Brookfield Infrastructure Partners (BIP) 20-F 14 Mar 18 2017 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017shares
Document And Entity Information [Abstract]
Entity Registrant Name	Brookfield Infrastructure Partners L.P.
Entity Central Index Key	1,406,234
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	20-F
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding	276,572,900
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 374	$ 786
Financial assets	192	241
Accounts receivable and other	838	504
Inventory	108	101
Current assets	1,512	1,632
Property, plant and equipment	9,937	8,656
Intangible assets	9,894	4,465
Investments in associates and joint ventures	5,572	4,727
Investment properties	192	154
Goodwill	1,301	502
Financial assets	730	900
Other assets	273	165
Deferred income tax asset	66	74
Total assets	29,477	21,275
Liabilities
Accounts payable and other	864	712
Corporate borrowings	99	295
Non-recourse borrowings	364	279
Financial liabilities	237	229
Current liabilities	1,564	1,515
Corporate borrowings	2,002	707
Non-recourse borrowings	7,699	7,045
Financial liabilities	1,076	152
Other liabilities	793	580
Deferred income tax liability	2,849	1,612
Preferred shares	20	20
Total liabilities	16,003	11,631
Partnership capital
Limited partners	4,967	4,611
General partner	25	27
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	2,012	1,860
Interest of others in operating subsidiaries	5,875	2,771
Preferred unitholders	595	375
Total partnership capital	13,474	9,644
Total liabilities and partnership capital	$ 29,477	$ 21,275

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATING RESULTS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Profit or loss [abstract]
Revenues	$ 3,535	$ 2,115		$ 1,855
Direct operating costs	(1,509)	(1,063)		(798)
General and administrative expenses	(239)	(166)		(134)
Depreciation and amortization expense	(671)	(447)		(375)
Profit (loss) from operating activities	1,116	439		548
Interest expense	(428)	(392)		(367)
Share of earnings from investments in associates and joint ventures	118	248		69
Mark-to-market on hedging items	(66)	74		83
Other income	7	174		54
Income before income tax	747	543		387
Income tax (expense) recovery
Current	(106)	(33)		(22)
Deferred	(67)	18		26
Net income	574	528	[1]	391	[1]
Attributable to:
Limited partners	11	285		169
General partner	113	84		66
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	1	118		66
Interest of others in operating subsidiaries	$ 449	$ 41		$ 90
Basic and diluted (loss) earnings per unit attributable to:
Limited partners	$ (0.04)	$ 1.13		$ 0.69
[1]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Statement of comprehensive income [abstract]
Net income	$ 574	$ 528	[1]	$ 391	[1]
Items that will not be reclassified subsequently to profit or loss:
Revaluation of property, plant and equipment	418	335		646
Unrealized actuarial gains (losses)	8	(49)		26
Taxes on the above items	(206)	(83)		(131)
Equity accounted investments	259	199		173
Other comprehensive income that will not be reclassified to profit or loss, net of tax	479	402		714
Items that may be reclassified subsequently to profit or loss:
Foreign currency translation	38	(37)		(928)
Cash flow hedge	137	(1)		(41)
Net investment hedge	(266)	169		89
Available-for-sale securities	5	9		(33)
Taxes on the above items	6	8		(10)
Equity accounted investments	(76)	26		7
Other comprehensive income that will be reclassified to profit or loss, net of tax	(156)	174		(916)
Total other comprehensive income (loss)	323	576		(202)
Comprehensive income	897	1,104		189
Attributable to:
Limited partners	139	643		83
General partner	112	88		65
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	57	265		34
Interest of others in operating subsidiaries	$ 589	$ 108		$ 7
[1]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

CONSOLIDATED STATEMENTS OF PART

CONSOLIDATED STATEMENTS OF PARTNERSHIP CAPITAL - USD ($) $ in Millions		Total	Non-controlling interest—in operating subsidiaries	Preferred Unitholders Capital	Limited Partners	Limited PartnersPartners' capital	Limited Partners(Deficit) Retained earnings	Limited PartnersOwnership Changes	Limited PartnersAccumulated Other Comprehensive Income	[1]	General Partner	General PartnerPartners' capital	General Partner(Deficit) Retained earnings	General PartnerAccumulated Other Comprehensive Income	[1]	Non-Controlling Interest—Redeemable Partnership Units held by Brookfield	Non-Controlling Interest—Redeemable Partnership Units held by BrookfieldPartners' capital	Non-Controlling Interest—Redeemable Partnership Units held by Brookfield(Deficit) Retained earnings	Non-Controlling Interest—Redeemable Partnership Units held by BrookfieldOwnership Changes	Non-Controlling Interest—Redeemable Partnership Units held by BrookfieldAccumulated Other Comprehensive Income	[1]
Balance as at Dec. 31, 2014		$ 6,322	$ 1,444	$ 0	$ 3,533	$ 3,201	$ (400)	$ 77	$ 655		$ 24	$ 19	$ 0	$ 5		$ 1,321	$ 1,178	$ (170)	$ 30	$ 283
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	[2]	391	90		169		169				66		66			66		66
Other comprehensive income (loss)		(202)	(83)		(86)				(86)		(1)			(1)		(32)				(32)
Comprehensive income		189	7	0	83		169		(86)		65		66	(1)		34		66		(32)
Unit issuance (note 26)		932		189	582	582										350	350
Unit repurchases (note 26)		(67)			(67)	(67)
Partnership distributions (note 28)		(543)		(3)	(339)		(339)				(66)		(66)			(138)		(138)
Partnership preferred distributions (note 28)	[2]	(3)			(3)		(3)
Acquisition of subsidiaries (note 5)		347	347
Subsidiary distributions to non-controlling interest		(91)	(91)
Disposition of interests (note 11)		(99)	(99)				8		(8)									3		(3)
Preferred unit issuance (note 26)		189		189
Other items (note 26)		0			49		6	49	(6)							(49)		(6)	(49)	6
Balance as at Dec. 31, 2015		7,176	1,608	189	3,838	3,716	(559)	126	555		23	19	0	4		1,518	1,528	(245)	(19)	254
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	[2]	528	41	0	285		285				84		84			118		118
Other comprehensive income (loss)		576	67		358				358		4			4		147				147
Comprehensive income		1,104	108	0	643		285		358		88		84	4		265		118		147
Unit issuance (note 26)		755		186	505	505										250	250
Unit repurchases (note 26)		(6)			(6)	(6)
Partnership distributions (note 28)		(615)		(13)	(377)		(377)				(84)		(84)			(154)		(154)
Partnership preferred distributions (note 28)	[2]	(13)			(9)		(9)									(4)		(4)
Acquisition of subsidiaries (note 5)		1,241	1,241
Subsidiary distributions to non-controlling interest		(169)	(169)
Disposition of interests (note 11)		(24)	(24)
Preferred unit issuance (note 26)		186		186
Other items (note 26)		9	7		17		177	17	(177)				1	(1)		(15)		70	(15)	(70)
Balance as at Dec. 31, 2016		9,644	2,771	375	4,611	4,215	(483)	143	736		27	19	1	7		1,860	1,778	(215)	(34)	331
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		574	449		11		11				113		113			1		1
Other comprehensive income (loss)		323	140		128				128		(1)			(1)		56				56
Comprehensive income		897	589	0	139		11		128		112		113	(1)		57		1		56
Unit issuance (note 26)		992		220	692	692										300	300
Unit repurchases (note 26)						0
Partnership distributions (note 28)		(764)		(30)	(459)		(459)				(114)		(114)			(191)		(191)
Partnership preferred distributions (note 28)		(30)			(22)		(22)									(8)		(8)
Acquisition of subsidiaries (note 5)		3,523	3,523
Subsidiary distributions to non-controlling interest		(831)	(831)
Disposition of interests (note 11)		(177)	(177)
Preferred unit issuance (note 26)		220		220
Other items (note 26)		0			6			6								(6)			(6)
Balance as at Dec. 31, 2017		$ 13,474	$ 5,875	$ 595	$ 4,967	$ 4,907	$ (953)	$ 149	$ 864		$ 25	$ 19	$ 0	$ 6		$ 2,012	$ 2,078	$ (413)	$ (40)	$ 387
[1]	Refer to Note 27, Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.
[2]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)		Dec. 31, 2015USD ($)
Operating Activities
Net income	$ 574	$ 528	[1]	$ 391	[1]
Adjusted for the following items:
Earnings from investments in associates and joint ventures, net of distributions received	(52)	(202)		18
Depreciation and amortization expense	671	447		375
Mark-to-market on hedging items, provisions and other	90	(47)		(44)
Deferred income tax expense (recovery)	67	(18)		(26)
Changes in non-cash working capital, net	131	45		(82)
Cash from operating activities	1,481	753		632
Investing Activities
Acquisition of subsidiaries, net of cash acquired	(4,223)	(520)		(54)
Disposal of subsidiaries, net of cash disposed	0	353		28
Additions of investments in associates and joint ventures	(620)	(887)		(681)
Purchase of long lived assets	(714)	(690)		(520)
Disposal of long lived assets	47	7		10
Purchase of financial assets	(318)	(191)		(1,724)
Sale of financial assets and other	258	727		376
Net settlement of foreign exchange hedging items	(151)	143		219
Cash used by investing activities	(5,721)	(1,058)		(2,346)
Financing Activities
Distributions to general partner	(114)	(84)		(66)
Distributions to other unitholders	(680)	(544)		(480)
Subsidiary distributions to non-controlling interest	(831)	(169)		(91)
Capital provided by non-controlling interest	2,847	835		302
Capital provided to non-controlling interest	0	(51)		0
Proceeds from corporate borrowings	537	0		738
Repayment of corporate borrowings	(306)	0		0
Proceeds from corporate credit facility	2,403	2,316		823
Repayment of corporate credit facility	(1,614)	(2,723)		(662)
Proceeds from subsidiary borrowings	668	1,406		348
Repayment of subsidiary borrowings	(308)	(984)		(295)
Proceeds from other financing activities	0	0		131
Repayment of other financing activities	0	(38)		(38)
Preferred units issued	220	186		189
Partnership units issued, net of issuance costs	992	755		932
Partnership units repurchased	0	(6)		(67)
Cash from financing activities	3,814	899		1,764
Cash and cash equivalents
Change during the year	(426)	594		50
Impact of foreign exchange on cash	14	(7)		(32)
Cash reclassified as held for sale	0	0		(8)
Balance, beginning of year	786	199		189
Balance, end of year	$ 374	$ 786		$ 199
[1]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

ORGANIZATION AND DESCRIPTION OF

ORGANIZATION AND DESCRIPTION OF THE BUSINESS	12 Months Ended
	Dec. 31, 2017
Corporate Information And Statement Of IFRS Compliance [Abstract]
ORGANIZATION AND DESCRIPTION OF THE BUSINESS	ORGANIZATION AND DESCRIPTION OF THE BUSINESS Brookfield Infrastructure Partners L.P. (our “partnership” and, together with its subsidiaries and operating entities, “Brookfield Infrastructure”) owns and operates utility, transport, energy and communications infrastructure businesses in North and South America, Europe and the Asia Pacific region. Our partnership was formed as a limited partnership established under the laws of Bermuda, pursuant to a limited partnership agreement dated May 17, 2007, as amended and restated. Our partnership is a subsidiary of Brookfield Asset Management Inc. (“Brookfield”). Our partnership’s units are listed on the New York Stock Exchange and the Toronto Stock Exchange under the symbols “BIP” and “BIP.UN”, respectively. Our cumulative Class A preferred limited partnership units, Series 1, Series 3, Series 5, Series 7 and Series 9 are listed on the Toronto Stock Exchange under the symbols “BIP.PR.A”, “BIP.PR.B”, “BIP.PR.C”, “BIP.PR.D” and “BIP.PR.E”, respectively. Our partnership’s registered office is 73 Front Street, Hamilton, HM12, Bermuda. In these notes to the consolidated financial statements, references to “units” are to the limited partnership units in our partnership other than the preferred units, references to our “preferred units” are to preferred limited partnership units in our partnership and references to our “unitholders” and “preferred unitholders” are to the holders of our units and preferred units, respectively. References to “Class A Preferred Units”, “Series 1 Preferred Units”, “Series 3 Preferred Units”, “Series 5 Preferred Units”, “Series 7 Preferred Units” and “Series 9 Preferred Units” are to cumulative Class A preferred limited partnership units, cumulative Class A preferred limited partnership units, Series 1, cumulative Class A preferred limited partnership units, Series 3, cumulative Class A preferred limited partnership units, Series 5, cumulative Class A preferred limited partnership units, Series 7, and cumulative Class A preferred limited partnership units, Series 9 in our partnership, respectively. On September 14, 2016, we completed a three-for-two split of our units by way of a subdivision of units (the “Unit Split”), whereby unitholders received an additional one-half of a unit for each unit held, resulting in the issuance of an approximately 115 million additional units. Our preferred units were not affected by the Unit Split. All historical per unit disclosures have been adjusted to effect for the change in units due to the Unit Split.

