	3,462,993,642	2,229,108,975	9,222,933	(76,218,470)		9,955	1,632,724	(969,740,120)	(1,035,092,978)	1,569,375,291	2,763,391,288	699,602,354
Comprehensive income
Profit (loss)	523,417,911									349,382,642	349,382,642	174,035,269
Other comprehensive income	69,423,985		(2,246,550)	43,368,734	1,174,811	1,329			42,298,324		42,298,324	27,125,661
TOTAL COMPREHENSIVE INCOME	592,841,896										391,680,966	201,160,930
Dividends	(263,271,862)									(168,327,161)	(168,327,161)	(94,944,701)
Increase (decrease) from other changes	(5,602,019)				$ (1,174,811)		(1,632,724)	(1,728,359)	(4,535,894)	1,174,811	(3,361,083)	(2,240,936)
Total changes in equity	323,968,015		(2,246,550)	43,368,734		1,329	$ (1,632,724)	(1,728,359)	37,762,430	182,230,292	219,992,722	103,975,293
Equity ending balance at Dec. 31, 2017	$ 3,786,961,657	$ 2,229,108,975	$ 6,976,383	$ (32,849,736)		$ 11,284		$ (971,468,479)	$ (997,330,548)	$ 1,751,605,583	$ 2,983,384,010	$ 803,577,647

Consolidated Statements of Cash

Consolidated Statements of Cash Flows, Direct - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Types of collection from operating activities
Collections from the sale of goods and services	$ 3,147,019,752	$ 3,234,555,814	$ 3,049,501,263
Collections from premiums and services, annual payments, and other obligations from policies held	6,808,382	3,941,414	1,575,093
Other collections from operating activities	15,216,737	3,764,294	4,399,898
Types of payment in cash from operating activities
Payments to suppliers for goods and services	(2,068,346,327)	(2,119,032,266)	(2,069,604,155)
Payments to and on behalf of employees	(128,787,065)	(128,828,942)	(132,245,067)
Payments on premiums and services, annual payments, and other obligations from policies held	(15,466,609)	(17,236,985)	(7,547,854)
Other payments for operating activities	(130,403,003)	(232,754,099)	(123,833,216)
Income taxes paid	(183,022,750)	(125,565,819)	(134,275,698)
Other outflows of cash, net	(7,405,397)	(4,158,555)	(11,438,737)
Net cash flows from operating activities	635,613,720	614,684,856	576,531,527
Cash flows from (used in) investing activities
Cash flows from the loss of control of subsidiaries or other businesses, net		3,003	6,639,653
Other collections from the sale of equity or debt instruments belonging to other entities	115,582,806	134,925,825
Other payments to acquire stakes in joint ventures	(1,943,100)	(2,346,000)	(2,550,000)
Loans to related companies	(161,363,897)	(72,633,744)
Proceeds from the sale of property, plant and equipment	4,428,995	15,272,996	29,853
Purchases of property, plant and equipment	(266,029,921)	(222,385,600)	(309,503,337)
Proceeds from the sale of the other long-term assets			1,729,727
Payments for future, forward, option and swap contracts	(7,808,837)	(8,044,017)	(6,143,222)
Collections from future, forward, option and swap contracts	835,105	3,744,080	186,522
Collections from related companies	161,363,898	72,855,009
Dividends received	879,884	8,682,136	10,163,153
Interest received	7,589,290	6,437,720	2,706,304
Net cash flows used in investing activities	(146,465,777)	(63,488,592)	(296,741,347)
Cash flows from (used in) financing activities
Total Amounts from long-term loans		136,870,540
Proceeds from long-term loans		136,870,500
Proceeds from short-them loans		40
Loans from related companies	150,000,000	150,517,279	672,906,691
Payments of loans	(5,534,483)
Payments on borrowings and financial lease liabilities	(2,592,237)	(139,596,278)	(142,318,377)
Payment of loans to related companies	(150,000,000)	(167,561,709)	(633,103,315)
Dividends paid	(260,803,055)	(322,805,225)	(134,692,408)
Interest paid	(43,816,959)	(48,344,510)	(59,614,618)
Change in parent company investment			28,596,303
Other outflows of cash, net	(4,848,787)	(54,947,069)	(5,216,726)
Net cash flows used in financing activities	(317,595,521)	(445,866,972)	(273,442,450)
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes	171,552,422	105,329,292	6,347,730
Effect of exchange rate changes on cash and cash equivalents
Effect of exchange rate changes on cash and cash equivalents	1,904,412	(3,591,945)	4,898,486
Net increase (decrease) in cash and cash equivalents	173,456,834	101,737,347	11,246,216
Cash and cash equivalents at beginning of year	245,999,192	144,261,845	133,015,629
Cash and cash equivalents at end of year	$ 419,456,026	$ 245,999,192	$ 144,261,845

Background and Business Activit

Background and Business Activities	12 Months Ended
	Dec. 31, 2017
Disclosure Of General Information About Financial Statements [Abstract]
Background and Business Activities	1. BACKGROUND AND BUSINESS ACTIVITIES Enel Chile S.A. (hereinafter the “Parent Company” or the “Company”) and its subsidiaries comprise the Enel Chile Group (hereinafter the “Group”). The Company is a publicly traded corporation with registered address and head office located at Avenida Santa Rosa, No. 76, in Santiago, Chile. Since April 13, 2016, he Company is registered in the securities register of the Financial Market Commission of Chile (“Comisión para el Mercado Financiero” or “CMF”, formerly the Chilean Superintendence of Securities and Insurance, “Superintendencia de Valores y Seguros” or “SVS”) and since March 31, 2016 is registered with the Securities and Exchange Commission of the United States of America. On April 21, 2016, the Company’s shares began trading on the Santiago Stock Exchange, the Electronic Stock Exchange and the Valparaíso Stock Exchange. In addition, the Company’s common stock began trading in the United States in the form of American Depositary Shares on the New York Stock Exchange by way of “when-issued” trading from April 21, 2016 to April 26, 2017 and “regular-way” trading since April 27, 2016. Enel S.p.A. (hereinafter “Enel”), an Italian generation company, is the ultimate controlling shareholder of the Company. The Company was initially incorporated by public deed dated January 22, 2016 and came into legal existence on March 1, 2016 under the name of Enersis Chile S.A. The Company changed its name to Enel Chile S.A. effective October 4, 2016, the date its by-laws were amended in connection with the corporate reorganization of the Group. For tax purposes, the Company operates under Chilean tax identification number 76.536.353-5. As of December 31, 2017, the Group had 1,948 employees. During the fiscal year ended December 31, 2017, the Group averaged a total of 1,993 employees (see Note 34). Enel Chile’s corporate purpose consists of exploring, developing, operating, generating, distributing, transporting, transforming and/or sale of energy in any of its forms or nature, directly or through other entities within Chile. Additionally, it is also engaged in investing and managing its investments in its subsidiaries and associates, whose activities include the generation, transmission, distribution or selling of electrical energy, or whose corporate purpose includes any of the following: i) Energy of any kind or form, ii) Supplying public services, or services whose main component is energy, iii) Telecommunications and information technology services, and iv) Internet-based intermediation business. Corporate Reorganizations a) Separation of businesses in Chile from its business in Argentina, Brazil, Colombia and Peru (the “Spin-Off”): In 2015, Enersis S.A. (“Enersis”), which was ultimately controlled and 60.6% beneficially owned by Enel, initiated a reorganization process to separate its electricity generation and distribution businesses and related assets and liabilities in Chile from its generation, transmission and distribution businesses in Argentina, Brazil, Colombia and Peru (the “Reorganization”). The Reorganization began with the spin-offs by Enersis and its subsidiaries, Empresa Nacional de Electricidad S.A. (“Endesa Chile”) and Chilectra S.A. (“Chilectra”), following the approval of the spin-offs by the respective shareholders of Enersis, Endesa Chile and Chilectra at their extraordinary shareholders’ meetings held on December 18, 2015 Endesa Chile conducted a “ división ” or “demerger” under Chilean corporate law to divide Endesa Chile into two separate companies. The new company, Endesa Américas S.A. (“Endesa Américas”), was assigned Endesa Chile's non-Chilean businesses and related assets and liabilities on March 1, 2016 (the “Separation”). Endesa Américas registered its shares with the Securities Registry of the SVS pursuant to Chilean law and with the U.S. Securities and Exchange Commission (the “SEC”) pursuant to applicable U.S. federal securities laws, and on April 21, 2016, Endesa Chile distributed shares of Endesa Américas to its shareholders in proportion to such shareholders’ share ownership in Endesa Chile based on a ratio of one share of Endesa Américas for each outstanding share of Endesa Chile (the “Distribution,” and together with the Separation, the “Spin-Off”). Following the Spin-Off, Endesa Chile retained its Chilean businesses and related assets and liabilities. Chilectra, a Chilean electricity distribution company and subsidiary of Enersis, also conducted a “ división ” or “demerger” and then distributed to its shareholders pro rata the shares of a new Chilean company, Chilectra Américas S.A. (“Chilectra Américas”), that holds the non-Chilean equity interests and related assets and liabilities, which consists exclusively of Chilectra’s ownership interests in shares of companies domiciled outside of Chile (the “Chilectra Spin-Off” and together with the Spin-Off, the “Endesa/Chilectra Spin-Offs”). Chilectra Américas registered its shares with the Securities Registry of the SVS pursuant to Chilean law and Chilectra continues to hold its Chilean businesses and related assets and liabilities. In connection with the “demergers” of Endesa Chile and Chilectra, Enersis conducted a “ división ” or “demerger”. Following the Endesa/Chilectra Spin-Offs, Enersis distributed to its shareholders pro rata the shares of a new Chilean company, Enersis Chile S.A. (“Enersis Chile”), that was assigned the Chilean businesses and assets, including the equity interests in each of Endesa Chile and Chilectra, after giving effect to the “demergers” of Endesa Chile and Chilectra (the “Enersis Spin-Off”). On March 1, 2016, having satisfied all conditions precedent including the capital decrease and modifications to the by-laws, the Enersis Spin-Off became effective and Enersis S.A.’s corporate name was changed to Enersis Américas S.A. The new entity Enersis Chile was also incorporated on that date and allocated the equity interest and related assets and liabilities of Enersis' businesses in Chile. Enersis Chile registered its shares with the Securities Registry of the SVS pursuant to Chilean law and the SEC pursuant to applicable U.S. federal securities laws in connection with the Enersis Spin-Off, which was completed in April 2016. As part of the Enersis Spin-Off, it was agreed that Enersis’ share capital would be reduced from Ch$5,804,447,986,000 divided into 49,092,772,762 registered common shares of a single series with no par value, to Ch$3,575,339,011,549 divided into 49,092,772,762 registered common shares of a single series with no par value. Additionally, it was agreed that (i) Enersis Chile’s share capital would be Ch$2,229,108,974,451, which corresponds to the amount by which the Enersis share capital would be decreased, divided into 49,092,772,762 registered common shares of a single series with no par value, and (ii) Enersis’ equity interest would be distributed between Enersis Américas and Enersis Chile by allocating assets and liabilities to Enersis Chile, as agreed at the extraordinary shareholders’ meeting held on December 18, 2015 On October 4, 2016, the respective by-laws were amended and the corporate names of Enersis Chile, Endesa Chile and Chilectra were changed to Enel Chile S.A., Enel Generación Chile S.A. and Enel Distribución Chile S.A., respectively. 1.1 Incorporation of Renewable Energy Assets in Chile: Considering the high priority of renewable energy in the Open Power strategy of Enel Chile and with the intention to strengthen this strategy, on August 25, 2017 Enel Chile proposed a corporate regonization (the “Renewable Assets Reorganization”) to consolidate Enel S.p.A.´s renewable Assets Reorganization is intended to incorporate the renewable energy assets in Chile held through Enel Green Power Latin America S.A. (“EGPL”) with Enel Chile, which in turn, holds conventional energy generation assets in Chile through Enel Generación Chile S.A. (“Enel Generación Chile”) and distribution assets in Chile through Enel Distribución Chile. Enel Chile and Enel Generación Chile are both reporting companies under the regulation of the Chilean CMF and have American Depositary Receipts traded on the New York Stock Exchange, therefore are also subject to rules of the United States Securities and Exchange Commission (the “SEC”). EGPL is a wholly owned subsidiary of Enel, held through Enel Green Power S.p.A. (“EGP”). The Renewable Assets Reorganization involves the following transactions, each of which is conditional on the implementation of the other: 1. Public tender offer Enel Chile will make a public tender offer (the “Tender Offer”) for all of the shares (including American Depositary Shares or “ADSs”of its subsidiary Enel Generación Chile S.A. (“Enel Generación Chile”) held by non-controlling interests (equivalent to approximately 40% of the share capital). The Tender Offer consideration will be paid in cash, subject to the condition that tendering Enel Generación Chile shareholders agree to use Ch$236 of the Ch$590 cash tender offer consideration for each Enel Generación Chile share and Ch$$7,080 of the Ch$17,700 cash tender offer consideration for each Enel Generación Chile ADS to subscribe for shares American Depositary Shares (or “ADSs”) of Enel Chile at a subscription price of Ch$82 per Enel Chile share (or Ch$4,100 per Enel Chile ADS) the “Share/ADS Subscription Condition”. The Tender Offer will be accounted for as the acquisition of the non-controlling interests in Enel Generación Chile. The transaction represents a change in Enel Chile’s ownership over Enel Generación Chile without resulting in a loss of control, reason for which it is accounted for as an equity transaction in accordance with IFRS as issued by the IASB. 2. Capital Increase Enel Chile will conduct a capital increase (the “Capital Increase”) in order to have a sufficient number of shares of common stock of Enel Chile available to deliver to tendering holders of Enel Generación Chile shares and ADSs to satisfy the Share/ADS Subscription Condition. In connection with the Capital Increase, in accordance with Chilean law, Enel Chile will make a preemptive rights offering to existing shareholders of Enel Chile who have preemptive rights to subscribe for the additional shares of Enel Chile issued in the Capital Increase pro rata in proportions to their interest in Enel Chile at a subscription price of Ch$82 per Enel Chile share in cash. 3. Merger Following the completion of the Tender Offer, EGPL will merge into Enel Chile (the “Merger”). Consequently, the renewable assets held by EGPL will be consolidated by Enel Chile. Subject to the final share subscription price in the Tender Offer and the exchange ratio in the Merger, Enel is expected to hold, taken together, an ownership interest in Enel Chile similar to its current 60.6% ownership. The Merger will be accounted for as a combination of entities under common control of Enel, similar to a pooling of interests, effected by Enel Chile through issuance of its shares to be delivered to EGP as consideration of the proposed merger of EGPL. As Enel Chile and EGPL are under common control of Enel, no purchase accounting is applied. At the Extraordinary Shareholders’ Meeting of Enel Chile held on December 20, 2017, the Renewable Assets Reorganization was approved, subject to compliance with the conditions stipulated for the Tender Offer, Capital Increase and Merger. In addition, the Shareholders’ Meeting also approved the Capital Increase in Enel Chile of Ch$1,891,727,278,668 through issuance of 23,069,844,862 new registed common shares of a single series with no par value, at a share price and under the conditions approved at the Shareholders’ Meeting. Finally, it the amendments of the articles of incorporation of Enel Chile in order to reflect the Merger-related agreements, Capital Increase and expansion of the corporate purpose of Enel Chile were also approved, among other provisions. The Tender Offer occurred between February 16, 2018 and March 22, 2018, the preemptive right offering in connection with the Capital Increase took place between February 15, 2018 and March 16, 2018 and the Renewable Assets Reorganization (including the Merger) was completed and effective on April 2, 2018.

Basis of Presentation of the Co

Basis of Presentation of the Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2017
Statement Of Compliance And Basis Of Presentation [Abstract]
Basis of Presentation of the Consolidated Financial Statements	2. BASIS OF PRESENTATION OF THE CON 2.1 Basis of preparation The accompanying consolidated financial statements as of December 31, 2017 of Enel Chile approved by the Company’s Board of Directors at its meeting held on April 25, 2018, have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”) . The consolidated financial statements for the periods prior to the Separation reflect the combined operations of the Group as it would have been incorporated following the Spin-Off, assuming date would have been January 1, 2013. The combined financial statements may not be indicative of the Group’s future performance and do not necessarily reflect what the results of operations, financial position and cash flows would have been had it operated, since January 1, 2013 as an independent combined group during the periods presented. For the periods prior to the Separation, the Group does not represent a group for consolidated financial statement reporting purposes in accordance with IFRS 10 Consolidated Financial Statements. Since IFRS does not provide any guidance for the preparation of combined financial statements, paragraph 12 of IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors Following the Separation, the consolidated financial statements include the financial statements of the Company and its subsidiaries, associates and joint ventures, and no longer include any allocations of expenses from Enersis S.A. to the Company. Accordingly: • The consolidated statement of financial position as of December 31, 2017 and 2016, consists of the consolidated statement of financial position of the Group. • The consolidated statement of comprehensive income for the year ended December 31, 2017, consists of the consolidated statement of comprehensive income of the Group. The consolidated statement of comprehensive income for the year ended December 31, 2016, consists of the consolidated statement of comprehensive income of the Group for the ten month period ended December 31, 2016 and the combined statement of comprehensive income of the Company’s businesses aggregated as a combined group for the two month period ended March 1, 2016. The combined statements of comprehensive income for the year ended December 31, 2015, consist of the combined statements of comprehensive income of the Company’s businesses aggregated as a combined group. • The consolidated statement of changes in equity for the year ended December 31, 2017, consists of the consolidated statement of changes in equity of the Group. The consolidated statement of changes in equity for the year ended December 31, 2016, consists of the consolidated statement of changes in equity of the Group for the ten month period ended December 31, 2016 and the combined statement of changes in equity of the Company’s businesses aggregated as a combined group for the two month period ended March 1, 2016 The combined statements of changes in equity for the year ended December 31, 2015, consist of the combined statements of changes in equity of the Company’s businesses aggregated as a combined group. • The consolidated statement of cash flows for the year ended December 31, 2017, consists of the consolidated statement of cash flows of the Group. The consolidated statement of cash flows for the year ended December 31, 2016, consists of the consolidated statement of cash flows of the Group for the ten month period ended December 31, 2016 and the combined statement of cash flows of the Company’s businesses aggregated as a combined group for the two month period ended March 1, 2016 The combined statements of cash flows for the year ended December 31, 2015, consist of the combined statements of cash flows of the Company’s businesses aggregated as a combined group. These consolidated financial statements are presented in thousands of Chilean pesos (unless otherwise stated) which is the Company’s functional and presentation currency. Principles applied in preparing the Combined Financial Statements The following summarizes the accounting and other principles applied in preparing the combined financial statements. Management considers that the allocations described below were made on a reasonable basis, but are not necessarily indicative of the costs that would have been incurred if the Company aggregated as a combined group (hereinafter “the Combined Group”) had been a stand-alone entity. Net assets of the Parent (equity) Prior to the Separation, the Combined Group had not previously formed a separate legal group nor presented any stand-alone financial statements, and accordingly it was not conceivable to present share capital or an analysis of equity reserves. The net assets of the Combined Group were represented by capital invested in the Combined Group and were shown as “Equity” using the same captions as those used by Enersis. Issued capital, share premium and retained earnings of Enersis were allocated to Enersis Chile based on net assets value ratio assigned to it. Other reserves (which were primarily composed of the equity effects of past reorganizations, business combinations under common control, residual effects of first-time adoption of IFRS and the equity effects of the recent Spin-Off) were allocated considering the transaction and circumstances that led to creation of these reserves. Cash and cash equivalents Cash and cash equivalents of the foreign subsidiaries of Enersis were excluded from the combined financial statements. In addition, the cash and cash equivalents balance of Enersis, on a stand-alone basis, was allocated using the following criteria: (i) Cash and cash equivalents from the proceeds from the capital increase carried out in 2013 were excluded from the combined financial statements; and (ii) Cash and cash equivalents remaining after excluding the 2013 capital increase proceeds, were allocated based on the exercise carried out by Enersis’ management, the ratios obtained for the division of the cash and cash equivalents, were as follows: Proportion of Entity Chile Américas Enersis 42% 58% Endesa S.A. 66% 34% Chilectra S.A. 63% 37% Intercompany balances and transactions with related companies Intercompany balances with successors of Enersis were allocated by identifying the entity that provided/received the service as well as the nature of it. Intercompany balances with the Company were eliminated in full for the purpose of the combined financial statements. Intercompany balances with Enel Américas are included in the combined financial statements and disclosed as accounts with related companies. Debt instruments and related interest expenses, exchange differences and effects of hedge accounting strategies Financial debt and related interest expenses and exchange rate differences of the Chilean subsidiaries of Enersis were included in the combined financial statements. Financial debt and related interest expenses and exchange rate differences of Enersis stand-alone was 100% allocated to Enel Americas and were not included in the combined financial statements. In relation to derivative instruments designated as hedging instruments for the Chilean subsidiaries of Enersis, these were included in the combined financial statements. Enersis’ management adopted as a criterion to keep the strategies of hedge accounting. Therefore, all effects on the statement of financial position, income and other comprehensive income were assigned to the specific companies to which the hedged items were assigned. In the case of Enersis on a stand-alone basis, the main items covered by the hedging strategies were related to debt (hedging exposure to foreign currency debt and variability in interest rates). Therefore, the main derivative instruments associated with such hedging strategies were assigned accordingly to Enel Américas, the entity that assumed 100% of the debt of Enersis stand-alone entity, or the Company, as applicable. Personnel, salary expenses other employee benefits For purposes of properly distributing the accounting effect of personnel from Enersis on a stand-alone basis between the Company and Enel Américas, the Enersis’ management defined as a criterion to identify those personnel whose main activities were related 100% to the operations based in Chile under Enersis. This group of employees was assigned to the Company. On the other hand, management also identified those employees whose main activities related 100% to foreign operations. This group of employees was assigned to Enel Américas. All remaining personnel, who divide their main activities between the Chilean operations of Enersis and foreign operations, were assigned to the Company, meaning that from the date of the Spin-Off, those employees would identify the activities offered to foreign operations of Enersis and vice-versa. The existing contracts of inter-company provision of services between foreign and local businesses ensure reimbursement of the incurred costs of these employees that were allocated based on the time dedicated to activities offered to the Company’s entities from their total available time. The table below sets forth the breakdown of employees allocated to the Company and Enel Américas: Employee Entity Chile Américas Enersis 391 87 Endesa S.A. 925 7 Chilectra S.A. 668 2 Total 1,984 96 Once the allocation of personnel was determined Enersis management applied the following criterion to the division of all the personnel related accounts in the statements of financial position and comprehensive income that were associated with the costs directly related to the personnel, such as wages and salaries, post-employment benefit obligations expense and social security and other benefits, travel expenses, etc. In this regard their allocation was performed based on the specific assignment of the related personnel to the Combined Group, as described above. Other share costs The combined statements of income include expense allocations for certain corporate functions provided by Enersis, including, but not limited to, human resources administration, treasury, risk management, internal audit, accounting, tax, legal, insurance, medical services, information technology support, communication management, and other shared services. These expenses were allocated to the Company and Enel Américas based on a specific identification basis, and in other cases these expenses were allocated by Enersis based on a pro-rata basis of headcount or some other basis depending on the nature of the allocated cost. Management considers the basis on which the expenses were allocated to reasonably reflect the utilization of services provided to or the benefit received by the Company during the periods presented. Dividends receivable and payable The criterion defined by Enersis’ management to allocate to both the Company as well as to Enel Américas a portion of dividends receivable accounts from Enersis stand-alone as of the date of the Spin-Off, was based mainly on identifying the origin of each one of those dividends. If the dividends come directly from a Chilean subsidiary, these dividends were allocated 100% to the Company. Income tax The tax effect (income statement and income tax provision) related to the Chilean subsidiaries of Enersis was included in the combined financial statements and was calculated using the statutory corporate tax rates according to the jurisdiction where the pre-tax income was originated. In addition, for the tax effect in the income statement of Enersis on a stand-alone basis it was allocated to the combined financial statements by determining a hypothetical taxable income as if the Company and Enel Américas had operated as separate taxpayers. However, and from a tax point of view, there is currently only one taxpaying company, which is Enersis’ successor Enel Américas. Accordingly, income tax payable by Enersis was allocated to the combined financial statements. In relation to deferred tax assets and liabilities, these were assigned to the Company and Enel Américas, taking into account the underlying assets and liabilities, whose respective temporary differences have originated such deferred taxes. Other working capital accounts Working capital items such as accounts receivable, accounts payable and inventories that were directly attributable to the Chilean operations of the Combined Group were included in the combined financial statements. 2.2 New accounting pronouncements a) Accounting pronouncements effective from January 1, 2017: Amendments and Improvements Mandatory application for annual periods beginning on or after: Amendment to IAS 12: Recognition of Deferred Tax Assets for Unrealized Losses The purpose of the amendments to IAS 12 “Income Taxes” is to provide requirements on recognition of deferred tax assets for unrealized losses, and clarify how to account for deferred tax assets related to debt instruments measured at fair value. January 1, 2017 Amendment to IAS 7: Disclosure Initiative The amendments to IAS 7 “Statement of Cash Flows” are part of the IASB’s initiative aimed at improving presentation and disclosure of information in the financial statements. The amendments add additional disclosure requirements relating to financing activities in the statement of cash flows. See note 5.e for the disclosures required by this amendment January 1, 2017 Annual Improvements to IFRS (2014 – 2016 Cycle) Annual improvements correspond to a series of limited scope amendments clarifying, correcting or eliminating redundancy in IFRS 12 “Disclosures of Interests in Other Entities”. January 1, 2017 The amendments and improvements to the standards, which came into effect on January 1, 2017, had no significant effect on the consolidated financial statements of the Company and its subsidiaries. The disclosures required by IAS 7 relating to financing activities are presented in Note 6 (e). b) Accounting pronouncements effective from January 1, 2018 and subsequent periods: As of the date of issue of these consolidated financial statements, the following accounting pronouncements had been issued by the IASB, but their application was not yet mandatory: New Standards and Interpretations Mandatory application for annual periods beginning on or after: IFRS 9: Financial Instruments January 1, 2018 IFRS 15: Revenue from Contracts with Customers . January 1, 2018 IFRS 16: Leases January 1, 2019 IFRIC 22: Foreign Currency Transactions and Advance Consideration January 1, 2018 IFRIC 23: Uncertainty over Income Tax Treatments January 1, 2019 • IFRS 9 – Financial Instruments In July 2014, the IASB issued the final version of IFRS 9 that replaces IAS 39 Financial Instruments: Recognition, Measurement, and all previous versions of IFRS 9. IFRS 9 is effective for annual periods beginning on or after January 1, 2018, with early application permitted. The company will adopt the standard on the date of effective application without restating previous periods, recognizing the cumulative effect of its initial application as an adjustment to the opening balance of accumulated earnings (or another component of the estate, as appropriate). IFRS 9 brings together all three phases of the IASB’s project on financial instruments: (i) classification and measurement, (ii) impairment and (iii) hedge accounting. Enel Chile carried out a detailed evaluation of the three aspects of the standard and its impact on the Group's consolidated financial statements (i) Classification and measurement IFRS 9 introduces a new classification approach for financial assets, - Amortized cost, if the financial assets are held within a business model whose objective is to collect contractual cash flows; - Fair value through other comprehensive income, if the financial assets are held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and - Fair value through profit or loss, a residual category that consists of financial instruments that are not held within any of the two business models previously discussed, including those held for trading and those designated at fair value on initial recognition. For financial liabilities However, IFRS 9 introduces new requirements for financial liabilities designated at fair value through profit or loss, which states that under certain circumstances, changes in fair value originated by the variation of an entity’s own credit risk will be recognized in other comprehensive income. Based on the assessment made, the Group considers that the new classification requirements will not have a significant impact on the accounting of its financial assets. Loans and receivables are held to collect contractual cash flows that are solely payment of principal and interest, therefore, they meet the criteria to be measured at amortized cost under IFRS 9. Investments in equity instruments classified as available for sale will continue to be measured at fair value through other comprehensive income, except for those where the cost represents the best estimate of their fair value. (ii) Impairment The new impairment model in IFRS 9 is based on expected credit losses, as opposed to the incurred loss model in IAS 39. Consequently, under IFRS 9 impairment losses will be recognized, generally, earlier than current practice. The new impairment model will be applied to financial assets measured at amortized cost and those measured at fair value through other comprehensive income. The allowance for impairment losses will be measured based on: - 12-month expected credit losses; or - Lifetime expected credit losses, if the credit risk of a financial asset at the reporting date has increased significantly since initial recognition. The standard allows the application of a simplified approach for trade receivables, contract assets and lease receivables so that the impairment is always recognized in reference to the lifetime expected credit losses for the asset. The Group has chosen to apply this policy for the designated financial assets. Based on the new methodology for estimating expected credit losses, the Group estimates that the application of the impairment requirements of IFRS 9 do not have significant impact. For the year ended December 31, 2017 the quantification involves a higher net tax provision of approximately ThCh$4,000,000 . (iii) Hedge Accounting IFRS 9 introduces a new model for hedge accounting in order to more closely align the accounting treatment with risk management activities of the entities and to establish a new principle-based approach. The new model will enable entities to better reflect risk management activities in the financial statements, and allow more items to be eligible as hedged items, such as non-financial risk component, net positions, and aggregated exposures (i.e., a combination of derivative and non-derivative exposure). The most significant changes in relation to hedging instruments compared to hedge accounting methodology in IAS 39, is the possibility to defer in other comprehensive income the time value of options, forward points in forward contracts, and foreign currency basis spread, until the hedged item impacts profit or loss. IFRS 9 also eliminates the current quantitative requirement for hedge effectiveness test, under which the results of the testing must be within a range of 80-125 percent. This will allow aligning hedge effectiveness with risk management by demonstrating the existence of an economic relationship between the hedging instrument and the hedged item When initially applying IFRS 9, the Group may choose as its accounting policy to continue to apply the hedge accounting requirements of IAS 39 instead of the requirements in IFRS 9, until the time the new requirements on macro-hedging are published and adopted. The Group’s current plan is that it will elect to apply the new requirements of IFRS 9. Implementing the new model included assessing the existing hedge relationships and the analysis of new strategies that may be applied under the new standard. The Group considers that all the existing hedge relationships at December 31, 2017, which have been designed as efficient hedges, will continue to be suitable for hedge accounting under IFRS 9. Similarly, non-accounting hedges will continue to be measured at fair value through profit or loss under the new standard. • IFRS 15 – Revenue from Contracts with Customers In May 2014, the IASB published IFRS 15; the Standard is applicable to all contracts with customers, with certain exemptions. The new revenue standard supersedes all current revenue recognition standards: - IAS 11 - IAS 18 Revenue; - IFRIC 13 Customer Loyalty Programs; - IFRIC 15 Agreements for the Construction of Real Estate; - IFRIC 18 Transfers of Assets from Customers; and - SIC-31 Revenue – Barter Transactions Involving Advertising Services. The standard shall be applied for annual periods beginning on or after January 1, 2018. Early adoption is permitted. The Group plans to adopt the new standard on the required effective date using the modified retrospective method. Consequently, the Group will apply IFRS 15 retrospectively only to those contracts effective on January 1, 2018, recognizing the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings (or another category of equity, if appropriate) of the annual reporting period that includes the date of initial application. This new Standard introduces a general framework for recognition and measurement of revenue, based on the core principle that revenues are recognized for an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring promised goods or services to customers. This core principle shall be applied using a five-step approach to revenue recognition: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contracts; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. IFRS 15 requires more detailed disclosures than the current requirements. The disclosure requirements represent a significant change as compared to current practice and increase significantly the volume of disclosures to be included in the Group’s financial statements. In April 2016, the IASB issued amendments to IFRS 15 to clarify certain requirements and to provide additional practical expedients for transition. The amendments are mandatorily effective on the same date as the Standard, i.e., January 1, 2018. The Group carried out an implementation project to identify and measure the potential impact of applying IFRS 15 on its consolidated financial statements. The project included the identification of all revenue streams of Enel Chile and its subsidiaries, use of our knowledge of the customary business practices, a comprehensive evaluation of each type of contract with clients and determining the methodology for recognizing revenue under current standards. The assessment was performed with an special focus on those contracts with key aspects under IFRS 15 and the specific characteristics of interest to the Group, such as: identifying contractual obligations; contracts with multiple deliverables and recognition timing; contracts with variable compensation; significant financing component; analysis of principal versus agent; existence of service guarantees; and recognition of costs of obtaining and fulfilling a contract. The Enel Chile Group participates in the electrical energy generation, transmission and distribution businesses, and related activities. Based on the nature of the goods and services offered and the characteristics of its revenue streams, the Group does not expect that application of IFRS 15 will have a material impact on the consolidated financial statements of Enel Chile and subsidiaries. 1. Sales and transportation of electricity: The main source of revenue of Enel Chile is from the sale of a series of goods and services whose control is transferred over time, since the customer simultaneously receives and consumes the benefits provided by the Group. In accordance with the criteria under IFRS 15, the Group will continue recognizing revenue over time, instead of at a point in time. 2. Construction contracts: Revenue from construction works in progress is recognized over time based on the stage of completion. The Group concluded under IFRS 15, that these contracts meet the criteri of performance obligations satisfied over time, since the customer controls the assets as the assets are created and enhanced. Therefore, the Standard will not change the timing or the amount of revenue recognized pursuant to these construction contracts. 3. Sale of other goods and services: Correspond mainly to the sale of supplementary electrical-related goods and services whose control is transferred to the customer at a point in time. Revenue is recognized when the control of the good or service has been transferred to the customer, i.e. when the customer obtains substantially all of the benefits from the asset and the ability to direct its use. Therefore, the Standard will not change the timing or the amount of revenue recognized pursuant to these contracts. The Group is assessing the necessary changes and improvements in the systems, internal controls, policies and procedures, in order to meet the new disclosure requirements of IFRS 15. • IFRS 16 - Leases In January 2016, the IASB published IFRS 16, which establishes recognition, measurement, presentation and disclosure principles for lease agreements. IFRS 16 supersedes IAS 17, Leases Determining whether an Arrangement contains a Lease Operating Leases—Incentives, Evaluating the Substance of Transactions Involving the Legal Form of a Lease The standard is effective for annual periods beginning on or after January 1, 2019. Early application is permitted for entities that apply IFRS 15 at or before the date of initial application of IFRS 16. The Group does not plan to adopt the Standard early. Although IFRS 16 substantially retains the definition of a lease in IAS 17, the main change is the incorporation of the “control” concept within the new definition. In relation to the accounting treatment for a lessee and a lessor, the new Standard states the following: i) Lessee accounting: IFRS 16 requires lessees to account for all leases under a single model, similar to accounting for finance leases under IAS 17. As a result, at the date of commencement of a lease, the lessee will recognize on the statement of financial position a right-to-use asset and a lease liability for the future payments. Subsequent to initial recognition, it will recognize in the statement of profit or loss the depreciation expense of the asset separately from the interest related to the liability. The standard provides two voluntary recognition exceptions for low-value leases and short-term leases. ii) Lessor accounting: Under IFRS 16 is substantially unchanged from current accounting under IAS 17. Lessors will continue to classify leases using the same classification principles as in IAS 17 as operating and finance leases. IFRS 16 provides a series of practical expedients for the transition, both for the definition of a lease and for retrospective application of the standard. The Group has not yet decided if it will use certain or all of the practical expedients. The Group is currently carrying out an assessment of the potential impact of IFRS 16 on its consolidated financial statements. The quantitative effect will depend on, among others, the chosen transition method, the extent to which the Group uses the practical expedients and recognition exemptions, and any additional lease contract entered into by the Group in the future. • IFRIC 22 – Foreign Currency Transactions and Advance Consideration This Interpretation clarifies the date of the transaction for the purpose of determining the exchange rate to use in foreign currency transactions when the consideration is paid or received before recognizing related revenues, expenses or assets. For this purposes, the date of the transaction is the date on which an entity initially recognizes the non-monetary asset or non-monetary liability arising from the payment or receipt of advance consideration. The Interpretation is effective for annual periods beginning on or after January 1, 2018. Early application is permitted. The Group expects that this new Interpretation will not have a material effect on the consolidated financial statements of Enel Chile and its subsidiaries. • IFRIC 23 – Uncertainty over Income Tax Treatments In June 2017, the IASB issued IFRIC 23 to clarify the application of recognition and Measurement requirements in IAS 12, Income Taxes The Interpretation is effective for annual periods beginning on or after January 1, 2019. Early application is permitted. The Group’s management is currently assessing the potential impact that IFRIC 23 will have on its consolidated financial statements on its initial application. Improvements and Amendments Mandatory Annual Improvements to IFRS (Cycles 2014-2016) Annual improvements correspond to a series of minor amendments clarifying, correcting or eliminating redundancy in the following standards: IFRS 1 “First-time Adoption of IFRS and IAS 28 “Investments in Associates and Joint Ventures”. January 1, 2018 Amendment to IFRS 2: Classification and Measurement of Share-based Payment Transactions The amendments provide specific accounting requirements for: (i) the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payments; (ii) share-based payment transactions with a net settlement feature for withholding tax obligations; and (iii) a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. January 1, 2018 Amendments to IAS 40: Transfers of investment property The IASB issued this amendment to clarify that a change in management’s intentions for the use of a property by itself does not constitute evidence of a change in use and not a sufficient reclassification criteria. January 1, 2018 Amendments to IFRS 9: Prepayment features with negative compensation The amendments allow entities to measure prepayable financial assets with negative compensation at amortized cost or at fair value through other comprehensive income upon compliance of certain specific condition, instead of being measured at fair value through profit or loss. January 1, 2019 Amendments to IAS 28: Long-term interests in Associates and Joint Ventures The IASB issued these amendments to clarify that an entity that applies IFRS 9 to long-term interests in an associate or joint venture that form part of the net investment in the associate or joint venture but to which the equity method is not applied. January 1, 2019 Annual Improvements to IFRS (Cycle 2015-2017) Annual improvements correspond to a series of limited scope amendments that clarify the wording in an IFRS Standard or correct relatively minor oversights or conflicts between existing requirements of IFRS Standards: IFRS 3 “Business combination”, IFRS 11 “Joint arrangements”, IAS 12 “Income taxes” and IAS 23 “Borrowing costs ”. January 1, 2019 Amendment to IFRS 10 and IAS 28: Sale or Contribution of Assets The amendment corrects an inconsistency between IFRS 10 “Consolidated Financial Statements” and IAS 28 “Investments in Associates and Joint Ventures” relating to the accounting treatment of the sale or contributions of assets between an Investor and its Associate or Joint Venture. The IASB decided to postpone the effective date of application of the amendment, until obtaining the results of its research Project on the equity method of accounting. Effective date deferred indefinitely. In Management’s opinion, the application of the foregoing amendments and annual improvements is not expected to have a significant effect on the consolidated financial statements of Enel Chile and its subsidiaries. 2.3 Responsibility for the information, judgments and estimates provided Management is responsible for the information contained in these consolidated financial statements and expressly states that all IFRS principles and standards, as issued by the IASB, have been fully implemented. In preparing the consolidated financial statements, certain judgments and estimates made by management have been used to quantify some of the assets,

Accounting Policies Applied

Accounting Policies Applied	12 Months Ended
	Dec. 31, 2017
Accounting Policies Applied [Abstract]
Accounting Policies Applied	3. ACCOUNTING POLICIES APPLIED. The main accounting policies used in preparing the accompanying consolidated financial statements are the following: a) Property, plant and equipment Property, plant and equipment are measured at acquisition cost, net of accumulated depreciation and any impairment losses they may have experienced. In addition to the price paid to acquire each item, the cost also includes, where applicable, the following concepts: • Financing expenses accrued during the construction period that are directly attributable to the acquisition, construction, or production of qualified assets, which require a substantial period of time before being ready for use such as, for example, electricity generation or distribution facilities. The Group defines “substantial period” as one that exceeds twelve months. The interest rate used is that of the specific financing or, if none exists, the weighted average financing rate of the company carrying out the investment. (See Note 15.b.1). • Employee expenses directly related to construction in progress. (See Note 15.b.2). • Future disbursements that the Group will have to incur to close its facilities are added to the value of the asset at fair value, recognizing the corresponding provision for dismantling or restoration. The Group reviews its estimate of these future disbursements on an annual basis, increasing or decreasing the value of the asset based on the results of this estimate (See Note 22). Items for construction work in progress are transferred to operating assets once the testing period has been completed and they are available for use, at which time depreciation begins. Expansion, modernization or improvement costs that represent an increase in productivity, capacity or efficiency, or a longer useful life are capitalized as increasing the cost of the corresponding assets. The replacement or overhaul of entire components that increase the asset’s useful life or economic capacity are recorded as an increase in cost for the respective assets, derecognizing the replaced or overhauled components. Expenditures for periodic maintenance, conservation and repair are recognized directly as an expense for the year in which they are incurred. Property, plant and equipment, net of its residual value, is depreciated by distributing the cost of the different items that comprise it on a straight-line basis over its estimated useful life, which is the period during which the Group expects to use the assets. Useful life estimates and residual values are reviewed on an annual basis and if appropriate adjusted prospectively. The following table sets forth the main categories of property, plant and equipment with their respective estimated useful lives: Categories of Property, plant and equipment Years of estimated useful lives Buildings 10 – 60 Plant and equipment 6 – 65 IT equipment 3 – 15 Fixtures and fittings 2 – 35 Motor vehicles 5 – 10 Additionally, the following table sets forth more details on the useful lives of plant and equipment items: Years of estimated useful lives Generating facilities: Hydroelectric plants Civil engineering works 10 – 65 Electromechanical equipment 10 – 45 Fuel oil/coal-fired power plants 25 – 40 Combined cycle power plants 10 – 25 Renewable energy power plants 20 Transmission and distribution facilities: High-voltage network 10 – 60 Low- and medium-voltage network 10 – 50 Measuring and remote control equipment 10 – 50 Primary substations 6 – 25 Natural gas transport facilities Pipelines 20 Land is not depreciated since it has an indefinite useful life. Gains or losses that arise from the sale or disposal of items of Property, plant and equipment are recognized as “Other gains (losses)” in the comprehensive income statement and are calculated by deducting the net carrying amount of the asset and any sales expenses from the amount received in the sale. b) Investment property Investment property includes land and buildings held for earning rentals and/or for capital appreciation. Investment property is measured at acquisition cost less any accumulated depreciation and impairment losses that have been incurred. Investment property, excluding land, is depreciated on a straight-line basis over the useful lives of the related assets. An investment property is derecognized upon disposal or when no future economic benefits are expected from its use or disposal. Gains or losses on recognition of the investment property is calculated as the difference between the net disposal proceeds and the carrying amount of the asset. The breakdown of the fair value of investment property is detailed in Note 16. c) Goodwill Goodwill arising from business combinations, and reflected upon consolidation, represents the excess value of the consideration paid plus the amount of any non-controlling interests over the Group’s share of the net value of the assets acquired and liabilities assumed, measured at fair value at the acquisition date. If the accounting for a business combination is completed within the following year after the acquisition date, and so is the goodwill determination, the entity recognizes the corresponding adjustments to the provisional amounts as if the accounting for the business combination had been completed at the acquisition date. During the measurement period of the business combination, the goodwill can be adjusted as a result of changes in the recognized provisional amounts of the assets acquired and liabilities assumed (See note 2.7.1). Goodwill arising from acquisition of companies with functional currencies other than the Chilean peso is measured in the functional currency of the acquired company and translated to Chilean pesos using the exchange rate effective as of the date of the statement of financial position. Goodwill is not amortized; instead, at the end of each reporting period or when there are indicators that an impairment might have occurred, the Group estimates whether any impairment loss has reduced its recoverable amount to an amount less than the carrying amount and, if so, an impairment loss is immediately recognized in profit or loss (See Note 3.e). d) Intangible assets other than goodwill Intangible assets are initially recognized at their acquisition cost or production cost, and are subsequently measured at their cost, net of their accumulated amortization and impairment losses they may have experienced. Intangible assets are amortized on a straight line basis during their useful lives, starting from the date when they are ready for use, except for those with an indefinite useful life, which are not amortized. As of December 31, 2017 and 2016, there are no significant intangible assets with an indefinite useful life. An intangible asset is derecognized on disposal, or when no future economic benefits are expected from use or disposal. Gains or losses arising from derecognition of an intangible asset, measured as the difference between the net disposal proceeds and the carrying amount of the asset are recognized in profit or loss when the asset is derecognized. The criteria for recognizing these assets’ impairment losses and, if applicable, recovery of impairment losses recorded in previous periods are explained in Note 3.e below. d.1) Research and development expenses The Group recognizes the costs incurred in a project’s development phase as intangible assets in the statement of financial position as long as the project’s technical feasibility and future economic benefits have been demonstrated. Research costs are recorded as an expense in the consolidated statement of comprehensive income in the period in which they are incurred. d.2) Other intangible assets Other intangible assets correspond to computer software, water rights, and easements. They are initially recognized at acquisition or production cost and are subsequently measured at cost less accumulated amortization and impairment losses, if any. Computer software is amortized (on average) over four years. Certain easements and water rights have indefinite useful lives and, therefore, are not amortized. e) Impairment of non-financial assets During the year, and principally at the end of each reporting period, the Group evaluates whether there is any indication that an asset has been impaired. If any such indication exist, the Group estimates the recoverable amount of that asset to determine the amount of the impairment loss. In the case of identifiable assets that do not generate cash flows independently, the Group estimates the recoverable amount of the Cash Generating Unit (CGU) to which the asset belongs, which is understood to be the smallest identifiable group of assets that generates independent cash inflows. Notwithstanding the preceding paragraph, in the case of CGU’s to which goodwill or intangible assets with indefinite useful lives have been allocated, a recoverability analysis is performed routinely at each period end. Recoverable amount is the higher of fair value less costs of disposal and value in use, which is defined as the present value of the estimated future cash flows. In order to calculate the recoverable amount of Property, plant, and equipment, as well as of goodwill, and intangible assets, the Group uses value in use criteria in practically all cases. To estimate value in use, the Group prepares future pre-tax cash flow projections based on the most recent budgets available. These budgets incorporate management’s best estimates of a CGU’s revenue and costs using sector projections, past experience and future expectations. In general, these projections cover the next five years, estimating cash flows for subsequent years by applying reasonable growth rates which, in no case, are increasing rates nor exceed the average long-term growth rates for the particular sector and country in which the Group operates. As of December 31, 2017, the growth rate used to extrapolate the projections was 3.1%. Future cash flows are discounted to calculate their present value at a pre-tax rate that covers the cost of capital for the business activity and the geographic area in which it is being carried out. The time value of money and risk premiums generally used among analysts for the business activity and the geographic zone are taken into account to calculate the pre-tax rate. The minimum and maximum pre-tax discount rates applied in the period ended December 31, 2017 expressed in nominal terms were 7.5% and 10.7%, respectively. If the recoverable amount of the CGU is estimated to be less than the net carrying amount of the asset, the corresponding impairment loss is recognized for the difference, and charged to “Reversal of impairment loss (impairment loss)” recognized in profit or loss" in the consolidated statement of comprehensive income. The impairment is first allocated to reduce the carrying amount of any goodwill allocated to the CGU, and then to the other assets of the unit pro rata on the basis of the carrying amount of each asset in the unit. The carrying amount of an asset is not reduced below the highest of fair value less costs of disposal, its value in use; or zero. Impairment losses recognized for an asset in prior periods are reversed when there are indications that the impairment loss no longer exists or may have decreased, thus increasing the asset’s carrying amount with a credit to earnings. The increase in the asset’s carrying amount shall not exceed that carrying amount that would have been determined had no impairment loss been recognized for the asset. Goodwill impairment losses are not reversed in subsequent periods. f) Leases In order to determine whether an arrangement is, or contains, a lease, the Group assesses the economic substance of the agreement, in order to determine whether fulfillment of the arrangement depends on the use of a specific asset and whether the agreement conveys the right to use an asset. If both conditions are met, at the inception of the arrangement the Group separates the payments and other considerations relating to the lease, at their fair values, from those corresponding to other components of the agreement. Leases that substantially transfer all the risks and rewards of ownership to the Group are classified as finance leases. All others leases are classified as operating leases. Finance leases in which the Group acts as a lessee are recognized at the inception of the arrangement. At that time, the Group records an asset based on the nature of the lease and a liability for the same amount, equal to the fair value of the leased asset or the present value of the minimum lease payments, if the latter is lower. Subsequently, the minimum lease payments are apportioned between finance expenses and reduction of the lease obligation. Finance expenses are recognized immediately in the income statement and allocated over the lease term, so as to achieve a constant interest rate on the remaining balance of the liability. Leased assets are depreciated on the same terms as other similar depreciable assets, as long as there is reasonable certainty that the lessee will acquire ownership of the asset at the end of the lease. If no such certainty exists, the leased assets are depreciated over the shorter of the useful lives of the assets and their lease term. In the case of operating leases, payments are recognized as an expense in the case of the lessee and as income in the case of the lessor, both on a straight-line basis, over the term of the lease unless another type of systematic basis of distribution is deemed more representative. g) Financial instruments Financial instruments are contracts that give rise to both a financial asset in one entity and a financial liability or equity instrument in another entity. g.1) Financial assets other than derivatives The Group classifies its financial assets other than derivatives, whether permanent or temporary, except for investments accounted for using equity method (See Notes 3.i and 12) and those held for sale, into four categories: • Loans and account receivables: The effective interest method is used to calculate the amortized cost of a financial asset or liability (or group of financial assets or financial liabilities) and of allocating finance income or cost over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash flows to be received or paid over the expected life of the financial instrument or, when appropriate, a shorter period to the net carrying amount of the financial asset or financial liability. • Held-to-maturity investments: • Financial assets at fair value with changes in net income: This category includes the trading portfolio and those financial assets that have been designated as such upon initial recognition and that are managed and evaluated on a fair value basis. They are measured in the consolidated statement of financial position at fair value, with changes in value recorded directly in income when they occur. • Available-for-sale financial assets: These investments are recognized in the consolidated statement of financial position at fair value when it can be reliably determined. For investments in equity instruments in unlisted companies or companies with lower levels of liquidity, normally the fair value cannot be reliably measured. When this occurs, those investments in equity instruments are measured at cost less impairment losses, if any. Changes in fair value, net of taxes, are recognized in other comprehensive income, until the investments are disposed of, at which time the amount accumulated in other comprehensive income is reclassified to profit or loss. If the fair value is lower than cost, and if there is objective evidence that the asset has been more than temporarily impaired, the difference is recognized directly in profit or loss. Purchases and sales of financial assets are accounted for using their trade date. g.2) Cash and cash equivalents This item within the consolidated statement of financial position includes cash and bank balances, time deposits, and other highly liquid investments (with original maturity of less than or equal to 90 days) that are readily convertible to cash and are subject to insignificant risk of changes in value. g.3) Impairment of financial assets The following criteria are used to determine if a financial asset has been impaired: • For trade receivables in the electricity generation, transmission and distribution segments, the Group’s policy is to recognize impairment losses when there is objective evidence that the balance will not be recoverable. In general terms, the Group’s entities has a defined policy to recognize an allowance for impairment losses based on the aging of past-due balances, except in those cases where a specific collective basis analysis is recommended, such as in the case of receivables from government-owned companies (See Note 8). • In the case of receivables of a financial nature, that are included in the “Loan and receivables” and “Investment held-to-maturity”, impairment is determined on case-by-case basis and is measured as the difference between the carrying amount and the present value of the future estimated cash flows discounted at the original effective interest rate (See Notes 7 and 20). • For financial investments available-for-sale, the criteria for impairment applied are described in Note 3.g.1. g.4) Financial liabilities other than derivatives Financial liabilities are recognized based on cash received, net of any costs incurred in the transaction. In subsequent periods, these obligations are measured at their amortized cost using the effective interest rate method (see Note 3.g.1). In the particular case that a liability is the hedged item in a fair value hedge, as an exception, such liability is measured at its fair value for the portion of the hedged risk. In order to calculate the fair value of debt, both when it is recorded in the statement of financial position and for fair value disclosure purposes as shown in Note 20, debt has been divided into fixed interest rate debt (hereinafter “fixed-rate debt”) and variable interest rate debt (hereinafter “floating-rate debt”). Fixed-rate debt is that on which fixed-interest coupons established at the beginning of the transaction are paid explicitly or implicitly over its term. Floating-rate debt is that debt issued at a variable interest rate, i.e., each coupon is established at the beginning of each period based on the reference interest rate. All debt has been measured by discounting expected future cash flows with a market interest rate curve based on the payment currency. g.5) Derivative financial instruments and hedge accounting Derivatives held by the Group are transactions entered into to hedge interest and/or exchange rate risk, intended to eliminate or significantly reduce these risks in the underlying transactions being hedged. Derivatives are recorded at fair value at the end of each reporting period as follows: if their fair value is positive, they are recorded within “Other financial assets”; and if their fair value is negative, they are recorded within “Other financial liabilities.” For derivatives on commodities, the positive fair value is recorded in “Trade and other receivables,” and negative fair values are recorded in “Trade and other liabilities.” Changes in fair value are recorded directly in profit or loss, except when the derivative has been designated for hedge accounting purposes as a hedge instrument (in a cash flow hedge) and all of the conditions for applying hedge accounting are met, including that the hedge be highly effective. In this case, changes are recognized as follows: • Fair value hedges: The underlying portion for which the risk is being hedged (hedged risk) and the hedge instrument are measured at fair value, and any changes in value of both items are recognized in the statement of comprehensive income by offsetting the effects in the same comprehensive income statement account. • Cash flow hedges: Changes in fair value of the effective portion of the hedged item and hedge instrument are recognized in other comprehensive income an accumulated in an equity reserve known as “Reserve for cash flow hedges.” The cumulative gain or loss in this reserve is reclassified to the statement of comprehensive income to the extent that the hedged item impacts the statement of comprehensive income offsetting the effect in the same comprehensive income statement account. Gains or losses from the ineffective portion of the hedging relationship are recorded directly in the statement of comprehensive income. A hedge relationship is considered highly effective when changes in fair value or in cash flows of the underlying item directly attributable to the hedged risk are offset by changes in fair value or cash flows of the hedging instrument, with an effectiveness ranging from 80% to 125%. As a general rule, long-term commodity purchases or sales agreements are recognized in the statement of financial position at their fair value at the end of each reporting period, recognizing any differences in value directly in profit or loss, except for, when all of the following conditions are met: • The sole purpose of the agreement is for the Group’s own use, which is understood as: (i) in the case of fuel purchase agreements its used to generate electricity; (ii) in the case of electrical energy purchased for sale, its sale to the end-customers; and, (i) in the case of electricity sales its sale to the end-customers. • The Group’s future projections evidence the existence of these agreements for its own use. • Past experience with agreements evidence that they have been utilized for the Group’s own use, except in certain isolated cases when for exceptional reasons or reasons associated with logistical issues have been used beyond the control and projection of the Group. • The agreement does not stipulate settlement by differences and the parties have not made it a practice to settle similar contracts with differences in the past. The long-term commodity purchase or sale agreements maintained by the Group, which are mainly for electricity, fuel, and other supplies, meet the conditions described above. Thus, the purpose of fuel purchase agreements is to use them to generate electricity, electricity purchase contracts are used to sell to end-customers, and electricity sale contracts are used to sell the Group’s own products. The Group also evaluates the existence of derivatives embedded in contracts or financial instruments to determine if their characteristics and risk are closely related to the host contract, provided that when taken as a whole they are not being accounted for at fair value. If they are not closely related, they are recorded separately and changes in value are accounted for directly in profit or loss. g.6) Derecognition of financial assets and liabilities Financial assets are derecognized when: • The contractual rights to receive cash flows from the financial asset expire or have been transferred or, if the contractual rights are retained, the Group has assumed a contractual obligation to pay these cash flows to one or more recipients. • The Group has substantially transferred all the risks and rewards of ownership of the financial asset, or, if it has neither transferred nor retained substantially all the risks and rewards, when it does not retain control of the financial asset. Transactions in which the Group retains substantially all the inherent risks and rewards of ownership of the transferred asset, it continues recognizing the transferred asset in its entirety and recognizes a financial liability for the consideration received. Transactions costs are recognized in profit and loss by using the effective interest method (See Note 3.g.1). Financial liabilities are derecognized when they are extinguished, that is, when the obligation arising from the liability has been paid or cancelled, or has expired. g.7) Offsetting financial assets and liabilities. The Group offsets financial assets and liabilities and the net amount is presented in the statement of financial position when, and only when: • There is a legally enforceable right to set off the recognized amounts; and • There is an intention to settle on a net basis, or to realize the asset and settle the liability simultaneously. These rights can only be legally enforceable within the normal course of business, or in case of default, insolvency or bankruptcy, of one or all of the counterparts. g.8) Financial guarantee contracts Financial guarantee contracts, such as guarantees given by the Group to third parties, are initially recognized at fair value, adjusting the transaction costs that are directly attributable to the issuance of the guarantee. Subsequently to initial recognition, financial guarantee contracts are measured at the higher of: • The amount determined under accounting policy describe in Note 3.l; and • The amount initially recognized less, when appropriate, any accumulated amortization. • Registered in accordance with the revenue recognition policy (see Note 3.p). h) Measurement of fair value The fair value of an asset or liability is defined as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market, namely, the market with the greatest volume and level of activity for that asset or liability. In the absence of a principal market, it is assumed that the transaction is carried out in the most advantageous market available to the entity, namely, the market that maximizes the amount that would be received to sell the asset or minimizes the amount that would be paid to transfer the liability. In estimating fair value, the Group uses valuation techniques that are appropriate for the circumstances and for which there are sufficient data to conduct the measurement. The Group maximizes the use of relevant observable data and minimizes the use of unobservable data. Considering the hierarchy of the data used in these valuation techniques, the assets and liabilities measured at fair value can be classified into the following levels: Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 Inputs other than quoted prices included within Level 1 that are observable for the assets or liabilities, either directly (i.e. as prices) or indirectly (i.e. derived from prices). The methods and assumptions used to determine the fair values at Level 2 by type of financial asset or financial liability take into consideration estimated future cash flows discounted at zero coupon interest rate curves for each currency. All the valuations described are carried out using external tools, such as “Bloomberg”. Level 3: Inputs for assets or liabilities that are not based on observable market data (unobservable inputs). The Group takes into account the characteristics of the asset or liability when measuring fair value, in particular: • For non-financial assets, fair value measurement takes into account the ability of a market participant to generate economic benefits by using the asset in its highest and best use or by selling it to another market participant that would use the asset in its highest and best use; • For liabilities and equity instruments, the fair value measurement assumes that the liability would not be settled and an equity instrument would not be cancelled or otherwise extinguished on the measurement date. The fair value of the liability reflects the effect of non-performance risk, namely, the risk that an entity will not fulfill the obligation, which includes, but is not limited to, the Group’s own credit risk; • For derivatives not quoted in an organized market, the Group measures fair value by using the discounted cash flow method and generally accepted options valuation models, based on current and future market conditions as of year-end. This methodology also adjusts the value based on the Company’s own credit risk (Debt Valuation Adjustment, DVA), and the counterparty risk (Credit Valuation Adjustment, CVA). These CVA and DVA adjustments are measured on the basis of the potential future exposure of the instrument (creditor or borrower position) and the risk profile of both the counterparties and the Group itself. • In the case of financial assets and financial liabilities with offsetting positions in market risks or counterparty credit risks, it is permitted to measure the fair value on a net basis. However, this must be consistent with the manner in which market participants would price the net risk exposure at the measurement date. Financial assets and liabilities measured at fair value are disclosed in Note 20.3. i) Investments accounted for using the equity method The Group’s interests in joint ventures and associates are recognized using the equity method. Under the equity method, an investment in an associate or joint venture is initially recognized at cost. As of the acquisition date, the investment is recognized in the statement of financial position based on the share of its equity that the Group’s interest represents in its capital, adjusted for, if appropriate, the effect of transactions with Group’s entities, plus any goodwill generated in acquiring the entity. If the resulting amount is negative, zero is recorded for that investment in the statement of financial position, unless the Group has a present obligation (either legal or constructive) to support the investee’s negative equity situation, in which case a provision is recognized. Goodwill from associates or joint ventures is included in the carrying amount of the investment. It is not amortized but is subject to impairment testing as part of the overall investment carrying amount when impairment indicators exist. Dividends received from these investments are deducted from the carrying amount of the investment, and any profit or loss obtained from them to which the Group is entitled based on its ownership interest is recognized under “Share of profit (loss) of associates accounted for using equity method.” Appendix 3. “Associates and Joint Ventures” to these consolidated financial statements describes the relationship of the Company and each of these companies. j) Non-current assets (or disposal group of assets) held for sale or held for distribution to owners and discontinued operations. Non-current assets, including property, plant and equipment; intangible assets; investments accounted for using the equity method, joint ventures, and disposal groups (a group of assets to be disposed of and the liabilities directly associated with those assets), are classified as: - Held for sale, if their carrying amount will be recovered principally through a sale transaction rather than through continuing use - Held for distribution to owners, when the Company is committed to distribute the asset (or disposal group) to the owners. For the above classification, the assets must be available for immediate sale or distribution in their present condition and its sale or distribution is highly probable. For this transaction to be considered highly probable, management must be committed to the sale or distribution and actions to complete the transaction must have been initiated and should be expected to be completed within one year from the date of classification. Actions required to complete the sale or distribution plan should indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. The probability of shareholders’ approval (if required in the jurisdiction) should be considered as part of the assessment of whether the sale or distribution is highly probable. Non-current assets or disposal groups held-for-sale or held for distribution to owners are measured at the lower of their carrying amount and fair value less costs to sell or costs to distribute, as appropriate. Depreciation and amortization on these assets cease when they meet the criteria to be classified as non-current assets held for sale or held for distribution to owners. Assets that are no longer classified as held for sale or held for distribution to owners, or are no longer part of a disposal group, are measured at the lower of their carrying amounts before being classified as held for sale or held for distribution less any depreciations, amortizations or revaluations that would have been recognized if they had not been classified as held for sale

Sector Regulation and Electrici

Sector Regulation and Electricity System Operations	12 Months Ended
	Dec. 31, 2017
Disclosure Of Information About Amounts Recognised In Relation To Regulatory Deferral Account Balances [Abstract]
Disclosure Of Sector Regulations And Electricity System Operations Explanatory	4. SECTOR REGULATION AND ELECTRICITY SYSTEM OPERATIONS. 4.1 Regulatory framework: The electricity sector is regulated by the General Law of Electrical Services N°20,018 (Chilean Electricity Law), also known as DFL No. 1 of 1982, of the Ministry of Mining, whose compiled and coordinated text was established in DFL No. 4 issued in 2006 by the Ministry of Economy (the Electricity Law), as well as by an associated Regulation (D.S. No. 327 issued in 1998). Three government bodies are primarily responsible for enforcing this law: the National Energy Commission (CNE in its Spanish acronym), which has the authority to propose regulated tariffs (node prices) and to draw up indicative plans for the construction of new generating units; the Superintendency of Electricity and Fuels (SEF), which supervises and oversees compliance with the laws, regulations, and technical standards that govern the generation, transmission, and distribution of electricity, as well as liquid fuels, and gas; and the Ministry of Energy, which is responsible for proposing and guiding public policies on energy matters. It also oversees the SEF, the CNE, and the Chilean Commission for Nuclear Energy (CChEN in its Spanish acronym), thus strengthening coordination and allowing for an integrated view of the energy sector. The Ministry of Energy also includes the Agency for Energy Efficiency and the National Center for Innovation and Development of Sustainable Energy ( Centro Nacional para la Innovación y Fomento de las Energías Sustentables – From a physical point of view, the Chilean power sector is divided into three electrical grids: the Sistema Electrico Nacional Sistema Interconectado Central Sistema Interconectado del Norte Grande The electricity industry is organized into three business activities: generation, transmission, and distribution, all operating in an interconnected and coordinated manner, and whose main purpose is to supply electrical energy to the market at minimum cost while maintaining the quality and safety service standards required by the electrical regulations. As essential services, the power transmission and distribution businesses are natural monopolies; these segments are regulated as such by the Electricity Law, which requires free access to networks and regulates tariffs. Under the Chilean Electricity Law, the electricity market coordinates their operations through a centralizing operating agent, the Coordinador Eléctrico Nacional Sistema Eléctrico Nacional Limits on integration and concentration Chile has legislation in effect that defends free competition and, together with specific regulations that apply to the electricity market, defines criteria to avoid certain levels of economic concentration and/or abusive market practices. In principle, the regulator allows the participation of companies in different activities (e.g. generation, distribution, and commercialization) as long as there is an adequate separation of each activity, for both accounting and company purposes. Nevertheless, most of the restrictions imposed involve the transmission sector mainly due to its nature and to the need to guarantee adequate access to all agents. The Chilean Electricity Law establishes limits for participation of generation or distribution companies in the Trunk Transmission Systems, and prohibits participation of Trunk Transmission Systems’ companies in the generation and distribution segment. 4.1.1 Generation Segment Generation companies must comply with the operation plan of the CISEN. However, each generation company is free to decide whether to sell its energy to regulated or unregulated customers. Any surplus or deficit between a company’s sales to its customers and its energy supply is sold to, or purchased from, other generators at the spot market price. A generation company may have the following types of customers: (i) Unregulated customers: Those customers, mainly industrial and mining companies, with a connected capacity higher than 5,000 kW. These customers can freely negotiate prices for electrical supply with generators and/or distributors. Those customers with connected capacity between 500 and 5,000 kW have the option to contract energy at prices agreed upon with their suppliers or be subject to regulated prices, with a minimum term of at least four years under each pricing system. (ii) Distribution companies that supply power to regulated customers: Participation in public tenders regulated by the CNE for the supply to their free customers through bilateral contracts. (iii) Spot market: This represents energy and capacity transactions among generating companies that result from the CISEN’s coordination to keep the system running as economically as possible, where the surpluses (deficits) between a generator’s energy supply and the energy it needs to comply with business commitments are transferred through sales (purchases) to (from) other generators in the CISEN. In the case of energy, transfers are valued at the marginal cost, while node prices for capacity are set every semester by the regulators. In Chile, the capacity that must be paid to each generator depends on an annual calculation performed by the CISEN to determine the sufficiency capacity of each power plant, which is not the same as the dispatched capacity. Non-Conventional Renewable Energy Law No. 20,257 was enacted in April of 2008 to encourage the use of Non-Conventional Renewable Energy (NCRE). The principal aspect of this law is that at least 5% of the energy sold by generation companies to their customers must come from renewable sources between years 2010 and 2014. This requirement progressively increases by 0.5% from 2015 until 2024, when a 10% renewable energy requirement will be reached. This law was amended in 2013 by Law No. 20,698, dubbed the “20/25 law,” as it establishes that by 2025, 20% of energy supplied will be generated by NCRE. It does not change the previous law’s plan for supplying energy under agreements in effect in July 2013. 4.1.2. Transmission Segment The transmission segment is comprised of a combination of lines, substations and equipment for the transmission of electricity from the production points (generators) to the centers of consumption or distribution, which do not correspond to distribution facilities. The transmission segment is divided into National Transmission System, Development Poles Transmission System, Zonal Transmission System and Dedicated Transmission System. The International Interconnection Systems, which are governed by special rules, are also part of the transmission segment. The transmission system is open access, and transmission companies may impose rights of way over the available transmission capacity under non-discriminatory conditions. The fees of the existing facilities of the National and Zonal Transmission Systems is determined through a tariff setting process that is carried out every four years. In that process, the Annual Value of the Transmission is determined, which comprises efficient operation and maintenance costs and the annuity of the investment value, determined on the basis of a discount rate fixed by the authority on a quarterly basis (minimum 7% after tax) and the economic useful life of the facilities. The planning of the National and Zonal Transmission Systems a regulated and centralized process, in which the CISEN annually issues an expansion plan, which must be approved by the CNE. The expansions of both systems are carried out through open tenders, distinguishing between new projects (with tenders open to any bidder) and expansion of existing facilities projects (participation in the expansion corresponds to the original facilities owners under modification). The bids correspond to the value resulting from the tender, which constitutes the revenues for the first 20 years from the start of operation. As of the year 21, the fees of such transmission facilities are determined as if they were existing facilities. 4.1.3 Distribution segment The distribution segment is defined for regulatory purposes as all electricity supplied to end customers at a voltage no higher than 23 kV. Distribution companies operate under a distribution public utility concession regime, with service obligations and regulated tariffs for supplying regulated customers. Customers are classified based on their demand as regulated and unregulated. Regulated customers are those with connected capacity of more than 5,000 kW. Customers with connected capacity between 500 kW and 5,000 kW can choose either a regulated or an unregulated regime. Distribution companies can supply both regulated customers, under supply conditions regulated by the Law, and unregulated customers, whose supply conditions are freely negotiated and agreed in bilateral contracts with energy suppliers (generation or distribution companies). Regarding price regulation, the Law establishes that distribution companies must permanently have available energy supply, on the basis of open, non-discriminatory and transparent public tenders. These bidding processes are managed by the CNE and are carried out at least five years in advance. The result of the process is a “pay as bid” contract, with an extension up to 20 years. In case of unforeseen deviations in the projections of demand, the regulator has the authority to carry out short-term tenders. In addition, a reimbursement mechanism exists allowing supply without contract and regulating corresponding tariffs. The tariffs are set every four years in order to determine the distribution value added (“VAD”) as a result of model companies cost studies, composed of fixed costs, average energy and capacity losses and standard distribution costs. Both the CNE and the distribution companies grouped by typical areas engage independent consultants for these studies. The VAD is obtained by weighting the results of the study received by the CNE and the companies with a ratio of 2:3 and 1:3, respectively. Based on this result, the CNE structures basic tariffs and verifies that the aggregate profitability of the industry is within the established range of 10% with a margin of ± 4%. Additionally, every four years a review of services associated with the calculation of VAD is carried out, which do not represent energy supply and which the Free Competition Court qualifies as subject to tariff regulation. The Chilean distribution tariff model is a consolidated model, which already had eight cycles of tariff settings since the privatization of the sector. 4.2 Regulatory Developments in 2017 Law No. 20,928 - Tariff Equality Law On June 22, 2016, the Ministry of Energy published Law No. 20,928 in the Official Gazette, establishing tariff equality mechanisms for electrical services, amending the Electricity Law (DFL No. 4) of 2006. The law states that the maximum tariffs that distribution companies may charge to residential customers must not exceed the average national tariff by more than 10%. The differences arising from the application of this mechanism will be progressively absorbed by all the rest of the customers subject to regulated prices that are under the mentioned average, except for those residential users whose monthly average consumption of energy in the prior calendar year is lower than or equal to 200 kWh. In addition, the Law provides for a discount for consumers with installed capacity greater than 200 MW that are located in those cities with intensive energy generation. Nonetheless, the law allows the regulator to incorporate within the VAD certain services unrelated to energy distribution. In this context, in January 2017, the Ministry of Energy together with the CNE and SEF announced publicly the discontinuance of application of individual energy supply connection and disconnection service charge; also know as “cut-off and reconnection” charge. Prior to this announcement, the CNE requested distribution companies to discontinue the application of this charge, because this service charge will be incorporated in the tariff as part of the 2016 – 2020. Distribution Law On September 29, 2016, at the Seminar “The Future of Electric Power Distribution” the process to devise a new law on electric power distribution was launched. This process is led by the Ministry of Energy with collaboration of the Pontifical Catholic University of Chile. In November and December 2016 and until January 2017, certain thematic workshops were carried out: “Development of the distribution network”; “Future financing of the network and tarification”; “Business model of distribution”; and “Future services of the network”. On April 13, 2017, the first stage of the process related to the distribution industry diagnosis, was completed. It is expected that the results of the work carried out during the year 2017, will be delivered to the authorities that make up the next government . 2017 CNE Regulatory Plan On January 13, 2017, through Exempted Resolution No. 23 and pursuant Article 72-19 of the Chilean Electricity Law, the CNE published its Annual Work Plan aiming to draft and develop technical regulations for year 2017. The plan considers amendments to the Safety and Quality Service Technical Standard, new Technical Appendices and Technical Standards applicable to energy generation, distribution and transmission facilities. Regulatory developments in 2017 In 2017, several regulations associated with Transmission Law No. 20,936 were published, among others: (i) Regulation on Long-Term Energy Planning; (ii) Regulation setting the requirements and the procedure applicable to requests of international exchange of electric services; (iii) Regulation for determination of preliminary bands for new works in the transmission systems; (iv) Regulation for determination and payment of compensations for interruption of energy supply; and (v) Regulation on establishing Technical Standards ruling technical requirements on safety, coordination, quality, information and economics about electric sector operation. Furthermore, in December the Supplementary Services Regulations were submitted to the General Comprollership of the Republic and they are expected to be published in early 2018. Also, the regulations for the Transmission Law were published via Exempt Resolution No. 659: Technical provisions for implementing Article 8 of Law 20.870, which regulates payment of tax on emissions of the Steam-electric power plants as specified in the Tax Reform. Technical Standard of the Quality of Service for Distribution Systems On December 18, 2017, Exempted Resolution CNE 706 was published. It sets the Technical Standard of the Quality of Service for Distribution Systems. Preparation of this standard was considered in the CNE 2017 Regulatory Plan, for which a consulting committee was set up and the wording was submitted to public consultation. The new standard incorporates greater technical and commercial demands for the electrical energy distribution segment. The following are among the main areas addressed by the new regulations: Continuity Indicators (it incorporated the indicators SAIDI, SAIFI, TIC and FIC); Quality of the Product; Measurement, Monitoring and Control; and Commercial Quality. 2017 Expansion Plan - Transmission For the purposes of the expansion of the transmission segment, the Electricity Law considers a mandatory annual procedure on project planning for new facilities. In this context, the Ministry of Energy through Exempted Resolution CNE 770 issued on December 29, 2017 defined the new and expansion works of facilities within the planning process carried out in 2017. According to the milestones considered in the law, the stakeholders (duly registered in the citizen participation register) may make comments in that regard during the first days of January 2018. Tariff Study under Article No. 187 of the Electricity Law On October 6, 2017, CNE issued Exempted Resolution CNE 560, approving the unanimous agreement to perform a New Tariff Study in accordance with Article No. 187 of the Electricity Law, signed by CNE and the concessionaires of energy distribution service. In December, 2017, CNE requested to the distribution companies for their investment plans and necessary costs to comply with the Technical Standard on Quality of Service for Energy Distribution System 4.3 Tariff Revisions: 4.3.1 Distribution Tariff Setting At the end of 2015, the CNE began the 2016 – 2020 tariff setting process through publishing Exempted Resolution No. 699 communicating the definition for Typical Areas, the terms for the “Distribution Value Added 2016 – 2020 Study”, and the terms for the “Services associated with Energy Distribution Supply Cost Study”. The CNE defines six Typical Areas with separate tariff each, and Enel Distribución Chile was categorized within Typical Area No. 1, same as in prior tariff process, reflecting the higher density of its network and, therefore, lower costs as compared to other companies in the industry. The subsidiary Empresa Eléctrica de Colina and Luz Andes were categorized, same as in prior tariff process, within Typical Areas No. 4 and No. 2, respectively. In February 2016, the CNE published in the Official Gazette, Exempted Resolution No. 83 containing the list of the qualified independent consultant entities to be eligible by the distribution companies to carry out the tariff studies. In April 2016, Enel Distribución Chile selected Consultor Systep Ingeniería y Diseños S.A. to carry out the Distribution Value Added 2016 – 2020 Study. On September 5, 2016, Enel Distribución Chile submitted to the CNE the tariff study in compliance with the requirements indicated in the regulations. The 2016-2020 tariff setting process was finalized by publishing in the Official Gazette Tariff Decree 11T, the distribution tariffs are retrospectively applicable to November 4, 2016. The tariffs applied in 2016 and 2017 to end customers were determined based on the following decrees: i. Decree No. 1T published in the Official Gazette on April 2, 2013, set the tariff formulas applicable to regulated customers. Tariffs were retroactively applied with a start date of November 4, 2012 until November 3, 2016. ii. Decree No. 11T published in the Official Gazette on August 24, 2017, set the tariff indexation formulas applicable to energy supplies subject to regulated prices. Tariffs were retroactively applied from November 4, 2016 until November 3, 2020. iii. Decree No. 14 published in the Official Gazette on April 9, 2013, set the tariffs and indexation formulas applicable to the subtransmission and additional transmission systems. Tariffs were retroactively applied with a start date of January 1, 2011 until December 31, 2015. Subsequently, Decree No. 7T extended the effective date until December 31, 2015. iv. Price Decrees: Node Average prices: On January 4, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 22T, setting the node prices for energy supply, retroactively applied from September 1, 2015. On January 21, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 24T, setting the node prices for energy supply, retroactively applied from November 1, 2015. On March 4, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 1T, setting the node prices for energy supply, retroactively applied from January 1, 2016. On May 23, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 4T, setting the node prices for energy supply, retroactively applied from March 1, 2016. On June 17, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 7T, setting the node prices for energy supply, retroactively applied from April 1, 2016. On August 6, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 8T, setting the node prices for energy supply, retroactively applied from May 1, 2016. On September 1, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 9T, setting the node prices for energy supply as part of Law No. 20,928 on Tariff Equality in relation to the Domestic Generation Acknowledgement, retroactively applied from August 1, 2016. On October 10, 2017, the Ministry of Energy published in the Official Gazette, Decree No. 12T, setting the node prices for energy supply and the adjustments and surcharges from applying the Residential Rate Equality Mechanism, retroactively applied from January 1, 2017. On October 10, 2017, the Ministry of Energy published in the Official Gazette Decree No. 3T, setting the node prices for energy supply and the adjustments and surcharges from applying the Residential Rate Equality Mechanism, retroactively applied from July 1, 2017. Short-term node prices: On July 2, 2016, the Ministry of Energy published in the Official Gazette, Decree No. 5T, setting the short-term node prices for energy supply, retroactively applied from May 1, 2016. On August 26, 2017, the Ministry of Energy published in the Official Gazette, Decree No. 2T, setting short-term node prices for energy supply, retroactively applied from April 1, 2017. 4.3.2 Transmission Tariffs Setting Tariffs Setting 2020-2023 On December 29, 2017, the CNE through Exempted Resolution CNE No. 771, as part of the Transmission Tariff Setting process, issued the preliminary technical report “Rating the Transmission System Facilities” for the period 2020-2023. The report defines which transmission facilities correspond to each segment (National, Zonal and Dedicated). Final rating of the facilities must be considered for the transmission system valuation study (ies) purposes. In accordance to the milestones established in the law, stakeholders may make comments to the preliminary report during the first days of January 2018. Also, the law stipulates that, 24 months before the end of the effective period of the transmission systems’ rates, CNE must send the stakeholders (duly registered in the citizen participation register) the technical and administrative conditions for performing the transmission system valuation study or studies. In this context, via Exempted Resolution No.769, the regulator issued the Preliminary Technical and Administrative Conditions for the Transmission System Valuation Study. In general terms, the document regulates the process of contracting the rate study and defines the rules for setting the rates for all the transmission, defining tenders for two studies – one for national installations and the other for Zonal and Dedicated Installations. According to the stages considered in the law, stakeholders may make observations to this report during the first days of January 2018. 4.3.3 Subtransmission Tariff Setting On July 20, 2016, Law No. 20,936 was publish, setting the new regulatory framework for all electric energy transmission systems, making changes to the tariff process in all transmission sector. Also, the sector named “Subtransmission” was renamed to “Zonal Transmission”. The Zonal Transmission tariffs are set every four years. However, before publishing Law No. 20.936, the tariff period for Substansmission had been extended, as follows: • On January 29, 2015, Law No. 20,805 was published in the Official Gazette, which, among other matters, it entitles the Ministry of Energy to extend in one more year the effective date of Decree CNE No. 14 of 2012 (“Decree No.14”), which set the subtransmission tariffs for the 2011 – 2014 period (i.e., such decree would be effective for the 2011 – 2015 period), and also to extend in one more year the effective date of the tariff setting process for the period 2015 – 2018 (i.e., 2016 – 2019). • On April 22, 2015, the Ministry of Energy published in the Official Gazette, Decree No. 7T, extending the effective date of the subtransmission tariff decree and expressly stating that the tariffs will be applied beginning on January 1, 2016. Notwithstanding, in accordance with Article No. 11 of the transitory provisions of Law No. 20,936, the effective date for Decree No. 14 was extended to December 31, 2017. In relation to the 2016 – 2017 tariff period, on December 29, 2016 it was published Exempted Resolution No. 940, which defined the necessary adjustments to Decree No. 14 to extend its effective date for the years 2016 and 2017. The main adjustment is related to exempt generating power plants from payment for using the Zonal Transmission systems. The 2016 – 2019 tariff setting process will continue is progress, and in accordance with Article No. 11 of the transitory provisions of Law No. 20,936, the results will be used for the tariffs to be applied to the 2018 – 2019 period. On February 10, 2017, the CNE issued Exempted Resolution No. 83, which contained the “Preliminary Technical Report on Determination of the Annual Value of the Zonal Transmission and Dedicated Transmission Systems for the 2018-2019 period”. Enel Distribución, made comments to the report, and the final technical report was issued on March 28, 2017. Following the process steps, Enel Distribución communicated its discrepancies with the final technical report. On May 19, 2017, it was carried out a Public Hearing at which Enel Distribution and other interested parties presented their discrepancies to an Expert Panel. At the reporting date of these interim consolidated financial statements, the tariff decree establishing the new tariffs has not been released. 4.3.4 Distribution-Related Services Tariff Setting On March 14, 2014, the Ministry of Energy published in the Official Gazette, Decree No. 8T, setting the prices for distribution-related services, which are currently still effective. At the end of 2015, the CNE through Exempted Resolution No. 699 communicated, among other matters, the terms for the “Services associated with Energy Distribution Supply Cost Study” as part of the 2016 – 2020 tariff setting process. The terms incorporate five new distribution-related services, of which the most significant are “Construction and installment of temporary junctions” and “Lease of temporary junctions”. On January 20, 2017, it was published the final report on the “Energy Distribution Supply-Related Services Cost Study”. Following the steps of the process, Enel Distribución made comments to the report. Subsequently, on April 27, 2017, the CNE through Exempted Resolution No. 213 approved the Technical Report on “Distribution-Related Services Tariff Setting”. Following the steps of the process, Enel Distribución communicated its discrepancies with the technical report. At the reporting date of these consolidated financial statements, the decree setting new tariffs for distribution-related services has not been released. 4.3.5 Energy Tenders Under the new law for energy tenders, three bidding processes have been carried out: Supply Bidding No. 2015/01, Supply Bidding No. 2015/02 and Supply Tender 2017/01 Supply Bidding No. 2015/01 was launched in May 2015 and finalized in July 2016. The final outcome of the process resulted in five energy blocks awarded for a total of 12,430 GWh to 84 companies at a weighted average price of US$ 47.6 per MWh. Enel Generación Chile was awarded with 5,918 GWh per year, which represented a 47.6% of the total energy awarded. Supply Bidding No. 2015/02 was launched in June 2015 and finalized in October 2015. The final outcome of the process resulted in three energy blocks awarded for a total of 1,200 GWh per year at a weighted average price of US$ 79.3 per MWh, a 30% reduction as compared to the prices of prior bids, which indicates that the amendments to the Electricity Law have effectively reduced the prices through increased competition and a reduction in the risks for generators. Supply Bidding No. 2017/01 was launched in January, 2017 and finalized in November 2017. The final outcome of the process resulted in five energy blocks awarded to five companies for a total of 2,200 GWh per year at a weighted average price of US$ 32.5 per MWh. Enel Generación Chile was awarded with 1.2 TWh per year, which represents 54% of the total energy awarded.

Non-Current Assets or Disposal

Non-Current Assets or Disposal Groups Classified as Held For Sale	12 Months Ended
	Dec. 31, 2017
Disclosure Of Noncurrent Assets And Disposal Groups Classified As Held For Sale [Abstract]
Non-Current Assets or Disposal Groups Classified as Held For Sale	5. NON-CURRENT ASSETS OR DISPOSAL GROUPS CLASSIFIED AS HELD FOR SALE. i. Centrales Hidroeléctricas de Aysén S.A. Enel Generación Chile had a 51% interest in Centrales Hidroeléctricas de Aysén S.A. (hereinafter “Hidroaysén”), whose corporate purpose was to develop, finance, own and exploit a hydroelectric project in Region XI Aysén, Chile. On November 17, 2017, the Board of Directors of Hidroaysén agreed to cease the company’s activities and terminate the Hidroaysén’s electrical project. The decision was made because the forecasted value of the investment in generation and transmission for the electrical project, its related costs and the long-term market prospects indicated that the project was not economically feasible in every possible valuation scenario. Also, the significance amount of the investment and its related risks, both legal and administrative, would add a second uncertainty factor that definitively precluded continuing with the project. On December 7, 2017, at the Extraordinary Shareholders’ Meeting of Hidroysén it was agreed to terminate the company and the liquidation process of the company’s assets. The liquidation process considers the distribution of assets to the shareholders and it is expected to be completed in the first half of 2018. On December 31, 2017, as a result of the above, the investment held by Enel Generación Chile in Hidroaysén comply with the criteria to be classified as a non-current assets or disposal groups classified as held for sale, therefore, as described in note 3.j), it has been recognized at the lower of its carrying amount and fair value less costs to sell. The following table shows the carrying amount of the investment: Equity of Centrales Hidroeléctricas de Aysén S.A. Ownership Interest Carrying Amount of Centrales Hidroeléctricas de Aysén S.A. ThCh$ % ThCh$ 8,245,555 51 % 4,205,233 It is important to note that in 2014, Enel Generación Chile recognized an impairment loss of ThCh$69,066,857 on its investment in Hydroaysén (See note 12.1 – Other information). - Additional financial information on Hidroaysén: Centrales Hidroeléctricas de Aysén S.A. 12/31/2017 ThCh$ Total Current Assets 355,835 Cash and cash equivalents 355,446 Total Non Current Assets 8,030,172 Land 8,030,172 Total Current Liabilities 139,182 Other fixed operating expenses (8,144,855) Interest income 24,829 Profit (loss) (8,193,671) ii. Electrogas S.A. On December 16, 2016, our subsidiary Enel Generación Chile S.A. signed an agreement to sell all shares of its equity method investee Electrogas S.A., equivalent to a 42.5% ownership interest, to Aerio Chile SpA (“Aerio Chile”) which is an indirectly wholly-owned subsidiary of REN – Redes Energéticas Nacionais, S.G.P.S., S.A., under which Enel Generación Chile sold all its shares in Electrogas SA., representing 42.5% of the capital of said company. The total price was USD 180 million, which was paid on the closing date of the referred transaction. Finally, the amount collected was ThCh$115,582,806 and originated a pre-tax gain of ThCh $ 105,311,912 (see notes 6.d and 30, respectively). Electrogas S.A. is a private corporation whose purpose is to provide services of transportation of natural gas and other fuels, on its own and on behalf of third parties. In order to provide its services, it can build, operate and maintain gas and oil pipelines, polyducts and supplementary facilities.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and Cash Equivalents	6. CASH AND CASH EQUIVALENTS. a) The detail of cash and cash equivalents as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Cash and Cash Equivalents ThCh$ ThCh$ Cash balances 53,875 48,002 Bank balances 35,208,300 48,556,736 Time deposits 11,155,249 17,325,478 Other fixed-income instruments 373,038,602 180,068,976 Total 419,456,026 245,999,192 Time deposits have a maturity of three months or less from their date of acquisition and accrue the market interest for this type of short-term investment. Other fixed-income investments are mainly comprised of repurchase agreements with original maturities of less than or equal to 90 days. b) The detail of cash and cash equivalents by currency is as follows: As of December 31, 2017 2016 Currency ThCh$ ThCh$ Chilean peso 399,164,753 235,993,647 Argentine peso 6,263,344 4,807,406 Euros 11,594 — U.S. dollar 14,016,335 5,198,139 Total 419,456,026 245,999,192 c) No payments have been made to obtain control of consolidated entities, as of December 31, 2017. d) The following tables sets forth cash and cash equivalents that have been received from the sale of shares of as of December 31, 2017, 2016 and 2015: As of December 31, 2017 2016 2015 (*) Loss of control at Subsidiaries ThCh$ ThCh$ ThCh$ Amounts received for the sale of subsidiaries — 3,003 25,000,000 Amounts of cash and cash equivalents in entities sold — — (18,360,347) Total net — 3,003 6,639,653 (*) See Note 2.4.1. As of December 31, 2017 (*) 2016 (**) 2015 Loss of control at Associates ThCh$ ThCh$ ThCh$ Amounts received for the sale of Associates 115,582,806 132,820,800 — Total 115,582,806 132,820,800 — (*) See Note 5. (**) See Note 12.b. e) Reconciliation of liabilities arising from financing activities: Liabilities arising from financing activities Balance as of 1/1/2017 (1) Financing Cash Flows Non-Cash Changes Balance as of 12/31/2017 (1) From Used Interest paid Total Changes in fair value Foreign exchange differences Financial costs (2) Other changes ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Bank loans (Note 18.1) 4,274 — (4,156 ) (12,581 ) (16,737 ) — — 12,585 — 122 Unsecured obligations (Note 18.1) 802,306,161 — (5,530,327 ) (43,514,578 ) (49,044,905 ) — (33,226,098 ) 43,544,427 — 763,579,585 Finance leases (Note 18.1) 17,749,647 — (2,592,236 ) — (2,592,236 ) — (1,359,668 ) 811,171 — 14,608,914 Financial derivatives for hedging (Note 7 y 18) 23,640,892 — (3,543,399 ) — (3,543,399 ) (25,059,561 ) (23,488,917 ) 3,473,938 (4,501,595 ) (29,478,642 ) Loans to related parties — 150,000,000 (150,000,000 ) (289,800 ) (289,800 ) — — 289,800 — — Other obligations — — (1,305,389 ) — (1,305,389 ) — — 1,305,389 — — Total 843,700,974 150,000,000 (162,975,507 ) (43,816,959 ) (56,792,466 ) (25,059,561 ) (58,074,683 ) 49,437,310 (4,501,595 ) 748,709,979 (1) Balance corresponds to current and non-current portion. (2) Other changes include interest accruals

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Financial Assets [Abstract]
Other Financial Assets	7. OTHER FINANCIAL ASSETS. The detail of other financial assets as of December 31, 2017 and 2016, is as follows: Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Other Financial Assets ThCh$ ThCh$ ThCh$ ThCh$ Available-for-sale financial investments – unquoted equity securities or with limited liquidity — — 2,595,343 2,616,239 Available-for-sale financial investments – quoted equity Securities — — 33,158 25,381 Financial assets held to maturity (*) 185,913 462,801 — 652,733 Hedging derivatives 20,038,433 121,443 30,789,703 25,533,189 Non-Hedging derivatives 402,716 — — — Total 20,627,062 584,244 33,418,204 28,827,542 (*) See Note 20.1.a The amounts included in “financial assets held to maturity” correspond mainly to time deposits and other highly liquid investments that are readily convertible to cash and subject to a low risk of changes in value, but that do not fulfill the definition of cash equivalent as defined in Note 3.g.2 (e.g. with maturity over 90 days from time of investment).

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2017
Disclosure Of Trade And Other Receivables [Abstract]
Trade and Other Receivables	8. TRADE AND OTHER RECEIVABLES. a) The detail of trade and other receivables as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Trade and Other Receivables, Gross ThCh$ ThCh$ ThCh$ ThCh$ Trade and other receivables, gross 463,626,345 36,182,399 484,533,736 33,500,105 Trade receivables, gross (2) 415,039,522 1,917,828 414,184,116 8,369,878 Other receivables, gross (1) 48,586,823 34,264,571 70,349,620 25,130,227 As of December 31, 2017 2016 Current Non-current Current Non-current Trade and Other Receivables, Net ThCh$ ThCh$ ThCh$ ThCh$ Trade and other receivables, net 419,752,286 36,182,399 445,071,856 33,500,105 Trade and other receivables, net (2) 380,379,326 1,917,828 382,487,300 8,369,878 Other receivables, net (1) 39,372,960 34,264,571 62,584,556 25,130,227 (1) As of December 31, 2017, it mainly includes accounts receivable related to loan and advances to employees for ThCh$9,709,051 (ThCh$11,167,266 as of December 31, 2016); recoverable taxes (VAT) for ThCh$18,318,007 (ThCh$18,658,849 as of December 31, 2016); recoverable taxes in Peru of ThCh$0 (ThCh$15,035,980 as of December 31, 2016); payments in advance to suppliers for ThCh$5,360,307 (ThCh$4,804,161 as of December 31, 2016); lease receivables for ThCh$34,550,131 (ThCh$23,296,966 as of December 31, 2016) and other miscellaneous receivables for ThCh$5,700,035 (ThCh$8,266,102 as of December 31, 2016) (2) As of December 31, 2017, our subsidiary Enel Distribución Chile S.A. recognized unbilled revenue and trade and other accounts receivable for the difference between current and effective Average Node Prices and Short Term Node Prices for ThCh$4,117,611 (ThCh$8,581,761 as of December 31, 2016) to be billed and charge to regulated end-customers. There are no significant trade and other receivables balances held by the Group that are not available for its use. The Group does not have customers with sales representing 10% or more of its total consolidated revenues for the years ended December 31, 2017, 2016 and 2015. Refer to Note 9.1 for detailed information on amounts, terms and conditions associated with accounts receivable from related parties. b) Lease receivables As of December 31, 2017 and 2016, the present value of minimum lease payments receivable is as follows: 12-31-2017 12-31-2016 Gross Interest Present Value Gross Interest Present Value ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Less than one year 4,380,499 944,578 3,435,921 2,807,385 696,299 2,111,086 From one to five years 17,521,998 3,617,167 13,904,831 10,011,194 1,461,944 8,549,250 More than five years 18,127,398 918,019 17,209,379 15,021,707 2,385,077 12,636,630 Total 40,029,895 5,479,764 34,550,131 27,840,286 4,543,320 23,296,966 Lease arrangements are related to public lightning developments mainly to municipalities. c) As of December 31, 2017 and 2016, the balance of past due but not impaired trade receivables is as follows Trade Receivables Past Due But Not Impaired (*) As of December 31, 2017 2016 ThCh$ ThCh$ Less than three months 54,488,473 52,259,795 Between three and six months 9,008,195 10,795,139 Between six and twelve months 7,123,391 15,842,450 More than twelve months 16,067,867 23,338,216 Total 86,687,926 102,235,600 (*) These balances correspond to non-impaired past due accounts and the portion does not affect the provision of other accounts due receivable. d) The reconciliation of changes in the allowance for impairment of trade receivables is as follows: Current and Non-current Trade Receivables Past Due and Impaired ThCh$ Balance at December 31, 2015 35,877,490 Increases (decreases) for the year (*) 5,141,179 Amounts written off (1,556,789 ) Balance at December 31, 2016 39,461,880 Increases (decreases) for the year (*) 7,937,817 Amounts written off (3,525,638 ) Balance at December 31, 2017 43,874,059 (*) See Note 28 for impairment of financial assets. Write-offs for past due receivables Past due receivables are written off once all collection procedures and legal proceedings have been exhausted and the debtors’ insolvency has been demonstrated. In our power generation business, this process normally takes at least one year. In our distribution business the process takes at least twenty four months. Overall, the risk of writing off our trade receivables is limited (See Notes 3.g.3, 19.5 and Appendices 6 and 6.1). e) Additional information: - Additional statistical information required under Official Bulletin 715 of the CMF, of February 3, 2012 (XBRL Taxonomy). See Appendix 6. - Supplementary information on trade receivables. See Appendix 6.1.

Balances and Transactions With

Balances and Transactions With Related Parties	12 Months Ended
	Dec. 31, 2017
Disclosure Of Transactions Between Related Parties [Abstract]
Balances and Transactions With Related Parties	9. BALANCES AND TRANSACTIONS WITH RELATED PARTIES. Related party transactions are performed at current market conditions. Transactions between the Group and its subsidiaries, associates and joint ventures have been eliminated on consolidation and are not itemized in this note. As of the date of these financial statements, no guarantees have been given or received nor has any allowance for bad or doubtful accounts been recorded with respect to receivable balances for related party transactions. The controlling shareholder of the Company is the Italian corporation Enel S.p.A. 9.1 Balances and transactions with related parties The balances of accounts receivable and payable between the Group and its non-consolidated related companies are as follows: a) Receivables from related parties Taxpayer ID Current Non-current Number Company Country Relationship Currency Description of transaction Term of transaction 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ThCh$ ThCh$ ThCh$ ThCh$ Foreign Endesa España Spain Common Immediate Parent CH$ Other services Less than 90 days 70,371 83,448 — — Foreign Endesa España Spain Common Immediate Parent Euros Other services Less than 90 days 13,077 — — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 1,031,125 129,755 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 79,217 57,827 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 86,089 — — — 96.880.800-1 Empresa Electrica Puyehue S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 0 64 — — 76.418.940-k GNL Chile S.A. Chile Associate CH$ Advance natural gas purchase Less than 90 days 18,793,098 16,780,275 — — Foreign Endesa Generación Spain Common Immediate Parent Euros Other services Less than 90 days 36,067 36,067 — — Foreign Endesa Generación Spain Common Immediate Parent US$ Commodity derivatives Less than 90 days — 587,224 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent CH$ Other services Less than 90 days 8,144 8,144 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent Euros Other services Less than 90 days 290,838 278,834 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 8,511 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 21,484,590 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Commodity derivatives Less than 90 days 20,751,714 22,321,017 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 16,994 142,926 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Tolls Less than 90 days 134 8 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Other services Less than 90 days 49,677 — — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 50,594 98,353 — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 35,572 21,774 — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Other services Less than 90 days 19,877 — — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 41,487 243,946 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 425 — — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 54,638 — — — Foreign Enel SpA Italy Parent CH$ Other services Less than 90 days 157,701 194,879 — — Foreign Enel SpA Italy Parent Euros Other services Less than 90 days 215,289 145,858 — — 76.052.206-6 Parque Eolico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 75,956 81,377 — — 76.052.206-6 Parque Eolico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 49,677 — — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 28,835 25,559 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 3,443 — — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Other services Less than 90 days 310,179 — — — 96.210.110-10 Enel Green Power Chile S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 162,594 34,851 — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent CH$ Other services Less than 90 days 47,998 2,121,609 — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent Euros Other services Less than 90 days 116,436 — — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent US$ Other services Less than 90 days 2,068,594 36,276 — — 76.532.379-7 Chilectra Inversud Chile Common Immediate Parent CH$ Other services Less than 90 days — 150,246 — — Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent CH$ Other services Less than 90 days — 1,614,168 — — Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent CH$ Other services Less than 90 days 432,233 — — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CH$ Other services Less than 90 days 29,989 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days 13,746 — — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days — 13,327 — — Foreign Codensa S.A. Colombia Common Immediate Parent CH$ Other services Less than 90 days 791,622 423,462 — — Foreign Codensa S.A. Colombia Common Immediate Parent Euros Other services Less than 90 days 29,221 — — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days 15,192 1,328,268 — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent US$ Other services Less than 90 days 758,841 — — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent PS$ Other services Less than 90 days — 15,192 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Mercantile current account Less than 90 days — 519,570 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 1,487,709 2,356,523 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 54,949 — — — Foreign Enel Green Power Colombia SAS Colombia Common Immediate Parent CH$ Other services Less than 90 days 46,557 — — — Foreign Enel Generación Piura S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days — 346,061 — — Foreign Enel Generación Piura S.A. Peru Common Immediate Parent US$ Other services Less than 90 days 165,875 — — — Foreign Enel Perú S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days — 341,948 — — Foreign Compañía Energética Veracruz S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days 639,233 — — Foreign Chinango S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days 17,410 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent CH$ Other services Less than 90 days 262,694 — — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent US$ Other services Less than 90 days 82,830 — — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent CH$ Energy sales Less than 90 days 10,096 — — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days 354,283 1,251,369 — — Foreign Enel Green Power Mexico Mexico Common Immediate Parent US$ Other services Less than 90 days 152,495 — — — Foreign Enel Green Power Perú Peru Common Immediate Parent US$ Other services Less than 90 days 177,478 — — — Foreign Enel Green Power Brasil Brazil Common Immediate Parent US$ Other services Less than 90 days 37,936 — — — Foreign Enel Green Power Brasil Participacoes LTDA Brazil Common Immediate Parent US$ Other services Less than 90 days 9,188 — — — Foreign Empresa Distribuidora del Sur S.A. Argentina Common Immediate Parent CH$ Other services Less than 90 days 796,750 398,957 — — Total 71,856,046 52,858,384 — — b) Accounts payable to related parties Taxpayer ID Current Non-current Number Company Country Relationship Currency Description of transaction Terms of transaction 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ThCh$ ThCh$ ThCh$ ThCh$ Foreign Endesa España Spain Common Immediate Parent CH$ Other services Less than 90 days — 273,569 — — Foreign Endesa España Spain Common Immediate Parent Euros Other services Less than 90 days 277,868 — Foreign Enel Brasil Brazil Common Immediate Parent US$ Other services Less than 90 days 77,680 — — — Foreign Enel Brasil Brazil Common Immediate Parent CH$ Other services Less than 90 days — 85,864 — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent US$ Other services Less than 90 days — 63,992 — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent AR$ Other services Less than 90 days 74,740 — — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent CH$ Other services Less than 90 days — 13,574 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent US$ Other services Less than 90 days — 5,461 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days 4,551 — — — 94.271.000-2 Enel Américas Chile Common Immediate Parent CH$ Loan Less than 90 days 4,650 974,374 — — 94.271.000-2 Enel Américas Chile Common Immediate Parent US$ Other services Less than 90 days 912,731 — — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent US$ Other services Less than 90 days — 2,239 — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent PS$ Other services Less than 90 days 2,110 — — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 3,175,956 1,695,658 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 71,648 92,005 — — 96.806.130-5 Electrogas S.A. Chile Associate CH$ Tolls Less than 90 days — 331,447 — — 76.418.940-k GNL Chile S.A. Chile Associate US$ Gas Purchase Less than 90 days 8,100,426 4,872,264 — — Foreign Endesa Generación Spain Common Immediate Parent CH$ Coal Purchase Less than 90 days — 486,180 — — Foreign Endesa Generación Spain Common Immediate Parent CH$ Other services Less than 90 days 22,257 379,731 — — Foreign Endesa Generación Spain Common Immediate Parent Euros Other services Less than 90 days 214,667 — — — Foreign Enel Iberoamérica S.R.L Spain Parent Euros Other services Less than 90 days 749,834 158,909 — — Foreign Enel Iberoamérica S.R.L Spain Parent CH$ Dividends Less than 90 days — 57,755,885 — — Foreign Enel Iberoamérica S.R.L Spain Parent CH$ Other services Less than 90 days 35 867,838 — — Foreign Enel Distribuzione Italy Common Immediate Parent Euros Other services Less than 90 days 3,187,971 705,730 — — Foreign Enel Produzione Italy Common Immediate Parent Euros Other services Less than 90 days 10,501,963 118,261 318,518 — Foreign Enel Produzione Italy Common Immediate Parent CH$ Other services Less than 90 days — 483,665 — — Foreign Enel Ingegneria e Ricerca Italy Common Immediate Parent CH$ Other services Less than 90 days — 6,343,845 — 251,527 Foreign Enel Energía Italy Common Immediate Parent CH$ Other services Less than 90 days 348,370 163,911 — — 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 371,339 379,716 — — 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent CH$ Tolls Less than 90 days 64,484 45,153 — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint Venture CH$ Tolls Less than 90 days 72,965 332,709 — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint Venture CH$ Energy purchase Less than 90 days 70,984 — — — 76.126.507-5 Parque Eólico Talinay Oriente SA Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 65,829 48,434 — — 76.126.507-5 Parque Eólico Talinay Oriente SA Chile Common Immediate Parent CH$ Tolls Less than 90 days 258 301 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent CH$ Other services Less than 90 days — 589,896 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 924,051 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Commodity derivatives Less than 90 days 4,184,469 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent CH$ Commodity derivatives Less than 90 days — 1,103,206 — — 76.179.024-2 Parque Eólico Tal S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 2,105,042 2,171,864 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 484 333 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 10,323,531 7,406,880 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Other services Less than 90 days — 87,448 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 853 42,901 — — 96.920.110-0 Enel Green Power Chile Ltda. Chile Common Immediate Parent CH$ Other services Less than 90 days 90,134 — — — Foreign Enel S.p.A. Italy Parent CH$ Other services Less than 90 days — 120,296 — — Foreign Enel S.p.A. Italy Parent Euros Other services Less than 90 days 77,415 — — — Foreign Enel S.p.A. Italy Parent CH$ Dividends Less than 90 days 63,543,371 — — — Foreign Enel S.p.A. Italy Parent Euros Other services Less than 90 days 1,583,058 564,764 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days — 477 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 1,261,153 — — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent CH$ Other services Less than 90 days — 1,660,149 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent Euros Other services Less than 90 days 4,591,580 — — — Foreign Enel Italia Italy Common Immediate Parent Euros Other services Less than 90 days 2,089,122 — — — Foreign Codensa Colombia Common Immediate Parent US$ Other services Less than 90 days 7,936 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent CH$ Other services Less than 90 days 357,579 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent Euros Other services Less than 90 days 99,878 — — — Total 119,612,972 90,428,929 318,518 251,527 c) Significant transactions and effects on income/expenses: Transactions with related companies that are not consolidated and their effects on profit or loss are as follows: } For the years ended December 31, Taxpayer ID Number Company Country Relationship Description of transaction 2017 2016 2015 ThCh$ ThCh$ ThCh$ Foreign Endesa Energía S.A. Spain Common Immediate Parent Other operating income — — 232,867 Foreign Endesa Energía S.A. Spain Common Immediate Parent Gas Sales 10,394,146 18,655,911 14,604,841 Foreign Endesa Energía S.A. Spain Common Immediate Parent Fuel consumption — (134,393 ) (10,451,242 ) Foreign Enel Latonoamérica Spain Common Immediate Parent Interests financial debt — — (18,684 ) Foreign Endesa Generación Spain Common Immediate Parent Fuel consumption — (54,818,466 ) (15,030,911 ) Foreign Endesa Generación Spain Common Immediate Parent Other fixed operating expenses — — (23,329 ) Foreign Endesa Generación Spain Common Immediate Parent Commodity derivatives — — (2,144,063 ) Foreign Generalima S.A.C. Peru Common Immediate Parent Other services rendered — — — Foreign Enel Perú S.A.C Peru Common Immediate Parent Other services rendered 7,405 68,066 — Foreign Enel Perú S.A.C Peru Common Immediate Parent Financial expenses (181 ) — — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other financial expense — — (4,709,312 ) 94.271.000-3 Enel Américas Chile Common Immediate Parent Financial expenses (289,800 ) (1,933,040 ) — 94.271.000-3 Enel Américas Chile Common Immediate Parent Financial income 144,404 540,259 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other services rendered 4,737,522 4,822,344 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other variable expenses — (352 ) — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other operating income — 182,091 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other fixed operating expenses — (1,546,751 ) — Foreign Codensa S.A. Colombia Common Immediate Parent Other operating income — (709 ) — Foreign Codensa S.A. Colombia Common Immediate Parent Other services rendered 399,432 141,664 — Foreign Enel Brasil Brazil Common Immediate Parent Other fixed operating expenses — (35,949 ) — Foreign Enel Brasil Brazil Common Immediate Parent Other services rendered — 2,044,935 — 76.418.940-k GNL Chile S.A. Chile Associate Gas consumption (146,507,390 ) (102,686,858 ) (123,964,573 ) 76.418.940-k GNL Chile S.A. Chile Associate Gas transportation (47,656,002 ) (40,494,275 ) (52,195,582 ) 76.418.940-k GNL Chile S.A. Chile Associate Other services rendered 85,274 82,762 54,377 76.418.940-k GNL Chile S.A. Chile Associate Other operating income — (1,539 ) 81,749 76.788.080-4 GNL Quintero S.A. Chile Associate Energy sales — 1,912,448 3,260,734 76.788.080-4 GNL Quintero S.A. Chile Associate Electricity tolls — 79,203 151,088 76.788.080-4 GNL Quintero S.A. Chile Associate Other services rendered — 960,390 650,390 Foreign Endesa Cemsa S.A. Argentina Common Immediate Parent Other fixed operating expenses — — (11,862 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Energy purchases (11,758,824 ) (8,803,274 ) (10,597,853 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Electricity tolls (254,065 ) (235,950 ) (294,910 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Other services rendered 415,162 281,190 392,168 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Energy sales 1,242,092 116,726 286,977 Foreign Empresa Distribuidora del Sur S.A. Argentina Common Immediate Parent Other services rendered 409,823 398,957 — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent Other services rendered 176,867 70,415 — Foreign Enel Iberoamérica S.R.L Spain Parent Other fixed operating expenses — — (402,833 ) Foreign Enel Iberoamérica S.R.L Spain Parent Other fixed operating expenses (6,085 ) — — 96.806.130-5 Electrogas S.A. Chile Associate Gas tolls (251,099 ) (2,750,858 ) (3,296,951 ) 96.806.130-5 Electrogas S.A. Chile Associate Fuel consumption (25,025 ) (717,599 ) (952,044 ) Foreign Emgesa S.A.E.S.P Colombia Common Immediate Parent Other operating income 1,866 (2,645 ) — Foreign Enel Argentina S.A. Argentina Common Immediate Parent Other fixed operating expenses — (970 ) — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other services rendered — (96,109 ) — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other operating income 745,818 — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Financial expenses (349 ) — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other operating income — (9,253 ) — Foreign Enel Generacion Piura S.A. Peru Common Immediate Parent Other services rendered 98,421 168,961 — Foreign Enel Generacion Piura S.A. Peru Common Immediate Parent Financial expenses (135 ) — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint venture Electricity tolls (1,383,710 ) (1,291,995 ) (1,473,974 ) 99.573.910-0 Chilectra Inversud S.A. Chile Common Immediate Parent Other operating income — 637 — 76.532.379-7 Chilectra Américas S.A. (*) Chile Common Immediate Parent Other services rendered — 289,994 686,249 76.532.379-7 Chilectra Américas S.A. (*) Chile Common Immediate Parent Other financial expense — (375,037 ) 76.536.351-9 Endesa Américas S.A. (*) Chile Common Immediate Parent Other services rendered — 1,260,448 343,881 Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent Other services rendered 6,629 425,604 1,188,564 Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent Financial expenses (162,177 ) — — Foreign Compañía Energética Veracruz S.A.C. Peru Common Immediate Parent Other services rendered 283,346 42,890 — Foreign Enel Trade S.p.A Italy Common Immediate Parent Commodity derivatives 19,941,617 — (833,366 ) Foreign Enel Trade S.p.A Italy Common Immediate Parent Other fixed operating expenses — — (216,437 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Energy purchases (4,306,145 ) (3,674,821 ) (3,264,764 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Electricity tolls (212,402 ) (188,859 ) (153,929 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Other services rendered 40,643 152,419 109,891 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Energy sales 344,090 64,174 87,062 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Energy purchases (16,630,422 ) (11,992,799 ) (14,929,463 ) 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Other services rendered 101,595 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Energy sales 144,589 558,966 670,035 Foreign Enel SpA Italy Parent Other fixed operating expenses (658,611 ) (34,700 ) — Foreign Enel Italia Servizi Italy Common Immediate Parent Other fixed operating expenses (2,230,668 ) (1,547,695 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Energy purchases (104,865,684 ) (34,952,571 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Energy sales 528,740 48,322 — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Electricity tolls 3,730 (2,323 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Other services rendered 634,361 15 — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Energy purchases (25,959,608 ) (22,415,584 ) (26,456,188 ) 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Electricity tolls 250 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Other services rendered 111,748 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Energy sales 109,643 23,932 217,448 96.920.110-0 Enel Green Power Chile Ltda. Chile Common Immediate Parent Other services rendered 162,848 34,855 — Foreign Enel Produzione Italy Common Immediate Parent Other fixed operating expenses 94,045 — (206,912 ) Foreign Enel Distribuzione Italy Common Immediate Parent Other fixed operating expenses — (654,622 ) — Foreign Enel Energy Europe Italy Common Immediate Parent Other services rendered — — (69,202 ) Foreign Enel Ingegneria e Innovazione Italy Common Immediate Parent Other services rendered — 30,806 35,773 Foreign Enel Ingegneria e Innovazione Italy Common Immediate Parent Other fixed operating expenses — (328,310 ) (1,354,650 ) 76.652.400-1 Centrales Hidroeléctricas de Aysén S.A. Chile Joint venture Other services rendered — — 260,275 Foreign Enel Global Trading S.p.A Italy Common Immediate Parent Other operating income — 9,191,693 — Foreign Enel Global Trading S.p.A Italy Common Immediate Parent Other variable expenses — (2,120,323 ) — Foreign Enel Trading Argentina S.r.L. Argentina Common Immediate Parent Other services rendered 11,488 — — Foreign Enel Green Power Italia Italy Common Immediate Parent Other fixed operating expenses 262,694 — — Foreign Enel Green Power Perù Peru Common Immediate Parent Other services rendered 177,478 — — Foreign Enel Green Power Brasil Brazil Common Immediate Parent Other services rendered 37,936 — — Foreign Enel Green Power Brasil Participacoes LTDA Brazil Common Immediate Parent Other services rendered 9,188 — — Foreign Enel Green Power Mexico Mexico Common Immediate Parent Other services rendered 152,495 — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Energy purchases (456 ) — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Energy sales 10,552 — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Other services rendered 69,605 — — Foreign Chinango S.A.C Peru Common Immediate Parent Other services rendered 18,516 — — Foreign Enel Green Power Colomboa SAS Colombia Common Immediate Parent Other services rendered 46,557 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Energy sales 128,626 89,710 153,158 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Electricity tolls 144 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Other services rendered 101,595 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Energy purchases (539,646 ) (370,964 ) (505,404 ) Total (321,305,504 ) (251,103,769 ) (250,465,948 ) (*) Entities merged with and into Enel Américas S.A. Transfers of short-term funds between related companies are treated as current accounts changes, with variable interest rates based on market conditions used for the monthly balance. The resulting receivable or payable balances are usually at 30 days term, with automatic rollover for the same periods and amortization in line with cash flows. 9.2 Board of Directors and Key management personnel The Company is managed by a Board of Directors which consists of seven members. Each director serves for a three-year term after which they can be reelected. The Board of Directors as of December 31, 2017, was elected at the Ordinary Shareholders Meeting held on April 28, 2016. At the Board of Directors Meeting held on April 29, 2016 the current Chairman and Vice Chairman were designated. a) Account receivable and payable and other transactions • Accounts receivable and payable There are no outstanding amounts receivable or payable between the Company and the members or the Board of Directors and key management personnel. • Other transactions No transactions other than the payment of compensation have taken place between the Company and the members of the Board of Directors and key management personnel and other than transactions in the normal course of business-electricity supply. b) Compensation for directors In accordance with Article 33 of Law No. 18,046 governing shock corporations, the compensation of Directors is established each year at the Ordinary Shareholders Meeting of the Company. The compensation consists of paying a variable annual compensation equal to one one-thousandth of the profit for the year (attributable to shareholders of Enel Chile). Also, each member of the Board will be paid a monthly compensation, one part a fixed monthly fee and another part dependent on meetings attended. The breakdown of this compensation is as follows: -UF 180 as a fixed monthly fee; and -UF 66 as per diem for each Board meeting attended, all with a maximum of fifteen sessions in total, be ordinary or extraordinary in the corresponding year. The amounts paid for the monthly fee will be treated as payment in advance of the variable annual compensation described above. As stated in the by-laws, the compensation for the Chairman of the Board will be the double that of a Director. Any advance payments received will be deducted from the annual variable compensation, with no reimbursement if the annual variable compensation is lower than the total amount paid in advances. The variable compensation will be paid, when appropriate, after the Ordinary Shareholders’ Meeting approves the Annual Report, Balance Sheet and Financial Statements, and the Independent Auditors’ Reports and Account Inspectors’ Reports for the year ended December 31, 2017. If any Director of the Company is a member of more than one Board in any Chilean or foreign subsidiaries and/or associates, or holds the position of director or advisor in other Chilean or foreign companies or legal entities in which Enel Chile S.A. has a direct or indirect ownership interest, that Director can be compensated for his/her participation in only one of those Boards or Management Committees. The Executive Officers of the Company and/or any of its Chilean or foreign subsidiaries or associates will not receive any compensation or per diem if they hold the position of director in any of the Chilean or foreign subsidiaries or associates of the Company. Nevertheless, the executives may receive such compensation or per diem, provided there is prior express authorization, as a payment in advance of the variable portion of their compensation received from the respective companies through which they are employed. Directors’ Committee: Each member of the Directors’ Committee will receive a variable compensation equal to 0.11765 thousandth of the profit for the year (attributable to shareholders of Enel Chile S.A.). Also each member will be paid a monthly compensation, one part in a fixed monthly fee and another part dependent on meetings attended. This compensation is broken down as follows: - UF 60.00 as a fixed monthly fee, and - UF 22.00 as per diem for each Board meeting attended, all with a maximum of fifteen sessions in total, whether ordinary or extraordinary, in the corresponding year. The amounts paid for the monthly fee will be treated as payment in advance of the variable annual compensation described above. Any advance payments received will be deducted from the annual variable compensation, with no reimbursement if the annual variable compensation is lower than the total amount paid in advances. The variable compensation will be paid, when appropriate, after the Ordinary Shareholders’ Meeting approves the Annual Report, Balance Sheet and Financial Statements, and the Independent Auditors’ Reports and Account Inspectors’ Reports for the year ended December 31, 2017. The following tables show details of the compensation paid to the members of the Board of Directors of the Company for the year ended December 31, 2017: December 31, 2017 Enel Chile Board Board of subsidiaries Directors' Committee Taxpayer ID No. Name Position Period in position ThCh$ ThCh$ ThCh$ 4.975.992-4 Hermán Chadwick Piñera Chairman January - December 2017 178,065 — — Foreigner Giulio Fazio Vice Chairman January - December 2017 — — — 4.461.192-9 Fernán Gazmuri Plaza Director January - December 2017 89,032 — 28,504 4.774.797-K Pedro Pablo Cabrera Gaete Director January - December 2017 89,032 — 28,504 5.672.444-3 Juan Gerardo Jofré Miranda Director January - December 2017 89,032 — 28,504 Foreigner Vicenzo Ranieri Director January - December 2017 — — — Foreigner Salvatore Bernabei Director January - December 2017 — — — Total 445,161 — 85,512 December 31, 2016 Enel Chile Board Board of subsidiaries Directors' Committee Taxpayer ID No. Name Position Period in position ThCh$ ThCh$ ThCh$ 4.975.992-4 Hermán Chadwick Piñera Chairman March - December 2016 129,578 — — Foreigner Giulio Fazio Vice Chairman March - December 2016 — — — 4.461.192-9 Fernán Gazmuri Plaza Director March - December 2016 80,864 — 25,250 4.774.797-K Pedro Pablo Cabrera Gaete Director March - December 2016 80,864 — 25,250 5.672.444-3 Juan Gerardo Jofré Miranda Director March - December 2016 80,864 — 25,250 Foreigner Vicenzo Ranieri Director March - December 2016 — — — Foreigner Salvatore Bernabei Director March - December 2016 — — — Total 372,170 — 75,750 c) Guarantees given by the Company in favor of the directors No guarantees have been given in favor of the directors. 9.3 Compensation for key management personnel a) Compensation received by key management personnel Key Management Personnel Taxpayer ID No. Name Position Foreigner Nicola Cotugno (1) Chief Executive Officer 24.950.967-1 Raffaele Grandi Administration, Finance and Control Officer 15.307.846-7 Jose Miranda Montecinos Communications Officer 24.166.243-8 Alain Rosolino (2) Human Resources and Organization Officer 6.973.465-0 Domingo Valdés Prieto General Counsel and Secretary to the Board Foreigner Raffael Cutrignelli (3) Internal Audit Officer 11.625.161-2 Pedro Urzúa Frei Institutional Relations Officer Foreigner Bruno Stella (4) Planning and control Officer 7.006.337-9 Francisco Silva Bafalluy Servi

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Classes Of Inventories [Abstract]
Inventories	10. INVENTORIES. The detail of inventories as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Classes of Inventories ThCh$ ThCh$ Supplies for Production 16,879,260 12,377,179 Gas 2,301,172 2,159,901 Oil 2,593,806 2,556,438 Coal 11,984,282 7,660,840 Other inventories (*) 22,807,682 25,162,417 Total 39,686,942 37,539,596 (*) Other inventories 22,807,682 25,162,417 Supplies for projects and spare parts 12,311,718 17,076,698 Electrical materials 10,495,964 8,085,719 There are no inventories pledged as security for liabilities. For the years ended December 31, 2017, 2016 and 2015, raw materials and consumables recognized as fuel expenses were ThCh$280,739,362, ThCh$295,148,838 and ThCh$327,502,996, respectively, See Note 26. As of December 31, 2017, no inventories have been written down due to obsolescence.

Current Tax Assets and Liabilit

Current Tax Assets and Liabilities	12 Months Ended
	Dec. 31, 2017
Disclosure Of Current Tax Assets And Liabilities [Abstract]
Current Tax Assets and Liabilities	11. CURRENT TAX ASSETS AND LIABILITIES. The detail of current tax assets and liabilities as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Tax Receivables ThCh$ ThCh$ Monthly provisional tax payments 63,942,847 43,862,763 Tax credit for absorbed profits 13,433,962 11,398,609 Tax credit for training expenses 261,000 241,700 Other 118,239 146,099 Total 77,756,048 55,649,171 As of December 31, 2017 2016 Tax Payables ThCh$ ThCh$ Income tax 67,027,507 61,599,415 Total 67,027,507 61,599,415

Investments Accounted for Using

Investments Accounted for Using the Equity Method	12 Months Ended
	Dec. 31, 2017
Disclosure Of Investments Accounted For Using Equity Method [Abstract]
Investments Accounted for Using the Equity Method	12. INVESTMENTS ACCOUNTED FOR USING THE EQUITY METHOD. 12.1. Investments accounted for using the equity method a. The following tables present the changes in investments in associates and joint ventures accounted for using the equity method as of December 31, 2017 and 2016: Balance as of Share of Profit Dividends Foreign Currency Other Comprehensive Other Increase Balance as of Taxpayer ID Number Associates and Joint Ventures Country Currency Ownership Interest 01-01-2017 ThCh$ Additions ThCh$ (Loss) ThCh$ Declared ThCh$ Translation ThCh$ Income ThCh$ (Decrease) ThCh$ 12-31-2017 ThCh$ 76.418.940-K GNL Chile S.A. Chile U.S. dollar 33.33 % 3,982,934 — 841,957 (743,734 ) (297,841 ) — — 3,783,316 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. (*) Chile Chilean peso 51.00 % 6,441,166 1,943,100 (4,179,033 ) — — — (4,205,233 ) — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Chilean peso 50.00 % 8,222,763 — 595,996 — — — — 8,818,759 Foreign Enel Argentina S.A. Argentina Argentine peso 0.12 % 91,335 — 44,176 — (29,198 ) (1,490 ) 323 105,146 TOTAL 18,738,198 1,943,100 (2,696,904 ) (743,734 ) (327,039 ) (1,490 ) (4,204,910 ) 12,707,221 Balance as of Share of Profit Dividends Foreign Currency Other Comprehensive Other Increase Balance as of Taxpayer ID Number Associates and Joint Ventures Country Currency Ownership Interest 01-01-2016 ThCh$ Additions ThCh$ (Loss) ThCh$ Declared ThCh$ Translation ThCh$ Income ThCh$ (Decrease) ThCh$ 12-31-2016 ThCh$ 96.806.130-5 Electrogas S.A. (*) Chile U.S. dollar 42.50 % 12,042,873 — 5,166,226 (3,979,095 ) (844,372 ) 607,375 (12,993,007 ) — 76.788.080-4 GNL Quintero S.A. (**) Chile U.S. dollar 20.00 % 17,137,023 — 2,750,075 (2,598,035 ) (816,094 ) (12,298,165 ) (4,174,804 ) — 76.418.940-K GNL Chile S.A. Chile U.S. dollar 33.33 % 2,662,029 — 1,491,025 — (170,120 ) — — 3,982,934 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. Chile Chilean peso 51.00 % 6,280,293 2,346,000 (2,185,127 ) — — — — 6,441,166 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Chilean peso 50.00 % 7,594,153 — 628,610 — — — — 8,222,763 Foreign Enel Argentina S.A. Argentina Argentine peso 0.12 % — 235,090 23,610 — (21,044 ) (656 ) (145,665 ) 91,335 Foreign Southern Cone S.A. Argentina Argentine peso 2.00 % — 3,326 3,780 — (1,080 ) (63 ) (5,963 ) — TOTAL 45,716,371 2,584,416 7,878,199 (6,577,130 ) (1,852,710 ) (11,691,509 ) (17,319,439 ) 18,738,198 (*) See Note 5. (**) See Note 12.1.b. b. Sale GNL Quintero S.A. On June 9, 2016, the Company entered into a share purchase agreement with Enagás Chile S.p.A. (“Enagás Chile”), a wholly-owned subsidiary of Enagás S.A., under which Enagás Chile would acquire the entire 20% ownership interest held by the Company in the associated company GNL Quintero S.A. The sale of this investment to Enagás Chile was subject to satisfaction of customary conditions precedent for this type of transaction, which included, among others, non-exercising by the other shareholders of GNL Quintero S.A. of the preferential acquisition rights, which they possess in accordance with the terms and conditions of the shareholders agreement. On September 14, 2016, upon satisfaction of the conditions precedent, the Company transferred the shares it held in GNL Quintero S.A. to Enagás Chile. The total sale price was US$197,365,113.2 (ThCh$132,820,800). Cash received for GNL Quintero S.A. is included in “Other collections from the sale of equity or debt instruments belonging to other entities” in the Consolidated Statements of Cash Flows. Also see Note 30 for the net financial result of the transaction. GNL Quintero S.A. operates a storage and regasification of Liquefied Natural Gas (LNG) plant and its related land-based Terminal for loading and unloading LNG, including facilities and network necessary to deliver LNG, through a LNG truck loading facility and delivery point’s pipelines. c. Other information Centrales Hidroeléctricas de Aysén S.A. In May 2014, the Committee of Ministers revoked the Environmental Qualification Resolution (“RCA”) of the Centrales Hidroeléctricas de Aysén S.A. project, in which the Company participates by accepting some of the claims filed against this project. It is a public information that this decision was resorted before the Environmental Courts in Valdivia and Santiago. On January 28, 2015, it was made public that the water rights request made by Centrales Hidroeléctricas de Aysén S.A. has been partially rejected in 2008. The Company has expressed its intention to promote at Centrales Hidroeléctricas de Aysén S.A. the defense for water rights and the environmental qualification granted to the project in the corresponding instances, continuing with the judicial actions already started or implementing new administrative or judicial actions that are necessary to this end, and it maintains the belief that hydric resources of the Aysén region are important for the energy development of the country. Nevertheless, given the current situation, there is uncertainty on the recoverability of the investment made so far at Centrales Hidroeléctricas de Aysén S.A., since it depends both on judicial decisions and on definitions in the energy agenda which cannot be foreseen at present, consequently the investment is not included in the portfolio of the Company’s immediate projects. Consequently, at closing date of fiscal year 2014, the Company recognized an impairment of its participation in Centrales Hidroeléctricas de Aysén S.A. amounting to ThCh$ 69,066,857, which remains in effect as of December 31, 2017. On December 7, 2017, an extraordinary shareholders’ meeting was held, in which the early dissolution of the Centrales Hidroeléctricas de Aysen S.A. aforementioned was agreed to, as well the company liquidation process of assets. The liquidation process contemplates a distribution of assets to shareholders and expected to be completed during the first half of 2018. In accordance with the above, the investment that Enel Generación Chile has in Centrales Hidroeléctricas de Aysén S.A. has been classified as non-current assets or disposal groups classified as held for sale (See Note 5.1). 12.2. Investments with significant influence The following tables show financial information as of December 31, 2017 and 2016, from the financial statements of the investments in associates where the Group has significant influence: As of December 31, 2017 % Ownership Interest Current Assets Non-current Assets Current Liabilities Non-current Liabilities Revenues Expenses Profit (Loss) Other Comprehensive Income Comprehensive Income Investments with Significant Influence Indirect ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GNL Chile S.A 33.33 % 71,254,956 148,950 60,052,823 — 687,399,254 (684,873,130 ) 2,526,124 (24,472 ) 2,501,652 As of December 31, 2016 % Ownership Interest Current Assets Non-current Assets Current Liabilities Non-current Liabilities Revenues Expenses Profit (Loss) Other Comprehensive Income Comprehensive Income Investments with Significant Influence Indirect ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GNL Chile S.A 33.33 % 90,283,944 117,703 78,452,153 — 615,229,994 (610,756,322 ) 4,473,672 (510,406 ) 3,963,266 GNL Quintero S.A. 20.00 % — — — — 86,471,706 (72,752,059 ) 13,719,647 (65,571,292 ) (51,851,645 ) Electrogas S.A. 42.50 % 9,318,456 40,746,438 5,683,680 13,809,430 24,126,070 (11,970,244 ) 12,155,826 (347,369 ) 11,808,457 Appendix 3 to these consolidated financial statements provides information on the main activities of our associates and the ownership interest that the Group holds in them. None of our associates have published price quotations 12.3. Joint ventures The following tables present information from the financial statements as of December 31, 2017 and 2016, on the main joint ventures: Centrales Hidroeléctricas Transmisora Eléctrica de Aysén S.A. de Quillota Ltda. 51.0% 51.0% 50.0% 50.0% 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Financial statement items ThCh$ ThCh$ ThCh$ ThCh$ Total current assets 355,835 863,962 7,793,702 6,366,378 Total non-current assets 8,030,172 15,159,321 12,036,201 12,034,576 Total current liabilities 139,182 3,324,706 440,426 245,025 Total non-current liabilities — 68,081 1,751,963 1,710,406 Cash and cash equivalents 355,446 860,719 7,310,296 5,716,196 Revenues — — 2,813,493 2,774,316 Other fixed operating expenses (8,144,855 ) (4,363,197 ) (525,471 ) — Depreciation and amortization expense — — (782,322 ) (773,093 ) Interest income 24,829 42,046 — 134,995 Income tax expense — (7,070 ) (313,709 ) (225,008 ) Profit (loss) (8,193,671 ) (4,284,131 ) 1,191,991 1,257,220 Other comprehensive income — — — — Comprehensive income (8,193,671 ) (4,284,131 ) 1,191,991 1,257,220 The profit and loss information corresponds to the 12-month year ended. d. There are no significant commitments and contingencies, or restrictions on funds transfers to its owners in associates and joint ventures.

Intangible Assets Other than Go

Intangible Assets Other than Goodwill	12 Months Ended
	Dec. 31, 2017
Disclosure Of Intangible Assets [Abstract]
Intangible Assets Other than Goodwill	13. INTANGIBLE ASSETS OTHER THAN GOODWILL. The following table presents intangible assets as of December 31, 2017 and 2016: As of December 31, 2017 2016 Intangible Assets, Net ThCh$ ThCh$ Intangible Assets, Net 55,170,904 44,470,750 Easements and water rights 12,608,950 12,564,076 Computer software 38,254,793 27,591,694 Other identifiable intangible assets 4,307,161 4,314,980 2017 2016 Intangible Assets, Gross ThCh$ ThCh$ Intangible Assets, Gross 118,593,240 101,092,918 Easements and water rights 14,598,701 14,553,826 Computer software 93,260,355 75,793,919 Other identifiable intangible assets 10,734,184 10,745,173 2017 2016 Intangible Assets, Amortization and Impairment ThCh$ ThCh$ Accumulated Amortization and Impairment, Total (63,422,336 ) (56,622,168 ) Easements and water rights (1,989,751 ) (1,989,750 ) Computer software (55,005,562 ) (48,202,225 ) Other identifiable intangible assets (6,427,023 ) (6,430,193 ) The reconciliations of the carrying amounts of intangible assets at December 31, 2017 and 2016 are as follows: Easements Computer Software Other Intangibles Assets, Net Changes in Intangible Assets ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2017 12,564,076 27,591,694 4,314,980 44,470,750 Changes in identifiable intangible assets Increases (decreases) other than from business combinations 295,588 17,466,436 — 17,762,024 Increase (decrease) from exchange differences, net — — (115 ) (115 ) Amortization (1) — (6,803,337 ) (7,704 ) (6,811,041 ) Increases (decreases) from transfers and other changes (250,714 ) — — (250,714 ) Increases (decreases) from transfers (250,714 ) — — (250,714 ) Total changes in identifiable intangible assets 44,874 10,663,099 (7,819 ) 10,700,154 Closing balance December 31, 2017 12,608,950 38,254,793 4,307,161 55,170,904 Easements Computer Software Other Intangibles Assets, Net Changes in Intangible Assets ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2016 14,575,473 27,824,092 479,761 42,879,326 Changes in identifiable intangible assets Increases (decreases) other than from business combinations 540,052 5,690,091 3,851,635 10,081,778 Increase (decrease) from exchange differences, net — — 2,897 2,897 Amortization (1) — (5,815,030 ) (18,961 ) (5,833,991 ) Increases (decreases) from transfers and other changes 352 — (352 ) — Increases (decreases) from transfers 352 — (352 ) — Increases (decreases) from other changes — — — — Disposals and removals from service (2,549,926 ) — — (2,549,926 ) Disposals (2,549,926 ) — — (2,549,926 ) Removals from service — — — — Other increases (decreases) (1,875 ) (107,459 ) — (109,334 ) Total changes in identifiable intangible assets (2,011,397 ) (232,398 ) 3,835,219 1,591,424 Closing balance December 31, 2016 12,564,076 27,591,694 4,314,980 44,470,750 (1) See Note 28. (2) See Note 15.e).ix) According to the Group management’s estimates and projections, the expected future cash flows attributable to intangible assets allow the recovery of the carrying amount of these assets recorded as of December 31, 2017 (See Note 3.e). As of December 31, 2017 and 2016, there are no significant intangible assets with an indefinite useful life.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Disclosure Of Goodwill [Abstract]
Goodwill	14. GOODWILL. The following table shows goodwill by the Cash-Generating Unit or group of Cash-Generating Units to which it belongs and changes as of December 31, 2017 and 2016: Opening Balance 01-01-2016 Increase/ (Decrease) Closing 12/31/2016 Increase/ (Decrease) Closing Balance 12/31/2017 Company Cash Generating Unit ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Empresa Eléctrica de Colina Ltda. Empresa 2,240,478 — 2,240,478 — 2,240,478 Compañía Eléctrica Tarapacá S.A. (1) Enel Generación Chile 4,656,105 (4,656,105 ) — — — Enel Distribución Chile S.A. Enel Distribución Chile 128,374,362 — 128,374,362 — 128,374,362 Enel Generación Chile S.A. Enel Generación Chile 731,782,459 — 731,782,459 — 731,782,459 GasAtacama Chile (1) Enel Generación Chile 20,204,251 4,656,105 24,860,356 — 24,860,356 Total 887,257,655 — 887,257,655 — 887,257,655 (1) On November 1, 2016, Compañía Eléctrica Tarapacá S.A. was merged with GasAtacama S.A., the latter being the surviving company. According to the Group management’s estimates and projections, the expected future cash flows projections attributable to the Cash-Generating Units or groups of Cash-Generating Units, to which the acquired goodwill has been allocated, allow recovery of its carrying amount as of December 31, 2017 and 2016 (See Note 3.e). The origin of the goodwill is detailed below: 1.- Empresa Eléctrica de Colina Ltda. On September 30, 1996, Enel Distribución Chile S.A. acquired 100% of Empresa Eléctrica de Colina Ltda. from the investment company Saint Thomas S.A., which is neither directly nor indirectly related to Enel Distribución Chile S.A. 2.- Enel Distribución Chile S.A. In November 2000, Enel Américas S.A. acquired an additional 25,4% ownership interest in Enel Distribución Chile S.A. in a public bidding process, reaching a 99,99% ownership interest in the company. 3.- Enel Generación Chile S.A. On May 11, 1999, Enel Américas S.A. acquired an additional 35% in Enel Generación Chile S.A. in a public bidding process on the Santiago Stock Exchange and by buying shares in the U.S. (30% and 5%, respectively), reaching a 60% ownership interest in the generation company. 4.- GasAtacama Chile S.A. (Formerly named Inversiones GasAtacama Holding Limitada) On April 22, 2014, Enel Generación Chile S.A. acquired the remaining 50% equity interest in GasAtacama Chile S.A that was owned at that time by Southern Cross Latin America Private Equity Fund III L.P. 5.- Empresa Eléctrica Pangue S.A. (Currently named GasAtacama Chile S.A.) On July 12, 2002, Enel Generación Chile S.A. acquired 2.51% of the shares of Empresa Eléctrica Pangue S.A. through a put option held by the minority shareholder International Finance Corporation (IFC). On May 2, 2012, Empresa Eléctrica Pangue S.A. merged with Compañía Eléctrica San Isidro S.A.; with the latter company being the surviving entity. 6.- Compañía Eléctrica San Isidro S.A. (Currently named GasAtacama Chile S.A.) On August 11, 2005, Enel Generación Chile S.A. acquired the shares of Inversiones Lo Venecia Ltda., whose only asset was a 25% interest in Compañía Eléctrica San Isidro S.A. (acquisition of non-controlling interests). On September 1, 2013, Compañía Eléctrica San Isidro S.A. was merged with Endesa Eco S.A., the latter being the surviving entity. On November 1, 2013, Endesa Eco S.A. was merged with Compañía Eléctrica Tarapacá, the latter being the surviving entity. Subsequently, on November 1, 2016, Compañía Eléctrica Tarapacá S.A. was merged with GasAtacama Chile S.A., the latter being the surviving company.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Disclosure Of Property Plant And Equipment [Abstract]
Property, Plant and Equipment	15. PROPERTY, PLANT AND EQUIPMENT. The following table shows property, plant and equipment as of December 31, 2017 and 2016: As of December 31, 2017 2016 Classes of Property, Plant and Equipment, Net ThCh$ ThCh$ Property, Plant and Equipment, Net 3,585,687,137 3,476,128,634 Construction in progress 666,590,543 688,387,124 Land 67,485,380 66,868,119 Buildings 12,793,641 13,020,474 Generation Plant and equipment 2,080,903,064 2,033,720,809 Network infrastructure 683,120,815 613,443,219 Fixtures and fittings 56,284,762 41,325,699 Other property, plant and equipment under financial lease 18,508,932 19,363,190 2017 2016 Classes of Property, Plant and Equipment, Gross ThCh$ ThCh$ Property, Plant and Equipment, Gross 6,726,796,186 6,471,364,618 Construction in progress 666,590,543 688,387,124 Land 67,485,380 66,868,119 Buildings 28,382,234 27,891,216 Generation Plant and equipment 4,636,175,749 4,481,701,141 Network infrastructure 1,151,951,280 1,050,212,442 Fixtures and fittings 147,450,968 127,544,544 Other property, plant and equipment under financial lease 28,760,032 28,760,032 Classes of Accumulated Depreciation and Impairment in Property, Plant 2017 2016 and Equipment ThCh$ ThCh$ Total Accumulated Depreciation and Impairment in Property, Plant and Equipment (3,141,109,049 ) (2,995,235,984 ) Buildings (15,588,593 ) (14,870,742 ) Generation Plant and equipment (2,555,272,685 ) (2,447,980,332 ) Network infrastructure (468,830,465 ) (436,769,223 ) Fixtures and fittings (91,166,206 ) (86,218,845 ) Other property, plant and equipment under financial lease (10,251,100 ) (9,396,842 ) The detail and changes in property, plant, and equipment at December 31, 2017 and 2016, are as follows: Construction in Land Buildings Generation Plant and Equipment Network infrastructure Fixtures and Fittings Other Property, Plant and Equipment under Financial Lease Property, Plant and Equipment, Net Changes in 2017 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2017 688,387,124 66,868,119 13,020,474 2,033,720,809 613,443,219 41,325,699 19,363,190 3,476,128,634 Changes: Increases other than from business combinations 281,007,995 — — — — 2,811,255 — 283,819,250 Increases (decreases) from exchange differences, net (101,444 ) (25,624 ) (44,699 ) (336,622 ) — (83,651 ) — (592,040 ) Depreciation (1) (3) — — (717,851 ) (107,292,353 ) (32,061,242 ) (4,947,361 ) (854,258 ) (145,873,065 ) Increases (decreases) from transfers and other changes (273,509,759 ) 776,933 439,284 155,711,630 99,419,024 17,162,888 — — Increases (decreases) for transfers (273,509,759 ) 776,933 439,284 155,711,630 99,419,024 17,162,888 — — Disposals and removals from service (30,255,180 ) (31,447 ) (154,623 ) (1,704,924 ) (1,023,777 ) 15,932 — (33,154,019 ) Disposals (5,099,800 ) (31,447 ) — (435,327 ) (18,555 ) 38,212 — (5,546,917 ) Removals from service (25,155,380 ) — (154,623 ) (1,269,597 ) (1,005,222 ) (22,280 ) — (27,607,102 ) Other increases (decreases) 1,061,807 (102,601 ) 251,056 804,524 3,343,591 — — 5,358,377 Total changes (21,796,581 ) 617,261 (226,833 ) 47,182,255 69,677,596 14,959,063 (854,258 ) 109,558,503 Closing balance December 31, 2017 666,590,543 67,485,380 12,793,641 2,080,903,064 683,120,815 56,284,762 18,508,932 3,585,687,137 Construction in progress Land Buildings Generation Plant and Equipment Network infrastructure Fixtures and Fittings Other Property, Plant and Equipment under Financial Lease Property, Plant and Equipment, Net Changes in 2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2016 636,148,748 66,900,933 13,481,093 2,072,402,503 589,334,703 20,716,643 20,075,072 3,419,059,695 Changes: Increases other than from business combinations 244,473,325 — 24,934 — 1,443,508 3,126,834 — 249,068,601 Increases (decreases) from exchange differences, net (37,543 ) (6,591 ) (11,711 ) (59,516 ) — (33,227 ) — (148,588 ) Depreciation (1) — — (620,865 ) (99,397,373 ) (25,187,344 ) (4,497,175 ) (711,882 ) (130,414,639 ) Impairment losses recognized in profit or loss (2) (30,785,531 ) — — — — — — (30,785,531 ) Increases (decreases) from transfers and other changes (128,045,183 ) 104,268 147,023 60,822,509 48,308,750 22,123,585 — 3,460,952 Increases (decreases) for transfers (127,694,878 ) 104,268 147,023 55,464,141 48,308,750 23,670,696 — — Increases (decreases) from transfers from constructions in progress (127,694,878 ) 104,268 147,023 55,464,141 48,308,750 23,670,696 — — Increases (decreases) from other changes (350,305 ) — — 5,358,368 — (1,547,111 ) — 3,460,952 Disposals and removals from service (33,366,692 ) (130,491 ) — (47,314 ) (456,398 ) (110,961 ) — (34,111,856 ) Disposals — — — — — — — — Removals from service (33,366,692 ) (130,491 ) — (47,314 ) (456,398 ) (110,961 ) — (34,111,856 ) Other increases (decreases) — — — 1,753,884 — — 3,416,059,695 Total changes 52,238,376 (32,814 ) (460,619 ) (38,681,694 ) 24,108,516 20,609,056 (711,882 ) 57,068,939 Closing balance December 31, 2016 688,387,124 66,868,119 13,020,474 2,033,720,809 613,443,219 41,325,699 19,363,190 3,476,128,634 (1) See Note 28. (2) See Note 15.e).vii) and x). (3) See Note 2.3.1. Additional information on property, plant and equipment, net a) Main investments Major additions to property, plant and equipment are investments in operating plants and new projects amounting to ThCh$283,819,250 and ThCh$267,113,692 as of December 31, 2017 and 2016, respectively. In the generation business the main investments include maintenance to plants of ThCh$203,460,335 and ThCh$189,259,095 as of December 31, 2017 and 2016, respectively. In the distribution business, major investments are network extensions and investments to optimize their operation, in order to improve the efficiency and quality of service, amounting to ThCh$79,028,802 and ThCh$76,355,399 as of December 31, 2017 and 2016, respectively. b) Capitalized expenses b.1) Borrowing costs Capitalized borrowing costs were ThCh$4,078,463, ThCh$3,001,211 and ThCh$2,221,329 for the years ended December 31, 2017, 2016 and 2015 respectively (See Note 31). The weighted average borrowing rate was in a range of 7.12% and 7.95% as of December 31, 2017 (7.95% and 9% as of December 31, 2016 and 9% as of December 31, 2015). b.2) Employee expenses capitalized Employee expenses capitalized that are directly attributable to constructions in progress were ThCh$14,388,987, ThCh$16,096,852 and ThCh$21,004,053 during the years ended December 31, 2017, 2016 and 2015, respectively. c) Finance leases As of December 31, 2017 and 2016, property, plant and equipment includes ThCh$18,508,931 and ThCh$19,363,190, respectively, in leased assets classified as finance leases. The present value of future lease payments derived from these finance leases is as follows: As of December 31, 2017 2016 Gross Interest Present Value Gross Interest Present Value ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Less than one year 2,459,000 659,212 1,799,788 2,677,881 837,514 1,840,367 From one to five years 9,836,000 1,244,808 8,591,192 10,711,519 1,763,190 8,948,329 More than five years 4,377,544 159,610 4,217,934 7,445,079 484,128 6,960,951 Total 16,672,544 2,063,630 14,608,914 20,834,479 3,084,832 17,749,647 Leased assets primarily relate to a lease agreement for Electric Transmission Lines and Installations (Ralco-Charrúa 2X220 KV) entered into between Enel Generación Chile S.A. and Transelec S.A. The lease agreement has a 20-year maturity and bears interest at an annual rate of 6.5%. d) Operating leases The consolidated statements of income for the years ended December 31, 2017, 2016 and 2015 include ThCh$2,969,436, ThCh$3,250,503 and ThCh$10,098,166 respectively, corresponding to operating lease contracts for material assets in operation. As of December 31, 2017 and 2016, the total future lease payments under those contracts are as follows: As of December 31, 2017 2016 ThCh$ ThCh$ Less than one year 4,622,605 7,133,186 From one to five years 9,006,627 11,998,147 More than five years 1,345,183 9,015,356 Total 14,974,415 28,146,689 e) Other information (i) As of December 31, 2017 and 2016, the Group had contractual commitments for the acquisition of property, plant and equipment amounting to ThCh$376,627,392 and ThCh$416,684,117, respectively. (ii) As of December 31, 2017 and 2016, the Group does not have property, plant and equipment pledged as security for liabilities. (iii) The Group and its consolidated entities have insurance policies for all risks, earthquake and machinery breakdown and damages for business interruption with a €1,000 million (ThCh$737,290,000) limit in the case of generating companies and a €50 million (ThCh$36,864,500) limit for distribution companies, including business interruption coverage. Additionally, the Group has Civil Liability insurance to meet claims from third parties with a €500 million (ThCh$368,645,000) limit. The insurance premiums associated with these policies are presented proportionally for each company in the caption “Prepaid expenses”. (iv) The condition of certain assets of our subsidiary Enel Generación Chile S.A. changed, primarily works and infrastructure for facilities built to support power generation in the SIC grid in 1998, due primarily to the installation in the SIC of new thermoelectric plants, the arrival of LNG, and new other projects. As such, a new supply configuration for the upcoming years, in which it is expected that these facilities will not be used. Therefore, in 2009, Enel Generación Chile S.A. recognized an impairment loss of ThCh$43,999,600 for these assets, which is still has not reversed. (v) At the end of 2014, the Group recognized an impairment loss of ThCh$12,581,947 related to the Punta Alcalde project. This impairment loss was triggered because the current definition of the project is not fully aligned with the strategy that the Company is reformulating; particularly, with regard to technological leadership, and to community and environmental sustainability. The Company has decided to suspend the project as its profitability is still unclear (see note 3.e). (vi) At the end of 2012, our subsidiary Compañía Eléctrica Tarapacá S.A. (“Celta”, a company merged with GasAtacama Chile on November 1, 2016), recognized an impairment loss of ThCh$12,578,098, to adjust the carrying amount of certain specific assets operating in the SING grid to its recoverable amount. At the closing of 2015, were approved certain regulatory developments to the Chilean energy industry, which after being evaluated by the Company, resulted in the identification of a new single CGU for all generation assets in Chile. The analysis took into account the fact that Enel Generación Chile S.A. performed an optimization and management of all its assets related to its generation business, it had a centralized trade policy, with sales contracts agreed at company level and not assigned to power plants. Therefore, generation of cash flows depends on all the assets as a whole. Previously, the company identified a CGU for the assets operating in the SIC grid and another one for the assets operating in the SING, under the consideration that there were two separate markets. The new scheme, approved in 2015, posed by the interconnection of SIC and SING, unifies markets and considers a single determination of prices, which was illustrated by latest bids for energy supply to regulated customers. Therefore, these new conditions indicated that the recognized impairment loss mentioned above has been reversed. This was based, inter alia, on the generation of additional value by the interconnection project between the SIC and SING which is expected to be operational in 2019, by improved utilization of reserves, by expanding the potential market for specific impaired assets and decreasing overall risk of the portfolio. The effects of the interconnection are considered in the five-year projections used by the company to perform impairment tests (see Note 3.e). (vii) As of December 31, 2015, Enel Generación Chile recognized an impairment loss of ThCh$2,522,445 related to the wind project Waiwen. This loss was a result of new assessment of the feasibility of the project performed by the Company and a conclusion that, under existing conditions to date, its profitability is uncertain. (viii) In line with its sustainability strategy and in order to develop community relationships, Enel Generación Chile S.A. has decided to research new design alternatives for the Neltume project, in particular regarding the issue of the discharge of Lake Neltume, which has been raised by the communities in the various instances of dialogue. To start a new phase of research of an alternative project, which includes the discharge of water on the Fuy River in late December 2015, the Company withdrew the Environmental Impact Study. This decision applies only to the portion of the Neltume project related to the power plant and not to portion related to the transmission project, which continues its course on handling in the Environmental Assessment Service. As a result of the above, as of December 31, 2015, Enel Generación Chile S.A. recognized a loss of ThCh$2,706,830, associated with the write down of certain assets related to Environmental Impact Study, which has been withdrawn and to other studies directly linked to the old design of assets. Consequently, in line with the new sustainability strategy and as a result of sustained dialog with the communities, Enel Generación Chile’s projects in the territory, namely Neltume and Choshuenco, have good prospects from a social community point of view. Nonetheless, given the current condition of the Chilean electricity market, expected profitability of the Neltume and Choshuenco projects is lower than the total capitalized investment in them. As a result, at the end of 2016, Enel Generación Chile recognized an impairment loss of ThCh$20,459,461 associated with the Neltume project and ThCh$3,748,124 associated with the Choshuenco project. At the end of the fiscal year 2017, following an analysis during the last months, Enel Generación Chile determined to abandon the Neltume project; a decision justified mainly by the high-sustained competitiveness in the Chilean electricity market, which was ratified in November 2017 with the result of the last tender of Electric Distributors. Added to the above, there is the time associated with developing the alternative water discharge, considering a period of no less than 5 years, given the necessity to request and obtain a transfer of the current Water Right and commission a new study for environmental impact. The abandonment implied the recognition of a ThCh$21,975,641 loss, with the purpose of reducing to zero the net book value of the assets associated with the project. Additionally, the Company also decided to abandon the Choshuenco project, mainly because the strong synergies considered with the Neltume hydroelectric project would not exist anymore and make it not viable. This decision involved recognizing a loss of ThCh$3,130,270, with the purpose of reducing the net book value of the assets associated with the project to zero. (ix) On August 31, 2016, Enel Generación Chile decided to withdraw from the water rights associated with the hydroelectric projects Bardón, Chillan 1, Chillan 2, Futaleufú, Hechún and Puelo. This decision was made because of, among other evaluation aspects, the high annual maintenance cost of these unused water rights, lack of technical and economic feasibility and insufficient local communities support. As a result, the Group wrote off a total amount of ThCh$ 32,834,160 of property, plant and equipment and ThCh$ 2,549,926 of intangible assets, which represent 100% of the related costs previously capitalized (see Note 29). (x) As of December 31, 2016, Enel Generación Chile recognized an impairment loss of ThCh$ 6,577,946 associated with certain Non-Conventional Renewable Energy (“NCRE”) initiatives, such as wind, mini-hydro, biomass and solar projects. These initiatives deal with collection of natural resources data (wind speed, solar radiation, etc.) as well as engineering studies enabling the Company to perform and support technical and economical assessments in order to visualize their perspectives and decide on future steps. The results of the studies have not been entirely satisfactory, mainly due to the current conditions in the Chilean electricity market, as future viability of the NCRE projects is uncertain. As a result, Enel Generación Chile recognized an impairment loss for 100% of the capitalized investments to date in NCRE projects. On the other hand, Enel Generación Chile decided to write off 100% of capitalized investment in two thermal projects that until now were held in its portfolio. These are the Tames 2 and Totoralillo projects, which were being developed within the framework of the public land concessions bidden by the National Heritage Ministry in 2013. The amount of the write-off was ThCh$ 1,096,137 and arose as a result of the current conditions in the Chilean electricity market, lack of future viability of this type of technology (steam-coal) and high development costs, which make these projects unfeasible. In addition, Enel Generación Chile recognized a provision of ThCh$2,244,900 for the fines to be paid upon withdrawing from the concessions related to these projects. During fiscal year 2017, the Ministry of National Assets and Enel Generación Chile resolved to extinguish the onerous concessions by mutual agreement, and fines were not applied.

Investment Property

Investment Property	12 Months Ended
	Dec. 31, 2017
Disclosure Of Investment Property [Abstract]
Investment Property	16. INVESTMENT PROPERTY. The detail and changes in investment property during the years ended December 31, 2017 and 2016, are as follows: Investment Properties, Accumulated Depreciation, Amortization and Impairment Investment Properties, Net Investment Properties ThCh$ ThCh$ ThCh$ Balance at January 1, 2016 8,938,662 (787,675 ) 8,150,987 Depreciation expense — (22,465 ) (22,465 ) Balance at December 31, 2016 8,938,662 (810,140 ) 8,128,522 Depreciation expense — (22,465 ) (22,465 ) Other increases (decreases) 250,715 — 250,715 Balance at December 31, 2017 9,189,377 (832,605 ) 8,356,772 There were no investment properties disposed of during the periods ended December 31, 2017 and 2016. Fair value measurement and hierarchy As of December 31, 2017, the fair value of the Group’s investment properties was ThCh$9,758,782 (ThCh$11,567,758 as of December 31, 2016) which was determined using independent appraisals. The fair value measurement for these investment properties was categorized as Level 3 within the fair value hierarchy. For the years ended December 31, 2017, 2016 and 2015, the detail of income and expenses from investment properties is as follows: For the years ended December 31, 2017 2016 2015 Income and expense from investment properties ThCh$ ThCh$ ThCh$ Rental income from investment properties 192,719 167,429 163,660 Income from the sale of investment properties (*) — — 1,800,933 Direct operating expense from investment properties generating rental income (78,367 ) (71,339 ) (163,767 ) Direct operating expense from investment properties not generating rental income (*) — — (337,770 ) Total 114,352 96,090 1,463,056 (*) See Note 3.h. The Group has no repair, maintenance, acquisition, construction or development agreements that represent future obligations for the Group as of December 31, 2017 and 2016. The Group has insurance policies to cover operational risks of its investment properties, as well as to cover legal claims against the Group that could potentially arise from exercising its business activity. Management considers that the insurance policy coverage is sufficient against the risks involved.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Disclosure Of Income Taxes [Abstract]
Income Taxes	17. INCOME TAXES. a) Income taxes The following table presents the components of the income tax expense / (benefit) for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Current Income Tax and Adjustments to Current Income Tax for Previous Periods ThCh$ ThCh$ ThCh$ Current income tax (162,820,181 ) (162,033,295 ) (84,003,064 ) Adjustments to current tax from the previous period (1,127,646 ) (710,740 ) (7,307,511 ) Other current tax benefit / (expense) 15,934,106 21,380,071 (34,995,137 ) Current tax expense, net (148,013,721 ) (141,363,964 ) (126,305,712 ) Benefit / (expense) from deferred taxes for origination and reversal of temporary differences 4,671,420 29,960,782 16,693,113 Total deferred tax benefit / (expense) 4,671,420 29,960,782 16,693,113 Income tax expense (143,342,301 ) (111,403,182 ) (109,612,599 ) The following table reconciles income taxes resulting from applying the local current tax rate to “Net income before taxes” and the actual income tax expense recorded in the accompanying Consolidated Statement of Comprehensive Income for the years ended December 31, 2017, 2016 and 2015: 12-31-2017 12-31-2016 12-31-2015 Reconciliation of Tax Expense Rate ThCh$ Rate ThCh$ Rate ThCh$ ACCOUNTING INCOME BEFORE TAX 666,760,212 676,674,298 456,580,763 Total tax income (expense) using statutory rate (25.50 %) (170,023,854 ) (24.00 %) (162,401,830 ) (22.50 %) (102,730,671 ) Tax effect of rates applied in other countries 0.05 % 328,968 Tax effect of non-taxable revenues 5.67 % 37,774,743 6.53 % 44,163,296 2.12 % 9,674,087 Tax effect of non-tax-deductible expenses (3.11 %) (20,737,858 ) (2.13 %) (14,392,926 ) (4.61 %) (21,060,811 ) Tax effect of adjustments to taxes in previous periods (0.17 %) (1,127,646 ) (0.11 %) (710,740 ) (1.60 %) (7,307,511 ) Price level restatement for tax purposes (investments and equity) 1.57 % 10,443,346 3.24 % 21,939,018 2.58 % 11,812,307 Total adjustments to tax expense using statutory rate 4.00 % 26,681,553 7.53 % 50,998,648 (1.51 %) (6,881,928 ) Income tax benefit (expense) (21.50 %) (143,342,301 ) (16.47 %) (111,403,182 ) (24.01 %) (109,612,599 ) b) Deferred taxes The origination and changes in deferred tax assets and liabilities as of December 31, 2017 and 2016, are as follows: December 31, 2017 December 31, 2016 Assets Liabilities Assets Liabilities Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation 162,315 (263,847,598 ) 5,465,105 (246,373,416 ) Provisions 39,890,472 — 36,785,893 (342,283 ) Post-employment benefit obligations 6,336,920 (364,925 ) 6,795,806 (579,978 ) Tax loss carryforwards 9,536,102 — 11,911,396 — Other 49,635,500 (10,734,675 ) 21,979,742 (13,210,542 ) Deferred Tax Assets/Liabilities before compensation 105,561,309 (274,947,198 ) 82,937,942 (260,506,219 ) Compensation of Assets (Liabilities) for deferred taxes (102,723,517 ) 102,723,517 (61,141,425 ) 61,141,425 Deferred Tax Assets (Liabilities) after compensation 2,837,792 (172,223,681 ) 21,796,517 (199,364,794 ) Opening balance January 1, 2017 Changes 2017 Closing balance December 31, 2017 Increase (decrease) in profit or loss Increase (decrease) in other comprehensive income Recognized directly in equity Foreign currency translation Transfers to (from) Noncurrent Assets and Groups in Dispossession held for sale Other increases (decreases) Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation (240,908,311 ) (22,836,691 ) — — 61,222 — (1,503 ) (263,685,283 ) Provisions 36,443,610 2,940,867 — — — — 505,995 39,890,472 Post-employment benefit obligations 6,215,828 976,808 (463,556 ) — — — (757,085 ) 5,971,995 Tax loss carryforwards 11,911,396 (2,375,294 ) — — — — — 9,536,102 Other (1) 8,769,200 25,965,730 (497 ) — (28,356 ) — 4,194,748 38,900,825 Deferred Tax Assets (Liabilities) (177,568,277 ) 4,671,420 (464,053 ) — 32,866 — 3,942,155 (169,385,889 ) Opening balance January 1, 2016 Changes 2016 Closing balance December 31, 2016 Increase (decrease) in profit or loss Increase (decrease) in other comprehensive income Recognized directly in equity Foreign currency translation Transfers to (from) Noncurrent Assets and Groups in Dispossession held for sale Other increases (decreases) Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation (265,258,085 ) 24,331,401 — — 15,488 — 2,885 (240,908,311 ) Provisions 33,240,241 3,203,369 — — — (62,749 ) 62,749 36,443,610 Post-employment benefit obligations 5,236,522 (807,693 ) 1,786,999 — — 21,853 (21,853 ) 6,215,828 Tax loss carryforwards 12,084,821 (173,368 ) — — — — (57 ) 11,911,396 Other 43,365,996 756,651 1,822 (30,829,099 ) 12,645 — (4,538,815 ) 8,769,200 Deferred Tax Assets (Liabilities) (171,330,505 ) 27,310,360 1,788,821 (30,829,099 ) 28,133 (40,896 ) (4,495,091 ) (177,568,277 ) (1) Deferred taxes recognized in increase (decrease) in profit and loss are mainly the related to recognition of tax on the investment in Hidroaysen, which has been classified as non-current assets held for distribution to the owners. Recovery of deferred tax assets will depend on whether sufficient tax profits will be obtained in the future. The Group believes that the future profit projections for its subsidiaries will allow these assets to be recovered. a. As of December 31, 2017 and 2016, the Group does not have unrecognized deferred tax assets related to tax loss carryforwards. The Group has not recognized deferred tax liabilities for taxable temporary differences associated with investments in subsidiaries and joint ventures, as it is able to control the timing of the reversal of the temporary differences and considers that it is probable that such temporary differences will not reverse in the foreseeable future. As of December 31, 2017 and 2016, the aggregate of taxable temporary differences associated with investments in subsidiaries and joint ventures for which deferred tax liabilities have not been recognized totaled ThCh$1,143,608,396 and ThCh$1,145,437,791, respectively. Additionally, the Group has not recognized deferred tax asset for deductible temporary differences which as of December 31, 2017 and 2016, totaled ThCh$257,883,751 and ThCh$399,626,044, respectively, as it is not probable that sufficient future taxable profits exist to recover such temporary differences. The Group entities are potentially subject to income tax audits by the Chilean tax regulator and are limited to three tax years after which tax audits over those years can no longer be performed. Tax audits by nature are often complex and can require several years to complete. The tax years potentially subject to examination are 2014 through 2016. The Company came into legal existence on March 1, 2016, therefore, it does not have prior periods subject to income tax audits. Given the range of possible interpretations of tax standards, the results of any future inspections carried out by Chilean tax authority for the years subject to audit can give rise to tax liabilities that cannot currently be quantified objectively. Nevertheless, management estimates that the liabilities, if any, that may arise from such tax audits, would not significantly impact the Group’s future results. The effects of deferred tax on the components of other comprehensive income for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Effects of Deferred Tax on the Components of Amount Tax Income Tax Expense (Benefit) Amount After Tax Amount Before Tax Income Tax Expense (Benefit) Amount After Tax Amount Before Tax Income Tax Expense (Benefit) Amount After Tax Other Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Available-for-sale financial assets 1,840 (497 ) 1,343 (6,740 ) 1,820 (4,920 ) 1,077 (290 ) 787 Cash flow hedge 97,558,961 (25,701,599 ) 71,857,362 89,068,357 (21,116,232 ) 67,952,125 (122,593,576 ) 31,868,299 (90,725,277 ) Share of other comprehensive income from associates and joint ventures accounted for using the equity method (1,490 ) — (1,490 ) (11,691,075 ) — (11,691,075 ) (577,862 ) — (577,862 ) Foreign currency translation (3,686,549 ) — (3,686,549 ) (3,532,844 ) — (3,532,844 ) 162,373 — 162,373 Actuarial gains(losses) on defined-benefit pension plans 1,716,875 (463,556 ) 1,253,319 (6,618,514 ) 1,786,999 (4,831,515 ) (5,645,532 ) 1,325,242 (4,320,290 ) Income tax related to components of other comprehensive income 95,589,637 (26,165,652 ) 69,423,985 67,219,184 (19,327,413 ) 47,891,771 (128,653,520 ) 33,193,251 (95,460,269 ) b. In Chile, Law No. 20,780 was published in the Official Gazette on September 29, 2014. It changes the income tax system and other taxes, by replacing the current tax system in 2017 with two alternative tax systems: the attributed income system and partially integrated system. This law gradually increases the rate of income tax on corporate income. Thus, it increased to 21% in 2014, to 22.5% in 2015 and to 24% in 2016. From 2017 taxpayers choosing the attributed income system are subject to a rate of 25%, while companies choosing the partially integrated system are subject to a rate of 25.5% in 2017 and 27% in 2018. The law also states that corporations will automatically be subject to the partially integrated system unless a future Extraordinary Shareholders’ Meeting agrees to select the attributed income system. Law No. 20,899 was published on February 8, 2016, simplifying the income tax system. This law among its main modifications imposed a partially integrated system as mandatory for corporations, cancelling the previously available attributed income system option. The movements in deferred taxes for the components of other comprehensive income as of December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Reconciliation of changes in deferred taxes of components of other comprehensive income ThCh$ ThCh$ ThCh$ Total increases (decreases) for deferred taxes of other comprehensive income from continuing operations (497 ) 1,788,821 1,724,427 Income tax of changes in cash flow hedge transactions (25,701,599 ) (21,116,234 ) 31,468,824 Total income tax relating to components of other comprehensive income (25,702,096 ) (19,327,413 ) 33,193,251

Other Financial Liabilities

Other Financial Liabilities	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Liabilities [Abstract]
Other Financial Liabilities	18. OTHER FINANCIAL LIABILITIES. The balances of other financial liabilities as of December 31, 2017 and 2016, are as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Other financial liabilities ThCh$ ThCh$ ThCh$ ThCh$ Interest –bearing borrowings 17,255,692 760,932,929 18,013,114 802,046,968 Hedging derivatives (*) 304,278 21,045,216 313,571 48,981,953 Non-hedging derivatives (**) 1,255,478 — 7,369,481 2,987,830 Total 18,815,448 781,978,145 25,696,166 854,016,751 (*) See Note 20.2.a (**) See Note 20.2.b 18.1 Interest-bearing borrowings The detail of current and non-current interest-bearing borrowings as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Classes of Interest-bearing borrowings ThCh$ ThCh$ ThCh$ ThCh$ Bank loans 122 — 4,274 — Unsecured obligations 15,455,782 748,123,803 16,168,473 786,137,688 Financial leases 1,799,788 12,809,126 1,840,367 15,909,280 Total 17,255,692 760,932,929 18,013,114 802,046,968 Bank loans by currency and contractual maturity as of December 31, 2017 and 2016, are as follows: Summary of bank loans by currency and maturity Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 122 — 122 — — — — — — Total 122 — 122 — — — — — — Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 4,274 — 4,274 — — — — — — Total 4,274 — 4,274 — — — — — — Fair value measurement and hierarchy The fair value of current and non-current bank borrowings as of December 31, 2017 and 2016 totaled ThCh$122 and ThCh$4.274, respectively . The fair value measurement of borrowings has been categorized as Level 2 (see Note 3.h). Identification of bank borrowings by company Appendix No.4, letter a), presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the bank loans detailed above. December 31, 2017 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 2,037 — 2,037 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 2,135 — 2,135 — — — — — — Total 4,274 — 4,274 — — — — — — 18.2 Unsecured liabilities The detail of Unsecured Liabilities by currency and maturity as of December 31, 2017 and 2016, is as follows: Summary of unsecured liabilities by currency and maturity Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,322,081 2,206,269 8,528,350 — — — — 430,228,859 430,228,859 Chile U.F. 6.00% 5.48% Unsecured — 6,927,432 6,927,432 5,574,013 5,574,013 5,574,013 5,574,013 295,598,892 317,894,944 Total 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2015 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,884,819 2,402,653 9,287,472 — — — — 468,578,474 468,578,474 Chile U.F. 6.00% 5.48% Unsecured — 6,881,001 6,881,001 5,480,380 5,480,380 5,480,380 5,480,380 295,637,694 317,559,214 Total 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688 Identification of unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,152,926 — 4,152,926 — — — — 125,566,611 125,566,611 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,328,023 — 1,328,023 — — — — 42,902,198 42,902,198 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 841,132 — 841,132 — — — — 19,398,499 19,398,499 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,206,269 2,206,269 — — — — 242,361,551 242,361,551 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,374,051 6,374,051 5,574,013 5,574,013 5,574,013 5,574,013 30,872,536 53,168,588 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% No — 553,381 553,381 — — — — 264,726,356 264,726,356 Total Unsecured Bonds 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 December 31, 2016 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,522,585 — 4,522,585 — — — — 136,759,395 136,759,395 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,446,232 — 1,446,232 — — — — 46,792,429 46,792,429 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 916,002 — 916,002 — — — — 21,608,757 21,608,757 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,402,653 2,402,653 — — — — 263,417,893 263,417,893 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,337,021 6,337,021 5,480,380 5,480,380 5,480,380 5,480,380 35,587,764 57,509,284 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M (*) Chile U.F. 4.82% 4.75% No — 543,980 543,980 — — — — 260,049,930 260,049,930 Total Unsecured Bonds 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688 18.3 Secured liabilities As of December 31, 2017 and 2016, there were no secured liabilities. Fair value measurement and hierarchy The fair value of current and non-current unsecured liabilities as of December 31, 2017 and 2016 totaled ThCh$947,565,989 and ThCh$998,383,047, respectively. The fair value measurement of these liabilities has been categorized as Level 2 (See Note 3.h). It is important to note that these financial assets are measured at amortized cost (See Note 3.g.4). 18.4 Appendix No. 4 letter c) presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the finance lease obligations detailed above. December 31, 2017 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 Total Leasing 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 December 31, 2016 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 Total Leasing 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 18.5 Hedged debt The U.S. dollar denominated debt of the Group as of December 31, 2017 and 2016, that is designated as cash flow hedge to hedge the portion of revenue from its consolidated entities that is directly linked to variations in the U.S. dollar, as referenced in Note 3.m, was ThCh$440,823,086 and ThCh$480,061,539, respectively. The following table details changes in “Reserve for cash flow hedges” as of December 31, 2017, 2016 and 2015, due to exchange differences of this debt: For the years ended December 31, 2017 2016 2015 ThCh$ ThCh$ ThCh$ Balance in hedging reserves (hedging income) at the beginning of the period, net (52,747,646 ) (74,953,393 ) (39,805,098 ) Foreign currency exchange differences recognized in equity, net 17,321,594 14,317,257 (38,579,730 ) Foreign currency exchange differences recognized in profit and loss, net 8,258,044 7,888,490 3,431,435 Balance in hedging reserves (hedging income) at the end of the period, net (27,168,008 ) (52,747,646 ) (74,953,393 ) 18.6 Other information As of December 31, 2017 and 2016, the Group has undrawn line of credits available for use amounting to ThCh$199,271,103 and ThCh$342,827,047, respectively.

Risk Management Policy

Risk Management Policy	12 Months Ended
	Dec. 31, 2017
Disclosure Of Risk Management [Abstract]
Risk Management Policy	19. RISK MANAGEMENT POLICY. The Group’s companies are exposed to certain risks that are managed by systems that identify, measure, limit concentration of, and monitor these risks. The main principles in the Group’s risk management policy include the following: • Compliance with good corporate governance standards. • Strict compliance with all the Group’s internal policies. • Each business and corporate area determines: I. The markets in which it can operate based on its knowledge and ability to ensure effective risk management; II. Criteria regarding counterparts; III. Authorized operators. • Business and corporate areas establish their risk tolerance in a manner consistent with the defined strategy for each market in which they operate. • All of the operations of the businesses and corporate areas are conducted within the limits approved for each case. • Businesses, corporate areas, lines of business and companies design the risk management controls necessary to ensure that transactions in the markets are conducted in accordance with the Enel Chile’s policies, standards, and procedures. 19.1 Interest rate risk Changes in interest rates affect the fair value of assets and liabilities bearing fixed interest rates, as well as the expected future cash flows of assets and liabilities subject to floating interest rates. The objective of managing interest rate risk exposure is to achieve a balance in the debt structure to minimize the cost of debt with reduced volatility in profit or loss. The comparative structure of the financial debt of the Enel Chile Group according to the fixed and / or protected interest rate on the gross debt, after derivatives contracted, is as follows: Gross position: For the years ended December 31, 2017 2016 % % Fixed interest rate 92% 92% Total 92% 92% Depending on the Group’s estimates and on the objectives of the debt structure, hedging transactions are performed by entering into derivatives contracts that mitigate interest rate risk. 19.2 Exchange rate risk Exchange rate risks involve basically the following transactions: • Debt taken on by the Group’s companies that is denominated in a currency other than that in which its cash flows are indexed. • Payments to be made for the acquisition of project-related materials and for corporate insurance policies in a currency other than that in which its cash flows are indexed. • Revenues in the Group companies directly linked to changes in currencies other than that of its cash flows. In order to mitigate foreign currency risk, the Group’s foreign currency risk management policy is based on cash flows and includes maintaining a balance between U.S. dollar flows and the levels of assets and liabilities denominated in this currency. The objective is to minimize the exposure to variability in cash flows that are attributable to foreign exchange risk. The hedging instruments currently being used to comply with the policy are currency swaps and forward exchange contracts. In addition, the policy seeks to refinance debt in the functional currency of each of the Group’s companies. 19.3 Commodities risk The Group has a risk exposure to price fluctuations in certain commodities, basically due to: • Purchases of fuel used to generate electricity. • Energy purchase/sale transactions that take place in local markets. In order to reduce the risk in situations of extreme drought, the Group has designed a commercial policy that defines the levels of sales commitments in line with the capacity of its generating power plants in a dry year. It also includes risk mitigation terms in certain contracts with unregulated customers and with regulated customers subject to long-term tender processes, establishing indexation polynomials that allow for reducing commodities exposure risk. Considering the operating conditions faced by the power generation market in Chile, with drought and highly volatile commodity prices on international markets, the Group is constantly verifying the advisability of using hedging to lessen the impacts that these price swings have on its results. As of December 31, 2017, the Group had swap hedges for 2.3 million MMBTU to be settled at January 2018. As of December 31, 2016, the Group had swap hedges for 3 million barrels of Brent oil to be settle from January to November 2017 and 3.3 million MMTBU of Henry Hub gas swap to be settle from January to September 2017. Depending on operating conditions, which are constantly being updated, these hedges may be modified or may cover other commodities.. 19.4 Liquidity risk The Group maintains a liquidity risk management policy that consists of entering into long-term committed banking facilities and temporary financial investments for amounts that cover the projected needs over a period of time that is determined based on the situation and expectations for debt and capital markets. The projected needs mentioned above include maturities of financial debt, net of financial derivatives. For further details regarding the features and conditions of financial obligations and financial derivatives. See Notes 18 and 20, and Appendix No. 4. As of December 31, 2017 and 2016, the Group has cash and cash equivalent totaling ThCh$419,456,026 and ThCh$245,999,192, respectively, and unconditionally available lines of long-term credit totaling ThCh$199,271,103 and ThCh$342,827,047, respectively. 19.5 Credit risk The Group closely monitors its credit risk. Trade receivables: The credit risk for receivables from the Group’s commercial activity has historically been very low, due to the short term period of collections from customers, resulting in non-significant cumulative receivables amounts. This situation applies to both the electricity generation and distribution lines of business. In the electricity generation and distribution lines of business, regulations allow the suspension of energy service to customers with outstanding payments, and the contracts have termination clauses for payment default. The Group monitors its credit risk on an ongoing basis and measures its maximum exposure to payment default risk, which, as stated above, is very limited. In the case of our electricity distribution company, the suspension of energy service to customers, it is a power of the company in case of breaches by our clients, which is applied according to the current regulation, which facilitates the process of evaluation and control of credit risk, which by the way is limited. Financial assets: Cash surpluses are invested in the highest-rated local and foreign financial entities (with risk rating equivalent to investment grade where possible) with thresholds established for each entity. In selecting banks to make investments, the Group considers those banks with investment grade ratings granted by main international rating agencies (Moody’s, S&P and Fitch). Investments may be backed with treasury bonds from the countries in which the Group operates and/or with commercial papers issued by the highest rated banks; the latter are preferred, as they offer higher returns (always in line with current investment policies). 19.6 Risk measurement The Group measures the Value at Risk (VaR) of its debt positions and financial derivatives in order to monitor the risk assumed by the Group, thereby reducing volatility in the income statement. The portfolio of positions included for the purposes of the calculations of this value at risk include: • Financial debt. • Hedging derivatives for debt. The VaR determined represents the potential variation in value of the portfolio of positions described above in one quarter with a 95% confidence level. To determine the VaR, we take into account the volatility of the risk variables affecting the value of the portfolio of positions including: • U.S. dollar Libor interest rate. • The exchange rates of the various currencies used in the calculation. The calculation of VaR is based on generating possible future scenarios (at one quarter) of market values (both spot and term) for the risk variables based on the scenarios with observable inputs for a same period (quarter) during five years. The one-quarter 95%-confidence VaR number is calculated as the 5% percentile of the potential variations in the fair value of the portfolio in one quarter. Taking into account the assumptions described above, the one-quarter VaR was ThCh$66,890,686. This amount represents the potential increase of the Debt and Derivatives’ Portfolio, thus these Values at Risk are inherently related, among other factors, to the Portfolio’s value at each quarter’ end.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Instruments [Abstract]
Financial Instruments	20. FINANCIAL INSTRUMENTS. 20.1 Financial instruments, classified by type and category a) The detail of financial assets, classified by type and category, as of December 31, 2017 and 2016, is as follows: December 31, 2017 Financial assets held for trading (*) Held-to-maturity investments (*) Loans and receivables Available-for-sale financial assets Financial derivatives for hedging ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Derivative instruments 402,716 — — — 20,038,433 Other financial assets — 185,913 478,880,650 — — Total Current 402,716 185,913 478,880,650 — 20,038,433 Equity instruments — — — 2,628,501 — Derivative instruments — — — — 30,789,703 Other financial assets — — 36,182,399 — — Total Non-current — — 36,182,399 2,628,501 30,789,703 Total 402,716 185,913 515,063,049 2,628,501 50,828,136 December 31, 2016 Financial assets held for trading (*) Held-to-maturity investments (*) Loans and receivables Available-for-sale financial assets Financial derivatives for hedging ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Derivative instruments — — — — 121,443 Other financial assets — 462,801 464,235,411 — — Total Current — 462,801 464,235,411 — 121,443 Equity instruments — — — 2,641,620 — Derivative instruments — — — — 25,533,189 Other financial assets — 652,733 33,500,105 — — Total Non-current — 652,733 33,500,105 2,641,620 25,533,189 Total — 1,115,534 497,735,516 2,641,620 25,654,632 (*) See note 7. The book value of trade accounts receivable and payable approximates their fair value. b) The detail of financial liabilities, classified by type and category, as of December 31, 2017 and 2016, is as follows: December 31, 2017 Financial liabilities held for trading Loans and payables Financial derivatives for hedging ThCh$ ThCh$ ThCh$ Interest-bearing loans — 17,255,692 — Derivative instruments 1,255,478 — 304,278 Other financial liabilities — 670,642,077 — Total Current 1,255,478 687,897,769 304,278 Interest-bearing loans — 760,932,929 — Derivative instruments — — 21,045,216 Other financial liabilities — 978,342 — Total Non-current — 761,911,271 21,045,216 Total 1,255,478 1,449,809,040 21,349,494 December 31, 2016 Financial liabilities held for trading Loans and payables Financial derivatives for hedging ThCh$ ThCh$ ThCh$ Interest-bearing loans — 18,013,114 — Derivative instruments 7,369,481 — 313,571 Other financial liabilities — 617,955,794 — Total Current 7,369,481 635,968,908 313,571 Interest-bearing loans — 802,046,968 — Derivative instruments 2,987,830 — 48,981,953 Other financial liabilities — 1,734,640 — Total Non-current 2,987,830 803,781,608 48,981,953 Total 10,357,311 1,439,750,516 49,295,524 20.2 Derivative instruments The risk management policy of the Group uses primarily interest rate and foreign exchange rate derivatives to hedge its exposure to interest rate and foreign currency risks. The Group classifies its derivatives as follows: • Cash flow hedges: • Fair value hedges: • Non-hedge derivatives: a) Assets and liabilities for hedge derivative instruments As of December 31, 2017 and 2016, financial derivative transactions qualifying as hedge instruments resulted in recognition of the following assets and liabilities in the consolidated statement of financial position: December 31, 2017 Assets Liabilities Current Non-current Current Non-current ThCh$ ThCh$ ThCh$ ThCh$ Exchange rate hedge: 20,038,433 30,789,703 304,278 21,045,216 Cash flow hedge 20,038,433 30,789,703 304,278 21,045,216 Total 20,038,433 30,789,703 304,278 21,045,216 December 31, 2016 Assets Liabilities Current Non-current Current Non-current ThCh$ ThCh$ ThCh$ ThCh$ Exchange rate hedge: 121,443 25,533,189 313,571 48,981,953 Cash flow hedge 121,443 25,533,189 313,571 48,981,953 Total 121,443 25,533,189 313,571 48,981,953 General information on hedge derivative instruments Hedge derivative instruments and their corresponding hedged instruments are shown in the following table: Detail of hedging Description of hedging instrument Description of hedged item Fair value of hedged item Fair value of hedged item Type of risk hedged instrument 12-31-2017 12-31-2016 ThCh$ ThCh$ SWAP Exchange rate Unsecured obligations (bonds) (*) 7,696,061 (23,640,892 ) Cash Flow FORWARD Exchange rate Revenues 21,782,581 — Cash Flow (*) See note 18.2. For the years ended December 31, 2017, 2016 and 2015, the Group did not recognize gains or losses for ineffective cash flow hedges. The Group has not entered into any fair value hedges for any of the periods reported. b) Financial derivative instrument assets and liabilities at fair value through profit or loss As of December 31, 2017 and 2016, financial derivative transactions recorded at fair value through profit or loss, resulted in the recognition of the following assets and liabilities in the statement of financial position: December 31, 2017 December 31, 2016 Current Assets Current Liabilities (*) Non-Current Assets Non-Current Liabilities (*) Current Assets Current Liabilities (*) Non-Current Assets Non-Current Liabilities (*) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Non-hedging derivative instrument 402,716 1,255,478 — — — 7,369,481 — 2,987,830 (*) See note 18. These derivative instruments correspond to forward contracts entered into by the Group, whose purpose is to hedge the exchange rate risk related to future obligations arising from civil works contracts linked to the construction of the Los Cóndores Financial Instruments: Recognition and Measurement. c) Other information on derivatives: The following tables present the fair value of hedging and non-hedging derivatives entered into by the Group as well as the remaining contractual maturities as of December 31, 2017 and 2016: December 31, 2017 Notional Amount Fair value Less than 1 year 1-2 years 2-3 years 3-4 years 4-5 years Total Financial derivatives ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Interest rate hedge: — — — — — — — Cash flow hedge — — — — — — — Exchange rate hedge: 29,478,642 306,350,419 525,812,635 — — — 832,163,054 Cash flow hedge 29,478,642 306,350,419 525,812,635 — — — 832,163,054 Derivatives not designated for hedge accounting (852,762 ) 19,682,638 — — — — 19,682,638 Total 28,625,880 326,033,057 525,812,635 — — — 851,845,692 December 31, 2016 Notional Amount Fair value Less than 1 year 1-2 years 2-3 years 3-4 years 4-5 years Total Financial derivatives ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Interest rate hedge: — — — — — — — Cash flow hedge — — — — — — — Exchange rate hedge: (23,640,892 ) — — 523,686,966 — — 523,686,966 Cash flow hedge (23,640,892 ) — — 523,686,966 — — 523,686,966 Derivatives not designated for hedge accounting (10,357,311 ) 49,738,751 21,434,625 — — — 71,173,376 Total (33,998,203 ) 49,738,751 21,434,625 523,686,966 — — 594,860,342 The hedging and non-hedging derivatives contractual maturities do not represent the Group’s total risk exposure, as the amounts presented in the above tables have been drawn up based on undiscounted contractual cash inflows and outflows for their settlement. 20.3 Fair value hierarchy Financial instruments recognized at fair value in the consolidated statement of financial position are classified, based on the hierarchy described in Note 3.h. The following table presents financial assets and liabilities measured at fair value as of December 31, 2017 and 2016: Fair Value Measured at End of 12-31-2017 Level 1 Level 2 Level 3 Financial Instruments Measured at Fair Value ThCh$ ThCh$ ThCh$ ThCh$ Financial Assets: Financial derivatives designated as cash flow hedges 50,828,136 — 50,828,136 — Financial derivatives not designated for hedge accounting 402,716 — 402,716 — Commodity derivatives not designated as cash flow hedges 9,940,955 — 9,940,955 — Commodity derivatives designated as cash flow hedges 5,742,633 — 5,742,633 Available-for-sale financial assets, non-current 33,158 33,158 — — Total 66,947,598 33,158 66,914,440 — Financial Liabilities: Financial derivatives designated as cash flow hedges 21,349,494 — 21,349,494 — Financial derivatives not designated for hedge accounting 1,255,478 — 1,255,478 — Commodity derivatives not designated for hedge accounting — — — — Commodity derivatives designated as cash flow hedges 889,026 — 889,026 — Total 23,493,998 — 23,493,998 — Fair Value Measured at End of 12-31-2016 Level 1 Level 2 Level 3 Financial Instruments Measured at Fair Value ThCh$ ThCh$ ThCh$ ThCh$ Financial Assets: Financial derivatives designated as cash flow hedges 25,654,632 — 25,654,632 — Commodity derivatives not designated for hedge accounting 875,841 — 875,841 — Commodity derivatives designated as cash flow hedges 16,159,565 — 16,159,565 — Available-for-sale financial assets, non-current 25,381 25,381 — — Total 42,715,419 25,381 42,690,038 — Financial Liabilities: Financial derivatives designated as cash flow hedges 49,295,524 — 49,295,524 — Financial derivatives not designated for hedge accounting 10,357,311 — 10,357,311 — Commodity derivatives not designated for hedge accounting 40,013 — 40,013 — Commodity derivatives designated as cash flow hedges 1,063,193 — 1,063,193 — Total 60,756,041 — 60,756,041 — 20.3.1 Financial instruments whose fair value measurement is classified as Level 3. The Group does not have any financial instruments whose fair value measurement is classified as Level 3.

Trade and Other Current Payable

Trade and Other Current Payables	12 Months Ended
	Dec. 31, 2017
Trade And Other Payables [Abstract]
Trade and Other Current Payables	21. TRADE AND OTHER CURRENT PAYABLES. The detail of Trade and Other Current Payables as of December 31, 2017 and 2016, is as follows: Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Trade and other payables ThCh$ ThCh$ ThCh$ ThCh$ Energy suppliers (*) 172,042,187 140,739,018 — — Fuel and gas suppliers 13,300,051 18,024,696 — — Subtotal Trade Payables 185,342,238 158,763,714 — — Other Payables Dividends payable to third parties 95,150,149 97,094,197 — — Payables for goods and services 170,859,517 166,241,384 4,485 40,256 Payable for assets acquisition 71,248,286 74,869,722 — — Warranty deposits 402,107 378,562 — Taxes payables other than income tax 17,648,643 11,581,921 — — VAT debit 25,766,224 22,396,497 — — Accounts payable to staff 27,466,888 28,952,388 — — Other payables 614,554 1,226,898 655,339 1,442,857 Subtotal Other Payables 409,156,368 402,741,569 659,824 1,483,113 Total 594,498,606 561,505,283 659,824 1,483,113 (*) As of December 31, 2017, Enel Distribución Chile S.A. has accrued ThCh$ 4,501,709 (ThCh$4,367,657 as of December 31, 2016) for payable expenses to generation companies due to delays in the publication of the decrees on Short-Term Node Prices and settlement of Average Node Prices. See Note 19.4 for the description of the liquidity risk management policy. The detail of trade payables, both non-past due and past due as of December 31, 2017 and 2016, are presented in Appendix 7.

Provisions

Provisions	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Provisions [Abstract]
Provisions	22. PROVISIONS. a) The breakdown of provisions as of December 31, 2017 and 2016, is as follows: Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Provisions ThCh$ ThCh$ ThCh$ ThCh$ Provision for legal proceedings (1) 3,497,786 4,694,579 13,936,190 5,308,206 Decommissioning or restoration (2) — — 64,486,647 57,798,702 Other provisions 2,138,385 1,798,953 — — Total 5,636,171 6,493,532 78,422,837 63,106,908 (1) Provision for legal proceedings mainly consist of the contingencies related to lawsuits on administrative sanctions from our regulators. (2) Provision for decommissioning or restorations arises from the Bocamina II project and San Isidro Power Plant. The expected timing and amount of any cash outflows related to the above provisions is uncertain and depends on the final resolution of the provisioned matters. b) Changes in provisions as of December 31, 2017 and 2016, are as follows: Legal Proceedings Decommissioning or Restoration Environment and Other Provisions Total Changes in Provisions ThCh$ ThCh$ ThCh$ ThCh$ Balance at January 1, 2017 10,002,785 57,798,702 1,798,953 69,600,440 Increase (decrease) in existing provisions (1) 12,159,920 4,340,858 339,432 16,840,210 Provisions used (2,995,017 ) — — (2,995,017 ) Reversal of unused provision (1,728,788 ) — — (1,728,788 ) Increase from adjustment to time value of money (2) — 2,347,087 — 2,347,087 Foreign currency translation (4,924 ) — — (4,924 ) Total changes in provisions 7,431,191 6,687,945 339,432 14,458,568 Balance at December 31, 2017 17,433,976 64,486,647 2,138,385 84,059,008 Legal Proceedings Decommissioning or Restoration Other Provisions Total Changes in Provisions ThCh$ ThCh$ ThCh$ ThCh$ Balance at January 1, 2016 14,829,364 51,085,542 6,530,429 72,445,335 Increase (decrease) in existing provisions 111,723 4,161,948 (4,731,476 ) (457,805 ) Provisions used (4,948,439 ) — — (4,948,439 ) Increase from adjustment to time value of money — 2,551,212 — 2,551,212 Foreign currency translation 10,137 — — 10,137 Total changes in provisions (4,826,579 ) 6,713,160 (4,731,476 ) (2,844,895 ) Balance at December 31, 2016 10,002,785 57,798,702 1,798,953 69,600,440 (1) The increase in existing provisions in the year 2017 it is mainly due to sanctions taken by the Superintendency of Electricity and Fuels to Enel for an amount of ThCh $ 11,840,322. See note 35. (2) See Note 31.

Employee Benefit Obligations

Employee Benefit Obligations	12 Months Ended
	Dec. 31, 2017
Disclosure Of Defined Benefit Plans [Abstract]
Employee Benefit Obligations	23. EMPLOYEE BENEFIT OBLIGATIONS. 23.1 General i The Group provides various post-employment benefits for all or some of their active or retired employees. These benefits are calculated and recorded in the financial statements according to the criteria described in Note 3.l.1, and include primarily the following: Defined benefit plans: • Complementary pension • Employee severance indemnities • Electricity • Health benefit 23.2 Details, changes and presentation in financial statements: a) The post-employment obligations associated with the defined benefits plan as of December 31, 2017, 2016 and 2015, are as follows: General ledger accounts: 12-31-2017 12-31-2016 12-31-2015 ThCh$ ThCh$ ThCh$ Post-employment obligations 57,081,924 59,934,127 55,023,456 Total 57,081,924 59,934,127 55,023,456 Total post-employment obligations, net 57,081,924 59,934,127 55,023,456 b) The following amounts were recognized in the consolidated statement of comprehensive income for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Expense Recognized in the Statement of Comprehensive Income ThCh$ ThCh$ ThCh$ Current service cost for defined benefits plan 2,091,205 1,899,660 2,282,226 Interest cost for defined benefits plan 2,678,300 2,517,406 2,299,944 Expenses recognized in the Statement of Income 4,769,505 4,417,066 4,582,170 Gains (losses) from remeasurement of defined benefit plans (1,716,875 ) 6,618,514 5,645,532 Total expense recognized in the Statement of Comprehensive Income 3,052,630 11,035,580 10,227,702 c) The balance and changes in post-employment defined benefit obligations as of and for the years ended December 31, 2017, 2016 and 2015, are as follows: Actuarial Value of Post-employment Obligations ThCh$ Balance at January 1, 2015 53,937,842 Current service cost 2,282,226 Net Interest cost 2,299,944 Actuarial (gains) losses from changes in financial assumptions 2,549,816 Actuarial (gains) losses from changes in experience adjustments 3,095,716 Foreign currency translation (697 ) Benefits paid (9,008,811 ) Other (132,580 ) Balance at December 31, 2015 55,023,456 Current service cost 1,899,660 Net Interest cost 2,517,406 Actuarial (gains) losses from changes in financial assumptions 1,073,475 Actuarial (gains) losses from changes in experience adjustments 5,545,039 Benefits paid (7,771,781 ) Transfers of employees 1,337,621 Other 309,251 Balance at December 31, 2016 59,934,127 Current service cost 2,091,205 Net Interest cost 2,678,300 Actuarial (gains) losses from changes in financial assumptions (1,414,201 ) Actuarial (gains) losses from changes in experience adjustments (302,674 ) Benefits paid (5,917,552 ) Transfers of employees 12,719 Balance at December 31, 2017 57,081,924 23.3 Other disclosures: • Actuarial assumptions: As of December 31, 2017, 2016 and 2015, the following assumptions were used in the actuarial calculation of defined benefits: 12-31-2017 12-31-2016 12-31-2015 Discount rates used 5.00% 4.70% 5.00% Expected rate of salary increases 4.00% 4.00% 4.00% Turnover rate 4.57% 4.72% 4.89% Mortality tables CB-H-2014 / RV-M-2014 CB-H-2014 / RV-M-2014 RV-2009 • Sensitivity As of December 31, 2017 and 2016, the sensitivity value of the actuarial liability for post-employment benefits to variations of 100 basis points in the discount rate assumes a decrease of ThCh$4,269,704 and ThCh$4,665,915, respectively, if the rate rises, and an increase of ThCh$4,773,942 and ThCh$5,241,395, respectively, if the rate falls. • Future disbursements The estimates available indicate that ThCh$5,558,032 will be disbursed for defined benefit plans in the next year. • Term of commitments The Group’s obligations have a weighted average length of 9.18 years, and the flow for benefits for the next five years and more is expected to be as follows: Years ThCh$ 1 5,558,032 2 4,970,959 3 4,203,682 4 5,105,974 5 4,917,461 Over 5 22,844,851

Equity

Equity	12 Months Ended
	Dec. 31, 2017
Disclosure Of Shareholders Equity [Abstract]
Equity	24. EQUITY. 24.1 Equity attributable to the shareholders of Enel Chile The issued capital of the Company for the year ended December 31, 2017 is Ch$2,229,108,974,538 divided into 49,092,772,762 shares. The Company was initially incorporated on January 22, 2016 under the name of Enersis Chile S.A. and its shares began to be traded on the Santiago Stock Exchange, the Electronic Stock Exchange, the Valparaíso Stock Exchange, and the New York Stock Exchange, on April 21, 2016. For more information on the general background of Enel Chile, See Note 1, During the years ended December 31, 2017 and 2016, the Group did not engage in any transaction of any kind with potential dilutive effects leading to diluted earnings per share that could differ from basic earnings per share. 24.2 Dividends Dividend No. Type of Dividend Payment Date Pesos per Share Charged to 1 Final 05-24-2016 2.09338 2015 2 Interim 01-27-2017 0.75884 2016 3 Final 05-26-2017 2.47546 2016 4 Interim 01-26-2018 0.75642 2017 24.3 Foreign currency translation reserves The following table sets forth foreign currency translation adjustments attributable to the shareholders of the Company for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Reserves for Accumulated Currency Translation Differences ThCh$ ThCh$ ThCh$ GasAtacama Chile S.A. (1) 6,416,189 8,484,094 9,582,184 Electrogas (2) — — 1,875,303 GNL Chile S.A. 560,194 738,839 328,447 GNL Quintero S.A. (3) — — 637,758 TOTAL 6,976,383 9,222,933 12,423,692 (1) From 1 January 2015, there was a change in the functional currency for this entity from the US dollar to the Chilean peso. (2) See Note 5. (3) See Note 12.b). 24.4 Restrictions on consolidated subsidiaries transferring funds to the parent Certain of the Group’s subsidiaries must comply with financial ratio covenants which require them to have a minimum level of equity or other requirements that restrict the transferring of assets to the Company. The Group’s restricted net assets as of December 31, 2017 and 2016 from its subsidiary Enel Generación Chile S.A. totaled ThCh$456,844,078 and ThCh$458,309,294, respectively. 24.5 Other reserves Other reserves within Equity attributable to Enel Chile for the years ended December 31, 2017, 2016 and 2015 are as follows: Balance at January 1, 2017 2017 Changes Balance at December 31, 2017 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 9,222,933 (2,246,550 ) 6,976,383 Cash flow hedges (b) (76,218,470 ) 43,368,734 (32,849,736 ) Available-for-sale financial assets 9,955 1,329 11,284 Other miscellaneous reserves (c) (969,740,120 ) (1,728,359 ) (971,468,479 ) Other comprehensive income from non-current assets held for Sale (d) 1,632,724 (1,632,724 ) — TOTAL (1,035,092,978 ) 37,762,430 (997,330,548 ) Balance at January 1, 2016 2016 Changes Balance at December 31, 2016 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 12,423,692 (3,200,759 ) 9,222,933 Cash flow hedges (b) (121,503,052 ) 45,284,582 (76,218,470 ) Available-for-sale financial assets 14,835 (4,880 ) 9,955 Other comprehensive income from non-current assets held for sale (d) — 1,632,724 1,632,724 Other miscellaneous reserves (c) (849,525,427 ) (120,214,693 ) (969,740,120 ) TOTAL (958,589,952 ) (76,503,026 ) (1,035,092,978 ) Balance at January 1, 2015 2015 Changes Balance at December 31, 2015 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 11,443,966 979,726 12,423,692 Cash flow hedges (b) (66,850,863 ) (54,652,189 ) (121,503,052 ) Available-for-sale financial assets 14,046 789 14,835 Other miscellaneous reserves (c) (873,486,367 ) 23,960,940 (849,525,427 ) TOTAL (928,879,218 ) (29,710,734 ) (958,589,952 ) a) Exchange differences on translation: These reserves arise primarily from exchange differences relating to: (i) Translation of the financial statements of our subsidiaries from their functional currencies to our presentation currency (i.e. Chilean peso) (see Note 2.7.3). b) Cash flow hedging reserves: These reserves represent the cumulative effective portion of gains and losses recognized in cash flow hedges (see Note 3.g.5 and 3.h). c) Other miscellaneous reserves The main items and their effects are the following: For the years ended 2017 2016 2015 Other Miscellaneous Reserves ThCh$ ThCh$ ThCh$ Reserve for corporate reorganization ("Spin-Off") (i) (534,057,733 ) (532,330,290 ) (421,335,641 ) Reserve for transition to IFRS (ii) (457,221,836 ) (457,221,836 ) (457,221,836 ) Reserve for subsidiaries transactions (iii) 12,502,494 12,502,494 12,502,494 Other Miscellaneous Reserves (iv) 7,308,596 7,309,512 16,529,556 TOTAL (971,468,479 ) (969,740,120 ) (849,525,427 ) (i) Reserve for corporate reorganization (“Spin-Off”) : Corresponds to the effects from the corporate reorganization of the Company, as described in Note 1, and the separation of the foreign business in Enel Américas. This reserve includes the effect of the taxes that Enel Generación Chile (formerly named Endesa Chile) and Enel Distribución Chile (formerly named Chilectra Chile) paid in Peru for transferring their investments to Endesa Américas and Chilectra Américas. The tax payments made by Enel Generación Chile, in March 2016, and Enel Distribución Chile, in April 2016, were 577 million Soles (ThCh$100,978,571) and 74 million Soles (ThCh$15,193,186), respectively. The calculation basis for determining the tax corresponds to the difference between the market value of the investments, to the date of the transfer, and the cost of tax acquisition of the participations. The net economic effect on the opening equity was ThCh$90,274,727. It should be noted that, being directly linked to the split transaction, the accounting record of this tax has been made directly in equity, specifically in Other reserves, following the nature of the main transaction (transaction with shareholders), (See Notes 1 and 2). (ii) Reserve for transition to IFRS : In accordance with Official Bulletin No. 456 from the CMF, included in this line item is the monetary correction corresponding to the accumulated paid-up capital from the date of our transition to IFRS, January 1, 2004, to December 31, 2008. (iii) Reserve for subsidiaries transactions (iv) Other miscellaneous reserves from transactions made in prior years. 24.6 Non-controlling Interests The detail of non-controlling interests is as follows: Non-controlling Interests Equity Profit (Loss) 12-31-2017 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 Companies % ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Enel Distribución Chile S.A. 0.91% 6,223,363 6,441,611 5,751,343 961,490 1,210,871 1,294,111 Enel Generación Chile S.A. 40.02% 784,999,394 680,725,188 590,091,089 167,465,216 173,299,349 84,976,889 Empresa Eléctrica Pehuenche S.A. 7.35% 9,963,472 10,008,502 10,900,863 5,649,253 6,512,893 8,674,207 Sociedad Agrícola de Cameros Ltda. 42.50% 2,596,764 2,636,470 2,675,177 (39,706 ) (38,707 ) 191,838 Other (205,346 ) (209,417 ) (199,191 ) (984 ) 126,845 (7,291 ) TOTAL 803,577,647 699,602,354 609,219,281 174,035,269 181,111,251 95,129,754

Revenue and Other Operating Inc

Revenue and Other Operating Income	12 Months Ended
	Dec. 31, 2017
Disclosure Of Revenue And Other Operating Income [Abstract]
Revenue and Other Operating Income	25. REVENUE AND OTHER OPERATING INCOME. The detail of revenues for the years ended December 31, 2017, 2016 and 2015, is as follows: For the years ended December 31, 2017 2016 2015 Revenues ThCh$ ThCh$ ThCh$ Energy sales 2,268,459,154 2,312,643,619 2,247,363,757 Generation 1,082,749,256 1,141,725,803 1,134,450,921 Regulated customers 726,166,640 805,079,958 726,264,558 Non-regulated customers 285,623,737 234,641,908 264,113,111 Spot market sales 70,958,879 102,003,937 140,339,722 Other customers — — 3,733,530 Distribution 1,185,709,898 1,170,917,816 1,112,912,836 Residential 442,137,827 431,610,828 407,435,626 Business 386,608,105 379,037,776 350,157,120 Industrial 225,736,231 229,878,875 230,416,697 Other consumers (1) 131,227,735 130,390,337 124,903,393 Other sales 107,362,797 73,607,457 32,057,524 Natural gas sales 91,652,707 64,443,715 12,582,771 Sales of products and services 15,710,090 9,163,742 19,474,753 Revenue from other services 114,648,227 129,592,804 104,871,908 Tolls and transmission 39,812,005 51,014,073 37,958,975 Metering equipment leases 4,945,609 4,555,779 4,415,191 Public lighting 13,449,852 12,660,894 10,859,012 Engineering and consulting services 3,414,472 14,304,336 1,817,284 Other services (2) 53,026,289 47,057,722 49,821,446 Total Revenues 2,490,470,178 2,515,843,880 2,384,293,189 Other Operating Income ThCh$ ThCh$ ThCh$ Mutual support — — 14,563 Commodity derivatives 20,328,649 10,794,682 1,820,371 Other income (3) 18,548,051 14,928,257 12,901,017 Total other income 38,876,700 25,722,939 14,735,951 (1) For the year ended December 31, 2017, it includes revenues from energy sales to municipalities of ThCh$36,165,698; government entities of ThCh$20,080,121 and agricultural sector entities of ThCh$5,811,319, and other of ThCh$ (2) For the year ended December 31, 2017, it includes services for construction of junctions of ThCh$15,514,433; works in specific facilities and networks of ThCh$15,125,128; and other services of ThCh$22,386,728. For the year ended December 31, 2016, it includes services for construction of junctions of ThCh$14,359,194; works in specific facilities and networks of ThCh$21,397,176; and other services of ThCh$11,301,352. For the year ended December 31, 2015, it includes services for construction of junctions of ThCh$16,289,581; works in specific facilities and networks of ThCh$16,736,234; and other services of ThCh$11,741,987. (3) For the year ended December 31, 2017, it includes revenues from energy losses recoveries of ThCh$1,968,203; revenues from outdated collection of invoices of ThCh$1,299,470; and revenues from other services of ThCh$15,280,378. For the year ended December 31, 2016, it includes revenues from energy losses recoveries of ThCh$1,344,529; revenues from outdated collection of invoices of ThCh$1,540,348; and revenues from other services of ThCh$12,043,380. For the year ended December 31, 2015, it mainly related to revenues from water sales of ThCh$823,821; and revenues from other services for ThCh$4,877,987.