SUBSIDIARIES

SUBSIDIARIES	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
SUBSIDIARIES	SUBSIDIARIES The following provides information about our partnership’s wholly-owned subsidiaries as of December 31, 2017 and 2016 : Ownership interest (%) Country of incorporation Defined Name Name of entity 2017 2016 Transport Australian rail operation Arc Infrastructure Holdings No. 1 Pty Ltd Australia 100 100 Energy Australian energy distribution operation Tas Gas Networks Pty Ltd Australia 100 100 The following table presents details of non-wholly owned subsidiaries of our partnership: Ownership Interest (%) Voting interest (%) Country of incorporation Defined Name Name of entity 2017 2016 2017 2016 Utilities U.K. regulated distribution operation BUUK Infrastructure Holdings Limited U.K. 80 80 80 80 Australian regulated terminal operation DBCT Management Pty Ltd (1) Australia 71 71 100 100 Colombian regulated distribution operation Empresa de Energia de Boyaca S.A. (1) Colombia 17 17 100 100 Brazilian regulated gas transmission operation Nova Transportadora do Sudeste (1),(2) Brazil 28 — 90 — Transport U.K. ports operation Brookfield Port Acquisitions (UK) Limited (1) U.K. 59 59 100 100 Australian ports operation Linx Cargo Care Group Pty Ltd (1),(3) Australia 27 27 67 67 Chilean toll roads Sociedad Concesionaria Vespucio Norte Express S.A. (1) Chile 51 51 89 89 Indian toll roads BIF India Holdings Pte Ltd (1),(4) Singapore 40 40 93 93 Peruvian toll roads Rutas de Lima S.A.C (1),(5) Peru 17 17 57 57 Energy North American gas storage operation (6) Warwick Gas Storage L.P. (1) Canada 25 25 100 100 Canadian district energy operation Enwave Energy Corporation (1) Canada 25 25 100 100 U.S. district energy operation Enwave USA (1) U.S. 40 40 100 100 North American gas storage operation (6) Lodi Gas Storage (1) U.S. 40 40 100 100 North American gas storage operation (6) Rockpoint Gas Storage Partners (1),(7) U.S. 40 40 100 100 Corporate & Other Holding LP Brookfield Infrastructure L.P. Bermuda 70 70 100 100 (1) For the above noted subsidiaries, our partnership has entered into voting arrangements to provide our partnership with the ability to direct the relevant activities of the investee. Our partnership controls these investees given that our partnership is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Our partnership exercises judgment to determine the level of variability that will achieve control over an investee, particularly in circumstances where our partnership’s voting interest differs from its ownership interest in an investee. The following were considered to determine whether our partnership controls these investees: the degree of power (if any) held by other investors, the degree of exposure to variability of each investor, the determination of whether any general partner removal rights are substantive and the purpose and design of the investee. (2) In April 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund (the “consortium”), acquired an effective 28% interest in Nova Transportadora do Sudeste S.A. (“NTS”), a Brazilian regulated gas transmission business, for total consideration of $1.6 billion . (3) In August 2016, Brookfield Infrastructure expanded its ports business to Australia as it acquired a 27% interest in Linx Cargo Care Group Pty Ltd through a Brookfield-sponsored infrastructure fund, along with institutional partners (the “Brookfield Consortium”) for total consideration of $145 million . (4) In March 2016 , Brookfield Infrastructure acquired a 40% interest in a toll road business in India from Gammon Infrastructure Projects Limited for consideration of $42 million through a Brookfield-sponsored infrastructure fund. (5) In June 2016 , Brookfield Infrastructure acquired a 17% interest in Rutas de Lima S.A.C. for total consideration of $127 million through a Brookfield-sponsored infrastructure fund. (6) North American gas storage operations include Warwick Gas Storage L.P., Lodi Gas Storage and Rockpoint Gas Storage Partners L.P. (7) In July 2016, Brookfield Infrastructure acquired a 40% interest in Rockpoint Gas Storage Partners L.P. for consideration of $227 million through a Brookfield-sponsored infrastructure fund. NON-WHOLLY OWNED SUBSIDIARIES The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Financial Position: As of December 31, 2017 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 107 $ 3,550 $ 281 $ 2,261 $ 217 $ 898 Australian regulated terminal 38 2,229 34 2,035 62 136 Colombian regulated distribution 68 764 26 438 302 66 Brazilian regulated gas transmission operation 322 5,990 73 2,015 3,081 1,143 Transport U.K. port operation 44 880 133 353 179 259 Australian port operation 163 628 101 218 346 126 Chilean toll roads 84 1,116 59 989 75 77 Peruvian toll roads 101 1,356 18 674 644 121 Indian toll roads 58 256 30 185 60 39 Energy North American gas storage operation 206 1,259 244 409 502 310 Canadian district energy operation 75 699 55 394 243 82 U.S. district energy operation 37 799 19 668 78 71 Corporate & Other Holding LP and other 127 244 392 2,060 84 (2,165 ) Total $ 1,430 $ 19,770 $ 1,465 $ 12,699 $ 5,873 $ 1,163 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. As of December 31, 2016 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 65 $ 2,985 $ 154 $ 1,919 $ 183 $ 794 Australian regulated terminal 27 2,162 (9 ) 1,926 70 202 Colombian regulated distribution 55 701 27 369 294 66 Transport U.K. port operation 42 754 108 324 150 214 Australian port operation 142 587 94 205 315 115 Chilean toll roads 102 1,069 50 941 89 91 Brazilian toll roads 42 466 27 — 189 292 Peruvian toll roads 127 1,261 27 635 610 116 Indian toll roads 52 264 36 186 58 36 Energy North American gas storage 199 1,141 136 478 452 274 Canadian district energy operation 15 570 13 290 209 73 U.S. district energy operation 43 697 62 537 73 68 Corporate & Other Holding LP and other 631 377 677 810 79 (558 ) Total $ 1,542 $ 13,034 $ 1,402 $ 8,620 $ 2,771 $ 1,783 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Operating Results: Year ended December 31, 2017 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 385 $ 21 $ 29 $ 114 $ 118 Australian regulated terminal operation 301 15 3 35 7 Colombian regulated distribution operation 161 12 38 2 7 Brazilian regulated gas transmission operation 938 349 (160 ) 146 (72 ) Transport U.K. port operation 180 8 21 22 29 Australian port operation 501 (7 ) 28 (3 ) 9 Chilean toll roads 154 — 7 — 8 Peruvian toll roads 103 12 22 2 5 Indian toll roads 57 (2 ) 4 (1 ) 3 Energy North American gas storage operation 149 30 74 18 47 Canadian district energy operation 95 (2 ) 39 — 13 U.S. district energy operation 131 10 40 7 26 Corporate & Other Holding LP and other 22 (3 ) 1 (349 ) (410 ) Total $ 3,177 $ 443 $ 146 $ (7 ) $ (210 ) Year ended December 31, 2016 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 347 $ 12 $ (14 ) $ 79 $ (55 ) Australian regulated terminal operation 299 15 (5 ) 46 (12 ) Colombian regulated distribution operation 150 10 45 2 10 Transport U.K. port operation 178 11 (37 ) 20 (52 ) Australian port operation 182 (18 ) (24 ) (7 ) (8 ) Chilean toll roads 127 (9 ) 7 (10 ) 8 Brazilian toll roads — 6 38 5 25 Peruvian toll roads 97 (8 ) (7 ) (2 ) (1 ) Indian toll roads 39 (3 ) 1 (3 ) — Energy North American gas storage operation 100 1 — 1 — Canadian district energy operation 79 (1 ) 31 1 11 U.S. district energy operation 111 (6 ) 31 — 20 Corporate & Other Holding LP and other 15 31 1 31 180 Total $ 1,724 $ 41 $ 67 $ 163 $ 126 Year ended December 31, 2015 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 339 $ 21 $ 25 $ 122 $ 101 Australian regulated terminal operation 330 15 (4 ) 68 (9 ) Colombian regulated distribution operation 152 13 (26 ) 16 (9 ) Transport U.K. port operation 220 7 13 22 18 Chilean toll roads 113 (7 ) (20 ) (15 ) (21 ) Energy North American gas storage operation 20 (8 ) 5 (12 ) 1 Canadian district energy operation 80 — 6 — 2 U.S. district energy operation 114 (6 ) 8 (3 ) 5 Corporate & Other Holding LP and other 21 55 (90 ) 5 (32 ) Total $ 1,389 $ 90 $ (83 ) $ 203 $ 56 The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Cash Flows: Cash Flow Activities Year ended December 31, 2017 Year ended December 31, 2016 US$ MILLIONS Operating Investing Financing Operating Investing Financing Utilities U.K. regulated distribution operation $ 220 $ (343 ) $ 129 $ 244 $ (487 ) $ 245 Australian regulated terminal operation 96 (9 ) (87 ) 128 (22 ) (106 ) Colombian regulated distribution operation 7 (22 ) 26 17 (18 ) — Brazilian regulated gas transmission operation 819 83 (839 ) — — — Transport U.K. port operation 46 (40 ) (10 ) 33 (24 ) (14 ) Australian port operation 37 (39 ) 12 7 (99 ) 154 Chilean toll roads 56 (5 ) (88 ) 63 (1 ) (99 ) Brazilian toll roads — — — 2 (70 ) 70 Peruvian toll roads 46 (67 ) — 29 25 1 Indian toll roads 30 (7 ) (22 ) (7 ) 28 (10 ) Energy North American gas storage operation 55 (9 ) (76 ) (12 ) 6 46 Canadian district energy operation 26 (82 ) 102 27 (18 ) (13 ) U.S. district energy operation 24 8 (28 ) 26 (33 ) 9 Corporate & Other Holding LP and other (98 ) (5,089 ) 4,721 124 (282 ) 618 Total $ 1,364 $ (5,621 ) $ 3,840 $ 681 $ (995 ) $ 901 Cash Flow Activities Year ended December 31, 2015 US$ MILLIONS Operating Investing Financing Utilities U.K. regulated distribution operation $ 164 $ (242 ) $ 92 Australian regulated terminal operation 103 (37 ) (67 ) New England electricity transmission operation 2 — (2 ) Colombian regulated distribution operation 16 (6 ) (7 ) Transport U.K. port operation 19 (66 ) 61 Australian port operation — — — Chilean toll roads 70 — (38 ) Energy North American gas storage operation (3 ) (1 ) 1 Canadian district energy operation 22 (16 ) (23 ) U.S. district energy operation 21 (13 ) (7 ) Corporate & Other Holding LP and other 92 (650 ) 554 Total $ 506 $ (1,031 ) $ 564