Raw Materials and Consumables U

Raw Materials and Consumables Used	12 Months Ended
	Dec. 31, 2017
Analysis Of Income And Expense [Abstract]
Raw Materials and Consumables Used	26. RAW MATERIALS AND CONSUMABLES USED. The detail of raw materials and consumables used for the years ended December 31, 2017, 2016 and 2015, is as follows: For the years ended December 31, 2017 2016 2015 Raw materials and consumables used ThCh$ ThCh$ ThCh$ Energy purchases (902,434,871 ) (891,746,884 ) (860,203,181 ) Fuel consumption (280,739,362 ) (295,148,838 ) (327,502,996 ) Transportation costs (155,879,249 ) (195,123,118 ) (182,453,155 ) Other raw materials and consumables (182,102,035 ) (115,400,740 ) (111,826,227 ) Total (1,521,155,517 ) (1,497,419,580 ) (1,481,985,559 )

Employee Benefits Expense

Employee Benefits Expense	12 Months Ended
	Dec. 31, 2017
Classes Of Employee Benefits Expense [Abstract]
Employee Benefits Expense	27. EMPLOYEE BENEFITS EXPENSE. Employee expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Employee Benefits Expense ThCh$ ThCh$ ThCh$ Wages and salaries (100,653,880 ) (100,938,761 ) (115,982,152 ) Post-employment benefit obligations expense (2,091,205 ) (1,899,660 ) (2,282,226 ) Social security and other contributions (18,758,692 ) (21,260,007 ) (18,290,343 ) Total (121,503,777 ) (124,098,428 ) (136,554,721 )

Depreciation, Amortization and

Depreciation, Amortization and Impairment Losses	12 Months Ended
	Dec. 31, 2017
Disclosure Of Depreciation Amortization And Impairment [Abstract]
Depreciation, Amortization and Impairment Losses	28. DEPRECIATION, AMORTIZATION AND IMPAIRMENT LOSSES. The detail of depreciation, amortization and impairment losses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 ThCh$ ThCh$ ThCh$ Depreciation (145,873,065 ) (155,826,620 ) (148,421,514 ) Amortization (6,811,041 ) (5,833,990 ) (4,780,148 ) Subtotal (152,684,106 ) (161,660,610 ) (153,201,662 ) Impairment (Losses) Reversals (*) (7,937,817 ) (35,926,710 ) 3,054,903 Total (160,621,923 ) (197,587,320 ) (150,146,759 ) Balance as of (*) Impairment Losses Generation Distribution Total 2017 2016 2015 2017 2016 2015 2017 2016 2015 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Impairment losses of financial assets (See Note 8.d) 55,494 — (371,558 ) (7,993,311 ) (5,141,179 ) (6,738,750 ) (7,937,817 ) (5,141,179 ) (7,110,308 ) Impairment losses of property, plant and equipment (See Note 15) — (30,785,531 ) 10,165,211 — — — — (30,785,531 ) 10,165,211 Total 55,494 (30,785,531 ) 9,793,653 (7,993,311 ) (5,141,179 ) (6,738,750 ) (7,937,817 ) (35,926,710 ) 3,054,903

Other Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2017
Disclosure Of Cost And Expenses By Nature [Abstract]
Other Expenses	29. OTHER EXPENSES. Other miscellaneous operating expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Other Expenses ThCh$ ThCh$ ThCh$ Other supplies and services (17,064,008 ) (23,962,717 ) (16,365,050 ) Professional, outsourced and other services (58,622,123 ) (55,571,694 ) (43,006,875 ) Repairs and maintenance (13,999,283 ) (11,030,522 ) (14,034,924 ) Indemnities and fines (776,011 ) (3,046,557 ) (1,754,069 ) Taxes and charges (5,105,235 ) (4,972,995 ) (7,406,215 ) Insurance premiums (13,277,718 ) (17,148,278 ) (15,942,047 ) Leases and rental costs (2,969,436 ) (3,250,503 ) (10,098,166 ) Marketing, public relations and advertising (2,501,027 ) (3,736,414 ) (3,166,181 ) Written-off Huechún and Chillán projects (*) — (36,480,223 ) — Written-off projects in progress (*) (25,105,911 ) — — Other supplies (11,188,148 ) (6,132,681 ) (6,041,038 ) Travel expenses (3,445,944 ) (3,190,662 ) (4,103,471 ) Environmental expenses (7,769,230 ) (2,245,891 ) (3,939,361 ) Total (161,824,074 ) (170,769,137 ) (125,857,397 ) (*) See Note 15.e).ix).

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Gains Net [Abstract]
Other Gains (Losses)	30. OTHER GAINS (LOSSES). Other gains (losses) for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Other Gains (Losses) ThCh$ ThCh$ ThCh$ Gain on sale of building (Alonso de Cordova) — — 14,610,544 Gain on sale of Tunel El Melón — — 4,207,167 Gain on sale of GNL Quintero S.A. (**) — 121,325,018 — Gain on sale of Electrogas (*) 105,311,912 — — Gain on sale of investment properties — — 1,463,163 Gain on sale of assets 7,779,531 — — Other 149,753 165,044 (225,129 ) Total 113,241,196 121,490,062 20,055,745 (*) See Note 5. (**) See Note 12.

Financial Results

Financial Results	12 Months Ended
	Dec. 31, 2017
Financial Results [Abstract]
Financial Results	31. FINANCIAL RESULTS. Financial income and costs for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Financial Income ThCh$ ThCh$ ThCh$ Income from deposits and other financial instruments 8,377,023 5,733,428 2,566,017 Interests charged to customers in energy accounts and billing 8,556,587 — — Other financial income 4,729,078 17,372,473 12,704,152 Total Financial Income 21,662,688 23,105,901 15,270,169 For the years ended December 31, 2017 2016 2015 Financial Costs ThCh$ ThCh$ ThCh$ Financial Costs (53,510,882 ) (58,199,382 ) (66,700,698 ) Bank loans (12,585 ) (2,034,277 ) (131,502 ) Secured and unsecured obligations (42,708,253 ) (44,268,489 ) (51,697,708 ) Financial leasing (811,172 ) (780,953 ) (1,039,013 ) Valuation of financial derivatives (1,067,820 ) (824,922 ) (1,725,211 ) Financial provisions (1) (2,347,087 ) (2,551,211 ) (1,881,826 ) Post-employment benefit obligations (2) (2,678,300 ) (2,517,406 ) (2,299,944 ) Debt formalization expenses and other associated expenses (836,174 ) — — Capitalized borrowing costs 4,078,463 3,001,211 2,221,329 Other financial costs (7,127,954 ) (8,223,335 ) (10,146,823 ) Loss from indexed assets and liabilities (*) 916,666 1,631,840 4,839,077 Foreign currency exchange differences (**) 8,516,874 12,978,471 (51,277,332 ) Total Financial Costs (44,077,342 ) (43,589,071 ) (113,138,953 ) Total Financial Results (22,414,654 ) (20,483,170 ) (97,868,784 ) (1) See note 22. (2) See note 23. (*) and (**) The effects on financial results from exchange differences and the application of indexed assets and liabilities originated from the following: For the years ended December 31, 2017 2016 2015 Profit (losses) from Indexed Assets and Liabilities (*) ThCh$ ThCh$ ThCh$ Other financial assets 4,659,933 7,237,000 10,153,342 Other non-financial assets — — 840,108 Trade and other receivables 155,158 1,077,086 745,270 Current tax assets and liabilities 1,654,538 2,349,415 6,052,524 Other financial liabilities (financial debt and derivative instruments) (5,551,163 ) (9,014,858 ) (12,864,959 ) Trade and other payables (1,800 ) (16,803 ) (73,133 ) Other provisions — — (14,075 ) Total 916,666 1,631,840 4,839,077 For the years ended December 31, 2017 2016 2015 Foreign Currency Exchange Differences (**) ThCh$ ThCh$ ThCh$ Cash and cash equivalents 2,931,086 240,451 5,021,381 Other financial assets 10,895,862 25,476,638 10,637,768 Trade and other receivables 390,764 2,595,997 10,313,151 Current tax assets and liabilities (188,270 ) — — Other financial liabilities (financial debt and derivative instruments) (4,358,937 ) (18,538,354 ) (30,533,746 ) Trade and other payables (1,152,505 ) 3,203,739 (46,715,886 ) Other non-financial liabilities (1,126 ) — — Total 8,516,874 12,978,471 (51,277,332 )

Information by Segment

Information by Segment	12 Months Ended
	Dec. 31, 2017
Disclosure Of Segment Assets And Segment Liabilities [Abstract]
Information by Segment	32. INFORMATION BY SEGMENT 32.1 Basis of segmentation The Group’s activities operate under a matrix management structure with dual and cross management responsibilities (based on businesses), and its subsidiaries are engaged in either the Generation Business or the Distribution Business . The Group adopted a “bottom-up” approach to determine its reportable segments. The Generation and the Distribution reportable segments have been defined based on IFRS 8.9 and on the criteria described in IFRS 8.12. Generation Business: The Generation Reportable Segment is comprised of a group of electricity companies that own electricity generating plants, whose energy is transmitted and distributed to end customers. The Generation Business is conducted by our subsidiaries Enel Generación Chile S.A., Empresa Eléctrica Pehuenche S.A. and GasAtacama Chile S.A.. Distribution Business: The Distribution Reportable Segment is comprised of a group of electricity companies operating under a public utility concession, with service obligations and regulated tariffs for supplying regulated customers . The Distribution Business is conducted by our subsidiary Enel Distribución Chile S.A. and its subsidiaries. Each of the operating segments generates separate financial information, which is aggregated into one combined set of information for the Generation Business, and another set of combined information for the Distribution Business at the reportable segment level. In addition, in order to assist the decision maker process, the Planning & Control Department at the Parent Company level prepares internal reports containing combined information at the reportable segment level about the main key performance indicators (KPIs), such as: EBITDA, Gross Margin, Total Capex, Total Opex, Net income, Total Energy Generation, among others. The presentation of information under this business approach has been made taking into consideration that the KPIs are similar and comparable in all segments, in each of the following aspects: (a) the nature of the activities: Generation on one hand, and Distribution on the other; (b) the nature of the production processes: the Generation Business deals with the generation of electricity, while the Distribution Business does not generate electricity, but distributes electricity to end customers; (c) the type or class of customer for their products and services: the Generation Business provides services mainly to unregulated customers, while the Distribution Business provides energy to regulated customers; (d) the methods used to distribute their products or provide their services: generators generally sell the energy through energy auctions, while distributors provide energy in their concession area; and (e) the nature of the regulatory environment (public utilities): the regulatory frameworks differs in the Generation Business and Distribution Business The Company’s chief operating decision maker (CODM) in conjunction with the Chile manager reviews on a monthly basis these internal reports and uses the KPI information to make decisions on the allocation of resources and the assessment of the performance of the operating segments for each reportable segment. The information disclosed in the following tables is based on the financial information of the companies forming each segment. The accounting policies used to determine the segment information are the same as those used in the preparation of the Group’s consolidated financial statements. The following tables present details of this information by segment: 32.2 Generation, distribution and others Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ASSETS ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ CURRENT ASSETS 662,804,360 543,372,955 261,378,069 245,122,733 135,159,356 78,031,249 1,059,341,785 866,526,937 Cash and cash equivalents 211,027,141 114,486,479 42,594,390 23,378,615 165,834,495 108,134,098 419,456,026 245,999,192 Other current financial assets 20,523,276 487,106 61,887 47,517 41,899 49,621 20,627,062 584,244 Other current non-financial assets 2,167,272 4,409,288 3,434,462 11,091,061 400,408 331,137 6,002,142 15,831,486 Trade and other current receivables 218,178,007 260,440,086 197,011,114 180,290,279 4,563,165 4,341,491 419,752,286 445,071,856 Current accounts receivable from related companies 109,797,820 82,727,781 6,305,806 8,895,440 (44,247,580 ) (38,764,837 ) 71,856,046 52,858,384 Inventories 31,740,903 33,390,799 3,049,576 1,878,072 4,896,463 2,270,725 39,686,942 37,539,596 Current tax assets 65,164,708 34,438,408 8,920,834 19,541,749 3,670,506 1,669,014 77,756,048 55,649,171 Non-current assets classified as held for sale 4,205,233 12,993,008 — — — — 4,205,233 12,993,008 NON-CURRENT ASSETS 2,891,657,830 2,856,309,537 893,633,579 829,203,115 850,139,814 846,671,423 4,635,431,223 4,532,184,075 Other non-current financial assets 33,391,398 28,802,569 26,806 24,973 — — 33,418,204 28,827,542 Other non-current non-financial assets 12,853,460 12,318,444 959,679 1,019,050 — (1,342 ) 13,813,139 13,336,152 Trade and other non-current receivables 1,032,922 6,788,437 34,272,234 24,978,209 877,243 1,733,459 36,182,399 33,500,105 Investments accounted for using the equity method 12,707,221 18,738,198 — 60,325 — (60,325 ) 12,707,221 18,738,198 Intangible assets other than goodwill 18,607,972 19,266,874 34,236,891 25,430,420 2,326,041 (226,544 ) 55,170,904 44,470,750 Goodwill 24,860,356 24,860,356 2,240,478 2,240,478 860,156,821 860,156,821 887,257,655 887,257,655 Property, plant and equipment 2,788,204,501 2,726,838,536 821,234,672 774,999,730 (23,752,036 ) (25,709,632 ) 3,585,687,137 3,476,128,634 Investment property — — — — 8,356,772 8,128,522 8,356,772 8,128,522 Deferred tax assets — 18,696,123 662,819 449,930 2,174,973 2,650,464 2,837,792 21,796,517 TOTAL ASSETS 3,554,462,190 3,399,682,492 1,155,011,648 1,074,325,848 985,299,170 924,702,672 5,694,773,008 5,398,711,012 Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 LIABILITIES AND EQUITY ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ CURRENT LIABILITIES 543,356,500 555,777,465 408,687,871 259,684,837 (135,227,725 ) (58,215,655 ) 816,816,646 757,246,647 Other current financial liabilities 18,815,434 25,696,064 14 102 — — 18,815,448 25,696,166 Trade and other current payables 329,448,226 341,088,664 189,458,076 151,549,875 75,592,304 68,866,744 594,498,606 561,505,283 Current accounts payable to related companies 122,862,944 121,018,039 207,909,593 96,520,909 (211,159,565 ) (127,110,019 ) 119,612,972 90,428,929 Other current provisions 5,296,635 6,493,428 — 104 339,536 — 5,636,171 6,493,532 Current tax liabilities 66,933,261 61,457,940 94,246 113,855 — 27,620 67,027,507 61,599,415 Other current non-financial liabilities — 23,330 11,225,942 11,499,992 — — 11,225,942 11,523,322 NON-CURRENT LIABILITIES 1,022,091,736 1,114,144,775 61,965,918 106,283,505 6,937,051 (41,957,557 ) 1,090,994,705 1,178,470,723 Other non-current financial liabilities 781,978,145 854,016,751 — — — — 781,978,145 854,016,751 Trade and other non-current payables 632,642 1,453,022 27,182 30,091 — — 659,824 1,483,113 Non-current accounts payable to related companies 318,518 251,527 — 50,000,180 — (50,000,180 ) 318,518 251,527 Other long-term provisions 63,992,567 57,325,914 14,430,270 5,780,994 — — 78,422,837 63,106,908 Deferred tax liabilities 160,293,916 185,277,004 18,786,185 20,502,853 (6,856,420 ) (6,415,063 ) 172,223,681 199,364,794 Non-current provisions for employee benefits 14,875,948 15,820,557 28,412,505 29,655,884 13,793,471 14,457,686 57,081,924 59,934,127 Other non-current non-financial liabilities — — 309,776 313,503 — — 309,776 313,503 EQUITY 1,989,013,954 1,729,760,252 684,357,859 708,357,506 1,113,589,844 1,024,875,884 3,786,961,657 3,462,993,642 Equity attributable to Enel Chile 1,989,013,954 1,729,760,252 684,357,859 708,357,506 1,113,589,844 1,024,875,884 2,983,384,010 2,763,391,288 Issued capital 552,777,321 552,777,321 230,137,980 230,137,980 1,446,193,674 1,446,193,674 2,229,108,975 2,229,108,975 Retained earnings 1,398,018,156 1,199,429,221 769,928,443 794,856,204 (416,341,016 ) (424,910,134 ) 1,751,605,583 1,569,375,291 Share Premium 85,511,492 — 354,220 — (85,865,712 ) — — Other reserves (47,293,015 ) (22,446,290 ) (316,062,784 ) (316,636,678 ) 169,602,898 3,592,344 (997,330,548 ) (1,035,092,978 ) Non-controlling interests — — — — — — 803,577,647 699,602,354 Total Liabilities and Equity 3,554,462,190 3,399,682,492 1,155,011,648 1,074,325,848 985,299,170 924,702,672 5,694,773,008 5,398,711,012 The holdings, eliminations and others column corresponds to transactions between companies in different lines of business, primarily purchases and sales of energy and services. Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF COMPREHENSIVE INCOME ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ REVENUES AND OTHER OPERATING INCOME 1,634,937,087 1,659,727,329 1,543,812,461 1,333,027,456 1,315,760,852 1,257,732,165 (438,617,665 ) (433,921,362 ) (402,515,486 ) 2,529,346,878 2,541,566,819 2,399,029,140 Revenues 1,599,032,140 1,639,959,816 1,539,991,519 1,328,791,205 1,310,175,226 1,247,900,614 (437,353,167 ) (434,291,162 ) (403,598,944 ) 2,490,470,178 2,515,843,880 2,384,293,189 Energy sales 1,457,671,722 1,516,688,442 1,474,818,366 1,186,795,410 1,172,700,558 1,112,912,836 (376,007,978 ) (376,745,382 ) (340,367,445 ) 2,268,459,154 2,312,643,618 2,247,363,757 Other sales 94,452,287 64,638,599 24,293,133 12,741,568 8,968,859 7,769,616 168,942 — (5,225 ) 107,362,797 73,607,458 32,057,524 Other services rendered 46,908,131 58,632,775 40,880,020 129,254,227 128,505,809 127,218,162 (61,514,131 ) (57,545,780 ) (63,226,274 ) 114,648,227 129,592,804 104,871,908 Other operating income 35,904,947 19,767,513 3,820,942 4,236,251 5,585,626 9,831,551 (1,264,498 ) 369,800 1,083,458 38,876,700 25,722,939 14,735,951 RAW MATERIALS AND CONSUMABLES USED (903,978,006 ) (895,060,114 ) (880,891,222 ) (1,062,076,646 ) (1,042,329,385 ) (983,732,902 ) 444,899,135 439,969,919 382,638,565 (1,521,155,517 ) (1,497,419,580 ) (1,481,985,559 ) Energy purchases (346,954,692 ) (335,731,822 ) (320,731,795 ) (938,067,783 ) (936,965,119 ) (881,589,779 ) 382,587,604 380,950,057 342,118,393 (902,434,871 ) (891,746,884 ) (860,203,181 ) Fuel consumption (280,739,362 ) (295,148,838 ) (327,502,995 ) — — — — — — (280,739,362 ) (295,148,838 ) (327,502,995 ) Transportation expenses (152,869,838 ) (192,502,995 ) (179,691,471 ) (63,009,956 ) (60,454,433 ) (60,901,746 ) 60,000,545 57,834,310 58,140,062 (155,879,249 ) (195,123,118 ) (182,453,155 ) Other miscellaneous supplies and services (123,414,114 ) (71,676,459 ) (52,964,961 ) (60,998,907 ) (44,909,833 ) (41,241,377 ) 2,310,986 1,185,552 (17,619,890 ) (182,102,035 ) (115,400,740 ) (111,826,228 ) CONTRIBUTION MARGIN 730,959,081 764,667,215 662,921,239 270,950,810 273,431,467 273,999,263 6,281,470 6,048,557 (19,876,921 ) 1,008,191,361 1,044,147,239 917,043,581 Other work performed by the entity and capitalized 7,226,484 9,758,304 15,250,811 6,630,130 6,338,547 5,753,242 532,373 1 — 14,388,987 16,096,852 21,004,053 Employee benefits expense (54,222,470 ) (60,350,072 ) (70,969,357 ) (38,449,551 ) (35,557,457 ) (32,454,962 ) (28,831,756 ) (28,190,899 ) (33,130,402 ) (121,503,777 ) (124,098,428 ) (136,554,721 ) Other expenses (102,821,020 ) (119,303,215 ) (90,327,960 ) (61,942,592 ) (52,077,948 ) (62,182,651 ) 2,939,538 612,026 26,653,214 (161,824,074 ) (170,769,137 ) (125,857,397 ) GROSS OPERATING INCOME 581,142,075 594,772,232 516,874,733 177,188,797 192,134,609 185,114,892 (19,078,375 ) (21,530,315 ) (26,354,109 ) 739,252,497 765,376,526 675,635,516 Depreciation and amortization expense (117,337,553 ) (132,600,381 ) (124,835,559 ) (36,685,324 ) (30,399,304 ) (29,082,449 ) 1,338,771 1,339,075 716,346 (152,684,106 ) (161,660,610 ) (153,201,662 ) Impairment losses (reversal of impairment losses) recognized in profit or loss 55,494 (30,785,531 ) 9,793,653 (7,993,311 ) (5,141,179 ) (6,738,750 ) — — — (7,937,817 ) (35,926,710 ) 3,054,903 OPERATING INCOME 463,860,016 431,386,320 401,832,827 132,510,162 156,594,126 149,293,693 (17,739,604 ) (20,191,240 ) (25,637,763 ) 578,630,574 567,789,206 525,488,757 FINANCIAL RESULT (36,610,248 ) (35,678,632 ) (114,252,182 ) 6,411,837 8,579,316 12,294,531 7,783,757 6,616,146 4,088,867 (22,414,654 ) (20,483,170 ) (97,868,784 ) Financial income 5,273,672 6,150,751 234,822 12,894,635 14,289,185 13,308,032 3,494,381 2,665,965 1,727,315 21,662,688 23,105,901 15,270,169 Cash and cash equivalents 3,077,708 2,150,797 152,518 1,975,564 1,680,365 634,961 3,323,751 — 1,778,538 8,377,023 3,831,162 2,566,017 Other financial income 2,195,964 3,999,954 82,304 10,919,071 12,608,820 12,673,071 170,630 2,665,965 (51,223 ) 13,285,665 19,274,739 12,704,152 Financial costs (50,851,829 ) (55,701,778 ) (64,206,719 ) (7,094,366 ) (6,488,659 ) (1,801,829 ) 4,435,313 3,991,055 (692,150 ) (53,510,882 ) (58,199,382 ) (66,700,698 ) Bank borrowings (261 ) (2,033,835 ) (129,350 ) (12,299 ) (476 ) (1,659 ) (25 ) — (494 ) (12,585 ) (2,034,311 ) (131,503 ) Secured and unsecured obligations (42,708,253 ) (44,268,489 ) (51,697,708 ) — — — — — — (42,708,253 ) (44,268,489 ) (51,697,708 ) Other (8,143,315 ) (9,399,454 ) (12,379,661 ) (7,082,067 ) (6,488,183 ) (1,800,170 ) 4,435,338 3,991,055 (691,656 ) (10,790,044 ) (11,896,582 ) (14,871,487 ) Profit (loss) from indexed assets and liabilities 145,608 606,075 3,600,187 761,262 974,891 973,087 9,796 50,874 265,803 916,666 1,631,840 4,839,077 Foreign currency exchange differences 8,822,301 13,266,320 (53,880,472 ) (149,694 ) (196,101 ) (184,759 ) (155,733 ) (91,748 ) 2,787,899 8,516,874 12,978,471 (51,277,332 ) Positive 19,563,838 48,546,664 26,738,738 58,288 609,359 (235,571 ) 134,942 65,643 3,930,935 19,757,068 49,221,666 30,434,102 Negative (10,741,537 ) (35,280,344 ) (80,619,210 ) (207,982 ) (805,460 ) 50,812 (290,675 ) (157,391 ) (1,143,036 ) (11,240,194 ) (36,243,195 ) (81,711,434 ) Share of profit of associates accounted for using the equity method (2,696,904 ) 7,878,201 8,905,045 — 1,818 5,248 — (1,819 ) (5,248 ) (2,696,904 ) 7,878,200 8,905,045 Other gains (losses) 113,088,869 121,490,974 4,015,401 157,458 (831 ) 14,660,351 (5,131 ) (81 ) 1,379,993 113,241,196 121,490,062 20,055,745 Gain (loss) from other investments 105,462,769 121,457,430 4,309,205 4,026 (831 ) — (5,131 ) (81 ) (346 ) 105,461,664 121,456,518 4,308,859 Gain (loss) from the sale of property, plant and equipment 7,626,100 33,544 (293,804 ) 153,432 — 14,660,351 — — 1,380,339 7,779,532 33,544 15,746,886 Income before tax 537,641,733 525,076,863 300,501,091 139,079,457 165,174,429 176,253,823 (9,960,978 ) (13,576,994 ) (20,174,151 ) 666,760,212 676,674,298 456,580,763 Income tax (112,099,519 ) (83,216,935 ) (76,655,819 ) (34,030,322 ) (32,589,362 ) (36,956,051 ) 2,787,540 4,403,115 3,999,271 (143,342,301 ) (111,403,182 ) (109,612,599 ) Net income from continuing operations 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income from discontinued operations — — — — — — — — — — — — NET INCOME 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income attributable to: 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Shareholders of Enel Chile — — — — — — — — — 349,382,642 384,159,865 251,838,410 Non-controlling interests — — — — — — — — — 174,035,269 181,111,251 95,129,754 Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF CASH FLOWS ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Cash flows from (used in) operating activities 488,157,362 490,177,558 428,211,622 170,628,958 148,354,968 194,756,025 (23,182,620 ) (23,847,670 ) (46,436,120 ) 635,613,720 614,684,856 576,531,527 Cash flows from (used in) investing activities (91,867,647 ) (34,631,759 ) (255,251,615 ) (74,464,531 ) (55,007,620 ) (82,947,418 ) 19,886,401 26,150,787 41,457,686 (146,465,777 ) (63,488,592 ) (296,741,347 ) Cash flows from (used in) financing activities (301,835,211 ) (374,835,378 ) (175,094,207 ) (76,923,085 ) (88,519,047 ) (98,304,569 ) 61,162,775 17,487,453 (43,674 ) (317,595,521 ) (445,866,972 ) (273,442,450 ) The holdings, eliminations and others column corresponds to transactions between companies in different lines of business, primarily purchases and sales of energy and services

Third Party Guarantees, Other C

Third Party Guarantees, Other Contingent Assets and Liabilities, and Other Commitments	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Provisions [Abstract]
Third Party Guarantees, Other Contingent Assets and Liabilities, and Other Commitments	33. THIRD PARTY GUARANTEES, OTHER CONTINGENT ASSETS AND LIABILITIES, AND OTHER COMMITMENTS. 33.1 Direct guarantees. As of December 31, 2017 and 2016, the Group had future energy purchase commitments amounting to ThCh$ 33.2 Indirect guarantees Debtor Outstanding balance as of Type Contract Maturity Creditor of Guarantee Company Relationship Type of Guarantee Currency 12-31-2017 12-31-2016 Secured Bonds Serie B October 2028 Bondholders of Enel Américas' Bonds Enel Américas S.A. Entities demerged from original debtor Enersis S.A. (codebtor Enel Chile S.A.) (1) Codebtor USD 31,294 33,449 Total 31,294 33,449 (1) As a result of the Enersis’ Spin-Off and in accordance with the bond indenture, all entities arising from the demerger are liable for the debt, regardless that the payment obligation remains in Enel Américas S.A. 33.3 Lawsuits and Arbitration Proceedings. As of the date of these consolidated financial statements, the most relevant litigation involving the Company and its subsidiaries are as follows: 1. Enel Generación Chile S.A. 1.1. In 2005, three lawsuits were filed against Enel Generación Chile S.A., the Chilean Treasury and the Chilean Water Authority (DGA, in its Spanish acronym), which are currently being treated as a single proceeding, requesting that DGA Resolution No. 134, which established non-consumptive water rights in favor of Enel Generación Chile S.A. to build the Neltume hydroelectric power plant project be declared null as a matter of public policy, with compensation for damages. Alternatively, the lawsuits request the compensation for damages for the losses allegedly sustained by the plaintiffs due to the loss of their status as riparian owners along Pirihueico Lake, as well as due to the devaluation of their properties. The defendants have rejected these allegations, contending that the DGA Resolution complies with all legal requirements, and that the exercise of this right does not cause any detriment to the plaintiffs, among other arguments. The sums involved in these suits are undetermined. This case was joined with two other cases: the first one is captioned “Arrieta v. the State and Others” in the 9th Civil Court, docket 15279-2005 and the second is captioned “Jordán v. the State and Others,” in the 10th Civil Court, docket 1608-2005. With regard to these cases, an injunction has been ordered against entering into any acts and contracts concerning Enel Generación Chile S.A.’s water rights related to the Neltume project. On September 25, 2014, the Court of Law issued an unfavorable ruling against Enel Generación Chile S.A. that in essence declared the right to use water established by DGA Resolution No. 134 illegal and orders its cancellation in the corresponding Water Rights Register of the correspondent Real Estate Registrar. Enel Generación Chile S.A. filed an appeal and cassation resources with the Santiago Court of Appeals, which are still pending. In parallel, on June 9, 2017 the Court of Appeals issued a complementary ruling rejecting the claims for compensation for damages on the ground that there were no damages affecting the defendants, Enel Generación Chile S.A. filed an appeal, which is still pending resolution. . 2. GasAtacama Chile S.A. 2.1. On May 23, 2016 the Superintendency of Electricity and Fuels by means of ORD No. 5,705, filed charges against GasAtacama Chile S.A., for providing allegedly erroneous information to national centralizing operating agent CDEC-SING regarding the Minimum Technical (MT) and Average Time of Operation (TMO) parameters during the period from January 1, 2011 to October 29, 2015, GasAtacama Chile S.A. submitted its objections, which were rejected through notification by the Superintendency’s Resolution No. 014606 dated August 4, 2016, setting a fine for UTM 120,000. Disagreeing with the Superintendency’s resolution applying the fine in question, GasAtacama Chile S.A. filed an appeal for reinstatement filed before the Superintendency, which was rejected by the Superintendency through Resolution No. 15908, dated November 2, 2016, confirming the totality of the fine imposed. In opposition to the aforementioned resolution, GasAtacama Chile S.A. filed an illegality claim before the Court of Appeals of Santiago, recognizing a provision for 25% of the fine. To date, the claim of illegality is pending resolution by the Court of Appeals of Santiago. The loss contingency rating on this issue is probable because although the contingency was assessed on the basis that the fine imposed does not meet the legal requirement, nevertheless we had to make provisions for 50% of the fine, for the single fact of the application of the fine by the State Regulator. The basis for recognizing half of the risk lies in the fact that we have sued the Superintendence of Electricity and Fuels, before the Courts of Justice, requesting the annulment of the fine because it has no legal basis. 3. Enel Distribución Chile S.A. 3.1. The attorney, Ms. Nicole Vasseur Porcel, as legal representative of Ms. Camila Paz Castillo Abarca and her daughter Ms. Kimora Belén Fernández Castillo, and Ms. Graciela Rodríguez Mundaca, filed a lawsuit against Enel Distribución Chile for a total amount of ThCh$600,000 (ThCh$200,000 each) for alleged punitive damages due to death of her spouse, father and son, respectively, Mr. Javier Fernández Rodríguez, occurred on February 21, 2012 as a result of the injuries suffered by the fall of a street lighting pole on him after a truck passing through hooked the power lines attached to such a pole and caused it to fall. On February 24, 2016, Enel Distribución Chile requested the abandonment of the legal action and the reopening of the case. On March 2, 2016, the Court ruled to reopen the case, but the request for abandonment of the legal action was pending. On June 6, 2016, the case was reopened and the request for abandonment of the procedure was still pending resolution. 3.2. Ms. Evelyn del Carmen Molina González, on her behalf and on behalf or her under-age daughters Maite Alué Letelier Molina and Daniela Anaís Letelier Molina, filed a lawsuit against Chilectra S.A. (now Enel Distribución Chile S.A.) and its subcontractor Sociedad de Servicios Personales para el Área Eléctrica Limitada (“SSPAEL”)for a total amount of ThCh$2,000,000 for alleged punitive damages due to death of her spouse and father, respectively, Mr. David Letelier Rivera, which occurred on May 25, 2013 as a result of the injuries suffered by electrocution and falling from a street lightning pole while working. Chilectra S.A filed dilatory exceptions which are still pending resolution by the court, and it is waiting for the demand to be legally notified to the co-defendant SSPAEL, On July 4, 2016, Chilectra S.A requested the court to issue a resolution on the dilatory exceptions filed on November 16, 2014. On September 13, 2016, the defendants presented rejoinders. On October 25, 2016, the court summoned the parties to a conciliation hearing, which occurred on December 12, 2016, without reaching an agreement. On January 27, 2017, the case was received for trial. On June 27, 2017, after finalizing the evidence period, the court submitted the observations to the evidence. On September 12, 2017, the parties were summoned to hear sentence and the defendants filed an appeal against this ruling, which is still pending resolution. The sentence was delivered on November 7, 2017 and found SSPAEL and Enel Distribución Chile jointly liable to pay the sum of ThCh$ 90,000 for moral damages to the plaintiffs, plus readjustments and costs. On November 24, 2017 Chilectra S.A. filed an appeal against the ruling, raising the antecedents to the I.C.A. of Santiago on December 4, 2017. 3.3. Ms. Ximena Acevedo Herrera, Benjamín Jiménez Acevedo, Francisco Jiménez Acevedo, Nancy Garrido Muñoz, Juan Carlos Jiménez Rocuant, Carolina Jiménez Garrido and Natalia Jiménez Garrido filed a lawsuit against Ingeniería Eléctrica Azeta Ltda and Enel Distribución Chile S.A. for a total amount of ThCh$878,227 for alleged punitive damages due to the death of their spouse, father, son, and brother, Mr. Juan Pablo Jiménez Garrido, which occurred on February 22, 2013 as a result of a head trauma caused by a bullet. Enel Distribución Chile is a defendant in its capacity as contractor of Azeta. The discussion period has been finalized. On November 23, 2017, the court noticing an error, invalidated the conciliation hearing, therefore the citation to it is pending notification. On this ground the plaintiff filed an appeal for reconsideration with subsidiary appeal against this resolution, the latter being granted. 3.4. Mr. Víctor Hugo Coronado González; Ms. Francia Magali Bustos Uribe, both on their behalf and on behalf of the under-age daughter Nicolson Rocío Coronado Bustos, and Víctor Ignacio Coronado Bustos, filed a lawsuit against Enel Distribución Chile for a total amount of ThCh$704,860 for alleged punitive damages due to the accident that occurred on June 22, 2015 and affected Mr. Víctor Hugo Coronado González who received an electrical discharge and suffered severe injuries. On August 18, 2017, Enel Distribución ChileS.A. filed dilatory exceptions, with notice being given to the plaintiff on August 29. These were finally rejected, with Enel Distribución Chile S.A. appealing on October 30, 2017. On November 6, 2017, Enel Distribución Chile S.A. filed the plea for the defense. On December 22, 2017, the rebuttal was made. 3.5. A class action lawsuit sponsored by the National Consumer Board (SERNAC) for alleged breach of the collective, diffuse interest of the consumers as provided for in the Consumer Protection Law, for which they petitioned that Enel Distribución Chile S.A. should be fined for the breach of the above law, and also that it should be sentenced to paying compensation for damages caused to all of the consumers as a result of the interruption of the supply that affected a large part of the Metropolitan Region Distribution Center as a result of the inclement weather front, specifically a snowstorm, in July 2017. On November 13, 2017, Enel Distribución Chile filed the plea for the defense and the summons to the reconciliation hearing is pending. 3.6. By means of Exempted Resolution 21,036 of November 3, 2017, the Superintendency of Electricity and Fuels confirmed the fine of 35,611 Monthly Tax Units imposed on Enel Distribución Chile S.A., when it ruled against the appeal for reconsideration of judgment filed on January 14, 2016, against Exempted Resolution 11,750 of December 29, 2015 because it considered that, in the period 2013-2014, Enel Distribución Chile had repeatedly exceeded the supply continuity indices stipulated in the law. Enel Distribución Chile filed a remedy of complaint against this ruling with the Santiago Court of Appeals. 3.7. By means of Exempted Resolution 21,129 of November 9, 2017, the Superintendency of Electricity and Fuels confirmed the fine of 2000 Monthly Tax Units imposed on Enel Distribución Chile S.A., when it ruled against the appeal for reconsideration of judgment filed on December 20, 2016 against Exempted Resolution 16,475 of December 7, 2016 because it considered that Enel Distribución Chile did not fulfill its obligation to keep its facilities in a good state of repair and in conditions that prevented any danger to people or things, with regard to the incident that occurred in the Lord Cochrane substation on April 17, 2016. Enel Distribución filed a remedy of complaint against this ruling with the Santiago Court of Appeals. The management of the Company considers that the provisions recorded in the consolidated financial statements are adequate to cover the risks resulting from litigation described in this Note. It does not consider there to be any additional liabilities other than those specified. Given the characteristics of the risks covered by these provisions, it is not possible to determine a reasonable schedule of payment dates if there are any. 33.4 Financial restrictions. As of December 31, 2017, the Company, on a stand-alone basis, had no debt obligations and was therefore not subject to any covenants or events of default. However, a number of the Group’s subsidiaries’ loan agreements, include the obligation to comply with certain financial ratios, which is normal in contracts of this nature. There are also affirmative and negative covenants requiring the monitoring of these commitments. In addition, there are restrictions in the events-of-default clauses of the agreements which require compliance. 1. Cross Default Some of the financial debt contracts of Enel Generación Chile contain cross default clauses, The credit line agreement governed by Chilean law, which Enel Generación Chile signed in March 2016 for UF 2.8 million, stipulates that cross default is only triggered in the event of non-compliance by the borrower itself, i.e., Enel Generación Chile, with no reference made to its subsidiaries. In order to accelerate payment of the debt in this credit line due to cross default originated from other debt, the amount in default must exceed US$50 million, or the equivalent in other currencies, and other additional conditions must be met such as the expiration of any grace periods. Since being signed, this credit line has not been used. Enel Generación Chile’s international credit line governed by New York State law, which was signed in February 2016 expiring in February 2020, also makes no reference to its subsidiaries, thus, cross default is only triggered in the event of non-compliance by the borrower itself. For the repayment of debt to be accelerated under these credit lines due to cross default originated from other debt, the amount in default must exceed US$50 million or its equivalent in other currencies, and other additional conditions must be met, including the expiration of grace periods (if any), and a formal notice of intent to accelerate the debt repayment must have been served by creditors representing more than 50% of the amount owed or committed in the contract. As of December 31, 2017, these credit lines have not been drawn upon. In relation to the bond issues of Enel Generación Chile registered with the SEC, commonly called “Yankee bonds”, a cross default can be triggered by another debt of the same company or of any of their subsidiaries, for any amount overdue provided that the principal of the debt giving rise to the cross default exceeds US$30 million or its equivalent in other currencies. Debt acceleration due to cross default does not occur automatically but has to be demanded by at least 25% of the bondholders of a certain series of Yankee bonds. The Yankee bonds of Enel Generación Chile mature in 2024, 2027, 2037 and 2097. For the specific Yankee bond that was issued in April 2014 with maturity in 2024, the threshold for triggering cross default increased to US$50 million or its equivalent in other currencies. As of December 31, 2017, the outstanding amount of the Yankee bonds was ThCh$ The Enel Generación Chile bonds issued in Chile state that cross default can be triggered only by the default of the issuer when the amount in default exceeds US$50 million or its equivalent in other currencies. Debt acceleration requires the agreement of at least 50% of the bondholders of a certain series. As of December 31, 2017, the outstanding amount of the local bonds was ThCh$324,822,376. 2. Financial covenants Financial covenants are contractual commitments with respect to minimum or maximum financial ratios that a company is obliged to meet at certain periods of time (quarterly, annually, etc.), and in certain cases upon compliance with certain conditions. Most of the financial covenants of the Group limit the level of indebtedness and evaluate the ability to generate cash flows in order to service the companies’ debts. Various companies are also required to certify these covenants periodically. The types of covenants and their respective limits vary based on debt and contract type. The Enel Generación Chile bonds issued in Chile include the following financial covenants whose definitions and calculation formulas are established in the respective indentures: Series H • Consolidated Debt Ratio: The consolidated debt ratio, which is Financial Debt to Capitalization, must be no more than 0.64. Financial debt is the sum of Interest-bearing loans, current; Interest-bearing loans, non-current; Other financial liabilities, current; Other financial liabilities, non-current; and Other obligations guaranteed by the issuer or its subsidiaries; while Capitalization is the sum of Financial liabilities and Total Equity. As of December 31, 2017, the ratio was 0.28. • Consolidated Equity: A minimum Equity of Ch$761,661 million must be maintained; this limit is adjusted at the end of each year as established in the indenture. Equity corresponds to Equity attributable to the shareholders of Enel Generación Chile. As of December 31, 2017, the equity of Enel Generación Chile was Ch$1,961,517,727 million. • Financial Expense Coverage: A financial expense coverage ratio of at least 1.85 must be maintained. Financial expense coverage is the quotient between i) the gross margin plus financial income and dividends received from investments in associates, and ii) financial expenses; both items refer to the period of four consecutive quarters ending on the quarter being reported. For the year ended December 31, 2017, this ratio was 11.55. • Net Asset Position with Related Companies: A net asset position with related companies of no more than US$100 million must be maintained. The Net asset position with related companies is the difference between i) the sum of current accounts receivable from related parties, non-current accounts receivable from related parties, less transactions in the ordinary course of business at less than 180 days term, short-term transactions of associates of Enel Generación Chile in which Enel Américas has no participation, and long-term transactions of associates of Enel Generación Chile in which Enel Américas has no participation; and ii) the sum of current accounts payable to related parties; non-current accounts payable to related parties, less transactions in the ordinary course of business at less than 180 days term; short-term transactions of associates of Enel Generación Chile in which Enel Américas has no participation; and long-term transactions of associates of Enel Generación Chile in which Enel Américas has no participation. As of December 31, 2017, using the exchange rate prevailing on that date, the Net asset position with related companies was a negative US$83.39 million, indicating that Enel Américas is a net creditor of Enel Generación Chile rather than a net debtor. Series M • Consolidated Debt Ratio: The consolidated debt ratio, which is Financial debt to Capitalization, must be no more than 0.64. Financial debt is the sum of Interest-bearing loans, current; Interest-bearing loans, non-current; Other financial liabilities, current; and Other financial liabilities, non-current; while Capitalization is the sum of Financial liabilities, Equity attributable to the shareholders of the Company and Non-controlling interests. As of December 31, 2017, the debt ratio was 0.28. • Consolidated Equity: Same as for Series H. • Financial Expense Coverage Ratio: Same as for Series H. Enel Generación Chile’s domestic (governed by Chilean law, maturity in April 2019) and international (governed by New York State law, maturity in July 2019 and February 2020) credit lines include the following covenants whose definitions and formulas, identical to each other, are established in the respective contracts: • Debt Equity Ratio: The debt equity ratio, which is Financial debt to Net Equity, must be no more than 1.4. Financial debt is the sum of Interest-bearing loans, current; Interest-bearing loans, non-current; while Net Equity is the sum of the Equity attributable to the shareholders of Enel Generación Chile, and Non-controlling interests. As of December 31, 2017, the ratio was 0.39. • Debt Repayment Capacity (Debt/EBITDA Ratio): The ratio between Financial Debt and EBITDA must be no more than 6.5. Financial Debt is the sum of interest-bearing loans, current; and interest-bearing loans, non-current; while EBITDA is the operating income excluding depreciation and amortization expense and impairment losses / (reversal of impairment losses) for the four mobile quarters ended on the calculation date. As of December 31, 2017, the Debt/EBITDA ratio was 1.34. Yankee bonds are not subject to financial covenants. As of December 31, 2017, the most restrictive financial covenant for Enel Generación Chile was the Debt Equity Ratio requirement for two credit lines. The other Group companies not mentioned in this Note, are not subject to compliance with financial covenants. Lastly, in most of the contracts, debt acceleration for non-compliance with these covenants does not occur automatically, but is subject to certain conditions, such as a cure period. As of December 31, 2017 and 2016, neither the Company nor any company of the Group was in default under their financial obligations summarized herein or other financial obligations whose defaults might trigger the acceleration of their financial commitments. 33.5 Other Information Enel Distribución Chile S.A. • On June 16, 2017, severe weather, including heavy rain and wind, affected the Santiago Metropolitan Region. The weather system resulted in trees and branches, roofs and advertising signs falling on the electric lines, cutting power to our customers. As a result of effect caused by this severe weather, automatic compensations to customers were triggered as required by law when interruption of electricity supply is over 20 hours. The compensations were applied in the following or subsequent month according to the billing cycles. In addition, Enel Distribución Chile granted an additional and extraordinary credit to those customers whose electric supply was interrupted for over 24 hours. The credit applied to customers in the billing was for up to Ch$25,000 per customer, which is equivalent to the monthly average consumption per client (240kWh/monthly). The total amount for the additional credit was ThCh$590,796, which has been recognized as an expense in these interim consolidated financial statements. On August 11, 2017, the Superintendency of Electricity and Fuels imposed a fine of 70,000 Monthly Tax Units (UTM) (ThCh$3,288,040) related to this severe weather event (See Note 35.3). • On July 15, 2017, intense rain and a snowstorm hit the Santiago Metropolitan Region. This severe weather resulted in trees and branches falling on the electric lines causing significant damage to the electric network infrastructure, cutting power to our customers. As a result of effect caused by this severe weather, automatic compensations to customers were triggered as required by law when interruption of electricity supply is over 20 hours. The compensations were applied in the following or subsequent month according to the billing cycles. Enel Distribución Chile granted an additional and extraordinary credit to those customers whose electric supply was interrupted for over 24 hours. The credit applied to customers in the billing will be for up to Ch$25,000 per customer. The estimate for the total amount related to the additional credit is ThCh$2,775,069, which has been recognized as an expense in these consolidated financial statements. On December 29, 2017, the Superintendency of Electricity and Fuels imposed three fines for a total of 110,000 UTM (ThCh$5,166,920) related to this severe weather event (See Note 35.3).

Personnel Figures

Personnel Figures	12 Months Ended
	Dec. 31, 2017
Number And Average Number Of Employees [Abstract]
Personnel Figures	34. PERSONNEL FIGURES The Company’s personnel as of December 31, 2017 and 2016, is distributed as follows: December 31, 2017 Country Managers and key executives Professionals and Technicians Staff others Total Annual Average Chile 63 1,747 113 1,923 1,968 Argentina — 23 2 25 25 Total 63 1,770 115 1,948 1,993 December 31, 2016 Country Managers and key executives Professionals and Technicians Staff others Total Annual Average Chile 62 1,709 213 1,984 1,988 Argentina — 24 2 26 27 Total 62 1,733 215 2,010 2,015

Sanctions

Sanctions	12 Months Ended
	Dec. 31, 2017
Sanctions [Abstract]
Sanctions	35. SANCTIONS. The following Group’s subsidiaries have received sanctions from administrative authorities: 1. Enel Generación Chile S.A. As of December 31, 2017, the illegal claims against Resolution No. 2658 of Bío Bío’s Health Secretary from the Health Ministry, that imposed a fine of 500 UTM (ThCh$23,347) for alleged infractions from Enel Generación Chile S.A. related to the asbestos removal approved by Health authority are still pending. Additionally, at the same date, it is still pending the reposition filed in the sanitary summary procedure initiated by the inspection document No. 0788, coming from the Antofagasta’s Health Secretary, which imposed on the company a fine of 200 UTM (ThCh$9,339), which payment is still pending. 2. GasAtacama Chile S.A. As of December 31, 2017, the Superintendency of Electricity and Fuels fined GasAtacama Chile S.A. for a total amount of 400UTM (ThCh$18,492). T It is also pending the resolution of an illegality claim filed by GasAtacama Chile S.A. against Superintendency of Electricity and Fuels Resolution No. 15908 “CELTA”, dated November 2, 2016. This resolution imposed a fine of 120,000UTM (ThCh$5,541,960). This sanction is currently being appealed before the Santiago Court of Appeals. Additionally, there are pending four non significants (ThCh$23,347) 3. Enel Distribución Chile S.A. As of December 31, 2017, it is pending the resolution of four claims filed by Enel Distribución Chile against four resolutions issued by Superintendency of Electricity and Fuels. That resolutions imposed a fine of 180,000 UTM (ThCh$ Also, it is still pending the resolution of an illegality claim filed by Enel Distribución Chile against Superintendency of Electricity and Fuels Resolution No. 13630 dated May 23, 2016. This resolution imposed a fine of 2,000 UTM (ThCh$93,944) for infractions related to improper maintenance of the facilities.

Environment

Environment	12 Months Ended
	Dec. 31, 2017
Environmental Matters [Abstract]
Environment	36. ENVIRONMENT. Environmental expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: 12-31-2017 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations. In progress 6,786 - 6,786 - 6,787 Enel Distribución Chile S.A. Vegetation Control In Redesat This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv. In progress 306,419 - 306,419 - 31/12/2017 306,419 Management Respel Dangerous waste management Finished 265 - 265 - 30/09/2017 265 Environmental management in Ssee Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter. In progress 239,285 - 239,285 18,644 257,929 Consider all the environmental work that is done inside and outside of SSEE, as fumigation, placement and/or repair of rodent baits, irrigation system repair, waste removal, environmental inspections, garden Finished 46,771 - 46,771 - 31/12/2017 46,771 Improvements in the Network M T/Bt Traditional network replacement by protected, concentric, other Finished 3,066,846 3,066,846 - 1,957,246 30/09/2017 5,024,092 Environmental Permits Baseline for Environmental Impact Study, execution RCA and normative, preparation of reports and sectoral permits. In progress 68,001 68,001 - 34,811 31/03/2018 102,812 Vegetation Control in Networks Mt/Bt Pruning of trees near the media network and low voltage. In progress 3,313,454 - 3,313,454 - 31/12/2017 3,313,454 Noise Control Noise measurement and electromagnetic fields in substation, lines and other facilities. In progress 786 - 786 - 31/12/2017 786 Asbestos Removal from Underground Cables Removal of fireproof tape with asbestos from the underground network MT. In progress 166,434 166,434 - 37,290 31/12/2017 203,724 Arborizations of Substations and Sat Line Forest management plans, reforestations, construction and maintenance of tree-lined belts in substation. In progress 251,740 251,740 - 20,390 31/12/2017 272,130 Gas Atacama Chile Environmental monitoring Environmental monitoring with SK Ecología operation and maintenance CEMS. In progress 1,463,204 - 1,463,204 - 1,463,204 Standardization Cems Normalización bodegas, gestión ambiental. In progress 1,021,630 1,021,630 - - 1,021,630 Eolica Canela Environmental expenditures in power plants Water quality analysis and monitoring and Higenization Canela In progress 18,347 - 18,347 - 18,347 Enel Generación Chile S.A. Environmental costs in combined cycle plants The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS. In progress 1,252,355 - 1,252,355 - 1,252,355 Environmental costs in thermal plants Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in thermoelectric plants (C.T.) In progress 870,281 - 870,281 - 870,281 Environmental costs in hydroelectric plants Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in hydroelectric power plants (C.H.) In progress 251,277 - 251,277 - 251,277 Ralco Hydroelectric Plant Reforestation according to the agreement with the Catholic University and Electrification of housing in Ayin Maipu. In progress 5,075,137 5,075,137 - - 5,075,137 Tal Tal Thermal Plant Dejection Nox TalTal: Engineering Civil Works and permits In progress 1,290,133 1,290,133 - - 1,290,133 El Toro Hydroelectric Plant Withdrawal Domestic and Industrial Waste In progress - - - - - Total 18,709,151 10,939,921 7,769,230 2,068,381 20,777,533 12-31-2016 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS). In progress 6,515 - 6,515 - 6,515 Gas Atacama Chile Studies, monitoring and disposal of waste Higenization, waste treatment, pest management and control system. Finished 78,221 - 78,221 - 78,221 Studies, monitoring and laboratory analysis Withdrawal and final disposal of solid waste in Thermal Power Plants In progress 169,743 - 169,743 - 169,743 Plant ZLD (studies) Plant ZLD (studies) Finished 13,470 13,470 - - 13,470 Coal plants Emission standard (Desox y Denox Tarapacá) In progress 27,648,451 27,648,451 - - 27,648,451 Eolica Canela Environmental expenditures in power plants Water quality analysis and monitoring and Higenization Canela In progress 94,770 - 94,770 - 94,770 Enel Generación Chile S.A. Environmental costs in combined cycle plants The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS. In progress 567,616 - 567,616 - 567,616 Environmental costs in thermal plants Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in thermoelectric plants (Thermal Power Plants) In progress 243,264 - 243,264 - 243,264 Environmental costs in hydroelectric plants Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in hydroelectric power plants (HPS) In progress 181,644 - 181,644 - 181,644 Ralco Hydroelectric Plant Plan Ralco: Reforestation according to the Agreement with the Catholic University and Electrification of housing in Ayin Maipu. In progress 4,497,330 4,497,330 - - 4,497,330 Tal Tal Thermal Plant Dejection Nox TalTal: Engineering Civil Works and permits It consists of the pruning of branches until reaching the safety conditions to which the foliage must be left with respect to the drivers. In progress 3,173,813 3,173,813 - - 3,173,813 Enel Distribución Chile S.A. Vegetation Control In Redesat Finished 38,475 - 38,475 - 38,475 Management RESPEL Consider the costs for the removal and treatment of Hazardous Waste (final destination) generated in maintenance activities AT Networks. Finished 1,955 - 1,955 - 1,955 Management RESSOL This activity contemplates the clearing and pruning of the MT / BT distribution networks close to the distribution networks. Finished 761,090 - 761,090 - 761,090 Environmental management in SSEE The service consists of the weeding and control of weeds in electric power substation enclosures in order to keep the enclosures free of weeds, ensuring a good operation of these facilities. Finished 50,686 - 50,686 - 50,686 Improvements in the Network M T/BT Space CAB and Pre-assembled. Finished 289,710 289,710 - - 289,710 Environmental permits Payments will correspond to environmental commitments in the RCA that environmentally authorizes the project: Noise measurements and sectoral permits for the storage of waste Finished 44,259 44,259 - 44,259 Project day Potentiation Line 110 kv Los Almendros, El Salto, Tap Los Dominicos section. In progress 8,856 8,856 - 5,068 30-06-2017 13,924 DGA Studies project "Powering Line 110 kv, Ochagavia-Florida, Section TAP Santa Elena-TAP Macul" and DIA Ochagavia-Florida Section Tap Santa, Tap Macul. Finished 6,150 6,150 - - 6,150 Improvements in the Network M T/BT The service consists in the maintenance of green areas with replacement of species and turf in substation enclosures of Chilectra. Finished 49,907 49,907 49,907 Noise Control This activity contemplates the maintenance of the easement strip of a high voltage line between 34.5 and 500 kv. Finished 513 - 513 - 513 Measurement of noise in Sta Raquel, La Reina, Cisterna and Sta. Maria substations. In progress 12,920 12,920 - - 12,920 Environmental Consulting Environmental Consulting and Calibration of Sonometer. Finished 1,492 - 1,492 - 1,492 Environmental permits Lo Espejo- Ochagavia Line Sectoral Environmental Permit Processing, Lo Espejo-Ochagavia Line, Tap Cisterna section Finished 989 989 - - 989 Total 37,941,840 35,695,948 2,245,891 5,068 37,946,908 12-31-2015 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations. In progress 16,877 - 16,877 - 16,877 Investments in Central Hydroelectric Plants Regularization fuel facilities; Regularization water and sewer system; Regularization collection wells; Fabrication and installation cubits acid spill; Normalization fenced site archeology In process 361,712 361,712 - - 361,712 Enel Distribución Chile S.A. Vegetation Control In Redesat This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv. Finished 79,956 - 79,956 982,347 31/12/2015 1,062,303 Management Respel Dangerous waste management Finished 3,377 - 3,377 - 3,377 Environmental management in Ssee Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter. Finished 112,437 - 112,437 - 112,437 Improvements in the Network M T/Bt Traditional network replacement by protected, concentric, other Finished 1,841,766 1,841,766 - - 1,841,766 Vegetation Control in Networks Mt/Bt Pruning of trees near the media network and low voltage. Finished 930,940 - 930,940 - 930,940 Noise Control Noise measurement and electromagnetic fields in substation, lines and other facilities. Finished 5,710 - 5,710 223,482 31/12/2015 229,192 Compañía Electrica Tarapacá S.A. Waste Studies, monitoring, laboratory analysis and waste disposal retirement Finished 196,060 - 196,060 - 196,060 Waste treatment Removal of non-hazardous household and industrial waste Finished 127,053 - 127,053 - 127,053 Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions Finished 9,624 9,624 - 9,624 Afforestation (RCA) Water Eyes Afforestation (RCA) Water Eyes Finished 27,032 27,032 - 27,032 Eolica Canela Central Environmental expenses Water quality analysis and monitoring and Higenization Canela In progress 11,376 - 11,376 - 11,376 Enel Generación Chile S.A. Central Environmental Costs Waste treatment, sanitation In progress 2,455,575 - 2,455,575 - 2,455,575 CT Bocamina Emissions monitoring, CEMS project, NOX abatement In progress 1,855 1,855 - - 1,855 Cems project Cems C.T. Quintero project, C.T. San Isidro II project and C.T. Tal Tal project In progress 61 61 - - 61 Regularizations C.H. Regularizations C.H. In progress 155,485 155,485 - - 155,485 Regularizations C.H. Ralco Social Afforestation Program and Restorations Palmucho Chenqueco bypass road; Bridge reconstruction Lonquimay. In progress 1,051,017 1,051,017 - - 1,051,017 Total 7,387,913 3,448,552 3,939,361 1,205,829 8,593,742

Summarized Financial Informatio

Summarized Financial Information of Subsidiaries	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Subsidiaries [Abstract]
Summarized Financial Information of Subsidiaries	37. SUMMARIZED FINANCIAL INFORMATION OF SUBSIDIARIES As of December 31, 2017 and 2016, summarized financial information of our principal subsidiaries is as follows: December 31, 2017 Type Statements Current Assets Non-Current Assets Total Assets Current Liabilities Non-Current Liabilities Equity Total Liabilities Revenues Raw Consumables Used Contribution Margin Gross Operating Income Operating Income Financial Results Income before Taxes Income Taxes Profit (Loss) Other Comprehensive Income Total Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Grupo Enel Distribución Chile S.A. Consolidated 261,378,069 893,633,580 1,155,011,649 408,687,866 61,965,918 684,357,865 1,155,011,649 1,333,027,456 (1,062,076,645) 270,950,811 177,188,798 132,510,164 6,411,839 139,079,732 (34,030,322) 105,049,408 1,515,176 106,564,584 Grupo Servicios Informaticos e Inmobiliarios Ltda. Consolidated - - - - - — - - - - (1) (1) - (1) - (1) - (1) Empresa Eléctrica Pehuenche S.A. Separate 35,369,243 186,760,346 222,129,589 38,310,560 48,261,590 135,557,439 222,129,589 152,501,383 (36,289,330) 116,212,053 110,957,039 103,556,904 (395,231) 103,206,672 (26,346,081) 76,860,591 - 76,860,591 Grupo Enel Generación Chile S.A. Consolidated 662,804,359 2,891,657,830 3,554,462,189 543,356,500 1,022,091,737 1,989,013,952 3,554,462,189 1,634,937,088 (903,978,007) 730,959,081 581,142,074 463,860,015 (36,610,248) 537,641,733 (112,099,519) 425,542,214 67,663,516 493,205,730 Grupo GasAtacama Chile S.A.. Consolidated 182,143,224 611,319,090 793,462,314 75,370,131 83,894,880 634,197,303 793,462,314 307,272,380 (170,752,796) 136,519,583 106,213,750 70,509,184 1,432,674 80,142,531 (25,417,139) 54,725,392 (3,338,115) 51,387,277 December 31, 2016 Type Statements Current Assets Non-Current Assets Total Assets Current Liabilities Non-Current Liabilities Equity Total Liabilities Revenues Raw Consumables Used Contribution Margin Gross Operating Income Operating Income Financial Results Income before Taxes Income Taxes Profit (Loss) Other Comprehensive Income Total Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Grupo Enel Distribución Chile S.A. Consolidated 245,122,732 829,203,115 1,074,325,847 259,684,836 106,283,505 708,357,506 1,074,325,847 1,315,760,851 (1,042,329,385) 273,431,466 192,134,608 156,594,125 8,579,317 165,174,429 (32,589,362) 132,585,067 (21,284,665) 111,300,402 Grupo Servicios Informaticos e Inmobiliarios Ltda. Consolidated 57,558,313 11,654,352 69,212,665 6,711,190 1,466,867 61,034,608 69,212,665 10,983,012 — 10,983,012 (674,755) (736,519) 2,565,301 1,828,782 (107,413) 1,721,370 — 1,721,370 Empresa Eléctrica Pehuenche S.A. Separate 35,730,340 193,496,141 229,226,481 43,012,321 50,044,060 136,170,100 229,226,481 155,568,982 (23,529,448) 132,039,534 125,454,246 116,789,055 24,333 116,813,388 (28,202,602) 88,610,786 — 88,610,786 Compañĺa Eléctrica Tarapacá S.A. Separate — — — — — — — 219,980,554 (139,960,874) 80,019,680 62,455,761 36,937,980 (2,519,836) 51,585,349 10,396,319 61,981,668 (924,812) 61,056,856 Grupo Enel Generación Chile S.A. Consolidated 543,372,956 2,856,309,537 3,399,682,493 555,777,465 1,114,144,776 1,729,760,252 3,399,682,493 1,659,727,329 (895,060,114) 764,667,215 594,772,233 431,386,321 (35,678,633) 525,076,864 (83,216,935) 441,859,929 (86,682,199) 355,177,730 Grupo GasAtacama Chile S.A.. Consolidated 194,264,349 663,665,991 857,930,340 86,380,336 89,573,088 681,976,916 857,930,340 173,489,754 (87,098,923) 86,390,831 67,795,883 45,426,269 6,453,677 53,666,618 (10,337,536) 43,329,082 (1,779,413) 41,549,669

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Disclosure Of Nonadjusting Events After Reporting Period [Abstract]
Subsequent Events	38. SUBSEQUENT EVENTS Enel Chile S.A.: In relation to the Renewable Assets Reorganization discussed in Note 1.2), the following significant events have ocurred subsequent to December 31, 2017: 1. On January 22, 2018, Enel Chile S.A. informed that the legal period for dissenting shareholders to exercise their withdrawal rights arising from the merger agreement of Enel Green Power Latin America S.A. into the Company (the “Merger”) approved at the Extraordinary Shareholders’ Meeting held on December 20, 2017 (the “ESM”) expired on January 19, 2018. During such period, and based on the information available as of this date, the shareholders that together represent a total of 1,024,251,979 common shares of the Company, or 2.09%, exercised their withdrawal rights. According to the relevant legal provisions and regulations and particularly Official Letter No 32,435 issued by the CMF dated November 7, 2017, the price of the shares of the shareholders that exercised their withdrawal rights will be paid by the Company as of the date the Merger is effective pursuant to the terms and conditions agreed upon by the ESM. The Company will inform on the aforementioned through a significant event. Consequently, one of the conditions precedent to the Merger has been satisfied, i.e., that the Enel Chile shareholders that exercise their withdrawal rights do not represent more than 5% of the Company’s common shares with voting rights, and that as a result of the exercise of such withdrawal rights, as of the date of expiration of the dissenting shareholders’ withdrawal rights, no shareholder exceeds the 65% maximum shareholding concentration limit established by the Enel Chile bylaws. This percentage is to be calculated considering the number of shares into which the new equity of Enel Chile will be divided, which was approved as part of the Merger and the capital increase required to have sufficient shares to deliver to Enel Generación shareholders within the Enel Generación Tender Offer context. 2. On February 8, 2018, Enel Chile S.A. commenced the preemptive rights subscription period, both in Chile and in the United States of America, of the 10,000,000,000 new common shares issuance associated with the $820,000,000,000 capital increase approved by the ESM, held on December 20, 2017. The notice of the preemptive rights to subscribe these shares, which sets the beginning of the preemptive rights subscription period was published in the El Mercurio de Santiago newspaper on the previously mentioned date. Pursuant to the ESM’s agreement and the terms and conditions of the Renewable Assets Reorganization, the shares that remain available once the preemptive rights subscription period ended were allocated to the shareholders of Enel Generación Chile S.A. (“Enel Generación”) that tendered their shares in the Enel Generación Tender Offer, as required by its terms and conditions. The effectiveness of this capital increase was subject to the conditions precedent approved by the ESM. In accordance with such approved conditions, the share subscription contract of the shareholders or third parties that decide to exercise their preemptive subscription rights during the preemptive rights subscription period will be conferred on the first business day of the month following the date in which the Company publishes the results notice declaring the Enel Generación Tender Offer successful as determined by article 212 of the Securities Market Law. The subscribers must pay for their shares on the respective contract subscription date, the same date in which the subscription contracts become effective and the shares are delivered to the subscriber. 3. As part of the same event described in item 2, Enel Chile S.A. commenced the Enel Generación Tender Offer, both in Chile and in the United States of America, to purchase all Enel Generación Chile shares that are not owned by Enel Chile and that represent 40.02% of all shares that represent the equity of Enel Generacion Chile. As stated by law, the terms and conditions of the Enel Generación Tender Offer was detailed in the tender commencement notice and prospectus. The Enel Generación Tender Offer commencement notice was published in two local newspapers, both on February 15, 2018. The Enel Generación Tender Offer was conducted for a period that that began on February 16 and concluded on March 22, 2018. 4. On March 25, 2018, in relation to the Renewable Assets Reorganization process approved by the ESM held on December 20, 2017, Enel Chile S.A. states the following: i. In compliance with article 212 of Law No. 18,045 of the Securities Market, Enel Chile, on March 25, 2018, published in the newspapers "El Mercurio de Santiago" and "La Tercera" the corresponding notice of result for the Enel Generación Tender Offer declaring successful the aforementioned tender offer, according to its terms and conditions. Pursuant to the Enel Generación Tender Offer, Enel Chile acquired 2,753,096,167 shares of Enel Generación Chile (including those shares represented by the American Depositary Shares ("ADS"), by virtue of a public tender offer of carried out in Chile and the United States of America), equivalent to 33.6% of the shares issued by Enel Generación Chile. In this way, Enel Chile became the owner of a total of 7,672,584,961 shares issued by Enel Generación Chile (including those shares represented by the acquired ADSs). Consequently, the ownerships percentage held by Enel Chile corresponds to 93.55% of the outstanding capital of Enel Generación Chile. Therefore, Enel Chile declared successful each and every one of the conditions and steps that make up the corporate reorganization approved by the ESM, for which it declared the resolution condition of the capital increase of Enel Chile approved at the ESM to be unsuccessful. Thus, each of the steps that make up the Renewable Asset Reorganization will have its effects on the dates that, for each step, are indicated below: a) Merger: The merger by incorporation of EGPL with Enel Chile (the "Merger"), will take effect on April 2, 2018, that is, the first business day of the month following the date on which Enel Chile has published the Notice of Result provided by article 212 of the Securities Market Law, declaring the Enel Generación Chile Tender Offer successful. On that date, Enel Chile will acquire all the assets and liabilities of EGPL and will succeed it in all its rights and obligations, combining in Enel Chile all the shareholders and equity of EGPL, which, as a consequence of the above, it will be dissolved as of right, without the need for its liquidation. b) Capital Increase of Enel Chile: The resolution condition applicable to the capital increase of Enel Chile approved at the ESM for, among other purposes, having sufficient shares to be delivered on the occasion of the Enel Generación Chile Tender Offer is declared unsuccessful. By virtue of the foregoing, as of April 2, 2018, the shareholders or third parties that exercised their pre-emptive subscription rights during the period pre-emptive rights offer ended on March 16, 2018, may subscribe for corresponding shares and proceed to the payment of the shares subscribed by them. c) Enel Generation Chile Tender Offer: In accordance with article 212 of Law No. 18,045 of the Securities Market, the date of acceptance of the Enel Generacion Chile Tender Offer by the shareholders of said company and of the closing of the sale of shares sold under the Enel Generación Chile Tender Offer was made on the date of publication of the Notice of Result. Notwithstanding the foregoing, the payment of the consideration of the Enel Generación Chile Tender Offer and subscription of shares of Enel Chile, will be made on April 2, 2018, in accordance with the terms and conditions described in the Enel Generación Chile Tender Offer prospectus. d) Modification of Bylaws of Enel Generación Chile: The modification of the bylaws of Enel Generación Chile approved by an extraordinary shareholders' meeting of said company held on December 20, 2017, became effective on March 25, 2018, the date on which the Notice of Result required by the article 212 of the Securities Market Law declaring the Enel Generation Chile Tender Offer successful was published. i. Finally, and in accordance with Ordinary Letter No. 32,435 issued by the CMF, dated November 7, 2017, the price of the shares of Enel Chile shareholders who exercised their statutory right to withdraw from Enel Chile as a consequence of the approval of the Merger will be paid by Enel Chile from the date on which the Merger takes effect in accordance with the terms and conditions agreed upon at the EMS, that is, on April 2, 2018 with its corresponding readjustments and interests. 5. On March 28, 2018, lenders, in favor of Enel Chile SA, had disbursed the amounts of ThCh$517,680,625,000 and ThUS$697,500,000 on March 27 and 28, 2018, respectively, pursuant to a "Senior Unsecured Term Loan Credit Agreement", for the purpose of financing the cash consideration for the Renewable Assets Reorganization. 6. On April 2, 2018, the following became effective and the Renewable Assets Reorganization was completed: a) The Merger became effective. b) Enel Chile shareholders and third parties who exercised their pre-emptive subscription rights may subscribe for and pay for the Enel Chile shares subscribed for. c) The payment of the consideration of the Enel Generación Chile Tender Offer, including the delivery of the Enel Chile shares subscribed for as a condition to the Enel Generación Tender Offer, was made. d) The payment of the statutory price payable to Enel Chile shareholders who exercised their statutory merger dissenters’ withdrawal rights commenced. There have been no other subsequent events between January 1, 2018 and the issuance date of these financial statements.

Appendix 1 Enel Chile Group Sub

Appendix 1 Enel Chile Group Subsidiaries	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Subsidiaries [Abstract]
Appendix 1 Enel Chile Group Subsidiaries	APPENDIX 1 ENEL CHILE GROUP SUBSIDIARIES: This appendix is part of Note 2.4, “Subsidiaries”. It discloses the Group’s percentage of control in each company. Percentage of control at 12/31/2017 Percentage of control at 12/31/2016 Taxpayer ID No. Company Currency Direct Indirect Total Direct Indirect Total Type of Relationship Country Activity 76.003.204-2 Central Eólica Canela S.A. Chilean peso - - - — 75.00 % 75.00 % Subsidiary Chile Promotion and development of renewable energy projects 96.800.570-7 Enel Distribución Chile S.A. Chilean peso 99.09 % - 99.09 % 99.08 % 0.01 % 99.09 % Subsidiary Chile Ownership interest in companies of any nature 96.783.910-8 Empresa Eléctrica de Colina Ltda. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Complete energy cycle and related supplies 96.504.980-0 Empresa Eléctrica Pehuenche S.A. Chilean peso - 92.65 % 92.65 % — 92.65 % 92.65 % Subsidiary Chile Complete electric energy cycle 91.081.000-6 Enel Generación Chile S.A. Chilean peso 59.98 % - 59.98 % 59.98 % — 59.98 % Subsidiary Chile Complete electric energy cycle 78.932.860-9 GasAtacama Chile S.A. (1) Chilean peso 2.63 % 97.37 % 100.00 % 2.63 % 97.37 % 100.00 % Subsidiary Chile Company management 78.952.420-3 Gasoducto Atacama Argentina S.A. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Natural gas exploitation and transportation 76.107.186-6 Servicios Informáticos e Inmobiliarios Ltda. Chilean peso - - - 99.00 % 1.00 % 100.00 % Subsidiary Chile Information Technology services 96.800.460-3 Luz Andes Ltda. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Energy and fuel transportation, distribution and sales 76.722.488-5 Empresa de Transmisión Chena S.A Chilean peso - 100.00 % 100.00 % — — — Subsidiary Chile Energy distribution 77.047.280-6 Sociedad Agrícola de Cameros Ltda. Chilean peso 57.50 % - 57.50 % — 57.50 % 57.50 % Subsidiary Chile Financial investments (1) On November 1, 2016, Compañia Eléctrica Tarapacá was merged in and with GasAtacama Chile S.A., being the latter the surviving company.

Appendix 2 Changes in the Scope

Appendix 2 Changes in the Scope of Consolidation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Scope Of Consolidation [Abstract]
Appendix 2 Changes in the Scope of Consolidation	APPENDIX 2 CHANGES IN THE SCOPE OF CONSOLIDATION: This appendix is part of Note 2.4.1 “Changes in the scope of consolidation”. The companies incorporated into the scope of consolidation, are as follows: Percentage of control at 12/31/2017 Percentage of control at 12/31/2016 Company Direct Indirect Total Direct Indirect Total Empresa de Trasmisión Chena S.A. — 100.00 % 100.00 % — — — Companies eliminated from the scope of consolidation: December 31, 2017 December 31, 2016 Ownership Interest Ownership Interest Company Direct Indirect Total Consolidation Method Direct Indirect Total Consolidation Method Gasoducto TalTal S.A. - - - Full integration — 100.00% 100.00% Full integration GNL Norte S.A. - - - Full integration — 100.00% 100.00% Full integration Progas S.A. - - - Full integration — 100.00% 100.00% Full integration GNL Quintero S.A. - - - Equity method — 20.00% 20.00% Equity method Compañía Eléctrica Tarapacá S.A. - - - Full integration 3.78 % 96.21% 99.99% Full integration Inversiones GasAtacama Holding Ltda. - - - Full integration — 100.00% 100.00% Full integration GasAtacama S.A. - - - Full integration — 100.00% 100.00% Full integration Electrogas (1) - 42.50% 42.50% Equity method — — — Equity method Servicios Informáticos e Inmobiliarios Ltda. (2) 99.90 % 0.10% 100.00% Full integration — — — Full integration Central Eólica Canela S.A. (3) - 75.00% 75.00% Full integration — — — Full integration (1) See note 5. (2) On September 1, 2017, this Company entity was merged with by Enel Chile, with the latter being the legal surviving entity. (3) On December 22, 2017, this entity was liquidated and Company was wound up with its assets being were transferred to Gasatacama Chile.

Appendix 3 Associates and Joint

Appendix 3 Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Associates And Joint Ventures [Abstract]
Appendix 3 Associates and Joint Ventures	APPENDIX 3 ASSOCIATES AND JOINT VENTURES: This appendix is part of Note 3.i, “Investments accounted for using the Equity Method”. Ownership Interest at 12/31/2017 Ownership Interest at 12/31/2016 Taxpayer ID No. Company Currency Direct Indirect Total Direct Indirect Total Type of Relationship Country Activity 96.806.130-5 Electrogas S.A. (1) U.S. dollar — — — — 42.50% 42.50% Associate Chile Portfolio company 76.418.940-K GNL Chile S.A. U.S. dollar — 33.33% 33.33% — 33.33% 33.33% Associate Chile Promotion of liquefied natural gas supply project 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 76.041.891-9 Aysén Transmisión S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 76.091.595-5 Aysén Energía S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chilean peso — 50.00% 50.00% — 50.00% 50.00% Joint venture Chile Electric energy transportation and distribution (1) See Note 5.

Appendix 4 Additional Informati

Appendix 4 Additional Information on Financial Debt	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Liabilities [Line Items]
Other Financial Liabilities	18. OTHER FINANCIAL LIABILITIES. The balances of other financial liabilities as of December 31, 2017 and 2016, are as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Other financial liabilities ThCh$ ThCh$ ThCh$ ThCh$ Interest –bearing borrowings 17,255,692 760,932,929 18,013,114 802,046,968 Hedging derivatives (*) 304,278 21,045,216 313,571 48,981,953 Non-hedging derivatives (**) 1,255,478 — 7,369,481 2,987,830 Total 18,815,448 781,978,145 25,696,166 854,016,751 (*) See Note 20.2.a (**) See Note 20.2.b 18.1 Interest-bearing borrowings The detail of current and non-current interest-bearing borrowings as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Classes of Interest-bearing borrowings ThCh$ ThCh$ ThCh$ ThCh$ Bank loans 122 — 4,274 — Unsecured obligations 15,455,782 748,123,803 16,168,473 786,137,688 Financial leases 1,799,788 12,809,126 1,840,367 15,909,280 Total 17,255,692 760,932,929 18,013,114 802,046,968 Bank loans by currency and contractual maturity as of December 31, 2017 and 2016, are as follows: Summary of bank loans by currency and maturity Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 122 — 122 — — — — — — Total 122 — 122 — — — — — — Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 4,274 — 4,274 — — — — — — Total 4,274 — 4,274 — — — — — — Fair value measurement and hierarchy The fair value of current and non-current bank borrowings as of December 31, 2017 and 2016 totaled ThCh$122 and ThCh$4.274, respectively . The fair value measurement of borrowings has been categorized as Level 2 (see Note 3.h). Identification of bank borrowings by company Appendix No.4, letter a), presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the bank loans detailed above. December 31, 2017 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 2,037 — 2,037 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 2,135 — 2,135 — — — — — — Total 4,274 — 4,274 — — — — — — 18.2 Unsecured liabilities The detail of Unsecured Liabilities by currency and maturity as of December 31, 2017 and 2016, is as follows: Summary of unsecured liabilities by currency and maturity Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,322,081 2,206,269 8,528,350 — — — — 430,228,859 430,228,859 Chile U.F. 6.00% 5.48% Unsecured — 6,927,432 6,927,432 5,574,013 5,574,013 5,574,013 5,574,013 295,598,892 317,894,944 Total 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2015 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,884,819 2,402,653 9,287,472 — — — — 468,578,474 468,578,474 Chile U.F. 6.00% 5.48% Unsecured — 6,881,001 6,881,001 5,480,380 5,480,380 5,480,380 5,480,380 295,637,694 317,559,214 Total 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688 Identification of unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,152,926 — 4,152,926 — — — — 125,566,611 125,566,611 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,328,023 — 1,328,023 — — — — 42,902,198 42,902,198 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 841,132 — 841,132 — — — — 19,398,499 19,398,499 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,206,269 2,206,269 — — — — 242,361,551 242,361,551 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,374,051 6,374,051 5,574,013 5,574,013 5,574,013 5,574,013 30,872,536 53,168,588 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% No — 553,381 553,381 — — — — 264,726,356 264,726,356 Total Unsecured Bonds 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 December 31, 2016 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,522,585 — 4,522,585 — — — — 136,759,395 136,759,395 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,446,232 — 1,446,232 — — — — 46,792,429 46,792,429 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 916,002 — 916,002 — — — — 21,608,757 21,608,757 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,402,653 2,402,653 — — — — 263,417,893 263,417,893 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,337,021 6,337,021 5,480,380 5,480,380 5,480,380 5,480,380 35,587,764 57,509,284 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M (*) Chile U.F. 4.82% 4.75% No — 543,980 543,980 — — — — 260,049,930 260,049,930 Total Unsecured Bonds 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688 18.3 Secured liabilities As of December 31, 2017 and 2016, there were no secured liabilities. Fair value measurement and hierarchy The fair value of current and non-current unsecured liabilities as of December 31, 2017 and 2016 totaled ThCh$947,565,989 and ThCh$998,383,047, respectively. The fair value measurement of these liabilities has been categorized as Level 2 (See Note 3.h). It is important to note that these financial assets are measured at amortized cost (See Note 3.g.4). 18.4 Appendix No. 4 letter c) presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the finance lease obligations detailed above. December 31, 2017 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 Total Leasing 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 December 31, 2016 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 Total Leasing 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 18.5 Hedged debt The U.S. dollar denominated debt of the Group as of December 31, 2017 and 2016, that is designated as cash flow hedge to hedge the portion of revenue from its consolidated entities that is directly linked to variations in the U.S. dollar, as referenced in Note 3.m, was ThCh$440,823,086 and ThCh$480,061,539, respectively. The following table details changes in “Reserve for cash flow hedges” as of December 31, 2017, 2016 and 2015, due to exchange differences of this debt: For the years ended December 31, 2017 2016 2015 ThCh$ ThCh$ ThCh$ Balance in hedging reserves (hedging income) at the beginning of the period, net (52,747,646 ) (74,953,393 ) (39,805,098 ) Foreign currency exchange differences recognized in equity, net 17,321,594 14,317,257 (38,579,730 ) Foreign currency exchange differences recognized in profit and loss, net 8,258,044 7,888,490 3,431,435 Balance in hedging reserves (hedging income) at the end of the period, net (27,168,008 ) (52,747,646 ) (74,953,393 ) 18.6 Other information As of December 31, 2017 and 2016, the Group has undrawn line of credits available for use amounting to ThCh$199,271,103 and ThCh$342,827,047, respectively.
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Other Financial Liabilities	APPENDIX 4 ADDITIONAL INFORMATION ON FINANCIAL DEBT: This appendix is part of Note 18, “Other financial liabilities.” The following tables present the contractual undiscounted cash flows by type of financial debt: a) Bank borrowings 1. Summary of bank borrowings by currency and maturity Current Non-current Current Non-current Maturity Maturity Maturity Maturity Country Currency Nominal Interest Rate One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years More than five years Total Non- Current 12/31/2017 One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non- Current 12/31/2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 122 — 122 — — — — — — 4,283 — 4,283 — — — — — — Total 122 — 122 — — — — — — 4,283 — 4,283 — — — — — — 2. Identification of bank borrowings by company December 31, 2017 Current Non-current Taxpayer ID No. Company Country Financial Institution Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile Banco de Crédito e Inversiones Ch$ 6.00% 6.00% 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco de Crédito e Inversiones US$ 6.00% 6.00% 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander Ch$ 6.00% 6.00% 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID No. Company Country Financial Institution Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile Banco de Crédito e Inversiones Ch$ 6.00% 6.00% 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco de Crédito e Inversiones US$ 6.00% 6.00% 2,048 — 2,048 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander Ch$ 6.00% 6.00% 2,133 — 2,133 — — — — — — Total 4,283 — 4,283 — — — — — — b) Secured and unsecured liabilities 1. Summary of secured and unsecured liabilities by currency and maturity Current Non-current Current Non-current Maturity Maturity Maturity Maturity Country Currency Nominal Interest Rate One to three months Three to twelve months Total Current at 12/31/2017 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current at 12/31/2017 One to three months Three to twelve months Total Current at 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current at 12/31/2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.90% 6,697,979 20,093,935 26,791,914 26,791,913 26,791,913 26,791,913 26,791,913 568,727,913 675,895,565 7,264,786 21,794,359 29,059,145 29,059,146 29,059,146 29,059,146 29,059,146 641,348,382 757,584,966 Chile U.F. 5.48% 5,775,038 22,689,438 28,464,476 51,927,014 49,837,566 47,748,117 45,658,669 256,892,562 452,063,928 6,466,160 24,665,200 31,131,360 30,632,431 53,611,843 51,316,337 49,020,830 305,390,728 489,972,169 Total 12,473,017 42,783,373 55,256,390 78,718,927 76,629,479 74,540,030 72,450,582 825,620,475 1,127,959,493 13,730,946 46,459,559 60,190,505 59,691,577 82,670,989 80,375,483 78,079,976 946,739,110 1,247,557,135 2. Secured and unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID No. Company Country Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-1 U.S.A. US$ 7.96% 7.88% 2,612,406 7,837,217 10,449,623 10,449,623 10,449,623 10,449,623 10,449,623 170,108,928 211,907,420 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-2 U.S.A. US$ 7.40% 7.33% 833,743 2,501,229 3,334,972 3,334,972 3,334,972 3,334,972 3,334,972 86,312,007 99,651,895 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-3 U.S.A. US$ 8.26% 8.13% 530,161 1,590,483 2,120,644 2,120,644 2,120,644 2,120,644 2,120,644 51,884,633 60,367,209 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Unica 24296 U.S.A. US$ 4.32% 4.25% 2,721,669 8,165,006 10,886,675 10,886,674 10,886,674 10,886,674 10,886,674 260,422,345 303,969,041 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% 1,414,018 9,606,378 11,020,396 10,516,773 10,013,150 9,509,527 9,005,904 44,726,323 83,771,677 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% 4,361,020 13,083,060 17,444,080 41,410,241 39,824,416 38,238,590 36,652,765 212,166,239 368,292,251 Total 12,473,017 42,783,373 55,256,390 78,718,927 76,629,479 74,540,030 72,450,582 825,620,475 1,127,959,493 December 31, 2016 Current Non-Current Taxpayer ID No. Company Country Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-1 U.S.A. US$ 7.96% 7.88% 2,832,647 8,497,942 11,330,589 11,330,590 11,330,590 11,330,590 11,330,590 196,227,387 241,549,747 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera EmisiónS-2 U.S.A. US$ 7.40% 7.33% 903,234 2,709,703 3,612,937 3,612,937 3,612,937 3,612,937 3,612,937 93,701,216 108,152,964 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-3 U.S.A. US$ 8.26% 8.13% 574,765 1,724,294 2,299,059 2,299,059 2,299,059 2,299,059 2,299,059 56,341,806 65,538,042 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Única 24296 U.S.A. US$ 4.32% 4.25% 2,954,140 8,862,420 11,816,560 11,816,560 11,816,560 11,816,560 11,816,560 295,077,973 342,344,213 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% 1,525,571 9,843,433 11,369,004 10,870,075 10,371,146 9,872,218 9,373,289 52,887,199 93,373,927 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% 4,940,589 14,821,767 19,762,356 19,762,356 43,240,697 41,444,119 39,647,541 252,503,529 396,598,242 Total 13,730,946 46,459,559 60,190,505 59,691,577 82,670,989 80,375,483 78,079,976 946,739,110 1,247,557,135 c) Financial lease obligations 1. Financial lease obligations by company December 31, 2017 Current Non-Current Taxpayer ID No. Company Country Taxpayer ID No. Financial Institution Country Currency Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.556.400-4 Transelec S.A. Chile US$ 6.50% 685,232 2,052,448 2,737,680 2,728,693 2,719,123 2,708,931 2,698,076 4,473,883 15,328,706 Total 685,232 2,052,448 2,737,680 2,728,693 2,719,123 2,708,931 2,698,076 4,473,883 15,328,706 December 31, 2016 Current Non-Current Taxpayer ID No. Company Country Taxpayer ID No. Financial Institution Country Currency Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.556.400-4 Transelec S.A. Chile US$ 6.50% 734,006 2,200,827 2,934,833 2,931,533 2,928,019 2,924,276 2,920,289 7,777,314 19,481,431 Total 734,006 2,200,827 2,934,833 2,931,533 2,928,019 2,924,276 2,920,289 7,777,314 19,481,431

Appendix 5 Details of Assets an

Appendix 5 Details of Assets and Liabilities in Foreign Currency	12 Months Ended
	Dec. 31, 2017
Text Block1 [Abstract]
Appendix 5 Details of Assets and Liabilities in Foreign Currency	APPENDIX 5 DETAILS OF ASSETS AND LIABILITIES IN FOREIGN CURRENCY: This appendix forms an integral part of the Group’s consolidated financial statements. The detail of assets and liabilities denominated in foreign currencies is the following: 12-31-2017 12-31-2016 ASSETS Foreign Currency ThCh$ ThCh$ Cash and cash equivalents 419,456,026 245,999,192 U.S. dollar 14,016,336 5,198,139 Euros 11,594 — Argentine peso 6,263,345 4,807,406 Chilean peso non-adjustable 399,164,751 235,993,647 Other current financial assets 20,627,062 584,244 U.S. dollar 20,441,150 422,705 Chilean peso non-adjustable 185,912 132,468 U.F. — 29,071 Other current non- financial assets 6,002,142 15,831,486 U.S. dollar 902,026 65,138 Argentine peso 32,621 57,145 Chilean peso non-adjustable 5,067,495 15,709,203 Trade and other current receivables 419,752,286 445,071,856 U.S. dollar 5,273,104 — Argentine peso 1,073,072 931,882 Chilean peso non-adjustable 412,267,621 443,032,735 U.F. 1,138,489 1,107,239 Current accounts receivable from related companies 71,856,046 52,858,384 U.S. dollar 22,793,820 16,780,275 Euros 42,663,049 424,692 Real 36,276 Colombian peso 1,627,495 Soles 15,192 Chilean peso non-adjustable 6,399,177 33,974,454 Inventories 39,686,942 37,539,596 Chilean peso non-adjustable 39,686,942 37,539,596 Current tax assets 77,756,048 55,649,171 Argentine peso 146,525 302,528 Chilean peso non-adjustable 77,609,523 55,346,643 Non- current assets or disposal group held for sale — 12,993,008 Chilean peso non-adjustable — 12,993,008 Non- current assets or disposal group held for distribution to owners 4,205,233 — Chilean peso non-adjustable 4,205,233 — TOTAL CURRENT ASSETS 1,059,341,785 866,526,937 NON-CURRENT ASSETS Foreign Currency 12-31-2017 12-31-2016 Other non-current financial assets 33,418,204 28,827,542 U.S. dollar 30,789,705 26,185,923 Chilean peso non-adjustable 2,628,499 2,641,619 Other non-current non-financial assets 13,813,139 13,336,152 U.S. dollar 322,744 - Argentine peso 378,940 303,837 Chilean peso non-adjustable 12,326,385 12,241,662 U.F. 785,070 790,653 Trade and other non-current receivables 36,182,399 33,500,105 Argentine peso 62,563 27,567 Chilean peso non-adjustable 25,228,146 21,948,173 U.F. 10,891,690 11,524,365 Investments accounted for using the equity method 12,707,221 18,738,198 U.S. dollar 3,783,316 3,982,934 Argentine peso 105,151 91,335 Chilean peso non-adjustable 8,818,754 14,663,929 Intangible assets other than goodwill 55,170,904 44,470,750 Argentine peso 253,849 194,529 Chilean peso non-adjustable 54,917,055 44,276,221 Goodwill 887,257,655 887,257,655 Chilean peso non-adjustable 887,257,655 887,257,655 Property, plant and equipment 3,585,687,137 3,476,128,634 Argentine peso 15,450,783 16,039,114 Chilean peso non-adjustable 3,570,236,354 3,460,089,520 Investment property 8,356,772 8,128,522 Chilean peso non-adjustable 8,356,772 8,128,522 Deferred tax assets 2,837,792 21,796,517 Chilean peso non-adjustable 2,837,792 21,796,517 TOTAL NON-CURRENT ASSETS 4,635,431,223 4,532,184,075 TOTAL ASSETS 5,694,773,008 5,398,711,012 12-31-2017 12-31-2016 LIABILITIES Less than 90 days More than 90 days Less than 90 days More than 90 days Foreign Currency ThCh$ ThCh$ ThCh$ ThCh$ Other Current financial liabilities 7,999,866 10,815,582 15,021,428 10,674,738 U.S. dollar 7,999,743 3,888,150 15,017,154 3,793,737 Chilean peso non-adjustable 123 — 4,274 — U.F. — 6,927,432 — 6,881,001 Trade and other current payables 590,848,682 3,649,924 561,505,283 — U.S. dollar 16,184,962 — 9,463,287 — Euros 3,174,586 — 1,384,882 — Argentine peso 732,777 — 970,255 — Chilean peso non-adjustable 570,756,357 3,649,924 549,686,859 — Current accounts payable to related parties 119,538,232 — 90,428,929 — U.S. dollar 9,090,837 — 4,936,256 — Euros 28,830,246 — 841,934 — Colombian peso 12,487 — 5,461 — Soles 2,110 — 2,239 — Chilean peso non-adjustable 81,602,552 — 84,643,039 — Other current provisions 384,955 5,251,216 6,493,532 — Argentine peso 45,419 — 20,859 — Chilean peso non-adjustable 339,536 5,251,216 6,472,673 — Current tax liabilities 904,248 66,123,259 7,966,008 53,633,407 Argentine peso 146,769 — — — Chilean peso non-adjustable 757,479 66,123,259 7,966,008 53,633,407 Other current non-financial liabilities — 11,225,942 23,330 11,499,992 Chilean peso non-adjustable — 11,225,942 23,330 11,499,992 12-31-2017 12-31-2016 LIABILITIES Foreign Currency One to five years More than five years One to five years More than five years ThCh$ ThCh$ ThCh$ ThCh$ Other non-current financial liabilities 51,932,458 730,045,687 83,294,443 770,722,308 U.S. dollar 29,636,407 434,446,795 61,372,923 475,084,614 U.F. 22,296,051 295,598,892 21,921,520 295,637,694 Trade and other non-current payables 659,824 - 1,483,113 - U.S. dollar 947 - - - Euro - - 29,952 - Argentine peso 173,343 - 887,668 - Chilean peso non-adjustable 485,534 - 565,493 - Current account payable to related parties 318,518 - 251,527 - Euros 318,518 - - - Chilean peso non-adjustable - - 251,527 - Other long-term provisions 52,318 78,370,519 17,912,846 45,194,062 Chilean peso non-adjustable 52,318 78,370,519 17,912,846 45,194,062 Deferred tax liabilities 55,844,982 116,378,699 66,412,315 132,952,479 Argentine peso 4,459,081 - 3,751,112 - Chilean peso non-adjustable 51,385,901 116,378,699 62,661,203 132,952,479 Non- current provisions for employee benefits 3,434,185 53,647,739 3,683,376 56,250,751 Chilean peso non-adjustable 3,434,185 53,647,739 3,683,376 56,250,751 Other non-current non financial liabilities 309,776 - 313,503 - Chilean peso non-adjustable 309,776 - 313,503 - TOTAL NON-CURRENT LIABILITIES 112,552,061 978,442,644 173,351,123 1,005,119,600 TOTAL LIABILITIES 832,302,784 1,075,508,567 854,789,633 1,080,927,737