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2017
Corporate Information And Statement Of IFRS Compliance [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES (a) Statement of Compliance T hese consolidated financial statements have been prepared in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board (“IFRS”). The consolidated financial statements were authorized for issue by the Board of Directors on March 13, 2018 . (b) Basis of Preparation The consolidated financial statements are prepared on a going concern basis. Standards and guidelines not yet effective for the current accounting period are described in Note 3 (s), Future Changes in Accounting Policies. (i) Subsidiaries These consolidated financial statements include the accounts of our partnership and subsidiaries over which our partnership has control. Subsidiaries are consolidated from the date of acquisition, being the date on which our partnership obtains control, and continue to be consolidated until the date when control is lost. Our partnership (investor) controls an investee when it is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Together, our partnership and its subsidiaries are referred to as “Brookfield Infrastructure” in these financial statements. Non-controlling interests may be initially measured either at fair value or at the non-controlling interests’ proportionate share of the fair value of the acquiree’s identifiable net assets. The choice of measurement basis is made on an acquisition by acquisition basis. Subsequent to acquisition, the carrying amount of non-controlling interests is the amount of those interests at initial recognition plus the non-controlling interests’ share of subsequent changes in partnership capital in addition to changes in ownership interests. Total comprehensive income is attributed to non-controlling interests, even if this results in the non-controlling interests having a deficit balance. Holding LP has issued Redeemable Partnership Units held by Brookfield, which may, at the request of the holder, require the Holding LP to redeem the Redeemable Partnership Units for cash consideration equal to the market price of our partnership’s units. This right is subject to our partnership’s right of first refusal which entitles it, at its sole discretion, to elect to acquire any Redeemable Partnership Unit so presented to Holding LP in exchange for one of our partnership’s units subject to certain customary adjustments. All intercompany balances, transactions, revenues and expenses are eliminated in full. (ii) Associates and Joint Ventures Associates and joint ventures are entities over which our partnership has significant influence or joint control. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not constitute control. Our partnership accounts for investments over which it has significant influence using the equity method, and are recorded as Investments in associates and joint ventures on the Consolidated Statements of Financial Position. Interests in investments accounted for using the equity method are initially recorded at cost. If the cost of the associate is lower than the proportionate share of the investment’s underlying fair value, our partnership records a gain on the difference between the cost and the underlying fair values of the identifiable net assets of the associate. If the cost of the associate is greater than our partnership’s proportionate share of the underlying fair value, goodwill and other adjustments arising from the purchase price allocation relating to the associate is included in the carrying amount of the investment. Subsequent to initial recognition, the carrying value of our partnership’s interest in an investee is adjusted for our partnership’s share of comprehensive income or loss and distributions from the investee. Profits or losses resulting from transactions with an associate are recognized in the consolidated financial statements based on the interests of unrelated investors in the associate. (c) Foreign Currency Translation The U.S dollar is the functional and presentation currency of Brookfield Infrastructure. Each of Brookfield Infrastructure’s subsidiaries, associates and jointly controlled entities determines its own functional currency and items included in the financial statements of each subsidiary and associate are measured using that functional currency. Assets and liabilities of foreign operations having a functional currency other than the U.S. dollar are translated at the rate of exchange prevailing at the reporting date and revenues and expenses at average rates during the period. Gains or losses on translation are included as a component of other comprehensive income. On disposal of a foreign operation resulting in the loss of control, the component of other comprehensive income due to accumulated foreign currency translation relating to that foreign operation is reclassified to net income. Gains or losses on foreign currency denominated balances and transactions that are designated as hedges of net investments in these operations are reported in the same manner. On partial disposal of a foreign operation in which control is retained, the proportionate share of the component of other comprehensive income or loss relating to that foreign operation is reclassified to non-controlling interests in that foreign operation. Foreign currency denominated monetary assets and liabilities are translated using the rate of exchange prevailing at the reporting date and non-monetary assets and liabilities measured at fair value are translated at the rate of exchange prevailing at the date when the fair value was determined. Revenues and expenses are measured at average rates during the period. Gains or losses on translation of these items are included in net income. Gains and losses on transactions which hedge these items are also included in net income or loss. Foreign currency denominated non-monetary assets and liabilities, measured at historic cost, are translated at the rate of exchange at the transaction date. (d) Business Combinations Business acquisitions in which control is acquired are accounted for using the acquisition method, other than those between and among entities under common control. The consideration of each acquisition is measured at the aggregate of the fair values at the acquisition date of assets transferred by the acquirer, liabilities incurred or assumed, and equity instruments issued by Brookfield Infrastructure in exchange for control of the acquiree. Acquisition related costs are recognized in the Consolidated Statement of Operating Results as incurred and included in other expenses. Where applicable, the consideration for the acquisition includes any asset or liability resulting from a contingent consideration arrangement, measured at its acquisition-date fair value. Subsequent changes in fair values are adjusted against the cost of the acquisition where they qualify as measurement period adjustments. All other subsequent changes in the fair value of contingent consideration classified as liabilities will be recognized in the Consolidated Statements of Operating Results, whereas changes in the fair values of contingent consideration classified within partnership capital are not subsequently re-measured. Where a business combination is achieved in stages, Brookfield Infrastructure’s previously held interests in the acquired entity are remeasured to fair value at the acquisition date, that is, the date Brookfield Infrastructure attains control and the resulting gain or loss, if any, is recognized in the Consolidated Statements of Operating Results. Amounts arising from interests in the acquiree prior to the acquisition date that have previously been recognized in other comprehensive income are reclassified to the Consolidated Statements of Operating Results, where such treatment would be appropriate if that interest were disposed of. If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, Brookfield Infrastructure reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period, or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the amounts recognized as of that date. The measurement period is the period from the date of acquisition to the date Brookfield Infrastructure obtains complete information about facts and circumstances that existed as of the acquisition date. The measurement period is subject to a maximum of one year subsequent to the acquisition date. If, after reassessment, Brookfield Infrastructure’s interest in the fair value of the acquiree’s identifiable net assets exceeds the sum of the consideration transferred, the amount of any non-controlling interests in the acquiree and the fair value of the acquirer’s previously held equity interest in the acquiree if any, the excess is recognized immediately in profit or loss as a bargain purchase gain. Contingent liabilities acquired in a business combination are initially measured at fair value at the date of acquisition. At the end of subsequent reporting periods, such contingent liabilities are measured at the higher of the amount that would be recognized in accordance with IAS 37, Provisions, Contingent Liabilities and Contingent Assets (“IAS 37”) and the amount initially recognized less cumulative amortization recognized in accordance with IAS 18, Revenue (“IAS 18”). (e) Cash and Cash Equivalents Cash and cash equivalents include cash on hand and short-term investments with original maturities of three months or less. (f) Accounts Receivable Trade receivables are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less any allowance for uncollectability. (g) Property, Plant and Equipment Brookfield Infrastructure uses the revaluation method of accounting for all classes of property, plant and equipment. Property, plant and equipment is initially measured at cost and subsequently carried at its revalued amount, being the fair value at the date of the revaluation less any subsequent accumulated depreciation and any accumulated impairment losses. Revaluations are made on at least an annual basis, and on a sufficient basis to ensure that the carrying amount does not differ significantly from fair value. Where the carrying amount of an asset is increased as a result of a revaluation, the increase is recognized in other comprehensive income or loss and accumulated in equity within the revaluation surplus reserve, unless the increase reverses a previously recognized impairment recorded through net income, in which case that portion of the increase is recognized in net income. Where the carrying amount of an asset is decreased, the decrease is recognized in other comprehensive income to the extent of any balance existing in revaluation surplus in respect of the asset, with the remainder of the decrease recognized in net income. Revaluation gains are included in other comprehensive income, but are not subsequently recycled into profit or loss. An item of property, plant and equipment and any significant part initially recognized is derecognized upon disposal or when no future economic benefits are expected from its use or disposal. The gain or loss arising on disposal or retirement of an item of property, plant and equipment is determined as the difference between the sales proceeds and the carrying amount of the asset and is recognized in the Consolidated Statements of Operating Results. However, any balance accumulated in revaluation surplus is subsequently recorded in retained earnings when an asset is derecognized and not transferred to profit or loss. Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows: Buildings Up to 70 years Transmission stations, towers and related fixtures Up to 40 years Leasehold improvements Up to 50 years Plant and equipment Up to 40 years Network systems Up to 60 years Track Up to 40 years District energy systems Up to 50 years Gas storage assets Up to 50 years Depreciation on property, plant and equipment is calculated on a straight-line or declining-balance basis so as to depreciate the net cost of each asset over its expected useful life to its estimated residual value. Leasehold improvements are depreciated over the period of the lease or estimated useful life, whichever is the shorter, using the straight-line method. The estimated useful lives, residual values and depreciation methods are reviewed at the end of each annual reporting period, with the effect of any changes recognized on a prospective basis. (h) Investment Property Brookfield Infrastructure uses the fair value method to account for assets classified as investment property. An asset is determined to be an investment property when it is principally held to earn rental income or for capital appreciation, or both. Investment property is initially measured at cost including transaction costs. Subsequent to initial recognition, investment properties are carried at fair value. Gains or losses arising from changes in fair value are included in profit or loss. Fair values are primarily determined by valuation of the lease term and freehold reversion. An income capitalization approach is used by applying a yield to the rental income of the capitalization rate is reflective of the characteristics, location and market of each property. Fair value is estimated by management of our partnership with due consideration given to observable market inputs, where available. (i) Asset Impairment At each reporting date Brookfield Infrastructure assesses whether for assets, other than those measured at fair value with changes in values recorded in profit or loss, there is any indication that such assets are impaired. This assessment includes a review of internal and external factors which includes, but is not limited to, changes in the technological, political, economic or legal environment in which the entity operates in, structural changes in the industry, changes in the level of demand, physical damage and obsolescence due to technological changes. An impairment is recognized if the recoverable amount, determined as the higher of the estimated fair value less costs of disposal or the discounted future cash flows generated from use and eventual disposal from an asset or cash generating unit is less than its carrying value. The projections of future cash flows take into account the relevant operating plans and management’s best estimate of the most probable set of conditions anticipated to prevail. Where an impairment loss subsequently reverses, the carrying amount of the asset or cash generating unit is increased to the lesser of the revised estimate of recoverable amount and the carrying amount that would have been recorded had no impairment loss been recognized previously. (j) Intangible Assets Intangible assets acquired in a business combination and recognized separately from goodwill are initially recognized at their fair value at the acquisition date. Brookfield Infrastructure’s intangible assets are comprised primarily of conservancy rights, service concession arrangements and customer order backlogs. Subsequent to initial recognition, intangible assets acquired in a business combination are reported at cost less accumulated amortization unless indefinite-lived and accumulated impairment losses, on the same basis as intangible assets acquired separately. Public service concessions that provide Brookfield Infrastructure the right to charge users for a service in which the service and fee is regulated by the grantor are accounted for as an intangible asset under IFRIC 12, Service Concession Arrangements . Concession arrangements were acquired as part of the acquisition of the Australian regulated terminal operation, Brazilian regulated gas transmission, and Chilean, Indian and Peruvian toll roads and were initially recognized at their fair values. The intangible asset at the Australian regulated terminal operation relates to use of a specific coal port terminal for a contractual length of time and is amortized over the life of the contractual arrangement with 83 years remaining on a straight-line basis. The intangible assets at the Brazilian regulated gas transmission operation relate to pipeline concession contracts, amortized on a straight-line basis over the life of the contractual arrangement. The intangible assets at the Chilean, Indian and Peruvian toll roads relate to the right to operate a road and charge users a specified tariff for a contractual length of time and is amortized over the life of the contractual arrangement with an average of 16 , 6 , and 25 years remaining, respectively. The conservancy right was acquired as part of the acquisition of the U.K. port operation and was recorded at its fair value. As a right in perpetuity issued by the Statutory Harbour Authority in the U.K., the conservancy right is classified as having an indefinite life and is subject to an annual impairment assessment. The customer order backlog was acquired as part of the acquisition of the U.K. regulated distribution operation and was initially recorded at its fair value. The customer order backlog represents the present value of future earnings derived from the build out of contracted connections at the acquisition date of the U.K. regulated distribution operation. The customer order backlog is amortized over its estimated useful life of 15 years. Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset and are recognized in profit or loss when the asset is derecognized. (k) Goodwill Goodwill represents the excess of the price paid for the acquisition of an entity over the fair value of the net tangible and intangible assets and liabilities acquired. Goodwill is allocated to the cash generating unit or units to which it relates. Brookfield Infrastructure identifies cash generating units as identifiable groups of assets that are largely independent of the cash inflows from other assets or groups of assets. Goodwill is evaluated for impairment annually or more often if events or circumstances indicate there may be impairment. Impairment is determined for goodwill by assessing if the carrying value of a cash generating unit, including the allocated goodwill, exceeds its recoverable amount determined as the greater of the estimated fair value less costs of disposal or the value in use. Impairment losses recognized in respect of a cash generating unit are first allocated to the carrying value of goodwill and any excess is allocated to the carrying amount of assets in the cash generating unit. Any goodwill impairment is charged to profit or loss in the period in which the impairment is identified. Impairment losses on goodwill are not subsequently reversed. On disposal of a subsidiary, the attributable amount of goodwill is included in the determination of the gain or loss on disposal of the operation. (l) Revenue Recognition Revenue is recognized to the extent that it is probable that the economic benefits will flow to Brookfield Infrastructure and the revenue and costs incurred or to be incurred can be reliably measured. Revenue is measured at the fair value of the consideration received or receivable. Amounts disclosed as revenue are net of estimated customer returns, trade allowances, rebates and other similar allowances. When our partnership receives a transfer of cash or property, plant and equipment from a customer, it assesses whether the constructed or acquired item of property, plant and equipment meets the definition of an asset in accordance with IFRIC 18, Transfer of Assets from Customers (“IFRIC 18”). If the definition of an asset is met, our partnership recognizes the item of property, plant and equipment at its cost and recognizes revenue or deferred revenue, as applicable, for the same amount based on the appropriate revenue recognition policy. Brookfield Infrastructure recognizes revenue when the specific criteria have also been met for each of Brookfield Infrastructure’s activities as described below. Cash received by Brookfield Infrastructure from customers is recorded as deferred revenue until revenue recognition criteria are met. Utilities Revenue from utilities infrastructure is derived from the transmission of energy and natural gas, the distribution of energy and from Brookfield Infrastructure’s Australian regulated terminal operation. Distribution and transmission revenue is recognized when services are rendered based upon usage or volume during that period. Terminal infrastructure charges are charged at set rates per tonne of coal based on each customer’s annual contracted tonnage and is then recognized on a pro-rata basis each month. Brookfield Infrastructure’s Australian regulated terminal operation also recognizes handling charges based on tonnes of coal shipped through the terminal. Brookfield Infrastructure’s regulated distribution operation receives customer contributions which are recorded in deferred revenue and released on a percentage of completion basis in accordance with IFRIC 18 and IAS 11. Transport Revenue from transport infrastructure consists primarily of freight, toll road operations and transportation services revenue. Revenue is recognized when services are provided and rendered based primarily on usage or volume throughput during the period. Energy Revenue from energy infrastructure consists primarily of energy transmission and storage as well as district energy services. Revenue is recognized when services are provided and rendered based primarily on usage or volume throughput during the period. Communications Infrastructure Revenue from communications infrastructure is derived from contracts with media broadcasting and telecom customers to access infrastructure. Customers pay upfront and recurring fees to lease space on towers to host their equipment. Recurring rental revenue is recognized on a straight line basis based on lease agreements. Upfront payments which are separable from the recurring revenue under IFRIC 18 are recognized on a percentage of completion basis on the construction asset they relate to. (m) Financial Instruments and Hedge Accounting The following summarizes Brookfield Infrastructure’s classification and measurement of financial assets and liabilities: Classification Measurement Financial assets Cash and cash equivalents Loans and receivables Amortized cost Accounts receivable and other Loans and receivables Amortized cost Restricted cash and deposits Loans and receivables Amortized cost Marketable securities Available-for-sale Fair value Financial assets Derivative assets FVTPL (1) Fair value Other financial assets Loans and receivables/ Available-for-sale Amortized cost/ Fair value Financial liabilities Corporate borrowings Other liabilities Amortized cost Non-recourse borrowings Other liabilities Amortized cost (2) Accounts payable and other Other liabilities Amortized cost Preferred shares Other liabilities Amortized cost Financial liabilities FVTPL (1) Fair value (1) Fair value through profit or loss (“FVTPL”), except for derivatives in certain hedge relationships. (2) Except for derivatives embedded in the related financial instruments that are classified as FVTPL and measured at fair value. Our partnership maintains a portfolio of marketable securities comprised of liquid equity and debt securities. The marketable securities are classified as available-for-sale and are subsequently measured at fair value at each reporting date with the change in fair value recorded in other comprehensive income. When a decline in the fair value of an available-for-sale financial asset has been recognized in other comprehensive income and there is objective evidence that the asset is impaired, the cumulative loss that had been recognized in other comprehensive income is reclassified from equity to profit or loss as a reclassification adjustment. Brookfield Infrastructure selectively utilizes derivative financial instruments primarily to manage financial risks, including interest rate and foreign exchange risks. Derivative financial instruments are recorded at fair value. Hedge accounting is applied when the derivative is designated as a hedge of a specific exposure and there is assurance that it will continue to be highly effective as a hedge based on an expectation of offsetting cash flows or fair value. Hedge accounting is discontinued prospectively when the derivative no longer qualifies as a hedge or the hedging relationship is terminated. Once discontinued, the cumulative change in fair value of a derivative that was previously recorded in other comprehensive income by the application of hedge accounting is recognized in profit or loss over the remaining term of the original hedging relationship as amounts related to the hedged item are recognized in profit or loss. The assets or liabilities relating to unrealized mark-to-market gains and losses on derivative financial instruments are recorded in Financial Assets and Financial Liabilities, respectively. (i) Items Classified as Hedges Realized and unrealized gains and losses on foreign exchange contracts, designated as hedges of currency risks relating to a net investment in a subsidiary with a functional currency other than the U.S. dollar are included in equity and are included in net income in the period in which the subsidiary is disposed of or to the extent partially disposed and control is not retained. Derivative financial instruments that are designated as hedges to offset corresponding changes in the fair value of assets and liabilities and cash flows are measured at estimated fair value with changes in fair value recorded in profit or loss or as a component of equity as applicable. Unrealized gains and losses on interest rate contracts designated as hedges of future variable interest payments are included in equity as a cash flow hedge when the interest rate risk relates to an anticipated variable interest payment. The periodic exchanges of payments on interest rate swap contracts designated as hedges of debt are recorded on an accrual basis as an adjustment to interest expense. The periodic exchanges of payments on interest rate contracts designated as hedges of future interest payments are amortized into profit or loss over the term of the corresponding interest payments. (ii) Items Not Classified as Hedges Derivative financial instruments that are not designated as hedges are carried at estimated fair value, and realized and unrealized gains and losses are recognized in net income in the period the gains and losses occur. Other financial assets are classified as loans and receivables or available-for-sale securities based on their nature and use within our partnership’s business and are recorded initially at fair value. Other financial assets classified as available-for-sale are subsequently measured at fair value at each reporting date with the change in fair value recorded in other comprehensive income. Other financial assets classified as loans and receivables are subsequently measured at amortized cost using the effective interest method, less any impairment. Assets classified as loans and receivables are impaired when there exists objective evidence that the financial asset is impaired. (n) Income Taxes Income tax expense represents the sum of the tax accrued in the period and deferred income tax. (i) Current income tax Current income tax assets and liabilities are measured at the amount expected to be paid to tax authorities, net of recoveries based on the tax rates and laws enacted or substantively enacted at the reporting date. Current income tax relating to items recognized directly in partnership capital are also recognized directly in partnership capital and other comprehensive income. (ii) Deferred income tax Deferred income tax liabilities are provided for using the liability method on temporary differences between the tax bases used in the computation of taxable income and carrying amounts of assets and liabilities in the consolidated financial statements. Deferred income tax assets are recognized for all deductible temporary differences, carry forward of unused tax credits and unused tax losses, to the extent that it is probable that deductions, tax credits and tax losses can be utilized. Such deferred income tax assets and liabilities are not recognized if the temporary difference arises from goodwill or from the initial recognition of other assets and liabilities in a transaction that affects neither the taxable income nor the accounting income, other than in a business combination. The carrying amount of deferred income tax assets are reviewed at each reporting date and reduced to the extent it is no longer probable that the income tax asset will be recovered. Deferred income tax liabilities are recognized for taxable temporary differences associated with investments in subsidiaries and associates, and interests in joint ventures, except where Brookfield Infrastructure is able to control the reversal of the temporary difference and it is probable that the temporary differences will not reverse in the foreseeable future. Deferred income tax assets arising from deductible temporary differences associated with such investments and interests are only recognized to the extent that it is probable that there will be sufficient taxable income against which to utilize the benefits of the temporary differences and they are expected to reverse in the foreseeable future. Deferred income tax assets and liabilities are measured at the tax rates that are expected to apply in the period in which the liability is settled or the asset realized, based on tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred income tax liabilities and assets reflect the tax consequences that would follow from the manner in which Brookfield Infrastructure expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred income tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax liabilities and when they relate to income taxes levied by the same taxation authority within a single taxable entity or Brookfield Infrastructure intends to settle its current tax assets and liabilities on a net basis in the case where there exist different taxable entities in the same taxation authority and when there is a legally enforceable right to set off current tax assets against current tax liabilities. (o) Assets Held for Sale Non-current assets and disposal groups are classified as held for sale if their carrying amount will be recovered principally through a sale transaction rather than through continuing use. This condition is regarded as met only when the sale is highly probable and the non-current asset or disposal group is available for immediate sale in its present condition. Management must be committed to the sale, which should be expected to qualify for recognition as a completed sale within one year from the date of classification subject to limited exceptions. When Brookfield Infrastructure is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether Brookfield Infrastructure will retain a non-controlling interest in its former subsidiary after the sale. Non-current assets and disposal groups classified as held for sale are measured at the lower of their previous carrying amount and fair value less costs to sell. Non-current assets classified as held for sale and the assets of a disposal group are presented separately from other assets in the Consolidated Statements of Financial Position and are classified as current. The liabilities of a disposal group classified as held for sale are pres