Appendix 6 Additional Informati

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012	12 Months Ended
	Dec. 31, 2017
Trade And Other Receivables [Abstract]
Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012	APPENDIX 6 ADDITIONAL INFORMATION OFICIO CIRCULAR This appendix forms an integral part of the Group’s consolidated financial statements. a) Portfolio stratification • Trade and other receivables by aging: As of December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Total Non-Current Trade and Other Receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, gross 291,417,828 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 54,604,283 415,039,522 1,917,828 Allowance for doubtful accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (32,270,098 ) (34,660,196 ) — Other receivables, gross 39,372,960 — — — — — — — — 9,213,863 48,586,823 34,264,571 Allowance for doubtful accounts — — — — — — — — — (9,213,863 ) (9,213,863 ) — Total 330,701,026 33,399,262 17,293,165 3,796,047 1,965,584 4,388,548 2,654,063 1,556,493 1,663,913 22,334,185 419,752,286 36,182,399 As of December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Total Non-Current Trade and Other Receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, gross 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 63,349,580 414,184,116 8,369,878 Allowance for doubtful accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (29,672,710 ) (31,696,816 ) — Other receivables, gross 62,584,556 — — — — — — — — 7,765,064 70,349,620 25,130,227 Allowance for doubtful accounts — — — — — — — — — (7,765,064 ) (7,765,064 ) — Total 342,836,256 33,897,290 14,268,110 4,094,395 2,155,961 5,872,964 2,766,214 1,360,066 4,143,730 33,676,870 445,071,856 33,500,105 • By type of portfolio: December 31, 2017 December 31, 2016 Non-renegotiated Portfolio Renegotiated Portfolio Total Gross Portfolio Non-renegotiated Portfolio Renegotiated Portfolio Total Gross Portfolio Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Aging of balances ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Current 1,145,472 288,681,858 52,679 4,653,798 1,198,151 293,335,656 1,157,940 281,705,071 60,278 5,850,339 1,218,218 287,555,410 1 to 30 days 451,929 30,202,328 22,869 3,428,065 474,798 33,630,393 414,617 30,167,962 22,459 3,951,138 437,076 34,119,100 31 to 60 days 133,114 15,573,493 8,780 1,933,127 141,894 17,506,620 107,539 12,724,070 8,312 1,756,446 115,851 14,480,516 61 to 90 days 22,305 3,228,258 2,795 767,886 25,100 3,996,144 18,344 3,813,933 2,128 448,919 20,472 4,262,852 91 to 120 days 9,505 1,817,086 1,422 372,319 10,927 2,189,405 8,987 1,978,892 1,049 286,640 10,036 2,265,532 121 to 150 days 7,118 4,216,619 1,093 348,718 8,211 4,565,337 5,866 5,753,020 656 230,854 6,522 5,983,874 151 to 180 days 5,333 2,526,954 699 334,627 6,032 2,861,581 4,671 2,415,755 442 525,184 5,113 2,940,939 181 to 210 days 10,103 2,127,005 446 343,968 10,549 2,470,973 20,001 2,016,444 275 109,839 20,276 2,126,283 211 to 250 days 3,979 1,599,571 394 197,387 4,373 1,796,958 3,535 4,163,062 217 83,669 3,752 4,246,731 More than 251 days 125,590 48,307,224 5,593 6,297,059 131,183 54,604,283 123,301 60,447,048 3,613 4,125,709 126,914 64,572,757 Total 1,914,448 398,280,396 96,770 18,676,954 2,011,218 416,957,350 1,864,801 405,185,257 99,429 17,368,737 1,964,230 422,553,994 b) Portfolio in default and in legal collection process As of December 31, 2017 2016 Number of Amount Number of Amount Portfolio in Default and in Legal Collection Process Customers ThCh$ Customers ThCh$ Notes receivable in default 1,902 259,560 1,949 262,912 Notes receivable in legal collection process (*) 2,744 6,041,670 3,608 7,049,869 Total 4,646 6,301,230 5,557 7,312,781 (*) Legal collections are included in the portfolio in arrears. c) Provisions and write-offs As of December 31, 2017 2016 Provisions and Write-offs ThCh$ ThCh$ Provision for non-renegotiated portfolio 7,928,877 4,919,244 Provision for renegotiated portfolio 8,940 (746,953 ) Total 7,937,817 4,172,291 d) Number and value of operations December 31, 2017 December 31, 2016 Total detail by type of operation Total detail by type of operation Total detail by type of operation Total detail by type of operation Number and Value of Operations Last Quarter Year-to-date Last Quarter Year-to-date Impairment provisions and recoveries: Number of operations 5,376 46,484 11,092 1,949,771 Value of operations, in ThCh$ 4,058,212 7,937,817 74,563 4,172,291 APPENDIX 6.1 SUPPLEMENTARY INFORMATION ON TRADE RECEIVABLES: This appendix forms an integral part of the Group’s consolidated financial statements. a) Portfolio stratification • Trade receivables by aging: December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days More than 365 days Total Current Total Non- Current Trade and other current receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, generation 186,769,753 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 195,570,350 62,563 - Large customers 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 195,525,065 - - Institutional customers - — — — — - - - - - - - - - Others 45,285 — — — — - - - - - - 45,285 62,563 Allowance for doubtful accounts - — — — — - - - - (1,103,086 ) (155,731 ) (1,258,817 ) - Unbilled services 138,781,170 — — — — — — — — — — 138,781,170 — Services billed 47,988,583 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 56,789,180 62,563 Trade receivables, distribution 104,648,075 30,572,399 17,173,541 3,717,044 2,179,384 4,523,322 2,527,283 2,071,421 1,568,460 4,286,717 46,201,526 219,469,172 1,855,265 - Mass-market customers 84,591,816 22,148,005 10,699,951 2,264,627 1,657,978 1,231,644 918,357 1,700,605 567,152 1,808,646 25,341,852 152,930,633 1,781,421 - Large customers 17,771,942 6,565,888 4,987,871 940,754 168,838 1,809,919 357,379 30,481 7,237 1,295,122 12,333,224 46,268,655 — - Institutional customers 2,284,317 1,858,506 1,485,719 511,663 352,568 1,481,759 1,251,547 340,335 994,071 1,182,949 8,526,450 20,269,884 73,844 Allowance for doubtful accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (877,621 ) (30,133,660 ) (33,401,379 ) — Unbilled services 77,733,438 — — — — — — — — — — 77,733,438 — Services billed 26,914,637 30,572,399 17,173,541 3,717,044 2,179,384 4,523,322 2,527,283 2,071,421 1,568,460 4,286,717 46,201,526 141,735,734 1,855,265 Total Trade Receivables, Gross 291,417,828 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 5,883,693 48,720,590 415,039,522 1,917,828 Total Allowance for Doubtful Accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (1,980,707 ) (30,289,391 ) (34,660,196 ) — Total Trade Receivables, Net 291,328,066 33,399,262 17,293,165 3,796,047 1,965,584 4,388,548 2,654,063 1,556,493 1,663,913 3,902,986 18,431,199 380,379,326 1,917,828 December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days More than 365 days Total Current Total Non- Current Trade and other current receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, generation 179,498,353 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 214,479,116 5,751,509 - Large customers 179,482,501 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 214,463,264 5,723,942 - Institutional customers — — — — — — — — — — — — — - Others 15,852 — — — — — — — — — — 15,852 27,567 Allowance for doubtful accounts — — — — — — — — — (1,314,310 ) — (1,314,310 ) — Unbilled services 125,367,509 — — — — — — — — — — 125,367,509 3,308,454 Services billed 54,130,844 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 89,111,607 2,443,055 Trade receivables, distribution 100,910,356 31,348,518 13,315,339 3,489,350 1,365,439 882,757 2,927,330 1,572,297 652,998 2,667,650 40,572,966 199,705,000 2,618,369 - Mass-market customers 74,735,718 23,318,881 9,558,288 1,981,025 862,071 615,659 534,796 779,941 347,398 1,202,738 23,490,230 137,426,745 2,164,930 - Large customers 23,586,354 6,566,919 2,148,243 1,231,708 209,825 172,851 1,174,012 46,128 2,424 766,851 10,154,924 46,060,239 34,602 - Institutional customers 2,588,284 1,462,718 1,608,808 276,617 293,543 94,247 1,218,522 746,228 303,176 698,061 6,927,812 16,218,016 418,837 Allowance for doubtful accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (614,954 ) (27,743,446 ) (30,382,506 ) — Unbilled services 61,742,593 — — — — — — — — — — 61,742,593 149,508 Services billed 39,167,763 31,348,518 13,315,339 3,489,350 1,365,439 882,757 2,927,330 1,572,297 652,998 2,667,650 40,572,966 137,962,407 2,465,400 Total Trade Receivables, Gross 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 12,267,918 51,081,662 414,184,116 8,369,878 Total Allowance for Doubtful Accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (1,929,264 ) (27,743,446 ) (31,696,816 ) — Total Trade Receivables, Net 280,251,700 33,897,290 14,268,110 4,094,395 2,155,961 5,872,964 2,766,214 1,360,066 4,143,730 10,338,654 23,338,216 382,487,300 8,369,878 Since not all of our commercial databases in our Group’s subsidiaries distinguish whether the final electricity service consumer is a natural or legal person, the main management segmentation used by all the consolidated entities to monitor and follow up on trade receivables is the following: • Mass-market customers • Large customers • Institutional customers • By type of portfolio: December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Gross Portfolio Total Non-Current Gross Portfolio Type of Portfolio ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GENERATION Non-renegotiated portfolio 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 4,116,040 195,525,065 — - Large customers 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 4,116,040 195,525,065 — - Institutional customers — — — — — — — — — — — — - Others — — — — — — — — — — — — Renegotiated portfolio 45,285 — — — — — — — — — 45,285 62,563 - Large customers — — — — — — — — — — — — - Institutional customers — — — — — — — — — — — — - Others 45,285 — — — — — — — — — 45,285 62,563 DISTRIBUTION Non-renegotiated portfolio 101,580,927 27,144,334 15,240,414 2,949,158 1,807,065 4,174,604 2,192,656 1,727,453 1,371,073 44,191,184 202,378,868 376,463 - Mass-market customers 81,786,896 19,120,060 9,323,291 1,705,992 1,285,659 882,926 671,894 1,554,175 423,730 20,987,147 137,741,770 342,063 - Large customers 17,522,970 6,565,888 4,590,254 940,754 168,838 1,809,919 357,379 30,481 7,237 13,521,914 45,515,634 — - Institutional customers 2,271,061 1,458,386 1,326,869 302,412 352,568 1,481,759 1,163,383 142,797 940,106 9,682,123 19,121,464 34,400 Renegotiated portfolio 3,067,148 3,428,065 1,933,127 767,886 372,319 348,718 334,627 343,968 197,387 6,297,059 17,090,304 1,478,802 - Mass-market customers 2,804,920 3,027,945 1,376,659 558,635 372,319 348,718 246,463 146,430 143,422 6,163,350 15,188,861 1,439,358 - Large Customers 248,972 — 397,617 — — — — — — 106,433 753,022 — - Institutional Customers 13,256 400,120 158,851 209,251 — — 88,164 197,538 53,965 27,276 1,148,421 39,444 Total Gross Portfolio 291,372,543 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 54,604,283 415,039,522 1,917,828 December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Gross Portfolio Total Non-Current Gross Portfolio Type of Portfolio ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GENERATION Non-renegotiated portfolio 179,498,353 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 20,108,963 214,479,115 5,751,509 - Large customers 179,482,501 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 20,108,963 214,463,263 5,723,942 - Institutional customers — — — — — — — — — — — — - Others 15,852 — — — — — — — — — 15,852 27,567 Renegotiated portfolio — — — — — — — — — — — — - Large customers — — — — — — — — — — — — - Institutional customers — — — — — — — — — — — — - Others — — — — — — — — — — — — DISTRIBUTION Non-renegotiated portfolio 96,922,455 27,397,380 11,558,893 3,040,431 1,078,799 651,903 2,402,146 1,462,458 569,329 39,114,907 184,198,701 755,931 - Mass-market customers 71,334,454 20,155,266 8,134,561 1,532,106 575,781 410,789 377,710 670,102 265,574 20,582,480 124,038,823 721,329 - Large customers 23,376,286 6,499,554 2,148,243 1,231,708 209,825 146,867 1,174,012 46,128 2,424 10,921,775 45,756,822 34,602 - Institutional customers 2,211,715 742,560 1,276,089 276,617 293,193 94,247 850,424 746,228 301,331 7,610,652 14,403,056 — Renegotiated portfolio 3,987,901 3,951,138 1,756,446 448,919 286,640 230,854 525,184 109,839 83,669 4,125,709 15,506,299 1,862,438 - Mass-market customers 3,401,264 3,163,614 1,423,727 448,919 286,290 204,870 157,086 109,839 81,824 4,110,488 13,387,921 1,443,601 - Large Customers 210,068 67,366 — — — 25,984 — — — — 303,418 — - Institutional Customers 376,569 720,158 332,719 — 350 — 368,098 — 1,845 15,221 1,814,960 418,837 Total Gross Portfolio 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 63,349,579 414,184,115 8,369,878 APPENDIX 6.2 ESTIMATED SALES AND PURCHASES OF ENERGY AND CAPACITY: This appendix forms an integral part of the Group’s consolidated financial statements. 12-31-2017 12-31-2016 Energy and Tolls Capacity Energy and Tolls Capacity STATEMENT OF FINANCIAL POSITION ThCh$ ThCh$ ThCh$ ThCh$ Current accounts receivable from related companies 5,518,711 466,031 590,636 21,774 Trade and other current receivables 177,886,960 48,122,678 168,833,728 23,276,222 Total Estimated Assets 183,405,671 48,588,709 169,424,364 23,297,996 Current accounts payable to related companies 21,818,299 177,839 13,459,812 191,936 Trade and other current payables 120,451,406 47,893,119 85,425,025 42,571,883 Total Estimated Liabilities 142,269,705 48,070,958 98,884,837 42,763,819 12-31-2017 12-31-2016 12-31-2015 Energy and Tolls Capacity Energy and Tolls Capacity Energy and Tolls Capacity INCOME STATEMENT ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Energy Sales 183,405,671 48,588,709 169,424,364 23,297,996 216,908,877 34,686,488 Energy Purchases 142,269,706 48,070,958 98,884,837 42,763,819 101,922,626 43,935,488

Appendix 7 Details of Due Dates

Appendix 7 Details of Due Dates of Payments to Suppliers	12 Months Ended
	Dec. 31, 2017
Details Of Due Dates Of Payments To Suppliers [Abstract]
Appendix 7 Details of Due Dates of Payments to Suppliers	APPENDIX 7 DETAILS OF DUE DATES OF PAYMENTS TO SUPPLIERS: This appendix forms an integral part of the Group’s consolidated financial statements. December 31, 2017 December 31, 2016 Goods Services Other Total Goods Services Other Total Suppliers with Current Payments ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Up to 30 days — 94,132,902 91,209,336 185,342,238 — 90,386,018 68,377,696 158,763,714 From 31 to 60 days — — — — — — — — From 61 to 90 days — — — — — — — — From 91 to 120 days — — — — — — — — From 121 to 365 days — — — — — — — — More than 365 days — — — — — — — — Total — 94,132,902 91,209,336 185,342,238 — 90,386,018 68,377,696 158,763,714

Accounting Policies Applied (Po

Accounting Policies Applied (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies Applied [Abstract]
Property, plant and equipment	a) Property, plant and equipment Property, plant and equipment are measured at acquisition cost, net of accumulated depreciation and any impairment losses they may have experienced. In addition to the price paid to acquire each item, the cost also includes, where applicable, the following concepts: • Financing expenses accrued during the construction period that are directly attributable to the acquisition, construction, or production of qualified assets, which require a substantial period of time before being ready for use such as, for example, electricity generation or distribution facilities. The Group defines “substantial period” as one that exceeds twelve months. The interest rate used is that of the specific financing or, if none exists, the weighted average financing rate of the company carrying out the investment. (See Note 15.b.1). • Employee expenses directly related to construction in progress. (See Note 15.b.2). • Future disbursements that the Group will have to incur to close its facilities are added to the value of the asset at fair value, recognizing the corresponding provision for dismantling or restoration. The Group reviews its estimate of these future disbursements on an annual basis, increasing or decreasing the value of the asset based on the results of this estimate (See Note 22). Items for construction work in progress are transferred to operating assets once the testing period has been completed and they are available for use, at which time depreciation begins. Expansion, modernization or improvement costs that represent an increase in productivity, capacity or efficiency, or a longer useful life are capitalized as increasing the cost of the corresponding assets. The replacement or overhaul of entire components that increase the asset’s useful life or economic capacity are recorded as an increase in cost for the respective assets, derecognizing the replaced or overhauled components. Expenditures for periodic maintenance, conservation and repair are recognized directly as an expense for the year in which they are incurred. Property, plant and equipment, net of its residual value, is depreciated by distributing the cost of the different items that comprise it on a straight-line basis over its estimated useful life, which is the period during which the Group expects to use the assets. Useful life estimates and residual values are reviewed on an annual basis and if appropriate adjusted prospectively. The following table sets forth the main categories of property, plant and equipment with their respective estimated useful lives: Categories of Property, plant and equipment Years of estimated useful lives Buildings 10 – 60 Plant and equipment 6 – 65 IT equipment 3 – 15 Fixtures and fittings 2 – 35 Motor vehicles 5 – 10 Additionally, the following table sets forth more details on the useful lives of plant and equipment items: Years of estimated useful lives Generating facilities: Hydroelectric plants Civil engineering works 10 – 65 Electromechanical equipment 10 – 45 Fuel oil/coal-fired power plants 25 – 40 Combined cycle power plants 10 – 25 Renewable energy power plants 20 Transmission and distribution facilities: High-voltage network 10 – 60 Low- and medium-voltage network 10 – 50 Measuring and remote control equipment 10 – 50 Primary substations 6 – 25 Natural gas transport facilities Pipelines 20 Land is not depreciated since it has an indefinite useful life. Gains or losses that arise from the sale or disposal of items of Property, plant and equipment are recognized as “Other gains (losses)” in the comprehensive income statement and are calculated by deducting the net carrying amount of the asset and any sales expenses from the amount received in the sale.
Investment property	b) Investment property Investment property includes land and buildings held for earning rentals and/or for capital appreciation. Investment property is measured at acquisition cost less any accumulated depreciation and impairment losses that have been incurred. Investment property, excluding land, is depreciated on a straight-line basis over the useful lives of the related assets. An investment property is derecognized upon disposal or when no future economic benefits are expected from its use or disposal. Gains or losses on recognition of the investment property is calculated as the difference between the net disposal proceeds and the carrying amount of the asset. The breakdown of the fair value of investment property is detailed in Note 16.
Goodwill	c) Goodwill Goodwill arising from business combinations, and reflected upon consolidation, represents the excess value of the consideration paid plus the amount of any non-controlling interests over the Group’s share of the net value of the assets acquired and liabilities assumed, measured at fair value at the acquisition date. If the accounting for a business combination is completed within the following year after the acquisition date, and so is the goodwill determination, the entity recognizes the corresponding adjustments to the provisional amounts as if the accounting for the business combination had been completed at the acquisition date. During the measurement period of the business combination, the goodwill can be adjusted as a result of changes in the recognized provisional amounts of the assets acquired and liabilities assumed (See note 2.7.1). Goodwill arising from acquisition of companies with functional currencies other than the Chilean peso is measured in the functional currency of the acquired company and translated to Chilean pesos using the exchange rate effective as of the date of the statement of financial position. Goodwill is not amortized; instead, at the end of each reporting period or when there are indicators that an impairment might have occurred, the Group estimates whether any impairment loss has reduced its recoverable amount to an amount less than the carrying amount and, if so, an impairment loss is immediately recognized in profit or loss (See Note 3.e).
Intangible assets other than goodwill	d) Intangible assets other than goodwill Intangible assets are initially recognized at their acquisition cost or production cost, and are subsequently measured at their cost, net of their accumulated amortization and impairment losses they may have experienced. Intangible assets are amortized on a straight line basis during their useful lives, starting from the date when they are ready for use, except for those with an indefinite useful life, which are not amortized. As of December 31, 2017 and 2016, there are no significant intangible assets with an indefinite useful life. An intangible asset is derecognized on disposal, or when no future economic benefits are expected from use or disposal. Gains or losses arising from derecognition of an intangible asset, measured as the difference between the net disposal proceeds and the carrying amount of the asset are recognized in profit or loss when the asset is derecognized. The criteria for recognizing these assets’ impairment losses and, if applicable, recovery of impairment losses recorded in previous periods are explained in Note 3.e below. d.1) Research and development expenses The Group recognizes the costs incurred in a project’s development phase as intangible assets in the statement of financial position as long as the project’s technical feasibility and future economic benefits have been demonstrated. Research costs are recorded as an expense in the consolidated statement of comprehensive income in the period in which they are incurred. d.2) Other intangible assets Other intangible assets correspond to computer software, water rights, and easements. They are initially recognized at acquisition or production cost and are subsequently measured at cost less accumulated amortization and impairment losses, if any. Computer software is amortized (on average) over four years. Certain easements and water rights have indefinite useful lives and, therefore, are not amortized.
Impairment of non-financial assets	e) Impairment of non-financial assets During the year, and principally at the end of each reporting period, the Group evaluates whether there is any indication that an asset has been impaired. If any such indication exist, the Group estimates the recoverable amount of that asset to determine the amount of the impairment loss. In the case of identifiable assets that do not generate cash flows independently, the Group estimates the recoverable amount of the Cash Generating Unit (CGU) to which the asset belongs, which is understood to be the smallest identifiable group of assets that generates independent cash inflows. Notwithstanding the preceding paragraph, in the case of CGU’s to which goodwill or intangible assets with indefinite useful lives have been allocated, a recoverability analysis is performed routinely at each period end. Recoverable amount is the higher of fair value less costs of disposal and value in use, which is defined as the present value of the estimated future cash flows. In order to calculate the recoverable amount of Property, plant, and equipment, as well as of goodwill, and intangible assets, the Group uses value in use criteria in practically all cases. To estimate value in use, the Group prepares future pre-tax cash flow projections based on the most recent budgets available. These budgets incorporate management’s best estimates of a CGU’s revenue and costs using sector projections, past experience and future expectations. In general, these projections cover the next five years, estimating cash flows for subsequent years by applying reasonable growth rates which, in no case, are increasing rates nor exceed the average long-term growth rates for the particular sector and country in which the Group operates. As of December 31, 2017, the growth rate used to extrapolate the projections was 3.1%. Future cash flows are discounted to calculate their present value at a pre-tax rate that covers the cost of capital for the business activity and the geographic area in which it is being carried out. The time value of money and risk premiums generally used among analysts for the business activity and the geographic zone are taken into account to calculate the pre-tax rate. The minimum and maximum pre-tax discount rates applied in the period ended December 31, 2017 expressed in nominal terms were 7.5% and 10.7%, respectively. If the recoverable amount of the CGU is estimated to be less than the net carrying amount of the asset, the corresponding impairment loss is recognized for the difference, and charged to “Reversal of impairment loss (impairment loss)” recognized in profit or loss" in the consolidated statement of comprehensive income. The impairment is first allocated to reduce the carrying amount of any goodwill allocated to the CGU, and then to the other assets of the unit pro rata on the basis of the carrying amount of each asset in the unit. The carrying amount of an asset is not reduced below the highest of fair value less costs of disposal, its value in use; or zero. Impairment losses recognized for an asset in prior periods are reversed when there are indications that the impairment loss no longer exists or may have decreased, thus increasing the asset’s carrying amount with a credit to earnings. The increase in the asset’s carrying amount shall not exceed that carrying amount that would have been determined had no impairment loss been recognized for the asset. Goodwill impairment losses are not reversed in subsequent periods.
Leases	f) Leases In order to determine whether an arrangement is, or contains, a lease, the Group assesses the economic substance of the agreement, in order to determine whether fulfillment of the arrangement depends on the use of a specific asset and whether the agreement conveys the right to use an asset. If both conditions are met, at the inception of the arrangement the Group separates the payments and other considerations relating to the lease, at their fair values, from those corresponding to other components of the agreement. Leases that substantially transfer all the risks and rewards of ownership to the Group are classified as finance leases. All others leases are classified as operating leases. Finance leases in which the Group acts as a lessee are recognized at the inception of the arrangement. At that time, the Group records an asset based on the nature of the lease and a liability for the same amount, equal to the fair value of the leased asset or the present value of the minimum lease payments, if the latter is lower. Subsequently, the minimum lease payments are apportioned between finance expenses and reduction of the lease obligation. Finance expenses are recognized immediately in the income statement and allocated over the lease term, so as to achieve a constant interest rate on the remaining balance of the liability. Leased assets are depreciated on the same terms as other similar depreciable assets, as long as there is reasonable certainty that the lessee will acquire ownership of the asset at the end of the lease. If no such certainty exists, the leased assets are depreciated over the shorter of the useful lives of the assets and their lease term. In the case of operating leases, payments are recognized as an expense in the case of the lessee and as income in the case of the lessor, both on a straight-line basis, over the term of the lease unless another type of systematic basis of distribution is deemed more representative.
Financial instruments	g) Financial instruments Financial instruments are contracts that give rise to both a financial asset in one entity and a financial liability or equity instrument in another entity. g.1) Financial assets other than derivatives The Group classifies its financial assets other than derivatives, whether permanent or temporary, except for investments accounted for using equity method (See Notes 3.i and 12) and those held for sale, into four categories: • Loans and account receivables: The effective interest method is used to calculate the amortized cost of a financial asset or liability (or group of financial assets or financial liabilities) and of allocating finance income or cost over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash flows to be received or paid over the expected life of the financial instrument or, when appropriate, a shorter period to the net carrying amount of the financial asset or financial liability. • Held-to-maturity investments: • Financial assets at fair value with changes in net income: This category includes the trading portfolio and those financial assets that have been designated as such upon initial recognition and that are managed and evaluated on a fair value basis. They are measured in the consolidated statement of financial position at fair value, with changes in value recorded directly in income when they occur. • Available-for-sale financial assets: These investments are recognized in the consolidated statement of financial position at fair value when it can be reliably determined. For investments in equity instruments in unlisted companies or companies with lower levels of liquidity, normally the fair value cannot be reliably measured. When this occurs, those investments in equity instruments are measured at cost less impairment losses, if any. Changes in fair value, net of taxes, are recognized in other comprehensive income, until the investments are disposed of, at which time the amount accumulated in other comprehensive income is reclassified to profit or loss. If the fair value is lower than cost, and if there is objective evidence that the asset has been more than temporarily impaired, the difference is recognized directly in profit or loss. Purchases and sales of financial assets are accounted for using their trade date. g.2) Cash and cash equivalents This item within the consolidated statement of financial position includes cash and bank balances, time deposits, and other highly liquid investments (with original maturity of less than or equal to 90 days) that are readily convertible to cash and are subject to insignificant risk of changes in value. g.3) Impairment of financial assets The following criteria are used to determine if a financial asset has been impaired: • For trade receivables in the electricity generation, transmission and distribution segments, the Group’s policy is to recognize impairment losses when there is objective evidence that the balance will not be recoverable. In general terms, the Group’s entities has a defined policy to recognize an allowance for impairment losses based on the aging of past-due balances, except in those cases where a specific collective basis analysis is recommended, such as in the case of receivables from government-owned companies (See Note 8). • In the case of receivables of a financial nature, that are included in the “Loan and receivables” and “Investment held-to-maturity”, impairment is determined on case-by-case basis and is measured as the difference between the carrying amount and the present value of the future estimated cash flows discounted at the original effective interest rate (See Notes 7 and 20). • For financial investments available-for-sale, the criteria for impairment applied are described in Note 3.g.1. g.4) Financial liabilities other than derivatives Financial liabilities are recognized based on cash received, net of any costs incurred in the transaction. In subsequent periods, these obligations are measured at their amortized cost using the effective interest rate method (see Note 3.g.1). In the particular case that a liability is the hedged item in a fair value hedge, as an exception, such liability is measured at its fair value for the portion of the hedged risk. In order to calculate the fair value of debt, both when it is recorded in the statement of financial position and for fair value disclosure purposes as shown in Note 20, debt has been divided into fixed interest rate debt (hereinafter “fixed-rate debt”) and variable interest rate debt (hereinafter “floating-rate debt”). Fixed-rate debt is that on which fixed-interest coupons established at the beginning of the transaction are paid explicitly or implicitly over its term. Floating-rate debt is that debt issued at a variable interest rate, i.e., each coupon is established at the beginning of each period based on the reference interest rate. All debt has been measured by discounting expected future cash flows with a market interest rate curve based on the payment currency. g.5) Derivative financial instruments and hedge accounting Derivatives held by the Group are transactions entered into to hedge interest and/or exchange rate risk, intended to eliminate or significantly reduce these risks in the underlying transactions being hedged. Derivatives are recorded at fair value at the end of each reporting period as follows: if their fair value is positive, they are recorded within “Other financial assets”; and if their fair value is negative, they are recorded within “Other financial liabilities.” For derivatives on commodities, the positive fair value is recorded in “Trade and other receivables,” and negative fair values are recorded in “Trade and other liabilities.” Changes in fair value are recorded directly in profit or loss, except when the derivative has been designated for hedge accounting purposes as a hedge instrument (in a cash flow hedge) and all of the conditions for applying hedge accounting are met, including that the hedge be highly effective. In this case, changes are recognized as follows: • Fair value hedges: The underlying portion for which the risk is being hedged (hedged risk) and the hedge instrument are measured at fair value, and any changes in value of both items are recognized in the statement of comprehensive income by offsetting the effects in the same comprehensive income statement account. • Cash flow hedges: Changes in fair value of the effective portion of the hedged item and hedge instrument are recognized in other comprehensive income an accumulated in an equity reserve known as “Reserve for cash flow hedges.” The cumulative gain or loss in this reserve is reclassified to the statement of comprehensive income to the extent that the hedged item impacts the statement of comprehensive income offsetting the effect in the same comprehensive income statement account. Gains or losses from the ineffective portion of the hedging relationship are recorded directly in the statement of comprehensive income. A hedge relationship is considered highly effective when changes in fair value or in cash flows of the underlying item directly attributable to the hedged risk are offset by changes in fair value or cash flows of the hedging instrument, with an effectiveness ranging from 80% to 125%. As a general rule, long-term commodity purchases or sales agreements are recognized in the statement of financial position at their fair value at the end of each reporting period, recognizing any differences in value directly in profit or loss, except for, when all of the following conditions are met: • The sole purpose of the agreement is for the Group’s own use, which is understood as: (i) in the case of fuel purchase agreements its used to generate electricity; (ii) in the case of electrical energy purchased for sale, its sale to the end-customers; and, (i) in the case of electricity sales its sale to the end-customers. • The Group’s future projections evidence the existence of these agreements for its own use. • Past experience with agreements evidence that they have been utilized for the Group’s own use, except in certain isolated cases when for exceptional reasons or reasons associated with logistical issues have been used beyond the control and projection of the Group. • The agreement does not stipulate settlement by differences and the parties have not made it a practice to settle similar contracts with differences in the past. The long-term commodity purchase or sale agreements maintained by the Group, which are mainly for electricity, fuel, and other supplies, meet the conditions described above. Thus, the purpose of fuel purchase agreements is to use them to generate electricity, electricity purchase contracts are used to sell to end-customers, and electricity sale contracts are used to sell the Group’s own products. The Group also evaluates the existence of derivatives embedded in contracts or financial instruments to determine if their characteristics and risk are closely related to the host contract, provided that when taken as a whole they are not being accounted for at fair value. If they are not closely related, they are recorded separately and changes in value are accounted for directly in profit or loss. g.6) Derecognition of financial assets and liabilities Financial assets are derecognized when: • The contractual rights to receive cash flows from the financial asset expire or have been transferred or, if the contractual rights are retained, the Group has assumed a contractual obligation to pay these cash flows to one or more recipients. • The Group has substantially transferred all the risks and rewards of ownership of the financial asset, or, if it has neither transferred nor retained substantially all the risks and rewards, when it does not retain control of the financial asset. Transactions in which the Group retains substantially all the inherent risks and rewards of ownership of the transferred asset, it continues recognizing the transferred asset in its entirety and recognizes a financial liability for the consideration received. Transactions costs are recognized in profit and loss by using the effective interest method (See Note 3.g.1). Financial liabilities are derecognized when they are extinguished, that is, when the obligation arising from the liability has been paid or cancelled, or has expired. g.7) Offsetting financial assets and liabilities. The Group offsets financial assets and liabilities and the net amount is presented in the statement of financial position when, and only when: • There is a legally enforceable right to set off the recognized amounts; and • There is an intention to settle on a net basis, or to realize the asset and settle the liability simultaneously. These rights can only be legally enforceable within the normal course of business, or in case of default, insolvency or bankruptcy, of one or all of the counterparts. g.8) Financial guarantee contracts Financial guarantee contracts, such as guarantees given by the Group to third parties, are initially recognized at fair value, adjusting the transaction costs that are directly attributable to the issuance of the guarantee. Subsequently to initial recognition, financial guarantee contracts are measured at the higher of: • The amount determined under accounting policy describe in Note 3.l; and • The amount initially recognized less, when appropriate, any accumulated amortization. • Registered in accordance with the revenue recognition policy (see Note 3.p).
Measurement of fair value	h) Measurement of fair value The fair value of an asset or liability is defined as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market, namely, the market with the greatest volume and level of activity for that asset or liability. In the absence of a principal market, it is assumed that the transaction is carried out in the most advantageous market available to the entity, namely, the market that maximizes the amount that would be received to sell the asset or minimizes the amount that would be paid to transfer the liability. In estimating fair value, the Group uses valuation techniques that are appropriate for the circumstances and for which there are sufficient data to conduct the measurement. The Group maximizes the use of relevant observable data and minimizes the use of unobservable data. Considering the hierarchy of the data used in these valuation techniques, the assets and liabilities measured at fair value can be classified into the following levels: Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 Inputs other than quoted prices included within Level 1 that are observable for the assets or liabilities, either directly (i.e. as prices) or indirectly (i.e. derived from prices). The methods and assumptions used to determine the fair values at Level 2 by type of financial asset or financial liability take into consideration estimated future cash flows discounted at zero coupon interest rate curves for each currency. All the valuations described are carried out using external tools, such as “Bloomberg”. Level 3: Inputs for assets or liabilities that are not based on observable market data (unobservable inputs). The Group takes into account the characteristics of the asset or liability when measuring fair value, in particular: • For non-financial assets, fair value measurement takes into account the ability of a market participant to generate economic benefits by using the asset in its highest and best use or by selling it to another market participant that would use the asset in its highest and best use; • For liabilities and equity instruments, the fair value measurement assumes that the liability would not be settled and an equity instrument would not be cancelled or otherwise extinguished on the measurement date. The fair value of the liability reflects the effect of non-performance risk, namely, the risk that an entity will not fulfill the obligation, which includes, but is not limited to, the Group’s own credit risk; • For derivatives not quoted in an organized market, the Group measures fair value by using the discounted cash flow method and generally accepted options valuation models, based on current and future market conditions as of year-end. This methodology also adjusts the value based on the Company’s own credit risk (Debt Valuation Adjustment, DVA), and the counterparty risk (Credit Valuation Adjustment, CVA). These CVA and DVA adjustments are measured on the basis of the potential future exposure of the instrument (creditor or borrower position) and the risk profile of both the counterparties and the Group itself. • In the case of financial assets and financial liabilities with offsetting positions in market risks or counterparty credit risks, it is permitted to measure the fair value on a net basis. However, this must be consistent with the manner in which market participants would price the net risk exposure at the measurement date. Financial assets and liabilities measured at fair value are disclosed in Note 20.3.
Investments accounted for using the equity method	i) Investments accounted for using the equity method The Group’s interests in joint ventures and associates are recognized using the equity method. Under the equity method, an investment in an associate or joint venture is initially recognized at cost. As of the acquisition date, the investment is recognized in the statement of financial position based on the share of its equity that the Group’s interest represents in its capital, adjusted for, if appropriate, the effect of transactions with Group’s entities, plus any goodwill generated in acquiring the entity. If the resulting amount is negative, zero is recorded for that investment in the statement of financial position, unless the Group has a present obligation (either legal or constructive) to support the investee’s negative equity situation, in which case a provision is recognized. Goodwill from associates or joint ventures is included in the carrying amount of the investment. It is not amortized but is subject to impairment testing as part of the overall investment carrying amount when impairment indicators exist. Dividends received from these investments are deducted from the carrying amount of the investment, and any profit or loss obtained from them to which the Group is entitled based on its ownership interest is recognized under “Share of profit (loss) of associates accounted for using equity method.” Appendix 3. “Associates and Joint Ventures” to these consolidated financial statements describes the relationship of the Company and each of these companies.
Non-current assets (or disposal group of assets) held for sale or held for distribution to owners and discontinued operations	j) Non-current assets (or disposal group of assets) held for sale or held for distribution to owners and discontinued operations. Non-current assets, including property, plant and equipment; intangible assets; investments accounted for using the equity method, joint ventures, and disposal groups (a group of assets to be disposed of and the liabilities directly associated with those assets), are classified as: - Held for sale, if their carrying amount will be recovered principally through a sale transaction rather than through continuing use - Held for distribution to owners, when the Company is committed to distribute the asset (or disposal group) to the owners. For the above classification, the assets must be available for immediate sale or distribution in their present condition and its sale or distribution is highly probable. For this transaction to be considered highly probable, management must be committed to the sale or distribution and actions to complete the transaction must have been initiated and should be expected to be completed within one year from the date of classification. Actions required to complete the sale or distribution plan should indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. The probability of shareholders’ approval (if required in the jurisdiction) should be considered as part of the assessment of whether the sale or distribution is highly probable. Non-current assets or disposal groups held-for-sale or held for distribution to owners are measured at the lower of their carrying amount and fair value less costs to sell or costs to distribute, as appropriate. Depreciation and amortization on these assets cease when they meet the criteria to be classified as non-current assets held for sale or held for distribution to owners. Assets that are no longer classified as held for sale or held for distribution to owners, or are no longer part of a disposal group, are measured at the lower of their carrying amounts before being classified as held for sale or held for distribution less any depreciations, amortizations or revaluations that would have been recognized if they had not been classified as held for sale or held for distribution to owners and their recoverable amount at the date of subsequent decision where would be reclassified as non-current assets. Non-current assets held for sale and the components of the disposal groups classified as held for sale or held for distribution to owners are presented in the consolidated statement of financial position as a single line item within assets called “Non-current assets or disposal groups held for sale or for distribution to owners,” and the respective liabilities are presented as a single line item within liabilities called “Liabilities included in disposal groups held for sale or for distribution to owners.” The Group classifies as discontinued operations those components of the Group that either have been disposed of, or are classified as held for sale, and: (i) represents a separate major lines of business or geographical area of operations; (ii) is a part of a single coordinated plan to dispose a separate major line of business or geographical area of operations; or (iii) is a subsidiary acquired exclusively with a view to resale. The components of profit or loss after taxes from discontinued operations and the post-tax gain or loss recognized on the measurement to fair value less costs to sell or on the disposal of the assets or groups constituting the discontinued operation are presented as a single line item in the consolidated comprehensive income statement as “Income after tax from discontinued operations”.
Inventories	k) Inventories Inventories are measured at their weighted average acquisition cost or the net realizable value, whichever is lower. The net realizable value is the estimated selling price in the ordinary course of business less the estimated costs necessary to make the sale.
Provisions	l) Provisions Provisions are recognized when the Group has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of economic benefits will be required to settle the obligation, and a reliable estimate can be made of the amount of the obligation. The amount recognized as a provision is the best estimate of the consideration required to settle the present obligation at the end of the reporting period, taking into account the risks and uncertainties surrounding the obligation. When a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows (when the effect of the time value of money is material). The unwinding of the discount is recognized as finance cost. Incremental legal cost expected to be incurred in resolving a legal claim is included in measuring of the provision. Provisions are reviewed at the end of each reporting period and adjusted to reflect the current best estimate. If it is no longer probable that an outflow of resources embodying economic benefits will be required to settle the obligation, the provision is reversed. A contingent liability does not result in the recognition of a provision. Legal costs expected to be incurred in defending a legal claim are expensed as they are incurred. Significant contingent liabilities are disclosed unless the likelihood of an outflow of resources embodying economic benefits is remote. l.1) Provisions for post-employment benefits and similar obligations Some of the Group’s subsidiaries have pension and similar obligations to their employees. Such obligations, which combine defined benefits and defined contributions, are basically formalized through pension plans, except for certain non-monetary benefits, mainly electricity supply commitments, which, due to their nature, have not been externalized and are covered by the related in-house provisions. For defined benefit plans, the cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. Past service costs relating to changes in benefits are recognized immediately. The defined benefit plan obligations in the statement of financial position represent the present value of the accrued obligations, adjusted, once the fair value of the different plans’ assets has been deducted, if any. For each of the defined benefit plans, any deficit between the actuarial liability and the plan assets (if any) is recognized under line item “Provisions for employee benefits” within current and non-current liabilities in the statement of financial position. Actuarial gains and losses arising in measurement of both the plan liabilities and the plan assets (if any, and excluding interest) are recognized directly in other comprehensive income. Contributions to defined contribution benefit plans are recognized as an expense in the statement of comprehensive income when the employees have rendered their services.
Translation of foreign currency balances	m) Translation of foreign currency balances Transactions carried out by each entity in a currency other than its functional currency are recognized using the exchange rates prevailing as of the date of the transactions. During the year, any differences that arise between the prevailing exchange rate at the date of the transaction and the exchange rate as of the date of collection or payment are recognized as “Foreign currency exchange differences” in the consolidated statement of comprehensive income. Likewise, at the end of each reporting period, receivable or payable balances denominated in a currency other than each entity’s functional currency are translated using the closing exchange rate. Any differences are recorded as “Foreign currency exchange differences” in the consolidated statement of comprehensive income. The Group has established a policy to hedge the portion of revenue from its consolidated entities that is directly linked to variations in the U.S. dollar, through obtaining financing in such currency. Exchange differences related to this debt, which is regarded as the hedging instrument in cash flow hedge transactions, are recognized, net of taxes, in other comprehensive income and are accumulated in an equity reserve and reclassified to profit or loss when the hedged cash flows affect profit or loss. This term has been estimated at ten years.
Current/non-current classification	n) Current/non-current classification In these consolidated statements of financial position, assets and liabilities expected to be recovered or settled within twelve months are presented as current items, except for post-employment and other similar obligations. Those assets and liabilities expected to be recovered or settled in more than twelve months are presented as non-current items. Deferred income tax assets and liabilities are classified as non-current. When the Group have any obligations that mature in less than twelve months but can be refinanced over the long term at the Group’s discretion, through unconditionally available credit agreements with long-term maturities, such obligations are classified as non-current liabilities.
Income taxes	o) Income taxes Income tax expense for the period is determined as the sum of current taxes from the Group’s different entities and results from applying the tax rate to the taxable income for the period, after permitted deductions have been made, plus any changes in deferred tax assets and liabilities and tax credits, both for tax losses and deductions. Differences between the carrying amount and tax basis of assets and liabilities generate deferred tax assets and liabilities, which are calculated using the tax rates expected to apply when the assets and liabilities are realized or settled, based on tax rates that have been enacted or substantively enacted by the end of the reporting period. Deferred tax assets are recognized for all deductible temporary differences, tax losses and unused tax credits to the extent that it is probable that sufficient future taxable profits exist to recover the deductible temporary differences and make use of the tax credits. Such deferred tax asset is not recognized if the deductible temporary difference arises from the initial recognition of an asset or liability that: • Did not arise from a business combination, and • At initial recognition affected neither accounting profit nor taxable profit (loss). With respect to deductible temporary differences associated with investments in subsidiaries, associates and joint arrangements, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profits will be available against which the temporary differences can be utilized. Deferred tax liabilities are recognized for all temporary differences, except those derived from the initial recognition of goodwill and those that arose from investments in subsidiaries, associates and joint ventures in which the Group can control their reversal and where it is probable that they will not be reversed in the foreseeable future. Current tax and changes in deferred tax assets or liabilities are recorded in profit or loss or in equity, depending on where the gains or losses that triggered these tax entries have been recognized. Any tax deductions that can be applied to current tax liabilities are credited to earnings within the line item “Income tax expenses”, except when exists uncertainty about their tax realization, in which case they are not recognized until they are effectively realized, or when they correspond to specific tax incentives, in which case they are recorded as government grants. At the end of each reporting period, the Group reviews the deferred taxes assets and liabilities recognized, and makes, if any, necessary corrections based on the results of this analysis. Deferred tax assets and deferred tax liabilities are offset in the consolidated statement of financial position if has a legally enforceable right to set off current tax assets against current tax liabilities, and only when the deferred taxes relate to income taxes levied by the same taxation authority.
Revenue and expense recognition	p) Revenue and expense recognition Revenue is recognized when the gross inflow of economic benefits arising in the course of the Group’s ordinary activities in the period occurs, provided that this inflow of economic benefits results in an increase in total equity other than increases relating to contributions from equity participants and such benefits can be measured reliably. Revenues and expenses are recognized on an accrual basis and depending on the type of transaction; the following criteria for recognition are taken: • Generation and transmission of electricity : Revenue is recognized based on physical delivery of energy and power, at prices established in the respective contracts, at prices stipulated in the electricity market by applicable regulations or at marginal cost determined on the spot market, as appropriate. This revenue includes an estimate of the service provided and not billed until the closing date (See Note 2.3 and 25). • Distribution of electricity : Revenue is recognized based on the amount of energy supplied to customers during the period, at prices established in the respective contracts or at prices stipulated in the electricity market by applicable regulations, as appropriate. This revenue includes an estimate of the energy supplied but not billed and for which the customers’ meters have not been read yet (See Note 2.3 and 25). Revenue from rendering of services is only recognized when it can be estimated reliably, by reference to the stage of completion of the service rendered at the date of the statement of financial position. When the outcome of a transaction involving the rendering of services cannot be estimated reliably, revenue is recognized only to the extent of the expenses recognized that are recoverable. (See Note 25) Revenue from sales of goods is recognized based on the economic substance of the transaction and are recognized when all and each of the following conditions are met: • the entity has transferred to the buyer the significant risks and rewards of ownership of the goods; • the entity retains neither continuing managerial involvement to the degree usually associated with ownership nor effective control over the goods sold; • the amount of revenue can be measured reliably; • it is probable that the economic benefits associated with the transaction will flow to the entity; and • the costs incurred or to be incurred in respect of the transaction can be measured reliably. Revenue is measured at the fair value of the consideration received or receivable that gives rise to the revenue. In arrangements under which the Group will perform multiple revenue-generating activities (multiple-element arrangement), the recognition criteria are applied to the separately identifiable components of the transaction in order to reflect the substance of the transaction or to two or more transactions together when they are linked in such a way that the commercial effect cannot be understood without reference to the series of transactions as a whole. The Group excludes from revenue those gross inflows of economic benefits it receives when it acts as an agent or commission agent on behalf of third parties, and only recognizes as revenue economic benefits received for its own activity. When goods or services are exchanged or swapped for goods or services of a similar nature and value, the exchange is not regarded as a revenue-generating transaction. The Group recognizes the net amount of non-financial asset purchase or sale contracts that are settled for a net amount of cash or through some other financial instruments. Contracts entered into and maintained for the purpose of receiving or delivering these non-financial assets are recognized on the basis of the contractual terms of the purchase, sale, or usage requirements expected by the entity. Financial income (expense) is recognized using the effective interest rate applicable to the outstanding principal over the repayment period. Expenses are recognized on an accruals basis, immediately in the event of expenditures that do not generate future economic benefits or when they do not meet the requirements for recognizing them as assets.
Earnings per share	q) Earnings per share Basic earnings per share are calculated by dividing net income attributable to shareholders of the Parent Company by the weighted average number of ordinary shares outstanding during the period, excluding the average number of shares of the Parent Company held by other subsidiaries within the Group, if any. Basic earnings per share for continuing and discontinued operations are calculated by dividing net income from continuing and discontinued operations attributable to shareholders of the Parent Company (the numerator) by the weighted average number of ordinary shares outstanding (the denominator) during the year, excluding the average number of shares of the Parent Company held by other subsidiaries within the Group, if any.
Dividends	r) Dividends Article No. 79 of the Chilean Corporations Act 18,046 establishes that, unless unanimously agreed otherwise by the shareholders of all issued shares, listed corporations must distribute a cash dividend to shareholders on an annual basis, pro rata to the shares owned or the proportion established in the company’s by-laws if there are preferred shares, of at least 30% of net income for each period, except when accumulated losses from prior years must be absorbed. As it is practically impossible to achieve a unanimous agreement given the Company’s highly fragmented share capital, at the end of each reporting period the amount of the minimum statutory dividend obligation to its shareholders is determined, net of interim dividends approved during the fiscal year, and then accounted for in “Trade and other current payables” and “Accounts payable to related companies”, as appropriate, and recognized in equity. Interim and final dividends are deducted from equity as soon as they are approved by the competent body, which in the first case is normally the Company’s Board of Directors and in the second case is the Ordinary Shareholders’ Meeting.
Statement of cash flows	s) Statement of cash flows The statement of cash flows reflects changes in cash and cash equivalents that took place during the period, determined with the direct method. It uses the following expressions and corresponding meanings: - Cash flows: inflows and outflows of cash or cash equivalents, which are defined as highly liquid investments maturing in less than three months with a low risk of changes in value. - Operating activities: the principal revenue-producing activities of the Group and other activities that cannot be considered investing or financing activities. - Investing activities: the acquisition and disposal of long-term assets and other investments not included in cash and cash equivalents. - Financing activities: activities that result in changes in the size and composition of the total equity and borrowings of the Group.

Basis of Presentation of the 52

Basis of Presentation of the Consolidated Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Statement Of Compliance And Basis Of Presentation [Abstract]
Disclosure Of Proportion Of Net Assets Market Value Explanatory	(ii) Cash and cash equivalents remaining after excluding the 2013 capital increase proceeds, were allocated based on the exercise carried out by Enersis’ management, the ratios obtained for the division of the cash and cash equivalents, were as follows: Proportion of Entity Chile Américas Enersis 42% 58% Endesa S.A. 66% 34% Chilectra S.A. 63% 37%
Disclosure Of Breakdown Of Allocated Employees Explanatory	The table below sets forth the breakdown of employees allocated to the Company and Enel Américas: Employee Entity Chile Américas Enersis 391 87 Endesa S.A. 925 7 Chilectra S.A. 668 2 Total 1,984 96

Accounting Policies Applied (Ta

Accounting Policies Applied (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies Applied [Abstract]
Summary of Estimated Useful Lives of Property, Plant and Equipment	The following table sets forth the main categories of property, plant and equipment with their respective estimated useful lives: Categories of Property, plant and equipment Years of estimated useful lives Buildings 10 – 60 Plant and equipment 6 – 65 IT equipment 3 – 15 Fixtures and fittings 2 – 35 Motor vehicles 5 – 10 Additionally, the following table sets forth more details on the useful lives of plant and equipment items: Years of estimated useful lives Generating facilities: Hydroelectric plants Civil engineering works 10 – 65 Electromechanical equipment 10 – 45 Fuel oil/coal-fired power plants 25 – 40 Combined cycle power plants 10 – 25 Renewable energy power plants 20 Transmission and distribution facilities: High-voltage network 10 – 60 Low- and medium-voltage network 10 – 50 Measuring and remote control equipment 10 – 50 Primary substations 6 – 25 Natural gas transport facilities Pipelines 20

Non-Current Assets or Disposa54

Non-Current Assets or Disposal Groups Classified as Held For Sale (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Noncurrent Assets And Disposal Groups Classified As Held For Sale [Abstract]
Summary of Carrying Amount of Centrales Hidroeléctricas de Aysén S.A. Classified as Non-Current Assets Held For Sale	Equity of Centrales Hidroeléctricas de Aysén S.A. Ownership Interest Carrying Amount of Centrales Hidroeléctricas de Aysén S.A. ThCh$ % ThCh$ 8,245,555 51 % 4,205,233
Summary of Additional Financial Information on Hidroaysén	- Additional financial information on Hidroaysén: Centrales Hidroeléctricas de Aysén S.A. 12/31/2017 ThCh$ Total Current Assets 355,835 Cash and cash equivalents 355,446 Total Non Current Assets 8,030,172 Land 8,030,172 Total Current Liabilities 139,182 Other fixed operating expenses (8,144,855) Interest income 24,829 Profit (loss) (8,193,671)

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Summary of Cash and Cash Equivalents	a) The detail of cash and cash equivalents as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Cash and Cash Equivalents ThCh$ ThCh$ Cash balances 53,875 48,002 Bank balances 35,208,300 48,556,736 Time deposits 11,155,249 17,325,478 Other fixed-income instruments 373,038,602 180,068,976 Total 419,456,026 245,999,192
Summary of Cash and Cash Equivalents by Currency	b) The detail of cash and cash equivalents by currency is as follows: As of December 31, 2017 2016 Currency ThCh$ ThCh$ Chilean peso 399,164,753 235,993,647 Argentine peso 6,263,344 4,807,406 Euros 11,594 — U.S. dollar 14,016,335 5,198,139 Total 419,456,026 245,999,192
Summary of Cash and Cash Equivalents Received from Sale of Shares of Subsidiaries and Associates	d) The following tables sets forth cash and cash equivalents that have been received from the sale of shares of as of December 31, 2017, 2016 and 2015: As of December 31, 2017 2016 2015 (*) Loss of control at Subsidiaries ThCh$ ThCh$ ThCh$ Amounts received for the sale of subsidiaries — 3,003 25,000,000 Amounts of cash and cash equivalents in entities sold — — (18,360,347) Total net — 3,003 6,639,653 (*) See Note 2.4.1. As of December 31, 2017 (*) 2016 (**) 2015 Loss of control at Associates ThCh$ ThCh$ ThCh$ Amounts received for the sale of Associates 115,582,806 132,820,800 — Total 115,582,806 132,820,800 — (*) See Note 5. (**) See Note 12.b.
Summary of Reconciliation of Liabilities Arising from Financing Activities	e) Reconciliation of liabilities arising from financing activities: Liabilities arising from financing activities Balance as of 1/1/2017 (1) Financing Cash Flows Non-Cash Changes Balance as of 12/31/2017 (1) From Used Interest paid Total Changes in fair value Foreign exchange differences Financial costs (2) Other changes ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Bank loans (Note 18.1) 4,274 — (4,156 ) (12,581 ) (16,737 ) — — 12,585 — 122 Unsecured obligations (Note 18.1) 802,306,161 — (5,530,327 ) (43,514,578 ) (49,044,905 ) — (33,226,098 ) 43,544,427 — 763,579,585 Finance leases (Note 18.1) 17,749,647 — (2,592,236 ) — (2,592,236 ) — (1,359,668 ) 811,171 — 14,608,914 Financial derivatives for hedging (Note 7 y 18) 23,640,892 — (3,543,399 ) — (3,543,399 ) (25,059,561 ) (23,488,917 ) 3,473,938 (4,501,595 ) (29,478,642 ) Loans to related parties — 150,000,000 (150,000,000 ) (289,800 ) (289,800 ) — — 289,800 — — Other obligations — — (1,305,389 ) — (1,305,389 ) — — 1,305,389 — — Total 843,700,974 150,000,000 (162,975,507 ) (43,816,959 ) (56,792,466 ) (25,059,561 ) (58,074,683 ) 49,437,310 (4,501,595 ) 748,709,979 (1) Balance corresponds to current and non-current portion. (2) Other changes include interest accruals

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Financial Assets [Abstract]
Summary of Other Financial Assets	The detail of other financial assets as of December 31, 2017 and 2016, is as follows: Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Other Financial Assets ThCh$ ThCh$ ThCh$ ThCh$ Available-for-sale financial investments – unquoted equity securities or with limited liquidity — — 2,595,343 2,616,239 Available-for-sale financial investments – quoted equity Securities — — 33,158 25,381 Financial assets held to maturity (*) 185,913 462,801 — 652,733 Hedging derivatives 20,038,433 121,443 30,789,703 25,533,189 Non-Hedging derivatives 402,716 — — — Total 20,627,062 584,244 33,418,204 28,827,542 (*) See Note 20.1.a The amounts included in “financial assets held to maturity” correspond mainly to time deposits and other highly liquid investments that are readily convertible to cash and subject to a low risk of changes in value, but that do not fulfill the definition of cash equivalent as defined in Note 3.g.2 (e.g. with maturity over 90 days from time of investment).

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Summary of Trade and Other Receivables, Net	a) The detail of trade and other receivables as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Trade and Other Receivables, Gross ThCh$ ThCh$ ThCh$ ThCh$ Trade and other receivables, gross 463,626,345 36,182,399 484,533,736 33,500,105 Trade receivables, gross (2) 415,039,522 1,917,828 414,184,116 8,369,878 Other receivables, gross (1) 48,586,823 34,264,571 70,349,620 25,130,227 As of December 31, 2017 2016 Current Non-current Current Non-current Trade and Other Receivables, Net ThCh$ ThCh$ ThCh$ ThCh$ Trade and other receivables, net 419,752,286 36,182,399 445,071,856 33,500,105 Trade and other receivables, net (2) 380,379,326 1,917,828 382,487,300 8,369,878 Other receivables, net (1) 39,372,960 34,264,571 62,584,556 25,130,227 (1) As of December 31, 2017, it mainly includes accounts receivable related to loan and advances to employees for ThCh$9,709,051 (ThCh$11,167,266 as of December 31, 2016); recoverable taxes (VAT) for ThCh$18,318,007 (ThCh$18,658,849 as of December 31, 2016); recoverable taxes in Peru of ThCh$0 (ThCh$15,035,980 as of December 31, 2016); payments in advance to suppliers for ThCh$5,360,307 (ThCh$4,804,161 as of December 31, 2016); lease receivables for ThCh$34,550,131 (ThCh$23,296,966 as of December 31, 2016) and other miscellaneous receivables for ThCh$5,700,035 (ThCh$8,266,102 as of December 31, 2016) (2) As of December 31, 2017, our subsidiary Enel Distribución Chile S.A. recognized unbilled revenue and trade and other accounts receivable for the difference between current and effective Average Node Prices and Short Term Node Prices for ThCh$4,117,611 (ThCh$8,581,761 as of December 31, 2016) to be billed and charge to regulated end-customers.
Summary of Balance of Past Due But Not Impaired Trade Receivables	c) As of December 31, 2017 and 2016, the balance of past due but not impaired trade receivables is as follows Trade Receivables Past Due But Not Impaired (*) As of December 31, 2017 2016 ThCh$ ThCh$ Less than three months 54,488,473 52,259,795 Between three and six months 9,008,195 10,795,139 Between six and twelve months 7,123,391 15,842,450 More than twelve months 16,067,867 23,338,216 Total 86,687,926 102,235,600 (*) These balances correspond to non-impaired past due accounts and the portion does not affect the provision of other accounts due receivable.
Summary of Reconciliation of Changes in the Allowance for Impairment of Trade Receivables	d) The reconciliation of changes in the allowance for impairment of trade receivables is as follows: Current and Non-current Trade Receivables Past Due and Impaired ThCh$ Balance at December 31, 2015 35,877,490 Increases (decreases) for the year (*) 5,141,179 Amounts written off (1,556,789 ) Balance at December 31, 2016 39,461,880 Increases (decreases) for the year (*) 7,937,817 Amounts written off (3,525,638 ) Balance at December 31, 2017 43,874,059 (*) See Note 28 for impairment of financial assets.
Lease Receivables [Member]
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Schedule of Minimum Lease Payments Receivable	As of December 31, 2017 and 2016, the present value of minimum lease payments receivable is as follows: 12-31-2017 12-31-2016 Gross Interest Present Value Gross Interest Present Value ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Less than one year 4,380,499 944,578 3,435,921 2,807,385 696,299 2,111,086 From one to five years 17,521,998 3,617,167 13,904,831 10,011,194 1,461,944 8,549,250 More than five years 18,127,398 918,019 17,209,379 15,021,707 2,385,077 12,636,630 Total 40,029,895 5,479,764 34,550,131 27,840,286 4,543,320 23,296,966 Lease arrangements are related to public lightning developments mainly to municipalities.

Balances and Transactions Wit58

Balances and Transactions With Related Parties (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Transactions Between Related Parties [Abstract]
Summary of Receivables from and Accounts Payable to Related Parties	The balances of accounts receivable and payable between the Group and its non-consolidated related companies are as follows: a) Receivables from related parties Taxpayer ID Current Non-current Number Company Country Relationship Currency Description of transaction Term of transaction 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ThCh$ ThCh$ ThCh$ ThCh$ Foreign Endesa España Spain Common Immediate Parent CH$ Other services Less than 90 days 70,371 83,448 — — Foreign Endesa España Spain Common Immediate Parent Euros Other services Less than 90 days 13,077 — — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 1,031,125 129,755 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 79,217 57,827 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 86,089 — — — 96.880.800-1 Empresa Electrica Puyehue S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 0 64 — — 76.418.940-k GNL Chile S.A. Chile Associate CH$ Advance natural gas purchase Less than 90 days 18,793,098 16,780,275 — — Foreign Endesa Generación Spain Common Immediate Parent Euros Other services Less than 90 days 36,067 36,067 — — Foreign Endesa Generación Spain Common Immediate Parent US$ Commodity derivatives Less than 90 days — 587,224 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent CH$ Other services Less than 90 days 8,144 8,144 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent Euros Other services Less than 90 days 290,838 278,834 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 8,511 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 21,484,590 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Commodity derivatives Less than 90 days 20,751,714 22,321,017 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 16,994 142,926 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Tolls Less than 90 days 134 8 — — 76.126.507-5 Parque Eolico Talinay Oriente SA Chile Common Immediate Parent CH$ Other services Less than 90 days 49,677 — — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 50,594 98,353 — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 35,572 21,774 — — 76.321.458-3 Sociedad Almeyda Solar SpA Chile Common Immediate Parent CH$ Other services Less than 90 days 19,877 — — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 41,487 243,946 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 425 — — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 54,638 — — — Foreign Enel SpA Italy Parent CH$ Other services Less than 90 days 157,701 194,879 — — Foreign Enel SpA Italy Parent Euros Other services Less than 90 days 215,289 145,858 — — 76.052.206-6 Parque Eolico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Energy sales Less than 90 days 75,956 81,377 — — 76.052.206-6 Parque Eolico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 49,677 — — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Energy sales Less than 90 days 28,835 25,559 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 3,443 — — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Other services Less than 90 days 310,179 — — — 96.210.110-10 Enel Green Power Chile S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 162,594 34,851 — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent CH$ Other services Less than 90 days 47,998 2,121,609 — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent Euros Other services Less than 90 days 116,436 — — — Foreign Enel Brasil S.A. Brazil Common Immediate Parent US$ Other services Less than 90 days 2,068,594 36,276 — — 76.532.379-7 Chilectra Inversud Chile Common Immediate Parent CH$ Other services Less than 90 days — 150,246 — — Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent CH$ Other services Less than 90 days — 1,614,168 — — Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent CH$ Other services Less than 90 days 432,233 — — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CH$ Other services Less than 90 days 29,989 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days 13,746 — — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days — 13,327 — — Foreign Codensa S.A. Colombia Common Immediate Parent CH$ Other services Less than 90 days 791,622 423,462 — — Foreign Codensa S.A. Colombia Common Immediate Parent Euros Other services Less than 90 days 29,221 — — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days 15,192 1,328,268 — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent US$ Other services Less than 90 days 758,841 — — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent PS$ Other services Less than 90 days — 15,192 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Mercantile current account Less than 90 days — 519,570 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 1,487,709 2,356,523 — — 94.271.000-3 Enel Américas S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days 54,949 — — — Foreign Enel Green Power Colombia SAS Colombia Common Immediate Parent CH$ Other services Less than 90 days 46,557 — — — Foreign Enel Generación Piura S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days — 346,061 — — Foreign Enel Generación Piura S.A. Peru Common Immediate Parent US$ Other services Less than 90 days 165,875 — — — Foreign Enel Perú S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days — 341,948 — — Foreign Compañía Energética Veracruz S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days 639,233 — — Foreign Chinango S.A.C. Peru Common Immediate Parent CH$ Other services Less than 90 days 17,410 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent CH$ Other services Less than 90 days 262,694 — — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent US$ Other services Less than 90 days 82,830 — — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent CH$ Energy sales Less than 90 days 10,096 — — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent CH$ Other services Less than 90 days 354,283 1,251,369 — — Foreign Enel Green Power Mexico Mexico Common Immediate Parent US$ Other services Less than 90 days 152,495 — — — Foreign Enel Green Power Perú Peru Common Immediate Parent US$ Other services Less than 90 days 177,478 — — — Foreign Enel Green Power Brasil Brazil Common Immediate Parent US$ Other services Less than 90 days 37,936 — — — Foreign Enel Green Power Brasil Participacoes LTDA Brazil Common Immediate Parent US$ Other services Less than 90 days 9,188 — — — Foreign Empresa Distribuidora del Sur S.A. Argentina Common Immediate Parent CH$ Other services Less than 90 days 796,750 398,957 — — Total 71,856,046 52,858,384 — — b) Accounts payable to related parties Taxpayer ID Current Non-current Number Company Country Relationship Currency Description of transaction Terms of transaction 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ThCh$ ThCh$ ThCh$ ThCh$ Foreign Endesa España Spain Common Immediate Parent CH$ Other services Less than 90 days — 273,569 — — Foreign Endesa España Spain Common Immediate Parent Euros Other services Less than 90 days 277,868 — Foreign Enel Brasil Brazil Common Immediate Parent US$ Other services Less than 90 days 77,680 — — — Foreign Enel Brasil Brazil Common Immediate Parent CH$ Other services Less than 90 days — 85,864 — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent US$ Other services Less than 90 days — 63,992 — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent AR$ Other services Less than 90 days 74,740 — — — Foreign Enel Trading Argentina S.R.L. Argentina Common Immediate Parent CH$ Other services Less than 90 days — 13,574 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent US$ Other services Less than 90 days — 5,461 — — Foreign Emgesa S.A. E.S.P. Colombia Common Immediate Parent CP$ Other services Less than 90 days 4,551 — — — 94.271.000-2 Enel Américas Chile Common Immediate Parent CH$ Loan Less than 90 days 4,650 974,374 — — 94.271.000-2 Enel Américas Chile Common Immediate Parent US$ Other services Less than 90 days 912,731 — — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent US$ Other services Less than 90 days — 2,239 — — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent PS$ Other services Less than 90 days 2,110 — — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 3,175,956 1,695,658 — — 96.524.140-K Empresa Electrica Panguipulli S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 71,648 92,005 — — 96.806.130-5 Electrogas S.A. Chile Associate CH$ Tolls Less than 90 days — 331,447 — — 76.418.940-k GNL Chile S.A. Chile Associate US$ Gas Purchase Less than 90 days 8,100,426 4,872,264 — — Foreign Endesa Generación Spain Common Immediate Parent CH$ Coal Purchase Less than 90 days — 486,180 — — Foreign Endesa Generación Spain Common Immediate Parent CH$ Other services Less than 90 days 22,257 379,731 — — Foreign Endesa Generación Spain Common Immediate Parent Euros Other services Less than 90 days 214,667 — — — Foreign Enel Iberoamérica S.R.L Spain Parent Euros Other services Less than 90 days 749,834 158,909 — — Foreign Enel Iberoamérica S.R.L Spain Parent CH$ Dividends Less than 90 days — 57,755,885 — — Foreign Enel Iberoamérica S.R.L Spain Parent CH$ Other services Less than 90 days 35 867,838 — — Foreign Enel Distribuzione Italy Common Immediate Parent Euros Other services Less than 90 days 3,187,971 705,730 — — Foreign Enel Produzione Italy Common Immediate Parent Euros Other services Less than 90 days 10,501,963 118,261 318,518 — Foreign Enel Produzione Italy Common Immediate Parent CH$ Other services Less than 90 days — 483,665 — — Foreign Enel Ingegneria e Ricerca Italy Common Immediate Parent CH$ Other services Less than 90 days — 6,343,845 — 251,527 Foreign Enel Energía Italy Common Immediate Parent CH$ Other services Less than 90 days 348,370 163,911 — — 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 371,339 379,716 — — 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent CH$ Tolls Less than 90 days 64,484 45,153 — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint Venture CH$ Tolls Less than 90 days 72,965 332,709 — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint Venture CH$ Energy purchase Less than 90 days 70,984 — — — 76.126.507-5 Parque Eólico Talinay Oriente SA Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 65,829 48,434 — — 76.126.507-5 Parque Eólico Talinay Oriente SA Chile Common Immediate Parent CH$ Tolls Less than 90 days 258 301 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent CH$ Other services Less than 90 days — 589,896 — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Other services Less than 90 days 924,051 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent Euros Commodity derivatives Less than 90 days 4,184,469 — — — Foreign Enel Trade S.p.A. Italy Common Immediate Parent CH$ Commodity derivatives Less than 90 days — 1,103,206 — — 76.179.024-2 Parque Eólico Tal S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 2,105,042 2,171,864 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent CH$ Tolls Less than 90 days 484 333 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 10,323,531 7,406,880 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Other services Less than 90 days — 87,448 — — 76.412.562-2 Enel Green Power del Sur SpA Chile Common Immediate Parent CH$ Tolls Less than 90 days 853 42,901 — — 96.920.110-0 Enel Green Power Chile Ltda. Chile Common Immediate Parent CH$ Other services Less than 90 days 90,134 — — — Foreign Enel S.p.A. Italy Parent CH$ Other services Less than 90 days — 120,296 — — Foreign Enel S.p.A. Italy Parent Euros Other services Less than 90 days 77,415 — — — Foreign Enel S.p.A. Italy Parent CH$ Dividends Less than 90 days 63,543,371 — — — Foreign Enel S.p.A. Italy Parent Euros Other services Less than 90 days 1,583,058 564,764 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Other services Less than 90 days — 477 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent CH$ Energy purchase Less than 90 days 1,261,153 — — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent CH$ Other services Less than 90 days — 1,660,149 — — Foreign Enel Italia Servizi SRL Italy Common Immediate Parent Euros Other services Less than 90 days 4,591,580 — — — Foreign Enel Italia Italy Common Immediate Parent Euros Other services Less than 90 days 2,089,122 — — — Foreign Codensa Colombia Common Immediate Parent US$ Other services Less than 90 days 7,936 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent CH$ Other services Less than 90 days 357,579 — — — Foreign Enel Green Power Italia Italy Common Immediate Parent Euros Other services Less than 90 days 99,878 — — — Total 119,612,972 90,428,929 318,518 251,527
Summary of Significant Transactions and Effect on Income or Expenses	c) Significant transactions and effects on income/expenses: Transactions with related companies that are not consolidated and their effects on profit or loss are as follows: } For the years ended December 31, Taxpayer ID Number Company Country Relationship Description of transaction 2017 2016 2015 ThCh$ ThCh$ ThCh$ Foreign Endesa Energía S.A. Spain Common Immediate Parent Other operating income — — 232,867 Foreign Endesa Energía S.A. Spain Common Immediate Parent Gas Sales 10,394,146 18,655,911 14,604,841 Foreign Endesa Energía S.A. Spain Common Immediate Parent Fuel consumption — (134,393 ) (10,451,242 ) Foreign Enel Latonoamérica Spain Common Immediate Parent Interests financial debt — — (18,684 ) Foreign Endesa Generación Spain Common Immediate Parent Fuel consumption — (54,818,466 ) (15,030,911 ) Foreign Endesa Generación Spain Common Immediate Parent Other fixed operating expenses — — (23,329 ) Foreign Endesa Generación Spain Common Immediate Parent Commodity derivatives — — (2,144,063 ) Foreign Generalima S.A.C. Peru Common Immediate Parent Other services rendered — — — Foreign Enel Perú S.A.C Peru Common Immediate Parent Other services rendered 7,405 68,066 — Foreign Enel Perú S.A.C Peru Common Immediate Parent Financial expenses (181 ) — — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other financial expense — — (4,709,312 ) 94.271.000-3 Enel Américas Chile Common Immediate Parent Financial expenses (289,800 ) (1,933,040 ) — 94.271.000-3 Enel Américas Chile Common Immediate Parent Financial income 144,404 540,259 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other services rendered 4,737,522 4,822,344 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other variable expenses — (352 ) — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other operating income — 182,091 — 94.271.000-3 Enel Américas Chile Common Immediate Parent Other fixed operating expenses — (1,546,751 ) — Foreign Codensa S.A. Colombia Common Immediate Parent Other operating income — (709 ) — Foreign Codensa S.A. Colombia Common Immediate Parent Other services rendered 399,432 141,664 — Foreign Enel Brasil Brazil Common Immediate Parent Other fixed operating expenses — (35,949 ) — Foreign Enel Brasil Brazil Common Immediate Parent Other services rendered — 2,044,935 — 76.418.940-k GNL Chile S.A. Chile Associate Gas consumption (146,507,390 ) (102,686,858 ) (123,964,573 ) 76.418.940-k GNL Chile S.A. Chile Associate Gas transportation (47,656,002 ) (40,494,275 ) (52,195,582 ) 76.418.940-k GNL Chile S.A. Chile Associate Other services rendered 85,274 82,762 54,377 76.418.940-k GNL Chile S.A. Chile Associate Other operating income — (1,539 ) 81,749 76.788.080-4 GNL Quintero S.A. Chile Associate Energy sales — 1,912,448 3,260,734 76.788.080-4 GNL Quintero S.A. Chile Associate Electricity tolls — 79,203 151,088 76.788.080-4 GNL Quintero S.A. Chile Associate Other services rendered — 960,390 650,390 Foreign Endesa Cemsa S.A. Argentina Common Immediate Parent Other fixed operating expenses — — (11,862 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Energy purchases (11,758,824 ) (8,803,274 ) (10,597,853 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Electricity tolls (254,065 ) (235,950 ) (294,910 ) 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Other services rendered 415,162 281,190 392,168 96.524.140-K Empresa Eléctrica Panguipulli S.A. Chile Common Immediate Parent Energy sales 1,242,092 116,726 286,977 Foreign Empresa Distribuidora del Sur S.A. Argentina Common Immediate Parent Other services rendered 409,823 398,957 — Foreign Enel Distribución Perú S.A. Peru Common Immediate Parent Other services rendered 176,867 70,415 — Foreign Enel Iberoamérica S.R.L Spain Parent Other fixed operating expenses — — (402,833 ) Foreign Enel Iberoamérica S.R.L Spain Parent Other fixed operating expenses (6,085 ) — — 96.806.130-5 Electrogas S.A. Chile Associate Gas tolls (251,099 ) (2,750,858 ) (3,296,951 ) 96.806.130-5 Electrogas S.A. Chile Associate Fuel consumption (25,025 ) (717,599 ) (952,044 ) Foreign Emgesa S.A.E.S.P Colombia Common Immediate Parent Other operating income 1,866 (2,645 ) — Foreign Enel Argentina S.A. Argentina Common Immediate Parent Other fixed operating expenses — (970 ) — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other services rendered — (96,109 ) — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other operating income 745,818 — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Financial expenses (349 ) — — Foreign Enel Generación Perú S.A. Peru Common Immediate Parent Other operating income — (9,253 ) — Foreign Enel Generacion Piura S.A. Peru Common Immediate Parent Other services rendered 98,421 168,961 — Foreign Enel Generacion Piura S.A. Peru Common Immediate Parent Financial expenses (135 ) — — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Joint venture Electricity tolls (1,383,710 ) (1,291,995 ) (1,473,974 ) 99.573.910-0 Chilectra Inversud S.A. Chile Common Immediate Parent Other operating income — 637 — 76.532.379-7 Chilectra Américas S.A. (*) Chile Common Immediate Parent Other services rendered — 289,994 686,249 76.532.379-7 Chilectra Américas S.A. (*) Chile Common Immediate Parent Other financial expense — (375,037 ) 76.536.351-9 Endesa Américas S.A. (*) Chile Common Immediate Parent Other services rendered — 1,260,448 343,881 Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent Other services rendered 6,629 425,604 1,188,564 Foreign PH Chucas Costa Rica Costa Rica Common Immediate Parent Financial expenses (162,177 ) — — Foreign Compañía Energética Veracruz S.A.C. Peru Common Immediate Parent Other services rendered 283,346 42,890 — Foreign Enel Trade S.p.A Italy Common Immediate Parent Commodity derivatives 19,941,617 — (833,366 ) Foreign Enel Trade S.p.A Italy Common Immediate Parent Other fixed operating expenses — — (216,437 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Energy purchases (4,306,145 ) (3,674,821 ) (3,264,764 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Electricity tolls (212,402 ) (188,859 ) (153,929 ) 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Other services rendered 40,643 152,419 109,891 76.321.458-3 Sociedad Almeyda Solar Spa Chile Common Immediate Parent Energy sales 344,090 64,174 87,062 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Energy purchases (16,630,422 ) (11,992,799 ) (14,929,463 ) 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Other services rendered 101,595 — — 76.052.206-6 Parque Eólico Valle de los Vientos S.A. Chile Common Immediate Parent Energy sales 144,589 558,966 670,035 Foreign Enel SpA Italy Parent Other fixed operating expenses (658,611 ) (34,700 ) — Foreign Enel Italia Servizi Italy Common Immediate Parent Other fixed operating expenses (2,230,668 ) (1,547,695 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Energy purchases (104,865,684 ) (34,952,571 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Energy sales 528,740 48,322 — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Electricity tolls 3,730 (2,323 ) — 76.412.562-2 Enel Green Power del Sur S.p.A Chile Common Immediate Parent Other services rendered 634,361 15 — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Energy purchases (25,959,608 ) (22,415,584 ) (26,456,188 ) 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Electricity tolls 250 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Other services rendered 111,748 — — 76.179.024-2 Parque Eolico Tal Tal S.A. Chile Common Immediate Parent Energy sales 109,643 23,932 217,448 96.920.110-0 Enel Green Power Chile Ltda. Chile Common Immediate Parent Other services rendered 162,848 34,855 — Foreign Enel Produzione Italy Common Immediate Parent Other fixed operating expenses 94,045 — (206,912 ) Foreign Enel Distribuzione Italy Common Immediate Parent Other fixed operating expenses — (654,622 ) — Foreign Enel Energy Europe Italy Common Immediate Parent Other services rendered — — (69,202 ) Foreign Enel Ingegneria e Innovazione Italy Common Immediate Parent Other services rendered — 30,806 35,773 Foreign Enel Ingegneria e Innovazione Italy Common Immediate Parent Other fixed operating expenses — (328,310 ) (1,354,650 ) 76.652.400-1 Centrales Hidroeléctricas de Aysén S.A. Chile Joint venture Other services rendered — — 260,275 Foreign Enel Global Trading S.p.A Italy Common Immediate Parent Other operating income — 9,191,693 — Foreign Enel Global Trading S.p.A Italy Common Immediate Parent Other variable expenses — (2,120,323 ) — Foreign Enel Trading Argentina S.r.L. Argentina Common Immediate Parent Other services rendered 11,488 — — Foreign Enel Green Power Italia Italy Common Immediate Parent Other fixed operating expenses 262,694 — — Foreign Enel Green Power Perù Peru Common Immediate Parent Other services rendered 177,478 — — Foreign Enel Green Power Brasil Brazil Common Immediate Parent Other services rendered 37,936 — — Foreign Enel Green Power Brasil Participacoes LTDA Brazil Common Immediate Parent Other services rendered 9,188 — — Foreign Enel Green Power Mexico Mexico Common Immediate Parent Other services rendered 152,495 — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Energy purchases (456 ) — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Energy sales 10,552 — — 96.971.330-6 Geotérmica del Norte Chile Common Immediate Parent Other services rendered 69,605 — — Foreign Chinango S.A.C Peru Common Immediate Parent Other services rendered 18,516 — — Foreign Enel Green Power Colomboa SAS Colombia Common Immediate Parent Other services rendered 46,557 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Energy sales 128,626 89,710 153,158 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Electricity tolls 144 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Other services rendered 101,595 — — 76.126.507-5 Parque Eólico Talinay Oriente S.A. Chile Common Immediate Parent Energy purchases (539,646 ) (370,964 ) (505,404 ) Total (321,305,504 ) (251,103,769 ) (250,465,948 ) (*) Entities merged with and into Enel Américas S.A.
Summary of Compensation Paid to Members of the Board of Directors	The following tables show details of the compensation paid to the members of the Board of Directors of the Company for the year ended December 31, 2017: December 31, 2017 Enel Chile Board Board of subsidiaries Directors' Committee Taxpayer ID No. Name Position Period in position ThCh$ ThCh$ ThCh$ 4.975.992-4 Hermán Chadwick Piñera Chairman January - December 2017 178,065 — — Foreigner Giulio Fazio Vice Chairman January - December 2017 — — — 4.461.192-9 Fernán Gazmuri Plaza Director January - December 2017 89,032 — 28,504 4.774.797-K Pedro Pablo Cabrera Gaete Director January - December 2017 89,032 — 28,504 5.672.444-3 Juan Gerardo Jofré Miranda Director January - December 2017 89,032 — 28,504 Foreigner Vicenzo Ranieri Director January - December 2017 — — — Foreigner Salvatore Bernabei Director January - December 2017 — — — Total 445,161 — 85,512 December 31, 2016 Enel Chile Board Board of subsidiaries Directors' Committee Taxpayer ID No. Name Position Period in position ThCh$ ThCh$ ThCh$ 4.975.992-4 Hermán Chadwick Piñera Chairman March - December 2016 129,578 — — Foreigner Giulio Fazio Vice Chairman March - December 2016 — — — 4.461.192-9 Fernán Gazmuri Plaza Director March - December 2016 80,864 — 25,250 4.774.797-K Pedro Pablo Cabrera Gaete Director March - December 2016 80,864 — 25,250 5.672.444-3 Juan Gerardo Jofré Miranda Director March - December 2016 80,864 — 25,250 Foreigner Vicenzo Ranieri Director March - December 2016 — — — Foreigner Salvatore Bernabei Director March - December 2016 — — — Total 372,170 — 75,750
Disclosure Of Compensation Of Key Management Personnel Explanatory	a) Compensation received by key management personnel Key Management Personnel Taxpayer ID No. Name Position Foreigner Nicola Cotugno (1) Chief Executive Officer 24.950.967-1 Raffaele Grandi Administration, Finance and Control Officer 15.307.846-7 Jose Miranda Montecinos Communications Officer 24.166.243-8 Alain Rosolino (2) Human Resources and Organization Officer 6.973.465-0 Domingo Valdés Prieto General Counsel and Secretary to the Board Foreigner Raffael Cutrignelli (3) Internal Audit Officer 11.625.161-2 Pedro Urzúa Frei Institutional Relations Officer Foreigner Bruno Stella (4) Planning and control Officer 7.006.337-9 Francisco Silva Bafalluy Services Officer 13.686.119-0 Andrés Pinto Bonta (5) Security Officer 23.819.804-6 Antonella Pellegrini (5) Sustainability and community relations Officer 25.629.782-5 Monica de Martino (5) Regulation Officer (1) On August 16, 2016, Mr. Nicola Cotugno became CEO replacing Mr. Luca D’Agnese who submitted his voluntarily resignation from the Company, and served until that date. (2) On October 1, 2016, Mr. Alain Rosolino became Human Resources and Organization Officer replacing Ms. Paola Visintini Vacarezza. (3) On October 1, 2016, Mr. Raffaele Cutrignelli became Internal Audit Officer replacing Mr. Alain Rosolino. (4) On January 23, 2017, Mr. Bruno Stella became Planning and Control Manager. (5) These position were assumed on May 31, 2017.
Summary of Compensation Received by Key Management Personnel	Compensation received by key management personnel is the following: December 31, 2017 December 31, 2016 ThCh$ ThCh$ Cash compensation 2,959,467 1,486,703 Short-term benefits for employees 557,122 341,203 Other long-term benefits 183,453 295,321 Total 3,700,042 2,123,227

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Classes Of Inventories [Abstract]
Summary of Classes of Inventories	The detail of inventories as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Classes of Inventories ThCh$ ThCh$ Supplies for Production 16,879,260 12,377,179 Gas 2,301,172 2,159,901 Oil 2,593,806 2,556,438 Coal 11,984,282 7,660,840 Other inventories (*) 22,807,682 25,162,417 Total 39,686,942 37,539,596 (*) Other inventories 22,807,682 25,162,417 Supplies for projects and spare parts 12,311,718 17,076,698 Electrical materials 10,495,964 8,085,719

Current Tax Assets and Liabil60

Current Tax Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Current Tax Assets And Liabilities [Abstract]
Summary of Current Tax Assets and Liabilities	The detail of current tax assets and liabilities as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Tax Receivables ThCh$ ThCh$ Monthly provisional tax payments 63,942,847 43,862,763 Tax credit for absorbed profits 13,433,962 11,398,609 Tax credit for training expenses 261,000 241,700 Other 118,239 146,099 Total 77,756,048 55,649,171 As of December 31, 2017 2016 Tax Payables ThCh$ ThCh$ Income tax 67,027,507 61,599,415 Total 67,027,507 61,599,415

Investments Accounted for Usi61

Investments Accounted for Using the Equity Method (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Investments Accounted For Using Equity Method [Abstract]
Summary of Changes in Investments in Associates and Joint Ventures Accounted For Using the Equity Method	a. The following tables present the changes in investments in associates and joint ventures accounted for using the equity method as of December 31, 2017 and 2016: Balance as of Share of Profit Dividends Foreign Currency Other Comprehensive Other Increase Balance as of Taxpayer ID Number Associates and Joint Ventures Country Currency Ownership Interest 01-01-2017 ThCh$ Additions ThCh$ (Loss) ThCh$ Declared ThCh$ Translation ThCh$ Income ThCh$ (Decrease) ThCh$ 12-31-2017 ThCh$ 76.418.940-K GNL Chile S.A. Chile U.S. dollar 33.33 % 3,982,934 — 841,957 (743,734 ) (297,841 ) — — 3,783,316 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. (*) Chile Chilean peso 51.00 % 6,441,166 1,943,100 (4,179,033 ) — — — (4,205,233 ) — 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Chilean peso 50.00 % 8,222,763 — 595,996 — — — — 8,818,759 Foreign Enel Argentina S.A. Argentina Argentine peso 0.12 % 91,335 — 44,176 — (29,198 ) (1,490 ) 323 105,146 TOTAL 18,738,198 1,943,100 (2,696,904 ) (743,734 ) (327,039 ) (1,490 ) (4,204,910 ) 12,707,221 Balance as of Share of Profit Dividends Foreign Currency Other Comprehensive Other Increase Balance as of Taxpayer ID Number Associates and Joint Ventures Country Currency Ownership Interest 01-01-2016 ThCh$ Additions ThCh$ (Loss) ThCh$ Declared ThCh$ Translation ThCh$ Income ThCh$ (Decrease) ThCh$ 12-31-2016 ThCh$ 96.806.130-5 Electrogas S.A. (*) Chile U.S. dollar 42.50 % 12,042,873 — 5,166,226 (3,979,095 ) (844,372 ) 607,375 (12,993,007 ) — 76.788.080-4 GNL Quintero S.A. (**) Chile U.S. dollar 20.00 % 17,137,023 — 2,750,075 (2,598,035 ) (816,094 ) (12,298,165 ) (4,174,804 ) — 76.418.940-K GNL Chile S.A. Chile U.S. dollar 33.33 % 2,662,029 — 1,491,025 — (170,120 ) — — 3,982,934 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. Chile Chilean peso 51.00 % 6,280,293 2,346,000 (2,185,127 ) — — — — 6,441,166 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chile Chilean peso 50.00 % 7,594,153 — 628,610 — — — — 8,222,763 Foreign Enel Argentina S.A. Argentina Argentine peso 0.12 % — 235,090 23,610 — (21,044 ) (656 ) (145,665 ) 91,335 Foreign Southern Cone S.A. Argentina Argentine peso 2.00 % — 3,326 3,780 — (1,080 ) (63 ) (5,963 ) — TOTAL 45,716,371 2,584,416 7,878,199 (6,577,130 ) (1,852,710 ) (11,691,509 ) (17,319,439 ) 18,738,198 (*) See Note 5. (**) See Note 12.1.b.
Summary of Financial Information from Financial Statements of Investments in Associates	The following tables show financial information as of December 31, 2017 and 2016, from the financial statements of the investments in associates where the Group has significant influence: As of December 31, 2017 % Ownership Interest Current Assets Non-current Assets Current Liabilities Non-current Liabilities Revenues Expenses Profit (Loss) Other Comprehensive Income Comprehensive Income Investments with Significant Influence Indirect ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GNL Chile S.A 33.33 % 71,254,956 148,950 60,052,823 — 687,399,254 (684,873,130 ) 2,526,124 (24,472 ) 2,501,652 As of December 31, 2016 % Ownership Interest Current Assets Non-current Assets Current Liabilities Non-current Liabilities Revenues Expenses Profit (Loss) Other Comprehensive Income Comprehensive Income Investments with Significant Influence Indirect ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GNL Chile S.A 33.33 % 90,283,944 117,703 78,452,153 — 615,229,994 (610,756,322 ) 4,473,672 (510,406 ) 3,963,266 GNL Quintero S.A. 20.00 % — — — — 86,471,706 (72,752,059 ) 13,719,647 (65,571,292 ) (51,851,645 ) Electrogas S.A. 42.50 % 9,318,456 40,746,438 5,683,680 13,809,430 24,126,070 (11,970,244 ) 12,155,826 (347,369 ) 11,808,457
Summary of Financial Information from Financial Statements of Main Joint Ventures	The following tables present information from the financial statements as of December 31, 2017 and 2016, on the main joint ventures: Centrales Hidroeléctricas Transmisora Eléctrica de Aysén S.A. de Quillota Ltda. 51.0% 51.0% 50.0% 50.0% 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Financial statement items ThCh$ ThCh$ ThCh$ ThCh$ Total current assets 355,835 863,962 7,793,702 6,366,378 Total non-current assets 8,030,172 15,159,321 12,036,201 12,034,576 Total current liabilities 139,182 3,324,706 440,426 245,025 Total non-current liabilities — 68,081 1,751,963 1,710,406 Cash and cash equivalents 355,446 860,719 7,310,296 5,716,196 Revenues — — 2,813,493 2,774,316 Other fixed operating expenses (8,144,855 ) (4,363,197 ) (525,471 ) — Depreciation and amortization expense — — (782,322 ) (773,093 ) Interest income 24,829 42,046 — 134,995 Income tax expense — (7,070 ) (313,709 ) (225,008 ) Profit (loss) (8,193,671 ) (4,284,131 ) 1,191,991 1,257,220 Other comprehensive income — — — — Comprehensive income (8,193,671 ) (4,284,131 ) 1,191,991 1,257,220

Intangible Assets Other than 62

Intangible Assets Other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Intangible Assets [Abstract]
Summary of Intangible Assets	The following table presents intangible assets as of December 31, 2017 and 2016: As of December 31, 2017 2016 Intangible Assets, Net ThCh$ ThCh$ Intangible Assets, Net 55,170,904 44,470,750 Easements and water rights 12,608,950 12,564,076 Computer software 38,254,793 27,591,694 Other identifiable intangible assets 4,307,161 4,314,980 2017 2016 Intangible Assets, Gross ThCh$ ThCh$ Intangible Assets, Gross 118,593,240 101,092,918 Easements and water rights 14,598,701 14,553,826 Computer software 93,260,355 75,793,919 Other identifiable intangible assets 10,734,184 10,745,173 2017 2016 Intangible Assets, Amortization and Impairment ThCh$ ThCh$ Accumulated Amortization and Impairment, Total (63,422,336 ) (56,622,168 ) Easements and water rights (1,989,751 ) (1,989,750 ) Computer software (55,005,562 ) (48,202,225 ) Other identifiable intangible assets (6,427,023 ) (6,430,193 )
Summary of Reconciliations of the Carrying Amounts of Intangible Assets	The reconciliations of the carrying amounts of intangible assets at December 31, 2017 and 2016 are as follows: Easements Computer Software Other Intangibles Assets, Net Changes in Intangible Assets ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2017 12,564,076 27,591,694 4,314,980 44,470,750 Changes in identifiable intangible assets Increases (decreases) other than from business combinations 295,588 17,466,436 — 17,762,024 Increase (decrease) from exchange differences, net — — (115 ) (115 ) Amortization (1) — (6,803,337 ) (7,704 ) (6,811,041 ) Increases (decreases) from transfers and other changes (250,714 ) — — (250,714 ) Increases (decreases) from transfers (250,714 ) — — (250,714 ) Total changes in identifiable intangible assets 44,874 10,663,099 (7,819 ) 10,700,154 Closing balance December 31, 2017 12,608,950 38,254,793 4,307,161 55,170,904 Easements Computer Software Other Intangibles Assets, Net Changes in Intangible Assets ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2016 14,575,473 27,824,092 479,761 42,879,326 Changes in identifiable intangible assets Increases (decreases) other than from business combinations 540,052 5,690,091 3,851,635 10,081,778 Increase (decrease) from exchange differences, net — — 2,897 2,897 Amortization (1) — (5,815,030 ) (18,961 ) (5,833,991 ) Increases (decreases) from transfers and other changes 352 — (352 ) — Increases (decreases) from transfers 352 — (352 ) — Increases (decreases) from other changes — — — — Disposals and removals from service (2,549,926 ) — — (2,549,926 ) Disposals (2,549,926 ) — — (2,549,926 ) Removals from service — — — — Other increases (decreases) (1,875 ) (107,459 ) — (109,334 ) Total changes in identifiable intangible assets (2,011,397 ) (232,398 ) 3,835,219 1,591,424 Closing balance December 31, 2016 12,564,076 27,591,694 4,314,980 44,470,750 (1) See Note 28. (2) See Note 15.e).ix)

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Goodwill [Abstract]
Summary of Goodwill by the Cash-Generating Unit or Group of Cash-Generating Units	The following table shows goodwill by the Cash-Generating Unit or group of Cash-Generating Units to which it belongs and changes as of December 31, 2017 and 2016: Opening Balance 01-01-2016 Increase/ (Decrease) Closing 12/31/2016 Increase/ (Decrease) Closing Balance 12/31/2017 Company Cash Generating Unit ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Empresa Eléctrica de Colina Ltda. Empresa 2,240,478 — 2,240,478 — 2,240,478 Compañía Eléctrica Tarapacá S.A. (1) Enel Generación Chile 4,656,105 (4,656,105 ) — — — Enel Distribución Chile S.A. Enel Distribución Chile 128,374,362 — 128,374,362 — 128,374,362 Enel Generación Chile S.A. Enel Generación Chile 731,782,459 — 731,782,459 — 731,782,459 GasAtacama Chile (1) Enel Generación Chile 20,204,251 4,656,105 24,860,356 — 24,860,356 Total 887,257,655 — 887,257,655 — 887,257,655 (1) On November 1, 2016, Compañía Eléctrica Tarapacá S.A. was merged with GasAtacama S.A., the latter being the surviving company.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Property Plant And Equipment [Abstract]
Summary of Property Plant and Equipment	The following table shows property, plant and equipment as of December 31, 2017 and 2016: As of December 31, 2017 2016 Classes of Property, Plant and Equipment, Net ThCh$ ThCh$ Property, Plant and Equipment, Net 3,585,687,137 3,476,128,634 Construction in progress 666,590,543 688,387,124 Land 67,485,380 66,868,119 Buildings 12,793,641 13,020,474 Generation Plant and equipment 2,080,903,064 2,033,720,809 Network infrastructure 683,120,815 613,443,219 Fixtures and fittings 56,284,762 41,325,699 Other property, plant and equipment under financial lease 18,508,932 19,363,190 2017 2016 Classes of Property, Plant and Equipment, Gross ThCh$ ThCh$ Property, Plant and Equipment, Gross 6,726,796,186 6,471,364,618 Construction in progress 666,590,543 688,387,124 Land 67,485,380 66,868,119 Buildings 28,382,234 27,891,216 Generation Plant and equipment 4,636,175,749 4,481,701,141 Network infrastructure 1,151,951,280 1,050,212,442 Fixtures and fittings 147,450,968 127,544,544 Other property, plant and equipment under financial lease 28,760,032 28,760,032 Classes of Accumulated Depreciation and Impairment in Property, Plant 2017 2016 and Equipment ThCh$ ThCh$ Total Accumulated Depreciation and Impairment in Property, Plant and Equipment (3,141,109,049 ) (2,995,235,984 ) Buildings (15,588,593 ) (14,870,742 ) Generation Plant and equipment (2,555,272,685 ) (2,447,980,332 ) Network infrastructure (468,830,465 ) (436,769,223 ) Fixtures and fittings (91,166,206 ) (86,218,845 ) Other property, plant and equipment under financial lease (10,251,100 ) (9,396,842 )
Summary of Changes in Property Plant and Equipment	The detail and changes in property, plant, and equipment at December 31, 2017 and 2016, are as follows: Construction in Land Buildings Generation Plant and Equipment Network infrastructure Fixtures and Fittings Other Property, Plant and Equipment under Financial Lease Property, Plant and Equipment, Net Changes in 2017 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2017 688,387,124 66,868,119 13,020,474 2,033,720,809 613,443,219 41,325,699 19,363,190 3,476,128,634 Changes: Increases other than from business combinations 281,007,995 — — — — 2,811,255 — 283,819,250 Increases (decreases) from exchange differences, net (101,444 ) (25,624 ) (44,699 ) (336,622 ) — (83,651 ) — (592,040 ) Depreciation (1) (3) — — (717,851 ) (107,292,353 ) (32,061,242 ) (4,947,361 ) (854,258 ) (145,873,065 ) Increases (decreases) from transfers and other changes (273,509,759 ) 776,933 439,284 155,711,630 99,419,024 17,162,888 — — Increases (decreases) for transfers (273,509,759 ) 776,933 439,284 155,711,630 99,419,024 17,162,888 — — Disposals and removals from service (30,255,180 ) (31,447 ) (154,623 ) (1,704,924 ) (1,023,777 ) 15,932 — (33,154,019 ) Disposals (5,099,800 ) (31,447 ) — (435,327 ) (18,555 ) 38,212 — (5,546,917 ) Removals from service (25,155,380 ) — (154,623 ) (1,269,597 ) (1,005,222 ) (22,280 ) — (27,607,102 ) Other increases (decreases) 1,061,807 (102,601 ) 251,056 804,524 3,343,591 — — 5,358,377 Total changes (21,796,581 ) 617,261 (226,833 ) 47,182,255 69,677,596 14,959,063 (854,258 ) 109,558,503 Closing balance December 31, 2017 666,590,543 67,485,380 12,793,641 2,080,903,064 683,120,815 56,284,762 18,508,932 3,585,687,137 Construction in progress Land Buildings Generation Plant and Equipment Network infrastructure Fixtures and Fittings Other Property, Plant and Equipment under Financial Lease Property, Plant and Equipment, Net Changes in 2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Opening balance January 1, 2016 636,148,748 66,900,933 13,481,093 2,072,402,503 589,334,703 20,716,643 20,075,072 3,419,059,695 Changes: Increases other than from business combinations 244,473,325 — 24,934 — 1,443,508 3,126,834 — 249,068,601 Increases (decreases) from exchange differences, net (37,543 ) (6,591 ) (11,711 ) (59,516 ) — (33,227 ) — (148,588 ) Depreciation (1) — — (620,865 ) (99,397,373 ) (25,187,344 ) (4,497,175 ) (711,882 ) (130,414,639 ) Impairment losses recognized in profit or loss (2) (30,785,531 ) — — — — — — (30,785,531 ) Increases (decreases) from transfers and other changes (128,045,183 ) 104,268 147,023 60,822,509 48,308,750 22,123,585 — 3,460,952 Increases (decreases) for transfers (127,694,878 ) 104,268 147,023 55,464,141 48,308,750 23,670,696 — — Increases (decreases) from transfers from constructions in progress (127,694,878 ) 104,268 147,023 55,464,141 48,308,750 23,670,696 — — Increases (decreases) from other changes (350,305 ) — — 5,358,368 — (1,547,111 ) — 3,460,952 Disposals and removals from service (33,366,692 ) (130,491 ) — (47,314 ) (456,398 ) (110,961 ) — (34,111,856 ) Disposals — — — — — — — — Removals from service (33,366,692 ) (130,491 ) — (47,314 ) (456,398 ) (110,961 ) — (34,111,856 ) Other increases (decreases) — — — 1,753,884 — — 3,416,059,695 Total changes 52,238,376 (32,814 ) (460,619 ) (38,681,694 ) 24,108,516 20,609,056 (711,882 ) 57,068,939 Closing balance December 31, 2016 688,387,124 66,868,119 13,020,474 2,033,720,809 613,443,219 41,325,699 19,363,190 3,476,128,634
Schedule of Minimum Lease Payments Receivable	The present value of future lease payments derived from these finance leases is as follows: As of December 31, 2017 2016 Gross Interest Present Value Gross Interest Present Value ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Less than one year 2,459,000 659,212 1,799,788 2,677,881 837,514 1,840,367 From one to five years 9,836,000 1,244,808 8,591,192 10,711,519 1,763,190 8,948,329 More than five years 4,377,544 159,610 4,217,934 7,445,079 484,128 6,960,951 Total 16,672,544 2,063,630 14,608,914 20,834,479 3,084,832 17,749,647
Disclosure Of Future Minimum Lease Payments Under Finance Leases Explanatory	As of December 31, 2017 and 2016, the total future lease payments under those contracts are as follows: As of December 31, 2017 2016 ThCh$ ThCh$ Less than one year 4,622,605 7,133,186 From one to five years 9,006,627 11,998,147 More than five years 1,345,183 9,015,356 Total 14,974,415 28,146,689

Investment Property (Tables)

Investment Property (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Investment Property [Abstract]
Summary of Changes in Investment Property	The detail and changes in investment property during the years ended December 31, 2017 and 2016, are as follows: Investment Properties, Accumulated Depreciation, Amortization and Impairment Investment Properties, Net Investment Properties ThCh$ ThCh$ ThCh$ Balance at January 1, 2016 8,938,662 (787,675 ) 8,150,987 Depreciation expense — (22,465 ) (22,465 ) Balance at December 31, 2016 8,938,662 (810,140 ) 8,128,522 Depreciation expense — (22,465 ) (22,465 ) Other increases (decreases) 250,715 — 250,715 Balance at December 31, 2017 9,189,377 (832,605 ) 8,356,772
Summary of Income and Expenses from Investment Properties	For the years ended December 31, 2017, 2016 and 2015, the detail of income and expenses from investment properties is as follows: For the years ended December 31, 2017 2016 2015 Income and expense from investment properties ThCh$ ThCh$ ThCh$ Rental income from investment properties 192,719 167,429 163,660 Income from the sale of investment properties (*) — — 1,800,933 Direct operating expense from investment properties generating rental income (78,367 ) (71,339 ) (163,767 ) Direct operating expense from investment properties not generating rental income (*) — — (337,770 ) Total 114,352 96,090 1,463,056 (*) See Note 3.h.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Income Taxes [Abstract]
Components of Income Tax Expense Benefit	The following table presents the components of the income tax expense / (benefit) for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Current Income Tax and Adjustments to Current Income Tax for Previous Periods ThCh$ ThCh$ ThCh$ Current income tax (162,820,181 ) (162,033,295 ) (84,003,064 ) Adjustments to current tax from the previous period (1,127,646 ) (710,740 ) (7,307,511 ) Other current tax benefit / (expense) 15,934,106 21,380,071 (34,995,137 ) Current tax expense, net (148,013,721 ) (141,363,964 ) (126,305,712 ) Benefit / (expense) from deferred taxes for origination and reversal of temporary differences 4,671,420 29,960,782 16,693,113 Total deferred tax benefit / (expense) 4,671,420 29,960,782 16,693,113 Income tax expense (143,342,301 ) (111,403,182 ) (109,612,599 )
Summary of Reconciliation of Tax Expense	The following table reconciles income taxes resulting from applying the local current tax rate to “Net income before taxes” and the actual income tax expense recorded in the accompanying Consolidated Statement of Comprehensive Income for the years ended December 31, 2017, 2016 and 2015: 12-31-2017 12-31-2016 12-31-2015 Reconciliation of Tax Expense Rate ThCh$ Rate ThCh$ Rate ThCh$ ACCOUNTING INCOME BEFORE TAX 666,760,212 676,674,298 456,580,763 Total tax income (expense) using statutory rate (25.50 %) (170,023,854 ) (24.00 %) (162,401,830 ) (22.50 %) (102,730,671 ) Tax effect of rates applied in other countries 0.05 % 328,968 Tax effect of non-taxable revenues 5.67 % 37,774,743 6.53 % 44,163,296 2.12 % 9,674,087 Tax effect of non-tax-deductible expenses (3.11 %) (20,737,858 ) (2.13 %) (14,392,926 ) (4.61 %) (21,060,811 ) Tax effect of adjustments to taxes in previous periods (0.17 %) (1,127,646 ) (0.11 %) (710,740 ) (1.60 %) (7,307,511 ) Price level restatement for tax purposes (investments and equity) 1.57 % 10,443,346 3.24 % 21,939,018 2.58 % 11,812,307 Total adjustments to tax expense using statutory rate 4.00 % 26,681,553 7.53 % 50,998,648 (1.51 %) (6,881,928 ) Income tax benefit (expense) (21.50 %) (143,342,301 ) (16.47 %) (111,403,182 ) (24.01 %) (109,612,599 )
Summary of Origination and Changes in Deferred Tax Assets and Liabilities	The origination and changes in deferred tax assets and liabilities as of December 31, 2017 and 2016, are as follows: December 31, 2017 December 31, 2016 Assets Liabilities Assets Liabilities Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation 162,315 (263,847,598 ) 5,465,105 (246,373,416 ) Provisions 39,890,472 — 36,785,893 (342,283 ) Post-employment benefit obligations 6,336,920 (364,925 ) 6,795,806 (579,978 ) Tax loss carryforwards 9,536,102 — 11,911,396 — Other 49,635,500 (10,734,675 ) 21,979,742 (13,210,542 ) Deferred Tax Assets/Liabilities before compensation 105,561,309 (274,947,198 ) 82,937,942 (260,506,219 ) Compensation of Assets (Liabilities) for deferred taxes (102,723,517 ) 102,723,517 (61,141,425 ) 61,141,425 Deferred Tax Assets (Liabilities) after compensation 2,837,792 (172,223,681 ) 21,796,517 (199,364,794 ) Opening balance January 1, 2017 Changes 2017 Closing balance December 31, 2017 Increase (decrease) in profit or loss Increase (decrease) in other comprehensive income Recognized directly in equity Foreign currency translation Transfers to (from) Noncurrent Assets and Groups in Dispossession held for sale Other increases (decreases) Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation (240,908,311 ) (22,836,691 ) — — 61,222 — (1,503 ) (263,685,283 ) Provisions 36,443,610 2,940,867 — — — — 505,995 39,890,472 Post-employment benefit obligations 6,215,828 976,808 (463,556 ) — — — (757,085 ) 5,971,995 Tax loss carryforwards 11,911,396 (2,375,294 ) — — — — — 9,536,102 Other (1) 8,769,200 25,965,730 (497 ) — (28,356 ) — 4,194,748 38,900,825 Deferred Tax Assets (Liabilities) (177,568,277 ) 4,671,420 (464,053 ) — 32,866 — 3,942,155 (169,385,889 ) Opening balance January 1, 2016 Changes 2016 Closing balance December 31, 2016 Increase (decrease) in profit or loss Increase (decrease) in other comprehensive income Recognized directly in equity Foreign currency translation Transfers to (from) Noncurrent Assets and Groups in Dispossession held for sale Other increases (decreases) Deferred Tax Assets (Liabilities) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Accumulated depreciation (265,258,085 ) 24,331,401 — — 15,488 — 2,885 (240,908,311 ) Provisions 33,240,241 3,203,369 — — — (62,749 ) 62,749 36,443,610 Post-employment benefit obligations 5,236,522 (807,693 ) 1,786,999 — — 21,853 (21,853 ) 6,215,828 Tax loss carryforwards 12,084,821 (173,368 ) — — — — (57 ) 11,911,396 Other 43,365,996 756,651 1,822 (30,829,099 ) 12,645 — (4,538,815 ) 8,769,200 Deferred Tax Assets (Liabilities) (171,330,505 ) 27,310,360 1,788,821 (30,829,099 ) 28,133 (40,896 ) (4,495,091 ) (177,568,277 ) (1) Deferred taxes recognized in increase (decrease) in profit and loss are mainly the related to recognition of tax on the investment in Hidroaysen, which has been classified as non-current assets held for distribution to the owners.
Effects of Deferred Tax on Components of Other Comprehensive Income	The effects of deferred tax on the components of other comprehensive income for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Effects of Deferred Tax on the Components of Amount Tax Income Tax Expense (Benefit) Amount After Tax Amount Before Tax Income Tax Expense (Benefit) Amount After Tax Amount Before Tax Income Tax Expense (Benefit) Amount After Tax Other Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Available-for-sale financial assets 1,840 (497 ) 1,343 (6,740 ) 1,820 (4,920 ) 1,077 (290 ) 787 Cash flow hedge 97,558,961 (25,701,599 ) 71,857,362 89,068,357 (21,116,232 ) 67,952,125 (122,593,576 ) 31,868,299 (90,725,277 ) Share of other comprehensive income from associates and joint ventures accounted for using the equity method (1,490 ) — (1,490 ) (11,691,075 ) — (11,691,075 ) (577,862 ) — (577,862 ) Foreign currency translation (3,686,549 ) — (3,686,549 ) (3,532,844 ) — (3,532,844 ) 162,373 — 162,373 Actuarial gains(losses) on defined-benefit pension plans 1,716,875 (463,556 ) 1,253,319 (6,618,514 ) 1,786,999 (4,831,515 ) (5,645,532 ) 1,325,242 (4,320,290 ) Income tax related to components of other comprehensive income 95,589,637 (26,165,652 ) 69,423,985 67,219,184 (19,327,413 ) 47,891,771 (128,653,520 ) 33,193,251 (95,460,269 )
Movements in Deferred Taxes for Components of Other Comprehensive Income	The movements in deferred taxes for the components of other comprehensive income as of December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Reconciliation of changes in deferred taxes of components of other comprehensive income ThCh$ ThCh$ ThCh$ Total increases (decreases) for deferred taxes of other comprehensive income from continuing operations (497 ) 1,788,821 1,724,427 Income tax of changes in cash flow hedge transactions (25,701,599 ) (21,116,234 ) 31,468,824 Total income tax relating to components of other comprehensive income (25,702,096 ) (19,327,413 ) 33,193,251

Other Financial Liabilities (Ta

Other Financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Liabilities [Abstract]
Schedule of Balances of Other Financial Liabilities	The balances of other financial liabilities as of December 31, 2017 and 2016, are as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Other financial liabilities ThCh$ ThCh$ ThCh$ ThCh$ Interest –bearing borrowings 17,255,692 760,932,929 18,013,114 802,046,968 Hedging derivatives (*) 304,278 21,045,216 313,571 48,981,953 Non-hedging derivatives (**) 1,255,478 — 7,369,481 2,987,830 Total 18,815,448 781,978,145 25,696,166 854,016,751 (*) See Note 20.2.a (**) See Note 20.2.b
Schedule of Interest-bearing Borrowings	The detail of current and non-current interest-bearing borrowings as of December 31, 2017 and 2016, is as follows: As of December 31, 2017 2016 Current Non-current Current Non-current Classes of Interest-bearing borrowings ThCh$ ThCh$ ThCh$ ThCh$ Bank loans 122 — 4,274 — Unsecured obligations 15,455,782 748,123,803 16,168,473 786,137,688 Financial leases 1,799,788 12,809,126 1,840,367 15,909,280 Total 17,255,692 760,932,929 18,013,114 802,046,968
Summary of Bank Loans by Currency and Maturity	Bank loans by currency and contractual maturity as of December 31, 2017 and 2016, are as follows: Summary of bank loans by currency and maturity Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 122 — 122 — — — — — — Total 122 — 122 — — — — — — Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 4,274 — 4,274 — — — — — — Total 4,274 — 4,274 — — — — — —
Summary of Identification of Bank Borrowings by Company	Identification of bank borrowings by company Appendix No.4, letter a), presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the bank loans detailed above. December 31, 2017 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 2,037 — 2,037 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 2,135 — 2,135 — — — — — — Total 4,274 — 4,274 — — — — — —
Summary of Unsecured Liabilities by Currency and Maturity	The detail of Unsecured Liabilities by currency and maturity as of December 31, 2017 and 2016, is as follows: Summary of unsecured liabilities by currency and maturity Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,322,081 2,206,269 8,528,350 — — — — 430,228,859 430,228,859 Chile U.F. 6.00% 5.48% Unsecured — 6,927,432 6,927,432 5,574,013 5,574,013 5,574,013 5,574,013 295,598,892 317,894,944 Total 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2015 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,884,819 2,402,653 9,287,472 — — — — 468,578,474 468,578,474 Chile U.F. 6.00% 5.48% Unsecured — 6,881,001 6,881,001 5,480,380 5,480,380 5,480,380 5,480,380 295,637,694 317,559,214 Total 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688
Summary of Unsecured Liabilities by Company	Identification of unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,152,926 — 4,152,926 — — — — 125,566,611 125,566,611 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,328,023 — 1,328,023 — — — — 42,902,198 42,902,198 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 841,132 — 841,132 — — — — 19,398,499 19,398,499 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,206,269 2,206,269 — — — — 242,361,551 242,361,551 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,374,051 6,374,051 5,574,013 5,574,013 5,574,013 5,574,013 30,872,536 53,168,588 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% No — 553,381 553,381 — — — — 264,726,356 264,726,356 Total Unsecured Bonds 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 December 31, 2016 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,522,585 — 4,522,585 — — — — 136,759,395 136,759,395 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,446,232 — 1,446,232 — — — — 46,792,429 46,792,429 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 916,002 — 916,002 — — — — 21,608,757 21,608,757 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,402,653 2,402,653 — — — — 263,417,893 263,417,893 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,337,021 6,337,021 5,480,380 5,480,380 5,480,380 5,480,380 35,587,764 57,509,284 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M (*) Chile U.F. 4.82% 4.75% No — 543,980 543,980 — — — — 260,049,930 260,049,930 Total Unsecured Bonds 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688
Summary of Detail of Finance Lease Obligations	18.4 Appendix No. 4 letter c) presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the finance lease obligations detailed above. December 31, 2017 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 Total Leasing 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 December 31, 2016 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 Total Leasing 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280
Summary of Changes in Reserve for Cash Flow Hedges	The following table details changes in “Reserve for cash flow hedges” as of December 31, 2017, 2016 and 2015, due to exchange differences of this debt: For the years ended December 31, 2017 2016 2015 ThCh$ ThCh$ ThCh$ Balance in hedging reserves (hedging income) at the beginning of the period, net (52,747,646 ) (74,953,393 ) (39,805,098 ) Foreign currency exchange differences recognized in equity, net 17,321,594 14,317,257 (38,579,730 ) Foreign currency exchange differences recognized in profit and loss, net 8,258,044 7,888,490 3,431,435 Balance in hedging reserves (hedging income) at the end of the period, net (27,168,008 ) (52,747,646 ) (74,953,393 )

Risk Management Policy (Tables)

Risk Management Policy (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Abstract]
Comparative Structure of Financial Debt According to Fixed and /or Protected Interest Rate on Gross Debt	The comparative structure of the financial debt of the Enel Chile Group according to the fixed and / or protected interest rate on the gross debt, after derivatives contracted, is as follows: Gross position: For the years ended December 31, 2017 2016 % % Fixed interest rate 92% 92% Total 92% 92%

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Instruments [Abstract]
Summary of Financial Assets Classified by Type and Category	a) The detail of financial assets, classified by type and category, as of December 31, 2017 and 2016, is as follows: December 31, 2017 Financial assets held for trading (*) Held-to-maturity investments (*) Loans and receivables Available-for-sale financial assets Financial derivatives for hedging ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Derivative instruments 402,716 — — — 20,038,433 Other financial assets — 185,913 478,880,650 — — Total Current 402,716 185,913 478,880,650 — 20,038,433 Equity instruments — — — 2,628,501 — Derivative instruments — — — — 30,789,703 Other financial assets — — 36,182,399 — — Total Non-current — — 36,182,399 2,628,501 30,789,703 Total 402,716 185,913 515,063,049 2,628,501 50,828,136 December 31, 2016 Financial assets held for trading (*) Held-to-maturity investments (*) Loans and receivables Available-for-sale financial assets Financial derivatives for hedging ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Derivative instruments — — — — 121,443 Other financial assets — 462,801 464,235,411 — — Total Current — 462,801 464,235,411 — 121,443 Equity instruments — — — 2,641,620 — Derivative instruments — — — — 25,533,189 Other financial assets — 652,733 33,500,105 — — Total Non-current — 652,733 33,500,105 2,641,620 25,533,189 Total — 1,115,534 497,735,516 2,641,620 25,654,632 (*) See note 7.
Summary of Financial Liabilities Classified by Type and Category	b) The detail of financial liabilities, classified by type and category, as of December 31, 2017 and 2016, is as follows: December 31, 2017 Financial liabilities held for trading Loans and payables Financial derivatives for hedging ThCh$ ThCh$ ThCh$ Interest-bearing loans — 17,255,692 — Derivative instruments 1,255,478 — 304,278 Other financial liabilities — 670,642,077 — Total Current 1,255,478 687,897,769 304,278 Interest-bearing loans — 760,932,929 — Derivative instruments — — 21,045,216 Other financial liabilities — 978,342 — Total Non-current — 761,911,271 21,045,216 Total 1,255,478 1,449,809,040 21,349,494 December 31, 2016 Financial liabilities held for trading Loans and payables Financial derivatives for hedging ThCh$ ThCh$ ThCh$ Interest-bearing loans — 18,013,114 — Derivative instruments 7,369,481 — 313,571 Other financial liabilities — 617,955,794 — Total Current 7,369,481 635,968,908 313,571 Interest-bearing loans — 802,046,968 — Derivative instruments 2,987,830 — 48,981,953 Other financial liabilities — 1,734,640 — Total Non-current 2,987,830 803,781,608 48,981,953 Total 10,357,311 1,439,750,516 49,295,524
Summary of Financial Derivative Transactions Qualifying as Hedge Instruments Resulted in Recognition of Assets and Liabilities	As of December 31, 2017 and 2016, financial derivative transactions qualifying as hedge instruments resulted in recognition of the following assets and liabilities in the consolidated statement of financial position: December 31, 2017 Assets Liabilities Current Non-current Current Non-current ThCh$ ThCh$ ThCh$ ThCh$ Exchange rate hedge: 20,038,433 30,789,703 304,278 21,045,216 Cash flow hedge 20,038,433 30,789,703 304,278 21,045,216 Total 20,038,433 30,789,703 304,278 21,045,216 December 31, 2016 Assets Liabilities Current Non-current Current Non-current ThCh$ ThCh$ ThCh$ ThCh$ Exchange rate hedge: 121,443 25,533,189 313,571 48,981,953 Cash flow hedge 121,443 25,533,189 313,571 48,981,953 Total 121,443 25,533,189 313,571 48,981,953
Summary of Hedge Derivative Instruments and Their Corresponding Hedged Instruments	Hedge derivative instruments and their corresponding hedged instruments are shown in the following table: Detail of hedging Description of hedging instrument Description of hedged item Fair value of hedged item Fair value of hedged item Type of risk hedged instrument 12-31-2017 12-31-2016 ThCh$ ThCh$ SWAP Exchange rate Unsecured obligations (bonds) (*) 7,696,061 (23,640,892 ) Cash Flow FORWARD Exchange rate Revenues 21,782,581 — Cash Flow (*) See note 18.2.
Summary of Financial Derivative Transactions Recorded at Fair Value Through Profit or Loss Resulted in the Recognition of Assets and Liabilities	As of December 31, 2017 and 2016, financial derivative transactions recorded at fair value through profit or loss, resulted in the recognition of the following assets and liabilities in the statement of financial position: December 31, 2017 December 31, 2016 Current Assets Current Liabilities (*) Non-Current Assets Non-Current Liabilities (*) Current Assets Current Liabilities (*) Non-Current Assets Non-Current Liabilities (*) ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Non-hedging derivative instrument 402,716 1,255,478 — — — 7,369,481 — 2,987,830 (*) See note 18.
Summary of Fair Value of Hedging and Non-hedging Derivatives Entered Into by the Group as Well as the Remaining Contractual Maturities	The following tables present the fair value of hedging and non-hedging derivatives entered into by the Group as well as the remaining contractual maturities as of December 31, 2017 and 2016: December 31, 2017 Notional Amount Fair value Less than 1 year 1-2 years 2-3 years 3-4 years 4-5 years Total Financial derivatives ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Interest rate hedge: — — — — — — — Cash flow hedge — — — — — — — Exchange rate hedge: 29,478,642 306,350,419 525,812,635 — — — 832,163,054 Cash flow hedge 29,478,642 306,350,419 525,812,635 — — — 832,163,054 Derivatives not designated for hedge accounting (852,762 ) 19,682,638 — — — — 19,682,638 Total 28,625,880 326,033,057 525,812,635 — — — 851,845,692 December 31, 2016 Notional Amount Fair value Less than 1 year 1-2 years 2-3 years 3-4 years 4-5 years Total Financial derivatives ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Interest rate hedge: — — — — — — — Cash flow hedge — — — — — — — Exchange rate hedge: (23,640,892 ) — — 523,686,966 — — 523,686,966 Cash flow hedge (23,640,892 ) — — 523,686,966 — — 523,686,966 Derivatives not designated for hedge accounting (10,357,311 ) 49,738,751 21,434,625 — — — 71,173,376 Total (33,998,203 ) 49,738,751 21,434,625 523,686,966 — — 594,860,342
Schedule of Financial Assets and Liabilities Measured at Fair Value	The following table presents financial assets and liabilities measured at fair value as of December 31, 2017 and 2016: Fair Value Measured at End of 12-31-2017 Level 1 Level 2 Level 3 Financial Instruments Measured at Fair Value ThCh$ ThCh$ ThCh$ ThCh$ Financial Assets: Financial derivatives designated as cash flow hedges 50,828,136 — 50,828,136 — Financial derivatives not designated for hedge accounting 402,716 — 402,716 — Commodity derivatives not designated as cash flow hedges 9,940,955 — 9,940,955 — Commodity derivatives designated as cash flow hedges 5,742,633 — 5,742,633 Available-for-sale financial assets, non-current 33,158 33,158 — — Total 66,947,598 33,158 66,914,440 — Financial Liabilities: Financial derivatives designated as cash flow hedges 21,349,494 — 21,349,494 — Financial derivatives not designated for hedge accounting 1,255,478 — 1,255,478 — Commodity derivatives not designated for hedge accounting — — — — Commodity derivatives designated as cash flow hedges 889,026 — 889,026 — Total 23,493,998 — 23,493,998 — Fair Value Measured at End of 12-31-2016 Level 1 Level 2 Level 3 Financial Instruments Measured at Fair Value ThCh$ ThCh$ ThCh$ ThCh$ Financial Assets: Financial derivatives designated as cash flow hedges 25,654,632 — 25,654,632 — Commodity derivatives not designated for hedge accounting 875,841 — 875,841 — Commodity derivatives designated as cash flow hedges 16,159,565 — 16,159,565 — Available-for-sale financial assets, non-current 25,381 25,381 — — Total 42,715,419 25,381 42,690,038 — Financial Liabilities: Financial derivatives designated as cash flow hedges 49,295,524 — 49,295,524 — Financial derivatives not designated for hedge accounting 10,357,311 — 10,357,311 — Commodity derivatives not designated for hedge accounting 40,013 — 40,013 — Commodity derivatives designated as cash flow hedges 1,063,193 — 1,063,193 — Total 60,756,041 — 60,756,041 —

Trade and Other Current Payab70

Trade and Other Current Payables (Tables)	12 Months Ended
	Dec. 31, 2017
Trade And Other Payables [Abstract]
Summary of Trade and Other Current Payables	Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Trade and other payables ThCh$ ThCh$ ThCh$ ThCh$ Energy suppliers (*) 172,042,187 140,739,018 — — Fuel and gas suppliers 13,300,051 18,024,696 — — Subtotal Trade Payables 185,342,238 158,763,714 — — Other Payables Dividends payable to third parties 95,150,149 97,094,197 — — Payables for goods and services 170,859,517 166,241,384 4,485 40,256 Payable for assets acquisition 71,248,286 74,869,722 — — Warranty deposits 402,107 378,562 — Taxes payables other than income tax 17,648,643 11,581,921 — — VAT debit 25,766,224 22,396,497 — — Accounts payable to staff 27,466,888 28,952,388 — — Other payables 614,554 1,226,898 655,339 1,442,857 Subtotal Other Payables 409,156,368 402,741,569 659,824 1,483,113 Total 594,498,606 561,505,283 659,824 1,483,113 (*) As of December 31, 2017, Enel Distribución Chile S.A. has accrued ThCh$ 4,501,709 (ThCh$4,367,657 as of December 31, 2016) for payable expenses to generation companies due to delays in the publication of the decrees on Short-Term Node Prices and settlement of Average Node Prices.

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Provisions [Abstract]
Summary of Breakdown of Provisions	a) The breakdown of provisions as of December 31, 2017 and 2016, is as follows: Current Non-current 12-31-2017 12-31-2016 12-31-2017 12-31-2016 Provisions ThCh$ ThCh$ ThCh$ ThCh$ Provision for legal proceedings (1) 3,497,786 4,694,579 13,936,190 5,308,206 Decommissioning or restoration (2) — — 64,486,647 57,798,702 Other provisions 2,138,385 1,798,953 — — Total 5,636,171 6,493,532 78,422,837 63,106,908 (1) Provision for legal proceedings mainly consist of the contingencies related to lawsuits on administrative sanctions from our regulators. (2) Provision for decommissioning or restorations arises from the Bocamina II project and San Isidro Power Plant. The expected timing and amount of any cash outflows related to the above provisions is uncertain and depends on the final resolution of the provisioned matters.
Summary of Changes in Provisions	b) Changes in provisions as of December 31, 2017 and 2016, are as follows: Legal Proceedings Decommissioning or Restoration Environment and Other Provisions Total Changes in Provisions ThCh$ ThCh$ ThCh$ ThCh$ Balance at January 1, 2017 10,002,785 57,798,702 1,798,953 69,600,440 Increase (decrease) in existing provisions (1) 12,159,920 4,340,858 339,432 16,840,210 Provisions used (2,995,017 ) — — (2,995,017 ) Reversal of unused provision (1,728,788 ) — — (1,728,788 ) Increase from adjustment to time value of money (2) — 2,347,087 — 2,347,087 Foreign currency translation (4,924 ) — — (4,924 ) Total changes in provisions 7,431,191 6,687,945 339,432 14,458,568 Balance at December 31, 2017 17,433,976 64,486,647 2,138,385 84,059,008 Legal Proceedings Decommissioning or Restoration Other Provisions Total Changes in Provisions ThCh$ ThCh$ ThCh$ ThCh$ Balance at January 1, 2016 14,829,364 51,085,542 6,530,429 72,445,335 Increase (decrease) in existing provisions 111,723 4,161,948 (4,731,476 ) (457,805 ) Provisions used (4,948,439 ) — — (4,948,439 ) Increase from adjustment to time value of money — 2,551,212 — 2,551,212 Foreign currency translation 10,137 — — 10,137 Total changes in provisions (4,826,579 ) 6,713,160 (4,731,476 ) (2,844,895 ) Balance at December 31, 2016 10,002,785 57,798,702 1,798,953 69,600,440 (1) The increase in existing provisions in the year 2017 it is mainly due to sanctions taken by the Superintendency of Electricity and Fuels to Enel for an amount of ThCh $ 11,840,322. See note 35. (2) See Note 31.

Employee Benefit Obligations (T

Employee Benefit Obligations (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Defined Benefit Plans [Abstract]
Summary of Post- employment Obligations Associated with Defined Benefits Plan	a) The post-employment obligations associated with the defined benefits plan as of December 31, 2017, 2016 and 2015, are as follows: General ledger accounts: 12-31-2017 12-31-2016 12-31-2015 ThCh$ ThCh$ ThCh$ Post-employment obligations 57,081,924 59,934,127 55,023,456 Total 57,081,924 59,934,127 55,023,456 Total post-employment obligations, net 57,081,924 59,934,127 55,023,456
Summary of Defined Benefit Plans Expense Recognized in Statements of Comprehensive Income	b) The following amounts were recognized in the consolidated statement of comprehensive income for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Expense Recognized in the Statement of Comprehensive Income ThCh$ ThCh$ ThCh$ Current service cost for defined benefits plan 2,091,205 1,899,660 2,282,226 Interest cost for defined benefits plan 2,678,300 2,517,406 2,299,944 Expenses recognized in the Statement of Income 4,769,505 4,417,066 4,582,170 Gains (losses) from remeasurement of defined benefit plans (1,716,875 ) 6,618,514 5,645,532 Total expense recognized in the Statement of Comprehensive Income 3,052,630 11,035,580 10,227,702
Summary of Changes in Post-employment Defined Benefit Obligations	c) The balance and changes in post-employment defined benefit obligations as of and for the years ended December 31, 2017, 2016 and 2015, are as follows: Actuarial Value of Post-employment Obligations ThCh$ Balance at January 1, 2015 53,937,842 Current service cost 2,282,226 Net Interest cost 2,299,944 Actuarial (gains) losses from changes in financial assumptions 2,549,816 Actuarial (gains) losses from changes in experience adjustments 3,095,716 Foreign currency translation (697 ) Benefits paid (9,008,811 ) Other (132,580 ) Balance at December 31, 2015 55,023,456 Current service cost 1,899,660 Net Interest cost 2,517,406 Actuarial (gains) losses from changes in financial assumptions 1,073,475 Actuarial (gains) losses from changes in experience adjustments 5,545,039 Benefits paid (7,771,781 ) Transfers of employees 1,337,621 Other 309,251 Balance at December 31, 2016 59,934,127 Current service cost 2,091,205 Net Interest cost 2,678,300 Actuarial (gains) losses from changes in financial assumptions (1,414,201 ) Actuarial (gains) losses from changes in experience adjustments (302,674 ) Benefits paid (5,917,552 ) Transfers of employees 12,719 Balance at December 31, 2017 57,081,924
Summary of Assumptions Used in Actuarial Calculation of Defined Benefits	As of December 31, 2017, 2016 and 2015, the following assumptions were used in the actuarial calculation of defined benefits: 12-31-2017 12-31-2016 12-31-2015 Discount rates used 5.00% 4.70% 5.00% Expected rate of salary increases 4.00% 4.00% 4.00% Turnover rate 4.57% 4.72% 4.89% Mortality tables CB-H-2014 / RV-M-2014 CB-H-2014 / RV-M-2014 RV-2009
Summary of Expected Flow for Benefits for Next Five Years	The Group’s obligations have a weighted average length of 9.18 years, and the flow for benefits for the next five years and more is expected to be as follows: Years ThCh$ 1 5,558,032 2 4,970,959 3 4,203,682 4 5,105,974 5 4,917,461 Over 5 22,844,851

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Shareholders Equity [Line Items]
Summary of Dividends Paid	Dividends Dividend No. Type of Dividend Payment Date Pesos per Share Charged to 1 Final 05-24-2016 2.09338 2015 2 Interim 01-27-2017 0.75884 2016 3 Final 05-26-2017 2.47546 2016 4 Interim 01-26-2018 0.75642 2017
Summary of Foreign Currency Translation Adjustments	The following table sets forth foreign currency translation adjustments attributable to the shareholders of the Company for the years ended December 31, 2017, 2016 and 2015: For the years ended December 31, 2017 2016 2015 Reserves for Accumulated Currency Translation Differences ThCh$ ThCh$ ThCh$ GasAtacama Chile S.A. (1) 6,416,189 8,484,094 9,582,184 Electrogas (2) — — 1,875,303 GNL Chile S.A. 560,194 738,839 328,447 GNL Quintero S.A. (3) — — 637,758 TOTAL 6,976,383 9,222,933 12,423,692 (1) From 1 January 2015, there was a change in the functional currency for this entity from the US dollar to the Chilean peso. (2) See Note 5. (3) See Note 12.b).
Summary of Other Reserves Within Equity	Other reserves within Equity attributable to Enel Chile for the years ended December 31, 2017, 2016 and 2015 are as follows: Balance at January 1, 2017 2017 Changes Balance at December 31, 2017 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 9,222,933 (2,246,550 ) 6,976,383 Cash flow hedges (b) (76,218,470 ) 43,368,734 (32,849,736 ) Available-for-sale financial assets 9,955 1,329 11,284 Other miscellaneous reserves (c) (969,740,120 ) (1,728,359 ) (971,468,479 ) Other comprehensive income from non-current assets held for Sale (d) 1,632,724 (1,632,724 ) — TOTAL (1,035,092,978 ) 37,762,430 (997,330,548 ) Balance at January 1, 2016 2016 Changes Balance at December 31, 2016 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 12,423,692 (3,200,759 ) 9,222,933 Cash flow hedges (b) (121,503,052 ) 45,284,582 (76,218,470 ) Available-for-sale financial assets 14,835 (4,880 ) 9,955 Other comprehensive income from non-current assets held for sale (d) — 1,632,724 1,632,724 Other miscellaneous reserves (c) (849,525,427 ) (120,214,693 ) (969,740,120 ) TOTAL (958,589,952 ) (76,503,026 ) (1,035,092,978 ) Balance at January 1, 2015 2015 Changes Balance at December 31, 2015 Other reserves ThCh$ ThCh$ ThCh$ Exchange differences on translation (a) 11,443,966 979,726 12,423,692 Cash flow hedges (b) (66,850,863 ) (54,652,189 ) (121,503,052 ) Available-for-sale financial assets 14,046 789 14,835 Other miscellaneous reserves (c) (873,486,367 ) 23,960,940 (849,525,427 ) TOTAL (928,879,218 ) (29,710,734 ) (958,589,952 ) a) Exchange differences on translation: These reserves arise primarily from exchange differences relating to: (i) Translation of the financial statements of our subsidiaries from their functional currencies to our presentation currency (i.e. Chilean peso) (see Note 2.7.3). b) Cash flow hedging reserves: These reserves represent the cumulative effective portion of gains and losses recognized in cash flow hedges (see Note 3.g.5 and 3.h). c) Other miscellaneous reserves (i) Reserve for corporate reorganization (“Spin-Off”) : Corresponds to the effects from the corporate reorganization of the Company, as described in Note 1, and the separation of the foreign business in Enel Américas. This reserve includes the effect of the taxes that Enel Generación Chile (formerly named Endesa Chile) and Enel Distribución Chile (formerly named Chilectra Chile) paid in Peru for transferring their investments to Endesa Américas and Chilectra Américas. The tax payments made by Enel Generación Chile, in March 2016, and Enel Distribución Chile, in April 2016, were 577 million Soles (ThCh$100,978,571) and 74 million Soles (ThCh$15,193,186), respectively. The calculation basis for determining the tax corresponds to the difference between the market value of the investments, to the date of the transfer, and the cost of tax acquisition of the participations. The net economic effect on the opening equity was ThCh$90,274,727. It should be noted that, being directly linked to the split transaction, the accounting record of this tax has been made directly in equity, specifically in Other reserves, following the nature of the main transaction (transaction with shareholders), (See Notes 1 and 2). (ii) Reserve for transition to IFRS : In accordance with Official Bulletin No. 456 from the CMF, included in this line item is the monetary correction corresponding to the accumulated paid-up capital from the date of our transition to IFRS, January 1, 2004, to December 31, 2008. (iii) Reserve for subsidiaries transactions (iv) Other miscellaneous reserves from transactions made in prior years.
Summary of Non-controlling Interests	The detail of non-controlling interests is as follows: Non-controlling Interests Equity Profit (Loss) 12-31-2017 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 Companies % ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Enel Distribución Chile S.A. 0.91% 6,223,363 6,441,611 5,751,343 961,490 1,210,871 1,294,111 Enel Generación Chile S.A. 40.02% 784,999,394 680,725,188 590,091,089 167,465,216 173,299,349 84,976,889 Empresa Eléctrica Pehuenche S.A. 7.35% 9,963,472 10,008,502 10,900,863 5,649,253 6,512,893 8,674,207 Sociedad Agrícola de Cameros Ltda. 42.50% 2,596,764 2,636,470 2,675,177 (39,706 ) (38,707 ) 191,838 Other (205,346 ) (209,417 ) (199,191 ) (984 ) 126,845 (7,291 ) TOTAL 803,577,647 699,602,354 609,219,281 174,035,269 181,111,251 95,129,754
Other Miscellaneous Reserves [Member]
Disclosure Of Shareholders Equity [Line Items]
Summary of Other Reserves Within Equity	The main items and their effects are the following: For the years ended 2017 2016 2015 Other Miscellaneous Reserves ThCh$ ThCh$ ThCh$ Reserve for corporate reorganization ("Spin-Off") (i) (534,057,733 ) (532,330,290 ) (421,335,641 ) Reserve for transition to IFRS (ii) (457,221,836 ) (457,221,836 ) (457,221,836 ) Reserve for subsidiaries transactions (iii) 12,502,494 12,502,494 12,502,494 Other Miscellaneous Reserves (iv) 7,308,596 7,309,512 16,529,556 TOTAL (971,468,479 ) (969,740,120 ) (849,525,427 )

Revenue and Other Operating I74

Revenue and Other Operating Income (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Revenue And Other Operating Income [Abstract]
Summary of Revenues and Other Operating Income	The detail of revenues for the years ended December 31, 2017, 2016 and 2015, is as follows: For the years ended December 31, 2017 2016 2015 Revenues ThCh$ ThCh$ ThCh$ Energy sales 2,268,459,154 2,312,643,619 2,247,363,757 Generation 1,082,749,256 1,141,725,803 1,134,450,921 Regulated customers 726,166,640 805,079,958 726,264,558 Non-regulated customers 285,623,737 234,641,908 264,113,111 Spot market sales 70,958,879 102,003,937 140,339,722 Other customers — — 3,733,530 Distribution 1,185,709,898 1,170,917,816 1,112,912,836 Residential 442,137,827 431,610,828 407,435,626 Business 386,608,105 379,037,776 350,157,120 Industrial 225,736,231 229,878,875 230,416,697 Other consumers (1) 131,227,735 130,390,337 124,903,393 Other sales 107,362,797 73,607,457 32,057,524 Natural gas sales 91,652,707 64,443,715 12,582,771 Sales of products and services 15,710,090 9,163,742 19,474,753 Revenue from other services 114,648,227 129,592,804 104,871,908 Tolls and transmission 39,812,005 51,014,073 37,958,975 Metering equipment leases 4,945,609 4,555,779 4,415,191 Public lighting 13,449,852 12,660,894 10,859,012 Engineering and consulting services 3,414,472 14,304,336 1,817,284 Other services (2) 53,026,289 47,057,722 49,821,446 Total Revenues 2,490,470,178 2,515,843,880 2,384,293,189 Other Operating Income ThCh$ ThCh$ ThCh$ Mutual support — — 14,563 Commodity derivatives 20,328,649 10,794,682 1,820,371 Other income (3) 18,548,051 14,928,257 12,901,017 Total other income 38,876,700 25,722,939 14,735,951 (1) For the year ended December 31, 2017, it includes revenues from energy sales to municipalities of ThCh$36,165,698; government entities of ThCh$20,080,121 and agricultural sector entities of ThCh$5,811,319, and other of ThCh$ (2) For the year ended December 31, 2017, it includes services for construction of junctions of ThCh$15,514,433; works in specific facilities and networks of ThCh$15,125,128; and other services of ThCh$22,386,728. For the year ended December 31, 2016, it includes services for construction of junctions of ThCh$14,359,194; works in specific facilities and networks of ThCh$21,397,176; and other services of ThCh$11,301,352. For the year ended December 31, 2015, it includes services for construction of junctions of ThCh$16,289,581; works in specific facilities and networks of ThCh$16,736,234; and other services of ThCh$11,741,987. (3) For the year ended December 31, 2017, it includes revenues from energy losses recoveries of ThCh$1,968,203; revenues from outdated collection of invoices of ThCh$1,299,470; and revenues from other services of ThCh$15,280,378. For the year ended December 31, 2016, it includes revenues from energy losses recoveries of ThCh$1,344,529; revenues from outdated collection of invoices of ThCh$1,540,348; and revenues from other services of ThCh$12,043,380. For the year ended December 31, 2015, it mainly related to revenues from water sales of ThCh$823,821; and revenues from other services for ThCh$4,877,987.

Raw Materials and Consumables75

Raw Materials and Consumables Used (Tables)	12 Months Ended
	Dec. 31, 2017
Analysis Of Income And Expense [Abstract]
Schedule of Raw Materials and Consumables Used	The detail of raw materials and consumables used for the years ended December 31, 2017, 2016 and 2015, is as follows: For the years ended December 31, 2017 2016 2015 Raw materials and consumables used ThCh$ ThCh$ ThCh$ Energy purchases (902,434,871 ) (891,746,884 ) (860,203,181 ) Fuel consumption (280,739,362 ) (295,148,838 ) (327,502,996 ) Transportation costs (155,879,249 ) (195,123,118 ) (182,453,155 ) Other raw materials and consumables (182,102,035 ) (115,400,740 ) (111,826,227 ) Total (1,521,155,517 ) (1,497,419,580 ) (1,481,985,559 )

Employee Benefits Expense (Tabl

Employee Benefits Expense (Tables)	12 Months Ended
	Dec. 31, 2017
Classes Of Employee Benefits Expense [Abstract]
Summary of Employee Expenses	Employee expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Employee Benefits Expense ThCh$ ThCh$ ThCh$ Wages and salaries (100,653,880 ) (100,938,761 ) (115,982,152 ) Post-employment benefit obligations expense (2,091,205 ) (1,899,660 ) (2,282,226 ) Social security and other contributions (18,758,692 ) (21,260,007 ) (18,290,343 ) Total (121,503,777 ) (124,098,428 ) (136,554,721 )

Depreciation, Amortization an77

Depreciation, Amortization and Impairment Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Depreciation Amortization And Impairment [Abstract]
Summary of Depreciation, Amortization and Impairment losses	The detail of depreciation, amortization and impairment losses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 ThCh$ ThCh$ ThCh$ Depreciation (145,873,065 ) (155,826,620 ) (148,421,514 ) Amortization (6,811,041 ) (5,833,990 ) (4,780,148 ) Subtotal (152,684,106 ) (161,660,610 ) (153,201,662 ) Impairment (Losses) Reversals (*) (7,937,817 ) (35,926,710 ) 3,054,903 Total (160,621,923 ) (197,587,320 ) (150,146,759 ) Balance as of (*) Impairment Losses Generation Distribution Total 2017 2016 2015 2017 2016 2015 2017 2016 2015 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Impairment losses of financial assets (See Note 8.d) 55,494 — (371,558 ) (7,993,311 ) (5,141,179 ) (6,738,750 ) (7,937,817 ) (5,141,179 ) (7,110,308 ) Impairment losses of property, plant and equipment (See Note 15) — (30,785,531 ) 10,165,211 — — — — (30,785,531 ) 10,165,211 Total 55,494 (30,785,531 ) 9,793,653 (7,993,311 ) (5,141,179 ) (6,738,750 ) (7,937,817 ) (35,926,710 ) 3,054,903

Other Expenses (Tables)

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Cost And Expenses By Nature [Abstract]
Summary of Other Miscellaneous Operating Expenses	Other miscellaneous operating expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Other Expenses ThCh$ ThCh$ ThCh$ Other supplies and services (17,064,008 ) (23,962,717 ) (16,365,050 ) Professional, outsourced and other services (58,622,123 ) (55,571,694 ) (43,006,875 ) Repairs and maintenance (13,999,283 ) (11,030,522 ) (14,034,924 ) Indemnities and fines (776,011 ) (3,046,557 ) (1,754,069 ) Taxes and charges (5,105,235 ) (4,972,995 ) (7,406,215 ) Insurance premiums (13,277,718 ) (17,148,278 ) (15,942,047 ) Leases and rental costs (2,969,436 ) (3,250,503 ) (10,098,166 ) Marketing, public relations and advertising (2,501,027 ) (3,736,414 ) (3,166,181 ) Written-off Huechún and Chillán projects (*) — (36,480,223 ) — Written-off projects in progress (*) (25,105,911 ) — — Other supplies (11,188,148 ) (6,132,681 ) (6,041,038 ) Travel expenses (3,445,944 ) (3,190,662 ) (4,103,471 ) Environmental expenses (7,769,230 ) (2,245,891 ) (3,939,361 ) Total (161,824,074 ) (170,769,137 ) (125,857,397 ) (*) See Note 15.e).ix).

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Gains Net [Abstract]
Summary of Other gains (losses)	Other gains (losses) for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Other Gains (Losses) ThCh$ ThCh$ ThCh$ Gain on sale of building (Alonso de Cordova) — — 14,610,544 Gain on sale of Tunel El Melón — — 4,207,167 Gain on sale of GNL Quintero S.A. (**) — 121,325,018 — Gain on sale of Electrogas (*) 105,311,912 — — Gain on sale of investment properties — — 1,463,163 Gain on sale of assets 7,779,531 — — Other 149,753 165,044 (225,129 ) Total 113,241,196 121,490,062 20,055,745 (*) See Note 5. (**) See Note 12.

Financial Results (Tables)

Financial Results (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Results [Abstract]
Summary of Financial Income and Costs	Financial income and costs for the years ended December 31, 2017, 2016 and 2015, are as follows: For the years ended December 31, 2017 2016 2015 Financial Income ThCh$ ThCh$ ThCh$ Income from deposits and other financial instruments 8,377,023 5,733,428 2,566,017 Interests charged to customers in energy accounts and billing 8,556,587 — — Other financial income 4,729,078 17,372,473 12,704,152 Total Financial Income 21,662,688 23,105,901 15,270,169 For the years ended December 31, 2017 2016 2015 Financial Costs ThCh$ ThCh$ ThCh$ Financial Costs (53,510,882 ) (58,199,382 ) (66,700,698 ) Bank loans (12,585 ) (2,034,277 ) (131,502 ) Secured and unsecured obligations (42,708,253 ) (44,268,489 ) (51,697,708 ) Financial leasing (811,172 ) (780,953 ) (1,039,013 ) Valuation of financial derivatives (1,067,820 ) (824,922 ) (1,725,211 ) Financial provisions (1) (2,347,087 ) (2,551,211 ) (1,881,826 ) Post-employment benefit obligations (2) (2,678,300 ) (2,517,406 ) (2,299,944 ) Debt formalization expenses and other associated expenses (836,174 ) — — Capitalized borrowing costs 4,078,463 3,001,211 2,221,329 Other financial costs (7,127,954 ) (8,223,335 ) (10,146,823 ) Loss from indexed assets and liabilities (*) 916,666 1,631,840 4,839,077 Foreign currency exchange differences (**) 8,516,874 12,978,471 (51,277,332 ) Total Financial Costs (44,077,342 ) (43,589,071 ) (113,138,953 ) Total Financial Results (22,414,654 ) (20,483,170 ) (97,868,784 ) (1) See note 22. (2) See note 23.
Summary of Effects on Exchange Differences and Application of Indexed Assets and Liabilities	(*) and (**) The effects on financial results from exchange differences and the application of indexed assets and liabilities originated from the following: For the years ended December 31, 2017 2016 2015 Profit (losses) from Indexed Assets and Liabilities (*) ThCh$ ThCh$ ThCh$ Other financial assets 4,659,933 7,237,000 10,153,342 Other non-financial assets — — 840,108 Trade and other receivables 155,158 1,077,086 745,270 Current tax assets and liabilities 1,654,538 2,349,415 6,052,524 Other financial liabilities (financial debt and derivative instruments) (5,551,163 ) (9,014,858 ) (12,864,959 ) Trade and other payables (1,800 ) (16,803 ) (73,133 ) Other provisions — — (14,075 ) Total 916,666 1,631,840 4,839,077 For the years ended December 31, 2017 2016 2015 Foreign Currency Exchange Differences (**) ThCh$ ThCh$ ThCh$ Cash and cash equivalents 2,931,086 240,451 5,021,381 Other financial assets 10,895,862 25,476,638 10,637,768 Trade and other receivables 390,764 2,595,997 10,313,151 Current tax assets and liabilities (188,270 ) — — Other financial liabilities (financial debt and derivative instruments) (4,358,937 ) (18,538,354 ) (30,533,746 ) Trade and other payables (1,152,505 ) 3,203,739 (46,715,886 ) Other non-financial liabilities (1,126 ) — — Total 8,516,874 12,978,471 (51,277,332 )

Information by Segment (Tables)

Information by Segment (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Segment Assets And Segment Liabilities [Abstract]
Summary of Assets and Liabilities by Segment	The following tables present details of this information by segment: 32.2 Generation, distribution and others Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 ASSETS ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ CURRENT ASSETS 662,804,360 543,372,955 261,378,069 245,122,733 135,159,356 78,031,249 1,059,341,785 866,526,937 Cash and cash equivalents 211,027,141 114,486,479 42,594,390 23,378,615 165,834,495 108,134,098 419,456,026 245,999,192 Other current financial assets 20,523,276 487,106 61,887 47,517 41,899 49,621 20,627,062 584,244 Other current non-financial assets 2,167,272 4,409,288 3,434,462 11,091,061 400,408 331,137 6,002,142 15,831,486 Trade and other current receivables 218,178,007 260,440,086 197,011,114 180,290,279 4,563,165 4,341,491 419,752,286 445,071,856 Current accounts receivable from related companies 109,797,820 82,727,781 6,305,806 8,895,440 (44,247,580 ) (38,764,837 ) 71,856,046 52,858,384 Inventories 31,740,903 33,390,799 3,049,576 1,878,072 4,896,463 2,270,725 39,686,942 37,539,596 Current tax assets 65,164,708 34,438,408 8,920,834 19,541,749 3,670,506 1,669,014 77,756,048 55,649,171 Non-current assets classified as held for sale 4,205,233 12,993,008 — — — — 4,205,233 12,993,008 NON-CURRENT ASSETS 2,891,657,830 2,856,309,537 893,633,579 829,203,115 850,139,814 846,671,423 4,635,431,223 4,532,184,075 Other non-current financial assets 33,391,398 28,802,569 26,806 24,973 — — 33,418,204 28,827,542 Other non-current non-financial assets 12,853,460 12,318,444 959,679 1,019,050 — (1,342 ) 13,813,139 13,336,152 Trade and other non-current receivables 1,032,922 6,788,437 34,272,234 24,978,209 877,243 1,733,459 36,182,399 33,500,105 Investments accounted for using the equity method 12,707,221 18,738,198 — 60,325 — (60,325 ) 12,707,221 18,738,198 Intangible assets other than goodwill 18,607,972 19,266,874 34,236,891 25,430,420 2,326,041 (226,544 ) 55,170,904 44,470,750 Goodwill 24,860,356 24,860,356 2,240,478 2,240,478 860,156,821 860,156,821 887,257,655 887,257,655 Property, plant and equipment 2,788,204,501 2,726,838,536 821,234,672 774,999,730 (23,752,036 ) (25,709,632 ) 3,585,687,137 3,476,128,634 Investment property — — — — 8,356,772 8,128,522 8,356,772 8,128,522 Deferred tax assets — 18,696,123 662,819 449,930 2,174,973 2,650,464 2,837,792 21,796,517 TOTAL ASSETS 3,554,462,190 3,399,682,492 1,155,011,648 1,074,325,848 985,299,170 924,702,672 5,694,773,008 5,398,711,012 Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 12-31-2017 12-31-2016 LIABILITIES AND EQUITY ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ CURRENT LIABILITIES 543,356,500 555,777,465 408,687,871 259,684,837 (135,227,725 ) (58,215,655 ) 816,816,646 757,246,647 Other current financial liabilities 18,815,434 25,696,064 14 102 — — 18,815,448 25,696,166 Trade and other current payables 329,448,226 341,088,664 189,458,076 151,549,875 75,592,304 68,866,744 594,498,606 561,505,283 Current accounts payable to related companies 122,862,944 121,018,039 207,909,593 96,520,909 (211,159,565 ) (127,110,019 ) 119,612,972 90,428,929 Other current provisions 5,296,635 6,493,428 — 104 339,536 — 5,636,171 6,493,532 Current tax liabilities 66,933,261 61,457,940 94,246 113,855 — 27,620 67,027,507 61,599,415 Other current non-financial liabilities — 23,330 11,225,942 11,499,992 — — 11,225,942 11,523,322 NON-CURRENT LIABILITIES 1,022,091,736 1,114,144,775 61,965,918 106,283,505 6,937,051 (41,957,557 ) 1,090,994,705 1,178,470,723 Other non-current financial liabilities 781,978,145 854,016,751 — — — — 781,978,145 854,016,751 Trade and other non-current payables 632,642 1,453,022 27,182 30,091 — — 659,824 1,483,113 Non-current accounts payable to related companies 318,518 251,527 — 50,000,180 — (50,000,180 ) 318,518 251,527 Other long-term provisions 63,992,567 57,325,914 14,430,270 5,780,994 — — 78,422,837 63,106,908 Deferred tax liabilities 160,293,916 185,277,004 18,786,185 20,502,853 (6,856,420 ) (6,415,063 ) 172,223,681 199,364,794 Non-current provisions for employee benefits 14,875,948 15,820,557 28,412,505 29,655,884 13,793,471 14,457,686 57,081,924 59,934,127 Other non-current non-financial liabilities — — 309,776 313,503 — — 309,776 313,503 EQUITY 1,989,013,954 1,729,760,252 684,357,859 708,357,506 1,113,589,844 1,024,875,884 3,786,961,657 3,462,993,642 Equity attributable to Enel Chile 1,989,013,954 1,729,760,252 684,357,859 708,357,506 1,113,589,844 1,024,875,884 2,983,384,010 2,763,391,288 Issued capital 552,777,321 552,777,321 230,137,980 230,137,980 1,446,193,674 1,446,193,674 2,229,108,975 2,229,108,975 Retained earnings 1,398,018,156 1,199,429,221 769,928,443 794,856,204 (416,341,016 ) (424,910,134 ) 1,751,605,583 1,569,375,291 Share Premium 85,511,492 — 354,220 — (85,865,712 ) — — Other reserves (47,293,015 ) (22,446,290 ) (316,062,784 ) (316,636,678 ) 169,602,898 3,592,344 (997,330,548 ) (1,035,092,978 ) Non-controlling interests — — — — — — 803,577,647 699,602,354 Total Liabilities and Equity 3,554,462,190 3,399,682,492 1,155,011,648 1,074,325,848 985,299,170 924,702,672 5,694,773,008 5,398,711,012
Summary of Comprehensive Income by Segment	Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF COMPREHENSIVE INCOME ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ REVENUES AND OTHER OPERATING INCOME 1,634,937,087 1,659,727,329 1,543,812,461 1,333,027,456 1,315,760,852 1,257,732,165 (438,617,665 ) (433,921,362 ) (402,515,486 ) 2,529,346,878 2,541,566,819 2,399,029,140 Revenues 1,599,032,140 1,639,959,816 1,539,991,519 1,328,791,205 1,310,175,226 1,247,900,614 (437,353,167 ) (434,291,162 ) (403,598,944 ) 2,490,470,178 2,515,843,880 2,384,293,189 Energy sales 1,457,671,722 1,516,688,442 1,474,818,366 1,186,795,410 1,172,700,558 1,112,912,836 (376,007,978 ) (376,745,382 ) (340,367,445 ) 2,268,459,154 2,312,643,618 2,247,363,757 Other sales 94,452,287 64,638,599 24,293,133 12,741,568 8,968,859 7,769,616 168,942 — (5,225 ) 107,362,797 73,607,458 32,057,524 Other services rendered 46,908,131 58,632,775 40,880,020 129,254,227 128,505,809 127,218,162 (61,514,131 ) (57,545,780 ) (63,226,274 ) 114,648,227 129,592,804 104,871,908 Other operating income 35,904,947 19,767,513 3,820,942 4,236,251 5,585,626 9,831,551 (1,264,498 ) 369,800 1,083,458 38,876,700 25,722,939 14,735,951 RAW MATERIALS AND CONSUMABLES USED (903,978,006 ) (895,060,114 ) (880,891,222 ) (1,062,076,646 ) (1,042,329,385 ) (983,732,902 ) 444,899,135 439,969,919 382,638,565 (1,521,155,517 ) (1,497,419,580 ) (1,481,985,559 ) Energy purchases (346,954,692 ) (335,731,822 ) (320,731,795 ) (938,067,783 ) (936,965,119 ) (881,589,779 ) 382,587,604 380,950,057 342,118,393 (902,434,871 ) (891,746,884 ) (860,203,181 ) Fuel consumption (280,739,362 ) (295,148,838 ) (327,502,995 ) — — — — — — (280,739,362 ) (295,148,838 ) (327,502,995 ) Transportation expenses (152,869,838 ) (192,502,995 ) (179,691,471 ) (63,009,956 ) (60,454,433 ) (60,901,746 ) 60,000,545 57,834,310 58,140,062 (155,879,249 ) (195,123,118 ) (182,453,155 ) Other miscellaneous supplies and services (123,414,114 ) (71,676,459 ) (52,964,961 ) (60,998,907 ) (44,909,833 ) (41,241,377 ) 2,310,986 1,185,552 (17,619,890 ) (182,102,035 ) (115,400,740 ) (111,826,228 ) CONTRIBUTION MARGIN 730,959,081 764,667,215 662,921,239 270,950,810 273,431,467 273,999,263 6,281,470 6,048,557 (19,876,921 ) 1,008,191,361 1,044,147,239 917,043,581 Other work performed by the entity and capitalized 7,226,484 9,758,304 15,250,811 6,630,130 6,338,547 5,753,242 532,373 1 — 14,388,987 16,096,852 21,004,053 Employee benefits expense (54,222,470 ) (60,350,072 ) (70,969,357 ) (38,449,551 ) (35,557,457 ) (32,454,962 ) (28,831,756 ) (28,190,899 ) (33,130,402 ) (121,503,777 ) (124,098,428 ) (136,554,721 ) Other expenses (102,821,020 ) (119,303,215 ) (90,327,960 ) (61,942,592 ) (52,077,948 ) (62,182,651 ) 2,939,538 612,026 26,653,214 (161,824,074 ) (170,769,137 ) (125,857,397 ) GROSS OPERATING INCOME 581,142,075 594,772,232 516,874,733 177,188,797 192,134,609 185,114,892 (19,078,375 ) (21,530,315 ) (26,354,109 ) 739,252,497 765,376,526 675,635,516 Depreciation and amortization expense (117,337,553 ) (132,600,381 ) (124,835,559 ) (36,685,324 ) (30,399,304 ) (29,082,449 ) 1,338,771 1,339,075 716,346 (152,684,106 ) (161,660,610 ) (153,201,662 ) Impairment losses (reversal of impairment losses) recognized in profit or loss 55,494 (30,785,531 ) 9,793,653 (7,993,311 ) (5,141,179 ) (6,738,750 ) — — — (7,937,817 ) (35,926,710 ) 3,054,903 OPERATING INCOME 463,860,016 431,386,320 401,832,827 132,510,162 156,594,126 149,293,693 (17,739,604 ) (20,191,240 ) (25,637,763 ) 578,630,574 567,789,206 525,488,757 FINANCIAL RESULT (36,610,248 ) (35,678,632 ) (114,252,182 ) 6,411,837 8,579,316 12,294,531 7,783,757 6,616,146 4,088,867 (22,414,654 ) (20,483,170 ) (97,868,784 ) Financial income 5,273,672 6,150,751 234,822 12,894,635 14,289,185 13,308,032 3,494,381 2,665,965 1,727,315 21,662,688 23,105,901 15,270,169 Cash and cash equivalents 3,077,708 2,150,797 152,518 1,975,564 1,680,365 634,961 3,323,751 — 1,778,538 8,377,023 3,831,162 2,566,017 Other financial income 2,195,964 3,999,954 82,304 10,919,071 12,608,820 12,673,071 170,630 2,665,965 (51,223 ) 13,285,665 19,274,739 12,704,152 Financial costs (50,851,829 ) (55,701,778 ) (64,206,719 ) (7,094,366 ) (6,488,659 ) (1,801,829 ) 4,435,313 3,991,055 (692,150 ) (53,510,882 ) (58,199,382 ) (66,700,698 ) Bank borrowings (261 ) (2,033,835 ) (129,350 ) (12,299 ) (476 ) (1,659 ) (25 ) — (494 ) (12,585 ) (2,034,311 ) (131,503 ) Secured and unsecured obligations (42,708,253 ) (44,268,489 ) (51,697,708 ) — — — — — — (42,708,253 ) (44,268,489 ) (51,697,708 ) Other (8,143,315 ) (9,399,454 ) (12,379,661 ) (7,082,067 ) (6,488,183 ) (1,800,170 ) 4,435,338 3,991,055 (691,656 ) (10,790,044 ) (11,896,582 ) (14,871,487 ) Profit (loss) from indexed assets and liabilities 145,608 606,075 3,600,187 761,262 974,891 973,087 9,796 50,874 265,803 916,666 1,631,840 4,839,077 Foreign currency exchange differences 8,822,301 13,266,320 (53,880,472 ) (149,694 ) (196,101 ) (184,759 ) (155,733 ) (91,748 ) 2,787,899 8,516,874 12,978,471 (51,277,332 ) Positive 19,563,838 48,546,664 26,738,738 58,288 609,359 (235,571 ) 134,942 65,643 3,930,935 19,757,068 49,221,666 30,434,102 Negative (10,741,537 ) (35,280,344 ) (80,619,210 ) (207,982 ) (805,460 ) 50,812 (290,675 ) (157,391 ) (1,143,036 ) (11,240,194 ) (36,243,195 ) (81,711,434 ) Share of profit of associates accounted for using the equity method (2,696,904 ) 7,878,201 8,905,045 — 1,818 5,248 — (1,819 ) (5,248 ) (2,696,904 ) 7,878,200 8,905,045 Other gains (losses) 113,088,869 121,490,974 4,015,401 157,458 (831 ) 14,660,351 (5,131 ) (81 ) 1,379,993 113,241,196 121,490,062 20,055,745 Gain (loss) from other investments 105,462,769 121,457,430 4,309,205 4,026 (831 ) — (5,131 ) (81 ) (346 ) 105,461,664 121,456,518 4,308,859 Gain (loss) from the sale of property, plant and equipment 7,626,100 33,544 (293,804 ) 153,432 — 14,660,351 — — 1,380,339 7,779,532 33,544 15,746,886 Income before tax 537,641,733 525,076,863 300,501,091 139,079,457 165,174,429 176,253,823 (9,960,978 ) (13,576,994 ) (20,174,151 ) 666,760,212 676,674,298 456,580,763 Income tax (112,099,519 ) (83,216,935 ) (76,655,819 ) (34,030,322 ) (32,589,362 ) (36,956,051 ) 2,787,540 4,403,115 3,999,271 (143,342,301 ) (111,403,182 ) (109,612,599 ) Net income from continuing operations 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income from discontinued operations — — — — — — — — — — — — NET INCOME 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income attributable to: 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Shareholders of Enel Chile — — — — — — — — — 349,382,642 384,159,865 251,838,410 Non-controlling interests — — — — — — — — — 174,035,269 181,111,251 95,129,754 Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF CASH FLOWS ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Cash flows from (used in) operating activities 488,157,362 490,177,558 428,211,622 170,628,958 148,354,968 194,756,025 (23,182,620 ) (23,847,670 ) (46,436,120 ) 635,613,720 614,684,856 576,531,527 Cash flows from (used in) investing activities (91,867,647 ) (34,631,759 ) (255,251,615 ) (74,464,531 ) (55,007,620 ) (82,947,418 ) 19,886,401 26,150,787 41,457,686 (146,465,777 ) (63,488,592 ) (296,741,347 ) Cash flows from (used in) financing activities (301,835,211 ) (374,835,378 ) (175,094,207 ) (76,923,085 ) (88,519,047 ) (98,304,569 ) 61,162,775 17,487,453 (43,674 ) (317,595,521 ) (445,866,972 ) (273,442,450 )
Summary of Cash Flow by Segment	Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF COMPREHENSIVE INCOME ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ REVENUES AND OTHER OPERATING INCOME 1,634,937,087 1,659,727,329 1,543,812,461 1,333,027,456 1,315,760,852 1,257,732,165 (438,617,665 ) (433,921,362 ) (402,515,486 ) 2,529,346,878 2,541,566,819 2,399,029,140 Revenues 1,599,032,140 1,639,959,816 1,539,991,519 1,328,791,205 1,310,175,226 1,247,900,614 (437,353,167 ) (434,291,162 ) (403,598,944 ) 2,490,470,178 2,515,843,880 2,384,293,189 Energy sales 1,457,671,722 1,516,688,442 1,474,818,366 1,186,795,410 1,172,700,558 1,112,912,836 (376,007,978 ) (376,745,382 ) (340,367,445 ) 2,268,459,154 2,312,643,618 2,247,363,757 Other sales 94,452,287 64,638,599 24,293,133 12,741,568 8,968,859 7,769,616 168,942 — (5,225 ) 107,362,797 73,607,458 32,057,524 Other services rendered 46,908,131 58,632,775 40,880,020 129,254,227 128,505,809 127,218,162 (61,514,131 ) (57,545,780 ) (63,226,274 ) 114,648,227 129,592,804 104,871,908 Other operating income 35,904,947 19,767,513 3,820,942 4,236,251 5,585,626 9,831,551 (1,264,498 ) 369,800 1,083,458 38,876,700 25,722,939 14,735,951 RAW MATERIALS AND CONSUMABLES USED (903,978,006 ) (895,060,114 ) (880,891,222 ) (1,062,076,646 ) (1,042,329,385 ) (983,732,902 ) 444,899,135 439,969,919 382,638,565 (1,521,155,517 ) (1,497,419,580 ) (1,481,985,559 ) Energy purchases (346,954,692 ) (335,731,822 ) (320,731,795 ) (938,067,783 ) (936,965,119 ) (881,589,779 ) 382,587,604 380,950,057 342,118,393 (902,434,871 ) (891,746,884 ) (860,203,181 ) Fuel consumption (280,739,362 ) (295,148,838 ) (327,502,995 ) — — — — — — (280,739,362 ) (295,148,838 ) (327,502,995 ) Transportation expenses (152,869,838 ) (192,502,995 ) (179,691,471 ) (63,009,956 ) (60,454,433 ) (60,901,746 ) 60,000,545 57,834,310 58,140,062 (155,879,249 ) (195,123,118 ) (182,453,155 ) Other miscellaneous supplies and services (123,414,114 ) (71,676,459 ) (52,964,961 ) (60,998,907 ) (44,909,833 ) (41,241,377 ) 2,310,986 1,185,552 (17,619,890 ) (182,102,035 ) (115,400,740 ) (111,826,228 ) CONTRIBUTION MARGIN 730,959,081 764,667,215 662,921,239 270,950,810 273,431,467 273,999,263 6,281,470 6,048,557 (19,876,921 ) 1,008,191,361 1,044,147,239 917,043,581 Other work performed by the entity and capitalized 7,226,484 9,758,304 15,250,811 6,630,130 6,338,547 5,753,242 532,373 1 — 14,388,987 16,096,852 21,004,053 Employee benefits expense (54,222,470 ) (60,350,072 ) (70,969,357 ) (38,449,551 ) (35,557,457 ) (32,454,962 ) (28,831,756 ) (28,190,899 ) (33,130,402 ) (121,503,777 ) (124,098,428 ) (136,554,721 ) Other expenses (102,821,020 ) (119,303,215 ) (90,327,960 ) (61,942,592 ) (52,077,948 ) (62,182,651 ) 2,939,538 612,026 26,653,214 (161,824,074 ) (170,769,137 ) (125,857,397 ) GROSS OPERATING INCOME 581,142,075 594,772,232 516,874,733 177,188,797 192,134,609 185,114,892 (19,078,375 ) (21,530,315 ) (26,354,109 ) 739,252,497 765,376,526 675,635,516 Depreciation and amortization expense (117,337,553 ) (132,600,381 ) (124,835,559 ) (36,685,324 ) (30,399,304 ) (29,082,449 ) 1,338,771 1,339,075 716,346 (152,684,106 ) (161,660,610 ) (153,201,662 ) Impairment losses (reversal of impairment losses) recognized in profit or loss 55,494 (30,785,531 ) 9,793,653 (7,993,311 ) (5,141,179 ) (6,738,750 ) — — — (7,937,817 ) (35,926,710 ) 3,054,903 OPERATING INCOME 463,860,016 431,386,320 401,832,827 132,510,162 156,594,126 149,293,693 (17,739,604 ) (20,191,240 ) (25,637,763 ) 578,630,574 567,789,206 525,488,757 FINANCIAL RESULT (36,610,248 ) (35,678,632 ) (114,252,182 ) 6,411,837 8,579,316 12,294,531 7,783,757 6,616,146 4,088,867 (22,414,654 ) (20,483,170 ) (97,868,784 ) Financial income 5,273,672 6,150,751 234,822 12,894,635 14,289,185 13,308,032 3,494,381 2,665,965 1,727,315 21,662,688 23,105,901 15,270,169 Cash and cash equivalents 3,077,708 2,150,797 152,518 1,975,564 1,680,365 634,961 3,323,751 — 1,778,538 8,377,023 3,831,162 2,566,017 Other financial income 2,195,964 3,999,954 82,304 10,919,071 12,608,820 12,673,071 170,630 2,665,965 (51,223 ) 13,285,665 19,274,739 12,704,152 Financial costs (50,851,829 ) (55,701,778 ) (64,206,719 ) (7,094,366 ) (6,488,659 ) (1,801,829 ) 4,435,313 3,991,055 (692,150 ) (53,510,882 ) (58,199,382 ) (66,700,698 ) Bank borrowings (261 ) (2,033,835 ) (129,350 ) (12,299 ) (476 ) (1,659 ) (25 ) — (494 ) (12,585 ) (2,034,311 ) (131,503 ) Secured and unsecured obligations (42,708,253 ) (44,268,489 ) (51,697,708 ) — — — — — — (42,708,253 ) (44,268,489 ) (51,697,708 ) Other (8,143,315 ) (9,399,454 ) (12,379,661 ) (7,082,067 ) (6,488,183 ) (1,800,170 ) 4,435,338 3,991,055 (691,656 ) (10,790,044 ) (11,896,582 ) (14,871,487 ) Profit (loss) from indexed assets and liabilities 145,608 606,075 3,600,187 761,262 974,891 973,087 9,796 50,874 265,803 916,666 1,631,840 4,839,077 Foreign currency exchange differences 8,822,301 13,266,320 (53,880,472 ) (149,694 ) (196,101 ) (184,759 ) (155,733 ) (91,748 ) 2,787,899 8,516,874 12,978,471 (51,277,332 ) Positive 19,563,838 48,546,664 26,738,738 58,288 609,359 (235,571 ) 134,942 65,643 3,930,935 19,757,068 49,221,666 30,434,102 Negative (10,741,537 ) (35,280,344 ) (80,619,210 ) (207,982 ) (805,460 ) 50,812 (290,675 ) (157,391 ) (1,143,036 ) (11,240,194 ) (36,243,195 ) (81,711,434 ) Share of profit of associates accounted for using the equity method (2,696,904 ) 7,878,201 8,905,045 — 1,818 5,248 — (1,819 ) (5,248 ) (2,696,904 ) 7,878,200 8,905,045 Other gains (losses) 113,088,869 121,490,974 4,015,401 157,458 (831 ) 14,660,351 (5,131 ) (81 ) 1,379,993 113,241,196 121,490,062 20,055,745 Gain (loss) from other investments 105,462,769 121,457,430 4,309,205 4,026 (831 ) — (5,131 ) (81 ) (346 ) 105,461,664 121,456,518 4,308,859 Gain (loss) from the sale of property, plant and equipment 7,626,100 33,544 (293,804 ) 153,432 — 14,660,351 — — 1,380,339 7,779,532 33,544 15,746,886 Income before tax 537,641,733 525,076,863 300,501,091 139,079,457 165,174,429 176,253,823 (9,960,978 ) (13,576,994 ) (20,174,151 ) 666,760,212 676,674,298 456,580,763 Income tax (112,099,519 ) (83,216,935 ) (76,655,819 ) (34,030,322 ) (32,589,362 ) (36,956,051 ) 2,787,540 4,403,115 3,999,271 (143,342,301 ) (111,403,182 ) (109,612,599 ) Net income from continuing operations 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income from discontinued operations — — — — — — — — — — — — NET INCOME 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Net income attributable to: 425,542,214 441,859,928 223,845,272 105,049,135 132,585,067 139,297,772 (7,173,438 ) (9,173,879 ) (16,174,880 ) 523,417,911 565,271,116 346,968,164 Shareholders of Enel Chile — — — — — — — — — 349,382,642 384,159,865 251,838,410 Non-controlling interests — — — — — — — — — 174,035,269 181,111,251 95,129,754 Line of Business Generation Distribution Holdings, eliminations and others Total 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 12-31-2017 12-31-2016 12-31-2015 STATEMENT OF CASH FLOWS ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Cash flows from (used in) operating activities 488,157,362 490,177,558 428,211,622 170,628,958 148,354,968 194,756,025 (23,182,620 ) (23,847,670 ) (46,436,120 ) 635,613,720 614,684,856 576,531,527 Cash flows from (used in) investing activities (91,867,647 ) (34,631,759 ) (255,251,615 ) (74,464,531 ) (55,007,620 ) (82,947,418 ) 19,886,401 26,150,787 41,457,686 (146,465,777 ) (63,488,592 ) (296,741,347 ) Cash flows from (used in) financing activities (301,835,211 ) (374,835,378 ) (175,094,207 ) (76,923,085 ) (88,519,047 ) (98,304,569 ) 61,162,775 17,487,453 (43,674 ) (317,595,521 ) (445,866,972 ) (273,442,450 )

Third Party Guarantees, Other82

Third Party Guarantees, Other Contingent Assets and Liabilities, and Other Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Other Provisions [Abstract]
Summary of Indirect Guarantees	Debtor Outstanding balance as of Type Contract Maturity Creditor of Guarantee Company Relationship Type of Guarantee Currency 12-31-2017 12-31-2016 Secured Bonds Serie B October 2028 Bondholders of Enel Américas' Bonds Enel Américas S.A. Entities demerged from original debtor Enersis S.A. (codebtor Enel Chile S.A.) (1) Codebtor USD 31,294 33,449 Total 31,294 33,449 (1) As a result of the Enersis’ Spin-Off and in accordance with the bond indenture, all entities arising from the demerger are liable for the debt, regardless that the payment obligation remains in Enel Américas S.A.

Personnel Figures (Tables)

Personnel Figures (Tables)	12 Months Ended
	Dec. 31, 2017
Number And Average Number Of Employees [Abstract]
Summary of Number of Employees	The Company’s personnel as of December 31, 2017 and 2016, is distributed as follows: December 31, 2017 Country Managers and key executives Professionals and Technicians Staff others Total Annual Average Chile 63 1,747 113 1,923 1,968 Argentina — 23 2 25 25 Total 63 1,770 115 1,948 1,993 December 31, 2016 Country Managers and key executives Professionals and Technicians Staff others Total Annual Average Chile 62 1,709 213 1,984 1,988 Argentina — 24 2 26 27 Total 62 1,733 215 2,010 2,015

Environment (Tables)

Environment (Tables)	12 Months Ended
	Dec. 31, 2017
Environmental Matters [Abstract]
Summary of Environmental Expenses	Environmental expenses for the years ended December 31, 2017, 2016 and 2015, are as follows: 12-31-2017 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations. In progress 6,786 - 6,786 - 6,787 Enel Distribución Chile S.A. Vegetation Control In Redesat This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv. In progress 306,419 - 306,419 - 31/12/2017 306,419 Management Respel Dangerous waste management Finished 265 - 265 - 30/09/2017 265 Environmental management in Ssee Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter. In progress 239,285 - 239,285 18,644 257,929 Consider all the environmental work that is done inside and outside of SSEE, as fumigation, placement and/or repair of rodent baits, irrigation system repair, waste removal, environmental inspections, garden Finished 46,771 - 46,771 - 31/12/2017 46,771 Improvements in the Network M T/Bt Traditional network replacement by protected, concentric, other Finished 3,066,846 3,066,846 - 1,957,246 30/09/2017 5,024,092 Environmental Permits Baseline for Environmental Impact Study, execution RCA and normative, preparation of reports and sectoral permits. In progress 68,001 68,001 - 34,811 31/03/2018 102,812 Vegetation Control in Networks Mt/Bt Pruning of trees near the media network and low voltage. In progress 3,313,454 - 3,313,454 - 31/12/2017 3,313,454 Noise Control Noise measurement and electromagnetic fields in substation, lines and other facilities. In progress 786 - 786 - 31/12/2017 786 Asbestos Removal from Underground Cables Removal of fireproof tape with asbestos from the underground network MT. In progress 166,434 166,434 - 37,290 31/12/2017 203,724 Arborizations of Substations and Sat Line Forest management plans, reforestations, construction and maintenance of tree-lined belts in substation. In progress 251,740 251,740 - 20,390 31/12/2017 272,130 Gas Atacama Chile Environmental monitoring Environmental monitoring with SK Ecología operation and maintenance CEMS. In progress 1,463,204 - 1,463,204 - 1,463,204 Standardization Cems Normalización bodegas, gestión ambiental. In progress 1,021,630 1,021,630 - - 1,021,630 Eolica Canela Environmental expenditures in power plants Water quality analysis and monitoring and Higenization Canela In progress 18,347 - 18,347 - 18,347 Enel Generación Chile S.A. Environmental costs in combined cycle plants The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS. In progress 1,252,355 - 1,252,355 - 1,252,355 Environmental costs in thermal plants Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in thermoelectric plants (C.T.) In progress 870,281 - 870,281 - 870,281 Environmental costs in hydroelectric plants Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in hydroelectric power plants (C.H.) In progress 251,277 - 251,277 - 251,277 Ralco Hydroelectric Plant Reforestation according to the agreement with the Catholic University and Electrification of housing in Ayin Maipu. In progress 5,075,137 5,075,137 - - 5,075,137 Tal Tal Thermal Plant Dejection Nox TalTal: Engineering Civil Works and permits In progress 1,290,133 1,290,133 - - 1,290,133 El Toro Hydroelectric Plant Withdrawal Domestic and Industrial Waste In progress - - - - - Total 18,709,151 10,939,921 7,769,230 2,068,381 20,777,533 12-31-2016 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS). In progress 6,515 - 6,515 - 6,515 Gas Atacama Chile Studies, monitoring and disposal of waste Higenization, waste treatment, pest management and control system. Finished 78,221 - 78,221 - 78,221 Studies, monitoring and laboratory analysis Withdrawal and final disposal of solid waste in Thermal Power Plants In progress 169,743 - 169,743 - 169,743 Plant ZLD (studies) Plant ZLD (studies) Finished 13,470 13,470 - - 13,470 Coal plants Emission standard (Desox y Denox Tarapacá) In progress 27,648,451 27,648,451 - - 27,648,451 Eolica Canela Environmental expenditures in power plants Water quality analysis and monitoring and Higenization Canela In progress 94,770 - 94,770 - 94,770 Enel Generación Chile S.A. Environmental costs in combined cycle plants The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS. In progress 567,616 - 567,616 - 567,616 Environmental costs in thermal plants Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in thermoelectric plants (Thermal Power Plants) In progress 243,264 - 243,264 - 243,264 Environmental costs in hydroelectric plants Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in hydroelectric power plants (HPS) In progress 181,644 - 181,644 - 181,644 Ralco Hydroelectric Plant Plan Ralco: Reforestation according to the Agreement with the Catholic University and Electrification of housing in Ayin Maipu. In progress 4,497,330 4,497,330 - - 4,497,330 Tal Tal Thermal Plant Dejection Nox TalTal: Engineering Civil Works and permits It consists of the pruning of branches until reaching the safety conditions to which the foliage must be left with respect to the drivers. In progress 3,173,813 3,173,813 - - 3,173,813 Enel Distribución Chile S.A. Vegetation Control In Redesat Finished 38,475 - 38,475 - 38,475 Management RESPEL Consider the costs for the removal and treatment of Hazardous Waste (final destination) generated in maintenance activities AT Networks. Finished 1,955 - 1,955 - 1,955 Management RESSOL This activity contemplates the clearing and pruning of the MT / BT distribution networks close to the distribution networks. Finished 761,090 - 761,090 - 761,090 Environmental management in SSEE The service consists of the weeding and control of weeds in electric power substation enclosures in order to keep the enclosures free of weeds, ensuring a good operation of these facilities. Finished 50,686 - 50,686 - 50,686 Improvements in the Network M T/BT Space CAB and Pre-assembled. Finished 289,710 289,710 - - 289,710 Environmental permits Payments will correspond to environmental commitments in the RCA that environmentally authorizes the project: Noise measurements and sectoral permits for the storage of waste Finished 44,259 44,259 - 44,259 Project day Potentiation Line 110 kv Los Almendros, El Salto, Tap Los Dominicos section. In progress 8,856 8,856 - 5,068 30-06-2017 13,924 DGA Studies project "Powering Line 110 kv, Ochagavia-Florida, Section TAP Santa Elena-TAP Macul" and DIA Ochagavia-Florida Section Tap Santa, Tap Macul. Finished 6,150 6,150 - - 6,150 Improvements in the Network M T/BT The service consists in the maintenance of green areas with replacement of species and turf in substation enclosures of Chilectra. Finished 49,907 49,907 49,907 Noise Control This activity contemplates the maintenance of the easement strip of a high voltage line between 34.5 and 500 kv. Finished 513 - 513 - 513 Measurement of noise in Sta Raquel, La Reina, Cisterna and Sta. Maria substations. In progress 12,920 12,920 - - 12,920 Environmental Consulting Environmental Consulting and Calibration of Sonometer. Finished 1,492 - 1,492 - 1,492 Environmental permits Lo Espejo- Ochagavia Line Sectoral Environmental Permit Processing, Lo Espejo-Ochagavia Line, Tap Cisterna section Finished 989 989 - - 989 Total 37,941,840 35,695,948 2,245,891 5,068 37,946,908 12-31-2015 Company Incurring the Cost Name Project Project Status (Finished, In progress) Total Disbursements ThCh$ Amounts Capitalized ThCh$ Expenses ThCh$ Disbursement amount in the future ThCh$ Estimated future disbursement date ThCh$ Total Disbursements ThCh$ Pehuenche Hydroelectric Central Environmental Expenditures Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations. In progress 16,877 - 16,877 - 16,877 Investments in Central Hydroelectric Plants Regularization fuel facilities; Regularization water and sewer system; Regularization collection wells; Fabrication and installation cubits acid spill; Normalization fenced site archeology In process 361,712 361,712 - - 361,712 Enel Distribución Chile S.A. Vegetation Control In Redesat This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv. Finished 79,956 - 79,956 982,347 31/12/2015 1,062,303 Management Respel Dangerous waste management Finished 3,377 - 3,377 - 3,377 Environmental management in Ssee Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter. Finished 112,437 - 112,437 - 112,437 Improvements in the Network M T/Bt Traditional network replacement by protected, concentric, other Finished 1,841,766 1,841,766 - - 1,841,766 Vegetation Control in Networks Mt/Bt Pruning of trees near the media network and low voltage. Finished 930,940 - 930,940 - 930,940 Noise Control Noise measurement and electromagnetic fields in substation, lines and other facilities. Finished 5,710 - 5,710 223,482 31/12/2015 229,192 Compañía Electrica Tarapacá S.A. Waste Studies, monitoring, laboratory analysis and waste disposal retirement Finished 196,060 - 196,060 - 196,060 Waste treatment Removal of non-hazardous household and industrial waste Finished 127,053 - 127,053 - 127,053 Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions Finished 9,624 9,624 - 9,624 Afforestation (RCA) Water Eyes Afforestation (RCA) Water Eyes Finished 27,032 27,032 - 27,032 Eolica Canela Central Environmental expenses Water quality analysis and monitoring and Higenization Canela In progress 11,376 - 11,376 - 11,376 Enel Generación Chile S.A. Central Environmental Costs Waste treatment, sanitation In progress 2,455,575 - 2,455,575 - 2,455,575 CT Bocamina Emissions monitoring, CEMS project, NOX abatement In progress 1,855 1,855 - - 1,855 Cems project Cems C.T. Quintero project, C.T. San Isidro II project and C.T. Tal Tal project In progress 61 61 - - 61 Regularizations C.H. Regularizations C.H. In progress 155,485 155,485 - - 155,485 Regularizations C.H. Ralco Social Afforestation Program and Restorations Palmucho Chenqueco bypass road; Bridge reconstruction Lonquimay. In progress 1,051,017 1,051,017 - - 1,051,017 Total 7,387,913 3,448,552 3,939,361 1,205,829 8,593,742

Summarized Financial Informat85

Summarized Financial Information of Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Subsidiaries [Abstract]
Summary of Financial Information on Subsidiaries	As of December 31, 2017 and 2016, summarized financial information of our principal subsidiaries is as follows: December 31, 2017 Type Statements Current Assets Non-Current Assets Total Assets Current Liabilities Non-Current Liabilities Equity Total Liabilities Revenues Raw Consumables Used Contribution Margin Gross Operating Income Operating Income Financial Results Income before Taxes Income Taxes Profit (Loss) Other Comprehensive Income Total Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Grupo Enel Distribución Chile S.A. Consolidated 261,378,069 893,633,580 1,155,011,649 408,687,866 61,965,918 684,357,865 1,155,011,649 1,333,027,456 (1,062,076,645) 270,950,811 177,188,798 132,510,164 6,411,839 139,079,732 (34,030,322) 105,049,408 1,515,176 106,564,584 Grupo Servicios Informaticos e Inmobiliarios Ltda. Consolidated - - - - - — - - - - (1) (1) - (1) - (1) - (1) Empresa Eléctrica Pehuenche S.A. Separate 35,369,243 186,760,346 222,129,589 38,310,560 48,261,590 135,557,439 222,129,589 152,501,383 (36,289,330) 116,212,053 110,957,039 103,556,904 (395,231) 103,206,672 (26,346,081) 76,860,591 - 76,860,591 Grupo Enel Generación Chile S.A. Consolidated 662,804,359 2,891,657,830 3,554,462,189 543,356,500 1,022,091,737 1,989,013,952 3,554,462,189 1,634,937,088 (903,978,007) 730,959,081 581,142,074 463,860,015 (36,610,248) 537,641,733 (112,099,519) 425,542,214 67,663,516 493,205,730 Grupo GasAtacama Chile S.A.. Consolidated 182,143,224 611,319,090 793,462,314 75,370,131 83,894,880 634,197,303 793,462,314 307,272,380 (170,752,796) 136,519,583 106,213,750 70,509,184 1,432,674 80,142,531 (25,417,139) 54,725,392 (3,338,115) 51,387,277 December 31, 2016 Type Statements Current Assets Non-Current Assets Total Assets Current Liabilities Non-Current Liabilities Equity Total Liabilities Revenues Raw Consumables Used Contribution Margin Gross Operating Income Operating Income Financial Results Income before Taxes Income Taxes Profit (Loss) Other Comprehensive Income Total Comprehensive Income ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Grupo Enel Distribución Chile S.A. Consolidated 245,122,732 829,203,115 1,074,325,847 259,684,836 106,283,505 708,357,506 1,074,325,847 1,315,760,851 (1,042,329,385) 273,431,466 192,134,608 156,594,125 8,579,317 165,174,429 (32,589,362) 132,585,067 (21,284,665) 111,300,402 Grupo Servicios Informaticos e Inmobiliarios Ltda. Consolidated 57,558,313 11,654,352 69,212,665 6,711,190 1,466,867 61,034,608 69,212,665 10,983,012 — 10,983,012 (674,755) (736,519) 2,565,301 1,828,782 (107,413) 1,721,370 — 1,721,370 Empresa Eléctrica Pehuenche S.A. Separate 35,730,340 193,496,141 229,226,481 43,012,321 50,044,060 136,170,100 229,226,481 155,568,982 (23,529,448) 132,039,534 125,454,246 116,789,055 24,333 116,813,388 (28,202,602) 88,610,786 — 88,610,786 Compañĺa Eléctrica Tarapacá S.A. Separate — — — — — — — 219,980,554 (139,960,874) 80,019,680 62,455,761 36,937,980 (2,519,836) 51,585,349 10,396,319 61,981,668 (924,812) 61,056,856 Grupo Enel Generación Chile S.A. Consolidated 543,372,956 2,856,309,537 3,399,682,493 555,777,465 1,114,144,776 1,729,760,252 3,399,682,493 1,659,727,329 (895,060,114) 764,667,215 594,772,233 431,386,321 (35,678,633) 525,076,864 (83,216,935) 441,859,929 (86,682,199) 355,177,730 Grupo GasAtacama Chile S.A.. Consolidated 194,264,349 663,665,991 857,930,340 86,380,336 89,573,088 681,976,916 857,930,340 173,489,754 (87,098,923) 86,390,831 67,795,883 45,426,269 6,453,677 53,666,618 (10,337,536) 43,329,082 (1,779,413) 41,549,669

Appendix 1 Enel Chile Group S86

Appendix 1 Enel Chile Group Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Subsidiaries [Abstract]
Schedule of Percentage of Control in Subsidiaries	This appendix is part of Note 2.4, “Subsidiaries”. It discloses the Group’s percentage of control in each company. Percentage of control at 12/31/2017 Percentage of control at 12/31/2016 Taxpayer ID No. Company Currency Direct Indirect Total Direct Indirect Total Type of Relationship Country Activity 76.003.204-2 Central Eólica Canela S.A. Chilean peso - - - — 75.00 % 75.00 % Subsidiary Chile Promotion and development of renewable energy projects 96.800.570-7 Enel Distribución Chile S.A. Chilean peso 99.09 % - 99.09 % 99.08 % 0.01 % 99.09 % Subsidiary Chile Ownership interest in companies of any nature 96.783.910-8 Empresa Eléctrica de Colina Ltda. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Complete energy cycle and related supplies 96.504.980-0 Empresa Eléctrica Pehuenche S.A. Chilean peso - 92.65 % 92.65 % — 92.65 % 92.65 % Subsidiary Chile Complete electric energy cycle 91.081.000-6 Enel Generación Chile S.A. Chilean peso 59.98 % - 59.98 % 59.98 % — 59.98 % Subsidiary Chile Complete electric energy cycle 78.932.860-9 GasAtacama Chile S.A. (1) Chilean peso 2.63 % 97.37 % 100.00 % 2.63 % 97.37 % 100.00 % Subsidiary Chile Company management 78.952.420-3 Gasoducto Atacama Argentina S.A. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Natural gas exploitation and transportation 76.107.186-6 Servicios Informáticos e Inmobiliarios Ltda. Chilean peso - - - 99.00 % 1.00 % 100.00 % Subsidiary Chile Information Technology services 96.800.460-3 Luz Andes Ltda. Chilean peso - 100.00 % 100.00 % — 100.00 % 100.00 % Subsidiary Chile Energy and fuel transportation, distribution and sales 76.722.488-5 Empresa de Transmisión Chena S.A Chilean peso - 100.00 % 100.00 % — — — Subsidiary Chile Energy distribution 77.047.280-6 Sociedad Agrícola de Cameros Ltda. Chilean peso 57.50 % - 57.50 % — 57.50 % 57.50 % Subsidiary Chile Financial investments (1) On November 1, 2016, Compañia Eléctrica Tarapacá was merged in and with GasAtacama Chile S.A., being the latter the surviving company.

Appendix 2 Changes in the Sco87

Appendix 2 Changes in the Scope of Consolidation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Scope Of Consolidation [Abstract]
Summary of Companies Incorporated Into the Scope of Consolidation	The companies incorporated into the scope of consolidation, are as follows: Percentage of control at 12/31/2017 Percentage of control at 12/31/2016 Company Direct Indirect Total Direct Indirect Total Empresa de Trasmisión Chena S.A. — 100.00 % 100.00 % — — —
Summary of Companies Eliminated From the Scope of Consolidation	Companies eliminated from the scope of consolidation: December 31, 2017 December 31, 2016 Ownership Interest Ownership Interest Company Direct Indirect Total Consolidation Method Direct Indirect Total Consolidation Method Gasoducto TalTal S.A. - - - Full integration — 100.00% 100.00% Full integration GNL Norte S.A. - - - Full integration — 100.00% 100.00% Full integration Progas S.A. - - - Full integration — 100.00% 100.00% Full integration GNL Quintero S.A. - - - Equity method — 20.00% 20.00% Equity method Compañía Eléctrica Tarapacá S.A. - - - Full integration 3.78 % 96.21% 99.99% Full integration Inversiones GasAtacama Holding Ltda. - - - Full integration — 100.00% 100.00% Full integration GasAtacama S.A. - - - Full integration — 100.00% 100.00% Full integration Electrogas (1) - 42.50% 42.50% Equity method — — — Equity method Servicios Informáticos e Inmobiliarios Ltda. (2) 99.90 % 0.10% 100.00% Full integration — — — Full integration Central Eólica Canela S.A. (3) - 75.00% 75.00% Full integration — — — Full integration (1) See note 5. (2) On September 1, 2017, this Company entity was merged with by Enel Chile, with the latter being the legal surviving entity. (3) On December 22, 2017, this entity was liquidated and Company was wound up with its assets being were transferred to Gasatacama Chile.

Appendix 3 Associates and Joi88

Appendix 3 Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Investments In Associates And Joint Ventures [Abstract]
Summary of Investments Accounted for Using the Equity Method	This appendix is part of Note 3.i, “Investments accounted for using the Equity Method”. Ownership Interest at 12/31/2017 Ownership Interest at 12/31/2016 Taxpayer ID No. Company Currency Direct Indirect Total Direct Indirect Total Type of Relationship Country Activity 96.806.130-5 Electrogas S.A. (1) U.S. dollar — — — — 42.50% 42.50% Associate Chile Portfolio company 76.418.940-K GNL Chile S.A. U.S. dollar — 33.33% 33.33% — 33.33% 33.33% Associate Chile Promotion of liquefied natural gas supply project 76.652.400-1 Centrales Hidroeléctricas De Aysén S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 76.041.891-9 Aysén Transmisión S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 76.091.595-5 Aysén Energía S.A. Chilean peso — 51.00% 51.00% — 51.00% 51.00% Joint venture Chile Development and operation of a hydroelectric plant 77.017.930-0 Transmisora Eléctrica de Quillota Ltda. Chilean peso — 50.00% 50.00% — 50.00% 50.00% Joint venture Chile Electric energy transportation and distribution (1) See Note 5.