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2017
Operating Segments [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION IFRS 8, Operating Segments, requires operating segments to be determined based on information that is regularly reviewed by the Executive Management and the Board of Directors for the purpose of allocating resources to the segment and to assessing its performance. Key measures used by the Chief Operating Decision Maker (“CODM”) in assessing performance and in making resource allocation decisions are funds from operations (“FFO”) and earnings before interest, tax, depreciation and amortization (“Adjusted EBITDA”), which enable the determination of return on the equity deployed. FFO is calculated as net income excluding the impact of depreciation and amortization, deferred income taxes, breakage and transaction costs, and non-cash valuation gains or losses. Adjusted EBITDA is calculated as net income excluding the impact of depreciation and amortization, interest expense, current and deferred income taxes, breakage and transaction costs, and non-cash valuation gains or losses. FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 988 $ 1,589 $ 559 $ 165 $ — $ 3,301 $ (1,624 ) $ 1,858 $ 3,535 Costs attributed to revenues (250 ) (895 ) (278 ) (75 ) — (1,498 ) 861 (872 ) (1,509 ) General and administrative costs — — — — (239 ) (239 ) — — (239 ) Adjusted EBITDA 738 694 281 90 (239 ) 1,564 (763 ) 986 Other (expense) income (14 ) (4 ) 15 (2 ) 45 40 7 (108 ) (61 ) Interest expense (114 ) (158 ) (87 ) (12 ) (63 ) (434 ) 172 (166 ) (428 ) FFO 610 532 209 76 (257 ) 1,170 (584 ) 712 Depreciation and amortization (186 ) (312 ) (151 ) (77 ) — (726 ) 382 (327 ) (671 ) Deferred taxes (52 ) (1 ) 11 21 14 (7 ) (22 ) (38 ) (67 ) Mark-to-market on hedging items and other (59 ) (80 ) (37 ) (9 ) (127 ) (312 ) 106 124 (82 ) Share of earnings from associates — — — — — — 118 — 118 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (471 ) (471 ) Net income (loss) attributable to partnership (2) $ 313 $ 139 $ 32 $ 11 $ (370 ) $ 125 $ — $ — $ 125 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 684 $ 1,247 $ 496 $ 163 $ — $ 2,590 $ (1,311 ) $ 836 $ 2,115 Costs attributed to revenues (160 ) (650 ) (220 ) (72 ) — (1,102 ) 651 (612 ) (1,063 ) General and administrative costs — — — — (166 ) (166 ) — — (166 ) Adjusted EBITDA 524 597 276 91 (166 ) 1,322 (660 ) 224 Other income (expense) 5 (17 ) 8 (2 ) 84 78 16 1 95 Interest expense (130 ) (157 ) (109 ) (12 ) (48 ) (456 ) 190 (126 ) (392 ) FFO 399 423 175 77 (130 ) 944 (454 ) 99 Depreciation and amortization (154 ) (253 ) (128 ) (74 ) — (609 ) 328 (166 ) (447 ) Deferred taxes 5 26 (38 ) 29 (17 ) 5 9 4 18 Mark-to-market on hedging items and other (88 ) 10 81 (5 ) 149 147 (131 ) 117 133 Share of earnings from associates — — — — — — 248 — 248 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (54 ) (54 ) Net income (loss) attributable to partnership (2) $ 162 $ 206 $ 90 $ 27 $ 2 $ 487 $ — $ — $ 487 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues 698 1,143 349 123 — 2,313 (1,044 ) 586 1,855 Costs attributed to revenues (174 ) (588 ) (183 ) (57 ) — (1,002 ) 546 (342 ) (798 ) General and administrative costs — — — — (134 ) (134 ) — — (134 ) Adjusted EBITDA 524 555 166 66 (134 ) 1,177 (498 ) 244 Other income (expense) 5 (15 ) 3 — 34 27 13 (4 ) 36 Interest expense (142 ) (142 ) (79 ) (6 ) (27 ) (396 ) 144 (115 ) (367 ) FFO 387 398 90 60 (127 ) 808 (341 ) 125 Depreciation and amortization (153 ) (217 ) (90 ) (46 ) — (506 ) 246 (115 ) (375 ) Deferred taxes (8 ) 21 14 14 12 53 (41 ) 14 26 Mark-to-market on hedging items and other (16 ) (67 ) (14 ) (13 ) 56 (54 ) 67 66 79 Share of earnings from associates — — — — — — 69 — 69 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (90 ) (90 ) Net income (loss) attributable to partnership (2) 210 135 — 15 (59 ) 301 — — 301 (1) The above table provides each segment’s results in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations accounted for using the consolidation and equity methods under IFRS. The above table reconciles Brookfield Infrastructure’s proportionate results to our partnership’s consolidated statements of operating results on a line by line basis by aggregating the components comprising the earnings from our partnership’s investments in associates and reflecting the portion of each line item attributable to non-controlling interests. (2) Net income (loss) attributable to our partnership includes net income (loss) attributable to non-controlling interests—Redeemable Partnership Units held by Brookfield, general partner and limited partners. Segment assets For the purpose of monitoring segment performance and allocating resources between segments, the CODM monitors the assets, including investments accounted for using the equity method, attributable to each segment. The following is an analysis of Brookfield Infrastructure’s assets by reportable operating segment for the years under review: Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 6,542 $ 6,990 $ 3,134 $ 1,049 $ (1,083 ) $ 16,632 $ (3,134 ) $ 11,668 $ 4,311 $ 29,477 Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 4,605 $ 6,160 $ 3,032 $ 933 $ (510 ) $ 14,220 $ (2,996 ) $ 6,496 $ 3,555 $ 21,275 (1) The above table provides each segment’s assets in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations using consolidation and the equity method whereby our partnership either controls or exercises significant influence over the investment respectively. The above table reconciles Brookfield Infrastructure’s proportionate assets to total assets presented on our partnership’s Consolidated Statements of Financial Position by removing net liabilities contained within investments in associates and joint ventures and reflecting the assets attributable to non-controlling interests, and adjusting for working capital assets which are netted against working capital liabilities. Geographic Information Revenues from external customers US$ MILLIONS 2017 2016 2015 Australia $ 1,093 $ 793 $ 699 Brazil 938 — — United Kingdom 565 566 635 Colombia 161 150 152 Canada 193 163 118 Chile 153 127 113 United States of America 183 154 138 India 57 39 — Peru 103 97 — New Zealand 89 26 — $ 3,535 $ 2,115 $ 1,855 Over 10% of our partnership’s revenue is from one customer. For the year ended December 31, 2017, revenue generated from this customer of the utilities segment was $938 million (2016: $ nil ). Non-current Assets US$ MILLIONS 2017 2016 Australia $ 5,770 $ 5,542 United Kingdom 4,431 3,739 Chile 2,045 1,748 Brazil 8,184 1,895 United States of America 2,818 2,470 Canada 1,468 1,252 Colombia 764 700 Europe 836 718 India 256 265 Peru 1,356 1,281 New Zealand 37 33 $ 27,965 $ 19,643