Appendix 4 Additional Informa89

Appendix 4 Additional Information on Financial Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Financial Liabilities [Line Items]
Summary of Bank Loans by Currency and Maturity	Bank loans by currency and contractual maturity as of December 31, 2017 and 2016, are as follows: Summary of bank loans by currency and maturity Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 122 — 122 — — — — — — Total 122 — 122 — — — — — — Current Non-current Maturity Maturity Effective Interest Nominal Interest Secured/ One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years Over five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 6.00% Unsecured 4,274 — 4,274 — — — — — — Total 4,274 — 4,274 — — — — — —
Summary of Identification of Bank Borrowings by Company	Identification of bank borrowings by company Appendix No.4, letter a), presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the bank loans detailed above. December 31, 2017 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Amortization Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.006.000-6 Banco de Crédito e Inversiones Chile Ch$ 6.00% 6.00% At maturity 2,037 — 2,037 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile 97.036.000-K Banco Santander Chile Ch$ 6.00% 6.00% At maturity 2,135 — 2,135 — — — — — — Total 4,274 — 4,274 — — — — — —
Summary of Unsecured Liabilities by Currency and Maturity	The detail of Unsecured Liabilities by currency and maturity as of December 31, 2017 and 2016, is as follows: Summary of unsecured liabilities by currency and maturity Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2017 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,322,081 2,206,269 8,528,350 — — — — 430,228,859 430,228,859 Chile U.F. 6.00% 5.48% Unsecured — 6,927,432 6,927,432 5,574,013 5,574,013 5,574,013 5,574,013 295,598,892 317,894,944 Total 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 Current Non-Current Maturity Maturity Effective Interest Nominal Annual Secured/ One to three months Three to Twelve months Total Current 12/31/2015 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current 12/31/2016 Country Currency Rate Rate Unsecured ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.99% 6.90% Unsecured 6,884,819 2,402,653 9,287,472 — — — — 468,578,474 468,578,474 Chile U.F. 6.00% 5.48% Unsecured — 6,881,001 6,881,001 5,480,380 5,480,380 5,480,380 5,480,380 295,637,694 317,559,214 Total 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688
Summary of Unsecured Liabilities by Company	Identification of unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,152,926 — 4,152,926 — — — — 125,566,611 125,566,611 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,328,023 — 1,328,023 — — — — 42,902,198 42,902,198 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 841,132 — 841,132 — — — — 19,398,499 19,398,499 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,206,269 2,206,269 — — — — 242,361,551 242,361,551 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,374,051 6,374,051 5,574,013 5,574,013 5,574,013 5,574,013 30,872,536 53,168,588 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% No — 553,381 553,381 — — — — 264,726,356 264,726,356 Total Unsecured Bonds 6,322,081 9,133,701 15,455,782 5,574,013 5,574,013 5,574,013 5,574,013 725,827,751 748,123,803 December 31, 2016 Current Non-Current Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Secured Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon -Primera Emisión S-1 USA US$ 7.96% 7.88% No 4,522,585 — 4,522,585 — — — — 136,759,395 136,759,395 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-2 USA US$ 7.40% 7.33% No 1,446,232 — 1,446,232 — — — — 46,792,429 46,792,429 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Primera Emisión S-3 USA US$ 8.26% 8.13% No 916,002 — 916,002 — — — — 21,608,757 21,608,757 91.081.000-6 Enel Generación Chile S.A. Chile Foreign BNY Mellon - Única 24296 USA US$ 4.32% 4.25% No — 2,402,653 2,402,653 — — — — 263,417,893 263,417,893 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% No — 6,337,021 6,337,021 5,480,380 5,480,380 5,480,380 5,480,380 35,587,764 57,509,284 91.081.000-6 Enel Generación Chile S.A. Chile 97.004.000-5 Banco Santander 522 Serie-M (*) Chile U.F. 4.82% 4.75% No — 543,980 543,980 — — — — 260,049,930 260,049,930 Total Unsecured Bonds 6,884,819 9,283,654 16,168,473 5,480,380 5,480,380 5,480,380 5,480,380 764,216,168 786,137,688
Summary of Detail of Finance Lease Obligations	18.4 Appendix No. 4 letter c) presents details of estimated future cash flows (undiscounted) that the Group will have to disburse to settle the finance lease obligations detailed above. December 31, 2017 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 Total Leasing 439,377 1,360,411 1,799,788 2,459,000 1,916,774 2,041,364 2,174,053 4,217,935 12,809,126 December 31, 2016 Current Non-Current ThCh$ Taxpayer ID Number Company Country Taxpayer ID Number Financial Institution Country Currency Nominal Interest Rate Less than 90 days ThCh$ More than 90 days ThCh$ Total Current ThCh$ One to two years ThCh$ Two to three years ThCh$ Three to four years ThCh$ Four to five years ThCh$ More than five years ThCh$ Total Non-Current ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.555.400-4 Transelec S.A. Chile US$ 6.50% 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280 Total Leasing 449,283 1,391,084 1,840,367 2,677,880 2,677,880 1,959,990 2,087,390 6,506,140 15,909,280
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Summary of Bank Loans by Currency and Maturity	1. Summary of bank borrowings by currency and maturity Current Non-current Current Non-current Maturity Maturity Maturity Maturity Country Currency Nominal Interest Rate One to three months Three to twelve months Total Current 12/31/2017 One to two years Two to three years Three to four years Four to five years More than five years Total Non- Current 12/31/2017 One to three months Three to twelve months Total Current 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non- Current 12/31/2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile Ch$ 6.00% 122 — 122 — — — — — — 4,283 — 4,283 — — — — — — Total 122 — 122 — — — — — — 4,283 — 4,283 — — — — — —
Summary of Identification of Bank Borrowings by Company	2. Identification of bank borrowings by company December 31, 2017 Current Non-current Taxpayer ID No. Company Country Financial Institution Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile Banco de Crédito e Inversiones Ch$ 6.00% 6.00% 13 — 13 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco de Crédito e Inversiones US$ 6.00% 6.00% 97 — 97 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander Ch$ 6.00% 6.00% 12 — 12 — — — — — — Total 122 — 122 — — — — — — December 31, 2016 Current Non-current Taxpayer ID No. Company Country Financial Institution Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 96.800.570-7 Enel Distribución Chile S.A. Chile Banco de Crédito e Inversiones Ch$ 6.00% 6.00% 102 — 102 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco de Crédito e Inversiones US$ 6.00% 6.00% 2,048 — 2,048 — — — — — — 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander Ch$ 6.00% 6.00% 2,133 — 2,133 — — — — — — Total 4,283 — 4,283 — — — — — —
Summary of Unsecured Liabilities by Currency and Maturity	b) Secured and unsecured liabilities 1. Summary of secured and unsecured liabilities by currency and maturity Current Non-current Current Non-current Maturity Maturity Maturity Maturity Country Currency Nominal Interest Rate One to three months Three to twelve months Total Current at 12/31/2017 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current at 12/31/2017 One to three months Three to twelve months Total Current at 12/31/2016 One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current at 12/31/2016 ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Chile US$ 6.90% 6,697,979 20,093,935 26,791,914 26,791,913 26,791,913 26,791,913 26,791,913 568,727,913 675,895,565 7,264,786 21,794,359 29,059,145 29,059,146 29,059,146 29,059,146 29,059,146 641,348,382 757,584,966 Chile U.F. 5.48% 5,775,038 22,689,438 28,464,476 51,927,014 49,837,566 47,748,117 45,658,669 256,892,562 452,063,928 6,466,160 24,665,200 31,131,360 30,632,431 53,611,843 51,316,337 49,020,830 305,390,728 489,972,169 Total 12,473,017 42,783,373 55,256,390 78,718,927 76,629,479 74,540,030 72,450,582 825,620,475 1,127,959,493 13,730,946 46,459,559 60,190,505 59,691,577 82,670,989 80,375,483 78,079,976 946,739,110 1,247,557,135
Summary of Unsecured Liabilities by Company	2. Secured and unsecured liabilities by company December 31, 2017 Current Non-Current Taxpayer ID No. Company Country Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-1 U.S.A. US$ 7.96% 7.88% 2,612,406 7,837,217 10,449,623 10,449,623 10,449,623 10,449,623 10,449,623 170,108,928 211,907,420 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-2 U.S.A. US$ 7.40% 7.33% 833,743 2,501,229 3,334,972 3,334,972 3,334,972 3,334,972 3,334,972 86,312,007 99,651,895 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-3 U.S.A. US$ 8.26% 8.13% 530,161 1,590,483 2,120,644 2,120,644 2,120,644 2,120,644 2,120,644 51,884,633 60,367,209 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Unica 24296 U.S.A. US$ 4.32% 4.25% 2,721,669 8,165,006 10,886,675 10,886,674 10,886,674 10,886,674 10,886,674 260,422,345 303,969,041 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% 1,414,018 9,606,378 11,020,396 10,516,773 10,013,150 9,509,527 9,005,904 44,726,323 83,771,677 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% 4,361,020 13,083,060 17,444,080 41,410,241 39,824,416 38,238,590 36,652,765 212,166,239 368,292,251 Total 12,473,017 42,783,373 55,256,390 78,718,927 76,629,479 74,540,030 72,450,582 825,620,475 1,127,959,493 December 31, 2016 Current Non-Current Taxpayer ID No. Company Country Financial Institution Country Currency Effective Interest Rate Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-1 U.S.A. US$ 7.96% 7.88% 2,832,647 8,497,942 11,330,589 11,330,590 11,330,590 11,330,590 11,330,590 196,227,387 241,549,747 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera EmisiónS-2 U.S.A. US$ 7.40% 7.33% 903,234 2,709,703 3,612,937 3,612,937 3,612,937 3,612,937 3,612,937 93,701,216 108,152,964 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Primera Emisión S-3 U.S.A. US$ 8.26% 8.13% 574,765 1,724,294 2,299,059 2,299,059 2,299,059 2,299,059 2,299,059 56,341,806 65,538,042 91.081.000-6 Enel Generación Chile S.A. Chile BNY Mellon - Única 24296 U.S.A. US$ 4.32% 4.25% 2,954,140 8,862,420 11,816,560 11,816,560 11,816,560 11,816,560 11,816,560 295,077,973 342,344,213 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander -317 Serie-H Chile U.F. 7.17% 6.20% 1,525,571 9,843,433 11,369,004 10,870,075 10,371,146 9,872,218 9,373,289 52,887,199 93,373,927 91.081.000-6 Enel Generación Chile S.A. Chile Banco Santander 522 Serie-M Chile U.F. 4.82% 4.75% 4,940,589 14,821,767 19,762,356 19,762,356 43,240,697 41,444,119 39,647,541 252,503,529 396,598,242 Total 13,730,946 46,459,559 60,190,505 59,691,577 82,670,989 80,375,483 78,079,976 946,739,110 1,247,557,135
Summary of Detail of Finance Lease Obligations	1. Financial lease obligations by company December 31, 2017 Current Non-Current Taxpayer ID No. Company Country Taxpayer ID No. Financial Institution Country Currency Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.556.400-4 Transelec S.A. Chile US$ 6.50% 685,232 2,052,448 2,737,680 2,728,693 2,719,123 2,708,931 2,698,076 4,473,883 15,328,706 Total 685,232 2,052,448 2,737,680 2,728,693 2,719,123 2,708,931 2,698,076 4,473,883 15,328,706 December 31, 2016 Current Non-Current Taxpayer ID No. Company Country Taxpayer ID No. Financial Institution Country Currency Nominal Interest Rate Less than 90 days More than 90 days Total Current One to two years Two to three years Three to four years Four to five years More than five years Total Non-Current ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ 91.081.000-6 Enel Generación Chile S.A. Chile 76.556.400-4 Transelec S.A. Chile US$ 6.50% 734,006 2,200,827 2,934,833 2,931,533 2,928,019 2,924,276 2,920,289 7,777,314 19,481,431 Total 734,006 2,200,827 2,934,833 2,931,533 2,928,019 2,924,276 2,920,289 7,777,314 19,481,431

Appendix 5 Details of Assets 90

Appendix 5 Details of Assets and Liabilities in Foreign Currency (Tables)	12 Months Ended
	Dec. 31, 2017
Text Block1 [Abstract]
Summary of Assets and Liabilities Denominated in Foreign Currencies	The detail of assets and liabilities denominated in foreign currencies is the following: 12-31-2017 12-31-2016 ASSETS Foreign Currency ThCh$ ThCh$ Cash and cash equivalents 419,456,026 245,999,192 U.S. dollar 14,016,336 5,198,139 Euros 11,594 — Argentine peso 6,263,345 4,807,406 Chilean peso non-adjustable 399,164,751 235,993,647 Other current financial assets 20,627,062 584,244 U.S. dollar 20,441,150 422,705 Chilean peso non-adjustable 185,912 132,468 U.F. — 29,071 Other current non- financial assets 6,002,142 15,831,486 U.S. dollar 902,026 65,138 Argentine peso 32,621 57,145 Chilean peso non-adjustable 5,067,495 15,709,203 Trade and other current receivables 419,752,286 445,071,856 U.S. dollar 5,273,104 — Argentine peso 1,073,072 931,882 Chilean peso non-adjustable 412,267,621 443,032,735 U.F. 1,138,489 1,107,239 Current accounts receivable from related companies 71,856,046 52,858,384 U.S. dollar 22,793,820 16,780,275 Euros 42,663,049 424,692 Real 36,276 Colombian peso 1,627,495 Soles 15,192 Chilean peso non-adjustable 6,399,177 33,974,454 Inventories 39,686,942 37,539,596 Chilean peso non-adjustable 39,686,942 37,539,596 Current tax assets 77,756,048 55,649,171 Argentine peso 146,525 302,528 Chilean peso non-adjustable 77,609,523 55,346,643 Non- current assets or disposal group held for sale — 12,993,008 Chilean peso non-adjustable — 12,993,008 Non- current assets or disposal group held for distribution to owners 4,205,233 — Chilean peso non-adjustable 4,205,233 — TOTAL CURRENT ASSETS 1,059,341,785 866,526,937 NON-CURRENT ASSETS Foreign Currency 12-31-2017 12-31-2016 Other non-current financial assets 33,418,204 28,827,542 U.S. dollar 30,789,705 26,185,923 Chilean peso non-adjustable 2,628,499 2,641,619 Other non-current non-financial assets 13,813,139 13,336,152 U.S. dollar 322,744 - Argentine peso 378,940 303,837 Chilean peso non-adjustable 12,326,385 12,241,662 U.F. 785,070 790,653 Trade and other non-current receivables 36,182,399 33,500,105 Argentine peso 62,563 27,567 Chilean peso non-adjustable 25,228,146 21,948,173 U.F. 10,891,690 11,524,365 Investments accounted for using the equity method 12,707,221 18,738,198 U.S. dollar 3,783,316 3,982,934 Argentine peso 105,151 91,335 Chilean peso non-adjustable 8,818,754 14,663,929 Intangible assets other than goodwill 55,170,904 44,470,750 Argentine peso 253,849 194,529 Chilean peso non-adjustable 54,917,055 44,276,221 Goodwill 887,257,655 887,257,655 Chilean peso non-adjustable 887,257,655 887,257,655 Property, plant and equipment 3,585,687,137 3,476,128,634 Argentine peso 15,450,783 16,039,114 Chilean peso non-adjustable 3,570,236,354 3,460,089,520 Investment property 8,356,772 8,128,522 Chilean peso non-adjustable 8,356,772 8,128,522 Deferred tax assets 2,837,792 21,796,517 Chilean peso non-adjustable 2,837,792 21,796,517 TOTAL NON-CURRENT ASSETS 4,635,431,223 4,532,184,075 TOTAL ASSETS 5,694,773,008 5,398,711,012 12-31-2017 12-31-2016 LIABILITIES Less than 90 days More than 90 days Less than 90 days More than 90 days Foreign Currency ThCh$ ThCh$ ThCh$ ThCh$ Other Current financial liabilities 7,999,866 10,815,582 15,021,428 10,674,738 U.S. dollar 7,999,743 3,888,150 15,017,154 3,793,737 Chilean peso non-adjustable 123 — 4,274 — U.F. — 6,927,432 — 6,881,001 Trade and other current payables 590,848,682 3,649,924 561,505,283 — U.S. dollar 16,184,962 — 9,463,287 — Euros 3,174,586 — 1,384,882 — Argentine peso 732,777 — 970,255 — Chilean peso non-adjustable 570,756,357 3,649,924 549,686,859 — Current accounts payable to related parties 119,538,232 — 90,428,929 — U.S. dollar 9,090,837 — 4,936,256 — Euros 28,830,246 — 841,934 — Colombian peso 12,487 — 5,461 — Soles 2,110 — 2,239 — Chilean peso non-adjustable 81,602,552 — 84,643,039 — Other current provisions 384,955 5,251,216 6,493,532 — Argentine peso 45,419 — 20,859 — Chilean peso non-adjustable 339,536 5,251,216 6,472,673 — Current tax liabilities 904,248 66,123,259 7,966,008 53,633,407 Argentine peso 146,769 — — — Chilean peso non-adjustable 757,479 66,123,259 7,966,008 53,633,407 Other current non-financial liabilities — 11,225,942 23,330 11,499,992 Chilean peso non-adjustable — 11,225,942 23,330 11,499,992 12-31-2017 12-31-2016 LIABILITIES Foreign Currency One to five years More than five years One to five years More than five years ThCh$ ThCh$ ThCh$ ThCh$ Other non-current financial liabilities 51,932,458 730,045,687 83,294,443 770,722,308 U.S. dollar 29,636,407 434,446,795 61,372,923 475,084,614 U.F. 22,296,051 295,598,892 21,921,520 295,637,694 Trade and other non-current payables 659,824 - 1,483,113 - U.S. dollar 947 - - - Euro - - 29,952 - Argentine peso 173,343 - 887,668 - Chilean peso non-adjustable 485,534 - 565,493 - Current account payable to related parties 318,518 - 251,527 - Euros 318,518 - - - Chilean peso non-adjustable - - 251,527 - Other long-term provisions 52,318 78,370,519 17,912,846 45,194,062 Chilean peso non-adjustable 52,318 78,370,519 17,912,846 45,194,062 Deferred tax liabilities 55,844,982 116,378,699 66,412,315 132,952,479 Argentine peso 4,459,081 - 3,751,112 - Chilean peso non-adjustable 51,385,901 116,378,699 62,661,203 132,952,479 Non- current provisions for employee benefits 3,434,185 53,647,739 3,683,376 56,250,751 Chilean peso non-adjustable 3,434,185 53,647,739 3,683,376 56,250,751 Other non-current non financial liabilities 309,776 - 313,503 - Chilean peso non-adjustable 309,776 - 313,503 - TOTAL NON-CURRENT LIABILITIES 112,552,061 978,442,644 173,351,123 1,005,119,600 TOTAL LIABILITIES 832,302,784 1,075,508,567 854,789,633 1,080,927,737

Appendix 6 Additional Informa91

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 (Tables)	12 Months Ended
	Dec. 31, 2017
Trade And Other Receivables [Abstract]
Summary of Aging of Trade and Other Receivables	• Trade and other receivables by aging: As of December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Total Non-Current Trade and Other Receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, gross 291,417,828 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 54,604,283 415,039,522 1,917,828 Allowance for doubtful accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (32,270,098 ) (34,660,196 ) — Other receivables, gross 39,372,960 — — — — — — — — 9,213,863 48,586,823 34,264,571 Allowance for doubtful accounts — — — — — — — — — (9,213,863 ) (9,213,863 ) — Total 330,701,026 33,399,262 17,293,165 3,796,047 1,965,584 4,388,548 2,654,063 1,556,493 1,663,913 22,334,185 419,752,286 36,182,399 As of December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Total Non-Current Trade and Other Receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, gross 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 63,349,580 414,184,116 8,369,878 Allowance for doubtful accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (29,672,710 ) (31,696,816 ) — Other receivables, gross 62,584,556 — — — — — — — — 7,765,064 70,349,620 25,130,227 Allowance for doubtful accounts — — — — — — — — — (7,765,064 ) (7,765,064 ) — Total 342,836,256 33,897,290 14,268,110 4,094,395 2,155,961 5,872,964 2,766,214 1,360,066 4,143,730 33,676,870 445,071,856 33,500,105
Summary of Trade and Other Receivables by Type of Portfolio	• By type of portfolio: December 31, 2017 December 31, 2016 Non-renegotiated Portfolio Renegotiated Portfolio Total Gross Portfolio Non-renegotiated Portfolio Renegotiated Portfolio Total Gross Portfolio Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Number of Customers Gross Amount Aging of balances ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Current 1,145,472 288,681,858 52,679 4,653,798 1,198,151 293,335,656 1,157,940 281,705,071 60,278 5,850,339 1,218,218 287,555,410 1 to 30 days 451,929 30,202,328 22,869 3,428,065 474,798 33,630,393 414,617 30,167,962 22,459 3,951,138 437,076 34,119,100 31 to 60 days 133,114 15,573,493 8,780 1,933,127 141,894 17,506,620 107,539 12,724,070 8,312 1,756,446 115,851 14,480,516 61 to 90 days 22,305 3,228,258 2,795 767,886 25,100 3,996,144 18,344 3,813,933 2,128 448,919 20,472 4,262,852 91 to 120 days 9,505 1,817,086 1,422 372,319 10,927 2,189,405 8,987 1,978,892 1,049 286,640 10,036 2,265,532 121 to 150 days 7,118 4,216,619 1,093 348,718 8,211 4,565,337 5,866 5,753,020 656 230,854 6,522 5,983,874 151 to 180 days 5,333 2,526,954 699 334,627 6,032 2,861,581 4,671 2,415,755 442 525,184 5,113 2,940,939 181 to 210 days 10,103 2,127,005 446 343,968 10,549 2,470,973 20,001 2,016,444 275 109,839 20,276 2,126,283 211 to 250 days 3,979 1,599,571 394 197,387 4,373 1,796,958 3,535 4,163,062 217 83,669 3,752 4,246,731 More than 251 days 125,590 48,307,224 5,593 6,297,059 131,183 54,604,283 123,301 60,447,048 3,613 4,125,709 126,914 64,572,757 Total 1,914,448 398,280,396 96,770 18,676,954 2,011,218 416,957,350 1,864,801 405,185,257 99,429 17,368,737 1,964,230 422,553,994
Summary of Portfolio in Default and in Legal Collection Process of Notes Receivable	b) Portfolio in default and in legal collection process As of December 31, 2017 2016 Number of Amount Number of Amount Portfolio in Default and in Legal Collection Process Customers ThCh$ Customers ThCh$ Notes receivable in default 1,902 259,560 1,949 262,912 Notes receivable in legal collection process (*) 2,744 6,041,670 3,608 7,049,869 Total 4,646 6,301,230 5,557 7,312,781 (*) Legal collections are included in the portfolio in arrears.
Summary of Provisions and Write-offs Portfolio	c) Provisions and write-offs As of December 31, 2017 2016 Provisions and Write-offs ThCh$ ThCh$ Provision for non-renegotiated portfolio 7,928,877 4,919,244 Provision for renegotiated portfolio 8,940 (746,953 ) Total 7,937,817 4,172,291
Summary of Number and Value of Operations	d) Number and value of operations December 31, 2017 December 31, 2016 Total detail by type of operation Total detail by type of operation Total detail by type of operation Total detail by type of operation Number and Value of Operations Last Quarter Year-to-date Last Quarter Year-to-date Impairment provisions and recoveries: Number of operations 5,376 46,484 11,092 1,949,771 Value of operations, in ThCh$ 4,058,212 7,937,817 74,563 4,172,291
Trade Receivables by Aging	• Trade receivables by aging: December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days More than 365 days Total Current Total Non- Current Trade and other current receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, generation 186,769,753 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 195,570,350 62,563 - Large customers 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 195,525,065 - - Institutional customers - — — — — - - - - - - - - - Others 45,285 — — — — - - - - - - 45,285 62,563 Allowance for doubtful accounts - — — — — - - - - (1,103,086 ) (155,731 ) (1,258,817 ) - Unbilled services 138,781,170 — — — — — — — — — — 138,781,170 — Services billed 47,988,583 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 1,596,976 2,519,064 56,789,180 62,563 Trade receivables, distribution 104,648,075 30,572,399 17,173,541 3,717,044 2,179,384 4,523,322 2,527,283 2,071,421 1,568,460 4,286,717 46,201,526 219,469,172 1,855,265 - Mass-market customers 84,591,816 22,148,005 10,699,951 2,264,627 1,657,978 1,231,644 918,357 1,700,605 567,152 1,808,646 25,341,852 152,930,633 1,781,421 - Large customers 17,771,942 6,565,888 4,987,871 940,754 168,838 1,809,919 357,379 30,481 7,237 1,295,122 12,333,224 46,268,655 — - Institutional customers 2,284,317 1,858,506 1,485,719 511,663 352,568 1,481,759 1,251,547 340,335 994,071 1,182,949 8,526,450 20,269,884 73,844 Allowance for doubtful accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (877,621 ) (30,133,660 ) (33,401,379 ) — Unbilled services 77,733,438 — — — — — — — — — — 77,733,438 — Services billed 26,914,637 30,572,399 17,173,541 3,717,044 2,179,384 4,523,322 2,527,283 2,071,421 1,568,460 4,286,717 46,201,526 141,735,734 1,855,265 Total Trade Receivables, Gross 291,417,828 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 5,883,693 48,720,590 415,039,522 1,917,828 Total Allowance for Doubtful Accounts (89,762 ) (231,131 ) (213,455 ) (200,097 ) (223,821 ) (176,789 ) (207,518 ) (914,480 ) (133,045 ) (1,980,707 ) (30,289,391 ) (34,660,196 ) — Total Trade Receivables, Net 291,328,066 33,399,262 17,293,165 3,796,047 1,965,584 4,388,548 2,654,063 1,556,493 1,663,913 3,902,986 18,431,199 380,379,326 1,917,828 December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days More than 365 days Total Current Total Non- Current Trade and other current receivables ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Trade receivables, generation 179,498,353 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 214,479,116 5,751,509 - Large customers 179,482,501 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 214,463,264 5,723,942 - Institutional customers — — — — — — — — — — — — — - Others 15,852 — — — — — — — — — — 15,852 27,567 Allowance for doubtful accounts — — — — — — — — — (1,314,310 ) — (1,314,310 ) — Unbilled services 125,367,509 — — — — — — — — — — 125,367,509 3,308,454 Services billed 54,130,844 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 9,600,268 10,508,696 89,111,607 2,443,055 Trade receivables, distribution 100,910,356 31,348,518 13,315,339 3,489,350 1,365,439 882,757 2,927,330 1,572,297 652,998 2,667,650 40,572,966 199,705,000 2,618,369 - Mass-market customers 74,735,718 23,318,881 9,558,288 1,981,025 862,071 615,659 534,796 779,941 347,398 1,202,738 23,490,230 137,426,745 2,164,930 - Large customers 23,586,354 6,566,919 2,148,243 1,231,708 209,825 172,851 1,174,012 46,128 2,424 766,851 10,154,924 46,060,239 34,602 - Institutional customers 2,588,284 1,462,718 1,608,808 276,617 293,543 94,247 1,218,522 746,228 303,176 698,061 6,927,812 16,218,016 418,837 Allowance for doubtful accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (614,954 ) (27,743,446 ) (30,382,506 ) — Unbilled services 61,742,593 — — — — — — — — — — 61,742,593 149,508 Services billed 39,167,763 31,348,518 13,315,339 3,489,350 1,365,439 882,757 2,927,330 1,572,297 652,998 2,667,650 40,572,966 137,962,407 2,465,400 Total Trade Receivables, Gross 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 12,267,918 51,081,662 414,184,116 8,369,878 Total Allowance for Doubtful Accounts (157,009 ) (221,810 ) (212,406 ) (168,457 ) (109,571 ) (110,910 ) (174,725 ) (766,217 ) (103,001 ) (1,929,264 ) (27,743,446 ) (31,696,816 ) — Total Trade Receivables, Net 280,251,700 33,897,290 14,268,110 4,094,395 2,155,961 5,872,964 2,766,214 1,360,066 4,143,730 10,338,654 23,338,216 382,487,300 8,369,878
Trade Receivables by Type of Portfolio	• By type of portfolio: December 31, 2017 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Gross Portfolio Total Non-Current Gross Portfolio Type of Portfolio ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GENERATION Non-renegotiated portfolio 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 4,116,040 195,525,065 — - Large customers 186,724,468 3,057,994 333,079 279,100 10,021 42,015 334,298 399,552 228,498 4,116,040 195,525,065 — - Institutional customers — — — — — — — — — — — — - Others — — — — — — — — — — — — Renegotiated portfolio 45,285 — — — — — — — — — 45,285 62,563 - Large customers — — — — — — — — — — — — - Institutional customers — — — — — — — — — — — — - Others 45,285 — — — — — — — — — 45,285 62,563 DISTRIBUTION Non-renegotiated portfolio 101,580,927 27,144,334 15,240,414 2,949,158 1,807,065 4,174,604 2,192,656 1,727,453 1,371,073 44,191,184 202,378,868 376,463 - Mass-market customers 81,786,896 19,120,060 9,323,291 1,705,992 1,285,659 882,926 671,894 1,554,175 423,730 20,987,147 137,741,770 342,063 - Large customers 17,522,970 6,565,888 4,590,254 940,754 168,838 1,809,919 357,379 30,481 7,237 13,521,914 45,515,634 — - Institutional customers 2,271,061 1,458,386 1,326,869 302,412 352,568 1,481,759 1,163,383 142,797 940,106 9,682,123 19,121,464 34,400 Renegotiated portfolio 3,067,148 3,428,065 1,933,127 767,886 372,319 348,718 334,627 343,968 197,387 6,297,059 17,090,304 1,478,802 - Mass-market customers 2,804,920 3,027,945 1,376,659 558,635 372,319 348,718 246,463 146,430 143,422 6,163,350 15,188,861 1,439,358 - Large Customers 248,972 — 397,617 — — — — — — 106,433 753,022 — - Institutional Customers 13,256 400,120 158,851 209,251 — — 88,164 197,538 53,965 27,276 1,148,421 39,444 Total Gross Portfolio 291,372,543 33,630,393 17,506,620 3,996,144 2,189,405 4,565,337 2,861,581 2,470,973 1,796,958 54,604,283 415,039,522 1,917,828 December 31, 2016 Current Portfolio 1-30 days 31-60 days 61-90 days 91-120 days 121-150 days 151-180 days 181-210 days 211-250 days More than 251 days Total Current Gross Portfolio Total Non-Current Gross Portfolio Type of Portfolio ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ GENERATION Non-renegotiated portfolio 179,498,353 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 20,108,963 214,479,115 5,751,509 - Large customers 179,482,501 2,770,582 1,165,177 773,502 900,093 5,101,117 13,609 553,986 3,593,733 20,108,963 214,463,263 5,723,942 - Institutional customers — — — — — — — — — — — — - Others 15,852 — — — — — — — — — 15,852 27,567 Renegotiated portfolio — — — — — — — — — — — — - Large customers — — — — — — — — — — — — - Institutional customers — — — — — — — — — — — — - Others — — — — — — — — — — — — DISTRIBUTION Non-renegotiated portfolio 96,922,455 27,397,380 11,558,893 3,040,431 1,078,799 651,903 2,402,146 1,462,458 569,329 39,114,907 184,198,701 755,931 - Mass-market customers 71,334,454 20,155,266 8,134,561 1,532,106 575,781 410,789 377,710 670,102 265,574 20,582,480 124,038,823 721,329 - Large customers 23,376,286 6,499,554 2,148,243 1,231,708 209,825 146,867 1,174,012 46,128 2,424 10,921,775 45,756,822 34,602 - Institutional customers 2,211,715 742,560 1,276,089 276,617 293,193 94,247 850,424 746,228 301,331 7,610,652 14,403,056 — Renegotiated portfolio 3,987,901 3,951,138 1,756,446 448,919 286,640 230,854 525,184 109,839 83,669 4,125,709 15,506,299 1,862,438 - Mass-market customers 3,401,264 3,163,614 1,423,727 448,919 286,290 204,870 157,086 109,839 81,824 4,110,488 13,387,921 1,443,601 - Large Customers 210,068 67,366 — — — 25,984 — — — — 303,418 — - Institutional Customers 376,569 720,158 332,719 — 350 — 368,098 — 1,845 15,221 1,814,960 418,837 Total Gross Portfolio 280,408,709 34,119,100 14,480,516 4,262,852 2,265,532 5,983,874 2,940,939 2,126,283 4,246,731 63,349,579 414,184,115 8,369,878
Summary of Estimated Sales and Purchases of Energy and Capacity	This appendix forms an integral part of the Group’s consolidated financial statements. 12-31-2017 12-31-2016 Energy and Tolls Capacity Energy and Tolls Capacity STATEMENT OF FINANCIAL POSITION ThCh$ ThCh$ ThCh$ ThCh$ Current accounts receivable from related companies 5,518,711 466,031 590,636 21,774 Trade and other current receivables 177,886,960 48,122,678 168,833,728 23,276,222 Total Estimated Assets 183,405,671 48,588,709 169,424,364 23,297,996 Current accounts payable to related companies 21,818,299 177,839 13,459,812 191,936 Trade and other current payables 120,451,406 47,893,119 85,425,025 42,571,883 Total Estimated Liabilities 142,269,705 48,070,958 98,884,837 42,763,819 12-31-2017 12-31-2016 12-31-2015 Energy and Tolls Capacity Energy and Tolls Capacity Energy and Tolls Capacity INCOME STATEMENT ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Energy Sales 183,405,671 48,588,709 169,424,364 23,297,996 216,908,877 34,686,488 Energy Purchases 142,269,706 48,070,958 98,884,837 42,763,819 101,922,626 43,935,488

Appendix 7 Details of Due Dat92

Appendix 7 Details of Due Dates of Payments to Suppliers (Tables)	12 Months Ended
	Dec. 31, 2017
Details Of Due Dates Of Payments To Suppliers [Abstract]
Summary of Details of Due Dates of Payments to Suppliers	This appendix forms an integral part of the Group’s consolidated financial statements. December 31, 2017 December 31, 2016 Goods Services Other Total Goods Services Other Total Suppliers with Current Payments ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ ThCh$ Up to 30 days — 94,132,902 91,209,336 185,342,238 — 90,386,018 68,377,696 158,763,714 From 31 to 60 days — — — — — — — — From 61 to 90 days — — — — — — — — From 91 to 120 days — — — — — — — — From 121 to 365 days — — — — — — — — More than 365 days — — — — — — — — Total — 94,132,902 91,209,336 185,342,238 — 90,386,018 68,377,696 158,763,714

Background and Business Activ93

Background and Business Activities - Additional Information (Detail)	Dec. 18, 2015CLP ($)shares	Mar. 23, 2018CLP ($)$ / shares	Mar. 16, 2018$ / shares	Dec. 31, 2017CLP ($)Employeeshares	Dec. 31, 2016CLP ($)Employee	Dec. 31, 2015Companyshares	Dec. 20, 2017CLP ($)shares
Disclosure Of General Information About Financial Statements [Line Items]
Number of employees | Employee				1,948	2,010
Average number of employees | Employee				1,993	2,015
Issued capital				$ 2,229,108,975,000	$ 2,229,108,975,000
Aggregate ownership interest percentage				60.60%
Increase in share capital due to issuance of new shares							$ 1,891,727,278,668
Number of shares issued | shares							23,069,844,862
Tender Offer [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Proportion of ownership interests held by non-controlling interests		40.00%
Capital Increase [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Subscription price | $ / shares			$ 82
Enersis S. A. [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Proportion of ownership interest in subsidiary						60.60%
Reduction of issued capital	$ 5,804,447,986,000			$ 3,575,339,011,549
Number of shares outstanding | shares	49,092,772,762			49,092,772,762
Endesa Chile [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Number of companies resulting from division or demerger | Company						2
Number of former shares exchange for subscription of new share | shares						1
Enersis Chile [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Number of shares outstanding | shares	49,092,772,762
Issued capital	$ 2,229,108,974,451
Enel Generación Chile S.A. [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Proportion of ownership interest in subsidiary				59.98%	59.98%
Enel Generación Chile S.A. [Member] | Tender Offer [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Cash tender offer consideration		$ 590
Payments from cash tender offer consideration for shares		$ 236
Subscription price | $ / shares		$ 82
Enel Generación Chile S.A. [Member] | Tender Offer [Member] | American Depositary Shares [Member]
Disclosure Of General Information About Financial Statements [Line Items]
Cash tender offer consideration		$ 17,700
Payments from cash tender offer consideration for shares		$ 7,080
Subscription price | $ / shares		$ 4,100

Basis of Presentation of the 94

Basis of Presentation of the Consolidated Financial Statements - Summary of Proportion of Net Assets Market Value (Detail)	12 Months Ended
	Dec. 31, 2017
Chile [Member] | Enersis [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	42.00%
Chile [Member] | Endesa, S.A. [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	66.00%
Chile [Member] | Chilectra S A [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	63.00%
Americas [Member] | Enersis [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	58.00%
Americas [Member] | Endesa, S.A. [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	34.00%
Americas [Member] | Chilectra S A [Member]
Proportion Of Net Assets Market Value [Line Items]
Proportion of Net Assets Market Value	37.00%

Basis of Presentation of the 95

Basis of Presentation of the Consolidated Financial Statements - Additional Information (Detail) - CLP ($) $ in Thousands	Jan. 09, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Compliance And Basis of Presentation [Line Items]
Personnel, salary expenses and other employee benefits, description		For purposes of properly distributing the accounting effect of personnel from Enersis on a stand-alone basis between the Company and Enel Américas, the Enersis’ management defined as a criterion to identify those personnel whose main activities were related 100% to the operations based in Chile under Enersis. This group of employees was assigned to the Company. On the other hand, management also identified those employees whose main activities related 100% to foreign operations. This group of employees was assigned to Enel Américas.
Dividends receivable and payable, description		The criterion defined by Enersis’ management to allocate to both the Company as well as to Enel Américas a portion of dividends receivable accounts from Enersis stand-alone as of the date of the Spin-Off, was based mainly on identifying the origin of each one of those dividends. If the dividends come directly from a Chilean subsidiary, these dividends were allocated 100% to the Company.
Estimation of initial application requirements		$ 4,000,000
Decrease in depreciation expense		$ 11,023,983
Proceeds from sale of investments in subsidiary			$ 3,003	$ 25,000,000
Decrease in current assets due to sale of subsidiary	$ 871,022
Decrease in non-current assets due to sale of subsidiary	7,107,941
Decrease in current liability due to sale of subsidiary	3,698,444
Decrease in non-current liability due to sale of subsidiary	1,789,703
Maximum proportion of ownership(in percentage)required to classify entity as associate		20.00%
Top of Range [Member]
Statement of Compliance And Basis of Presentation [Line Items]
Fair value of assets acquired and liabilities assumed, measurement period		1 year
Centrales Hidroelectricas de Aysen S.A. [Member]
Statement of Compliance And Basis of Presentation [Line Items]
Percentage of ownership interest in joint venture		More than a 50%
Enel Americas S.A. [Member]
Statement of Compliance And Basis of Presentation [Line Items]
Percentage of financial debt of Enersis allocated to Enel Americas and not included in combined financial statements		100.00%
Percentage of debt transferred		100.00%
Enel Generación Chile S.A. [Member] | Sociedad Concesionaria Tunel El Melon S. A. [Member]
Statement of Compliance And Basis of Presentation [Line Items]
Proceeds from sale of investments in subsidiary	$ 25,000,000

Basis of Presentation of the 96

Basis of Presentation of the Consolidated Financial Statements - Summary of Breakdown of Allocated Employees (Detail) - Employee	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees	1,948	2,010
Chile [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees	1,923	1,984	1,984
Chile [Member] | Enersis [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			391
Chile [Member] | Endesa, S.A. [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			925
Chile [Member] | Chilectra S A [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			668
Americas [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			96
Americas [Member] | Enersis [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			87
Americas [Member] | Endesa, S.A. [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			7
Americas [Member] | Chilectra S A [Member]
Disclosure Of Breakdown Of Allocated Employees [Line Items]
Number of employees			2

Basis of Presentation of the 97

Basis of Presentation of the Consolidated Financial Statements (New Accounting Pronouncements) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Amendment to IAS 12 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendment to IAS 12: Recognition of Deferred Tax Assets for Unrealized Losses
Accounting pronouncements, effective date	Jan. 1, 2017
Accounting pronouncements, description	The purpose of the amendments to IAS 12 “Income Taxes” is to provide requirements on recognition of deferred tax assets for unrealized losses, and clarify how to account for deferred tax assets related to debt instruments measured at fair value.
Amendment to IAS 7 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendment to IAS 7: Disclosure Initiative
Accounting pronouncements, effective date	Jan. 1, 2017
Accounting pronouncements, description	The amendments to IAS 7 “Statement of Cash Flows” are part of the IASB’s initiative aimed at improving presentation and disclosure of information in the financial statements. The amendments add additional disclosure requirements relating to financing activities in the statement of cash flows. See note 5.e for the disclosures required by this amendment.
Annual Improvements to IFRS (2014 – 2016 Cycle) [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Annual Improvements to IFRS (2014 – 2016 Cycle)
Accounting pronouncements, effective date	Jan. 1, 2017
Accounting pronouncements, description	Annual improvements correspond to a series of limited scope amendments clarifying, correcting or eliminating redundancy in IFRS 12 “Disclosures of Interests in Other Entities”.
IFRS 9 [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	IFRS 9: Financial Instruments
Accounting pronouncements, effective date	Jan. 1, 2018
IFRS 15 [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	IFRS 15: Revenue from Contracts with Customers.
Accounting pronouncements, effective date	Jan. 1, 2018
IFRS 16 [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	IFRS 16: Leases
Accounting pronouncements, effective date	Jan. 1, 2019
IFRIC 22 [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	IFRIC 22: Foreign Currency Transactions and Advance Consideration
Accounting pronouncements, effective date	Jan. 1, 2018
IFRIC 23 [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	IFRIC 23: Uncertainty over Income Tax Treatments
Accounting pronouncements, effective date	Jan. 1, 2019
Annual Improvements to IFRS (2014 – 2016 Cycle) [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Annual Improvements to IFRS (Cycles 2014-2016)
Accounting pronouncements, effective date	Jan. 1, 2018
Accounting pronouncements, description	Annual improvements correspond to a series of minor amendments clarifying, correcting or eliminating redundancy in the following standards: IFRS 1 “First-time Adoption of IFRS and IAS 28 “Investments in Associates and Joint Ventures”.
Amendment to IFRS 2 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendment to IFRS 2: Classification and Measurement of Share-based Payment Transactions
Accounting pronouncements, effective date	Jan. 1, 2018
Accounting pronouncements, description	The amendments provide specific accounting requirements for: (i) the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payments; (ii) share-based payment transactions with a net settlement feature for withholding tax obligations; and (iii) a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled.
Amendments to IAS 40 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendments to IAS 40: Transfers of investment property
Accounting pronouncements, effective date	Jan. 1, 2018
Accounting pronouncements, description	The IASB issued this amendment to clarify that a change in management’s intentions for the use of a property by itself does not constitute evidence of a change in use and not a sufficient reclassification criteria.
Amendments to IFRS 9 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendments to IFRS 9: Prepayment features with negative compensation
Accounting pronouncements, effective date	Jan. 1, 2019
Accounting pronouncements, description	The amendments allow entities to measure prepayable financial assets with negative compensation at amortized cost or at fair value through other comprehensive income upon compliance of certain specific condition, instead of being measured at fair value through profit or loss.
Amendments to IAS 28 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendments to IAS 28: Long-term interests in Associates and Joint Ventures
Accounting pronouncements, effective date	Jan. 1, 2019
Accounting pronouncements, description	The IASB issued these amendments to clarify that an entity that applies IFRS 9 to long-term interests in an associate or joint venture that form part of the net investment in the associate or joint venture but to which the equity method is not applied.
Annual Improvements to IFRS (Cycle 2015-2017) [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Annual Improvements to IFRS (Cycle 2015-2017)
Accounting pronouncements, effective date	Jan. 1, 2019
Accounting pronouncements, description	Annual improvements correspond to a series of limited scope amendments that clarify the wording in an IFRS Standard or correct relatively minor oversights or conflicts between existing requirements of IFRS Standards: IFRS 3 “Business combination”, IFRS 11 “Joint arrangements”, IAS 12 “Income taxes” and IAS 23 “Borrowing costs”.
Amendment to IFRS 10 and IAS 28 [Member] | Amendments and Improvements [Member]
Disclosure of expected impact of initial application of new standards or interpretations [Line Items]
Title of new accounting pronouncements	Amendment to IFRS 10 and IAS 28: Sale or Contribution of Assets
Accounting pronouncements, description	The amendment corrects an inconsistency between IFRS 10 “Consolidated Financial Statements” and IAS 28 “Investments in Associates and Joint Ventures” relating to the accounting treatment of the sale or contributions of assets between an Investor and its Associate or Joint Venture. The IASB decided to postpone the effective date of application of the amendment, until obtaining the results of its research Project on the equity method of accounting.
Accounting pronouncements, effective date	Effective date deferred indefinitely

Accounting Policies Applied - S

Accounting Policies Applied - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Renewable Energy Power Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	20 years
Pipelines [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	20 years
Bottom of Range [Member] | Buildings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Plant and Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	6 years
Bottom of Range [Member] | IT Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	3 years
Bottom of Range [Member] | Fixtures and Fittings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	2 years
Bottom of Range [Member] | Motor Vehicles [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	5 years
Bottom of Range [Member] | Civil Engineering Works at Hydroelectric Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Electromechanical Equipment at Hydroelectric Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Fuel Oil /Coal - Fired Power Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	25 years
Bottom of Range [Member] | Combined Cycle Power Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | High-Voltage Network [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Low- and Medium-Voltage Network [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Measuring and Remote Control Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Bottom of Range [Member] | Primary Substations [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	6 years
Top of Range [Member] | Buildings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	60 years
Top of Range [Member] | Plant and Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	65 years
Top of Range [Member] | IT Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	15 years
Top of Range [Member] | Fixtures and Fittings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	35 years
Top of Range [Member] | Motor Vehicles [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	10 years
Top of Range [Member] | Civil Engineering Works at Hydroelectric Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	65 years
Top of Range [Member] | Electromechanical Equipment at Hydroelectric Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	45 years
Top of Range [Member] | Fuel Oil /Coal - Fired Power Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	40 years
Top of Range [Member] | Combined Cycle Power Plants [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	25 years
Top of Range [Member] | High-Voltage Network [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	60 years
Top of Range [Member] | Low- and Medium-Voltage Network [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	50 years
Top of Range [Member] | Measuring and Remote Control Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	50 years
Top of Range [Member] | Primary Substations [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives	25 years

Accounting Policies Applied - A

Accounting Policies Applied - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Cash flow hedge [Member]
Accounting Policies [Line Items]
Cash flow projection period	ten years
Impairment of non-financial assets [Member]
Accounting Policies [Line Items]
Cash flow projection period	five years
Bottom of Range [Member]
Accounting Policies [Line Items]
Pre-tax discount rates	7.50%
Cash flows of the hedging instrument effective rate	80.00%
Net income for each period absorbed, percentage	30.00%
Top of Range [Member]
Accounting Policies [Line Items]
Pre-tax discount rates	10.70%
Cash flows of the hedging instrument effective rate	125.00%
Computer Software [Member] | Weighted average [Member]
Accounting Policies [Line Items]
Intangible assets, estimated useful life	4 years

Sector Regulation and Electr100

Sector Regulation and Electricity System Operations - Additional Information (Detail)	Nov. 30, 2017$ / MWhGWhTWhCompanyEnergyBlock	Jul. 31, 2016$ / MWhGWhCompanyEnergyBlock	Oct. 31, 2015$ / MWhGWhEnergyBlock	Dec. 31, 2017kWh
Sector Regulations and Electricity System Operations [Line items]
Percentage of renewable energy requirement				5.00%
Percentage of increase in energy requirement				0.50%
Target for renewable energy requirement				10.00%
Target for energy generated by non-conventional renewable energy				20.00%
Percentage of aggregate profitability industry range				10.00%
Number of energy blocks awarded | EnergyBlock	5	5	3
Energy blocks awarded unit | GWh	2,200	12,430	1,200
Number of companies | Company	5	84
Weighted price of energy | $ / MWh	32.5	47.6	79.3
Energy awarded unit per year	1.2	5,918
Reduction in price of prior bid			30.00%
Bottom of Range [Member]
Sector Regulations and Electricity System Operations [Line items]
Profitability margin range				(4.00%)
Top of Range [Member]
Sector Regulations and Electricity System Operations [Line items]
Profitability margin range				4.00%
Residential customers national tariff limit				10.00%
Average energy consumption limit of residential customers | kWh				200

Non-Current Assets or Dispos101

Non-Current Assets or Disposal Groups Classified as Held For Sale - Additional Information (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016CLP ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015CLP ($)	Dec. 31, 2014CLP ($)
Enel Generacion Chile [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Impairment loss recognized		$ 6,577,946		$ 2,522,445
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Percentage of ownership interest disposed	51.00%
Centrales Hidroelectricas de Aysen S.A. [Member] | Enel Generacion Chile [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Impairment loss recognized					$ 69,066,857
Electrogas S.A. [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Percentage of ownership interest disposed		42.50%	42.50%
Amount of sale of subsidiary		$ 115,582,806	$ 180
Proceeds from disposal of non-current assets or disposal groups classified as held for sale per tax gain and discontinued operations		$ 105,311,912

Non-Current Assets or Dispos102

Non-Current Assets or Disposal Groups Classified as Held For Sale - Summary of Carrying Amount of Electrogas S.A. Classified as Non-Current Assets Held For Sale (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Equity of Centrales Hidroeléctricas de Aysén S.A.Ownership Interest	$ 3,786,961,657	$ 3,462,993,642	$ 3,201,900,783	$ 3,084,065,791
Carrying Amount of Centrales Hidroeléctricas de Aysén S.A.	12,707,221	18,738,198	45,716,371
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Equity of Centrales Hidroeléctricas de Aysén S.A.Ownership Interest	$ 8,245,555
Ownership Interest	51.00%
Carrying Amount of Centrales Hidroeléctricas de Aysén S.A.	$ 4,205,233	$ 6,441,166	$ 6,280,293

Non-Current Assets or Dispos103

Non-Current Assets or Disposal Groups Classified as Held For Sale - Summary of Additional Financial Information on Hidroaysen (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Total Current Assets	$ 1,059,341,785	$ 866,526,937
Cash and cash equivalents	419,456,026	245,999,192	$ 144,261,845	$ 133,015,629
Total Non Current Assets	4,635,431,223	4,532,184,075
Property, plant and equipment	3,585,687,137	3,476,128,634
Total Current Liabilities	816,816,646	757,246,647
Profit (loss)	523,417,911	$ 565,271,116	$ 346,968,164
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure of noncurrent assets and disposal groups classified as held for sale [line items]
Total Current Assets	355,835
Cash and cash equivalents	355,446
Total Non Current Assets	8,030,172
Property, plant and equipment	8,030,172
Total Current Liabilities	139,182
Other fixed operating expenses	(8,144,855)
Interest income	24,829
Profit (loss)	$ (8,193,671)

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash And Cash Equivalents [Abstract]
Cash balances	$ 53,875	$ 48,002
Bank balances	35,208,300	48,556,736
Time deposits	11,155,249	17,325,478
Other fixed-income instruments	373,038,602	180,068,976
Total	$ 419,456,026	$ 245,999,192	$ 144,261,845	$ 133,015,629

Cash and Cash Equivalents - 105

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Currency (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of cash and cash equivalents [Line Items]
Cash and cash equivalents	$ 419,456,026	$ 245,999,192	$ 144,261,845	$ 133,015,629
Chilean Peso [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash and cash equivalents	399,164,753	235,993,647
Argentine Peso [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash and cash equivalents	6,263,344	4,807,406
Euros [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash and cash equivalents	11,594
U.S. Dollar [Member]
Disclosure of cash and cash equivalents [Line Items]
Cash and cash equivalents	$ 14,016,335	$ 5,198,139

Cash and Cash Equivalents - 106

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents Received from Sale of Shares of Subsidiaries (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalents [Abstract]
Amounts received for the sale of subsidiaries	$ 3,003	$ 25,000,000
Amounts of cash and cash equivalents in entities sold		(18,360,347)
Total net	$ 3,003	$ 6,639,653

Cash and Cash Equivalents - 107

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents Received from Sale of Shares of Associates (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash And Cash Equivalents [Abstract]
Amounts received for the sale of Associates	$ 115,582,806	$ 132,820,800
Total	$ 115,582,806	$ 132,820,800

Cash and Cash Equivalents - 108

Cash and Cash Equivalents - Summary of Reconciliation of Liabilities Arising from Financing Activities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017CLP ($)
Disclosure of cash and cash equivalents [Line Items]
Beginning balance	$ 843,700,974
Financing Cash Flows, From	150,000,000
Financing Cash Flows, Used	(162,975,507)
Financing Cash Flows, Interest paid	(43,816,959)
Financing Cash Flows, Total	(56,792,466)
Non-Cash Changes, Changes in fair value	(25,059,561)
Non-Cash Changes, Foreign exchange differences	(58,074,683)
Non-Cash Changes, Financial costs	49,437,310
Non-Cash Changes, Other changes	(4,501,595)
Ending balance	748,709,979
Bank Loans [Member]
Disclosure of cash and cash equivalents [Line Items]
Beginning balance	4,274
Financing Cash Flows, Used	(4,156)
Financing Cash Flows, Interest paid	(12,581)
Financing Cash Flows, Total	(16,737)
Non-Cash Changes, Financial costs	12,585
Ending balance	122
Unsecured Obligations [Member]
Disclosure of cash and cash equivalents [Line Items]
Beginning balance	802,306,161
Financing Cash Flows, Used	(5,530,327)
Financing Cash Flows, Interest paid	(43,514,578)
Financing Cash Flows, Total	(49,044,905)
Non-Cash Changes, Foreign exchange differences	(33,226,098)
Non-Cash Changes, Financial costs	43,544,427
Ending balance	763,579,585
Finance Leases [Member]
Disclosure of cash and cash equivalents [Line Items]
Beginning balance	17,749,647
Financing Cash Flows, Used	(2,592,236)
Financing Cash Flows, Total	(2,592,236)
Non-Cash Changes, Foreign exchange differences	(1,359,668)
Non-Cash Changes, Financial costs	811,171
Ending balance	14,608,914
Financial Derivatives for Hedging [Member]
Disclosure of cash and cash equivalents [Line Items]
Beginning balance	23,640,892
Financing Cash Flows, Used	(3,543,399)
Financing Cash Flows, Total	(3,543,399)
Non-Cash Changes, Changes in fair value	(25,059,561)
Non-Cash Changes, Foreign exchange differences	(23,488,917)
Non-Cash Changes, Financial costs	3,473,938
Non-Cash Changes, Other changes	(4,501,595)
Ending balance	(29,478,642)
Loans to Related Parties [Member]
Disclosure of cash and cash equivalents [Line Items]
Financing Cash Flows, From	150,000,000
Financing Cash Flows, Used	(150,000,000)
Financing Cash Flows, Interest paid	(289,800)
Financing Cash Flows, Total	(289,800)
Non-Cash Changes, Financial costs	289,800
Other obligations [Member]
Disclosure of cash and cash equivalents [Line Items]
Financing Cash Flows, Used	(1,305,389)
Financing Cash Flows, Total	(1,305,389)
Non-Cash Changes, Financial costs	$ 1,305,389

Other Financial Assets - Summar

Other Financial Assets - Summary of Other Financial Assets (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information about other financial assets [line items]
Financial assets held to maturity, current	$ 185,913	$ 462,801
Hedging derivatives, current	20,038,433	121,443
Non-Hedging derivatives, current	402,716	0
Other current financial assets	20,627,062	584,244
Financial assets held to maturity, non-current	0	652,733
Hedging derivatives, non-current	30,789,703	25,533,189
Non-Hedging derivatives non-current	0	0
Other non-current financial assets	33,418,204	28,827,542
Unquoted Equity Securities [Member]
Disclosure of information about other financial assets [line items]
Available-for-sale financial investments, current	0	0
Available-for-sale financial investments, non-current	2,595,343	2,616,239
Quoted Equity Securities [Member]
Disclosure of information about other financial assets [line items]
Available-for-sale financial investments, current	0	0
Available-for-sale financial investments, non-current	$ 33,158	$ 25,381

Trade and Other Receivables - S

Trade and Other Receivables - Summary of Trade and Other Receivables, Net (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Trade And Other Receivables [Line Items]
Trade and other receivables, Current	$ 419,752,286	$ 445,071,856
Trade receivables, Current	380,379,326	382,487,300
Other receivables, Current	39,372,960	62,584,556
Trade and other receivables, Non-current	36,182,399	33,500,105
Trade receivables, Non-current	1,917,828	8,369,878
Other receivables, Non-current	34,264,571	25,130,227
Gross Carrying Amount [Member]
Disclosure Of Trade And Other Receivables [Line Items]
Trade and other receivables, Current	463,626,345	484,533,736
Trade receivables, Current	415,039,522	414,184,116
Other receivables, Current	48,586,823	70,349,620
Trade and other receivables, Non-current	36,182,399	33,500,105
Trade receivables, Non-current	1,917,828	8,369,878
Other receivables, Non-current	$ 34,264,571	$ 25,130,227

Trade and Other Receivables 111

Trade and Other Receivables - Summary of Trade and Other Receivables, Net (Parenthetical) (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Trade And Other Receivables [Line Items]
Accounts receivable related to loans and advances to employees	$ 9,709,051	$ 11,167,266
Recoverable taxes	18,318,007	18,658,849
Payments in advance to suppliers	5,360,307	4,804,161
Lease receivables	34,550,131	23,296,966
Other miscellaneous receivables	5,700,035	8,266,102
Unbilled revenue and trade and other accounts receivable	4,117,611	8,581,761
Peru [Member]
Disclosure Of Trade And Other Receivables [Line Items]
Recoverable taxes	$ 0	$ 15,035,980

Trade and Other Receivables - A

Trade and Other Receivables - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017CLP ($)Customer
Disclosure Of Trade And Other Receivables [Abstract]
Trade and other receivables held for use | $	$ 0
Description of how management determines concentrations	customers with sales representing 10% or more of its total consolidated revenues
Number of customers with sales representing 10% or more of revenues | Customer	0

Trade and Other Receivables 113

Trade and Other Receivables - Schedule of Minimum Lease Payments Receivable (Detail) - Lease Receivables [Member] - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Gross	$ 40,029,895	$ 27,840,286
Interest	5,479,764	4,543,320
Present Value	34,550,131	23,296,966
Less Than One Year [Member]
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Gross	4,380,499	2,807,385
Interest	944,578	696,299
Present Value	3,435,921	2,111,086
From One to Five Years [Member]
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Gross	17,521,998	10,011,194
Interest	3,617,167	1,461,944
Present Value	13,904,831	8,549,250
More Than Five Years [Member]
Disclosure Of Finance Lease And Operating Lease By Lessor [Line Items]
Gross	18,127,398	15,021,707
Interest	918,019	2,385,077
Present Value	$ 17,209,379	$ 12,636,630

Trade and Other Receivables 114

Trade and Other Receivables - Summary of Balance of Past Due But Not Impaired Trade Receivables (Detail) - Trade Receivables [Member] - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Assets That Are Past Due But Not Impaired [Line Items]
Trade Receivables Past Due but not Impaired	$ 86,687,926	$ 102,235,600
Less Than Three Months [Member]
Disclosure Of Financial Assets That Are Past Due But Not Impaired [Line Items]
Trade Receivables Past Due but not Impaired	54,488,473	52,259,795
Between Three and Six Months [Member]
Disclosure Of Financial Assets That Are Past Due But Not Impaired [Line Items]
Trade Receivables Past Due but not Impaired	9,008,195	10,795,139
Between Six and Twelve Months [Member]
Disclosure Of Financial Assets That Are Past Due But Not Impaired [Line Items]
Trade Receivables Past Due but not Impaired	7,123,391	15,842,450
More Than Twelve Months [Member]
Disclosure Of Financial Assets That Are Past Due But Not Impaired [Line Items]
Trade Receivables Past Due but not Impaired	$ 16,067,867	$ 23,338,216

Trade and Other Receivables 115

Trade and Other Receivables - Summary of Reconciliation of Changes in the Allowance for Impairment of Trade Receivables (Detail) - Trade Receivables Past Due and Impaired [Member] - Trade Receivables [Member] - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Assets [Line Items]
Balance at beginning of period	$ 39,461,880	$ 35,877,490
Increases (decreases) for the year	7,937,817	5,141,179
Amounts written off	(3,525,638)	(1,556,789)
Balance at end of period	$ 43,874,059	$ 39,461,880

Balances and Transactions wi116

Balances and Transactions with Related Parties - Summary of Receivables from and Accounts Payable to Related Parties (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Transactions Between Related Parties [Line Items]
Description of transaction	Total
Receivables from related parties Current	$ 71,856,046	$ 52,858,384
Accounts payable to related parties Current	119,612,972	90,428,929
Non-current accounts payable to related parties	$ 318,518	$ 251,527
Empresa Electrica Panguipulli S .A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Eléctrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Enel Trade S.p.A [Member] | Commodity Derivatives [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Commodity derivatives
GNL Chile S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-K	76.418.940-K
Relationship	Associate
Currency	U.S. dollar	U.S. dollar
Parque Eolico Talinay Oriente S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Endesa Generacion [Member] | Commodity Derivatives [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Commodity derivatives
Sociedad Almeyda Solar SpA [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Parque Eolico Tal Tal S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Parque Eolico Valle De Los Vientos S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Enel Green Power Del Sur S p A [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur S.p.A
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Geotérmica del Norte [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Electrogas S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5	96.806.130-5
Relationship	Associate
Currency	U.S. dollar	U.S. dollar
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0	77.017.930-0
Relationship	Joint venture
Currency	Chilean peso	Chilean peso
Trade Receivables [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Receivables from related parties Current	$ 71,856,046	$ 52,858,384
Trade Receivables [Member] | Endesa Espana [Member] | Other Services [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa España
Country	Spain
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 70,371	83,448
Trade Receivables [Member] | Endesa Espana [Member] | Other Services [Member] | Spain [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa España
Country	Spain
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 13,077
Trade Receivables [Member] | Empresa Electrica Panguipulli S .A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Electrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 86,089
Trade Receivables [Member] | Empresa Electrica Panguipulli S .A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Electrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 1,031,125	129,755
Trade Receivables [Member] | Empresa Electrica Panguipulli S .A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Electrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 79,217	57,827
Trade Receivables [Member] | Enel Trade S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 8,511
Trade Receivables [Member] | Enel Trade S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 21,484,590
Trade Receivables [Member] | Enel Trade S.p.A [Member] | Commodity Derivatives [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Commodity derivatives
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 20,751,714	22,321,017
Trade Receivables [Member] | Empresa Electrica Puyehue S.A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.880.800-1
Company	Empresa Electrica Puyehue S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 0	64
Trade Receivables [Member] | GNL Chile S.A. [Member] | Advance Natural Gas Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Currency	CH$
Description of transaction	Advance natural gas purchase
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 18,793,098	16,780,275
Trade Receivables [Member] | Parque Eolico Talinay Oriente S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eolico Talinay Oriente SA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 49,677
Trade Receivables [Member] | Parque Eolico Talinay Oriente S.A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eolico Talinay Oriente SA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 16,994	142,926
Trade Receivables [Member] | Parque Eolico Talinay Oriente S.A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eolico Talinay Oriente SA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 134	8
Trade Receivables [Member] | Endesa Generacion [Member] | Other Services [Member] | Spain [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 36,067	36,067
Trade Receivables [Member] | Endesa Generacion [Member] | Commodity Derivatives [Member] | Spain [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Commodity derivatives
Term of transaction	Less than 90 days
Receivables from related parties Current		587,224
Trade Receivables [Member] | Enel Italia Servizi SRL [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia Servizi SRL
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 8,144	8,144
Trade Receivables [Member] | Enel Italia Servizi SRL [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia Servizi SRL
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 290,838	278,834
Trade Receivables [Member] | Sociedad Almeyda Solar SpA [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 19,877
Trade Receivables [Member] | Sociedad Almeyda Solar SpA [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 50,594	98,353
Trade Receivables [Member] | Sociedad Almeyda Solar SpA [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 35,572	21,774
Trade Receivables [Member] | Parque Eolico Tal Tal S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 54,638
Trade Receivables [Member] | Parque Eolico Tal Tal S.A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 41,487	243,946
Trade Receivables [Member] | Parque Eolico Tal Tal S.A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 425
Trade Receivables [Member] | Enel S.p.A [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel SpA
Country	Italy
Relationship	Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 157,701	194,879
Trade Receivables [Member] | Enel S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel SpA
Country	Italy
Relationship	Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 215,289	145,858
Trade Receivables [Member] | Parque Eolico Valle De Los Vientos S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eolico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 49,677
Trade Receivables [Member] | Parque Eolico Valle De Los Vientos S.A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eolico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 75,956	81,377
Trade Receivables [Member] | Enel Green Power Del Sur S p A [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 310,179
Trade Receivables [Member] | Enel Green Power Del Sur S p A [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 28,835	25,559
Trade Receivables [Member] | Enel Green Power Del Sur S p A [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 3,443
Trade Receivables [Member] | Enel Brasil S A [Member] | Other Services [Member] | Brazil [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil S.A.
Country	Brazil
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 47,998	2,121,609
Trade Receivables [Member] | Enel Brasil S A [Member] | Other Services [Member] | Brazil [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil S.A.
Country	Brazil
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 116,436
Trade Receivables [Member] | Enel Brasil S A [Member] | Other Services [Member] | Brazil [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil S.A.
Country	Brazil
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 2,068,594	36,276
Trade Receivables [Member] | Chilectra Inversud [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.532.379-7
Company	Chilectra Inversud
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		150,246
Trade Receivables [Member] | PH Chucas Costa Rica [Member] | Other Services [Member] | Costa Rica [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	PH Chucas Costa Rica
Country	Costa Rica
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 432,233	1,614,168
Trade Receivables [Member] | Enel Green Power Chile S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.210.110-10
Company	Enel Green Power Chile S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 162,594	34,851
Trade Receivables [Member] | Emgesa S.A.E.S.P[Member] | Other Services [Member] | Colombia [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Emgesa S.A. E.S.P.
Country	Colombia
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		29,989
Trade Receivables [Member] | Emgesa S.A.E.S.P[Member] | Other Services [Member] | Colombia [Member] | Colombia, Pesos
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Emgesa S.A. E.S.P.
Country	Colombia
Relationship	Common Immediate Parent
Currency	CP$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 13,746	13,327
Trade Receivables [Member] | Codensa S.A [Member] | Other Services [Member] | Colombia [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Codensa S.A.
Country	Colombia
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 791,622	423,462
Trade Receivables [Member] | Codensa S.A [Member] | Other Services [Member] | Colombia [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Codensa S.A.
Country	Colombia
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 29,221
Trade Receivables [Member] | Enel Americas S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 1,487,709	2,356,523
Trade Receivables [Member] | Enel Americas S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 54,949
Trade Receivables [Member] | Enel Americas S.A. [Member] | Mercantile Current Account [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Mercantile current account
Term of transaction	Less than 90 days
Receivables from related parties Current		519,570
Trade Receivables [Member] | Geotérmica del Norte [Member] | Other Services [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 82,830
Trade Receivables [Member] | Geotérmica del Norte [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy sales
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 10,096
Trade Receivables [Member] | Enel Distribucin Per S.A. [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribución Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 354,283	1,251,369
Trade Receivables [Member] | Enel Green Power Mexico [Member] | Other Services [Member] | Mexico [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Mexico
Country	Mexico
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 152,495
Trade Receivables [Member] | Enel Green Power Perú [Member] | Other Services [Member] | Peru [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Perú
Country	Peru
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 177,478
Trade Receivables [Member] | Enel Generacin Peru S.A. [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 15,192	1,328,268
Trade Receivables [Member] | Enel Generacin Peru S.A. [Member] | Other Services [Member] | Peru [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 758,841
Trade Receivables [Member] | Enel Generacin Peru S.A. [Member] | Other Services [Member] | Peru [Member] | Peru, Nuevos Soles
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	PS$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		15,192
Trade Receivables [Member] | Enel Green Power Brasil [Member] | Other Services [Member] | Brazil [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Brasil
Country	Brazil
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 37,936
Trade Receivables [Member] | Enel Green Power Brasil Participacoes LTDA [Member] | Other Services [Member] | Brazil [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Brasil Participacoes LTDA
Country	Brazil
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 9,188
Trade Receivables [Member] | Enel Green Power Colombia SAS [Member] | Other Services [Member] | Colombia [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Colombia SAS
Country	Colombia
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 46,557
Trade Receivables [Member] | Enel Generacin Piura S.A. [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Piura S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		346,061
Trade Receivables [Member] | Enel Generacin Piura S.A. [Member] | Other Services [Member] | Peru [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Piura S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 165,875
Trade Receivables [Member] | Enel Perú S.A.C [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Perú S.A.C.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		341,948
Trade Receivables [Member] | Compania Energetica Veracruz S.A.C. [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Compañía Energética Veracruz S.A.C.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current		639,233
Trade Receivables [Member] | Chinango S.A.C. [Member] | Other Services [Member] | Peru [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Chinango S.A.C.
Country	Peru
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 17,410
Trade Receivables [Member] | Enel Green Power Italia [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Italia
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 262,694
Trade Receivables [Member] | Empresa Distribuidora del Sur S.A. [Member] | Other Services [Member] | Argentina [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Empresa Distribuidora del Sur S.A.
Country	Argentina
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Receivables from related parties Current	$ 796,750	398,957
Accounts Payables [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Accounts payable to related parties Current	119,612,972	90,428,929
Non-current accounts payable to related parties	$ 318,518	251,527
Accounts Payables [Member] | Endesa Espana [Member] | Other Services [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa España
Country	Spain
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		273,569
Accounts Payables [Member] | Endesa Espana [Member] | Other Services [Member] | Spain [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa España
Country	Spain
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 277,868
Accounts Payables [Member] | Empresa Electrica Panguipulli S .A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Electrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 71,648	92,005
Accounts Payables [Member] | Empresa Electrica Panguipulli S .A. [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Electrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 3,175,956	1,695,658
Accounts Payables [Member] | Enel Trade S.p.A [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		589,896
Accounts Payables [Member] | Enel Trade S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 924,051
Accounts Payables [Member] | Enel Trade S.p.A [Member] | Commodity Derivatives [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Commodity derivatives
Term of transaction	Less than 90 days
Accounts payable to related parties Current		1,103,206
Accounts Payables [Member] | Enel Trade S.p.A [Member] | Commodity Derivatives [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A.
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Commodity derivatives
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 4,184,469
Accounts Payables [Member] | GNL Chile S.A. [Member] | Gas Purchase [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Currency	US$
Description of transaction	Gas Purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 8,100,426	4,872,264
Accounts Payables [Member] | Parque Eolico Talinay Oriente S.A. [Member] | Energy Sales [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente SA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 65,829	48,434
Accounts Payables [Member] | Parque Eolico Talinay Oriente S.A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente SA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 258	301
Accounts Payables [Member] | Endesa Generacion [Member] | Other Services [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 22,257	379,731
Accounts Payables [Member] | Endesa Generacion [Member] | Other Services [Member] | Spain [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 214,667
Accounts Payables [Member] | Endesa Generacion [Member] | Coal Purchase [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Coal Purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current		486,180
Accounts Payables [Member] | Enel Italia Servizi SRL [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia Servizi SRL
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		1,660,149
Accounts Payables [Member] | Enel Italia Servizi SRL [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia Servizi SRL
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 4,591,580
Accounts Payables [Member] | Parque Eolico Tal Tal S.A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 484	333
Accounts Payables [Member] | Parque Eolico Tal Tal S.A. [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eólico Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 2,105,042	2,171,864
Accounts Payables [Member] | Enel S.p.A [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel S.p.A.
Country	Italy
Relationship	Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		120,296
Accounts Payables [Member] | Enel S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel S.p.A.
Country	Italy
Relationship	Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 77,415
Accounts Payables [Member] | Enel S.p.A [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel S.p.A.
Country	Italy
Relationship	Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 1,583,058	564,764
Accounts Payables [Member] | Enel S.p.A [Member] | Dividends [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel S.p.A.
Country	Italy
Relationship	Parent
Currency	CH$
Description of transaction	Dividends
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 63,543,371
Accounts Payables [Member] | Parque Eolico Valle De Los Vientos S.A. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		477
Accounts Payables [Member] | Parque Eolico Valle De Los Vientos S.A. [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 1,261,153
Accounts Payables [Member] | Enel Green Power Del Sur S p A [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		87,448
Accounts Payables [Member] | Enel Green Power Del Sur S p A [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 853	42,901
Accounts Payables [Member] | Enel Green Power Del Sur S p A [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur SpA
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 10,323,531	7,406,880
Accounts Payables [Member] | Emgesa S.A.E.S.P[Member] | Other Services [Member] | Colombia [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Emgesa S.A. E.S.P.
Country	Colombia
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		5,461
Accounts Payables [Member] | Emgesa S.A.E.S.P[Member] | Other Services [Member] | Colombia [Member] | Colombia, Pesos
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Emgesa S.A. E.S.P.
Country	Colombia
Relationship	Common Immediate Parent
Currency	CP$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 4,551
Accounts Payables [Member] | Enel Distribucin Per S.A. [Member] | Other Services [Member] | Peru [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribución Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		2,239
Accounts Payables [Member] | Enel Distribucin Per S.A. [Member] | Other Services [Member] | Peru [Member] | Peru, Nuevos Soles
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribución Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Currency	PS$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 2,110
Accounts Payables [Member] | Enel Green Power Italia [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Italia
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 357,579
Accounts Payables [Member] | Enel Green Power Italia [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Italia
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 99,878
Accounts Payables [Member] | Enel Brasil [Member] | Other Services [Member] | Brazil [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil
Country	Brazil
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		85,864
Accounts Payables [Member] | Enel Brasil [Member] | Other Services [Member] | Brazil [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil
Country	Brazil
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 77,680
Accounts Payables [Member] | Enel Trading Argentina S.R.L. [member] | Other Services [Member] | Argentina [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trading Argentina S.R.L.
Country	Argentina
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		13,574
Accounts Payables [Member] | Enel Trading Argentina S.R.L. [member] | Other Services [Member] | Argentina [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trading Argentina S.R.L.
Country	Argentina
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		63,992
Accounts Payables [Member] | Enel Trading Argentina S.R.L. [member] | Other Services [Member] | Argentina [Member] | Argentine Peso
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trading Argentina S.R.L.
Country	Argentina
Relationship	Common Immediate Parent
Currency	AR$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 74,740
Accounts Payables [Member] | Enel Americas S.A. [Member] | Other Services [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-2
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 912,731
Accounts Payables [Member] | Enel Americas S.A. [Member] | Loan | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-2
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Loan
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 4,650	974,374
Accounts Payables [Member] | Electrogas S.A. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5
Company	Electrogas S.A.
Country	Chile
Relationship	Associate
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current		331,447
Accounts Payables [Member] | Enel Iberoamerica S.R.L [Member] | Other Services [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Iberoamérica S.R.L
Country	Spain
Relationship	Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 35	867,838
Accounts Payables [Member] | Enel Iberoamerica S.R.L [Member] | Other Services [Member] | Spain [Member] | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Iberoamérica S.R.L
Country	Spain
Relationship	Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 749,834	158,909
Accounts Payables [Member] | Enel Iberoamerica S.R.L [Member] | Dividends [Member] | Spain [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Iberoamérica S.R.L
Country	Spain
Relationship	Parent
Currency	CH$
Description of transaction	Dividends
Term of transaction	Less than 90 days
Accounts payable to related parties Current		57,755,885
Accounts Payables [Member] | Enel Distribuzione | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribuzione
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 3,187,971	705,730
Accounts Payables [Member] | Enel Produzione [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Produzione
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		483,665
Accounts Payables [Member] | Enel Produzione [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Produzione
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 10,501,963	118,261
Non-current accounts payable to related parties	$ 318,518
Accounts Payables [Member] | Enel Ingegneria e Ricerca [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Ingegneria e Ricerca
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current		6,343,845
Non-current accounts payable to related parties		251,527
Accounts Payables [Member] | Enel Energia [Member] | Other Services [Member] | ITALY | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Energía
Country	Italy
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 348,370	163,911
Accounts Payables [Member] | Sociedad Almeyda Solar [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 64,484	45,153
Accounts Payables [Member] | Sociedad Almeyda Solar [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 371,339	379,716
Accounts Payables [Member] | Transmisora Electrica de Quillota Ltda. [Member] | Tolls [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0
Company	Transmisora Eléctrica de Quillota Ltda.
Country	Chile
Relationship	Joint Venture
Currency	CH$
Description of transaction	Tolls
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 72,965	$ 332,709
Accounts Payables [Member] | Transmisora Electrica de Quillota Ltda. [Member] | Energy Purchase | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0
Company	Transmisora Eléctrica de Quillota Ltda.
Country	Chile
Relationship	Joint Venture
Currency	CH$
Description of transaction	Energy purchase
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 70,984
Accounts Payables [Member] | Enel Green Power Chile Ltda. [Member] | Other Services [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.920.110-0
Company	Enel Green Power Chile Ltda.
Country	Chile
Relationship	Common Immediate Parent
Currency	CH$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 90,134
Accounts Payables [Member] | Enel Italia [Member] | Other Services [Member] | ITALY | Euros [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia
Country	Italy
Relationship	Common Immediate Parent
Currency	Euros
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 2,089,122
Accounts Payables [Member] | Codensa [Member] | Other Services [Member] | Colombia [Member] | U.S. Dollar [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Codensa
Country	Colombia
Relationship	Common Immediate Parent
Currency	US$
Description of transaction	Other services
Term of transaction	Less than 90 days
Accounts payable to related parties Current	$ 7,936

Balances and Transactions wi117

Balances and Transactions with Related Parties - Summary of Significant Transactions and Effect on Income or Expenses (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Transactions Between Related Parties [Line Items]
Description of transaction	Total
Significant transactions and effects on income/expenses	$ (321,305,504)	$ (251,103,769)	$ (250,465,948)
Endesa Energia S.A. [Member] | Other Operating Income [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Energía S.A.
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses			232,867
Endesa Energia S.A. [Member] | Gas Sales [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Energía S.A.
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Gas Sales
Significant transactions and effects on income/expenses	$ 10,394,146	18,655,911	14,604,841
Endesa Energia S.A. [Member] | Fuel Consumption [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Energía S.A.
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Fuel consumption
Significant transactions and effects on income/expenses		(134,393)	(10,451,242)
Enel Latinoamérica [Member] | Interests Financial Debt [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Latonoamérica
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Interests financial debt
Significant transactions and effects on income/expenses			(18,684)
Endesa Generacion [Member] | Fuel Consumption [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Fuel consumption
Significant transactions and effects on income/expenses		(54,818,466)	(15,030,911)
Endesa Generacion [Member] | Other Fixed Operating Expenses [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses			(23,329)
Endesa Generacion [Member] | Commodity Derivatives [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Generación
Country	Spain
Relationship	Common Immediate Parent
Description of transaction	Commodity derivatives
Significant transactions and effects on income/expenses			(2,144,063)
Generalima S.A.C. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Generalima S.A.C.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Enel Americas S.A. [Member] | Other Operating Income [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses		182,091
Enel Americas S.A. [Member] | Other Fixed Operating Expenses [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses		(1,546,751)
Enel Americas S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 4,737,522	4,822,344
Enel Americas S.A. [Member] | Other Financial Expense [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Financial expenses
Significant transactions and effects on income/expenses	$ (289,800)	(1,933,040)
Enel Americas S.A. [Member] | Financial Income [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Financial income
Significant transactions and effects on income/expenses	$ 144,404	540,259
Enel Americas S.A. [Member] | Other Variable Expenses [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other variable expenses
Significant transactions and effects on income/expenses		(352)
Enel Americas S.A. [Member] | Other Financial Expense [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	94.271.000-3
Company	Enel Américas
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other financial expense
Significant transactions and effects on income/expenses			(4,709,312)
Enel Perú S.A.C [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Perú S.A.C
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 7,405	68,066
Enel Perú S.A.C [Member] | Other Financial Expense [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Perú S.A.C
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Financial expenses
Significant transactions and effects on income/expenses	$ (181)
Codensa S.A [Member] | Other Fixed Operating Expenses [Member] | Colombia [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Codensa S.A.
Country	Colombia
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 399,432	141,664
Codensa S.A [Member] | Other Services Rendered [Member] | Colombia [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Codensa S.A.
Country	Colombia
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses		(709)
Enel Brasil [Member] | Other Services Rendered [Member] | Brazil [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil
Country	Brazil
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		2,044,935
Enel Brasil [Member] | Other Fixed Operating Expenses [Member] | Brazil [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Brasil
Country	Brazil
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses		$ (35,949)
GNL Chile S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-K	76.418.940-K
Relationship	Associate
GNL Chile S.A. [Member] | Other Operating Income [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Description of transaction	Other operating income
Significant transactions and effects on income/expenses		$ (1,539)	81,749
GNL Chile S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 85,274	82,762	54,377
GNL Chile S.A. [Member] | Gas Consumption [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Description of transaction	Gas consumption
Significant transactions and effects on income/expenses	$ (146,507,390)	(102,686,858)	(123,964,573)
GNL Chile S.A. [Member] | Gas Transportation [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.418.940-k
Company	GNL Chile S.A.
Country	Chile
Relationship	Associate
Description of transaction	Gas transportation
Significant transactions and effects on income/expenses	$ (47,656,002)	$ (40,494,275)	(52,195,582)
GNL Quintero S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)		76.788.080-4
GNL Quintero S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.788.080-4
Company	GNL Quintero S.A.
Country	Chile
Relationship	Associate
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		$ 960,390	650,390
GNL Quintero S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.788.080-4
Company	GNL Quintero S.A.
Country	Chile
Relationship	Associate
Description of transaction	Energy sales
Significant transactions and effects on income/expenses		1,912,448	3,260,734
GNL Quintero S.A. [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.788.080-4
Company	GNL Quintero S.A.
Country	Chile
Relationship	Associate
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses		79,203	151,088
Empresa Electrica Panguipulli S .A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Eléctrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 415,162	281,190	392,168
Empresa Electrica Panguipulli S .A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Eléctrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 1,242,092	116,726	286,977
Empresa Electrica Panguipulli S .A. [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Eléctrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ (254,065)	(235,950)	(294,910)
Empresa Electrica Panguipulli S .A. [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.524.140-K
Company	Empresa Eléctrica Panguipulli S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (11,758,824)	(8,803,274)	(10,597,853)
Endesa Cemsa S A | Other Fixed Operating Expenses [Member] | Argentina [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Endesa Cemsa S.A.
Country	Argentina
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses			(11,862)
Empresa Distribuidora del Sur S.A. [Member] | Other Services Rendered [Member] | Argentina [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Empresa Distribuidora del Sur S.A.
Country	Argentina
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 409,823	398,957
Enel Distribucin Per S.A. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribución Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 176,867	$ 70,415
Enel Iberoamerica S.R.L [Member] | Other Fixed Operating Expenses [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Iberoamérica S.R.L
Country	Spain
Relationship	Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses	$ (6,085)		(402,833)
Electrogas S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5	96.806.130-5
Relationship	Associate
Electrogas S.A. [Member] | Fuel Consumption [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5
Company	Electrogas S.A.
Country	Chile
Relationship	Associate
Description of transaction	Fuel consumption
Significant transactions and effects on income/expenses	$ (25,025)	$ (717,599)	(952,044)
Electrogas S.A. [Member] | Gas Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5
Company	Electrogas S.A.
Country	Chile
Relationship	Associate
Description of transaction	Gas tolls
Significant transactions and effects on income/expenses	$ (251,099)	(2,750,858)	(3,296,951)
Emgesa S.A.E.S.P[Member] | Other Operating Income [Member] | Colombia [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Emgesa S.A.E.S.P
Country	Colombia
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses	$ 1,866	$ (2,645)
Enel Argentina S A
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign	Foreign
Enel Argentina S A | Other Fixed Operating Expenses [Member] | Argentina [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Argentina S.A.
Country	Argentina
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses		$ (970)
Enel Generacin Peru S.A. [Member] | Other Operating Income [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses	$ 745,818	(9,253)
Enel Generacin Peru S.A. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		$ (96,109)
Enel Generacin Peru S.A. [Member] | Other Financial Expense [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generación Perú S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Financial expenses
Significant transactions and effects on income/expenses	$ (349)
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0	77.017.930-0
Relationship	Joint venture
Transmisora Electrica de Quillota Ltda. [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0
Company	Transmisora Eléctrica de Quillota Ltda.
Country	Chile
Relationship	Joint venture
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ (1,383,710)	$ (1,291,995)	(1,473,974)
Chilectra Inversud S A | Other Operating Income [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	99.573.910-0
Company	Chilectra Inversud S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses		637
Enel Generacin Piura S.A. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generacion Piura S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 98,421	168,961
Enel Generacin Piura S.A. [Member] | Other Financial Expense [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Generacion Piura S.A.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Financial expenses
Significant transactions and effects on income/expenses	$ (135)
Chilectra Americas S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.532.379-7
Company	Chilectra Américas S.A. (*)
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		289,994	686,249
Chilectra Americas S.A. [Member] | Other Financial Expense [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.532.379-7
Company	Chilectra Américas S.A. (*)
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other financial expense
Significant transactions and effects on income/expenses			(375,037)
Endesa Americas S A | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.536.351-9
Company	Endesa Américas S.A. (*)
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		1,260,448	343,881
PH Chucas Costa Rica [Member] | Other Services Rendered [Member] | Costa Rica [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	PH Chucas Costa Rica
Country	Costa Rica
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 6,629	425,604	1,188,564
PH Chucas Costa Rica [Member] | Other Financial Expense [Member] | Costa Rica [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	PH Chucas Costa Rica
Country	Costa Rica
Relationship	Common Immediate Parent
Description of transaction	Financial expenses
Significant transactions and effects on income/expenses	$ (162,177)
Compania Energetica Veracruz S.A.C. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Compañía Energética Veracruz S.A.C.
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 283,346	42,890
Enel Trade S.p.A [Member] | Commodity Derivatives [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Commodity derivatives
Significant transactions and effects on income/expenses	$ 19,941,617		(833,366)
Enel Trade S.p.A [Member] | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trade S.p.A
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses			(216,437)
Sociedad Almeyda Solar SpA [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 40,643	152,419	109,891
Sociedad Almeyda Solar SpA [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 344,090	64,174	87,062
Sociedad Almeyda Solar SpA [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ (212,402)	(188,859)	(153,929)
Sociedad Almeyda Solar SpA [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.321.458-3
Company	Sociedad Almeyda Solar Spa
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (4,306,145)	(3,674,821)	(3,264,764)
Enel S.p.A [Member] | Other Operating Income [Member] | Spain [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel SpA
Country	Italy
Relationship	Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses	$ (658,611)	(34,700)
Enel Italia Servizi [Member] | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Italia Servizi
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses	$ (2,230,668)	(1,547,695)
Enel Green Power Del Sur S p A [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur S.p.A
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 634,361	15
Enel Green Power Del Sur S p A [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur S.p.A
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 528,740	48,322
Enel Green Power Del Sur S p A [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur S.p.A
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ 3,730	(2,323)
Enel Green Power Del Sur S p A [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.412.562-2
Company	Enel Green Power del Sur S.p.A
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (104,865,684)	(34,952,571)
Parque Eolico Valle De Los Vientos S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 101,595
Parque Eolico Valle De Los Vientos S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 144,589	558,966	670,035
Parque Eolico Valle De Los Vientos S.A. [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.052.206-6
Company	Parque Eólico Valle de los Vientos S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (16,630,422)	(11,992,799)	(14,929,463)
Parque Eolico Tal Tal S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 111,748
Parque Eolico Tal Tal S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 109,643	23,932	217,448
Parque Eolico Tal Tal S.A. [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ 250
Parque Eolico Tal Tal S.A. [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.179.024-2
Company	Parque Eolico Tal Tal S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (25,959,608)	(22,415,584)	(26,456,188)
Enel Green Power Chile Ltda. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.920.110-0
Company	Enel Green Power Chile Ltda.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 162,848	$ 34,855
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.652.400-1	76.652.400-1
Relationship	Joint venture
Centrales Hidroelectricas de Aysen S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.652.400-1
Company	Centrales Hidroeléctricas de Aysén S.A.
Country	Chile
Relationship	Joint venture
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses			260,275
Geotérmica del Norte [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 69,605
Geotérmica del Norte [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 10,552
Geotérmica del Norte [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	96.971.330-6
Company	Geotérmica del Norte
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (456)
Chinango S.A.C. [Member] | Other Services Rendered [Member] | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Chinango S.A.C
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 18,516
Enel Green Power Colombia SAS [Member] | Other Services Rendered [Member] | Colombia [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Colomboa SAS
Country	Colombia
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 46,557
Enel Produzione [Member] | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Produzione
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses	$ 94,045		(206,912)
Enel Distribuzione | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Distribuzione
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses		$ (654,622)
Enel Energy Europe | Other Services Rendered [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Energy Europe
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses			(69,202)
Parque Eolico Talinay Oriente S.A. [Member] | Other Services Rendered [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 101,595
Parque Eolico Talinay Oriente S.A. [Member] | Energy Sales [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy sales
Significant transactions and effects on income/expenses	$ 128,626	89,710	153,158
Parque Eolico Talinay Oriente S.A. [Member] | Electricity Tolls [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Electricity tolls
Significant transactions and effects on income/expenses	$ 144
Parque Eolico Talinay Oriente S.A. [Member] | Energy Purchases [Member] | Chile [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	76.126.507-5
Company	Parque Eólico Talinay Oriente S.A.
Country	Chile
Relationship	Common Immediate Parent
Description of transaction	Energy purchases
Significant transactions and effects on income/expenses	$ (539,646)	(370,964)	(505,404)
Enel Ingegneria E Innovazione | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Ingegneria e Innovazione
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses		(328,310)	(1,354,650)
Enel Ingegneria E Innovazione | Other Services Rendered [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Ingegneria e Innovazione
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses		30,806	$ 35,773
Enel Global Trading S.p.A [Member] | Other Operating Income [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Global Trading S.p.A
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other operating income
Significant transactions and effects on income/expenses		9,191,693
Enel Global Trading S.p.A [Member] | Other Variable Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Global Trading S.p.A
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other variable expenses
Significant transactions and effects on income/expenses		$ (2,120,323)
Enel Trading Argentina S.R.L. [member] | Other Services Rendered [Member] | Argentina [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Trading Argentina S.r.L.
Country	Argentina
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 11,488
Enel Green Power Italia [Member] | Other Fixed Operating Expenses [Member] | ITALY
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Italia
Country	Italy
Relationship	Common Immediate Parent
Description of transaction	Other fixed operating expenses
Significant transactions and effects on income/expenses	$ 262,694
Enel Green Power Perú [Member] | Other Services Rendered One | Peru [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Perù
Country	Peru
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 177,478
Enel Green Power Brasil [Member] | Other Services Rendered One | Brazil [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Brasil
Country	Brazil
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 37,936
Enel Green Power Brasil Participacoes LTDA [Member] | Other Services Rendered One | Brazil [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Brasil Participacoes LTDA
Country	Brazil
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 9,188
Enel Green Power Mexico [Member] | Other Services Rendered One | Mexico [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreign
Company	Enel Green Power Mexico
Country	Mexico
Relationship	Common Immediate Parent
Description of transaction	Other services rendered
Significant transactions and effects on income/expenses	$ 152,495

Balances and Transactions wi118

Balances and Transactions with Related Parties - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017CLP ($)MemberSession	Dec. 31, 2017CLF ( )MemberSession	Dec. 31, 2016CLP ($)
Disclosure Of Transactions Between Related Parties [Line Items]
Number of members in Board of Directors | Member	7	7
Term of service for each director	3 years	3 years
Amounts payable to related parties	$ 119,612,972		$ 90,428,929
Description of compensation transactions	Total	Total
Compensation for directors	$ 3,700,042		2,123,227
Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Amounts receivable from related parties	0
Amounts payable to related parties	$ 0
Description of compensation transactions	The compensation consists of paying a variable annual compensation equal to one one-thousandth of the profit for the year (attributable to shareholders of Enel Chile). Also, each member of the Board will be paid a monthly compensation, one part a fixed monthly fee and another part dependent on meetings attended.	The compensation consists of paying a variable annual compensation equal to one one-thousandth of the profit for the year (attributable to shareholders of Enel Chile). Also, each member of the Board will be paid a monthly compensation, one part a fixed monthly fee and another part dependent on meetings attended.
Compensation for directors	$ 445,161		372,170
Enel Chile Board [Member] | Monthly Fee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Compensation for directors |		180
Enel Chile Board [Member] | Per Diem For Each Meeting
Disclosure Of Transactions Between Related Parties [Line Items]
Compensation for directors |		66
Maximum number of sessions for per diem | Session	15	15
Chairman [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Description of compensation transactions	the compensation for the Chairman of the Board will be the double that of a Director	the compensation for the Chairman of the Board will be the double that of a Director
Directors Committee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Description of compensation transactions	Each member of the Directors’ Committee will receive a variable compensation equal to 0.11765 thousandth of the profit for the year (attributable to shareholders of Enel Chile S.A.). Also each member will be paid a monthly compensation, one part in a fixed monthly fee and another part dependent on meetings attended	Each member of the Directors’ Committee will receive a variable compensation equal to 0.11765 thousandth of the profit for the year (attributable to shareholders of Enel Chile S.A.). Also each member will be paid a monthly compensation, one part in a fixed monthly fee and another part dependent on meetings attended
Compensation for directors	$ 85,512		$ 75,750
Directors Committee [Member] | Monthly Fee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Compensation for directors |		60
Directors Committee [Member] | Per Diem For Each Meeting
Disclosure Of Transactions Between Related Parties [Line Items]
Compensation for directors |		22
Maximum number of sessions for per diem | Session	15	15

Balances and Transactions wi119

Balances and Transactions with Related Parties - Summary of Compensation Paid to Members of the Board of Directors (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 3,700,042	$ 2,123,227
Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	445,161	372,170
Directors Committee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 85,512	$ 75,750
HermanChadwickPineraMember
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	4.975.992-4	4.975.992-4
Name	Hermán Chadwick Piñera	Hermán Chadwick Piñera
Position	Chairman	Chairman
Period in position	January - December 2017	March - December 2016
HermanChadwickPineraMember | Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 178,065	$ 129,578
Giulio Fazio [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	Foreigner	Foreigner
Name	Giulio Fazio	Giulio Fazio
Position	Vice Chairman	Vice Chairman
Period in position	January - December 2017	March - December 2016
Fernan Gazmuri Plaza [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	4.461.192-9	4.461.192-9
Name	Fernán Gazmuri Plaza	Fernán Gazmuri Plaza
Position	Director	Director
Period in position	January - December 2017	March - December 2016
Fernan Gazmuri Plaza [Member] | Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 89,032	$ 80,864
Fernan Gazmuri Plaza [Member] | Directors Committee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 28,504	$ 25,250
Pedro Pablo Cabrera Gaete [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	4.774.797-K	4.774.797-K
Name	Pedro Pablo Cabrera Gaete	Pedro Pablo Cabrera Gaete
Position	Director	Director
Period in position	January - December 2017	March - December 2016
Pedro Pablo Cabrera Gaete [Member] | Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 89,032	$ 80,864
Pedro Pablo Cabrera Gaete [Member] | Directors Committee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 28,504	$ 25,250
Juan Gerardo Jofre Miranda [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	5.672.444-3	5.672.444-3
Name	Juan Gerardo Jofré Miranda	Juan Gerardo Jofré Miranda
Position	Director	Director
Period in position	January - December 2017	March - December 2016
Juan Gerardo Jofre Miranda [Member] | Enel Chile Board [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 89,032	$ 80,864
Juan Gerardo Jofre Miranda [Member] | Directors Committee [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Board of subsidiaries ThCh$	$ 28,504	$ 25,250
Vicenzo Ranieri [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	Foreigner	Foreigner
Name	Vicenzo Ranieri	Vicenzo Ranieri
Position	Director	Director
Period in position	January - December 2017	March - December 2016
Salvatore Bernabei [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID No.	Foreigner	Foreigner
Name	Salvatore Bernabei	Salvatore Bernabei
Position	Director	Director
Period in position	January - December 2017	March - December 2016

Balances and Transactions wi120

Balances and Transactions with Related Parties - Summary of Key Management Personnel (Detail) - Enel Chile Board [Member]	12 Months Ended
	Dec. 31, 2017
Nicola Cotugno [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreigner
Name	Nicola Cotugno
Position	Chief Executive Officer
Raffaele Grandi [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	24.950.967-1
Name	Raffaele Grandi
Position	Administration, Finance and Control Officer
Jose Miranda Montecinos [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	15.307.846-7
Name	Jose Miranda Montecinos
Position	Communications Officer
Alain Rosolino [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	24.166.243-8
Name	Alain Rosolino
Position	Human Resources and Organization Officer
Domingo Valdes Prieto [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	6.973.465-0
Name	Domingo Valdés Prieto
Position	General Counsel and Secretary to the Board
Raffael Cutrignelli [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreigner
Name	Raffael Cutrignelli
Position	Internal Audit Officer
Pedro Urzua Frei [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	11.625.161-2
Name	Pedro Urzúa Frei
Position	Institutional Relations Officer
Bruno Stella [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	Foreigner
Name	Bruno Stella
Position	Planning and control Officer
Francisco Silva Bafalluy [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	7.006.337-9
Name	Francisco Silva Bafalluy
Position	Services Officer
Andres Pinto Bonta [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	13.686.119-0
Name	Andrés Pinto Bonta
Position	Security Officer
Antonella Pellegrini [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	23.819.804-6
Name	Antonella Pellegrini
Position	Sustainability and community relations Officer
Monica de Martino [Member]
Disclosure Of Transactions Between Related Parties [Line Items]
Taxpayer ID Number (RUT)	25.629.782-5
Name	Monica de Martino
Position	Regulation Officer

Balances and Transactions wi121

Balances and Transactions with Related Parties - Summary of Compensation Received by Key Management Personnel (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Transactions Between Related Parties [Abstract]
Cash compensation	$ 2,959,467	$ 1,486,703
Short-term benefits for employees	557,122	341,203
Other long-term benefits	183,453	295,321
Total	$ 3,700,042	$ 2,123,227

Inventories - Summary of Classe

Inventories - Summary of Classes of Inventories (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Classes Of Inventories [Abstract]
Supplies for Production	$ 16,879,260	$ 12,377,179
Gas	2,301,172	2,159,901
Oil	2,593,806	2,556,438
Coal	11,984,282	7,660,840
Other inventories	22,807,682	25,162,417
Total	$ 39,686,942	$ 37,539,596

Inventories - Summary of Cla123

Inventories - Summary of Classes of Inventories (Parenthetical) (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Classes Of Inventories [Abstract]
Other inventories	$ 22,807,682	$ 25,162,417
Supplies for projects and spare parts	12,311,718	17,076,698
Electrical materials	$ 10,495,964	$ 8,085,719

Inventories - Additional Inform

Inventories - Additional Information (Detail) - CLP ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Classes Of Inventories [Abstract]
Inventories pledged as security for liabilities	$ 0	$ 0	$ 0
Raw materials and consumables recognized as fuel expenses	280,739,362,000	$ 295,148,838,000	$ 327,502,996,000
Inventories written down due to obsolescence	$ 0

Current Tax Assets and Liabi125

Current Tax Assets and Liabilities - Summary of Current Tax Assets and Liabilities (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Current Tax Assets And Liabilities [Abstract]
Monthly provisional tax payments	$ 63,942,847	$ 43,862,763
Tax credit for absorbed profits	13,433,962	11,398,609
Tax credit for training expenses	261,000	241,700
Other	118,239	146,099
Total	77,756,048	55,649,171
Income tax	67,027,507	61,599,415
Total	$ 67,027,507	$ 61,599,415

Investments Accounted for Us126

Investments Accounted for Using the Equity Method - Summary of Changes in Investments in Associates and Joint Ventures Accounted For Using the Equity Method (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Investments accounted for using Equity Method, Beginning balance	$ 18,738,198	$ 45,716,371
Additions	1,943,100	2,584,416
Share of Profit (Loss)	(2,696,904)	7,878,199
Dividends Declared	(743,734)	(6,577,130)
Foreign Currency Translation	(327,039)	(1,852,710)
Other Comprehensive Income	(1,490)	(11,691,509)
Other Increase (Decrease)	(4,204,910)	(17,319,439)
Investments accounted for using Equity Method, Ending balance	$ 12,707,221	$ 18,738,198
GNL Chile S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)	76.418.940-K	76.418.940-K
Associates and Joint Ventures	GNL Chile S.A.	GNL Chile S.A.
Country	Chile	Chile
Currency	U.S. dollar	U.S. dollar
Ownership Interest	33.33%	33.33%
Investments accounted for using Equity Method, Beginning balance	$ 3,982,934	$ 2,662,029
Share of Profit (Loss)	841,957	1,491,025
Dividends Declared	(743,734)
Foreign Currency Translation	(297,841)	(170,120)
Investments accounted for using Equity Method, Ending balance	$ 3,783,316	$ 3,982,934
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)	76.652.400-1	76.652.400-1
Associates and Joint Ventures	Centrales Hidroeléctricas De Aysén S.A.	Centrales Hidroeléctricas De Aysén S.A.
Country	Chile	Chile
Currency	Chilean peso	Chilean peso
Ownership Interest	51.00%	51.00%
Investments accounted for using Equity Method, Beginning balance	$ 6,441,166	$ 6,280,293
Additions	1,943,100	2,346,000
Share of Profit (Loss)	(4,179,033)	(2,185,127)
Other Increase (Decrease)	(4,205,233)
Investments accounted for using Equity Method, Ending balance	$ 4,205,233	$ 6,441,166
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)	77.017.930-0	77.017.930-0
Associates and Joint Ventures	Transmisora Eléctrica de Quillota Ltda.	Transmisora Eléctrica de Quillota Ltda.
Country	Chile	Chile
Currency	Chilean peso	Chilean peso
Ownership Interest	50.00%	50.00%
Investments accounted for using Equity Method, Beginning balance	$ 8,222,763	$ 7,594,153
Share of Profit (Loss)	595,996	628,610
Investments accounted for using Equity Method, Ending balance	$ 8,818,759	$ 8,222,763
Electrogas S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)	96.806.130-5	96.806.130-5
Associates and Joint Ventures	Electrogas S.A.	Electrogas S.A.
Country		Chile
Currency	U.S. dollar	U.S. dollar
Ownership Interest		42.50%
Investments accounted for using Equity Method, Beginning balance		$ 12,042,873
Share of Profit (Loss)		5,166,226
Dividends Declared		(3,979,095)
Foreign Currency Translation		(844,372)
Other Comprehensive Income		607,375
Other Increase (Decrease)		$ (12,993,007)
GNL Quintero S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)		76.788.080-4
Associates and Joint Ventures		GNL Quintero S.A.
Country		Chile
Currency		U.S. dollar
Ownership Interest		20.00%
Investments accounted for using Equity Method, Beginning balance		$ 17,137,023
Share of Profit (Loss)		2,750,075
Dividends Declared		(2,598,035)
Foreign Currency Translation		(816,094)
Other Comprehensive Income		(12,298,165)
Other Increase (Decrease)		$ (4,174,804)
Enel Argentina S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)	Foreign	Foreign
Associates and Joint Ventures	Enel Argentina S.A.	Enel Argentina S.A.
Country	Argentina	Argentina
Currency	Argentine peso	Argentine peso
Ownership Interest	0.12%	0.12%
Investments accounted for using Equity Method, Beginning balance	$ 91,335
Additions		$ 235,090
Share of Profit (Loss)	44,176	23,610
Foreign Currency Translation	(29,198)	(21,044)
Other Comprehensive Income	(1,490)	(656)
Other Increase (Decrease)	323	(145,665)
Investments accounted for using Equity Method, Ending balance	$ 105,146	$ 91,335
Southern Cone S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Taxpayer ID Number (RUT)		Foreign
Associates and Joint Ventures		Southern Cone S.A.
Country		Argentina
Currency		Argentine peso
Ownership Interest		2.00%
Additions		$ 3,326
Share of Profit (Loss)		3,780
Foreign Currency Translation		(1,080)
Other Comprehensive Income		(63)
Other Increase (Decrease)		$ (5,963)

Investments Accounted for Us127

Investments Accounted for Using the Equity Method - Additional Information (Detail)	Jun. 09, 2016	Dec. 31, 2017CLP ($)	Sep. 14, 2016CLP ($)	Sep. 14, 2016USD ($)
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership interest acquired	20.00%
Consideration transferred			$ 132,820,800,000	$ 197,365,113.2
Joint Ventures [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Consideration transferred		$ 0
Associates [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Consideration transferred		0
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Impairment loss		$ 69,066,857,000