ACQUISITION OF BUSINESSES

ACQUISITION OF BUSINESSES	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about business combination [abstract]
ACQUISITION OF BUSINESSES	ACQUISITION OF BUSINESSES a) Acquisition of Brazilian regulated gas transmission business On April 4, 2017 , Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund (the “consortium”), acquired an effective 28% interest in Nova Transportadora do Sudeste S.A. (“NTS”), a Brazilian regulated gas transmission business, for total consideration by Brookfield Infrastructure of approximately $1.6 billion (consortium total of $5.1 billion ). Brookfield Infrastructure’s consideration consists of $1.3 billion in cash (consortium total of $4.2 billion ) and deferred consideration of $0.3 billion (consortium total of $0.9 billion ) payable five years from the close of the transaction. Concurrently, Brookfield Infrastructure entered into a voting agreement with an affiliate of Brookfield, providing Brookfield Infrastructure the right to direct the relevant activities of the entity, thereby providing Brookfield Infrastructure with control. Accordingly, Brookfield Infrastructure consolidated the entity effective April 4, 2017 . Acquisition costs of $8 million were recorded as Other expenses within the Consolidated Statements of Operating Results. Consideration transferred US$ MILLIONS Cash $ 1,306 Consideration payable (1) 262 Total Consideration $ 1,568 Fair value of assets and liabilities acquired as of April 4, 2017: US$ MILLIONS Cash and cash equivalents $ 89 Accounts receivable and other 317 Intangible assets (2) 5,515 Goodwill 804 Accounts payable and other liabilities (202 ) Deferred income tax liabilities (946 ) Net assets acquired before non-controlling interest 5,577 Non-controlling interest (3) (4,009 ) Net assets acquired 1,568 (1) The deferred consideration is payable on the fifth anniversary of the date of acquisition and has therefore been initially recorded at fair value within non-current financial liabilities on the consolidated statements of financial position. The deferred consideration is denominated in U.S. dollars and accrues interest at 3.35% compounded annually. The financial liability will be subsequently measured at amortized cost. (2) Represents authorizations that expire between 2039 and 2041. (3) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. Upon acquisition of an interest in NTS, an additional deferred tax liability of $893 million was recorded. The deferred income tax liability arose as the tax bases of the net assets acquired were lower than their fair values. The inclusion of this liability in the net book value of the acquired business, partially offset by the recognition of non-controlling interest at fair value, gave rise to goodwill of $804 million , which is recoverable so long as the tax circumstances that gave rise to the goodwill do not change. To date, no such changes have occurred. None of the goodwill recognized is deductible for income tax purposes. For the year ended December 31, 2017, the Brazilian regulated gas transmission business contributed revenues of $938 million and net income of $495 million . b) Individually insignificant business combinations The following table summarizes the purchase price allocation of individually insignificant business combinations that have been completed during the twelve -month periods ended December 31, 2017 . US$ MILLIONS Cash $ 9 Consideration payable 18 Total consideration $ 27 Fair value of assets and liabilities acquired (provisional): US$ MILLIONS Accounts receivable and other $ 28 Goodwill 11 Property, plant and equipment 100 Deferred income tax and other liabilities (31 ) Non-recourse borrowings (30 ) Net assets acquired before non-controlling interest 78 Non-controlling interest (1) (51 ) Net assets acquired $ 27 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. For the year ended December 31, 2017, the individually insignificant business combinations contributed revenues of $24 million and net income of $4 million . c) Acquisition of Australian ports business On August 18, 2016 , Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund, and Qube Holdings Limited, along with its respective institutional partners, acquired certain assets from Asciano Limited. As part of this transaction Brookfield Infrastructure tendered its 20% interest in Asciano acquired in the fourth quarter of 2015. As a result of tendering its interest in Asciano Limited, a gain of $123 million was recorded in Other income on the Consolidated Statements of Operating Results during the third quarter of 2016, representing the reclassification of available for sale mark-to-market gains of $44 million and foreign exchange gains of $79 million to net income from accumulated other comprehensive income. Concurrently, Brookfield Infrastructure acquired an effective 27% interest in Linx Cargo Care, alongside other members of the Brookfield Consortium, through a Brookfield-sponsored infrastructure fund for total consideration of $145 million , comprising of $13 million in cash and a portion of our partnership’s previously existing interest in shares of Asciano Limited with an acquisition date fair value of $132 million (Brookfield Consortium total consideration of $63 million cash and $442 million in fair value of shares, funded through our partnership). Concurrently, Brookfield Infrastructure entered into a voting agreement with an affiliate of Brookfield, providing Brookfield Infrastructure the right to direct the relevant activities of the entity, thereby providing Brookfield Infrastructure with control. Accordingly, Brookfield Infrastructure consolidated the entity effective August 18, 2016 . Acquisition costs of $17 million were recorded as Other expenses within the Consolidated Statements of Operating Results in 2016. Consideration transferred US$ MILLIONS Cash $ 13 Common shares of Asciano Limited 132 Total consideration $ 145 Fair value of assets and liabilities acquired as of August 18, 2016 US$ MILLIONS Cash and cash equivalents $ 12 Accounts receivable and other 233 Assets classified as held for sale (1) 115 Property, plant and equipment 225 Intangible assets 69 Goodwill 199 Liabilities directly associated with assets classified as held for sale (1) (58 ) Deferred income tax and other liabilities (109 ) Non-recourse borrowings (181 ) Net assets acquired before non-controlling interest 505 Non-controlling interest (2) (360 ) Net assets acquired $ 145 (1) $115 million of equity accounted investments and $58 million of non-recourse borrowings relate to a non-core business acquired as part of the acquisition of the Australian ports business which was sold in the fourth quarter of 2016. The net proceeds recorded approximated the carrying value of the business and therefore no gain or loss on disposition was recorded. (2) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. The additional goodwill recorded on acquisition primarily represents expected growth arising from the business’ position as an incumbent in a fragmented bulk port services industry. None of the goodwill recognized is expected to be deductible for income tax purposes. The recoverable amount of the goodwill has been determined based on the fair value less cost of disposal of the cash-generating unit using a discounted cash flow model whereby the fair value measurement is classified under level 3 on the fair value hierarchy. The key inputs in determining fair value under the discounted cash flow model are the utilization of a discount rate of 15% , a terminal value multiple of 8.9 x and a discrete cash flow period of 10 years. The carrying amount of the cash-generating unit was determined to not exceed its recoverable amount. d) Acquisition of North American gas storage business On July 19, 2016 , Brookfield Infrastructure expanded its gas storage business as it acquired an effective 40% interest in Rockpoint Gas Storage (“Rockpoint”) for consideration of $227 million through a Brookfield-sponsored infrastructure fund. The consideration is comprised of $141 million of Rockpoint senior notes currently owned by Brookfield Infrastructure, $19 million of a working capital credit facility provided to Rockpoint by Brookfield Infrastructure prior to the acquisition date, and cash of $67 million (1) . Concurrently, Brookfield Infrastructure entered into a voting agreement with an affiliate of Brookfield, providing Brookfield Infrastructure the right to direct the relevant activities of the entity, thereby providing Brookfield Infrastructure with control. Accordingly, Brookfield Infrastructure consolidated the entity effective July 19, 2016 . Acquisition costs of $11 million were recorded as Other expenses within the Consolidated Statement of Operating Results in 2016. Consideration transferred US$ MILLIONS Cash $ 67 Senior notes (2) 141 Working capital credit facility 19 Total consideration $ 227 (1) The total consideration through the Brookfield-sponsored partnership includes $170 million cash, $357 million in fair value of the Senior notes and $48 million of a working capital facility. (2) On the date of acquisition of the North American gas storage operation Brookfield Infrastructure held a pre-existing interest in the Senior notes of $117 million , representing the original cost of $104 million and $13 million of income recorded as Other income on the Consolidated Statement of Operating Results in prior periods. On the acquisition date, Brookfield Infrastructure recorded an additional $24 million of Other income on the Consolidated Statement of Operating Results associated with the recycling of accumulated mark-to-market gains on revaluation of the Senior notes, which was equivalent to fair value. Fair value of assets and liabilities acquired as of July 19, 2016 US$ MILLIONS Cash and cash equivalents $ 15 Accounts receivable and other 99 Inventory 39 Property, plant and equipment 825 Goodwill 82 Deferred income tax and other liabilities (148 ) Non-recourse borrowings (337 ) Net assets acquired before non-controlling interest 575 Non-controlling interest (1) (348 ) Net assets acquired $ 227 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure and was measured at fair value on the acquisition date. Upon acquisition of the North American gas storage business by Brookfield Infrastructure, a deferred tax liability of $82 million was recorded. The deferred income tax liability arose because tax bases of the net assets acquired were lower than their fair values. The inclusion of this liability in the net book value of the acquired business gave rise to goodwill of $82 million , which is recoverable so long as the tax circumstances that gave rise to the goodwill do not change. To date, no such changes have occurred. None of the goodwill recognized is deductible for income tax purposes. e) Acquisition of Peruvian toll road business On June 28, 2016 , Brookfield Infrastructure expanded its toll road business to Peru as it acquired an effective 17% interest in Rutas de Lima S.A.C. (“Rutas”), through a Brookfield-sponsored infrastructure fund, for total consideration of $127 million , comprised of $118 million of cash (fund total of $400 million funded through our partnership) and an amount payable of $9 million (fund total of $30 million ). Concurrently, Brookfield Infrastructure entered into a voting agreement with an affiliate of Brookfield, providing Brookfield Infrastructure the right to direct the relevant activities of the entity, thereby providing Brookfield Infrastructure with control. Accordingly, Brookfield Infrastructure consolidated the entity effective June 28, 2016 . Acquisition costs of less than $1 million were recorded as Other expenses within the Consolidated Statement of Operating Results in 2016. Consideration transferred US$ MILLIONS Cash $ 118 Consideration payable (1) 9 Total consideration $ 127 Fair value of assets and liabilities acquired as of June 28, 2016 US$ MILLIONS Cash and cash equivalents (2) $ 115 Accounts receivable and other 121 Property, plant and equipment 6 Intangible assets (3) 973 Goodwill 139 Deferred income tax and other liabilities (160 ) Non-recourse borrowings (441 ) Net assets acquired before non-controlling interest 753 Non-controlling interest (4) (626 ) Net assets acquired $ 127 (1) The purchase price is payable in a series of four payments, one on the date of acquisition as well as three equal payments made 18 months, 27 months and 36 months subsequent to this date and consequently an amount payable of $9 million is recorded as a financial liability within the consolidated statements of financial position as at December 31, 2016. (2) Includes $114 million of restricted cash primarily related to toll road construction obligations. (3) Represents a 30 year Peruvian toll road service concession agreement expiring in January 2043. The agreement obligates Rutas to maintain the toll roads to an acceptable standard in exchange for the ability to charge regulated tariffs to the users of the toll road. (4) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. Upon acquisition of the Peruvian toll road business by Brookfield Infrastructure, a deferred tax liability of $139 million was recorded. The deferred income tax liability arose because tax bases of the net assets acquired were lower than their fair values. The inclusion of this liability in the net book value of the acquired business gave rise to goodwill of $139 million , which is recoverable so long as the tax circumstances that gave rise to the goodwill do not change. To date, no such changes have occurred. None of the goodwill recognized is deductible for income tax purposes. f) Acquisition of Indian toll road business On March 1, 2016 , Brookfield Infrastructure expanded its toll road operations through the acquisition of a 40% effective interest in an Indian toll road business (BIF India Holdings Pte Ltd) from Gammon Infrastructure Projects Limited for consideration of $42 million through a Brookfield-sponsored infrastructure fund. Concurrently, Brookfield Infrastructure entered into a voting agreement with an affiliate of Brookfield, providing Brookfield Infrastructure the right to direct the relevant activities of the entity, thereby providing Brookfield Infrastructure with control. Accordingly, Brookfield Infrastructure consolidated the entity effective March 1, 2016 . Acquisition costs of $2 million were recorded as Other expenses within the Consolidated Statement of Operating Results in 2016. Consideration transferred US$ MILLIONS Cash $ 42 Total consideration $ 42 Fair value of assets and liabilities acquired as of March 1, 2016 US$ MILLIONS Accounts receivable and other $ 38 Property, plant and equipment 7 Financial assets 142 Intangible assets 147 Deferred income tax assets 10 Accounts payable and other (38 ) Non-recourse borrowings (202 ) Net assets acquired before non-controlling interest 104 Non-controlling interest (1) (62 ) Net assets acquired $ 42 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date which is equal to the consideration paid by the non-controlling interest. Upon acquisition of the Indian toll road business by Brookfield Infrastructure, a deferred tax asset of $10 million was recorded. The deferred tax assets relate to tax losses and are recognized based on management’s best estimate that it is probable that there will be sufficient taxable income against which to utilize the benefits of these tax losses. g) Supplemental information Had the acquisitions of the Brazilian regulated gas transmission business and individually insignificant business combinations been effective January 1, 2017, the revenue and net income of Brookfield Infrastructure would have been $3,911 million (unaudited) and $751 million (unaudited), respectively, for the year ended December 31, 2017. In determining the pro-forma revenue and net income attributable to our partnership, management has: • Calculated depreciation of property, plant and equipment and amortization of intangible assets acquired on the basis of the fair values at the time of the business combination rather than the carrying amounts recognized in the pre-acquisition financial statements and; • Based borrowing costs on the funding levels, credit ratings and debt and equity position of Brookfield Infrastructure after the business combination.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2017
Fair Value Measurement [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS The fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair values are determined by reference to quoted bid or ask prices, as appropriate. Where bid and ask prices are unavailable, the closing price of the most recent transaction of that instrument is used. In the absence of an active market, fair values are determined based on prevailing market rates such as bid and ask prices, as appropriate for instruments with similar characteristics and risk profiles or internal or external valuation models, such as option pricing models and discounted cash flow analyses, using observable market inputs. Fair values determined using valuation models require the use of assumptions concerning the amount and timing of estimated future cash flows and discount rates. In determining those assumptions, Brookfield Infrastructure looks primarily to external readily observable market inputs such as interest rate yield curves, currency rates, and price and rate volatilities as applicable. The fair value of interest rate swap contracts which form part of financing arrangements is calculated by way of discounted cash flows using market interest rates and applicable credit spreads. Classification of Financial Instruments Financial instruments classified as fair value through profit or loss are carried at fair value on the Consolidated Statements of Financial Position. Changes in the fair values of financial instruments classified as fair value through profit or loss are recognized in profit or loss. Mark-to-market adjustments on hedging items for those in an effective hedging relationship and changes in the fair value of available-for-sale securities are recognized in other comprehensive income. Carrying Value and Fair Value of Financial Instruments The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2017 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 374 $ 374 Accounts receivable and other — — 838 838 Financial assets (current and non-current) (1) 608 57 172 837 Marketable securities — 85 — 85 Total $ 608 $ 142 $ 1,384 $ 2,134 Financial liabilities Corporate borrowings $ — $ — $ 2,101 $ 2,101 Non-recourse borrowings (current and non-current) — — 8,063 8,063 Accounts payable and other — — 864 864 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 440 — 873 1,313 Total $ 440 $ — $ 11,921 $ 12,361 (1) Derivative instruments which are elected for hedge accounting totaling $464 million are included in Financial assets and $146 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2016 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 786 $ 786 Accounts receivable and other — — 485 485 Financial assets (current and non-current) (1) 893 12 233 1,138 Marketable securities — 3 — 3 Total $ 893 $ 15 $ 1,504 $ 2,412 Financial liabilities Corporate borrowings $ — $ — $ 1,002 $ 1,002 Non-recourse borrowings (current and non-current) — — 7,324 7,324 Accounts payable and other — — 712 712 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 381 — — 381 Total $ 381 $ — $ 9,058 $ 9,439 (1) Derivative instruments which are elected for hedge accounting totaling $722 million are included in Financial assets and $185 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the carrying values and fair values of financial instruments as at December 31, 2017 and December 31, 2016 : Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial assets Cash and cash equivalents $ 374 $ 374 $ 786 $ 786 Accounts receivable and other 838 838 485 485 Financial assets (current and non-current) 837 837 1,138 1,138 Marketable securities 85 85 3 3 Total $ 2,134 $ 2,134 $ 2,412 $ 2,412 Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial liabilities Corporate borrowings (1) $ 2,101 $ 2,113 $ 1,002 $ 1,023 Non-recourse borrowings (2) 8,063 8,392 7,324 7,478 Accounts payable and other (current and non-current) 864 864 712 712 Preferred shares (3) 20 20 20 20 Financial liabilities (current and non-current) 1,313 1,313 381 381 $ 12,361 $ 12,702 $ 9,439 $ 9,614 (1) Corporate borrowings is classified under level 1 of the fair value hierarchy; quoted prices in an active market are available. (2) Non-recourse borrowings are classified under level 2 of the fair value hierarchy with the exception of certain borrowings at the U.K. port operation, Chilean toll road and Peruvian toll road which are classified under level 1. For level 2 fair values, future cash flows are estimated based on observable forward interest rates at the end of the reporting period. (3) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. Hedging Activities Brookfield Infrastructure uses derivatives and non-derivative financial instruments to manage or maintain exposures to interest and currency risks. For certain derivatives which are used to manage exposures, Brookfield Infrastructure determines whether hedge accounting can be applied. When hedge accounting can be applied, a hedge relationship can be designated as a fair value hedge, cash flow hedge or a hedge of foreign currency exposure of a net investment in a foreign operation with a functional currency other than the U.S. dollar. To qualify for hedge accounting the derivative must be highly effective in accomplishing the objective of offsetting changes in the fair value or cash flows attributable to the hedged risk both at inception and over the life of the hedge. If it is determined that the derivative is not highly effective as a hedge, hedge accounting is discontinued prospectively. Cash Flow Hedges Brookfield Infrastructure uses interest rate swaps to hedge the variability in cash flows related to a variable rate asset or liability and highly probably forecast issuances of debt. The settlement dates coincide with the dates on which the interest is payable on the underlying debt, and the amount accumulated in equity is reclassified to profit or loss over the period that the floating rate interest payments on debt affect profit or loss. For the year ended December 31, 2017 , pre-tax net unrealized gains of $50 million ( 2016 : losses of $14 million , 2015 : losses of $41 million ) were recorded in other comprehensive income for the effective portion of the cash flow hedges. As at December 31, 2017 , there was a net derivative asset balance of $447 million relating to derivative contracts designated as cash flow hedges ( 2016 : asset balance of $464 million ). Net Investment Hedges Brookfield Infrastructure uses foreign exchange contracts and foreign currency denominated debt instruments to manage its foreign currency exposures arising from net investments in foreign operations having a functional currency other than the U.S. dollar. For the year ended December 31, 2017 , unrealized net losses of $202 million ( 2016 : gains of $70 million , 2015 : losses of $131 million ) were recorded in other comprehensive income for the effective portion of hedges of net investments in foreign operations. Further, Brookfield Infrastructure recognized a $64 million loss ( 2016 : gain of $99 million , 2015 : gain of $220 million ) in other comprehensive income relating to the net settlement of foreign exchange contracts in the period. As at December 31, 2017 , there was a net unrealized derivative liability balance of $129 million relating to derivative contracts designated as net investment hedges ( 2016 : net unrealized derivative asset balance of $73 million ). Fair Value Hierarchical Levels—Financial Instruments Fair value hierarchical levels are directly determined by the amount of subjectivity associated with the valuation inputs of these assets and liabilities, and are as follows: Level 1 — Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 — Inputs other than quoted prices included in Level 1 are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Fair valued assets and liabilities that are included in this category are primarily certain derivative contracts and other financial assets carried at fair value in an inactive market. Level 3 — Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to determining the estimate. Fair valued assets and liabilities that are included in this category are interest rate swap contracts, derivative contracts, certain equity securities carried at fair value which are not traded in an active market and the non-controlling interest’s share of net assets of limited life funds. The fair value of our partnership’s financial assets and financial liabilities are measured at fair value on a recurring basis. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s financial assets and financial liabilities: US$ MILLIONS Fair value hierarchy Dec. 31, 2017 Dec. 31, 2016 Marketable securities Level 1 (1) $ 85 $ 3 Foreign currency forward contracts Level 2 (2) Financial asset $ 236 $ 210 Financial liability 196 48 Interest rate swaps & other Level 2 (2) Financial asset $ 381 $ 653 Financial liability 155 287 Other contracts Financial asset Level 3 (3) $ 48 $ 42 Financial liability Level 3 (3) 89 46 (1) Valuation technique: Quoted bid prices in an active market. (2) Valuation technique: Discounted cash flow. Future cash flows are estimated based on forward exchange rates (from observable forward exchange rates at the end of the reporting period) and contract forward rates, discounted at a rate that reflects our credit risk and the credit risk of various counterparties. (3) Valuation technique: Discounted cash flow. Future cash flows primarily driven by freight volumes and the use of assumptions concerning the amount and timing of estimated future cash flows and discount rates. Assets and liabilities measured at fair value on a recurring basis include $750 million ( 2016 : $908 million ) of financial assets and $440 million ( 2016 : $381 million ) of financial liabilities which are measured at fair value using valuation inputs based on management’s best estimates. During the year, no transfers were made between level 1 and 2 or level 2 and 3. The following table categorizes financial assets and liabilities, which are carried at fair value, based upon the level of input. Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 85 $ — $ — $ 3 $ — $ — Financial assets (current and non-current) — 617 48 — 863 42 Financial liabilities Financial liabilities (current and non-current) $ — $ 351 $ 89 $ — $ 335 $ 46

CASH AND CASH EQUIVALENTS

CASH AND CASH EQUIVALENTS	12 Months Ended
	Dec. 31, 2017
Cash and cash equivalents [abstract]
CASH AND CASH EQUIVALENTS	CASH AND CASH EQUIVALENTS US$ MILLIONS 2017 2016 Cash $ 258 $ 652 Restricted cash (1) 33 84 Cash equivalents (2) 83 50 Total cash and cash equivalents $ 374 $ 786 (1) Restricted cash primarily relates to our partnership’s financing arrangements, including debt service accounts. (2) Short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value.

FINANCIAL ASSETS

FINANCIAL ASSETS	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
FINANCIAL ASSETS	FINANCIAL ASSETS US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 10 $ 132 Loans and receivables 43 73 Marketable securities 85 3 Other 54 33 Total current $ 192 $ 241 Non-current: Cross currency interest rate swaps $ 243 $ 589 Loans and receivables 210 172 Foreign currency forward contracts 226 78 Other 51 61 Total non-current $ 730 $ 900 FINANCIAL LIABILITIES US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 150 $ 47 Other financial liabilities 87 182 Total current financial liabilities $ 237 $ 229 Non-current: Interest rate swaps $ 9 $ 34 Inflation swaps 84 97 Deferred consideration (1) 916 — Other financial liabilities 67 21 Total non-current financial liabilities $ 1,076 $ 152 (1) The deferred consideration is related to the acquisitions completed during 2017. See Note 5, Acquisition of Businesses for further details.

ACCOUNTS RECEIVABLE AND OTHER

ACCOUNTS RECEIVABLE AND OTHER	12 Months Ended
	Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]
ACCOUNTS RECEIVABLE AND OTHER	ACCOUNTS RECEIVABLE AND OTHER US$ MILLIONS 2017 2016 Current: Accounts receivable $ 738 $ 395 Prepayments & other assets 100 109 Total current $ 838 $ 504 Non-current: Tax recovery receivables $ 52 $ 55 Other assets 221 110 Total non-current $ 273 $ 165

INVENTORY

INVENTORY	12 Months Ended
	Dec. 31, 2017
Inventories [Abstract]
INVENTORY	INVENTORY US$ MILLIONS 2017 2016 Current: Natural gas inventory $ 84 $ 82 Raw materials and consumables 24 19 Carrying amount of inventories $ 108 $ 101 During the year ended December 31, 2017 , Brookfield Infrastructure recognized $418 million ( 2016 : $154 million , 2015 : $ nil ) worth of inventories as an expense in the Consolidated Statements of Operating Results and $ nil ( 2016 : $ nil , 2015 : $ nil ) relating to impairments of inventory.

INVESTMENT IN ASSOCIATES AND JO

INVESTMENT IN ASSOCIATES AND JOINT VENTURES	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
INVESTMENT IN ASSOCIATES AND JOINT VENTURES	INVESTMENT IN ASSOCIATES AND JOINT VENTURES The following table presents the ownership interest and carrying values of Brookfield Infrastructure’s investments in associates and joint ventures: Name of entity Ownership and Voting Interest Carrying Value US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Dec. 31, 2017 Dec. 31, 2016 Brazilian toll road (1),(2) Arteris S.A. 45 % 49 % $ 1,715 $ 1,505 North American natural gas transmission operation (3),(4) Natural Gas Pipeline of America LLC 50 % 50 % 1,013 806 Chilean electricity transmission operation (5) 28 % 28 % 930 699 European telecommunications infrastructure operations TDF Infrastructure SAS 21 % 21 % 614 536 Brazilian rail business VLI S.A. 11 % 11 % 436 376 Australian ports operation (6) Patrick Terminals, held through PTH No 1 Pty Ltd 13 % 13 % 191 181 Other (7) 11%-50% 11%-50% 673 624 Total $ 5,572 $ 4,727 The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS 2017 2016 Balance at beginning of year $ 4,727 $ 2,973 Share of earnings for the year (3) 118 248 Foreign currency translation and other 167 219 Share of other comprehensive income 183 225 Distributions (66 ) (46 ) Disposition of interest (1) (177 ) — Acquisitions (2),(4),(5) 620 1,108 Balance at end of year $ 5,572 $ 4,727 \ (1) In August 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund, reorganized the holding entities of its investment in the Brazilian toll road operation. This transaction resulted in no gain or loss being recorded within the Consolidated Statements of Operating Results. The reorganization resulted in Brookfield Infrastructure no longer consolidating an 8% interest of the investment attributable to an institutional partner. The reorganization concurrently reduced the investments in associates and joint venture and non-controlling interest partnership capital balances by $177 million during the third quarter of 2017. (2) Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership interest to 45% . (3) Share of earnings for the year ended December 31, 2016 includes $195 million of non-recurring gains primarily related to our transport and energy operations. (4) In May 2017, Brookfield Infrastructure and its partner in its North American natural gas transmission operation each injected $200 million into the business to pay down operating level debt. A similar transaction was completed in April 2016 by Brookfield Infrastructure and its partner in the amount of $312 million . (5) During December 2017, our partnership signed an agreement to sell our ownership in ETC Transmission Holdings. Completion of this transaction is subject to certain closing conditions, third party consents and regulatory approvals. (6) In August 2016 , Brookfield Infrastructure expanded its ports operations in Australia as it acquired an effective 13% interest in PTH No 1 Pty Ltd (“Patrick”) through a Brookfield-sponsored infrastructure fund, alongside institutional partners, for total consideration of $202 million . The Brookfield consortium maintains 50% of the voting rights of Patrick in a joint venture with Qube Holdings Limited, along with its institutional partners. Brookfield Infrastructure has joint control through its position in the business. Accordingly, Brookfield Infrastructure equity accounts for the entity. (7) Other includes our partnership’s Texas electricity transmission project, Brazil electricity transmission operation, European port operation, North American west coast container terminal, U.S. gas storage operation and other investments in associates and joint ventures held through consolidated subsidiaries. The following tables present the gross assets and liabilities of Brookfield Infrastructure’s investments in associates and joint ventures: As at December 31, 2017 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 304 $ 5,769 $ 6,073 $ 602 $ 2,102 $ 2,704 $ 3,369 $ 1,654 $ 1,715 North American natural gas transmission operation 139 4,741 4,880 139 2,716 2,855 2,025 1,012 1,013 Chilean electricity transmission operation 280 7,122 7,402 181 3,874 4,055 3,347 2,417 930 European telecommunications infrastructure operation 464 6,281 6,745 561 2,968 3,529 3,216 2,602 614 Brazilian rail business 743 6,131 6,874 515 2,405 2,920 3,954 3,518 436 Australian ports operation 198 2,281 2,479 24 1,332 1,356 1,123 932 191 Other 694 5,228 5,922 865 2,291 3,156 2,766 2,093 673 Total $ 2,822 $ 37,553 $ 40,375 $ 2,887 $ 17,688 $ 20,575 $ 19,800 $ 14,228 $ 5,572 As at December 31, 2016 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 263 $ 4,977 $ 5,240 $ 823 $ 1,665 $ 2,488 $ 2,752 $ 1,247 $ 1,505 North American natural gas transmission operation 122 5,767 5,889 1,353 2,925 4,278 1,611 805 806 Chilean electricity transmission operation 221 5,519 5,740 142 3,234 3,376 2,364 1,665 699 European telecommunications infrastructure operation 328 5,437 5,765 443 2,528 2,971 2,794 2,258 536 Brazilian rail business 460 5,265 5,725 674 1,645 2,319 3,406 3,030 376 Australian ports operation 171 2,166 2,337 66 1,229 1,295 1,042 861 181 Other 360 4,378 4,738 515 1,827 2,342 2,396 1,772 624 Total $ 1,925 $ 33,509 $ 35,434 $ 4,016 $ 15,053 $ 19,069 $ 16,365 $ 11,638 $ 4,727 The following tables present the gross amounts of revenue, net income, other comprehensive income from Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 928 $ 95 $ (39 ) $ 56 $ 19 $ 37 North American natural gas transmission operation 681 15 (1 ) 14 7 7 Chilean electricity transmission operation 441 37 806 843 609 234 European telecommunications infrastructure operation 783 58 435 493 409 84 Brazilian rail business 1,409 56 490 546 486 60 Australian ports operation 418 19 78 97 80 17 Other 1,809 98 (19 ) 79 55 24 Total $ 6,469 $ 378 $ 1,750 $ 2,128 $ 1,665 $ 463 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 766 $ 185 $ 382 $ 567 $ 275 $ 292 North American natural gas transmission operation 573 133 5 138 69 69 Chilean electricity transmission operation 433 38 217 255 184 71 European telecommunications infrastructure operation 767 121 376 497 393 104 Brazilian rail business 1,024 70 976 1,046 931 115 Australian ports operation 164 (31 ) (81 ) (112 ) (97 ) (15 ) Other 1,091 54 280 334 278 56 Total $ 4,818 $ 570 $ 2,155 $ 2,725 $ 2,033 $ 692 Year ended December 31, 2015 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 758 $ (12 ) $ (1,118 ) $ (1,130 ) $ (778 ) $ (352 ) North American natural gas transmission operation 522 (29 ) — (29 ) (19 ) (10 ) Chilean electricity transmission operation 432 75 (145 ) (70 ) (51 ) (19 ) European telecommunications infrastructure operation 579 62 72 134 104 30 Brazilian rail business 1,074 136 (668 ) (532 ) (474 ) (58 ) Other 947 94 212 306 241 65 Total $ 4,312 $ 326 $ (1,647 ) $ (1,321 ) $ (977 ) $ (344 ) As at December 31, 2017 and 2016 , none of the associates or joint ventures have quoted prices in an active market. The following tables present the cash flow activities of Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 345 $ (1,046 ) $ 800 $ 99 $ 57 $ 42 North American natural gas transmission operation 258 (169 ) (79 ) 10 5 5 Chilean electricity transmission operation 256 (240 ) 14 30 22 8 European telecommunications infrastructure operation 338 (226 ) (58 ) 54 43 11 Brazilian rail business 472 (458 ) 292 306 272 34 Australian ports operation 80 (15 ) (22 ) 43 40 3 Other 284 (729 ) 538 93 80 13 Total $ 2,033 $ (2,883 ) $ 1,485 $ 635 $ 519 $ 116 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 249 $ (491 ) $ 212 $ (30 ) $ (19 ) $ (11 ) North American natural gas transmission operation 163 (170 ) 2 (5 ) (2 ) (3 ) Chilean electricity transmission operation 273 (207 ) (27 ) 39 28 11 European telecommunications infrastructure operation 325 (323 ) (83 ) (81 ) (64 ) (17 ) Brazilian rail business 337 (780 ) 272 (171 ) (152 ) (19 ) Australian ports operation 15 (391 ) 433 57 47 10 Other 142 (229 ) 71 (16 ) (15 ) (1 ) Total $ 1,504 $ (2,591 ) $ 880 $ (207 ) $ (177 ) $ (30 ) Year ended December 31, 2015 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 194 $ (534 ) $ 59 $ (281 ) $ (194 ) $ (87 ) North American natural gas transmission operation 98 (157 ) 10 (49 ) (32 ) (17 ) Chilean electricity transmission operation 274 (122 ) (197 ) (45 ) (32 ) (13 ) European telecommunications infrastructure operation 253 (101 ) (19 ) 133 106 27 Brazilian rail business 309 (929 ) 588 (32 ) (29 ) (3 ) Other 154 (89 ) (36 ) 29 18 11 Total $ 1,282 $ (1,932 ) $ 405 $ (245 ) $ (163 ) $ (82 )

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2017
Property, plant and equipment [abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT US$ MILLIONS Utility Assets Transport Assets Energy Assets Total Assets Gross Carrying Amount: Balance at January 1, 2016 $ 2,945 $ 2,150 $ 1,457 $ 6,552 Additions, net of disposals 399 76 89 564 Non-cash (disposals) additions (31 ) 3 — (28 ) Acquisitions through business combinations (1) — 242 825 1,067 Net foreign currency exchange differences (418 ) (109 ) 9 (518 ) Balance at December 31, 2016 $ 2,895 $ 2,362 $ 2,380 $ 7,637 Additions, net of disposals 349 104 95 548 Non-cash disposals — — (14 ) (14 ) Acquisitions through business combinations (1) — — 100 100 Net foreign currency exchange differences 227 191 68 486 Balance at December 31, 2017 $ 3,471 $ 2,657 $ 2,629 $ 8,757 Accumulated depreciation: Balance at January 1, 2016 $ (291 ) $ (418 ) $ (159 ) $ (868 ) Depreciation expense (128 ) (127 ) (99 ) (354 ) Non-cash disposals — 4 — 4 Net foreign currency exchange differences 36 24 — 60 Balance at December 31, 2016 $ (383 ) $ (517 ) $ (258 ) $ (1,158 ) Depreciation expense (118 ) (147 ) (117 ) (382 ) Disposals 19 21 — 40 Non-cash disposals — — 5 5 Net foreign currency exchange differences (28 ) (44 ) (13 ) (85 ) Balance at December 31, 2017 $ (510 ) $ (687 ) $ (383 ) $ (1,580 ) Accumulated fair value adjustments: Balance at January 1, 2016 $ 945 $ 777 $ 226 $ 1,948 Fair value adjustments 185 25 125 335 Net foreign currency exchange differences (87 ) (20 ) 1 (106 ) Balance at December 31, 2016 $ 1,043 $ 782 $ 352 $ 2,177 Fair value adjustments 137 24 257 418 Net foreign currency exchange differences 78 67 20 165 Balance at December 31, 2017 $ 1,258 $ 873 $ 629 $ 2,760 Net book value: December 31, 2017 $ 4,219 $ 2,843 $ 2,875 $ 9,937 December 31, 2016 $ 3,555 $ 2,627 $ 2,474 $ 8,656 (1) See Note 5 , Acquisition of Business for additional information. The fair value of our partnership’s property, plant, and equipment is measured at fair value on a recurring basis with an effective date of revaluation for all asset classes of December 31, 2017 and 2016 . Brookfield Infrastructure determined fair value under the income method. Assets under development were revalued where fair value could be reliably measured. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s property, plant and equipment assets, categorized by segment. Dec. 31, 2017 Dec. 31, 2016 Segment Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Utilities Discounted cash flow model 7% to 12% 7x to 21x 10 to 20 yrs Discounted cash flow model 7% to 12% 7x to 18x 10 to 20 yrs Transport Discounted cash flow model 10% to 15% 9x to 14x 10 to 20 yrs Discounted cash flow model 10% to 17% 8x to 14x 10 to 20 yrs Energy Discounted cash flow model 12% to 15% 8x to 13x 10 yrs Discounted cash flow model 9% to 14% 10x to 12x 10 yrs An increase in the discount rate would lead to a decrease in the fair value of property, plant and equipment. Conversely, an increase to the terminal value multiple would increase the fair value of property, plant and equipment. Our partnership has classified all property, plant and equipment under level 3 of the fair value hierarchy. At December 31, 2017 , Brookfield Infrastructure carried out an assessment of the fair value of its Utilities property, plant and equipment, resulting in a gain from revaluation of $137 million ( 2016 : $185 million ) which was recognized in revaluation surplus in the Consolidated Statements of Comprehensive Income. Key drivers behind the revaluation gain recorded include; growth in underlying cash flows at our U.K. regulated distribution business associated with new connections made during the year and a modest increase in our terminal value assumption commensurate with observable market valuations for regulated utility businesses in mature geographies. At December 31, 2017 , Brookfield Infrastructure carried out an assessment of the fair value of its Transport property, plant and equipment. A gain from revaluation of $24 million ( 2016 : $25 million ) was recognized in revaluation surplus in the Consolidated Statements of Comprehensive Income. Underlying valuation assumptions in the Transport segment remain relatively consistent with the prior year. The reduction in the discount rate range was associated with successful de-risking activities executed during the first full year of ownership at our Australian ports operation. At December 31, 2017 , Brookfield Infrastructure carried out an assessment of the fair value of its Energy property, plant and equipment. A gain from revaluation of $257 million ( 2016 : $125 million ) was recognized in revaluation surplus in the Consolidated Statements of Comprehensive Income. The revaluation gain was primarily associated with growth in underlying cash flows at our North American district energy operations associated with new customer connections during the last 12 months and a more robust pipeline of growth opportunities underway in the business. The increase in discount rate and reduction in terminal value assumptions for the segment relate to our Australian district energy operation where we have updated the valuation assumptions in response to the inclusion of a higher level of organic growth projects that are in the early stages of development. The following table summarizes the carrying amount of property, plant and equipment that would have been recognized had assets been carried under the cost model. US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Utilities $ 2,961 $ 2,512 Transport 1,970 1,845 Energy 2,246 2,122

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2017
Intangible Assets [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS US$ MILLIONS 2017 2016 Cost $ 10,470 $ 4,732 Accumulated amortization (576 ) (267 ) Net intangible assets $ 9,894 $ 4,465 Intangible assets are allocated to the following cash generating units: US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Brazilian regulated gas transmission operation $ 5,134 $ — Australian regulated terminal 1,957 1,817 Peruvian toll roads 1,144 1,049 Chilean toll roads 1,100 1,054 U.K. port operation 289 265 Indian toll roads 130 136 Other 140 144 Total $ 9,894 $ 4,465 The intangible assets at Brookfield Infrastructure’s Brazilian regulated gas transmission operation, Australian regulated terminal operation, and Chilean, Peruvian and Indian toll roads relate to service concession arrangements. The terms and conditions of concession arrangements at the Brazilian regulated gas transmission operation are regulated by the Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (“ANP”). Each gas transportation agreement (“GTA”) took into account a return on regulatory asset base (“RAB”) , and the tariffs were calculated on an inflation adjusted regulatory weighted average cost of capital (“WACC”) fixed for the GTA life. Upon expiry of the authorizations, the assets shall be returned to the government and subject to concession upon public bidding. These assets operate as authorizations that expire between 2039 and 2041. The terms and conditions of access to the Australian regulated terminal’s services, including tariffs that can be charged to the users, are regulated by the Queensland Competition Authority. Brookfield Infrastructure’s Australian regulated terminal operation has Standard Access Agreements with the users of the terminal which entails 100% take-or-pay contracts at a designated tariff rate based on the asset value. The concession arrangement has an expiration date of 2051 with an option to extend the arrangement for an additional 49 years . The terms and conditions of the Chilean toll roads concession, including tariffs that can be charged to the users and the duties to be performed by the operator, are regulated by the Ministerio de Obras Publicas (“MOP”). The service concession provides the operator the right to charge a tariff to vehicles which use the road over the term of the concession in exchange for operating the road, including preserving the road based on a defined maintenance and construction schedule. Tariffs are adjusted annually for the Chilean Consumer Price Index plus 3.5% , in addition to congestion charges which may be levied should specified traffic levels be reached. The concession arrangement has an expiration date of 2033 at which point the underlying concessions assets will be returned to the MOP. The terms and conditions of the Peruvian toll roads concession, including tariffs that can be charged to the users and the duties to be performed by the operator, are regulated by the Municipalidad Metropolitana de Lima (“MML”) and its municipal arm, Fondo Metropolitano de Inversiones. The service concession provides the operator the right to charge a tariff to vehicles which use the road network over the life of the concession in exchange for the design, construction, improvement, maintenance and operation of the road network. Until December 2018, tariffs are increased by fixed amounts and on specified dates, and thereafter, are adjusted annually for the Lima Metropolitana Consumer Price Index. For the year ended December 31, 2017 , revenue and profit related to construction contracts were $31 million ( 2016 : $66 million , 2015 : $ nil ) and $ nil ( 2016 : $ nil , 2015 : $ nil ), respectively. Due to construction services relating to the concession arrangement $35 million ( 2016 : $20 million , 2015 : $ nil ) of borrowing costs were capitalized as an intangible asset, based on the stage of project completion. The concession arrangement has an expiration date of 2043 at which point the underlying concession assets will be returned to the MML. The intangible asset at Brookfield Infrastructure’s U.K. port operation relates to a conservancy right. As a right in perpetuity issued by the Statutory Harbour Authority in the U.K., the conservancy right is classified as having an indefinite life, and is subject to an annual impairment review. The terms and conditions of Mumbai Nasik Indian toll road concession, including tariffs that can be charged to the users and the duties to be performed by the operator, are regulated by National Highways Authority of India (“NHAI”). The Service Concession Agreement provides the operator the right to charge a tariff to vehicles which use the road over the term of the concession in exchange for operating the road, including preserving the road based on a defined maintenance schedule. Tariffs are revised annually for the Indian Wholesale Price Index. The Concession Arrangement has an expiration date of 2027 at which point the underlying concessions assets will be returned to NHAI. The carrying value as at December 31, 2017 , of Brookfield Infrastructure’s indefinite lived intangibles is $297 million ( 2016 : $274 million ). The following table presents the change in the cost balance of intangible assets: US$ MILLIONS 2017 2016 Cost at beginning of the year $ 4,732 $ 3,485 Additions, net of disposals 79 116 Acquisitions through business combinations (1) 5,515 1,189 Non-cash additions 18 — Foreign currency translation 126 (58 ) Cost at end of year $ 10,470 $ 4,732 (1) See Note 5 , Acquisition of Business for additional information. The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets: US$ MILLIONS 2017 2016 Accumulated amortization at beginning of year $ (267 ) $ (189 ) Amortization (289 ) (93 ) Foreign currency translation (20 ) 15 Accumulated amortization at end of year $ (576 ) $ (267 )

GOODWILL

GOODWILL	12 Months Ended
	Dec. 31, 2017
Intangible Assets [Abstract]
GOODWILL	GOODWILL The following table presents the carrying amount for Brookfield Infrastructure’s goodwill: US$ MILLIONS 2017 2016 Balance at beginning of the year $ 502 $ 79 Acquisitions through business combinations (1) 815 431 Foreign currency translation and other (16 ) (8 ) Balance at end of the year $ 1,301 $ 502 (1) See Note 5 , Acquisition of Business for additional information.