Investments Accounted for Us128

Investments Accounted for Using the Equity Method - Summary of Financial Information from Financial Statements of Investments in Associates (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Current Assets	$ 1,059,341,785	$ 866,526,937
Non-current Assets	4,635,431,223	4,532,184,075
Current Liabilities	816,816,646	757,246,647
Non-current Liabilities	1,090,994,705	1,178,470,723
Revenues	2,490,470,178	2,515,843,880	$ 2,384,293,189
NET INCOME	523,417,911	565,271,116	346,968,164
Other Comprehensive Income	69,423,985	47,891,771	(95,460,269)
Comprehensive Income	$ 592,841,896	$ 613,162,887	$ 251,507,895
GNL Chile S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership Interest	33.33%	33.33%
Current Assets	$ 71,254,956	$ 90,283,944
Non-current Assets	148,950	117,703
Current Liabilities	60,052,823	78,452,153
Revenues	687,399,254	615,229,994
Expenses	(684,873,130)	(610,756,322)
NET INCOME	2,526,124	4,473,672
Other Comprehensive Income	(24,472)	(510,406)
Comprehensive Income	$ 2,501,652	$ 3,963,266
GNL Quintero S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership Interest		20.00%
Revenues		$ 86,471,706
Expenses		(72,752,059)
NET INCOME		13,719,647
Other Comprehensive Income		(65,571,292)
Comprehensive Income		$ (51,851,645)
Electrogas S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership Interest		42.50%
Current Assets		$ 9,318,456
Non-current Assets		40,746,438
Current Liabilities		5,683,680
Non-current Liabilities		13,809,430
Revenues		24,126,070
Expenses		(11,970,244)
NET INCOME		12,155,826
Other Comprehensive Income		(347,369)
Comprehensive Income		$ 11,808,457

Investments Accounted for Us129

Investments Accounted for Using the Equity Method - Summary of Financial Information from Financial Statements of Main Joint Ventures (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Current Assets	$ 1,059,341,785	$ 866,526,937
Non-current Assets	4,635,431,223	4,532,184,075
Current Liabilities	816,816,646	757,246,647
Non-current Liabilities	1,090,994,705	1,178,470,723
Cash and cash equivalents	419,456,026	245,999,192	$ 144,261,845	$ 133,015,629
Revenues	2,490,470,178	2,515,843,880	2,384,293,189
Depreciation and amortization expense	(152,684,106)	(161,660,610)	(153,201,662)
Income tax expense, continuing operations	(143,342,301)	(111,403,182)	(109,612,599)
Profit (loss)	523,417,911	565,271,116	346,968,164
Other Comprehensive Income	69,423,985	47,891,771	(95,460,269)
Comprehensive Income	$ 592,841,896	$ 613,162,887	$ 251,507,895
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership interest	51.00%	51.00%
Current Assets	$ 355,835	$ 863,962
Non-current Assets	8,030,172	15,159,321
Current Liabilities	139,182	3,324,706
Non-current Liabilities		68,081
Cash and cash equivalents	355,446	860,719
Other fixed operating expenses	(8,144,855)	(4,363,197)
Interest income	24,829	42,046
Income tax expense, continuing operations		(7,070)
Profit (loss)	(8,193,671)	(4,284,131)
Other Comprehensive Income	0	0
Comprehensive Income	$ (8,193,671)	$ (4,284,131)
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Ownership interest	50.00%	50.00%
Current Assets	$ 7,793,702	$ 6,366,378
Non-current Assets	12,036,201	12,034,576
Current Liabilities	440,426	245,025
Non-current Liabilities	1,751,963	1,710,406
Cash and cash equivalents	7,310,296	5,716,196
Revenues	2,813,493	2,774,316
Other fixed operating expenses	(525,471)
Depreciation and amortization expense	(782,322)	(773,093)
Interest income		134,995
Income tax expense, continuing operations	(313,709)	(225,008)
Profit (loss)	1,191,991	1,257,220
Other Comprehensive Income	0	0
Comprehensive Income	$ 1,191,991	$ 1,257,220

Intangible Assets Other Than130

Intangible Assets Other Than Goodwill - Summary of Intangible Assets (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	$ 55,170,904	$ 44,470,750	$ 42,879,326
Intangible Assets, Amortization and Impairment	(6,811,041)	(5,833,991)
Gross Carrying Amount [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	118,593,240	101,092,918
Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible Assets, Amortization and Impairment	(63,422,336)	(56,622,168)
Easements and Water Rights [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	12,608,950	12,564,076	14,575,473
Easements and Water Rights [Member] | Gross Carrying Amount [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	14,598,701	14,553,826
Easements and Water Rights [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible Assets, Amortization and Impairment	(1,989,751)	(1,989,750)
Computer Software [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	38,254,793	27,591,694	27,824,092
Intangible Assets, Amortization and Impairment	(6,803,337)	(5,815,030)
Computer Software [Member] | Gross Carrying Amount [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	93,260,355	75,793,919
Computer Software [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible Assets, Amortization and Impairment	(55,005,562)	(48,202,225)
Other Identifiable Intangible Assets [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	4,307,161	4,314,980	$ 479,761
Intangible Assets, Amortization and Impairment	(7,704)	(18,961)
Other Identifiable Intangible Assets [Member] | Gross Carrying Amount [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible assets	10,734,184	10,745,173
Other Identifiable Intangible Assets [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Intangible Assets, Amortization and Impairment	$ (6,427,023)	$ (6,430,193)

Intangible Assets Other Than131

Intangible Assets Other Than Goodwill - Summary of Reconciliations of the Carrying Amounts of Intangible Assets (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	$ 44,470,750	$ 42,879,326
Changes in identifiable intangible assets
Increases (decreases) other than from business combinations	17,762,024	10,081,778
Increase (decrease) from exchange differences, net	(115)	2,897
Intangible Assets, Amortization and Impairment	(6,811,041)	(5,833,991)
Increases (decreases) from transfers and other changes	(250,714)
Increases (decreases) from transfers	(250,714)
Disposals and removals from service		(2,549,926)
Disposals		(2,549,926)
Other increases (decreases)		(109,334)
Total changes in identifiable intangible assets	10,700,154	1,591,424
Ending balance	55,170,904	44,470,750
Easements and Water Rights [Member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	12,564,076	14,575,473
Changes in identifiable intangible assets
Increases (decreases) other than from business combinations	295,588	540,052
Increases (decreases) from transfers and other changes	(250,714)	352
Increases (decreases) from transfers	(250,714)	352
Disposals and removals from service		(2,549,926)
Disposals		(2,549,926)
Other increases (decreases)		(1,875)
Total changes in identifiable intangible assets	44,874	(2,011,397)
Ending balance	12,608,950	12,564,076
Computer Software [Member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	27,591,694	27,824,092
Changes in identifiable intangible assets
Increases (decreases) other than from business combinations	17,466,436	5,690,091
Intangible Assets, Amortization and Impairment	(6,803,337)	(5,815,030)
Other increases (decreases)		(107,459)
Total changes in identifiable intangible assets	10,663,099	(232,398)
Ending balance	38,254,793	27,591,694
Other Identifiable Intangible Assets [Member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	4,314,980	479,761
Changes in identifiable intangible assets
Increases (decreases) other than from business combinations		3,851,635
Increase (decrease) from exchange differences, net	(115)	2,897
Intangible Assets, Amortization and Impairment	(7,704)	(18,961)
Increases (decreases) from transfers and other changes		(352)
Increases (decreases) from transfers		(352)
Total changes in identifiable intangible assets	(7,819)	3,835,219
Ending balance	$ 4,307,161	$ 4,314,980

Intangible Assets Other Than132

Intangible Assets Other Than Goodwill - Additional Information (Detail) - CLP ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Intangible Assets [Abstract]
Intangible assets with an indefinite useful life	$ 0	$ 0

Goodwill - Summary of Goodwill

Goodwill - Summary of Goodwill by the Cash-Generating Unit or Group of Cash-Generating Units (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information for cash-generating units [Line Items]
Opening balance	$ 887,257,655	$ 887,257,655
Increase/ (Decrease)	0	0
Closing balance	887,257,655	887,257,655
Empresa Electrica de Colina Ltda. [Member] | Empresa Electrica de Colina Ltda. [Member]
Disclosure of information for cash-generating units [Line Items]
Opening balance	2,240,478	2,240,478
Increase/ (Decrease)	0	0
Closing balance	2,240,478	2,240,478
Compania Electrica Tarapaca S.A. [Member] | Enel Generacion Chile [Member]
Disclosure of information for cash-generating units [Line Items]
Opening balance	0	4,656,105
Increase/ (Decrease)	0	(4,656,105)
Closing balance	0	0
Enel Distribucion Chile S.A. [Member] | Enel Distribucion Chile [Member]
Disclosure of information for cash-generating units [Line Items]
Opening balance	128,374,362	128,374,362
Increase/ (Decrease)	0	0
Closing balance	128,374,362	128,374,362
Enel Generación Chile S.A. [Member] | Enel Generacion Chile [Member]
Disclosure of information for cash-generating units [Line Items]
Opening balance	731,782,459	731,782,459
Increase/ (Decrease)	0	0
Closing balance	731,782,459	731,782,459
GasAtacama Chile [Member] | Enel Generacion Chile [Member]
Disclosure of information for cash-generating units [Line Items]
Opening balance	24,860,356	20,204,251
Increase/ (Decrease)	0	4,656,105
Closing balance	$ 24,860,356	$ 24,860,356

Goodwill - Additional Informati

Goodwill - Additional Information (Detail)	Apr. 22, 2014	Aug. 11, 2005	Jul. 12, 2002	Nov. 30, 2000	May 11, 1999	Sep. 30, 1996
Empresa Electrica de Colina Ltda. [Member]
Disclosure of information about Goodwill [Line Items]
Acquisition percentage from investment company						100.00%
Enel Distribucion Chile S.A. [Member]
Disclosure of information about Goodwill [Line Items]
Additional ownership percentage				25.40%
Ownership interest in subsidiary				99.99%
Enel Generación Chile S.A. [Member]
Disclosure of information about Goodwill [Line Items]
Additional ownership percentage					35.00%
Ownership interest in subsidiary					60.00%
GasAtacama Chile S.A. [Member]
Disclosure of information about Goodwill [Line Items]
Ownership interest in subsidiary	50.00%
Empresa Electrica Pangue S.A. [Member]
Disclosure of information about Goodwill [Line Items]
Percentage of acquisition through put option			2.51%
Compania Electrica San Isidro S.A. [Member]
Disclosure of information about Goodwill [Line Items]
Ownership interest in subsidiary		25.00%

Property Plant and Equipment -

Property Plant and Equipment - Summary of Property Plant and Equipment (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,585,687,137	$ 3,476,128,634
Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,726,796,186	6,471,364,618
Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	(3,141,109,049)	(2,995,235,984)
Construction in Progress [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	666,590,543	688,387,124	$ 636,148,748
Construction in Progress [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	666,590,543	688,387,124
Land [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	67,485,380	66,868,119	66,900,933
Land [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	67,485,380	66,868,119
Buildings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	12,793,641	13,020,474	13,481,093
Buildings [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	28,382,234	27,891,216
Buildings [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	(15,588,593)	(14,870,742)
Generation Plant and Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,080,903,064	2,033,720,809	2,072,402,503
Generation Plant and Equipment [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,636,175,749	4,481,701,141
Generation Plant and Equipment [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	(2,555,272,685)	(2,447,980,332)
Network Infrastructure [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	683,120,815	613,443,219	589,334,703
Network Infrastructure [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,151,951,280	1,050,212,442
Network Infrastructure [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	(468,830,465)	(436,769,223)
Fixtures and Fittings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	56,284,762	41,325,699	20,716,643
Fixtures and Fittings [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	147,450,968	127,544,544
Fixtures and Fittings [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	(91,166,206)	(86,218,845)
Other Property, Plant and Equipment Under Financial Lease [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	18,508,932	19,363,190	$ 20,075,072
Other Property, Plant and Equipment Under Financial Lease [Member] | Gross Carrying Amount [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	28,760,032	28,760,032
Other Property, Plant and Equipment Under Financial Lease [Member] | Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ (10,251,100)	$ (9,396,842)

Property Plant and Equipment136

Property Plant and Equipment - Summary of Changes in Property Plant and Equipment (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	$ 3,476,128,634
Changes:
Increases other than from business combinations	283,819,250	$ 267,113,692
Impairment losses recognized in profit or loss		(30,785,531)	$ 10,165,211
Ending balance	3,585,687,137	3,476,128,634
Construction in Progress [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	688,387,124	636,148,748
Changes:
Increases other than from business combinations	281,007,995	244,473,325
Increases (decreases) from exchange differences, net	(101,444)	(37,543)
Impairment losses recognized in profit or loss		(30,785,531)
Increases (decreases) from transfers and other changes	(273,509,759)	(128,045,183)
Increases (decreases) for transfers	(273,509,759)	(127,694,878)
Increases (decreases) from transfers from constructions in progress		(127,694,878)
Increases (decreases) from other changes		(350,305)
Disposals and removals from service	(30,255,180)	(33,366,692)
Disposals	(5,099,800)
Removals from service	(25,155,380)	(33,366,692)
Other increases (decreases)	1,061,807
Total changes	(21,796,581)	52,238,376
Ending balance	666,590,543	688,387,124	636,148,748
Land [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	66,868,119	66,900,933
Changes:
Increases (decreases) from exchange differences, net	(25,624)	(6,591)
Increases (decreases) from transfers and other changes	776,933	104,268
Increases (decreases) for transfers	776,933	104,268
Increases (decreases) from transfers from constructions in progress		104,268
Disposals and removals from service	(31,447)	(130,491)
Disposals	(31,447)
Removals from service		(130,491)
Other increases (decreases)	(102,601)
Total changes	617,261	(32,814)
Ending balance	67,485,380	66,868,119	66,900,933
Buildings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	13,020,474	13,481,093
Changes:
Increases other than from business combinations		24,934
Increases (decreases) from exchange differences, net	(44,699)	(11,711)
Depreciation	(717,851)	(620,865)
Increases (decreases) from transfers and other changes	439,284	147,023
Increases (decreases) for transfers	439,284	147,023
Increases (decreases) from transfers from constructions in progress		147,023
Disposals and removals from service	(154,623)
Removals from service	(154,623)
Other increases (decreases)	251,056
Total changes	(226,833)	(460,619)
Ending balance	12,793,641	13,020,474	13,481,093
Generation Plant and Equipment [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	2,033,720,809	2,072,402,503
Changes:
Increases (decreases) from exchange differences, net	(336,622)	(59,516)
Depreciation	(107,292,353)	(99,397,373)
Increases (decreases) from transfers and other changes	155,711,630	60,822,509
Increases (decreases) for transfers	155,711,630	55,464,141
Increases (decreases) from transfers from constructions in progress		55,464,141
Increases (decreases) from other changes		5,358,368
Disposals and removals from service	(1,704,924)	(47,314)
Disposals	(435,327)
Removals from service	(1,269,597)	(47,314)
Other increases (decreases)	804,524	1,753,884
Total changes	47,182,255	(38,681,694)
Ending balance	2,080,903,064	2,033,720,809	2,072,402,503
Network Infrastructure [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	613,443,219	589,334,703
Changes:
Increases other than from business combinations		1,443,508
Depreciation	(32,061,242)	(25,187,344)
Increases (decreases) from transfers and other changes	99,419,024	48,308,750
Increases (decreases) for transfers	99,419,024	48,308,750
Increases (decreases) from transfers from constructions in progress		48,308,750
Disposals and removals from service	(1,023,777)	(456,398)
Disposals	(18,555)
Removals from service	(1,005,222)	(456,398)
Other increases (decreases)	3,343,591
Total changes	69,677,596	24,108,516
Ending balance	683,120,815	613,443,219	589,334,703
Fixtures and Fittings [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	41,325,699	20,716,643
Changes:
Increases other than from business combinations	2,811,255	3,126,834
Increases (decreases) from exchange differences, net	(83,651)	(33,227)
Depreciation	(4,947,361)	(4,497,175)
Increases (decreases) from transfers and other changes	17,162,888	22,123,585
Increases (decreases) for transfers	17,162,888	23,670,696
Increases (decreases) from transfers from constructions in progress		23,670,696
Increases (decreases) from other changes		(1,547,111)
Disposals and removals from service	15,932	(110,961)
Disposals	38,212
Removals from service	(22,280)	(110,961)
Total changes	14,959,063	20,609,056
Ending balance	56,284,762	41,325,699	20,716,643
Other Property, Plant and Equipment Under Financial Lease [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	19,363,190	20,075,072
Changes:
Depreciation	(854,258)	(711,882)
Total changes	(854,258)	(711,882)
Ending balance	18,508,932	19,363,190	20,075,072
Property Plant And Equipment Net
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Beginning balance	3,476,128,634	3,419,059,695
Changes:
Increases other than from business combinations	283,819,250	249,068,601
Increases (decreases) from exchange differences, net	(592,040)	(148,588)
Depreciation	(145,873,065)	(130,414,639)
Impairment losses recognized in profit or loss		(30,785,531)
Increases (decreases) from transfers and other changes		3,460,952
Increases (decreases) from other changes		3,460,952
Disposals and removals from service	(33,154,019)	(34,111,856)
Disposals	(5,546,917)
Removals from service	(27,607,102)	(34,111,856)
Other increases (decreases)	5,358,377	3,416,059,695
Total changes	109,558,503	57,068,939
Ending balance	$ 3,585,687,137	$ 3,476,128,634	$ 3,419,059,695

Property Plant and Equipment137

Property Plant and Equipment - Additional Information (Detail) € in Millions	Nov. 01, 2016CLP ($)	Aug. 31, 2016CLP ($)	Dec. 31, 2017CLP ($)Project	Dec. 31, 2016CLP ($)	Dec. 31, 2015CLP ($)	Dec. 31, 2014CLP ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2009CLP ($)
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Additions to property plant and equipment, investments in operating plants and new projects			$ 283,819,250,000	$ 267,113,692,000
Investment on property plant and equipment, maintenance to plants			203,460,335,000	189,259,095,000
Investment on property plant and equipment, network extensions and investments to optimize the operation			79,028,802,000	76,355,399,000
Capitalized borrowing costs			4,078,463,000	3,001,211,000	$ 2,221,329,000
Weighted average borrowing rate					9.00%
Employee expenses capitalized, included in Other work performed by the entity and capitalized in Comprehensive Income Statement			14,388,987,000	16,096,852,000	$ 21,004,053,000
Property plant and equipment held under finance leases			$ 18,508,931,000	19,363,190,000
Lease agreement period			20 years
Annual interest rate			6.50%				6.50%
Operating lease contracts for material assets			$ 2,969,436,000	3,250,503,000	10,098,166,000
Contractual commitments for the acquisition of property, plants and equipment			376,627,392,000	416,684,117,000
Property, plant and equipment pledged as security for liabilities			0	0
Civil Liability Insurance Amount			$ 368,645,000,000				€ 500
Group recognized impairement loss						$ 12,581,947,000
Impairment Test Period			5 years
Impairment loss recognized			$ 7,937,817,000	5,141,179,000	7,110,308,000
Impairment loss recognized		$ 32,834,160,000
Impairment loss recognized		$ 2,549,926,000
Percentage of impairment related cost			100.00%				100.00%
Neltume Project [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Impairment loss recognized			$ 21,975,641,000	20,459,461,000
Choshuenco Projects [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Impairment loss recognized			3,130,270,000	3,748,124,000
GasAtacama Chile S.A. [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Impairment loss recognized	$ 12,578,098,000
Enel Generacion Chile [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Impairment loss recognized				$ 6,577,946,000	2,522,445,000
Impairment loss recognized					$ 2,706,830,000
Impairment loss recognized			$ 1,096,137,000
Percentage of impairment related cost			100.00%	100.00%			100.00%
Number of thermal project | Project			2
Provision recognized			$ 2,244,900,000
Enel Generación Chile S.A. [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Allowance For Impairment Losses								$ 43,999,600,000
Generating Companies [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Insurance Policies Amount For All Risks			737,290,000,000				€ 1,000
Distribution Companies [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Civil Liability Insurance Amount			$ 36,864,500,000				€ 50
Bottom of Range [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Weighted average borrowing rate			7.12%	7.95%
Top of Range [Member]
Disclosure of Detailed Information About Property, Plant and Equipment [Line Items]
Weighted average borrowing rate			7.95%	9.00%

Property Plant and Equipment138

Property Plant and Equipment - Schedule of Future Lease Payments Finance Leases (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of finance lease and operating lease by lessor [Line Items]
Gross	$ 16,672,544	$ 20,834,479
Interest	2,063,630	3,084,832
Present Value	14,608,914	17,749,647
Less Than One Year [Member]
Disclosure of finance lease and operating lease by lessor [Line Items]
Gross	2,459,000	2,677,881
Interest	659,212	837,514
Present Value	1,799,788	1,840,367
From One to Five Years [Member]
Disclosure of finance lease and operating lease by lessor [Line Items]
Gross	9,836,000	10,711,519
Interest	1,244,808	1,763,190
Present Value	8,591,192	8,948,329
More Than Five Years [Member]
Disclosure of finance lease and operating lease by lessor [Line Items]
Gross	4,377,544	7,445,079
Interest	159,610	484,128
Present Value	$ 4,217,934	$ 6,960,951

Property Plant and Equipment139

Property Plant and Equipment - Schedule of Total Future Lease Payments (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Future Minimum Lease Payments [Line Items]
Future lease payments	$ 14,974,415	$ 28,146,689
Less Than One Year [Member]
Disclosure Of Future Minimum Lease Payments [Line Items]
Future lease payments	4,622,605	7,133,186
From One to Five Years [Member]
Disclosure Of Future Minimum Lease Payments [Line Items]
Future lease payments	9,006,627	11,998,147
More Than Five Years [Member]
Disclosure Of Future Minimum Lease Payments [Line Items]
Future lease payments	$ 1,345,183	$ 9,015,356

Investment Property - Summary o

Investment Property - Summary of Changes in Investment Property (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about investment property [Line Items]
Beginning balance	$ 8,128,522	$ 8,150,987
Depreciation expense	(22,465)	(22,465)
Ending balance	8,356,772	8,128,522
Other increases (decreases)	250,715
Gross Carrying Amount [Member]
Disclosure of detailed information about investment property [Line Items]
Beginning balance	8,938,662	8,938,662
Ending balance	9,189,377	8,938,662
Other increases (decreases)	250,715
Accumulated Depreciation, Amortization and Impairment [Member]
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(810,140)	(787,675)
Depreciation expense	(22,465)	(22,465)
Ending balance	$ (832,605)	$ (810,140)

Investment Property - Additiona

Investment Property - Additional Information (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about investment property [Line Items]
Amount of disposal of investment properties	$ 0	$ 0	$ 1,800,933
Investment property	8,356,772	8,128,522	$ 8,150,987
At fair value [member]
Disclosure of detailed information about investment property [Line Items]
Investment property	$ 9,758,782	$ 11,567,758

Investment Property - Summar142

Investment Property - Summary of Income and Expenses from Investment Properties (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Rental Income From Investment Property Net Of Direct Operating Expense [Abstract]
Rental income from investment properties	$ 192,719	$ 167,429	$ 163,660
Income from the sale of investment properties	0	0	1,800,933
Direct operating expense from investment properties generating rental income	(78,367)	(71,339)	(163,767)
Direct operating expense from investment properties not generating rental income			(337,770)
Total	$ 114,352	$ 96,090	$ 1,463,056

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense Benefit (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Tax Expense Income And Adjustments For Current Tax Of Prior Periods [Abstract]
Current income tax	$ (162,820,181)	$ (162,033,295)	$ (84,003,064)
Adjustments to current tax from the previous period	(1,127,646)	(710,740)	(7,307,511)
Other current tax benefit / (expense)	15,934,106	21,380,071	(34,995,137)
Current tax expense, net	(148,013,721)	(141,363,964)	(126,305,712)
Benefit / (expense) from deferred taxes for origination and reversal of temporary differences	4,671,420	29,960,782	16,693,113
Total deferred tax benefit / (expense)	4,671,420	29,960,782	16,693,113
Income tax expense	$ (143,342,301)	$ (111,403,182)	$ (109,612,599)

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Tax Expense (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]
Total tax income (expense) using statutory rate	(25.50%)	(24.00%)	(22.50%)
Tax effect of rates applied in other countries	0.05%
Tax effect of non-taxable revenues	5.67%	6.53%	2.12%
Tax effect of non-tax-deductible expenses	(3.11%)	(2.13%)	(4.61%)
Tax effect of adjustments to taxes in previous periods	(0.17%)	(0.11%)	(1.60%)
Price level restatement for tax purposes (investments and equity)	1.57%	3.24%	2.58%
Total adjustments to tax expense using statutory rate	4.00%	7.53%	(1.51%)
Income tax benefit (expense)	(21.50%)	(16.47%)	(24.01%)
ACCOUNTING INCOME BEFORE TAX	$ 666,760,212	$ 676,674,298	$ 456,580,763
Total tax income (expense) using statutory rate	(170,023,854)	(162,401,830)	(102,730,671)
Tax effect of rates applied in other countries	328,968
Tax effect of non-taxable revenues	37,774,743	44,163,296	9,674,087
Tax effect of non-tax-deductible expenses	(20,737,858)	(14,392,926)	(21,060,811)
Tax effect of adjustments to taxes in previous periods	(1,127,646)	(710,740)	(7,307,511)
Price level restatement for tax purposes (investments and equity)	10,443,346	21,939,018	11,812,307
Total adjustments to tax expense using statutory rate	26,681,553	50,998,648	(6,881,928)
Income tax expense	$ (143,342,301)	$ (111,403,182)	$ (109,612,599)

Income Taxes - Summary of Origi

Income Taxes - Summary of Origination and Changes in Deferred Tax Assets and Liabilities (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income taxes [line items]
Increase (decrease) in other comprehensive income	$ (25,702,096)	$ (19,327,413)	$ 33,193,251
Deferred Tax Assets Liabilities [Member]
Disclosure of income taxes [line items]
Assets	2,837,792	21,796,517
Liabilities	(172,223,681)	(199,364,794)
Beginning balance	(177,568,277)	(171,330,505)
Increase (decrease) in profit or loss	4,671,420	27,310,360
Increase (decrease) in other comprehensive income	(464,053)	1,788,821
Recognized directly in equity		(30,829,099)
Foreign currency translation	32,866	28,133
Transfers to (from) non-current assets and disposals group held for sale		(40,896)
Other increases (decreases)	3,942,155	(4,495,091)
Ending balance	(169,385,889)	(177,568,277)	(171,330,505)
Deferred Tax Assets Liabilities [Member] | Tax Relating To Accumulated Depreciation
Disclosure of income taxes [line items]
Assets	162,315	5,465,105
Liabilities	(263,847,598)	(246,373,416)
Beginning balance	(240,908,311)	(265,258,085)
Increase (decrease) in profit or loss	(22,836,691)	24,331,401
Foreign currency translation	61,222	15,488
Other increases (decreases)	(1,503)	2,885
Ending balance	(263,685,283)	(240,908,311)	(265,258,085)
Deferred Tax Assets Liabilities [Member] | Tax Relating To Provisions
Disclosure of income taxes [line items]
Assets	39,890,472	36,785,893
Liabilities		(342,283)
Beginning balance	36,443,610	33,240,241
Increase (decrease) in profit or loss	2,940,867	3,203,369
Transfers to (from) non-current assets and disposals group held for sale		(62,749)
Other increases (decreases)	505,995	62,749
Ending balance	39,890,472	36,443,610	33,240,241
Deferred Tax Assets Liabilities [Member] | Tax Relating To Post Employment Benefit Obligations
Disclosure of income taxes [line items]
Assets	6,336,920	6,795,806
Liabilities	(364,925)	(579,978)
Beginning balance	6,215,828	5,236,522
Increase (decrease) in profit or loss	976,808	(807,693)
Increase (decrease) in other comprehensive income	(463,556)	1,786,999
Transfers to (from) non-current assets and disposals group held for sale		21,853
Other increases (decreases)	(757,085)	(21,853)
Ending balance	5,971,995	6,215,828	5,236,522
Deferred Tax Assets Liabilities [Member] | Tax Loss Carryforward
Disclosure of income taxes [line items]
Assets	9,536,102	11,911,396
Beginning balance	11,911,396	12,084,821
Increase (decrease) in profit or loss	(2,375,294)	(173,368)
Other increases (decreases)		(57)
Ending balance	9,536,102	11,911,396	12,084,821
Deferred Tax Assets Liabilities [Member] | Other Taxes
Disclosure of income taxes [line items]
Assets	49,635,500	21,979,742
Liabilities	(10,734,675)	(13,210,542)
Beginning balance	8,769,200	43,365,996
Increase (decrease) in profit or loss	25,965,730	756,651
Increase (decrease) in other comprehensive income	(497)	1,822
Recognized directly in equity		(30,829,099)
Foreign currency translation	(28,356)	12,645
Other increases (decreases)	4,194,748	(4,538,815)
Ending balance	38,900,825	8,769,200	$ 43,365,996
Deferred Tax Assets Liabilities [Member] | Deferred Tax Assets/Liabilities before compensation [Member]
Disclosure of income taxes [line items]
Assets	105,561,309	82,937,942
Liabilities	(274,947,198)	(260,506,219)
Deferred Tax Assets Liabilities [Member] | Compensation of Assets (Liabilities) for deferred taxes [Member]
Disclosure of income taxes [line items]
Assets	(102,723,517)	(61,141,425)
Liabilities	$ 102,723,517	$ 61,141,425

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - CLP ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2017
Disclosure of income taxes [line items]
Unrecognized deferred tax assets tax loss carryforwards	$ 0			$ 0
Temporary differences associated with investments in subsidiaries and joint ventures	1,145,437,791,000			1,143,608,396,000
Deferred tax asset not recognized for deductible temporary differences	$ 399,626,044,000			$ 257,883,751,000
Applicable tax rate under integrated system	24.00%	22.50%	21.00%
2017 [Member]
Disclosure of income taxes [line items]
Applicable tax rate under integrated system	25.00%
Applicable tax rate under integrated system	25.50%
2018 [Member]
Disclosure of income taxes [line items]
Applicable tax rate under integrated system	27.00%

Income Taxes - Effects of Defer

Income Taxes - Effects of Deferred Tax on Components of Other Comprehensive Income (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income taxes [line items]
Income tax related to available-for-sale financial assets	$ (497)	$ 1,820	$ (290)
Income tax related to cash flow hedge	(25,701,599)	(21,116,232)	31,868,299
Income tax related to defined benefit plans	(463,556)	1,786,999	1,325,242
Income tax related to components of other comprehensive income	25,702,096	19,327,413	(33,193,251)
Amount Before Tax [Member]
Disclosure of income taxes [line items]
Income tax related to available-for-sale financial assets	1,840	(6,740)	1,077
Income tax related to cash flow hedge	97,558,961	89,068,357	(122,593,576)
Share of other comprehensive income from associates and joint ventures accounted for using the equity method	(1,490)	(11,691,075)	(577,862)
Foreign currency translation	(3,686,549)	(3,532,844)	162,373
Income tax related to defined benefit plans	1,716,875	(6,618,514)	(5,645,532)
Income tax related to components of other comprehensive income	95,589,637	67,219,184	(128,653,520)
Income Tax Expense (Benefit) [Member]
Disclosure of income taxes [line items]
Income tax related to available-for-sale financial assets	(497)	1,820	(290)
Income tax related to cash flow hedge	(25,701,599)	(21,116,232)	31,868,299
Income tax related to defined benefit plans	(463,556)	1,786,999	1,325,242
Income tax related to components of other comprehensive income	(26,165,652)	(19,327,413)	33,193,251
Amount After Tax [Member]
Disclosure of income taxes [line items]
Income tax related to available-for-sale financial assets	1,343	(4,920)	787
Income tax related to cash flow hedge	71,857,362	67,952,125	(90,725,277)
Share of other comprehensive income from associates and joint ventures accounted for using the equity method	(1,490)	(11,691,075)	(577,862)
Foreign currency translation	(3,686,549)	(3,532,844)	162,373
Income tax related to defined benefit plans	1,253,319	(4,831,515)	(4,320,290)
Income tax related to components of other comprehensive income	$ 69,423,985	$ 47,891,771	$ (95,460,269)

Income Taxes - Movements in Def

Income Taxes - Movements in Deferred Taxes for Components of Other Comprehensive Income (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Relating To Components Of Other Comprehensive Income [Abstract]
Total increases (decreases) for deferred taxes of other comprehensive income from continuing operations	$ (497)	$ 1,788,821	$ 1,724,427
Income tax of changes in cash flow hedge transactions	(25,701,599)	(21,116,234)	31,468,824
Total income tax relating to components of other comprehensive income	$ (25,702,096)	$ (19,327,413)	$ 33,193,251

Other Financial Liabilities - S

Other Financial Liabilities - Schedule of Balances of Other Financial Liabilities (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Other financial liabilities, Current	$ 18,815,448	$ 25,696,166
Other financial liabilities, Non-current	781,978,145	854,016,751
Interest-Bearing Borrowings [Member]
Disclosure Of Financial Liabilities [Line Items]
Other financial liabilities, Current	17,255,692	18,013,114
Other financial liabilities, Non-current	760,932,929	802,046,968
Hedging Derivatives [Member]
Disclosure Of Financial Liabilities [Line Items]
Other financial liabilities, Current	304,278	313,571
Other financial liabilities, Non-current	21,045,216	48,981,953
Non-Hedging Derivatives [Member]
Disclosure Of Financial Liabilities [Line Items]
Other financial liabilities, Current	$ 1,255,478	7,369,481
Other financial liabilities, Non-current		$ 2,987,830

Other Financial Liabilities 150

Other Financial Liabilities - Schedule of Interest-bearing Borrowings (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current	$ 17,255,692	$ 18,013,114
Non-current	760,932,929	802,046,968
Bank Loans [Member]
Disclosure Of Financial Liabilities [Line Items]
Current	122	4,274
Unsecured Obligations [Member]
Disclosure Of Financial Liabilities [Line Items]
Current	15,455,782	16,168,473
Non-current	748,123,803	786,137,688
Financial Leases [Member]
Disclosure Of Financial Liabilities [Line Items]
Current	1,799,788	1,840,367
Non-current	$ 12,809,126	$ 15,909,280

Other Financial Liabilities 151

Other Financial Liabilities - Summary of Bank Loans by Currency Maturity (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Bank Loans [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	122	4,274
Bank Loans [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Bank Loans [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Secured/ Unsecured	Unsecured
Current, Maturity	$ 122	$ 4,274
Bank Loans [Member] | Chile [Member] | One to Three Months [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274

Other Financial Liabilities - A

Other Financial Liabilities - Additional Information (Detail) - CLP ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Secured liabilities	$ 0	$ 0
Undrawn line of credits	199,271,103,000	342,827,047,000
Cash flow hedge [Member]
Disclosure Of Financial Liabilities [Line Items]
Borrowings	440,823,086,000	480,061,539,000
Level 2 [Member]
Disclosure Of Financial Liabilities [Line Items]
Fair value of current and non-current unsecured liabilities	947,565,989,000	998,383,047,000
Bank Loans [Member] | Level 2 [Member]
Disclosure Of Financial Liabilities [Line Items]
Borrowings	$ 122,000	$ 4,274,000

Other Financial Liabilities 153

Other Financial Liabilities - Summary of Identification of Bank Borrowings by Company (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Banco Santander [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Amortization	At maturity	At maturity
Current, Maturity	$ 12	$ 2,135
Banco De Credito E Inversiones [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Amortization	At maturity	At maturity
Current, Maturity	$ 97	$ 2,037
Banco De Credito E Inversiones [Member] | Enel Distribucion Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Amortization	At maturity	At maturity
Current, Maturity	$ 13	$ 102
Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	122	4,274
Less than 90 Days [Member] | Banco Santander [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	12	2,135
Less than 90 Days [Member] | Banco De Credito E Inversiones [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	97	2,037
Less than 90 Days [Member] | Banco De Credito E Inversiones [Member] | Enel Distribucion Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 13	$ 102

Other Financial Liabilities 154

Other Financial Liabilities - Summary of Unsecured Liabilities by Currency and Maturity (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 15,455,782	$ 16,168,473
Non-current, Maturity	$ 748,123,803	$ 786,137,688
U.S. Dollar [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.99%	6.99%
Nominal Annual Rate	6.90%	6.90%
Current, Maturity	$ 8,528,350	$ 9,287,472
Non-current, Maturity	$ 430,228,859	$ 468,578,474
Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Annual Rate	5.48%	5.48%
Current, Maturity	$ 6,927,432	$ 6,881,001
Non-current, Maturity	317,894,944	317,559,214
One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,322,081	6,884,819
One to Three Months [Member] | U.S. Dollar [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,322,081	6,884,819
Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	9,133,701	9,283,654
Three to Twelve Months [Member] | U.S. Dollar [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	2,206,269	2,402,653
Three to Twelve Months [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,927,432	6,881,001
One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
One to Two Years [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Two to Three Years [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Three to Four Years [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Four to Five Years [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	725,827,751	764,216,168
More Than Five Years [Member] | U.S. Dollar [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	430,228,859	468,578,474
More Than Five Years [Member] | Unidades de Fomento [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 295,598,892	$ 295,637,694

Other Financial Liabilities 155

Other Financial Liabilities - Summary of Unsecured Liabilities by Company (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 15,455,782	$ 16,168,473
Non-current, Maturity	748,123,803	786,137,688
One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	725,827,751	764,216,168
Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,322,081	6,884,819
More than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 9,133,701	$ 9,283,654
BNY Mellon -Primera Emision S-1 [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Taxpayer ID Number	Foreign	Foreign
Effective Interest Rate	7.96%	7.96%
Nominal Interest Rate	7.88%	7.88%
Current, Maturity	$ 4,152,926	$ 4,522,585
Non-current, Maturity	125,566,611	136,759,395
BNY Mellon -Primera Emision S-1 [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	125,566,611	136,759,395
BNY Mellon -Primera Emision S-1 [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 4,152,926	$ 4,522,585
BNY Mellon - Primera Emision S-2 [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Taxpayer ID Number	Foreign	Foreign
Effective Interest Rate	7.40%	7.40%
Nominal Interest Rate	7.33%	7.33%
Current, Maturity	$ 1,328,023	$ 1,446,232
Non-current, Maturity	42,902,198	46,792,429
BNY Mellon - Primera Emision S-2 [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	42,902,198	46,792,429
BNY Mellon - Primera Emision S-2 [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 1,328,023	$ 1,446,232
BNY Mellon Primera Emision Three [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Taxpayer ID Number	Foreign	Foreign
Effective Interest Rate	8.26%	8.26%
Nominal Interest Rate	8.13%	8.13%
Current, Maturity	$ 841,132	$ 916,002
Non-current, Maturity	19,398,499	21,608,757
BNY Mellon Primera Emision Three [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	19,398,499	21,608,757
BNY Mellon Primera Emision Three [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 841,132	$ 916,002
BNY Mellon - Unica 24296 [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Taxpayer ID Number	Foreign	Foreign
Effective Interest Rate	4.32%	4.32%
Nominal Interest Rate	4.25%	4.25%
Current, Maturity	$ 2,206,269	$ 2,402,653
Non-current, Maturity	242,361,551	263,417,893
BNY Mellon - Unica 24296 [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	242,361,551	263,417,893
BNY Mellon - Unica 24296 [Member] | More than 90 Days [Member] | U.S. Dollars [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 2,206,269	$ 2,402,653
Banco Santander -317 Serie-H [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	7.17%	7.17%
Nominal Interest Rate	6.20%	6.20%
Current, Maturity	$ 6,374,051	$ 6,337,021
Non-current, Maturity	53,168,588	57,509,284
Banco Santander -317 Serie-H [Member] | One to Two Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Banco Santander -317 Serie-H [Member] | Two to Three Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Banco Santander -317 Serie-H [Member] | Three to Four Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Banco Santander -317 Serie-H [Member] | Four to Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Banco Santander -317 Serie-H [Member] | More Than Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	30,872,536	35,587,764
Banco Santander -317 Serie-H [Member] | More than 90 Days [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 6,374,051	$ 6,337,021
Banco Santander 522 Serie-M [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	4.82%	4.82%
Nominal Interest Rate	4.75%	4.75%
Current, Maturity	$ 553,381	$ 543,980
Non-current, Maturity	264,726,356	260,049,930
Banco Santander 522 Serie-M [Member] | More Than Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	264,726,356	260,049,930
Banco Santander 522 Serie-M [Member] | More than 90 Days [Member] | Unidades de Fomento [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 553,381	$ 543,980

Other Financial Liabilities 156

Other Financial Liabilities - Summary of Detail of Finance Lease Obligations (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Other Financial Liabilities [Line Items]
Current finance lease liabilities	$ 1,799,788	$ 1,840,367
Non current finance lease liabilities	$ 12,809,126	$ 15,909,280
Chile [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Nominal Interest Rate	6.90%	6.90%
Less than 90 Days [Member]
Disclosure of Other Financial Liabilities [Line Items]
Current finance lease liabilities	$ 439,377	$ 449,283
More than 90 Days [Member]
Disclosure of Other Financial Liabilities [Line Items]
Current finance lease liabilities	1,360,411	1,391,084
One to Two Years [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,459,000	2,677,880
Two to Three Years [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	1,916,774	2,677,880
Three to Four Years [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,041,364	1,959,990
Four to Five Years [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,174,053	2,087,390
More Than Five Years [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	$ 4,217,935	$ 6,506,140
Enel Generación Chile S.A. [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Taxpayer ID Number	76.555.400-4	76.555.400-4
Nominal Interest Rate	6.50%	6.50%
Current finance lease liabilities	$ 1,799,788	$ 1,840,367
Non current finance lease liabilities	12,809,126	15,909,280
Enel Generación Chile S.A. [Member] | Less than 90 Days [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Current finance lease liabilities	439,377	449,283
Enel Generación Chile S.A. [Member] | More than 90 Days [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Current finance lease liabilities	1,360,411	1,391,084
Enel Generación Chile S.A. [Member] | One to Two Years [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,459,000	2,677,880
Enel Generación Chile S.A. [Member] | Two to Three Years [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	1,916,774	2,677,880
Enel Generación Chile S.A. [Member] | Three to Four Years [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,041,364	1,959,990
Enel Generación Chile S.A. [Member] | Four to Five Years [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	2,174,053	2,087,390
Enel Generación Chile S.A. [Member] | More Than Five Years [Member] | Chile [Member] | Transelec S A [Member] | U.S. Dollar [Member]
Disclosure of Other Financial Liabilities [Line Items]
Non current finance lease liabilities	$ 4,217,935	$ 6,506,140

Other Financial Liabilities 157

Other Financial Liabilities - Summary of Changes in Reserve for Cash Flow Hedges (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Other Financial Liabilities [Line Items]
Foreign currency exchange differences recognized in profit and loss, net	$ 8,516,874	$ 12,978,471	$ (51,277,332)
Reserve for Cash Flow Hedges [Member]
Disclosure of Other Financial Liabilities [Line Items]
Balance in hedging reserves (hedging income) at the beginning of the period, net	(52,747,646)	(74,953,393)	(39,805,098)
Foreign currency exchange differences recognized in equity, net	17,321,594	14,317,257	(38,579,730)
Foreign currency exchange differences recognized in profit and loss, net	8,258,044	7,888,490	3,431,435
Balance in hedging reserves (hedging income) at the end of the period, net	$ (27,168,008)	$ (52,747,646)	$ (74,953,393)

Risk Management Policy - Compar

Risk Management Policy - Comparative Structure of Financial Debt According to Fixed and /or Protected Interest Rate on Gross Debt (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]
Interest rate risk	92.00%	92.00%
Fixed interest rate [member]
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]
Interest rate risk	92.00%	92.00%

Risk Management Policy - Additi

Risk Management Policy - Additional Information (Detail) $ in Thousands, MMTBU_Henry_Hub in Millions, MMBTU in Millions	12 Months Ended
	Dec. 31, 2017CLP ($)MMBTU	Dec. 31, 2016CLP ($)MMBTUMMTBU_Henry_Hub	Dec. 31, 2015CLP ($)	Dec. 31, 2014CLP ($)
Disclosure Of Financial Risk Management [Line Items]
Cash and cash equivalent	$ 419,456,026	$ 245,999,192	$ 144,261,845	$ 133,015,629
VaR at confidence level, percentage	95.00%
Percentage of potential variations in fair value	5.00%
VaR amount	$ 66,890,686
Commodity Price Risk [Member] | Swap Hedges [Member]
Disclosure Of Financial Risk Management [Line Items]
Quantity of gas | MMBTU	2.3
Commodity Price Risk [Member] | Swap Hedges [Member] | Brent Oil [Member]
Disclosure Of Financial Risk Management [Line Items]
Future barrels on brent | MMBTU		3
Commodity Price Risk [Member] | Swap Hedges [Member] | Henry Hub Gas [Member]
Disclosure Of Financial Risk Management [Line Items]
Quantity of gas | MMTBU_Henry_Hub		3.3
Liquidity Risk [Member]
Disclosure Of Financial Risk Management [Line Items]
Cash and cash equivalent	$ 419,456,026	$ 245,999,192
Liquidity Risk [Member] | Lines of Credit [Member]
Disclosure Of Financial Risk Management [Line Items]
Available lines of long-term credit	$ 199,271,103	$ 342,827,047

Financial Instruments - Summary

Financial Instruments - Summary of Financial Assets Classified by Type and Category (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Assets [Line Items]
Hedging derivatives, current	$ 20,038,433	$ 121,443
Other financial assets	20,627,062	584,244
Hedging derivatives, non-current	30,789,703	25,533,189
Other financial assets	33,418,204	28,827,542
Financial Assets Held for Trading [Member]
Disclosure Of Financial Assets [Line Items]
Hedging derivatives, current	402,716
Total Current	402,716
Total	402,716
Held-to-maturity Investments [Member]
Disclosure Of Financial Assets [Line Items]
Other financial assets	185,913	462,801
Total Current	185,913	462,801
Other financial assets		652,733
Total Non-current		652,733
Total	185,913	1,115,534
Loans and Receivables [Member]
Disclosure Of Financial Assets [Line Items]
Other financial assets	478,880,650	464,235,411
Total Current	478,880,650	464,235,411
Other financial assets	36,182,399	33,500,105
Total Non-current	36,182,399	33,500,105
Total	515,063,049	497,735,516
Available-for-sale Financial Assets [Member]
Disclosure Of Financial Assets [Line Items]
Equity instruments	2,628,501	2,641,620
Total Non-current	2,628,501	2,641,620
Total	2,628,501	2,641,620
Derivatives Designated as Hedges [Member]
Disclosure Of Financial Assets [Line Items]
Hedging derivatives, current	20,038,433	121,443
Total Current	20,038,433	121,443
Hedging derivatives, non-current	30,789,703	25,533,189
Total Non-current	30,789,703	25,533,189
Total	$ 50,828,136	$ 25,654,632

Financial Instruments - Summ161

Financial Instruments - Summary of Financial Liabilities Classified by Type and Category (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Derivative instruments	$ 304,278	$ 313,571
Other financial liabilities	18,815,448	25,696,166
Derivative instruments	21,045,216	48,981,953
Other financial liabilities	781,978,145	854,016,751
Total	0	0
Financial Liabilities Held for Trading [Member]
Disclosure Of Financial Liabilities [Line Items]
Derivative instruments	1,255,478	7,369,481
Total Current	1,255,478	7,369,481
Derivative instruments		2,987,830
Total Non-current		2,987,830
Total	1,255,478	10,357,311
Loans and Payables [Member]
Disclosure Of Financial Liabilities [Line Items]
Interest-bearing loans	17,255,692	18,013,114
Other financial liabilities	670,642,077	617,955,794
Total Current	687,897,769	635,968,908
Interest-bearing loans	760,932,929	802,046,968
Other financial liabilities	978,342	1,734,640
Total Non-current	761,911,271	803,781,608
Total	1,449,809,040	1,439,750,516
Derivatives Designated as Hedges [Member]
Disclosure Of Financial Liabilities [Line Items]
Derivative instruments	304,278	313,571
Total Current	304,278	313,571
Derivative instruments	21,045,216	48,981,953
Total Non-current	21,045,216	48,981,953
Total	$ 21,349,494	$ 49,295,524

Financial Instruments - Summ162

Financial Instruments - Summary of Financial Derivative Transactions Qualifying as Hedge Instruments Resulted in Recognition of Assets and Liabilities (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Hedge Accounting [Line Items]
Assets Current	$ 20,038,433	$ 121,443
Assets Non-current	30,789,703	25,533,189
Liabilities Current	304,278	313,571
Liabilities Non-current	21,045,216	48,981,953
Cash flow hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Assets Current	20,038,433	121,443
Assets Non-current	30,789,703	25,533,189
Liabilities Current	304,278	313,571
Liabilities Non-current	21,045,216	48,981,953
Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Assets Current	20,038,433	121,443
Assets Non-current	30,789,703	25,533,189
Liabilities Current	304,278	313,571
Liabilities Non-current	$ 21,045,216	$ 48,981,953

Financial Instruments - Summ163

Financial Instruments - Summary of Hedge Derivative Instruments and Their Corresponding Hedged Instruments (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Hedge Accounting [Line Items]
Detail of hedging instrument	FORWARD
Description of hedging instrument	Exchange rate
Description of hedged item	Revenues
Fair value of hedged item	$ 21,782,581
Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Detail of hedging instrument	SWAP
Description of hedging instrument	Exchange rate
Description of hedged item	Unsecured obligations (bonds)
Fair value of hedged item	$ 7,696,061	$ (23,640,892)

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - CLP ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Financial Liabilities [Abstract]
Gains or losses recognized	$ 0	$ 0	$ 0
Financial liabilities	$ 0	$ 0

Financial Instruments - Summ165

Financial Instruments - Summary of Financial Derivative Transactions Recorded at Fair Value Through Profit or Loss Resulted in the Recognition of Assets and Liabilities (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Hedge Accounting [Line Items]
Current Assets	$ 20,038,433	$ 121,443
Liabilities Current	304,278	313,571
Non-Current Assets	30,789,703	25,533,189
Liabilities Non-current	21,045,216	48,981,953
Non-hedging derivative instrument [Member]
Disclosure Of Hedge Accounting [Line Items]
Current Assets	402,716
Liabilities Current	$ 1,255,478	7,369,481
Liabilities Non-current		$ 2,987,830

Financial Instruments - Summ166

Financial Instruments - Summary of Fair Value of Hedging and Non-hedging Derivatives Entered Into by the Group as Well as the Remaining Contractual Maturities (Detail) - CLP ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Hedge Accounting [Line Items]
Fair value	$ 28,625,880,000	$ (33,998,203,000)
Notional Amount	851,845,692,000	594,860,342,000
Derivatives not designated for hedge accounting [Member]
Disclosure Of Hedge Accounting [Line Items]
Fair value	(852,762,000)	(10,357,311,000)
Notional Amount	19,682,638,000	71,173,376,000
Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Fair value	29,478,642,000	(23,640,892,000)
Notional Amount	832,163,054,000	523,686,966,000
Less Than One Year [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	326,033,057,000	49,738,751,000
Less Than One Year [Member] | Derivatives not designated for hedge accounting [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	19,682,638,000	49,738,751,000
Less Than One Year [Member] | Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	306,350,419,000
One to Two Years [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	525,812,635,000	21,434,625,000
One to Two Years [Member] | Derivatives not designated for hedge accounting [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount		21,434,625,000
One to Two Years [Member] | Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	525,812,635,000
Two to Three Years [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount		523,686,966,000
Two to Three Years [Member] | Exchange rate hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount		523,686,966,000
Cash flow hedge [Member]
Disclosure Of Hedge Accounting [Line Items]
Fair value	29,478,642,000	(23,640,892,000)
Notional Amount	832,163,054,000	523,686,966,000
Cash flow hedge [Member] | Less Than One Year [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	306,350,419,000
Cash flow hedge [Member] | One to Two Years [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount	$ 525,812,635,000
Cash flow hedge [Member] | Two to Three Years [Member]
Disclosure Of Hedge Accounting [Line Items]
Notional Amount		$ 523,686,966,000

Financial instruments- Schedule

Financial instruments- Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	$ 0	$ 0
At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	66,947,598	42,715,419
Financial liabilities	23,493,998	60,756,041
Available For Sale Financial Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	33,158	25,381
Derivatives Designated as Hedges [Member] | Financial Derivatives Asset | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	50,828,136	25,654,632
Derivatives Designated as Hedges [Member] | Commodity Derivatives Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	5,742,633	16,159,565
Derivatives Designated as Hedges [Member] | Financial Derivatives Liability | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	21,349,494	49,295,524
Derivatives Designated as Hedges [Member] | Commodity Derivatives Liabilities | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	889,026	1,063,193
Derivatives not designated for hedge accounting [Member] | Financial Derivatives Asset | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	402,716
Derivatives not designated for hedge accounting [Member] | Commodity Derivatives Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	9,940,955	875,841
Derivatives not designated for hedge accounting [Member] | Financial Derivatives Liability | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	1,255,478	10,357,311
Derivatives not designated for hedge accounting [Member] | Commodity Derivatives Liabilities | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities		40,013
Level 1 [Member] | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	33,158	25,381
Level 1 [Member] | Available For Sale Financial Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	33,158	25,381
Level 2 [Member] | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	66,914,440	42,690,038
Financial liabilities	23,493,998	60,756,041
Level 2 [Member] | Derivatives Designated as Hedges [Member] | Financial Derivatives Asset | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	50,828,136	25,654,632
Level 2 [Member] | Derivatives Designated as Hedges [Member] | Commodity Derivatives Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	5,742,633	16,159,565
Level 2 [Member] | Derivatives Designated as Hedges [Member] | Financial Derivatives Liability | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	21,349,494	49,295,524
Level 2 [Member] | Derivatives Designated as Hedges [Member] | Commodity Derivatives Liabilities | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	889,026	1,063,193
Level 2 [Member] | Derivatives not designated for hedge accounting [Member] | Financial Derivatives Asset | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	402,716
Level 2 [Member] | Derivatives not designated for hedge accounting [Member] | Commodity Derivatives Assets | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	9,940,955	875,841
Level 2 [Member] | Derivatives not designated for hedge accounting [Member] | Financial Derivatives Liability | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	$ 1,255,478	10,357,311
Level 2 [Member] | Derivatives not designated for hedge accounting [Member] | Commodity Derivatives Liabilities | At fair value [member]
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities		$ 40,013

Trade and Other Current Paya168

Trade and Other Current Payables - Summary of Trade and Other Current Payables (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Trade And Other Payables [Line Items]
Trade and other current payables	$ 594,498,606	$ 561,505,283
Trade and other non-current payables	659,824	1,483,113
Energy suppliers [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	172,042,187	140,739,018
Fuel and gas suppliers [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	13,300,051	18,024,696
Subtotal Trade Payables [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	185,342,238	158,763,714
Payables for goods and services [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	170,859,517	166,241,384
Trade and other non-current payables	4,485	40,256
Dividends payable to third parties [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	95,150,149	97,094,197
Taxes payables other than income tax [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	17,648,643	11,581,921
VAT debit [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	25,766,224	22,396,497
Payable for assets acquisition [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	71,248,286	74,869,722
Warranty deposits [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	402,107	378,562
Other payables [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	614,554	1,226,898
Trade and other non-current payables	655,339	1,442,857
Accounts payable to staff [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	27,466,888	28,952,388
Subtotal Other Payables [Member]
Trade And Other Payables [Line Items]
Trade and other current payables	409,156,368	402,741,569
Trade and other non-current payables	$ 659,824	$ 1,483,113

Trade and Other Current Paya169

Trade and Other Current Payables - Summary of Trade and Other Current Payables (Parenthetical) (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Enel Distribucion Chile S.A. [Member]
Trade And Other Payables [Line Items]
Accrued expense	$ 4,501,709	$ 4,367,657

Provisions - Summary of Breakdo

Provisions - Summary of Breakdown of Provisions (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Other Provisions [Abstract]
Provision for legal proceedings, current	$ 3,497,786	$ 4,694,579
Decommissioning or restoration, current	0	0
Other provisions, current	2,138,385	1,798,953
Other current provisions, Total	5,636,171	6,493,532
Provision for legal proceedings, non-current	13,936,190	5,308,206
Decommissioning or restoration, non-current	64,486,647	57,798,702
Other provisions, non-current	0	0
Other long-term provisions, Total	$ 78,422,837	$ 63,106,908

Provisions - Summary of Changes

Provisions - Summary of Changes in Provisions (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other provisions [Line Items]
Beginning balance	$ 69,600,440	$ 72,445,335
Increase (decrease) in existing provisions	16,840,210	(457,805)
Provisions used	(2,995,017)	(4,948,439)
Reversal of unused provision	(1,728,788)
Increase from adjustment to time value of money	2,347,087	2,551,212
Foreign currency translation	(4,924)	10,137
Total changes in provisions	14,458,568	(2,844,895)
Ending balance	84,059,008	69,600,440
Legal Proceedings [Member]
Disclosure of other provisions [Line Items]
Beginning balance	10,002,785	14,829,364
Increase (decrease) in existing provisions	12,159,920	111,723
Provisions used	(2,995,017)	(4,948,439)
Reversal of unused provision	(1,728,788)
Foreign currency translation	(4,924)	10,137
Total changes in provisions	7,431,191	(4,826,579)
Ending balance	17,433,976	10,002,785
Decommissioning or Restoration [Member]
Disclosure of other provisions [Line Items]
Beginning balance	57,798,702	51,085,542
Increase (decrease) in existing provisions	4,340,858	4,161,948
Increase from adjustment to time value of money	2,347,087	2,551,212
Total changes in provisions	6,687,945	6,713,160
Ending balance	64,486,647	57,798,702
Environment and Other Provisions [Member]
Disclosure of other provisions [Line Items]
Beginning balance	1,798,953	6,530,429
Increase (decrease) in existing provisions	339,432	(4,731,476)
Total changes in provisions	339,432	(4,731,476)
Ending balance	$ 2,138,385	$ 1,798,953

Provisions - Summary of Chan172

Provisions - Summary of Changes in Provisions (Parenthetical) (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other provisions [Line Items]
Increase (decrease) in existing provisions	$ 16,840,210	$ (457,805)
Electricity and Fuels [Member]
Disclosure of other provisions [Line Items]
Increase (decrease) in existing provisions	$ 11,840,322

Employee Benefit Obligations -

Employee Benefit Obligations - Summary of Post Employment Obligations Associated with Defined Benefits Plan (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Defined Benefit Plans [Abstract]
Post-employment obligations	$ 57,081,924	$ 59,934,127	$ 55,023,456
Total post-employment obligations, net	$ 57,081,924	$ 59,934,127	$ 55,023,456

Employee Benefit Obligations174

Employee Benefit Obligations - Summary of Defined Benefit Plans Expense Recognized in Statements of Comprehensive Income (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Net Defined Benefit Recognized In Consolidated Statement Of Comprehensive Income [Line Items]
Interest cost for defined benefits plan	$ 2,678,300	$ 2,517,406	$ 2,299,944
Other Comprehensive Income [Member]
Disclosure Of Net Defined Benefit Recognized In Consolidated Statement Of Comprehensive Income [Line Items]
Current service cost for defined benefits plan	2,091,205	1,899,660	2,282,226
Interest cost for defined benefits plan	2,678,300	2,517,406	2,299,944
Expenses recognized in the Statement of Income	4,769,505	4,417,066	4,582,170
Gains (losses) from remeasurement of defined benefit plans	(1,716,875)	6,618,514	5,645,532
Total expense recognized in the Statement of Comprehensive Income	$ 3,052,630	$ 11,035,580	$ 10,227,702

Employee Benefit Obligations175

Employee Benefit Obligations - Summary of Changes in Post-employment Defined Benefit Obligations (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Net Defined Benefit Liability Asset [Abstract]
Beginning balance	$ 59,934,127	$ 55,023,456	$ 53,937,842
Current service cost	2,091,205	1,899,660	2,282,226
Net Interest cost	2,678,300	2,517,406	2,299,944
Actuarial (gains) losses from changes in financial assumptions	(1,414,201)	1,073,475	2,549,816
Actuarial (gains) losses from changes in experience adjustments	(302,674)	5,545,039	3,095,716
Foreign currency translation			(697)
Benefits paid	(5,917,552)	(7,771,781)	(9,008,811)
Transfers of employees	12,719	1,337,621
Other		309,251	(132,580)
Ending balance	$ 57,081,924	$ 59,934,127	$ 55,023,456

Employee Benefit Obligations176

Employee Benefit Obligations - Summary of Assumptions Used in Actuarial Calculation of Defined Benefits (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Abstract]
Discount rates used	5.00%	4.70%	5.00%
Expected rate of salary increases	4.00%	4.00%	4.00%
Turnover rate	4.57%	4.72%	4.89%
Mortality tables	CB-H-2014 / RV-M-2014	CB-H-2014 / RV-M-2014	RV2009

Employee Benefit Obligations177

Employee Benefit Obligations - Additional Information (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Defined Benefit Plans [Abstract]
Post-employment benefits to variations	1.00%
Discount rate assumes a increase	$ 4,773,942	$ 5,241,395
Discount rate assumes a decrease	4,269,704	$ 4,665,915
Defined benefit plans will increase	$ 5,558,032
Weighted average term	9 years 2 months 4 days

Employee Benefit Obligations178

Employee Benefit Obligations - Summary of Expected Flow for Benefits for Next Five Years (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017CLP ($)
Less Than One Year [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	$ 5,558,032
One to Two Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	4,970,959
Two to Three Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	4,203,682
Three to Four Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	5,105,974
Four to Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	4,917,461
More Than Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	$ 22,844,851

Equity - Additional Information

Equity - Additional Information (Detail) - CLP ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Shareholders Equity [Line Items]
Issued capital	$ 2,229,108,975,000	$ 2,229,108,975,000
Enel Generación Chile S.A. [Member]
Disclosure Of Shareholders Equity [Line Items]
Restricted net asset value	456,844,078,000	$ 458,309,294,000
Enersis S. A. [Member]
Disclosure Of Shareholders Equity [Line Items]
Issued capital	$ 2,229,108,974,538
Number of shares outstanding	49,092,772,762

Equity - Summary of Dividends P

Equity - Summary of Dividends Paid (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Final Dividends [Member]
Disclosure of Dividends [Line Items]
Type of Dividend		Final	Final
Payment Date		May 26, 2017	May 24, 2016
Pesos per Share		$ 2.47546	$ 2.09338
Charged to		2,016	2,015
Interim Dividends [Member]
Disclosure of Dividends [Line Items]
Type of Dividend	Interim	Interim
Payment Date	Jan. 26, 2018	Jan. 27, 2017
Pesos per Share	$ 0.75642	$ 0.75884
Charged to	2,017	2,016

Equity - Summary of Foreign Cur

Equity - Summary of Foreign Currency Translation Adjustments (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL	$ 3,786,961,657	$ 3,462,993,642	$ 3,201,900,783	$ 3,084,065,791
Reserve for Exchange Differences in Translation [Member]
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL	6,976,383	9,222,933	12,423,692	$ 11,443,966
Reserve for Exchange Differences in Translation [Member] | GasAtacama Chile S.A. [Member]
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL	6,416,189	8,484,094	9,582,184
Reserve for Exchange Differences in Translation [Member] | Electrogas [Member]
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL			1,875,303
Reserve for Exchange Differences in Translation [Member] | GNL Chile S.A. [Member]
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL	$ 560,194	$ 738,839	328,447
Reserve for Exchange Differences in Translation [Member] | GNL Quintero S.A. [Member]
Disclosure Of Foreign Currency Translation Reserves [Line Items]
TOTAL			$ 637,758

Equity - Summary of Other Reser

Equity - Summary of Other Reserves Within Equity (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	$ (1,035,092,978)	$ (958,589,952)	$ (928,879,218)
Other reserves, Changes	37,762,430	(76,503,026)	(29,710,734)
Other reserves, Ending balance	(997,330,548)	(1,035,092,978)	(958,589,952)
Reserve for Exchange Differences in Translation [Member]
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	9,222,933	12,423,692	11,443,966
Other reserves, Changes	(2,246,550)	(3,200,759)	979,726
Other reserves, Ending balance	6,976,383	9,222,933	12,423,692
Reserve for Cash Flow Hedges [Member]
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	(76,218,470)	(121,503,052)	(66,850,863)
Other reserves, Changes	43,368,734	45,284,582	(54,652,189)
Other reserves, Ending balance	(32,849,736)	(76,218,470)	(121,503,052)
Available-for-sale Financial Assets [Member]
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	9,955	14,835	14,046
Other reserves, Changes	1,329	(4,880)	789
Other reserves, Ending balance	11,284	9,955	14,835
Other Comprehensive Income from Non-current Assets Held for Sale [Member]
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	1,632,724
Other reserves, Changes	(1,632,724)	1,632,724
Other reserves, Ending balance		1,632,724
Other Miscellaneous Reserves [Member]
Disclosure Of Other Reserves [Line Items]
Other reserves, Beginning balance	(969,740,120)	(849,525,427)	(873,486,367)
Other reserves, Changes	(1,728,359)	(120,214,693)	23,960,940
Other reserves, Ending balance	$ (971,468,479)	$ (969,740,120)	$ (849,525,427)

Equity - Summary of Other Misce

Equity - Summary of Other Miscellaneous Reserves Within Equity (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Other Reserves [Line Items]
Other miscellaneous reserves	$ (971,468,479)	$ (969,740,120)	$ (849,525,427)
Reserve for Corporate Reorganization [Member]
Disclosure Of Other Reserves [Line Items]
Other miscellaneous reserves	(534,057,733)	(532,330,290)	(421,335,641)
Reserve for Transition to IFRS [Member]
Disclosure Of Other Reserves [Line Items]
Other miscellaneous reserves	(457,221,836)	(457,221,836)	(457,221,836)
Reserve for Subsidiaries Transactions [Member]
Disclosure Of Other Reserves [Line Items]
Other miscellaneous reserves	12,502,494	12,502,494	12,502,494
Other Miscellaneous Reserves [Member]
Disclosure Of Other Reserves [Line Items]
Other miscellaneous reserves	$ 7,308,596	$ 7,309,512	$ 16,529,556

Equity - Summary of Other Mi184

Equity - Summary of Other Miscellaneous Reserves Within Equity (Parenthetical) (Detail) $ in Thousands, S/ in Millions	1 Months Ended
	Apr. 30, 2016CLP ($)	Apr. 30, 2016PEN (S/)	Mar. 31, 2016CLP ($)	Mar. 31, 2016PEN (S/)	Dec. 31, 2017CLP ($)
Disclosure Of Other Reserves [Abstract]
Tax payment made on spin-off	$ 15,193,186	S/ 74	$ 100,978,571	S/ 577
Effect of equity due to spin off					$ 90,274,727,000

Equity - Summary of Non-control

Equity - Summary of Non-controlling Interests (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Non-controlling Interests, Equity	$ 803,577,647	$ 699,602,354	$ 609,219,281
Non-controlling Interests, Profit (Loss)	$ 174,035,269	181,111,251	95,129,754
Enel Distribucion Chile S.A. [Member]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Percentage of non-controlling interests	0.91%
Non-controlling Interests, Equity	$ 6,223,363	6,441,611	5,751,343
Non-controlling Interests, Profit (Loss)	$ 961,490	1,210,871	1,294,111
Enel Generación Chile S.A. [Member]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Percentage of non-controlling interests	40.02%
Non-controlling Interests, Equity	$ 784,999,394	680,725,188	590,091,089
Non-controlling Interests, Profit (Loss)	$ 167,465,216	173,299,349	84,976,889
Empresa Electrica Pehuenche S.A. [Member]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Percentage of non-controlling interests	7.35%
Non-controlling Interests, Equity	$ 9,963,472	10,008,502	10,900,863
Non-controlling Interests, Profit (Loss)	$ 5,649,253	6,512,893	8,674,207
Sociedad Agricola de Cameros Ltda. [Member]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Percentage of non-controlling interests	42.50%
Non-controlling Interests, Equity	$ 2,596,764	2,636,470	2,675,177
Non-controlling Interests, Profit (Loss)	(39,706)	(38,707)	191,838
Others [Member]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]
Non-controlling Interests, Equity	(205,346)	(209,417)	(199,191)
Non-controlling Interests, Profit (Loss)	$ (984)	$ 126,845	$ (7,291)

Revenue and Other Operating 186

Revenue and Other Operating Income - Summary of Revenues and Other Operating Income (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of goods	$ 107,362,797	$ 73,607,457	$ 32,057,524
Total Revenues	2,490,470,178	2,515,843,880	2,384,293,189
Mutual support			14,563
Commodity derivatives	20,328,649	10,794,682	1,820,371
Other income	18,548,051	14,928,257	12,901,017
Total other income	38,876,700	25,722,939	14,735,951
Sales of Products and Services [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of goods	15,710,090	9,163,742	19,474,753
Energy Sales [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	2,268,459,154	2,312,643,619	2,247,363,757
Generation [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	1,082,749,256	1,141,725,803	1,134,450,921
Generation [Member] | Regulated Customers [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	726,166,640	805,079,958	726,264,558
Generation [Member] | Non-regulated Customers [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	285,623,737	234,641,908	264,113,111
Generation [Member] | Spot Market Sales [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	70,958,879	102,003,937	140,339,722
Generation [Member] | Others [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity			3,733,530
Distribution [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	1,185,709,898	1,170,917,816	1,112,912,836
Distribution [Member] | Others [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	131,227,735	130,390,337	124,903,393
Distribution [Member] | Residential [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	442,137,827	431,610,828	407,435,626
Distribution [Member] | Business [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	386,608,105	379,037,776	350,157,120
Distribution [Member] | Industrial [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of electricity	225,736,231	229,878,875	230,416,697
Natural Gas Sales [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from sale of goods	91,652,707	64,443,715	12,582,771
Revenue from Other Services [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	114,648,227	129,592,804	104,871,908
Revenue from Other Services [Member] | Tolls and Transmission [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	39,812,005	51,014,073	37,958,975
Revenue from Other Services [Member] | Metering Equipment Leases [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	4,945,609	4,555,779	4,415,191
Revenue from Other Services [Member] | Public Lighting [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	13,449,852	12,660,894	10,859,012
Revenue from Other Services [Member] | Engineering and Consulting Services [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	3,414,472	14,304,336	1,817,284
Revenue from Other Services [Member] | Other Services [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenue from rendering of services	$ 53,026,289	$ 47,057,722	$ 49,821,446

Revenue and Other Operating 187

Revenue and Other Operating Income - Summary of Revenues and Other Operating Income (Parenthetical) (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenues from services for construction of junctions	$ 15,514,433	$ 14,359,194	$ 16,289,581
Revenues from works in specific facilities and networks	15,125,128	21,397,176	16,736,234
Revenues from other services	22,386,728	11,301,352	11,741,987
Revenues from energy losses recoveries	1,968,203	1,344,529
Revenues from outdated collection of invoices	1,299,470	1,540,348
Revenues from other operating income services	15,280,378	12,043,380	4,877,987
Revenues from water sales			823,821
Others [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenues from energy sales	69,170,597	69,340,228	61,510,586
Municipalities [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenues from energy sales	36,165,698	37,338,741	39,405,365
Government Entities [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenues from energy sales	20,080,121	18,333,375	18,631,045
Agricultural Sector Entities [Member]
Disclosure Of Revenue And Other Operating Income [Line Items]
Revenues from energy sales	$ 5,811,319	$ 5,377,993	$ 5,356,396

Raw Materials and Consumable188

Raw Materials and Consumables Used - Schedule of Raw Materials and Consumables Used (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis Of Income And Expense [Abstract]
Energy purchases	$ (902,434,871)	$ (891,746,884)	$ (860,203,181)
Fuel consumption	(280,739,362)	(295,148,838)	(327,502,996)
Transportation costs	(155,879,249)	(195,123,118)	(182,453,155)
Other raw materials and consumables	(182,102,035)	(115,400,740)	(111,826,227)
Total	$ (1,521,155,517)	$ (1,497,419,580)	$ (1,481,985,559)

Employee Benefits Expense - Sum

Employee Benefits Expense - Summary of Employee Expenses (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Classes Of Employee Benefits Expense [Abstract]
Wages and salaries	$ (100,653,880)	$ (100,938,761)	$ (115,982,152)
Post-employment benefit obligations expense	(2,091,205)	(1,899,660)	(2,282,226)
Social security and other contributions	(18,758,692)	(21,260,007)	(18,290,343)
Total	$ (121,503,777)	$ (124,098,428)	$ (136,554,721)

Depreciation, Amortization a190

Depreciation, Amortization and Impairment Losses - Summary of Depreciation, Amortization and Impairment Losses (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation Amortisation And Impairment Loss Reversal Of Impairment Loss Recognised In Profit Or Loss [Abstract]
Depreciation	$ (145,873,065)	$ (155,826,620)	$ (148,421,514)
Amortization	(6,811,041)	(5,833,990)	(4,780,148)
Subtotal	(152,684,106)	(161,660,610)	(153,201,662)
Impairment loss recognized in the period’s profit or loss	(7,937,817)	(35,926,710)	3,054,903
Total	$ (160,621,923)	$ (197,587,320)	$ (150,146,759)

Depreciation, Amortization a191

Depreciation, Amortization and Impairment Losses - Summary of Depreciation, Amortization and Impairment losses (Parenthetical) (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Depreciation Amortization And Impairment Losses [Line Items]
Impairment losses of financial assets (See Note 8.d)	$ (7,937,817)	$ (5,141,179)	$ (7,110,308)
Impairment losses of property, plant and equipment (See Note 15)		(30,785,531)	10,165,211
Total	(7,937,817)	(35,926,710)	3,054,903
Generation [Member]
Disclosure Of Depreciation Amortization And Impairment Losses [Line Items]
Impairment losses of financial assets (See Note 8.d)	55,494		(371,558)
Impairment losses of property, plant and equipment (See Note 15)		(30,785,531)	10,165,211
Total	55,494	(30,785,531)	9,793,653
Distribution [Member]
Disclosure Of Depreciation Amortization And Impairment Losses [Line Items]
Impairment losses of financial assets (See Note 8.d)	(7,993,311)	(5,141,179)	(6,738,750)
Total	$ (7,993,311)	$ (5,141,179)	$ (6,738,750)

Other Expenses - Summary of Oth

Other Expenses - Summary of Other Miscellaneous Operating Expenses (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Cost And Expenses By Nature [Abstract]
Other supplies and services	$ (17,064,008)	$ (23,962,717)	$ (16,365,050)
Professional, outsourced and other services	(58,622,123)	(55,571,694)	(43,006,875)
Repairs and maintenance	(13,999,283)	(11,030,522)	(14,034,924)
Indemnities and fines	(776,011)	(3,046,557)	(1,754,069)
Taxes and charges	(5,105,235)	(4,972,995)	(7,406,215)
Insurance premiums	(13,277,718)	(17,148,278)	(15,942,047)
Leases and rental costs	(2,969,436)	(3,250,503)	(10,098,166)
Marketing, public relations and advertising	(2,501,027)	(3,736,414)	(3,166,181)
Written-off Huechún and Chillán projects		(36,480,223)
Written-off projects in progress	(25,105,911)
Other supplies	(11,188,148)	(6,132,681)	(6,041,038)
Travel expenses	(3,445,944)	(3,190,662)	(4,103,471)
Environmental expenses	(7,769,230)	(2,245,891)	(3,939,361)
Total	$ (161,824,074)	$ (170,769,137)	$ (125,857,397)

Other Gains (Losses) - Summary

Other Gains (Losses) - Summary of Other gains (losses) (Details) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Other Gain And Loss [Line Items]
Gain on sale of Electrogas	$ 105,311,912
Gain on sale of investment properties			$ 1,463,163
Gain on sale of assets	7,779,531
Other	149,753	$ 165,044	(225,129)
Total	$ 113,241,196	121,490,062	20,055,745
Alonso de Cordova [Member] | Buildings [Member]
Disclosure Of Other Gain And Loss [Line Items]
Gain on sale of building (Alonso de Cordova)			14,610,544
Tunel El Melon [Member]
Disclosure Of Other Gain And Loss [Line Items]
Gain on sale of equity interests in Tunel El Melon, GNL Quintero S.A., Maitenes and Aguas Santiago Poniente			$ 4,207,167
GNL Quintero S.A. [Member]
Disclosure Of Other Gain And Loss [Line Items]
Gain on sale of equity interests in Tunel El Melon, GNL Quintero S.A., Maitenes and Aguas Santiago Poniente		$ 121,325,018

Financial Results - Summary of

Financial Results - Summary of Financial Income and Costs (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial Results [Abstract]
Income from deposits and other financial instruments	$ 8,377,023	$ 5,733,428	$ 2,566,017
Interests charged to customers in energy accounts and billing	8,556,587
Other financial income	4,729,078	17,372,473	12,704,152
Total Financial Income	21,662,688	23,105,901	15,270,169
Financial Costs	(53,510,882)	(58,199,382)	(66,700,698)
Bank loans	(12,585)	(2,034,277)	(131,502)
Secured and unsecured obligations	(42,708,253)	(44,268,489)	(51,697,708)
Financial leasing	(811,172)	(780,953)	(1,039,013)
Valuation of financial derivatives	(1,067,820)	(824,922)	(1,725,211)
Financial provisions	(2,347,087)	(2,551,211)	(1,881,826)
Post-employment benefit obligations	(2,678,300)	(2,517,406)	(2,299,944)
Debt formalization expenses and other associated expenses	(836,174)
Capitalized borrowing costs	4,078,463	3,001,211	2,221,329
Other financial costs	(7,127,954)	(8,223,335)	(10,146,823)
Gains from indexed assets and liabilities	916,666	1,631,840	4,839,077
Foreign currency exchange differences	8,516,874	12,978,471	(51,277,332)
Total Financial Costs	(44,077,342)	(43,589,071)	(113,138,953)
Total Financial Results	$ (22,414,654)	$ (20,483,170)	$ (97,868,784)

Financial Results - Summary 195

Financial Results - Summary of Effects on Exchange Differences and Application of Indexed Assets and Liabilities (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	$ 916,666	$ 1,631,840	$ 4,839,077
Foreign currency exchange differences	8,516,874	12,978,471	(51,277,332)
Other financial assets [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	4,659,933	7,237,000	10,153,342
Foreign currency exchange differences	10,895,862	25,476,638	10,637,768
Other non-financial assets [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities			840,108
Trade and other receivables [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	155,158	1,077,086	745,270
Foreign currency exchange differences	390,764	2,595,997	10,313,151
Current tax assets and liabilities [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	1,654,538	2,349,415	6,052,524
Foreign currency exchange differences	(188,270)
Other financial liabilities (financial debt and derivative instruments) [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	(5,551,163)	(9,014,858)	(12,864,959)
Foreign currency exchange differences	(4,358,937)	(18,538,354)	(30,533,746)
Trade and other payables [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities	(1,800)	(16,803)	(73,133)
Foreign currency exchange differences	(1,152,505)	3,203,739	(46,715,886)
Other provisions [Member]
Disclosure Of Financial Results [Line Items]
Gains from indexed assets and liabilities			(14,075)
Cash and cash equivalents [Member]
Disclosure Of Financial Results [Line Items]
Foreign currency exchange differences	2,931,086	$ 240,451	$ 5,021,381
Other non-financial liabilities [Member]
Disclosure Of Financial Results [Line Items]
Foreign currency exchange differences	$ (1,126)

Information by Segment - Summar

Information by Segment - Summary of Assets and Liabilities by Segment (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Segment Assets And Liabilities [Line Items]
TOTAL CURRENT ASSETS	$ 1,059,341,785	$ 866,526,937
Cash and cash equivalents	419,456,026	245,999,192	$ 144,261,845	$ 133,015,629
Other current financial assets	20,627,062	584,244
Other current non-financial assets	6,002,142	15,831,486
Trade and other current receivables	419,752,286	445,071,856
Current accounts receivable from related parties	71,856,046	52,858,384
Inventories	39,686,942	37,539,596
Current tax assets	77,756,048	55,649,171
Non-current assets or disposal groups held for sale	4,205,233	12,993,008
TOTAL NON-CURRENT ASSETS	4,635,431,223	4,532,184,075
Other non-current financial assets	33,418,204	28,827,542
Other non-current non-financial assets	13,813,139	13,336,152
Trade and other non-current receivables	36,182,399	33,500,105
Investments accounted for using the equity method	12,707,221	18,738,198	45,716,371
Intangible assets other than goodwill	55,170,904	44,470,750	42,879,326
Goodwill	887,257,655	887,257,655	887,257,655
Property, plant and equipment	3,585,687,137	3,476,128,634
Investment property	8,356,772	8,128,522	8,150,987
Deferred tax assets	2,837,792	21,796,517
TOTAL ASSETS	5,694,773,008	5,398,711,012
TOTAL CURRENT LIABILITIES	816,816,646	757,246,647
Other current financial liabilities	18,815,448	25,696,166
Trade and other current payables	594,498,606	561,505,283
Current accounts payable to related parties	119,612,972	90,428,929
Other current provisions	5,636,171	6,493,532
Current tax liabilities	67,027,507	61,599,415
Other current non-financial liabilities	11,225,942	11,523,322
TOTAL NON-CURRENT LIABILITIES	1,090,994,705	1,178,470,723
Other non-current financial liabilities	781,978,145	854,016,751
Trade and other non-current payables	659,824	1,483,113
Non-current accounts payable to related parties	318,518	251,527
Other long-term provisions	78,422,837	63,106,908
Deferred tax liabilities	172,223,681	199,364,794
Non-current provisions for employee benefits	57,081,924	59,934,127
Other non-current non-financial liabilities	309,776	313,503
TOTAL EQUITY	3,786,961,657	3,462,993,642	3,201,900,783	3,084,065,791
Equity attributable to Enel Chile	2,983,384,010	2,763,391,288
Allocated capital	2,229,108,975	2,229,108,975
Retained earnings	1,751,605,583	1,569,375,291
Other reserves	(997,330,548)	(1,035,092,978)	(958,589,952)	$ (928,879,218)
Non-controlling interests	803,577,647	699,602,354	$ 609,219,281
TOTAL LIABILITIES AND EQUITY	5,694,773,008	5,398,711,012
Operating Segments [Member] | Generation [Member]
Disclosure Of Segment Assets And Liabilities [Line Items]
TOTAL CURRENT ASSETS	662,804,360	543,372,955
Cash and cash equivalents	211,027,141	114,486,479
Other current financial assets	20,523,276	487,106
Other current non-financial assets	2,167,272	4,409,288
Trade and other current receivables	218,178,007	260,440,086
Current accounts receivable from related parties	109,797,820	82,727,781
Inventories	31,740,903	33,390,799
Current tax assets	65,164,708	34,438,408
Non-current assets or disposal groups held for sale	4,205,233	12,993,008
TOTAL NON-CURRENT ASSETS	2,891,657,830	2,856,309,537
Other non-current financial assets	33,391,398	28,802,569
Other non-current non-financial assets	12,853,460	12,318,444
Trade and other non-current receivables	1,032,922	6,788,437
Investments accounted for using the equity method	12,707,221	18,738,198
Intangible assets other than goodwill	18,607,972	19,266,874
Goodwill	24,860,356	24,860,356
Property, plant and equipment	2,788,204,501	2,726,838,536
Deferred tax assets		18,696,123
TOTAL ASSETS	3,554,462,190	3,399,682,492
TOTAL CURRENT LIABILITIES	543,356,500	555,777,465
Other current financial liabilities	18,815,434	25,696,064
Trade and other current payables	329,448,226	341,088,664
Current accounts payable to related parties	122,862,944	121,018,039
Other current provisions	5,296,635	6,493,428
Current tax liabilities	66,933,261	61,457,940
Other current non-financial liabilities		23,330
TOTAL NON-CURRENT LIABILITIES	1,022,091,736	1,114,144,775
Other non-current financial liabilities	781,978,145	854,016,751
Trade and other non-current payables	632,642	1,453,022
Non-current accounts payable to related parties	318,518	251,527
Other long-term provisions	63,992,567	57,325,914
Deferred tax liabilities	160,293,916	185,277,004
Non-current provisions for employee benefits	14,875,948	15,820,557
TOTAL EQUITY	1,989,013,954	1,729,760,252
Equity attributable to Enel Chile	1,989,013,954	1,729,760,252
Allocated capital	552,777,321	552,777,321
Retained earnings	1,398,018,156	1,199,429,221
Share Premium	85,511,492
Other reserves	(47,293,015)	(22,446,290)
TOTAL LIABILITIES AND EQUITY	3,554,462,190	3,399,682,492
Operating Segments [Member] | Distribution [Member]
Disclosure Of Segment Assets And Liabilities [Line Items]
TOTAL CURRENT ASSETS	261,378,069	245,122,733
Cash and cash equivalents	42,594,390	23,378,615
Other current financial assets	61,887	47,517
Other current non-financial assets	3,434,462	11,091,061
Trade and other current receivables	197,011,114	180,290,279
Current accounts receivable from related parties	6,305,806	8,895,440
Inventories	3,049,576	1,878,072
Current tax assets	8,920,834	19,541,749
TOTAL NON-CURRENT ASSETS	893,633,579	829,203,115
Other non-current financial assets	26,806	24,973
Other non-current non-financial assets	959,679	1,019,050
Trade and other non-current receivables	34,272,234	24,978,209
Investments accounted for using the equity method		60,325
Intangible assets other than goodwill	34,236,891	25,430,420
Goodwill	2,240,478	2,240,478
Property, plant and equipment	821,234,672	774,999,730
Deferred tax assets	662,819	449,930
TOTAL ASSETS	1,155,011,648	1,074,325,848
TOTAL CURRENT LIABILITIES	408,687,871	259,684,837
Other current financial liabilities	14	102
Trade and other current payables	189,458,076	151,549,875
Current accounts payable to related parties	207,909,593	96,520,909
Other current provisions		104
Current tax liabilities	94,246	113,855
Other current non-financial liabilities	11,225,942	11,499,992
TOTAL NON-CURRENT LIABILITIES	61,965,918	106,283,505
Trade and other non-current payables	27,182	30,091
Non-current accounts payable to related parties		50,000,180
Other long-term provisions	14,430,270	5,780,994
Deferred tax liabilities	18,786,185	20,502,853
Non-current provisions for employee benefits	28,412,505	29,655,884
Other non-current non-financial liabilities	309,776	313,503
TOTAL EQUITY	684,357,859	708,357,506
Equity attributable to Enel Chile	684,357,859	708,357,506
Allocated capital	230,137,980	230,137,980
Retained earnings	769,928,443	794,856,204
Share Premium	354,220
Other reserves	(316,062,784)	(316,636,678)
TOTAL LIABILITIES AND EQUITY	1,155,011,648	1,074,325,848
Holdings, Eliminations and Others [Member]
Disclosure Of Segment Assets And Liabilities [Line Items]
TOTAL CURRENT ASSETS	135,159,356	78,031,249
Cash and cash equivalents	165,834,495	108,134,098
Other current financial assets	41,899	49,621
Other current non-financial assets	400,408	331,137
Trade and other current receivables	4,563,165	4,341,491
Current accounts receivable from related parties	(44,247,580)	(38,764,837)
Inventories	4,896,463	2,270,725
Current tax assets	3,670,506	1,669,014
TOTAL NON-CURRENT ASSETS	850,139,814	846,671,423
Other non-current non-financial assets		(1,342)
Trade and other non-current receivables	877,243	1,733,459
Investments accounted for using the equity method		(60,325)
Intangible assets other than goodwill	2,326,041	(226,544)
Goodwill	860,156,821	860,156,821
Property, plant and equipment	(23,752,036)	(25,709,632)
Investment property	8,356,772	8,128,522
Deferred tax assets	2,174,973	2,650,464
TOTAL ASSETS	985,299,170	924,702,672
TOTAL CURRENT LIABILITIES	(135,227,725)	(58,215,655)
Trade and other current payables	75,592,304	68,866,744
Current accounts payable to related parties	(211,159,565)	(127,110,019)
Other current provisions	339,536
Current tax liabilities		27,620
TOTAL NON-CURRENT LIABILITIES	6,937,051	(41,957,557)
Non-current accounts payable to related parties		(50,000,180)
Deferred tax liabilities	(6,856,420)	(6,415,063)
Non-current provisions for employee benefits	13,793,471	14,457,686
TOTAL EQUITY	1,113,589,844	1,024,875,884
Equity attributable to Enel Chile	1,113,589,844	1,024,875,884
Allocated capital	1,446,193,674	1,446,193,674
Retained earnings	(416,341,016)	(424,910,134)
Share Premium	(85,865,712)
Other reserves	169,602,898	3,592,344
TOTAL LIABILITIES AND EQUITY	$ 985,299,170	$ 924,702,672

Information by Segment - Sum197

Information by Segment - Summary of Comprehensive Income by Segment (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Segment Comprehensive Income [Line Items]
Revenues and other operating income	$ 2,529,346,878	$ 2,541,566,819	$ 2,399,029,140
Total Revenues	2,490,470,178	2,515,843,880	2,384,293,189
Other operating income	38,876,700	25,722,939	14,735,951
Total	(1,521,155,517)	(1,497,419,580)	(1,481,985,559)
Energy purchases	(902,434,871)	(891,746,884)	(860,203,181)
Fuel consumption	(280,739,362)	(295,148,838)	(327,502,996)
Transportation costs	(155,879,249)	(195,123,118)	(182,453,155)
Contribution Margin	1,008,191,361	1,044,147,239	917,043,581
Other work performed by the entity and capitalized	14,388,987	16,096,852	21,004,053
Employee benefits expense	(121,503,777)	(124,098,428)	(136,554,721)
Other expenses	(161,824,074)	(170,769,137)	(125,857,397)
Operating Income	578,630,574	567,789,206	525,488,757
Depreciation and amortization expense	(152,684,106)	(161,660,610)	(153,201,662)
Impairment loss recognized in the period’s profit or loss	(7,937,817)	(35,926,710)	3,054,903
FINANCIAL RESULT	(22,414,654)	(20,483,170)	(97,868,784)
Total Financial Income	21,662,688	23,105,901	15,270,169
Other financial income	4,729,078	17,372,473	12,704,152
Financial Costs	(53,510,882)	(58,199,382)	(66,700,698)
Gains from indexed assets and liabilities	916,666	1,631,840	4,839,077
Foreign currency exchange differences	8,516,874	12,978,471	(51,277,332)
Share of profit (loss) of associates and joint ventures accounted for using the equity method	(2,696,904)	7,878,200	8,905,045
Other gains (losses)	113,241,196	121,490,062	20,055,745
Income before taxes	666,760,212	676,674,298	456,580,763
Income tax expense, continuing operations	(143,342,301)	(111,403,182)	(109,612,599)
NET INCOME	523,417,911	565,271,116	346,968,164
Equity owners of Enel Chile	349,382,642	384,159,865	251,838,410
Non-controlling interests	174,035,269	181,111,251	95,129,754
Operating Segments [Member]
Disclosure Of Segment Comprehensive Income [Line Items]
Revenues and other operating income	2,529,346,878	2,541,566,819	2,399,029,140
Total Revenues	2,490,470,178	2,515,843,880	2,384,293,189
Energy sales	2,268,459,154	2,312,643,618	2,247,363,757
Other sales	107,362,797	73,607,458	32,057,524
Other services rendered	114,648,227	129,592,804	104,871,908
Other operating income	38,876,700	25,722,939	14,735,951
Total	(1,521,155,517)	(1,497,419,580)	(1,481,985,559)
Energy purchases	(902,434,871)	(891,746,884)	(860,203,181)
Fuel consumption	(280,739,362)	(295,148,838)	(327,502,995)
Transportation costs	(155,879,249)	(195,123,118)	(182,453,155)
Other miscellaneous supplies and services	(182,102,035)	(115,400,740)	(111,826,228)
Contribution Margin	1,008,191,361	1,044,147,239	917,043,581
Other work performed by the entity and capitalized	14,388,987	16,096,852	21,004,053
Employee benefits expense	(121,503,777)	(124,098,428)	(136,554,721)
Other expenses	(161,824,074)	(170,769,137)	(125,857,397)
Operating Income	739,252,497	765,376,526	675,635,516
Depreciation and amortization expense	(152,684,106)	(161,660,610)	(153,201,662)
Impairment loss recognized in the period’s profit or loss	(7,937,817)	(35,926,710)	3,054,903
OPERATING INCOME	578,630,574	567,789,206	525,488,757
FINANCIAL RESULT	(22,414,654)	(20,483,170)	(97,868,784)
Total Financial Income	21,662,688	23,105,901	15,270,169
Cash and cash equivalents	8,377,023	3,831,162	2,566,017
Other financial income	13,285,665	19,274,739	12,704,152
Financial Costs	(53,510,882)	(58,199,382)	(66,700,698)
Bank borrowings	(12,585)	(2,034,311)	(131,503)
Secured and unsecured obligations	(42,708,253)	(44,268,489)	(51,697,708)
Other	(10,790,044)	(11,896,582)	(14,871,487)
Gains from indexed assets and liabilities	916,666	1,631,840	4,839,077
Foreign currency exchange differences	8,516,874	12,978,471	(51,277,332)
Positive	19,757,068	49,221,666	30,434,102
Negative	(11,240,194)	(36,243,195)	(81,711,434)
Share of profit (loss) of associates and joint ventures accounted for using the equity method	(2,696,904)	7,878,200	8,905,045
Other gains (losses)	113,241,196	121,490,062	20,055,745
Gain (loss) from other investments	105,461,664	121,456,518	4,308,859
Gain (loss) from the sale of property, plant and equipment	7,779,532	33,544	15,746,886
Income before taxes	666,760,212	676,674,298	456,580,763
Income tax expense, continuing operations	(143,342,301)	(111,403,182)	(109,612,599)
Net income from continuing operations	523,417,911	565,271,116	346,968,164
NET INCOME	523,417,911	565,271,116	346,968,164
Equity owners of Enel Chile	349,382,642	384,159,865	251,838,410
Non-controlling interests	174,035,269	181,111,251	95,129,754
Operating Segments [Member] | Generation [Member]
Disclosure Of Segment Comprehensive Income [Line Items]
Revenues and other operating income	1,634,937,087	1,659,727,329	1,543,812,461
Total Revenues	1,599,032,140	1,639,959,816	1,539,991,519
Energy sales	1,457,671,722	1,516,688,442	1,474,818,366
Other sales	94,452,287	64,638,599	24,293,133
Other services rendered	46,908,131	58,632,775	40,880,020
Other operating income	35,904,947	19,767,513	3,820,942
Total	(903,978,006)	(895,060,114)	(880,891,222)
Energy purchases	(346,954,692)	(335,731,822)	(320,731,795)
Fuel consumption	(280,739,362)	(295,148,838)	(327,502,995)
Transportation costs	(152,869,838)	(192,502,995)	(179,691,471)
Other miscellaneous supplies and services	(123,414,114)	(71,676,459)	(52,964,961)
Contribution Margin	730,959,081	764,667,215	662,921,239
Other work performed by the entity and capitalized	7,226,484	9,758,304	15,250,811
Employee benefits expense	(54,222,470)	(60,350,072)	(70,969,357)
Other expenses	(102,821,020)	(119,303,215)	(90,327,960)
Operating Income	581,142,075	594,772,232	516,874,733
Depreciation and amortization expense	(117,337,553)	(132,600,381)	(124,835,559)
Impairment loss recognized in the period’s profit or loss	55,494	(30,785,531)	9,793,653
OPERATING INCOME	463,860,016	431,386,320	401,832,827
FINANCIAL RESULT	(36,610,248)	(35,678,632)	(114,252,182)
Total Financial Income	5,273,672	6,150,751	234,822
Cash and cash equivalents	3,077,708	2,150,797	152,518
Other financial income	2,195,964	3,999,954	82,304
Financial Costs	(50,851,829)	(55,701,778)	(64,206,719)
Bank borrowings	(261)	(2,033,835)	(129,350)
Secured and unsecured obligations	(42,708,253)	(44,268,489)	(51,697,708)
Other	(8,143,315)	(9,399,454)	(12,379,661)
Gains from indexed assets and liabilities	145,608	606,075	3,600,187
Foreign currency exchange differences	8,822,301	13,266,320	(53,880,472)
Positive	19,563,838	48,546,664	26,738,738
Negative	(10,741,537)	(35,280,344)	(80,619,210)
Share of profit (loss) of associates and joint ventures accounted for using the equity method	(2,696,904)	7,878,201	8,905,045
Other gains (losses)	113,088,869	121,490,974	4,015,401
Gain (loss) from other investments	105,462,769	121,457,430	4,309,205
Gain (loss) from the sale of property, plant and equipment	7,626,100	33,544	(293,804)
Income before taxes	537,641,733	525,076,863	300,501,091
Income tax expense, continuing operations	(112,099,519)	(83,216,935)	(76,655,819)
Net income from continuing operations	425,542,214	441,859,928	223,845,272
NET INCOME	425,542,214	441,859,928	223,845,272
Operating Segments [Member] | Distribution [Member]
Disclosure Of Segment Comprehensive Income [Line Items]
Revenues and other operating income	1,333,027,456	1,315,760,852	1,257,732,165
Total Revenues	1,328,791,205	1,310,175,226	1,247,900,614
Energy sales	1,186,795,410	1,172,700,558	1,112,912,836
Other sales	12,741,568	8,968,859	7,769,616
Other services rendered	129,254,227	128,505,809	127,218,162
Other operating income	4,236,251	5,585,626	9,831,551
Total	(1,062,076,646)	(1,042,329,385)	(983,732,902)
Energy purchases	(938,067,783)	(936,965,119)	(881,589,779)
Transportation costs	(63,009,956)	(60,454,433)	(60,901,746)
Other miscellaneous supplies and services	(60,998,907)	(44,909,833)	(41,241,377)
Contribution Margin	270,950,810	273,431,467	273,999,263
Other work performed by the entity and capitalized	6,630,130	6,338,547	5,753,242
Employee benefits expense	(38,449,551)	(35,557,457)	(32,454,962)
Other expenses	(61,942,592)	(52,077,948)	(62,182,651)
Operating Income	177,188,797	192,134,609	185,114,892
Depreciation and amortization expense	(36,685,324)	(30,399,304)	(29,082,449)
Impairment loss recognized in the period’s profit or loss	(7,993,311)	(5,141,179)	(6,738,750)
OPERATING INCOME	132,510,162	156,594,126	149,293,693
FINANCIAL RESULT	6,411,837	8,579,316	12,294,531
Total Financial Income	12,894,635	14,289,185	13,308,032
Cash and cash equivalents	1,975,564	1,680,365	634,961
Other financial income	10,919,071	12,608,820	12,673,071
Financial Costs	(7,094,366)	(6,488,659)	(1,801,829)
Bank borrowings	(12,299)	(476)	(1,659)
Other	(7,082,067)	(6,488,183)	(1,800,170)
Gains from indexed assets and liabilities	761,262	974,891	973,087
Foreign currency exchange differences	(149,694)	(196,101)	(184,759)
Positive	58,288	609,359	(235,571)
Negative	(207,982)	(805,460)	50,812
Share of profit (loss) of associates and joint ventures accounted for using the equity method		1,818	5,248
Other gains (losses)	157,458	(831)	14,660,351
Gain (loss) from other investments	4,026	(831)
Gain (loss) from the sale of property, plant and equipment	153,432		14,660,351
Income before taxes	139,079,457	165,174,429	176,253,823
Income tax expense, continuing operations	(34,030,322)	(32,589,362)	(36,956,051)
Net income from continuing operations	105,049,135	132,585,067	139,297,772
NET INCOME	105,049,135	132,585,067	139,297,772
Holdings, Eliminations and Others [Member]
Disclosure Of Segment Comprehensive Income [Line Items]
Revenues and other operating income	(438,617,665)	(433,921,362)	(402,515,486)
Total Revenues	(437,353,167)	(434,291,162)	(403,598,944)
Energy sales	(376,007,978)	(376,745,382)	(340,367,445)
Other sales	168,942		(5,225)
Other services rendered	(61,514,131)	(57,545,780)	(63,226,274)
Other operating income	(1,264,498)	369,800	1,083,458
Total	444,899,135	439,969,919	382,638,565
Energy purchases	382,587,604	380,950,057	342,118,393
Transportation costs	60,000,545	57,834,310	58,140,062
Other miscellaneous supplies and services	2,310,986	1,185,552	(17,619,890)
Contribution Margin	6,281,470	6,048,557	(19,876,921)
Other work performed by the entity and capitalized	532,373	1
Employee benefits expense	(28,831,756)	(28,190,899)	(33,130,402)
Other expenses	2,939,538	612,026	26,653,214
Operating Income	(19,078,375)	(21,530,315)	(26,354,109)
Depreciation and amortization expense	1,338,771	1,339,075	716,346
OPERATING INCOME	(17,739,604)	(20,191,240)	(25,637,763)
FINANCIAL RESULT	7,783,757	6,616,146	4,088,867
Total Financial Income	3,494,381	2,665,965	1,727,315
Cash and cash equivalents	3,323,751		1,778,538
Other financial income	170,630	2,665,965	(51,223)
Financial Costs	4,435,313	3,991,055	(692,150)
Bank borrowings	(25)		(494)
Other	4,435,338	3,991,055	(691,656)
Gains from indexed assets and liabilities	9,796	50,874	265,803
Foreign currency exchange differences	(155,733)	(91,748)	2,787,899
Positive	134,942	65,643	3,930,935
Negative	(290,675)	(157,391)	(1,143,036)
Share of profit (loss) of associates and joint ventures accounted for using the equity method		(1,819)	(5,248)
Other gains (losses)	(5,131)	(81)	1,379,993
Gain (loss) from other investments	(5,131)	(81)	(346)
Gain (loss) from the sale of property, plant and equipment			1,380,339
Income before taxes	(9,960,978)	(13,576,994)	(20,174,151)
Income tax expense, continuing operations	2,787,540	4,403,115	3,999,271
Net income from continuing operations	(7,173,438)	(9,173,879)	(16,174,880)
NET INCOME	$ (7,173,438)	$ (9,173,879)	$ (16,174,880)

Information by Segment - Sum198

Information by Segment - Summary of Cash Flow By Segment (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Segment Cash Flow [Line Items]
Cash flows from (used in) operating activities	$ 635,613,720	$ 614,684,856	$ 576,531,527
Cash flows from (used in) investing activities	(146,465,777)	(63,488,592)	(296,741,347)
Cash flows from (used in) financing activities	(317,595,521)	(445,866,972)	(273,442,450)
Operating Segments [Member] | Generation [Member]
Disclosure Of Segment Cash Flow [Line Items]
Cash flows from (used in) operating activities	488,157,362	490,177,558	428,211,622
Cash flows from (used in) investing activities	(91,867,647)	(34,631,759)	(255,251,615)
Cash flows from (used in) financing activities	(301,835,211)	(374,835,378)	(175,094,207)
Operating Segments [Member] | Distribution [Member]
Disclosure Of Segment Cash Flow [Line Items]
Cash flows from (used in) operating activities	170,628,958	148,354,968	194,756,025
Cash flows from (used in) investing activities	(74,464,531)	(55,007,620)	(82,947,418)
Cash flows from (used in) financing activities	(76,923,085)	(88,519,047)	(98,304,569)
Holdings, Eliminations and Others [Member]
Disclosure Of Segment Cash Flow [Line Items]
Cash flows from (used in) operating activities	(23,182,620)	(23,847,670)	(46,436,120)
Cash flows from (used in) investing activities	19,886,401	26,150,787	41,457,686
Cash flows from (used in) financing activities	$ 61,162,775	$ 17,487,453	$ (43,674)

Third Party Guarantees, Othe199

Third Party Guarantees, Other Contingent Assets And Liabilities, And Other Commitments - Additional Information (Detail) in Millions

Dec. 29, 2017CLP ($)MonthlyTaxUnitFine

Nov. 09, 2017UTM

Nov. 03, 2017UTM

Aug. 11, 2017CLP ($)MonthlyTaxUnit

Jul. 15, 2017CLP ($)

Jun. 16, 2017CLP ($)

Dec. 31, 2017CLP ($)UTM

Dec. 31, 2005lawsuit

Dec. 31, 2017USD ($)

Dec. 31, 2016CLP ($)

Dec. 31, 2016USD ($)

Mar. 31, 2016USD ($)

Mar. 31, 2016CLF ( )

Disclosure of other provisions [Line Items]

Debt obligations

$ 0

Debt obligations |

2.8

Cross default limit

$ 50,000,000

Percentage of debt repayment acceleration

50.00%

50.00%

Extraordinary credit granted per customer

$ 25,000

$ 25,000

Additional credit granted

$ 2,775,069,000

$ 590,796,000

Number of Monthly Tax Units imposed fines | MonthlyTaxUnit

110,000

70,000

Fine imposed amount

$ 5,166,920,000

$ 3,288,040,000

Number Of fines imposed | Fine

3

Enel Distribucion Chile S.A. [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

$ 600,000,000

Fine imposed by Superintendence of electricity and fuels | UTM

2,000

35,611

Enel Distribucion Chile S.A. [Member] | Ms. Camila Paz Castillo Abarca [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

200,000,000

Enel Distribucion Chile S.A. [Member] | Ms. Kimora Belen Fernandez Castillo [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

200,000,000

Enel Distribucion Chile S.A. [Member] | Ms. Graciela Rodriguez Mundaca [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

200,000,000

Enel Distribucion Chile S.A. [Member] | Mr. Victor Hugo Coronado Gonzalez [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

704,860,000

Chilectra S A [Member] | Ms. Evelyn del Carmen Molina Gonzalez [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

2,000,000,000

Litigation claims settlement amount

90,000,000

Ingenieria Electrica Azeta Ltda and Enel Distribucion Chile S.A. [Member] | Ms. Ximena Acevedo Herrera [Member]

Disclosure of other provisions [Line Items]

Litigation claim amount for damages

$ 878,227,000

Enel Generacion Chile [Member]

Disclosure of other provisions [Line Items]

Number of lawsuits filed | lawsuit

3

GasAtacama Chile S.A. [Member]

Disclosure of other provisions [Line Items]

Provision recognized on litigation, percentage

25.00%

Fine of illegality claim against the superintendence of electricity and fuels | UTM

120,000

Provision for percentage of fine imposed, litigation settlement

50.00%

Energy purchase commitments [Member]

Disclosure of other provisions [Line Items]

Future energy purchase commitments

$ 16,493,309,264,000

$ 18,694,023,941,000

Yankee Bonds [Member]

Disclosure of other provisions [Line Items]

Cross default limit

$ 30,000,000

Percentage of bondholders, demands debt acceleration

25.00%

Cross default threshold amount

50,000,000

Bonds outstanding

$ 438,757,209,000

Local Bonds [Member]

Disclosure of other provisions [Line Items]

Cross default limit

$ 50,000,000

Percentage of bondholders, demands debt acceleration

50.00%

Bonds outstanding

$ 324,822,376,000

Series H [Member]

Disclosure of other provisions [Line Items]

Description of debt to capitalization ratio

consolidated debt ratio, which is Financial Debt to Capitalization, must be no more than 0.64.