INVESTMENT PROPERTIES

INVESTMENT PROPERTIES	12 Months Ended
	Dec. 31, 2017
Investment property [abstract]
INVESTMENT PROPERTIES	INVESTMENT PROPERTIES The following table presents the carrying amount for Brookfield Infrastructure’s investment properties: US$ MILLIONS 2017 2016 Balance at beginning of the year $ 154 $ 153 Additions, net of disposals — 3 Non-cash additions — 10 Fair value adjustments 23 12 Foreign currency translation 15 (24 ) Balance at end of the year $ 192 $ 154 For the year ended December 31, 2017 , fair value adjustments of $23 million were recognized for the U.K. port operation ( 2016 : $12 million ). Investment properties are measured at fair value on a recurring basis and the effective date of revaluation is December 31, 2017 and 2016 . The fair value of our partnership’s investment properties are determined by management of our partnership with due consideration given to other relevant market conditions. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s investment property. Our partnership has classified all assets below under level 3 of the fair value hierarchy: Segment Valuation technique Significant unobservable inputs Range of inputs Transport Direct Income Capitalization Capitalization Rate 6% to 14% An increase in the capitalization rate would lead to a decrease in the fair value of investment property, with the opposite impact for a decrease in the capitalization rate.

ACCOUNTS PAYABLE AND OTHER

ACCOUNTS PAYABLE AND OTHER	12 Months Ended
	Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]
ACCOUNTS PAYABLE AND OTHER	ACCOUNTS PAYABLE AND OTHER US$ MILLIONS Note 2017 2016 Current: Accounts payable (1) $ 246 $ 266 Accrued & other liabilities 400 274 Deferred revenue (i) 159 108 Provisions 59 64 Total current $ 864 $ 712 Non-current: Deferred revenue (i) $ 300 $ 293 Pension liabilities (2) 100 98 Provisions 95 41 Other liabilities 298 148 Total non-current $ 793 $ 580 (1) The average credit period on purchases of goods and services is 30 days. No interest is incurred on trade creditors. Brookfield Infrastructure has financial risk management policies in place to ensure that all payables are paid within the pre-agreed credit terms. (2) See Note 31 , Retirement Benefit Plans for further details. Brookfield Infrastructure’s exposure to currency and liquidity risk related to trade and other payables is disclosed in Note 34 , Financial Risk Management. (i) Deferred revenue Deferred revenue relates primarily to cash contributions from third parties to build or upgrade existing network capabilities at Brookfield Infrastructure’s Australian rail operation and for future natural gas and electricity connections at Brookfield Infrastructure’s U.K. regulated distribution operation. The deferred revenue is recorded on receipt of cash payments and recognized as revenue over the life of the contracted track access or connections arrangement.

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
BORROWINGS	BORROWINGS (a) Corporate Borrowings Brookfield Infrastructure has a $1.975 billion senior unsecured revolving credit facility used for general working capital including acquisitions. The $1.975 billion is available on a revolving basis for the full term of the facility. All amounts outstanding under this facility will be repayable on June 30, 2022 . All obligations of Brookfield Infrastructure under the facility are guaranteed by our partnership. Loans under this facility accrue interest at a floating rate based on LIBOR plus 1.20% . Brookfield Infrastructure is required to pay an unused commitment fee under the facility of 18 basis points per annum. As at December 31, 2017 , draws on the credit facility were $789 million ( 2016 : $ nil ) and $106 million of letters of credit were issued ( 2016 : $46 million ). Subsequent to year end, Brookfield Infrastructure cancelled $59 million letters of credit. Maturity Annual Rate Currency 2017 2016 Corporate revolving credit facility June 30, 2022 LIBOR plus 1.2% US$ 789 — Medium Term Notes (1) : Current: Public - Canadian October 10, 2017 3.5% C$ — 295 Public - Canadian October 30, 2018 3.0% C$ 99 93 Non-Current: Public - Canadian October 30, 2020 3.5% C$ 298 279 Public - Canadian March 11, 2022 3.5% C$ 358 335 Public - Canadian February 22, 2024 3.3% C$ 239 — Public - Canadian February 22, 2024 3.3% C$ 318 — Total $ 2,101 $ 1,002 (1) See Note 19 , Subsidiary Public Issuers for further details. On April 17, 2017, Brookfield Infrastructure Finance ULC, a wholly-owned subsidiary of Brookfield Infrastructure, issued C$400 million or $309 million of medium-term notes maturing February 22, 2024 with a coupon of 3.3% . The notes were issued at a premium with an effective interest rate of 3.1% per annum, which was swapped into U.S. dollars on a matched maturity basis at an all-in rate of 4.0% . On February 22, 2017, Brookfield Infrastructure Finance ULC, a wholly-owned subsidiary of Brookfield Infrastructure, issued C$300 million or $228 million of medium-term notes maturing February 22, 2024 with a coupon of 3.3% , which was swapped into U.S. dollars on a matched maturity basis at an all-in rate of 4.1% . On October 10, 2017, Brookfield Infrastructure Finance Pty Ltd, a wholly-owned subsidiary of Brookfield Infrastructure, repaid C$400 million or $306 million of medium-term notes. The strengthening of the Canadian dollar against the U.S. dollar during the twelve -month period ended December 31, 2017 resulted in an increase in corporate borrowings of $79 million from December 31, 2016 . Brookfield Infrastructure has entered into a $500 million revolving credit facility with Brookfield to provide additional liquidity for general corporate purposes and capital expenditures, if required. The revolving credit facility has an effective date of February 8, 2018 and automatically renews for four consecutive one year terms on the first, second, third and fourth anniversary of such effective date, which would result it in ultimately maturing on February 8, 2023. Brookfield has the option to terminate the agreement prior to February 8 each year by providing Brookfield Infrastructure with written notice. All obligations of Brookfield Infrastructure under the facility were guaranteed by our partnership. Loans under this facility accrued interest on LIBOR plus 2.00% and no commitment fees were incurred for any undrawn balance. As of December 31, 2017 , there were $ nil (2016: $ nil ) of borrowings outstanding. Subsequent to year end, Brookfield placed $400 million on deposit with Brookfield Infrastructure through the revolving credit facility. (b) Non-Recourse Borrowings The current and non-current balances of non-recourse borrowings are as follows: US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Current $ 364 $ 279 Non-current 7,699 7,045 Total $ 8,063 $ 7,324 Non-recourse borrowings have increased by $739 million since year-end. This increase is attributable to a $379 million increase of foreign denominated debt balances, predominantly the Australian dollar and the British pound, and increased borrowings of $360 million primarily to fund organic growth initiatives. Subsequent to year end, on February 14, 2018, our North American gas storage operation issued $400 million of senior secured notes due March 31, 2023 with a coupon of 7% . Principal repayments on non-recourse borrowings due over the next five years and thereafter are as follows: US$ MILLIONS Utilities Transport Energy Total 2018 — 143 229 372 2019 87 261 222 570 2020 304 210 69 583 2021 461 230 4 695 2022 440 323 4 767 Thereafter 2,358 2,095 647 5,100 Total Principal repayments 3,650 3,262 1,175 8,087 Deferred financing costs and other (1 ) (5 ) (18 ) (24 ) Total - Dec. 31, 2017 $ 3,649 $ 3,257 $ 1,157 $ 8,063 Total - Dec. 31, 2016 $ 3,207 $ 3,163 $ 954 $ 7,324 The weighted average interest rate of non-recourse borrowings are as follows: US$ MILLIONS Utilities Transport Energy Total Dec. 31, 2017 4 % 5 % 5 % 5 % Dec. 31, 2016 4 % 5 % 5 % 5 % Principal repayments on non-recourse borrowings in their local currency are as follows: US$ MILLIONS, except as noted Dec. 31, 2017 Local Currency Dec. 31, 2016 Local Currency Australian dollars $ 1,013 AUD 1,297 $ 922 AUD 1,281 British pounds 1,735 GBP 1,283 1,390 GBP 1,125 U.S. dollars 3,087 USD 3,087 3,039 USD 3,039 Chilean Unidad de Fomento (1) 960 UF 22 901 UF 23 Canadian dollars 397 CAD 499 263 CAD 354 Colombian pesos 184 COP 549,384 133 COP 403,030 Peruvian soles 458 PEN 1,483 439 PEN 1,473 Indian rupees 186 INR 11,847 196 INR 13,324 New Zealand dollars 43 NZD 61 41 NZD 59 (1) Chilean Unidad de Fomento is an inflation adjusted unit of account indexed to the Chilean Peso. (c) Supplemental Information Details of the “Changes in liabilities from financing activities”, including both changes arising from cash flows and non-cash changes are as follows: US$ MILLIONS 2016 Cash Flows Acquisition Foreign Exchange Movement Fair Value Changes 2017 Corporate borrowings $ 1,002 $ 1,020 $ — $ 79 $ — $ 2,101 Non-recourse borrowings 7,324 360 — 379 — 8,063

SUBSIDIARY PUBLIC ISSUERS

SUBSIDIARY PUBLIC ISSUERS	12 Months Ended
	Dec. 31, 2017
Subsidiary Public Issuer [Abstract]
SUBSIDIARY PUBLIC ISSUERS	SUBSIDIARY PUBLIC ISSUERS An indenture dated as of October 10, 2012 between certain wholly-owned subsidiaries of our partnership, Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (collectively, the “Debt Issuers” together with Brookfield Infrastructure Preferred Equity Inc. the “Issuers”), and Computershare Trust Company of Canada, as supplemented and amended from time to time (“Indenture”) provides for the distribution of one or more series of unsecured debentures or notes of the Debt Issuers. On April 17, 2017 , the Debt Issuers issued C$ 400 million of medium-term notes under the Indenture maturing February 22, 2024 in the Canadian bond market with a coupon of 3.3% , which was swapped into U.S. dollars on a matched maturity basis at an all-in rate of 4.0% . On February 22, 2017 , the Debt Issuers issued C $300 million of medium-term notes under the Indenture maturing February 22, 2024 in the Canadian bond market with a coupon of 3.3% , which was swapped into U.S. dollars on a matched maturity basis at an all-in rate of 4.1% . On October 30, 2015 , the Debt Issuers issued C $500 million of medium-term notes under the Indenture in the Canadian bond market in two tranches: C $125 million of three year notes maturing October 30, 2018 with a coupon of 3.0% ; and C $375 million of five year notes maturing October 30, 2020 with a coupon of 3.5% . The 3 years and 5 years bonds were swapped into U.S. dollars on a matched maturity basis at an all-in rate of 3.8% . On March 11, 2015 , the Debt Issuers issued C $450 million of medium-term notes under the Indenture maturing March 11, 2022 in the Canadian bond market with a coupon of 3.5% , which was swapped into U.S. dollars on a matched maturity basis at an all-in rate of 3.9% . As they matured, the partnership repaid C $400 million of medium-term notes on October 10, 2017 . These notes are unconditionally guaranteed by our partnership and its subsidiaries the Holding LP, Brookfield Infrastructure Holdings (Canada) Inc., Brookfield Infrastructure US Holdings I Corporation and BIP Bermuda Holdings I Limited. The following tables set forth consolidated summary financial information for our partnership and the Issuers: For the year ended December 31, 2017 Our partnership (2) The Issuers Subsidiaries of our partnership other than the Issuers (3) Consolidating adjustments (4) Our partnership consolidated Revenues $ — $ — $ — $ 3,535 $ 3,535 Net income attributable to partnership (1) 11 — 125 (11 ) 125 For the year ended December 31, 2016 Revenues $ — $ — $ — $ 2,115 $ 2,115 Net income attributable to partnership (1) 285 — 487 (285 ) 487 For the year ended December 31, 2015 Revenues $ — $ — $ — $ 1,855 $ 1,855 Net income attributable to partnership (1) 169 — 301 (169 ) 301 As at December 31, 2017 Current assets $ — $ — $ — $ 1,512 $ 1,512 Non-current assets 5,514 — 5,987 16,464 27,965 Current liabilities — — — 1,564 1,564 Non-current liabilities — 1,313 — 13,126 14,439 Non-controlling interests—Redeemable Partnership Units held by Brookfield — — — 2,012 2,012 Non-controlling interests—in operating subsidiaries — — — 5,875 5,875 Preferred unitholders — — — 595 595 As at December 31, 2016 Current assets $ — $ 3 $ — $ 1,629 $ 1,632 Non-current assets 4,937 297 5,248 9,161 19,643 Current liabilities — 5 — 1,510 1,515 Non-current liabilities — 1,004 — 9,112 10,116 Non-controlling interests—Redeemable Partnership Units held by Brookfield — — — 1,860 1,860 Non-controlling interests—in operating subsidiaries — — — 2,771 2,771 Preferred unitholders — — — 375 375 (1) Includes net income attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. (2) Includes investments in all subsidiaries of our partnership under the equity method. (3) Includes investments in all subsidiaries of the Holding LP, Brookfield Infrastructure Holdings (Canada) Inc., Brookfield Infrastructure US Holdings I Corporation and BIP Bermuda Holdings I Limited under the equity method. (4) Includes elimination of intercompany transactions and balances necessary to present our partnership on a consolidated basis.

PREFERRED SHARES

PREFERRED SHARES	12 Months Ended
	Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract]
PREFERRED SHARES	PREFERRED SHARES As at December 31, 2017 , Brookfield Infrastructure Holdings (Canada) Inc., Brookfield Infrastructure US Holdings I Corporation and BIP Bermuda Holdings I Limited (wholly owned subsidiaries of Brookfield Infrastructure) have issued 196,000 , 1 and 400,000 preferred shares, respectively, to wholly owned subsidiaries of Brookfield, for proceeds of $5 million , $5 million and $10 million , respectively ( 2016 : $5 million , $5 million and $10 million , respectively). Each preferred share is non-voting and is redeemable at $25 per share except in the case of the preferred share issued by Brookfield Infrastructure US Holdings I Corporation, which is redeemable for $5 million . Each of these preferred shares is redeemable, together with any accrued and unpaid dividends, at the option of the issuer on or after the tenth anniversary of the date of issue, subject to certain restrictions. Further, these preferred shares entitle the holders thereof to a fixed cumulative 6% preferential cash dividend payable quarterly as and when declared by the issuer’s board of directors. At December 31, 2017 , there were no dividends in arrears (2016: $ nil ).