Financial debt to capitalization ratio, maximum

0.64%

Debt to capitalization ratio

0.28%

0.28%

Minimum equity requirement

$ 761,661,000,000

Equity

$ 1,961,517,727,000,000

Financial expense coverage ratio

11.55%

Net asset position

$ 83,390,000

Series H [Member] | Bottom of Range [Member]

Disclosure of other provisions [Line Items]

Financial expense coverage ratio

1.85%

Series H [Member] | Top of Range [Member]

Disclosure of other provisions [Line Items]

Net asset position

$ 100,000,000

Series M [Member]

Disclosure of other provisions [Line Items]

Description of debt to capitalization ratio

Consolidated Debt Ratio: The consolidated debt ratio, which is Financial debt to Capitalization, must be no more than 0.64.

Financial debt to capitalization ratio, maximum

0.64%

Debt to capitalization ratio

0.28%

0.28%

Description of debt to equity ratio

Debt Equity Ratio: The debt equity ratio, which is Financial debt to Net Equity, must be no more than 1.4.

Financial debt to net equity ratio, maximum

1.40%

Debt to equity ratio

0.39%

Debt/EBITDA ratio, description

The ratio between Financial Debt and EBITDA must be no more than 6.5.

Debt/EBITDA ratio, maximum

6.50%

Debt/EBITDA ratio

1.34%

Third Party Guarantees, Othe200

Third Party Guarantees, Other Contingent Assets and Liabilities, and Other Commitments - Summary of Indirect Guarantees (Detail) - Indirect Guarantees [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other provisions [Line Items]
Outstanding balance	$ 31,294	$ 33,449
Bonds Series B [Member] | Bondholders of Enel Americas' Bonds [Member]
Disclosure of other provisions [Line Items]
Description of type of other equity instruments granted	Secured
Maturity	October 2,028
Creditor Of Guarantee	Bondholders of Enel Américas' Bonds
Debtor, Company	Enel Américas S.A.
Relationship	Entities demerged from original debtor Enersis S.A. (codebtor Enel Chile S.A.)
Type of Guarantee	Codebtor
Outstanding balance	$ 31,294	$ 33,449

Personnel Figures - Summary of

Personnel Figures - Summary of Number of Employees (Detail) - Employee	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	1,948	2,010
Annual Average	1,993	2,015
Managers and Key Executives [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	63	62
Professionals and Technicians [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	1,770	1,733
Staff and Others [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	115	215
Chile [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	1,923	1,984	1,984
Annual Average	1,968	1,988
Chile [Member] | Managers and Key Executives [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	63	62
Chile [Member] | Professionals and Technicians [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	1,747	1,709
Chile [Member] | Staff and Others [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	113	213
Argentina [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	25	26
Annual Average	25	27
Argentina [Member] | Professionals and Technicians [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	23	24
Argentina [Member] | Staff and Others [Member]
Disclosure Of Average Number Of Employees [Line Items]
Number of employees	2	2

Sanctions - Additional Informat

Sanctions - Additional Information (Detail) $ in Thousands	May 23, 2016CLP ($)UTM	Dec. 31, 2017CLP ($)UTMRepositionClaimResolution	Dec. 31, 2017CLF ( )	Nov. 03, 2016CLF ( )
Superintendence of Electricity and Fuels [Member] | GasAtacama Chile S.A. [Member]
Disclosure Of Sanctions [Line Items]
Legal claim amount		$ 5,541,960		120,000
Legal claim amount paid		18,492	400
Tarapaca’s Health Secretary’s [Member] | GasAtacama Chile S.A. [Member]
Disclosure Of Sanctions [Line Items]
Legal claim amount		$ 23,347	500
Number of Fines | Reposition		4
Enel Generación Chile S.A. [Member] | Bio Bio Health Secretary [Member]
Disclosure Of Sanctions [Line Items]
Legal claim amount		$ 23,347	500
Enel Generación Chile S.A. [Member] | Antofagastas Health Secretary [Member]
Disclosure Of Sanctions [Line Items]
Legal claim amount		$ 9,339	200
Enel Distribucion Chile S.A. [Member]
Disclosure Of Sanctions [Line Items]
Number of claims filed by company against resolutions issued by superintendency of electricity and fuels | Claim		4
Number of resolutions issued by superintendency of electricity and fuels | Resolution		4
Fine of claim against the superintendency of electricity and fuels related to weather occurred | UTM		180,000
Amount of fine imposed by superintendency of electricity and fuels related to weather occurred | $		$ 8,454,960
Fine of illegality claim against the superintendency of electricity and fuels related to maintenance of facilities | UTM	2,000
Amount of fine illegality claim against the superintendency of electricity and fuels related to maintenance of facilities | $	$ 93,944

Environment - Summary of Enviro

Environment - Summary of Environmental Expenses (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Environmental Expenses [Line Items]
Total Disbursements	$ 18,709,151	$ 37,941,840	$ 7,387,913
Amounts Capitalized	10,939,921	35,695,948	3,448,552
Expenses	7,769,230	2,245,891	3,939,361
Disbursement amount in the future	2,068,381	5,068	1,205,829
Total Disbursements	$ 20,777,533	$ 37,946,908	$ 8,593,742
Pehuenche [Member] | Hydroelectric Central Environmental Expenditures [Member]
Environmental Expenses [Line Items]
Name	Hydroelectric Central Environmental Expenditures	Hydroelectric Central Environmental Expenditures	Hydroelectric Central Environmental Expenditures
Project	Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations.	Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS).	Studies, monitoring, laboratory analysis, removal and final disposal of solid waste at hydroelectric power stations (HPS), thermoelectric power stations and combine cycle power stations.
Project Status (Finished, In progress	In progress	In progress	In progress
Total Disbursements	$ 6,786	$ 6,515	$ 16,877
Expenses	6,786	6,515	16,877
Total Disbursements	$ 6,787	$ 6,515	$ 16,877
Pehuenche [Member] | Investments in Central Hydroelectric Plants [Member]
Environmental Expenses [Line Items]
Name			Investments in Central Hydroelectric Plants
Project			Regularization fuel facilities; Regularization water and sewer system; Regularization collection wells; Fabrication and installation cubits acid spill; Normalization fenced site archeology
Project Status (Finished, In progress			In process
Total Disbursements			$ 361,712
Amounts Capitalized			361,712
Total Disbursements			$ 361,712
Enel Distribucion Chile S.A. [Member] | Vegetation Control In Redesat [Member]
Environmental Expenses [Line Items]
Name	Vegetation Control In Redesat	Vegetation Control In Redesat	Vegetation Control In Redesat
Project	This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv.	It consists of the pruning of branches until reaching the safety conditions to which the foliage must be left with respect to the drivers.	This activity contemplates the maintenance of the band of easement of high voltage lines between 34,5 y 500kv.
Project Status (Finished, In progress	In progress	Finished	Finished
Total Disbursements	$ 306,419	$ 38,475	$ 79,956
Expenses	$ 306,419	38,475	79,956
Disbursement amount in the future			$ 982,347
Estimated future disbursement date	Dec. 31, 2017		Dec. 31, 2015
Total Disbursements	$ 306,419	$ 38,475	$ 1,062,303
Enel Distribucion Chile S.A. [Member] | Management Respel [Member]
Environmental Expenses [Line Items]
Name	Management Respel	Management RESPEL	Management Respel
Project	Dangerous waste management	Consider the costs for the removal and treatment of Hazardous Waste (final destination) generated in maintenance activities AT Networks.	Dangerous waste management
Project Status (Finished, In progress	Finished	Finished	Finished
Total Disbursements	$ 265	$ 1,955	$ 3,377
Expenses	$ 265	1,955	3,377
Estimated future disbursement date	Sep. 30, 2017
Total Disbursements	$ 265	$ 1,955	$ 3,377
Enel Distribucion Chile S.A. [Member] | Environmental management in Ssee [Member]
Environmental Expenses [Line Items]
Name	Environmental management in Ssee	Environmental management in SSEE	Environmental management in Ssee
Project	Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter.	The service consists of the weeding and control of weeds in electric power substation enclosures in order to keep the enclosures free of weeds, ensuring a good operation of these facilities.	Tree maintenance of SSEE and removal of brush, debris and garbage, outer perimeter.
Project Status (Finished, In progress	In progress	Finished	Finished
Total Disbursements	$ 239,285	$ 50,686	$ 112,437
Expenses	239,285	50,686	112,437
Disbursement amount in the future	18,644
Total Disbursements	$ 257,929	$ 50,686	$ 112,437
Enel Distribucion Chile S.A. [Member] | Environmental management in Ssee One [Member]
Environmental Expenses [Line Items]
Project	Consider all the environmental work that is done inside and outside of SSEE, as fumigation, placement and/or repair of rodent baits, irrigation system repair, waste removal, environmental inspections, garden
Project Status (Finished, In progress	Finished
Total Disbursements	$ 46,771
Expenses	$ 46,771
Estimated future disbursement date	Dec. 31, 2017
Total Disbursements	$ 46,771
Enel Distribucion Chile S.A. [Member] | Improvements in the Network M T/Bt [Member]
Environmental Expenses [Line Items]
Name	Improvements in the Network M T/Bt	Improvements in the Network M T/BT	Improvements in the Network M T/Bt
Project	Traditional network replacement by protected, concentric, other	Space CAB and Pre-assembled.	Traditional network replacement by protected, concentric, other
Project Status (Finished, In progress	Finished	Finished	Finished
Total Disbursements	$ 3,066,846	$ 289,710	$ 1,841,766
Amounts Capitalized	3,066,846	289,710	1,841,766
Disbursement amount in the future	$ 1,957,246
Estimated future disbursement date	Sep. 30, 2017
Total Disbursements	$ 5,024,092	$ 289,710	$ 1,841,766
Enel Distribucion Chile S.A. [Member] | Environmental Permits [Member]
Environmental Expenses [Line Items]
Name	Environmental Permits	Environmental permits
Project	Baseline for Environmental Impact Study, execution RCA and normative, preparation of reports and sectoral permits.	DGA Studies project "Powering Line 110 kv, Ochagavia-Florida, Section TAP Santa Elena-TAP Macul" and DIA Ochagavia-Florida Section Tap Santa, Tap Macul.
Project Status (Finished, In progress	In progress	Finished
Total Disbursements	$ 68,001	$ 6,150
Amounts Capitalized	68,001	6,150
Disbursement amount in the future	$ 34,811
Estimated future disbursement date	Mar. 31, 2018
Total Disbursements	$ 102,812	$ 6,150
Enel Distribucion Chile S.A. [Member] | Vegetation Control in Networks Mt/Bt [Member]
Environmental Expenses [Line Items]
Name	Vegetation Control in Networks Mt/Bt		Vegetation Control in Networks Mt/Bt
Project	Pruning of trees near the media network and low voltage.		Pruning of trees near the media network and low voltage.
Project Status (Finished, In progress	In progress		Finished
Total Disbursements	$ 3,313,454		$ 930,940
Expenses	$ 3,313,454		930,940
Estimated future disbursement date	Dec. 31, 2017
Total Disbursements	$ 3,313,454		$ 930,940
Enel Distribucion Chile S.A. [Member] | Noise Control [Member]
Environmental Expenses [Line Items]
Name	Noise Control	Noise Control	Noise Control
Project	Noise measurement and electromagnetic fields in substation, lines and other facilities.	Measurement of noise in Sta Raquel, La Reina, Cisterna and Sta. Maria substations.	Noise measurement and electromagnetic fields in substation, lines and other facilities.
Project Status (Finished, In progress	In progress	In progress	Finished
Total Disbursements	$ 786	$ 12,920	$ 5,710
Amounts Capitalized		12,920
Expenses	$ 786		5,710
Disbursement amount in the future			$ 223,482
Estimated future disbursement date	Dec. 31, 2017		Dec. 31, 2015
Total Disbursements	$ 786	$ 12,920	$ 229,192
Enel Distribucion Chile S.A. [Member] | Asbestos Removal from Underground Cables [Member]
Environmental Expenses [Line Items]
Name	Asbestos Removal from Underground Cables
Project	Removal of fireproof tape with asbestos from the underground network MT.
Project Status (Finished, In progress	In progress
Total Disbursements	$ 166,434
Amounts Capitalized	166,434
Disbursement amount in the future	$ 37,290
Estimated future disbursement date	Dec. 31, 2017
Total Disbursements	$ 203,724
Enel Distribucion Chile S.A. [Member] | Arborizations of Substations and Sat Line [Member]
Environmental Expenses [Line Items]
Name	Arborizations of Substations and Sat Line
Project	Forest management plans, reforestations, construction and maintenance of tree-lined belts in substation.
Project Status (Finished, In progress	In progress
Total Disbursements	$ 251,740
Amounts Capitalized	251,740
Disbursement amount in the future	$ 20,390
Estimated future disbursement date	Dec. 31, 2017
Total Disbursements	$ 272,130
Enel Distribucion Chile S.A. [Member] | Management RESSOL [Member]
Environmental Expenses [Line Items]
Name		Management RESSOL
Project		This activity contemplates the clearing and pruning of the MT / BT distribution networks close to the distribution networks.
Project Status (Finished, In progress		Finished
Total Disbursements		$ 761,090
Expenses		761,090
Total Disbursements		$ 761,090
Enel Distribucion Chile S.A. [Member] | Environmental Permits [Member]
Environmental Expenses [Line Items]
Name		Environmental permits
Project		Payments will correspond to environmental commitments in the RCA that environmentally authorizes the project: Noise measurements and sectoral permits for the storage of waste
Project Status (Finished, In progress		Finished
Total Disbursements		$ 44,259
Amounts Capitalized		44,259
Total Disbursements		$ 44,259
Enel Distribucion Chile S.A. [Member] | Environmental Permits [Member]
Environmental Expenses [Line Items]
Name		Environmental permits
Project		Project day Potentiation Line 110 kv Los Almendros, El Salto, Tap Los Dominicos section.
Project Status (Finished, In progress		In progress
Total Disbursements		$ 8,856
Amounts Capitalized		8,856
Disbursement amount in the future		$ 5,068
Estimated future disbursement date		Jun. 30, 2017
Total Disbursements		$ 13,924
Enel Distribucion Chile S.A. [Member] | Improvements in the Network M T/BT [Member]
Environmental Expenses [Line Items]
Name		Improvements in the Network M T/BT
Project		The service consists in the maintenance of green areas with replacement of species and turf in substation enclosures of Chilectra.
Project Status (Finished, In progress		Finished
Total Disbursements		$ 49,907
Expenses		49,907
Total Disbursements		$ 49,907
Enel Distribucion Chile S.A. [Member] | Noise Control [Member]
Environmental Expenses [Line Items]
Name		Noise Control
Project		This activity contemplates the maintenance of the easement strip of a high voltage line between 34.5 and 500 kv.
Project Status (Finished, In progress		Finished
Total Disbursements		$ 513
Expenses		513
Total Disbursements		$ 513
Enel Distribucion Chile S.A. [Member] | Environmental Consulting [Member]
Environmental Expenses [Line Items]
Name		Environmental Consulting
Project		Environmental Consulting and Calibration of Sonometer.
Project Status (Finished, In progress		Finished
Total Disbursements		$ 1,492
Expenses		1,492
Total Disbursements		$ 1,492
Enel Distribucion Chile S.A. [Member] | Environmental permits Lo Espejo- Ochagavia Line [Member]
Environmental Expenses [Line Items]
Name		Environmental permits Lo Espejo- Ochagavia Line
Project		Sectoral Environmental Permit Processing, Lo Espejo-Ochagavia Line, Tap Cisterna section
Project Status (Finished, In progress		Finished
Total Disbursements		$ 989
Amounts Capitalized		989
Total Disbursements		$ 989
Enel Generación Chile S.A. [Member] | Environmental costs in combined cycle plants [Member]
Environmental Expenses [Line Items]
Name	Environmental costs in combined cycle plants	Environmental costs in combined cycle plants
Project	The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS.	The main expenses incurred are: Bocamina U1-2: Operation and maintenance, monitoring stations air quality and meteorology, Environmental audit monitoring network 1 per year. Annual Validation CEMS, Protocol Service Biomasa Environmental Materials (magazine, books) Isokinetic Measurements. Jobs SGI (Objetive NC, inspections, audits and fizcalization) ISO 14001, certification OHSAS, Operation and Maintenance Service CEMS.
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 1,252,355	$ 567,616
Expenses	1,252,355	567,616
Total Disbursements	$ 1,252,355	$ 567,616
Enel Generación Chile S.A. [Member] | Environmental costs in hydroelectric plants [Member]
Environmental Expenses [Line Items]
Name	Environmental costs in hydroelectric plants	Environmental costs in hydroelectric plants
Project	Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in hydroelectric power plants (C.H.)	Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in hydroelectric power plants (HPS)
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 251,277	$ 181,644
Expenses	251,277	181,644
Total Disbursements	$ 251,277	$ 181,644
Enel Generación Chile S.A. [Member] | Ralco Hydroelectric Plant [Member]
Environmental Expenses [Line Items]
Name	Ralco Hydroelectric Plant	Ralco Hydroelectric Plant
Project	Reforestation according to the agreement with the Catholic University and Electrification of housing in Ayin Maipu.	Plan Ralco: Reforestation according to the Agreement with the Catholic University and Electrification of housing in Ayin Maipu.
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 5,075,137	$ 4,497,330
Amounts Capitalized	5,075,137	4,497,330
Total Disbursements	$ 5,075,137	$ 4,497,330
Enel Generación Chile S.A. [Member] | Tal Tal Thermal Plant [Member]
Environmental Expenses [Line Items]
Name	Tal Tal Thermal Plant	Tal Tal Thermal Plant
Project	Dejection Nox TalTal: Engineering Civil Works and permits	Dejection Nox TalTal: Engineering Civil Works and permits
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 1,290,133	$ 3,173,813
Amounts Capitalized	1,290,133	3,173,813
Total Disbursements	$ 1,290,133	$ 3,173,813
Enel Generación Chile S.A. [Member] | El Toro Hydroelectric Plant [Member]
Environmental Expenses [Line Items]
Name	El Toro Hydroelectric Plant
Project	Withdrawal Domestic and Industrial Waste
Project Status (Finished, In progress	In progress
Enel Generación Chile S.A. [Member] | Environmental costs in thermal plants [Member]
Environmental Expenses [Line Items]
Name	Environmental costs in thermal plants	Environmental costs in thermal plants
Project	Studies, monitoring, laboratory analysis, retirement and final disposal of solid waste in thermoelectric plants (C.T.)	Studies, monitoring, laboratory analysis, removal and final disposal of solid waste in thermoelectric plants (Thermal Power Plants)
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 870,281	$ 243,264
Expenses	870,281	243,264
Total Disbursements	$ 870,281	$ 243,264
Enel Generación Chile S.A. [Member] | Central Environmental Costs [Member]
Environmental Expenses [Line Items]
Name			Central Environmental Costs
Project			Waste treatment, sanitation
Project Status (Finished, In progress			In progress
Total Disbursements			$ 2,455,575
Expenses			2,455,575
Total Disbursements			$ 2,455,575
Enel Generación Chile S.A. [Member] | CT Bocamina [Member]
Environmental Expenses [Line Items]
Name			CT Bocamina
Project			Emissions monitoring, CEMS project, NOX abatement
Project Status (Finished, In progress			In progress
Total Disbursements			$ 1,855
Amounts Capitalized			1,855
Total Disbursements			$ 1,855
Enel Generación Chile S.A. [Member] | Cems project [Member]
Environmental Expenses [Line Items]
Name			Cems project
Project			Cems C.T. Quintero project, C.T. San Isidro II project and C.T. Tal Tal project
Project Status (Finished, In progress			In progress
Total Disbursements			$ 61
Amounts Capitalized			61
Total Disbursements			$ 61
Enel Generación Chile S.A. [Member] | Regularizations C.H. [Member]
Environmental Expenses [Line Items]
Name			Regularizations C.H.
Project			Regularizations C.H.
Project Status (Finished, In progress			In progress
Total Disbursements			$ 155,485
Amounts Capitalized			155,485
Total Disbursements			$ 155,485
Enel Generación Chile S.A. [Member] | Regularizations C.H. Ralco [Member]
Environmental Expenses [Line Items]
Name			Regularizations C.H. Ralco
Project			Social Afforestation Program and Restorations Palmucho Chenqueco bypass road; Bridge reconstruction Lonquimay.
Project Status (Finished, In progress			In progress
Total Disbursements			$ 1,051,017
Amounts Capitalized			1,051,017
Total Disbursements			$ 1,051,017
GasAtacama Chile [Member] | Environmental monitoring [Member]
Environmental Expenses [Line Items]
Name	Environmental monitoring
Project	Environmental monitoring with SK Ecología operation and maintenance CEMS.
Project Status (Finished, In progress	In progress
Total Disbursements	$ 1,463,204
Expenses	1,463,204
Total Disbursements	$ 1,463,204
GasAtacama Chile [Member] | Standardization Cems [Member]
Environmental Expenses [Line Items]
Name	Standardization Cems
Project	Normalización bodegas, gestión ambiental.
Project Status (Finished, In progress	In progress
Total Disbursements	$ 1,021,630
Amounts Capitalized	1,021,630
Total Disbursements	$ 1,021,630
GasAtacama Chile [Member] | Studies, Monitoring and Disposal of Waste [Member]
Environmental Expenses [Line Items]
Name		Studies, monitoring and disposal of waste
Project		Higenization, waste treatment, pest management and control system.
Project Status (Finished, In progress		Finished
Total Disbursements		$ 78,221
Expenses		78,221
Total Disbursements		$ 78,221
GasAtacama Chile [Member] | Studies, Monitoring and Laboratory Analysis [Member]
Environmental Expenses [Line Items]
Name		Studies, monitoring and laboratory analysis
Project		Withdrawal and final disposal of solid waste in Thermal Power Plants
Project Status (Finished, In progress		In progress
Total Disbursements		$ 169,743
Expenses		169,743
Total Disbursements		$ 169,743
GasAtacama Chile [Member] | Plant ZLD (studies) [Member]
Environmental Expenses [Line Items]
Name		Plant ZLD (studies)
Project		Plant ZLD (studies)
Project Status (Finished, In progress		Finished
Total Disbursements		$ 13,470
Amounts Capitalized		13,470
Total Disbursements		$ 13,470
GasAtacama Chile [Member] | Coal Plants [Member]
Environmental Expenses [Line Items]
Name		Coal plants
Project		Emission standard (Desox y Denox Tarapacá)
Project Status (Finished, In progress		In progress
Total Disbursements		$ 27,648,451
Amounts Capitalized		27,648,451
Total Disbursements		$ 27,648,451
Eolica Canela [Member] | Environmental expenditures in power plants [Member]
Environmental Expenses [Line Items]
Name	Environmental expenditures in power plants	Environmental expenditures in power plants
Project	Water quality analysis and monitoring and Higenization Canela	Water quality analysis and monitoring and Higenization Canela
Project Status (Finished, In progress	In progress	In progress
Total Disbursements	$ 18,347	$ 94,770
Expenses	18,347	94,770
Total Disbursements	$ 18,347	$ 94,770
Eolica Canela [Member] | Central Environmental Expenses
Environmental Expenses [Line Items]
Name			Central Environmental expenses
Project			Water quality analysis and monitoring and Higenization Canela
Project Status (Finished, In progress			In progress
Total Disbursements			$ 11,376
Expenses			11,376
Total Disbursements			$ 11,376
Compania Electrica Tarapaca S.A. [Member] | Waste [Member]
Environmental Expenses [Line Items]
Name			Waste
Project			Studies, monitoring, laboratory analysis and waste disposal retirement
Project Status (Finished, In progress			Finished
Total Disbursements			$ 196,060
Expenses			196,060
Total Disbursements			$ 196,060
Compania Electrica Tarapaca S.A. [Member] | Waste treatment [Member]
Environmental Expenses [Line Items]
Name			Waste treatment
Project			Removal of non-hazardous household and industrial waste
Project Status (Finished, In progress			Finished
Total Disbursements			$ 127,053
Expenses			127,053
Total Disbursements			$ 127,053
Compania Electrica Tarapaca S.A. [Member] | Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions [Member]
Environmental Expenses [Line Items]
Name			Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions
Project			Abatement Nox (LNF burners + OFA), desulfurizer and monitoring CEMS emissions
Project Status (Finished, In progress			Finished
Total Disbursements			$ 9,624
Amounts Capitalized			9,624
Total Disbursements			$ 9,624
Compania Electrica Tarapaca S.A. [Member] | Afforestation (RCA) Water Eyes [Member]
Environmental Expenses [Line Items]
Name			Afforestation (RCA) Water Eyes
Project			Afforestation (RCA) Water Eyes
Project Status (Finished, In progress			Finished
Total Disbursements			$ 27,032
Amounts Capitalized			27,032
Total Disbursements			$ 27,032

Summarized Financial Informa204

Summarized Financial Information of Subsidiaries - Summary of Financial Information on Subsidiaries (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Total Current Assets	$ 1,059,341,785	$ 866,526,937
Total Non Current Assets	4,635,431,223	4,532,184,075
TOTAL ASSETS	5,694,773,008	5,398,711,012
Total Current Liabilities	816,816,646	757,246,647
Non-current Liabilities	1,090,994,705	1,178,470,723
Equity	3,786,961,657	3,462,993,642	$ 3,201,900,783	$ 3,084,065,791
TOTAL LIABILITIES AND EQUITY	5,694,773,008	5,398,711,012
Revenues	2,490,470,178	2,515,843,880	2,384,293,189
Raw materials and consumables used	(1,521,155,517)	(1,497,419,580)	(1,481,985,559)
Income before Taxes	666,760,212	676,674,298	456,580,763
Income tax expense, continuing operations	(143,342,301)	(111,403,182)	(109,612,599)
NET INCOME	523,417,911	565,271,116	346,968,164
Other Comprehensive Income	69,423,985	47,891,771	(95,460,269)
TOTAL COMPREHENSIVE INCOME	$ 592,841,896	$ 613,162,887	$ 251,507,895
Grupo Enel Distribucion Chile S A
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements	Consolidated	Consolidated
Total Current Assets	$ 261,378,069	$ 245,122,732
Total Non Current Assets	893,633,580	829,203,115
TOTAL ASSETS	1,155,011,649	1,074,325,847
Total Current Liabilities	408,687,866	259,684,836
Non-current Liabilities	61,965,918	106,283,505
Equity	684,357,865	708,357,506
TOTAL LIABILITIES AND EQUITY	1,155,011,649	1,074,325,847
Revenues	1,333,027,456	1,315,760,851
Raw materials and consumables used	(1,062,076,645)	(1,042,329,385)
Contribution Margin	270,950,811	273,431,466
Gross Operating Income	177,188,798	192,134,608
Operating Income	132,510,164	156,594,125
Financial Results	6,411,839	8,579,317
Income before Taxes	139,079,732	165,174,429
Income tax expense, continuing operations	(34,030,322)	(32,589,362)
NET INCOME	105,049,408	132,585,067
Other Comprehensive Income	1,515,176	(21,284,665)
TOTAL COMPREHENSIVE INCOME	$ 106,564,584	$ 111,300,402
Grupo Servicios Informaticos e Inmobiliarios Ltda. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements	Consolidated	Consolidated
Total Current Assets		$ 57,558,313
Total Non Current Assets		11,654,352
TOTAL ASSETS		69,212,665
Total Current Liabilities		6,711,190
Non-current Liabilities		1,466,867
Equity		61,034,608
TOTAL LIABILITIES AND EQUITY		69,212,665
Revenues		10,983,012
Contribution Margin		10,983,012
Gross Operating Income	$ (1)	(674,755)
Operating Income	(1)	(736,519)
Financial Results		2,565,301
Income before Taxes	(1)	1,828,782
Income tax expense, continuing operations		(107,413)
NET INCOME	(1)	1,721,370
TOTAL COMPREHENSIVE INCOME	$ (1)	$ 1,721,370
Empresa Electrica Pehuenche S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements	Separate	Separate
Total Current Assets	$ 35,369,243	$ 35,730,340
Total Non Current Assets	186,760,346	193,496,141
TOTAL ASSETS	222,129,589	229,226,481
Total Current Liabilities	38,310,560	43,012,321
Non-current Liabilities	48,261,590	50,044,060
Equity	135,557,439	136,170,100
TOTAL LIABILITIES AND EQUITY	222,129,589	229,226,481
Revenues	152,501,383	155,568,982
Raw materials and consumables used	(36,289,330)	(23,529,448)
Contribution Margin	116,212,053	132,039,534
Gross Operating Income	110,957,039	125,454,246
Operating Income	103,556,904	116,789,055
Financial Results	(395,231)	24,333
Income before Taxes	103,206,672	116,813,388
Income tax expense, continuing operations	(26,346,081)	(28,202,602)
NET INCOME	76,860,591	88,610,786
TOTAL COMPREHENSIVE INCOME	$ 76,860,591	$ 88,610,786
Grupo Enel Generacion Chile S A
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements	Consolidated	Consolidated
Total Current Assets	$ 662,804,359	$ 543,372,956
Total Non Current Assets	2,891,657,830	2,856,309,537
TOTAL ASSETS	3,554,462,189	3,399,682,493
Total Current Liabilities	543,356,500	555,777,465
Non-current Liabilities	1,022,091,737	1,114,144,776
Equity	1,989,013,952	1,729,760,252
TOTAL LIABILITIES AND EQUITY	3,554,462,189	3,399,682,493
Revenues	1,634,937,088	1,659,727,329
Raw materials and consumables used	(903,978,007)	(895,060,114)
Contribution Margin	730,959,081	764,667,215
Gross Operating Income	581,142,074	594,772,233
Operating Income	463,860,015	431,386,321
Financial Results	(36,610,248)	(35,678,633)
Income before Taxes	537,641,733	525,076,864
Income tax expense, continuing operations	(112,099,519)	(83,216,935)
NET INCOME	425,542,214	441,859,929
Other Comprehensive Income	67,663,516	(86,682,199)
TOTAL COMPREHENSIVE INCOME	$ 493,205,730	$ 355,177,730
Grupo Gas Atacama Chile S A [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements	Consolidated	Consolidated
Total Current Assets	$ 182,143,224	$ 194,264,349
Total Non Current Assets	611,319,090	663,665,991
TOTAL ASSETS	793,462,314	857,930,340
Total Current Liabilities	75,370,131	86,380,336
Non-current Liabilities	83,894,880	89,573,088
Equity	634,197,303	681,976,916
TOTAL LIABILITIES AND EQUITY	793,462,314	857,930,340
Revenues	307,272,380	173,489,754
Raw materials and consumables used	(170,752,796)	(87,098,923)
Contribution Margin	136,519,583	86,390,831
Gross Operating Income	106,213,750	67,795,883
Operating Income	70,509,184	45,426,269
Financial Results	1,432,674	6,453,677
Income before Taxes	80,142,531	53,666,618
Income tax expense, continuing operations	(25,417,139)	(10,337,536)
NET INCOME	54,725,392	43,329,082
Other Comprehensive Income	(3,338,115)	(1,779,413)
TOTAL COMPREHENSIVE INCOME	$ 51,387,277	$ 41,549,669
Companla Electrica Tarapaca S A
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Type of Financial Statements		Separate
Revenues		$ 219,980,554
Raw materials and consumables used		(139,960,874)
Contribution Margin		80,019,680
Gross Operating Income		62,455,761
Operating Income		36,937,980
Financial Results		(2,519,836)
Income before Taxes		51,585,349
Income tax expense, continuing operations		10,396,319
NET INCOME		61,981,668
Other Comprehensive Income		(924,812)
TOTAL COMPREHENSIVE INCOME		$ 61,056,856

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Thousands, $ in Thousands	Mar. 28, 2018USD ($)	Mar. 27, 2018CLP ($)	Mar. 25, 2018shares	Feb. 08, 2018CLP ($)shares	Jan. 22, 2018shares	Dec. 20, 2017shares
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Number of shares issued						23,069,844,862
Major Ordinary Share Transactions [Member]
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Number of shares outstanding					1,024,251,979,000
Percent of common shares held					2.09%
Shareholding concentration limit established by laws					65.00%
Number of shares issued				10,000,000,000,000
Increasing share capital amount | $				$ 820,000,000,000
Major Ordinary Share Transactions [Member] | Enel Generacion Chile [Member]
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Proportion of ownership interest in subsidiary				40.02%
Major Ordinary Share Transactions [Member] | Top of Range [Member]
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Percent of common shares held					5.00%
Announcing or Commencing Implementation of Major Restructuring [Member | Enel Generacion Chile [Member]
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Number of shares acquired			2,753,096,167
Percentage of acquired shares equivalent to subscribed and paid shares			33.60%
Total number of issued shares acquired			7,672,584,961
Percentage of total acquired shares equivalent to subscribed and paid shares			93.55%
Renewable Assets Reorganization [Member] | Enel Chile SA [Member] | Senior Unsecured Term Loan Credit Agreement [Member]
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]
Loan disbursements	$ 697,500,000	$ 517,680,625,000

Appendix I Enel Chile Group Sub

Appendix I Enel Chile Group Subsidiaries - Schedule of Percentage of Control in Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Central Eolica Canela S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	76.003.204-2
Company	Central Eólica Canela S.A.
Currency	Chilean peso
Indirect		75.00%
Total		75.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Promotion and development of renewable energy projects
Enel Distribucion Chile S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	96.800.570-7
Company	Enel Distribución Chile S.A.
Currency	Chilean peso
Direct	99.09%	99.08%
Indirect		0.01%
Total	99.09%	99.09%
Type of Relationship	Subsidiary
Country	Chile
Activity	Ownership interest in companies of any nature
Empresa Electrica de Colina Ltda. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	96.783.910-8
Company	Empresa Eléctrica de Colina Ltda.
Currency	Chilean peso
Indirect	100.00%	100.00%
Total	100.00%	100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Complete energy cycle and related supplies
Empresa Electrica Pehuenche S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	96.504.980-0
Company	Empresa Eléctrica Pehuenche S.A.
Currency	Chilean peso
Indirect	92.65%	92.65%
Total	92.65%	92.65%
Type of Relationship	Subsidiary
Country	Chile
Activity	Complete electric energy cycle
Enel Generación Chile S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	91.081.000-6
Company	Enel Generación Chile S.A.
Currency	Chilean peso
Direct	59.98%	59.98%
Total	59.98%	59.98%
Type of Relationship	Subsidiary
Country	Chile
Activity	Complete electric energy cycle
GasAtacama S.A. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	78.932.860-9
Company	GasAtacama Chile S.A.
Currency	Chilean peso
Direct	2.63%	2.63%
Indirect	97.37%	97.37%
Total	100.00%	100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Company management
Gasoducto Atacama Argentina S A [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	78.952.420-3
Company	Gasoducto Atacama Argentina S.A.
Currency	Chilean peso
Indirect	100.00%	100.00%
Total	100.00%	100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Natural gas exploitation and transportation
Servicios Informaticos e Inmobiliarios Ltda. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	76.107.186-6
Company	Servicios Informáticos e Inmobiliarios Ltda.
Currency	Chilean peso
Direct		99.00%
Indirect		1.00%
Total		100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Information Technology services
Luz Andes Ltda. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	96.800.460-3
Company	Luz Andes Ltda.
Currency	Chilean peso
Indirect	100.00%	100.00%
Total	100.00%	100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Energy and fuel transportation, distribution and sales
Empresa de Transmision Chena S.A [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	76.722.488-5
Company	Empresa de Transmisión Chena S.A
Currency	Chilean peso
Indirect	100.00%
Total	100.00%
Type of Relationship	Subsidiary
Country	Chile
Activity	Energy distribution
Sociedad Agricola de Cameros Ltda. [Member]
Disclosure Of Significant Investments In Subsidiaries [Line Items]
Taxpayer ID No.	77.047.280-6
Company	Sociedad Agrícola de Cameros Ltda.
Currency	Chilean peso
Direct	57.50%
Indirect		57.50%
Total	57.50%	57.50%
Type of Relationship	Subsidiary
Country	Chile
Activity	Financial investments

Appendix 2 Changes in the Sc207

Appendix 2 Changes in the Scope of Consolidation - Summary of Companies Incorporated Into Scope of Consolidation (Detail) - Empresa de Transmision Chena S.A [Member]	12 Months Ended
	Dec. 31, 2017
Disclosure Of Subsidiaries Incorporated Into Consolidation [Line Items]
Percentage of indirect control	100.00%
Total	100.00%

Appendix 2 Changes in the Sc208

Appendix 2 Changes in the Scope of Consolidation - Summary of Companies Eliminated From the Scope of Consolidation (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
GNL Quintero S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		20.00%
Percentage of total ownership interest		20.00%
Consolidation Method	Equity method	Equity method
Gasoducto TalTal S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		100.00%
Percentage of total ownership interest		100.00%
Consolidation Method	Full integration	Full integration
GNL Norte S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		100.00%
Percentage of total ownership interest		100.00%
Consolidation Method	Full integration	Full integration
Progas S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		100.00%
Percentage of total ownership interest		100.00%
Consolidation Method	Full integration	Full integration
Compania Electrica Tarapaca S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of direct ownership		3.78%
Percentage of indirect ownership		96.21%
Percentage of total ownership interest		99.99%
Consolidation Method	Full integration	Full integration
Inversiones GasAtacama Holding Ltda. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		100.00%
Percentage of total ownership interest		100.00%
Consolidation Method	Full integration	Full integration
GasAtacama S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership		100.00%
Percentage of total ownership interest		100.00%
Consolidation Method	Full integration	Full integration
Electrogas [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership	42.50%
Percentage of total ownership interest	42.50%
Consolidation Method	Equity method	Equity method
Servicios Informaticos e Inmobiliarios Ltda. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of direct ownership	99.90%
Percentage of indirect ownership	0.10%
Percentage of total ownership interest	100.00%
Consolidation Method	Full integration	Full integration
Central Eolica Canela S.A. [Member]
Disclosure Of Subsidiaries Excluded From Consolidation [Line Items]
Percentage of indirect ownership	75.00%
Percentage of total ownership interest	75.00%
Consolidation Method	Full integration	Full integration

Appendix 3 Associates and Jo209

Appendix 3 Associates and Joint Ventures - Summary of Investments Accounted for Using the Equity Method (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Electrogas S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Portfolio company
Taxpayer ID No.	96.806.130-5	96.806.130-5
Company	Electrogas S.A.	Electrogas S.A.
Currency	U.S. dollar	U.S. dollar
Indirect		42.50%
Total		42.50%
Type of Relationship	Associate
Country	Chile
GNL Chile S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Promotion of liquefied natural gas supply project
Taxpayer ID No.	76.418.940-K	76.418.940-K
Company	GNL Chile S.A.	GNL Chile S.A.
Currency	U.S. dollar	U.S. dollar
Indirect	33.33%	33.33%
Total	33.33%	33.33%
Type of Relationship	Associate
Country	Chile
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.652.400-1	76.652.400-1
Company	Centrales Hidroeléctricas De Aysén S.A.	Centrales Hidroeléctricas De Aysén S.A.
Currency	Chilean peso	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Aysen Transmision S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.041.891-9
Company	Aysén Transmisión S.A.
Currency	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Aysen Energia S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.091.595-5
Company	Aysén Energía S.A.
Currency	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Electric energy transportation and distribution
Taxpayer ID No.	77.017.930-0	77.017.930-0
Company	Transmisora Eléctrica de Quillota Ltda.	Transmisora Eléctrica de Quillota Ltda.
Currency	Chilean peso	Chilean peso
Indirect	50.00%	50.00%
Total	50.00%	50.00%
Type of Relationship	Joint venture
Country	Chile

Appendix 4 Additional Inform210

Appendix 4 Additional Information on Financial Debt - Summary of Bank Borrowings by Currency and Maturity (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	122	4,283
Undiscounted Cash Flow [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	4,283
Undiscounted Cash Flow [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.00%
Current, Maturity	$ 122	4,283
Undiscounted Cash Flow [Member] | Chile [Member] | Chilean Peso [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,283

Appendix 4 Additional Inform211

Appendix 4 Additional Information on Financial Debt - Summary of Identification of Bank Borrowings by Company (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.99%	6.99%
Nominal Interest Rate	6.90%	6.90%
Enel Distribucion Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number (RUT)	96.800.570-7
Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number (RUT)	91.081.000-6
Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,274
Banco De Credito E Inversiones [Member] | Enel Distribucion Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 13	$ 102
Banco De Credito E Inversiones [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 97	$ 2,037
Banco De Credito E Inversiones [Member] | Less than 90 Days [Member] | Enel Distribucion Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	13	102
Banco De Credito E Inversiones [Member] | Less than 90 Days [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 97	$ 2,037
Banco Santander [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 12	$ 2,135
Banco Santander [Member] | Less than 90 Days [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	12	2,135
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	4,283
Undiscounted Cash Flow [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.00%
Current, Maturity	$ 122	$ 4,283
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Effective Interest Rate	6.90%	6.90%
Undiscounted Cash Flow [Member] | Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 122	$ 4,283
Undiscounted Cash Flow [Member] | Banco De Credito E Inversiones [Member] | Enel Distribucion Chile S.A. [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number (RUT)	96.800.570-7	96.800.570-7
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 13	$ 102
Undiscounted Cash Flow [Member] | Banco De Credito E Inversiones [Member] | Enel Generación Chile S.A. [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number (RUT)	91.081.000-6	91.081.000-6
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 97	$ 2,048
Undiscounted Cash Flow [Member] | Banco De Credito E Inversiones [Member] | Less than 90 Days [Member] | Enel Distribucion Chile S.A. [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	13	102
Undiscounted Cash Flow [Member] | Banco De Credito E Inversiones [Member] | Less than 90 Days [Member] | Enel Generación Chile S.A. [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 97	$ 2,048
Undiscounted Cash Flow [Member] | Banco Santander [Member] | Enel Generación Chile S.A. [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number (RUT)	91.081.000-6	91.081.000-6
Effective Interest Rate	6.00%	6.00%
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 12	$ 2,133
Undiscounted Cash Flow [Member] | Banco Santander [Member] | Less than 90 Days [Member] | Enel Generación Chile S.A. [Member] | Chile [Member] | Chilean Peso [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 12	$ 2,133

Appendix 4 Additional Inform212

Appendix 4 Additional Information on Financial Debt - Summary of Secured and Unsecured Liabilities by Currency and Maturity (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 15,455,782	$ 16,168,473
Non-current, Maturity	748,123,803	786,137,688
One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,322,081	6,884,819
Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	9,133,701	9,283,654
One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 725,827,751	$ 764,216,168
Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.99%	6.99%
Current, Maturity	$ 8,528,350	$ 9,287,472
Non-current, Maturity	430,228,859	468,578,474
Chile [Member] | U.S. Dollar [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,322,081	6,884,819
Chile [Member] | U.S. Dollar [Member] | Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	2,206,269	2,402,653
Chile [Member] | U.S. Dollar [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 430,228,859	$ 468,578,474
Chile [Member] | Unidades de Fomento [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.00%	6.00%
Current, Maturity	$ 6,927,432	$ 6,881,001
Non-current, Maturity	317,894,944	317,559,214
Chile [Member] | Unidades de Fomento [Member] | Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,927,432	6,881,001
Chile [Member] | Unidades de Fomento [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Chile [Member] | Unidades de Fomento [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Chile [Member] | Unidades de Fomento [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Chile [Member] | Unidades de Fomento [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Chile [Member] | Unidades de Fomento [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	295,598,892	295,637,694
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	55,256,390	60,190,505
Non-current, Maturity	1,127,959,493	1,247,557,135
Undiscounted Cash Flow [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	12,473,017	13,730,946
Undiscounted Cash Flow [Member] | Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	42,783,373	46,459,559
Undiscounted Cash Flow [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	78,718,927	59,691,577
Undiscounted Cash Flow [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	76,629,479	82,670,989
Undiscounted Cash Flow [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	74,540,030	80,375,483
Undiscounted Cash Flow [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	72,450,582	78,079,976
Undiscounted Cash Flow [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 825,620,475	$ 946,739,110
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.90%	6.90%
Current, Maturity	$ 26,791,914	$ 29,059,145
Non-current, Maturity	675,895,565	757,584,966
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	6,697,979	7,264,786
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	20,093,935	21,794,359
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	26,791,913	29,059,146
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	26,791,913	29,059,146
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	26,791,913	29,059,146
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	26,791,913	29,059,146
Undiscounted Cash Flow [Member] | Chile [Member] | U.S. Dollar [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 568,727,913	$ 641,348,382
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	5.48%	5.48%
Current, Maturity	$ 28,464,476	$ 31,131,360
Non-current, Maturity	452,063,928	489,972,169
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | One to Three Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	5,775,038	6,466,160
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | Three to Twelve Months [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	22,689,438	24,665,200
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	51,927,014	30,632,431
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	49,837,566	53,611,843
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	47,748,117	51,316,337
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	45,658,669	49,020,830
Undiscounted Cash Flow [Member] | Chile [Member] | Unidades de Fomento [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 256,892,562	$ 305,390,728

Appendix 4 Additional Inform213

Appendix 4 Additional Information on Financial Debt - Secured and Unsecured Liabilities by Company (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	$ 15,455,782	$ 16,168,473
Non-current, Maturity	748,123,803	786,137,688
One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	5,574,013	5,480,380
More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	725,827,751	764,216,168
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	55,256,390	60,190,505
Non-current, Maturity	$ 1,127,959,493	$ 1,247,557,135
Undiscounted Cash Flow [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	7.96%	7.96%
Nominal Interest Rate	7.88%	7.88%
Current, Maturity	$ 10,449,623	$ 11,330,589
Non-current, Maturity	$ 211,907,420	$ 241,549,747
Undiscounted Cash Flow [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	7.40%	7.40%
Nominal Interest Rate	7.33%	7.33%
Current, Maturity	$ 3,334,972	$ 3,612,937
Non-current, Maturity	$ 99,651,895	$ 108,152,964
Undiscounted Cash Flow [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	8.26%	8.26%
Nominal Interest Rate	8.13%	8.13%
Current, Maturity	$ 2,120,644	$ 2,299,059
Non-current, Maturity	$ 60,367,209	$ 65,538,042
Undiscounted Cash Flow [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	4.32%	4.32%
Nominal Interest Rate	4.25%	4.25%
Current, Maturity	$ 10,886,675	$ 11,816,560
Non-current, Maturity	$ 303,969,041	$ 342,344,213
Undiscounted Cash Flow [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	7.17%	7.17%
Nominal Interest Rate	6.20%	6.20%
Current, Maturity	$ 11,020,396	$ 11,369,004
Non-current, Maturity	$ 83,771,677	$ 93,373,927
Undiscounted Cash Flow [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Taxpayer ID Number	91.081.000-6	91.081.000-6
Effective Interest Rate	4.82%	4.82%
Nominal Interest Rate	4.75%	4.75%
Current, Maturity	$ 17,444,080	$ 19,762,356
Non-current, Maturity	368,292,251	396,598,242
Undiscounted Cash Flow [Member] | Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	12,473,017	13,730,946
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	2,612,406	2,832,647
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	833,743	903,234
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	530,161	574,765
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	2,721,669	2,954,140
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	1,414,018	1,525,571
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	4,361,020	4,940,589
Undiscounted Cash Flow [Member] | More than 90 days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	42,783,373	46,459,559
Undiscounted Cash Flow [Member] | More than 90 days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	7,837,217	8,497,942
Undiscounted Cash Flow [Member] | More than 90 days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	2,501,229	2,709,703
Undiscounted Cash Flow [Member] | More than 90 days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	1,590,483	1,724,294
Undiscounted Cash Flow [Member] | More than 90 days [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	8,165,006	8,862,420
Undiscounted Cash Flow [Member] | More than 90 days [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	9,606,378	9,843,433
Undiscounted Cash Flow [Member] | More than 90 days [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current, Maturity	13,083,060	14,821,767
Undiscounted Cash Flow [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	78,718,927	59,691,577
Undiscounted Cash Flow [Member] | One to Two Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,449,623	11,330,590
Undiscounted Cash Flow [Member] | One to Two Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	3,334,972	3,612,937
Undiscounted Cash Flow [Member] | One to Two Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	2,120,644	2,299,059
Undiscounted Cash Flow [Member] | One to Two Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,886,674	11,816,560
Undiscounted Cash Flow [Member] | One to Two Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,516,773	10,870,075
Undiscounted Cash Flow [Member] | One to Two Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	41,410,241	19,762,356
Undiscounted Cash Flow [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	76,629,479	82,670,989
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,449,623	11,330,590
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	3,334,972	3,612,937
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	2,120,644	2,299,059
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,886,674	11,816,560
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,013,150	10,371,146
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	39,824,416	43,240,697
Undiscounted Cash Flow [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	74,540,030	80,375,483
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,449,623	11,330,590
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	3,334,972	3,612,937
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	2,120,644	2,299,059
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,886,674	11,816,560
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	9,509,527	9,872,218
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	38,238,590	41,444,119
Undiscounted Cash Flow [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	72,450,582	78,079,976
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,449,623	11,330,590
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	3,334,972	3,612,937
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	2,120,644	2,299,059
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	10,886,674	11,816,560
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	9,005,904	9,373,289
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	36,652,765	39,647,541
Undiscounted Cash Flow [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	825,620,475	946,739,110
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-1 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	170,108,928	196,227,387
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-2 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	86,312,007	93,701,216
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon primera Emision S-3 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	51,884,633	56,341,806
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | U.S. Dollars [Member] | Americas [Member] | BNY Mellon - Unica 24296 [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	260,422,345	295,077,973
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander - 317 Serie-H [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	44,726,323	52,887,199
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | Unidades de Fomento [Member] | Chile [Member] | Banco Santander 522 Serie-M [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non-current, Maturity	$ 212,166,239	$ 252,503,529

Appendix 4 Additional Inform214

Appendix 4 Additional Information on Financial Debt - Summary of Financial Lease Obligation by Company (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	$ 1,799,788	$ 1,840,367
Non current finance lease liabilities	$ 12,809,126	$ 15,909,280
U.S. Dollar [Member] | Chile [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.90%	6.90%
U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Nominal Interest Rate	6.50%	6.50%
Current finance lease liabilities	$ 1,799,788	$ 1,840,367
Non current finance lease liabilities	12,809,126	15,909,280
Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	439,377	449,283
Less than 90 Days [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	439,377	449,283
One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,459,000	2,677,880
One to Two Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,459,000	2,677,880
Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	1,916,774	2,677,880
Two to Three Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	1,916,774	2,677,880
Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,041,364	1,959,990
Three to Four Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,041,364	1,959,990
Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,174,053	2,087,390
Four to Five Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,174,053	2,087,390
More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	4,217,935	6,506,140
More Than Five Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	4,217,935	6,506,140
Undiscounted Cash Flow [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	2,737,680	2,934,833
Non current finance lease liabilities	$ 15,328,706	$ 19,481,431
Undiscounted Cash Flow [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Tax payer Id	91.081.000-6	91.081.000-6
Nominal Interest Rate	6.50%	6.50%
Current finance lease liabilities	$ 2,737,680	$ 2,934,833
Non current finance lease liabilities	15,328,706	19,481,431
Undiscounted Cash Flow [Member] | Less than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	685,232	734,006
Undiscounted Cash Flow [Member] | Less than 90 Days [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	685,232	734,006
Undiscounted Cash Flow [Member] | More than 90 Days [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	2,052,448	2,200,827
Undiscounted Cash Flow [Member] | More than 90 Days [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Current finance lease liabilities	2,052,448	2,200,827
Undiscounted Cash Flow [Member] | One to Two Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,728,693	2,931,533
Undiscounted Cash Flow [Member] | One to Two Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,728,693	2,931,533
Undiscounted Cash Flow [Member] | Two to Three Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,719,123	2,928,019
Undiscounted Cash Flow [Member] | Two to Three Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,719,123	2,928,019
Undiscounted Cash Flow [Member] | Three to Four Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,708,931	2,924,276
Undiscounted Cash Flow [Member] | Three to Four Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,708,931	2,924,276
Undiscounted Cash Flow [Member] | Four to Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,698,076	2,920,289
Undiscounted Cash Flow [Member] | Four to Five Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	2,698,076	2,920,289
Undiscounted Cash Flow [Member] | More Than Five Years [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	4,473,883	7,777,314
Undiscounted Cash Flow [Member] | More Than Five Years [Member] | U.S. Dollar [Member] | Transelec S A [Member] | Chile [Member] | Enel Generación Chile S.A. [Member]
Disclosure Of Financial Liabilities [Line Items]
Non current finance lease liabilities	$ 4,473,883	$ 7,777,314

Appendix 5 Details of assets215

Appendix 5 Details of assets and Liabilities in Foreign Currency - Summary of Assets and Liabilities in Foreign Currency (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	$ 419,456,026	$ 245,999,192	$ 144,261,845	$ 133,015,629
Other current financial assets	20,627,062	584,244
Other current non-financial assets	6,002,142	15,831,486
Trade and other current receivables	419,752,286	445,071,856
Current accounts receivable from related parties	71,856,046	52,858,384
Inventories	39,686,942	37,539,596
TOTAL CURRENT ASSETS	1,059,341,785	866,526,937
Other non-current financial assets	33,418,204	28,827,542
Other non-current non-financial assets	13,813,139	13,336,152
Trade and other non-current receivables	36,182,399	33,500,105
Investments accounted for using the equity method	12,707,221	18,738,198	45,716,371
Intangible assets other than goodwill	55,170,904	44,470,750	42,879,326
Goodwill	887,257,655	887,257,655	887,257,655
Property, plant and equipment	3,585,687,137	3,476,128,634
Investment property	8,356,772	8,128,522	$ 8,150,987
Deferred tax assets	2,837,792	21,796,517
TOTAL NON-CURRENT ASSETS	4,635,431,223	4,532,184,075
TOTAL ASSETS	5,694,773,008	5,398,711,012
Other current financial liabilities	18,815,448	25,696,166
Trade and other current payables	594,498,606	561,505,283
Current accounts payable to related parties	119,612,972	90,428,929
Other current provisions	5,636,171	6,493,532
Current tax liabilities	67,027,507	61,599,415
Other current non-financial liabilities	11,225,942	11,523,322
Other non-current financial liabilities	781,978,145	854,016,751
Trade and other non-current payables	659,824	1,483,113
Non-current accounts payable to related parties	318,518	251,527
Deferred tax liabilities	172,223,681	199,364,794
Non-current provisions for employee benefits	57,081,924	59,934,127
Other non-current non-financial liabilities	309,776	313,503
TOTAL NON-CURRENT LIABILITIES	1,090,994,705	1,178,470,723
TOTAL LIABILITIES	1,907,811,351	1,935,717,370
Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	7,999,866	15,021,428
Trade and other current payables	590,848,682	561,505,283
Current accounts payable to related parties	119,538,232	90,428,929
Other current provisions	384,955	6,493,532
Current tax liabilities	904,248	7,966,008
Other current non-financial liabilities		23,330
More than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	10,815,582	10,674,738
Trade and other current payables	3,649,924
Other current provisions	5,251,216
Current tax liabilities	66,123,259	53,633,407
Other current non-financial liabilities	11,225,942	11,499,992
Foreign Currency USD [Member] | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	7,999,743	15,017,154
Trade and other current payables	16,184,962	9,463,287
Current accounts payable to related parties	9,090,837	4,936,256
Foreign Currency USD [Member] | More than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	3,888,150	3,793,737
Foreign Currency Euros [Member] | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other current payables	3,174,586	1,384,882
Current accounts payable to related parties	28,830,246	841,934
Foreign Currency Chilean Peso Non Adjustable | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	123	4,274
Trade and other current payables	570,756,357	549,686,859
Current accounts payable to related parties	81,602,552	84,643,039
Other current provisions	339,536	6,472,673
Current tax liabilities	757,479	7,966,008
Other current non-financial liabilities		23,330
Foreign Currency Chilean Peso Non Adjustable | More than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other current payables	3,649,924
Other current provisions	5,251,216
Current tax liabilities	66,123,259	53,633,407
Other current non-financial liabilities	11,225,942	11,499,992
Foreign Currency Argentine peso [member] | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other current payables	732,777	970,255
Other current provisions	45,419	20,859
Current tax liabilities	146,769
Foreign Currency U.F. [Member] | More than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial liabilities	6,927,432	6,881,001
Foreign Currency Colombian peso [Member] | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Current accounts payable to related parties	12,487	5,461
Foreign Currency Soles [Member] | Less than 90 Days [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Current accounts payable to related parties	2,110	2,239
Details of Assets and Liabilities in Foreign Currency [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	419,456,026	245,999,192
Other current financial assets	20,627,062	584,244
Other current non-financial assets	6,002,142	15,831,486
Trade and other current receivables	419,752,286	445,071,856
Current accounts receivable from related parties	71,856,046	52,858,384
Inventories	39,686,942	37,539,596
Current tax assets	77,756,048	55,649,171
Non- current assets or disposal group held for sale	4,205,233	12,993,008
TOTAL CURRENT ASSETS	1,059,341,785	866,526,937
Other non-current financial assets	33,418,204	28,827,542
Other non-current non-financial assets	13,813,139	13,336,152
Trade and other non-current receivables	36,182,399	33,500,105
Investments accounted for using the equity method	12,707,221	18,738,198
Intangible assets other than goodwill	55,170,904	44,470,750
Goodwill	887,257,655	887,257,655
Property, plant and equipment	3,585,687,137	3,476,128,634
Investment property	8,356,772	8,128,522
Deferred tax assets	2,837,792	21,796,517
TOTAL NON-CURRENT ASSETS	4,635,431,223	4,532,184,075
TOTAL ASSETS	5,694,773,008	5,398,711,012
Details of Assets and Liabilities in Foreign Currency [Member] | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	51,932,458	83,294,443
Trade and other non-current payables	659,824	1,483,113
Non-current accounts payable to related parties	318,518	251,527
Other long-term provisions	52,318	17,912,846
Deferred tax liabilities	55,844,982	66,412,315
Non-current provisions for employee benefits	3,434,185	3,683,376
Other non-current non-financial liabilities	309,776	313,503
TOTAL NON-CURRENT LIABILITIES	112,552,061	173,351,123
TOTAL LIABILITIES	832,302,784	854,789,633
Details of Assets and Liabilities in Foreign Currency [Member] | More Than Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	730,045,687	770,722,308
Other long-term provisions	78,370,519	45,194,062
Deferred tax liabilities	116,378,699	132,952,479
Non-current provisions for employee benefits	53,647,739	56,250,751
TOTAL NON-CURRENT LIABILITIES	978,442,644	1,005,119,600
TOTAL LIABILITIES	1,075,508,567	1,080,927,737
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency USD [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	14,016,336	5,198,139
Other current financial assets	20,441,150	422,705
Other current non-financial assets	902,026	65,138
Trade and other current receivables	5,273,104
Current accounts receivable from related parties	22,793,820	16,780,275
Other non-current financial assets	30,789,705	26,185,923
Other non-current non-financial assets	322,744
Investments accounted for using the equity method	3,783,316	3,982,934
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency USD [Member] | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	29,636,407	61,372,923
Trade and other non-current payables	947
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency USD [Member] | More Than Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	434,446,795	475,084,614
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Euros [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	11,594
Current accounts receivable from related parties	42,663,049	424,692
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Euros [Member] | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other non-current payables		29,952
Non-current accounts payable to related parties	318,518
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Chilean Peso Non Adjustable
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	399,164,751	235,993,647
Other current financial assets	185,912	132,468
Other current non-financial assets	5,067,495	15,709,203
Trade and other current receivables	412,267,621	443,032,735
Current accounts receivable from related parties	6,399,177	33,974,454
Inventories	39,686,942	37,539,596
Current tax assets	77,609,523	55,346,643
Non- current assets or disposal group held for sale	4,205,233	12,993,008
Other non-current financial assets	2,628,499	2,641,619
Other non-current non-financial assets	12,326,385	12,241,662
Trade and other non-current receivables	25,228,146	21,948,173
Investments accounted for using the equity method	8,818,754	14,663,929
Intangible assets other than goodwill	54,917,055	44,276,221
Goodwill	887,257,655	887,257,655
Property, plant and equipment	3,570,236,354	3,460,089,520
Investment property	8,356,772	8,128,522
Deferred tax assets	2,837,792	21,796,517
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Chilean Peso Non Adjustable | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other non-current payables	485,534	565,493
Non-current accounts payable to related parties		251,527
Other long-term provisions	52,318	17,912,846
Deferred tax liabilities	51,385,901	62,661,203
Non-current provisions for employee benefits	3,434,185	3,683,376
Other non-current non-financial liabilities	309,776	313,503
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Chilean Peso Non Adjustable | More Than Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other long-term provisions	78,370,519	45,194,062
Deferred tax liabilities	116,378,699	132,952,479
Non-current provisions for employee benefits	53,647,739	56,250,751
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Argentine peso [member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Cash and cash equivalents	6,263,345	4,807,406
Other current non-financial assets	32,621	57,145
Trade and other current receivables	1,073,072	931,882
Current tax assets	146,525	302,528
Other non-current non-financial assets	378,940	303,837
Trade and other non-current receivables	62,563	27,567
Investments accounted for using the equity method	105,151	91,335
Intangible assets other than goodwill	253,849	194,529
Property, plant and equipment	15,450,783	16,039,114
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Argentine peso [member] | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Trade and other non-current payables	173,343	887,668
Deferred tax liabilities	4,459,081	3,751,112
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency U.F. [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other current financial assets		29,071
Trade and other current receivables	1,138,489	1,107,239
Other non-current non-financial assets	785,070	790,653
Trade and other non-current receivables	10,891,690	11,524,365
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency U.F. [Member] | From One to Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	22,296,051	21,921,520
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency U.F. [Member] | More Than Five Years [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Other non-current financial liabilities	$ 295,598,892	295,637,694
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Real [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Current accounts receivable from related parties		36,276
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Colombian peso [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Current accounts receivable from related parties		1,627,495
Details of Assets and Liabilities in Foreign Currency [Member] | Foreign Currency Soles [Member]
Disclosure Of Assets And Liabilities By Currency [Line Items]
Current accounts receivable from related parties		$ 15,192

Appendix 6 Additional Inform216

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Aging of Trade and Other Receivables (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Trade and Other Receivables [Line Items]
Trade receivables, Current	$ 380,379,326	$ 382,487,300
Other receivables, Current	39,372,960	62,584,556
Trade and other receivables, Current	419,752,286	445,071,856
Trade receivables, Non-current	1,917,828	8,369,878
Other receivables, Non-current	34,264,571	25,130,227
Trade and other receivables, Non-current	36,182,399	33,500,105
Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	415,039,522	414,184,116
Other receivables, Current	48,586,823	70,349,620
Trade and other receivables, Current	463,626,345	484,533,736
Trade receivables, Non-current	1,917,828	8,369,878
Other receivables, Non-current	34,264,571	25,130,227
Trade and other receivables, Non-current	36,182,399	33,500,105
Oficio Circular Official Bulletin No715
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	419,752,286	445,071,856
Trade and other receivables, Non-current	36,182,399	33,500,105
Oficio Circular Official Bulletin No715 | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(34,660,196)	(31,696,816)
Oficio Circular Official Bulletin No715 | Other Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(9,213,863)	(7,765,064)
Oficio Circular Official Bulletin No715 | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	415,039,522	414,184,116
Other receivables, Current	48,586,823	70,349,620
Trade receivables, Non-current	1,917,828	8,369,878
Other receivables, Non-current	34,264,571	25,130,227
Oficio Circular Official Bulletin No715 | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	330,701,026	342,836,256
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(89,762)	(157,009)
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	291,417,828	280,408,709
Other receivables, Current	39,372,960	62,584,556
Oficio Circular Official Bulletin No715 | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	33,399,262	33,897,290
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(231,131)	(221,810)
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	33,630,393	34,119,100
Oficio Circular Official Bulletin No715 | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	17,293,165	14,268,110
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(213,455)	(212,406)
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	17,506,620	14,480,516
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	3,796,047	4,094,395
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(200,097)	(168,457)
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,996,144	4,262,852
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	1,965,584	2,155,961
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(223,821)	(109,571)
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,189,405	2,265,532
Oficio Circular Official Bulletin No715 | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	4,388,548	5,872,964
Oficio Circular Official Bulletin No715 | 121-150 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(176,789)	(110,910)
Oficio Circular Official Bulletin No715 | 121-150 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,565,337	5,983,874
Oficio Circular Official Bulletin No715 | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	2,654,063	2,766,214
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(207,518)	(174,725)
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,861,581	2,940,939
Oficio Circular Official Bulletin No715 | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	1,556,493	1,360,066
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(914,480)	(766,217)
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,470,973	2,126,283
Oficio Circular Official Bulletin No715 | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	1,663,913	4,143,730
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(133,045)	(103,001)
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,796,958	4,246,731
Oficio Circular Official Bulletin No715 | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Trade and other receivables, Current	22,334,185	33,676,870
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Trade Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(32,270,098)	(29,672,710)
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Other Receivables [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(9,213,863)	(7,765,064)
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	54,604,283	63,349,580
Other receivables, Current	$ 9,213,863	$ 7,765,064

Appendix 6 Additional Inform217

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Trade and Other Receivables by Type of Portfolio (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017CLP ($)Customer	Dec. 31, 2016CLP ($)Customer
Trade and Other Receivables [Line Items]
Gross Amount	$ 419,752,286	$ 445,071,856
Oficio Circular Official Bulletin No715
Trade and Other Receivables [Line Items]
Gross Amount	$ 419,752,286	$ 445,071,856
Oficio Circular Official Bulletin No715 | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	1,914,448	1,864,801
Gross Amount	$ 398,280,396	$ 405,185,257
Oficio Circular Official Bulletin No715 | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	96,770	99,429
Gross Amount	$ 18,676,954	$ 17,368,737
Oficio Circular Official Bulletin No715 | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	2,011,218	1,964,230
Gross Amount	$ 416,957,350	$ 422,553,994
Oficio Circular Official Bulletin No715 | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 330,701,026	$ 342,836,256
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	1,145,472	1,157,940
Gross Amount	$ 288,681,858	$ 281,705,071
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	52,679	60,278
Gross Amount	$ 4,653,798	$ 5,850,339
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	1,198,151	1,218,218
Gross Amount	$ 293,335,656	$ 287,555,410
Oficio Circular Official Bulletin No715 | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 33,399,262	$ 33,897,290
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	451,929	414,617
Gross Amount	$ 30,202,328	$ 30,167,962
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	22,869	22,459
Gross Amount	$ 3,428,065	$ 3,951,138
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	474,798	437,076
Gross Amount	$ 33,630,393	$ 34,119,100
Oficio Circular Official Bulletin No715 | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 17,293,165	$ 14,268,110
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	133,114	107,539
Gross Amount	$ 15,573,493	$ 12,724,070
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	8,780	8,312
Gross Amount	$ 1,933,127	$ 1,756,446
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	141,894	115,851
Gross Amount	$ 17,506,620	$ 14,480,516
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 3,796,047	$ 4,094,395
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	22,305	18,344
Gross Amount	$ 3,228,258	$ 3,813,933
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	2,795	2,128
Gross Amount	$ 767,886	$ 448,919
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	25,100	20,472
Gross Amount	$ 3,996,144	$ 4,262,852
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 1,965,584	$ 2,155,961
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	9,505	8,987
Gross Amount	$ 1,817,086	$ 1,978,892
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	1,422	1,049
Gross Amount	$ 372,319	$ 286,640
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	10,927	10,036
Gross Amount	$ 2,189,405	$ 2,265,532
Oficio Circular Official Bulletin No715 | One hundred and twenty one to three Hundred sixty five days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	7,118	5,866
Gross Amount	$ 4,216,619	$ 5,753,020
Oficio Circular Official Bulletin No715 | One hundred and twenty one to three Hundred sixty five days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	1,093	656
Gross Amount	$ 348,718	$ 230,854
Oficio Circular Official Bulletin No715 | One hundred and twenty one to three Hundred sixty five days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	8,211	6,522
Gross Amount	$ 4,565,337	$ 5,983,874
Oficio Circular Official Bulletin No715 | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 2,654,063	$ 2,766,214
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	5,333	4,671
Gross Amount	$ 2,526,954	$ 2,415,755
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	699	442
Gross Amount	$ 334,627	$ 525,184
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	6,032	5,113
Gross Amount	$ 2,861,581	$ 2,940,939
Oficio Circular Official Bulletin No715 | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 1,556,493	$ 1,360,066
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	10,103	20,001
Gross Amount	$ 2,127,005	$ 2,016,444
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	446	275
Gross Amount	$ 343,968	$ 109,839
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	10,549	20,276
Gross Amount	$ 2,470,973	$ 2,126,283
Oficio Circular Official Bulletin No715 | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 1,663,913	$ 4,143,730
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	3,979	3,535
Gross Amount	$ 1,599,571	$ 4,163,062
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	394	217
Gross Amount	$ 197,387	$ 83,669
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	4,373	3,752
Gross Amount	$ 1,796,958	$ 4,246,731
Oficio Circular Official Bulletin No715 | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Gross Amount	$ 22,334,185	$ 33,676,870
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	125,590	123,301
Gross Amount	$ 48,307,224	$ 60,447,048
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	5,593	3,613
Gross Amount	$ 6,297,059	$ 4,125,709
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Gross Portfolio [Member]
Trade and Other Receivables [Line Items]
Number of Customers | Customer	131,183	126,914
Gross Amount	$ 54,604,283	$ 64,572,757

Appendix 6 Additional Inform218

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Portfolio in Default and in Legal Collection Process of Notes Receivable (Detail) - Notes Receivable2 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017CLP ($)Customer	Dec. 31, 2016CLP ($)Customer
Portfolio In Default And In Legal Collection Process [Line Items]
Number of Customers | Customer	4,646	5,557
Amount | $	$ 6,301,230	$ 7,312,781
Notes receivable in default [Member]
Portfolio In Default And In Legal Collection Process [Line Items]
Number of Customers | Customer	1,902	1,949
Amount | $	$ 259,560	$ 262,912
Notes receivable in legal collection process [Member]
Portfolio In Default And In Legal Collection Process [Line Items]
Number of Customers | Customer	2,744	3,608
Amount | $	$ 6,041,670	$ 7,049,869

Appendix 6 Additional Inform219

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Provisions and Write-offs Portfolio (Detail) - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Provisions and Write-offs for Portfolio [Line Items]
Provisions and Write-offs	$ 7,937,817	$ 4,172,291
Non-renegotiated Portfolio [Member]
Provisions and Write-offs for Portfolio [Line Items]
Provisions and Write-offs	7,928,877	4,919,244
Renegotiated Portfolio [Member]
Provisions and Write-offs for Portfolio [Line Items]
Provisions and Write-offs	$ 8,940	$ (746,953)

Appendix 6 Additional Inform220

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Number and Value of Operations (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017CLP ($)Operation	Dec. 31, 2016CLP ($)Operation	Dec. 31, 2017CLP ($)Operation	Dec. 31, 2016CLP ($)Operation
Impairment Provisions And Recoveries [Abstract]
Number of operations | Operation	5,376	11,092	46,484	1,949,771
Value of operations | $	$ 4,058,212	$ 74,563	$ 7,937,817	$ 4,172,291

Appendix 6 Additional Inform221

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Trade Receivables by Aging (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Trade and Other Receivables [Line Items]
Trade receivables, Current	$ 380,379,326	$ 382,487,300
Trade and other receivables, Current	419,752,286	445,071,856
Trade receivables, Non-current	1,917,828	8,369,878
Trade and other receivables, Non-current	36,182,399	33,500,105
Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	415,039,522	414,184,116
Trade and other receivables, Current	463,626,345	484,533,736
Trade receivables, Non-current	1,917,828	8,369,878
Trade and other receivables, Non-current	36,182,399	33,500,105
Portfolio stratification [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(34,660,196)	(31,696,816)
Trade and other receivables, Current	380,379,326	382,487,300
Trade and other receivables, Non-current	1,917,828	8,369,878
Portfolio stratification [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	415,039,522	414,184,116
Trade receivables, Non-current	1,917,828	8,369,878
Portfolio stratification [Member] | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(89,762)	(157,009)
Trade and other receivables, Current	291,328,066	280,251,700
Portfolio stratification [Member] | Current Portfolio [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	291,417,828	280,408,709
Portfolio stratification [Member] | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(231,131)	(221,810)
Trade and other receivables, Current	33,399,262	33,897,290
Portfolio stratification [Member] | 1-30 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	33,630,393	34,119,100
Portfolio stratification [Member] | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(213,455)	(212,406)
Trade and other receivables, Current	17,293,165	14,268,110
Portfolio stratification [Member] | 31-60 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	17,506,620	14,480,516
Portfolio stratification [Member] | 61 - 90 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(200,097)
Trade and other receivables, Current	3,796,047
Portfolio stratification [Member] | 61 - 90 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,996,144
Portfolio stratification [Member] | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(223,821)	(109,571)
Trade and other receivables, Current	1,965,584	2,155,961
Portfolio stratification [Member] | 91 - 120 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,189,405	2,265,532
Portfolio stratification [Member] | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(176,789)	(110,910)
Trade and other receivables, Current	4,388,548	5,872,964
Portfolio stratification [Member] | 121-150 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,565,337	5,983,874
Portfolio stratification [Member] | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(207,518)	(174,725)
Trade and other receivables, Current	2,654,063	2,766,214
Portfolio stratification [Member] | 151-180 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,861,581	2,940,939
Portfolio stratification [Member] | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(914,480)	(766,217)
Trade and other receivables, Current	1,556,493	1,360,066
Portfolio stratification [Member] | 181-210 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,470,973	2,126,283
Portfolio stratification [Member] | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(133,045)	(103,001)
Trade and other receivables, Current	1,663,913	4,143,730
Portfolio stratification [Member] | 211-250 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,796,958	4,246,731
Portfolio stratification [Member] | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(1,980,707)	(1,929,264)
Trade and other receivables, Current	3,902,986	10,338,654
Portfolio stratification [Member] | More than 251 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	5,883,693	12,267,918
Portfolio stratification [Member] | More than 365 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts	(30,289,391)	(27,743,446)
Trade and other receivables, Current	18,431,199	23,338,216
Portfolio stratification [Member] | More than 365 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	48,720,590	51,081,662
Portfolio stratification [Member] | 61-90 days [Member]
Trade and Other Receivables [Line Items]
Allowance for doubtful accounts		(168,457)
Trade and other receivables, Current		4,094,395
Portfolio stratification [Member] | 61-90 days [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		4,262,852
Portfolio stratification [Member] | Trade receivables, generation [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	195,570,350	214,479,116
Allowance for doubtful accounts	(1,258,817)	(1,314,310)
Trade receivables, Non-current	62,563	5,751,509
Portfolio stratification [Member] | Trade receivables, generation [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	195,525,065	214,463,264
Trade receivables, Non-current		5,723,942
Portfolio stratification [Member] | Trade receivables, generation [Member] | Others [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	45,285	15,852
Trade receivables, Non-current	62,563	27,567
Portfolio stratification [Member] | Trade receivables, generation [Member] | Unbilled services [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	138,781,170	125,367,509
Trade receivables, Non-current		3,308,454
Portfolio stratification [Member] | Trade receivables, generation [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	56,789,180	89,111,607
Trade receivables, Non-current	62,563	2,443,055
Portfolio stratification [Member] | Trade receivables, generation [Member] | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	186,769,753	179,498,353
Portfolio stratification [Member] | Trade receivables, generation [Member] | Current Portfolio [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	186,724,468	179,482,501
Portfolio stratification [Member] | Trade receivables, generation [Member] | Current Portfolio [Member] | Others [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	45,285	15,852
Portfolio stratification [Member] | Trade receivables, generation [Member] | Current Portfolio [Member] | Unbilled services [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	138,781,170	125,367,509
Portfolio stratification [Member] | Trade receivables, generation [Member] | Current Portfolio [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	47,988,583	54,130,844
Portfolio stratification [Member] | Trade receivables, generation [Member] | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,057,994	2,770,582
Portfolio stratification [Member] | Trade receivables, generation [Member] | 1-30 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,057,994	2,770,582
Portfolio stratification [Member] | Trade receivables, generation [Member] | 1-30 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,057,994	2,770,582
Portfolio stratification [Member] | Trade receivables, generation [Member] | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	333,079	1,165,177
Portfolio stratification [Member] | Trade receivables, generation [Member] | 31-60 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	333,079	1,165,177
Portfolio stratification [Member] | Trade receivables, generation [Member] | 31-60 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	333,079	1,165,177
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61 - 90 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	279,100
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61 - 90 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	279,100
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61 - 90 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	279,100
Portfolio stratification [Member] | Trade receivables, generation [Member] | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	10,021	900,093
Portfolio stratification [Member] | Trade receivables, generation [Member] | 91 - 120 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	10,021	900,093
Portfolio stratification [Member] | Trade receivables, generation [Member] | 91 - 120 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	10,021	900,093
Portfolio stratification [Member] | Trade receivables, generation [Member] | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	42,015	5,101,117
Portfolio stratification [Member] | Trade receivables, generation [Member] | 121-150 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	42,015	5,101,117
Portfolio stratification [Member] | Trade receivables, generation [Member] | 121-150 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	42,015	5,101,117
Portfolio stratification [Member] | Trade receivables, generation [Member] | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	334,298	13,609
Portfolio stratification [Member] | Trade receivables, generation [Member] | 151-180 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	334,298	13,609
Portfolio stratification [Member] | Trade receivables, generation [Member] | 151-180 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	334,298	13,609
Portfolio stratification [Member] | Trade receivables, generation [Member] | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	399,552	553,986
Portfolio stratification [Member] | Trade receivables, generation [Member] | 181-210 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	399,552	553,986
Portfolio stratification [Member] | Trade receivables, generation [Member] | 181-210 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	399,552	553,986
Portfolio stratification [Member] | Trade receivables, generation [Member] | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	228,498	3,593,733
Portfolio stratification [Member] | Trade receivables, generation [Member] | 211-250 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	228,498	3,593,733
Portfolio stratification [Member] | Trade receivables, generation [Member] | 211-250 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	228,498	3,593,733
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,596,976	9,600,268
Allowance for doubtful accounts	(1,103,086)	(1,314,310)
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 251 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,596,976	9,600,268
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 251 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,596,976	9,600,268
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 365 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,519,064	10,508,696
Allowance for doubtful accounts	(155,731)
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 365 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,519,064	10,508,696
Portfolio stratification [Member] | Trade receivables, generation [Member] | More than 365 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,519,064	10,508,696
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61-90 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		773,502
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61-90 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		773,502
Portfolio stratification [Member] | Trade receivables, generation [Member] | 61-90 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		773,502
Portfolio stratification [Member] | Trade receivables, distribution [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	219,469,172	199,705,000
Allowance for doubtful accounts	(33,401,379)	(30,382,506)
Trade receivables, Non-current	1,855,265	2,618,369
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	46,268,655	46,060,239
Trade receivables, Non-current		34,602
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	20,269,884	16,218,016
Trade receivables, Non-current	73,844	418,837
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	152,930,633	137,426,745
Trade receivables, Non-current	1,781,421	2,164,930
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Unbilled services [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	77,733,438	61,742,593
Trade receivables, Non-current		149,508
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	141,735,734	137,962,407
Trade receivables, Non-current	1,855,265	2,465,400
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	104,648,075	100,910,356
Allowance for doubtful accounts	(89,762)	(157,009)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	17,771,942	23,586,354
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,284,317	2,588,284
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	84,591,816	74,735,718
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member] | Unbilled services [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	77,733,438	61,742,593
Portfolio stratification [Member] | Trade receivables, distribution [Member] | Current Portfolio [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	26,914,637	39,167,763
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	30,572,399	31,348,518
Allowance for doubtful accounts	(231,131)	(221,810)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 1-30 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	6,565,888	6,566,919
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 1-30 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,858,506	1,462,718
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 1-30 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	22,148,005	23,318,881
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 1-30 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	30,572,399	31,348,518
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	17,173,541	13,315,339
Allowance for doubtful accounts	(213,455)	(212,406)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 31-60 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,987,871	2,148,243
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 31-60 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,485,719	1,608,808
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 31-60 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	10,699,951	9,558,288
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 31-60 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	17,173,541	13,315,339
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61 - 90 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,717,044
Allowance for doubtful accounts	(200,097)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61 - 90 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	940,754
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61 - 90 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	511,663
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61 - 90 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,264,627
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61 - 90 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	3,717,044
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,179,384	1,365,439
Allowance for doubtful accounts	(223,821)	(109,571)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	168,838	209,825
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	352,568	293,543
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,657,978	862,071
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,179,384	1,365,439
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,523,322	882,757
Allowance for doubtful accounts	(176,789)	(110,910)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 121-150 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,809,919	172,851
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 121-150 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,481,759	94,247
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 121-150 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,231,644	615,659
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 121-150 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,523,322	882,757
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,527,283	2,927,330
Allowance for doubtful accounts	(207,518)	(174,725)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 151-180 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	357,379	1,174,012
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 151-180 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,251,547	1,218,522
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 151-180 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	918,357	534,796
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 151-180 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,527,283	2,927,330
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,071,421	1,572,297
Allowance for doubtful accounts	(914,480)	(766,217)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 181-210 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	30,481	46,128
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 181-210 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	340,335	746,228
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 181-210 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,700,605	779,941
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 181-210 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	2,071,421	1,572,297
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,568,460	652,998
Allowance for doubtful accounts	(133,045)	(103,001)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 211-250 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	7,237	2,424
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 211-250 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	994,071	303,176
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 211-250 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	567,152	347,398
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 211-250 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,568,460	652,998
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,286,717	2,667,650
Allowance for doubtful accounts	(877,621)	(614,954)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 251 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,295,122	766,851
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 251 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,182,949	698,061
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 251 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	1,808,646	1,202,738
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 251 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	4,286,717	2,667,650
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 365 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	46,201,526	40,572,966
Allowance for doubtful accounts	(30,133,660)	(27,743,446)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 365 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	12,333,224	10,154,924
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 365 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	8,526,450	6,927,812
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 365 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	25,341,852	23,490,230
Portfolio stratification [Member] | Trade receivables, distribution [Member] | More than 365 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current	$ 46,201,526	40,572,966
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61-90 days [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		3,489,350
Allowance for doubtful accounts		(168,457)
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61-90 days [Member] | Large customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		1,231,708
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61-90 days [Member] | Institutional customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		276,617
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61-90 days [Member] | Mass-market Customers [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		1,981,025
Portfolio stratification [Member] | Trade receivables, distribution [Member] | 61-90 days [Member] | Services billed [Member]
Trade and Other Receivables [Line Items]
Trade receivables, Current		$ 3,489,350

Appendix 6 Additional Inform222

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Type of Portfolio (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Trade and Other Receivables [Line Items]
Trade and other current receivables	$ 419,752,286	$ 445,071,856
Non-current receivables	36,182,399	33,500,105
Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	463,626,345	484,533,736
Non-current receivables	36,182,399	33,500,105
Portfolio By Type
Trade and Other Receivables [Line Items]
Trade and other current receivables	291,372,543
Portfolio By Type | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	33,630,393	34,119,100
Portfolio By Type | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	17,506,620	14,480,516
Portfolio By Type | 61-90 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,996,144	4,262,852
Portfolio By Type | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,189,405	2,265,532
Portfolio By Type | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	4,565,337	5,983,874
Portfolio By Type | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,861,581	2,940,939
Portfolio By Type | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,470,973	2,126,283
Portfolio By Type | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,796,958	4,246,731
Portfolio By Type | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	54,604,283	63,349,579
Portfolio By Type | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		280,408,709
Portfolio By Type | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	415,039,522	414,184,115
Non-current receivables	1,917,828	8,369,878
Portfolio By Type | Trade receivables, generation [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	186,724,468
Portfolio By Type | Trade receivables, generation [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	45,285
Portfolio By Type | Trade receivables, generation [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,057,994	2,770,582
Portfolio By Type | Trade receivables, generation [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	333,079	1,165,177
Portfolio By Type | Trade receivables, generation [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	279,100	773,502
Portfolio By Type | Trade receivables, generation [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	10,021	900,093
Portfolio By Type | Trade receivables, generation [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	42,015	5,101,117
Portfolio By Type | Trade receivables, generation [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	334,298	13,609
Portfolio By Type | Trade receivables, generation [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	399,552	553,986
Portfolio By Type | Trade receivables, generation [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	228,498	3,593,733
Portfolio By Type | Trade receivables, generation [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	4,116,040	20,108,963
Portfolio By Type | Trade receivables, generation [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		179,498,353
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	186,724,468
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,057,994	2,770,582
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	333,079	1,165,177
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	279,100	773,502
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	10,021	900,093
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	42,015	5,101,117
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	334,298	13,609
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	399,552	553,986
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	228,498	3,593,733
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	4,116,040	20,108,963
Portfolio By Type | Trade receivables, generation [Member] | Large customers [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		179,482,501
Portfolio By Type | Trade receivables, generation [Member] | Others [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	45,285
Portfolio By Type | Trade receivables, generation [Member] | Others [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		15,852
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		5,751,509
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	195,525,065	214,479,115
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	45,285
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		5,723,942
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	195,525,065	214,463,263
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Others [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		27,567
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Others [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		15,852
Portfolio By Type | Trade receivables, generation [Member] | Gross Carrying Amount [Member] | Others [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	45,285
Portfolio By Type | Trade receivables, distribution [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	101,580,927
Portfolio By Type | Trade receivables, distribution [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,067,148
Portfolio By Type | Trade receivables, distribution [Member] | 1-30 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		3,951,138
Portfolio By Type | Trade receivables, distribution [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	27,144,334	27,397,380
Portfolio By Type | Trade receivables, distribution [Member] | 1-30 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,428,065
Portfolio By Type | Trade receivables, distribution [Member] | 31-60 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		1,756,446
Portfolio By Type | Trade receivables, distribution [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	15,240,414	11,558,893
Portfolio By Type | Trade receivables, distribution [Member] | 31-60 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,933,127
Portfolio By Type | Trade receivables, distribution [Member] | 61-90 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		448,919
Portfolio By Type | Trade receivables, distribution [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,949,158	3,040,431
Portfolio By Type | Trade receivables, distribution [Member] | 61-90 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	767,886
Portfolio By Type | Trade receivables, distribution [Member] | 91 - 120 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		286,640
Portfolio By Type | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,807,065	1,078,799
Portfolio By Type | Trade receivables, distribution [Member] | 91 - 120 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	372,319
Portfolio By Type | Trade receivables, distribution [Member] | 121-150 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		230,854
Portfolio By Type | Trade receivables, distribution [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	4,174,604	651,903
Portfolio By Type | Trade receivables, distribution [Member] | 121-150 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	348,718
Portfolio By Type | Trade receivables, distribution [Member] | 151-180 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		525,184
Portfolio By Type | Trade receivables, distribution [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,192,656	2,402,146
Portfolio By Type | Trade receivables, distribution [Member] | 151-180 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	334,627
Portfolio By Type | Trade receivables, distribution [Member] | 181-210 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		109,839
Portfolio By Type | Trade receivables, distribution [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,727,453	1,462,458
Portfolio By Type | Trade receivables, distribution [Member] | 181-210 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	343,968
Portfolio By Type | Trade receivables, distribution [Member] | 211-250 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		83,669
Portfolio By Type | Trade receivables, distribution [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,371,073	569,329
Portfolio By Type | Trade receivables, distribution [Member] | 211-250 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	197,387
Portfolio By Type | Trade receivables, distribution [Member] | More than 251 days [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		4,125,709
Portfolio By Type | Trade receivables, distribution [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	44,191,184	39,114,907
Portfolio By Type | Trade receivables, distribution [Member] | More than 251 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	6,297,059
Portfolio By Type | Trade receivables, distribution [Member] | Current Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		3,987,901
Portfolio By Type | Trade receivables, distribution [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		96,922,455
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	17,522,970
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	248,972
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	6,565,888	6,499,554
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 1-30 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		67,366
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	4,590,254	2,148,243
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 31-60 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	397,617
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	940,754	1,231,708
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	168,838	209,825
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,809,919	146,867
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 121-150 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		25,984
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	357,379	1,174,012
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	30,481	46,128
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	7,237	2,424
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	13,521,914	10,921,775
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | More than 251 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	106,433
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		23,376,286
Portfolio By Type | Trade receivables, distribution [Member] | Large customers [Member] | Current Portfolio [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		210,068
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,271,061
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	13,256
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,458,386	742,560
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 1-30 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	400,120	720,158
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,326,869	1,276,089
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 31-60 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	158,851	332,719
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	302,412	276,617
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 61-90 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	209,251
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	352,568	293,193
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 91 - 120 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		350
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,481,759	94,247
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,163,383	850,424
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 151-180 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	88,164	368,098
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	142,797	746,228
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 181-210 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	197,538
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	940,106	301,331
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | 211-250 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	53,965	1,845
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	9,682,123	7,610,652
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | More than 251 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	27,276	15,221
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		2,211,715
Portfolio By Type | Trade receivables, distribution [Member] | Institutional customers [Member] | Current Portfolio [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		376,569
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	81,786,896
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	2,804,920
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 1-30 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	19,120,060	20,155,266
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 1-30 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	3,027,945	3,163,614
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 31-60 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	9,323,291	8,134,561
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 31-60 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,376,659	1,423,727
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 61-90 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,705,992	1,532,106
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 61-90 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	558,635	448,919
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 91 - 120 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,285,659	575,781
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 91 - 120 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	372,319	286,290
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 121-150 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	882,926	410,789
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 121-150 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	348,718	204,870
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 151-180 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	671,894	377,710
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 151-180 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	246,463	157,086
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 181-210 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,554,175	670,102
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 181-210 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	146,430	109,839
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 211-250 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	423,730	265,574
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | 211-250 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	143,422	81,824
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | More than 251 days [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	20,987,147	20,582,480
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | More than 251 days [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	6,163,350	4,110,488
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | Current Portfolio [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		71,334,454
Portfolio By Type | Trade receivables, distribution [Member] | Mass-market Customers [Member] | Current Portfolio [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		3,401,264
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables		15,506,299
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		755,931
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		1,862,438
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	202,378,868	184,198,701
Non-current receivables	376,463
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	17,090,304
Non-current receivables	1,478,802
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		34,602
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Large customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	45,515,634	45,756,822
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Large customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	753,022	303,418
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Institutional customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		418,837
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Institutional customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	19,121,464	14,403,056
Non-current receivables	34,400
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Institutional customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	1,148,421	1,814,960
Non-current receivables	39,444
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Mass-market Customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		721,329
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Mass-market Customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Non-current receivables		1,443,601
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Mass-market Customers [Member] | Non-renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	137,741,770	124,038,823
Non-current receivables	342,063
Portfolio By Type | Trade receivables, distribution [Member] | Gross Carrying Amount [Member] | Mass-market Customers [Member] | Renegotiated Portfolio [Member]
Trade and Other Receivables [Line Items]
Trade and other current receivables	15,188,861	$ 13,387,921
Non-current receivables	$ 1,439,358

Appendix 6 Additional Inform223

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Estimated Sales and Purchases of Energy and Capacity - Statement of Financial Position (Detail) - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of estimated sales and purchases of energy and capacity [Line Items]
Receivables from related parties Current	$ 71,856,046	$ 52,858,384
Trade and other current receivables	419,752,286	445,071,856
Accounts payable to related parties Current	119,612,972	90,428,929
Trade and other current payables	594,498,606	561,505,283
Estimated Sales and Purchases of Energy and Capacity [Member] | Energy and Tolls [Member]
Disclosure of estimated sales and purchases of energy and capacity [Line Items]
Receivables from related parties Current	5,518,711	590,636
Trade and other current receivables	177,886,960	168,833,728
Total Estimated Assets	183,405,671	169,424,364
Accounts payable to related parties Current	21,818,299	13,459,812
Trade and other current payables	120,451,406	85,425,025
Total Estimated Liabilities	142,269,705	98,884,837
Estimated Sales and Purchases of Energy and Capacity [Member] | Capacity [Member]
Disclosure of estimated sales and purchases of energy and capacity [Line Items]
Receivables from related parties Current	466,031	21,774
Trade and other current receivables	48,122,678	23,276,222
Total Estimated Assets	48,588,709	23,297,996
Accounts payable to related parties Current	177,839	191,936
Trade and other current payables	47,893,119	42,571,883
Total Estimated Liabilities	$ 48,070,958	$ 42,763,819

Appendix 6 Additional Inform224

Appendix 6 Additional Information Oficio Circular (Official Bulletin) No. 715 of February 3, 2012 - Summary of Estimated Sales and Purchases of Energy and Capacity - Income Statement (Detail) - Estimated Sales and Purchases of Energy and Capacity [Member] - CLP ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Energy and Tolls [Member]
Disclosure of estimated sales and purchases of energy and capacity [Line Items]
Energy Sales	$ 183,405,671	$ 169,424,364	$ 216,908,877
Energy Purchases	142,269,706	98,884,837	101,922,626
Capacity [Member]
Disclosure of estimated sales and purchases of energy and capacity [Line Items]
Energy Sales	48,588,709	23,297,996	34,686,488
Energy Purchases	$ 48,070,958	$ 42,763,819	$ 43,935,488

Appendix 7 Details of Due Da225

Appendix 7 Details of Due Dates of Payments to Suppliers - Summary of Details of Due Dates of Payments to Suppliers (Detail) - Details of Due Dates of Payments to Suppliers [Member] - CLP ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	$ 185,342,238	$ 158,763,714
Services [Member]
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	94,132,902	90,386,018
Other [Member]
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	91,209,336	68,377,696
Up to 30 days [Member]
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	185,342,238	158,763,714
Up to 30 days [Member] | Services [Member]
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	94,132,902	90,386,018
Up to 30 days [Member] | Other [Member]
Details of due dates of payments to suppliers [Line Items]
Current Payments to suppliers	$ 91,209,336	$ 68,377,696