REVENUES

REVENUES	12 Months Ended
	Dec. 31, 2017
Revenue [abstract]
REVENUES	REVENUES Brookfield Infrastructure’s revenue arises from the rendering of services by the following operating segments: US$ MILLIONS 2017 2016 2015 Utilities Regulated Transmission $ 938 $ 27 $ 43 Regulated Terminal 301 299 330 Regulated Distribution 546 499 491 Transport Rail 296 270 316 Ports 681 360 220 Toll Roads 313 262 113 Energy Transmission & Storage 150 141 105 District Energy 310 257 237 $ 3,535 $ 2,115 $ 1,855

INTEREST EXPENSE

INTEREST EXPENSE	12 Months Ended
	Dec. 31, 2017
Analysis of income and expense [abstract]
INTEREST EXPENSE	INTEREST EXPENSE US$ MILLIONS 2017 2016 2015 Interest on corporate facility $ 12 $ 12 $ 5 Interest on corporate debt 51 39 22 Interest on non-recourse borrowings 361 338 334 Other financing fees 4 3 6 $ 428 $ 392 $ 367

PAYROLL EXPENSE

PAYROLL EXPENSE	12 Months Ended
	Dec. 31, 2017
Analysis of income and expense [abstract]
PAYROLL EXPENSE	PAYROLL EXPENSE Our partnership has no key employees or directors; therefore Brookfield Infrastructure does not remunerate key management personnel. Key decision makers of Brookfield Infrastructure are all employees of the ultimate parent company who provide management services under Brookfield Infrastructure’s Master Services Agreement. Details of the management fees paid in lieu of payroll are disclosed in Note 32 , Related Party Transactions. Throughout the year, the General Partner in its capacity as our partnership’s general partner, incurs director fees, a portion of which are charged to our partnership in accordance with the limited partnership agreement. Less than $1 million in director fees were incurred during the year ended December 31, 2017 ( 2016 : less than $1 million , 2015 : less than $1 million ). For the year ended December 31, 2017 , payroll expense, including benefits at Brookfield Infrastructure’s subsidiaries was $519 million ( 2016 : $309 million , 2015 : $212 million ).

NON-WHOLLY OWNED SUBSIDIARIES

NON-WHOLLY OWNED SUBSIDIARIES	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
NON-WHOLLY OWNED SUBSIDIARIES	SUBSIDIARIES The following provides information about our partnership’s wholly-owned subsidiaries as of December 31, 2017 and 2016 : Ownership interest (%) Country of incorporation Defined Name Name of entity 2017 2016 Transport Australian rail operation Arc Infrastructure Holdings No. 1 Pty Ltd Australia 100 100 Energy Australian energy distribution operation Tas Gas Networks Pty Ltd Australia 100 100 The following table presents details of non-wholly owned subsidiaries of our partnership: Ownership Interest (%) Voting interest (%) Country of incorporation Defined Name Name of entity 2017 2016 2017 2016 Utilities U.K. regulated distribution operation BUUK Infrastructure Holdings Limited U.K. 80 80 80 80 Australian regulated terminal operation DBCT Management Pty Ltd (1) Australia 71 71 100 100 Colombian regulated distribution operation Empresa de Energia de Boyaca S.A. (1) Colombia 17 17 100 100 Brazilian regulated gas transmission operation Nova Transportadora do Sudeste (1),(2) Brazil 28 — 90 — Transport U.K. ports operation Brookfield Port Acquisitions (UK) Limited (1) U.K. 59 59 100 100 Australian ports operation Linx Cargo Care Group Pty Ltd (1),(3) Australia 27 27 67 67 Chilean toll roads Sociedad Concesionaria Vespucio Norte Express S.A. (1) Chile 51 51 89 89 Indian toll roads BIF India Holdings Pte Ltd (1),(4) Singapore 40 40 93 93 Peruvian toll roads Rutas de Lima S.A.C (1),(5) Peru 17 17 57 57 Energy North American gas storage operation (6) Warwick Gas Storage L.P. (1) Canada 25 25 100 100 Canadian district energy operation Enwave Energy Corporation (1) Canada 25 25 100 100 U.S. district energy operation Enwave USA (1) U.S. 40 40 100 100 North American gas storage operation (6) Lodi Gas Storage (1) U.S. 40 40 100 100 North American gas storage operation (6) Rockpoint Gas Storage Partners (1),(7) U.S. 40 40 100 100 Corporate & Other Holding LP Brookfield Infrastructure L.P. Bermuda 70 70 100 100 (1) For the above noted subsidiaries, our partnership has entered into voting arrangements to provide our partnership with the ability to direct the relevant activities of the investee. Our partnership controls these investees given that our partnership is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Our partnership exercises judgment to determine the level of variability that will achieve control over an investee, particularly in circumstances where our partnership’s voting interest differs from its ownership interest in an investee. The following were considered to determine whether our partnership controls these investees: the degree of power (if any) held by other investors, the degree of exposure to variability of each investor, the determination of whether any general partner removal rights are substantive and the purpose and design of the investee. (2) In April 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund (the “consortium”), acquired an effective 28% interest in Nova Transportadora do Sudeste S.A. (“NTS”), a Brazilian regulated gas transmission business, for total consideration of $1.6 billion . (3) In August 2016, Brookfield Infrastructure expanded its ports business to Australia as it acquired a 27% interest in Linx Cargo Care Group Pty Ltd through a Brookfield-sponsored infrastructure fund, along with institutional partners (the “Brookfield Consortium”) for total consideration of $145 million . (4) In March 2016 , Brookfield Infrastructure acquired a 40% interest in a toll road business in India from Gammon Infrastructure Projects Limited for consideration of $42 million through a Brookfield-sponsored infrastructure fund. (5) In June 2016 , Brookfield Infrastructure acquired a 17% interest in Rutas de Lima S.A.C. for total consideration of $127 million through a Brookfield-sponsored infrastructure fund. (6) North American gas storage operations include Warwick Gas Storage L.P., Lodi Gas Storage and Rockpoint Gas Storage Partners L.P. (7) In July 2016, Brookfield Infrastructure acquired a 40% interest in Rockpoint Gas Storage Partners L.P. for consideration of $227 million through a Brookfield-sponsored infrastructure fund. NON-WHOLLY OWNED SUBSIDIARIES The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Financial Position: As of December 31, 2017 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 107 $ 3,550 $ 281 $ 2,261 $ 217 $ 898 Australian regulated terminal 38 2,229 34 2,035 62 136 Colombian regulated distribution 68 764 26 438 302 66 Brazilian regulated gas transmission operation 322 5,990 73 2,015 3,081 1,143 Transport U.K. port operation 44 880 133 353 179 259 Australian port operation 163 628 101 218 346 126 Chilean toll roads 84 1,116 59 989 75 77 Peruvian toll roads 101 1,356 18 674 644 121 Indian toll roads 58 256 30 185 60 39 Energy North American gas storage operation 206 1,259 244 409 502 310 Canadian district energy operation 75 699 55 394 243 82 U.S. district energy operation 37 799 19 668 78 71 Corporate & Other Holding LP and other 127 244 392 2,060 84 (2,165 ) Total $ 1,430 $ 19,770 $ 1,465 $ 12,699 $ 5,873 $ 1,163 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. As of December 31, 2016 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 65 $ 2,985 $ 154 $ 1,919 $ 183 $ 794 Australian regulated terminal 27 2,162 (9 ) 1,926 70 202 Colombian regulated distribution 55 701 27 369 294 66 Transport U.K. port operation 42 754 108 324 150 214 Australian port operation 142 587 94 205 315 115 Chilean toll roads 102 1,069 50 941 89 91 Brazilian toll roads 42 466 27 — 189 292 Peruvian toll roads 127 1,261 27 635 610 116 Indian toll roads 52 264 36 186 58 36 Energy North American gas storage 199 1,141 136 478 452 274 Canadian district energy operation 15 570 13 290 209 73 U.S. district energy operation 43 697 62 537 73 68 Corporate & Other Holding LP and other 631 377 677 810 79 (558 ) Total $ 1,542 $ 13,034 $ 1,402 $ 8,620 $ 2,771 $ 1,783 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Operating Results: Year ended December 31, 2017 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 385 $ 21 $ 29 $ 114 $ 118 Australian regulated terminal operation 301 15 3 35 7 Colombian regulated distribution operation 161 12 38 2 7 Brazilian regulated gas transmission operation 938 349 (160 ) 146 (72 ) Transport U.K. port operation 180 8 21 22 29 Australian port operation 501 (7 ) 28 (3 ) 9 Chilean toll roads 154 — 7 — 8 Peruvian toll roads 103 12 22 2 5 Indian toll roads 57 (2 ) 4 (1 ) 3 Energy North American gas storage operation 149 30 74 18 47 Canadian district energy operation 95 (2 ) 39 — 13 U.S. district energy operation 131 10 40 7 26 Corporate & Other Holding LP and other 22 (3 ) 1 (349 ) (410 ) Total $ 3,177 $ 443 $ 146 $ (7 ) $ (210 ) Year ended December 31, 2016 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 347 $ 12 $ (14 ) $ 79 $ (55 ) Australian regulated terminal operation 299 15 (5 ) 46 (12 ) Colombian regulated distribution operation 150 10 45 2 10 Transport U.K. port operation 178 11 (37 ) 20 (52 ) Australian port operation 182 (18 ) (24 ) (7 ) (8 ) Chilean toll roads 127 (9 ) 7 (10 ) 8 Brazilian toll roads — 6 38 5 25 Peruvian toll roads 97 (8 ) (7 ) (2 ) (1 ) Indian toll roads 39 (3 ) 1 (3 ) — Energy North American gas storage operation 100 1 — 1 — Canadian district energy operation 79 (1 ) 31 1 11 U.S. district energy operation 111 (6 ) 31 — 20 Corporate & Other Holding LP and other 15 31 1 31 180 Total $ 1,724 $ 41 $ 67 $ 163 $ 126 Year ended December 31, 2015 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 339 $ 21 $ 25 $ 122 $ 101 Australian regulated terminal operation 330 15 (4 ) 68 (9 ) Colombian regulated distribution operation 152 13 (26 ) 16 (9 ) Transport U.K. port operation 220 7 13 22 18 Chilean toll roads 113 (7 ) (20 ) (15 ) (21 ) Energy North American gas storage operation 20 (8 ) 5 (12 ) 1 Canadian district energy operation 80 — 6 — 2 U.S. district energy operation 114 (6 ) 8 (3 ) 5 Corporate & Other Holding LP and other 21 55 (90 ) 5 (32 ) Total $ 1,389 $ 90 $ (83 ) $ 203 $ 56 The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Cash Flows: Cash Flow Activities Year ended December 31, 2017 Year ended December 31, 2016 US$ MILLIONS Operating Investing Financing Operating Investing Financing Utilities U.K. regulated distribution operation $ 220 $ (343 ) $ 129 $ 244 $ (487 ) $ 245 Australian regulated terminal operation 96 (9 ) (87 ) 128 (22 ) (106 ) Colombian regulated distribution operation 7 (22 ) 26 17 (18 ) — Brazilian regulated gas transmission operation 819 83 (839 ) — — — Transport U.K. port operation 46 (40 ) (10 ) 33 (24 ) (14 ) Australian port operation 37 (39 ) 12 7 (99 ) 154 Chilean toll roads 56 (5 ) (88 ) 63 (1 ) (99 ) Brazilian toll roads — — — 2 (70 ) 70 Peruvian toll roads 46 (67 ) — 29 25 1 Indian toll roads 30 (7 ) (22 ) (7 ) 28 (10 ) Energy North American gas storage operation 55 (9 ) (76 ) (12 ) 6 46 Canadian district energy operation 26 (82 ) 102 27 (18 ) (13 ) U.S. district energy operation 24 8 (28 ) 26 (33 ) 9 Corporate & Other Holding LP and other (98 ) (5,089 ) 4,721 124 (282 ) 618 Total $ 1,364 $ (5,621 ) $ 3,840 $ 681 $ (995 ) $ 901 Cash Flow Activities Year ended December 31, 2015 US$ MILLIONS Operating Investing Financing Utilities U.K. regulated distribution operation $ 164 $ (242 ) $ 92 Australian regulated terminal operation 103 (37 ) (67 ) New England electricity transmission operation 2 — (2 ) Colombian regulated distribution operation 16 (6 ) (7 ) Transport U.K. port operation 19 (66 ) 61 Australian port operation — — — Chilean toll roads 70 — (38 ) Energy North American gas storage operation (3 ) (1 ) 1 Canadian district energy operation 22 (16 ) (23 ) U.S. district energy operation 21 (13 ) (7 ) Corporate & Other Holding LP and other 92 (650 ) 554 Total $ 506 $ (1,031 ) $ 564

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2017
Income Taxes [Abstract]
Income Taxes	INCOME TAXES Our partnership is a flow through entity for tax purposes and as such is not subject to taxation. However, income taxes are recognized for the amount of taxes payable by the partnership’s corporate subsidiaries and for the impact of deferred tax assets and liabilities related to such subsidiaries. (a) Deferred Income Tax Balances The sources of deferred income tax balances are as follows: As of December 31 US$ MILLIONS 2017 2016 Deferred income tax assets Tax losses carried forward $ 361 $ 357 Financial instruments and other — 125 $ 361 $ 482 Deferred income tax liabilities Property, plant and equipment and investment properties $ (1,374 ) $ (1,306 ) Intangible assets (1,761 ) (714 ) Financial instruments and other $ (9 ) $ — $ (3,144 ) $ (2,020 ) Net deferred income tax liabilities $ (2,783 ) $ (1,538 ) Reflected in the statement of financial position as follows: Deferred income tax assets $ 66 $ 74 Deferred income tax liabilities (2,849 ) (1,612 ) Net deferred income tax liabilities $ (2,783 ) $ (1,538 ) The sources of deferred income tax balances and movements are as follows: Recognized in US$ MILLIONS Jan. 1, 2017 Net Income Other Comprehensive Income Other (1) Acquisitions (Dispositions) Dec. 31, 2017 Deferred income tax assets related to non-capital losses and capital losses $ 357 $ (19 ) $ — $ 23 $ — $ 361 Deferred income tax liabilities related to differences in tax and book basis, net (1,895 ) (48 ) (200 ) (71 ) (930 ) (3,144 ) Net deferred income tax liabilities $ (1,538 ) $ (67 ) $ (200 ) $ (48 ) $ (930 ) $ (2,783 ) Recognized in US$ MILLIONS Jan. 1, 2016 Net Income Other Comprehensive Income Other (1) Acquisitions (Dispositions) Dec. 31, 2016 Deferred income tax assets related to non-capital losses and capital losses $ 239 $ 17 $ — $ 4 $ 97 $ 357 Deferred income tax liabilities related to differences in tax and book basis, net (1,542 ) 1 (75 ) 52 (331 ) (1,895 ) Net deferred income tax liabilities $ (1,303 ) $ 18 $ (75 ) $ 56 $ (234 ) $ (1,538 ) (1) Other items relates to foreign exchange as deferred income taxes are calculated based on the functional currency of each operating entity. The amount of non-capital and capital losses and deductible temporary differences for which no deferred income tax assets have been recognized is approximately $859 million ( 2016 : $820 million ). Of the $859 million ( 2016 : $820 million ) deductible temporary differences not recognized, $480 million ( 2016 : $442 million ) relates to capital losses which carry forward indefinitely and have no expiry dates. The remaining $379 million ( 2016 : $378 million ) relates to non-capital losses, of which $7 million ( 2016 : $5 million ) expire between 2020 to 2030 and $372 million ( 2016 : $373 million ) that carry forward indefinitely and have no expiry dates. In 2016, as part of the acquisition of our Indian toll road business, a net deferred tax asset in respect of tax losses of $10 million was recognized. The benefit of these losses has been recognized based on management’s best estimate that it is considered probable that future taxable profits would be available against which such losses can be utilized. (b) Income Tax Recognized in Profit or Loss The major components of income tax expense include the following: For the year ended December 31, US$ MILLIONS 2017 2016 2015 Tax expense (recovery) comprises: Current income tax expense $ 106 $ 33 $ 22 Deferred income tax expense (recovery) Origination and reversal of temporary differences 92 (62 ) 4 Changes in tax rates or the imposition of new taxes (41 ) 1 (28 ) Previously unrecognized deferred taxes 16 43 (2 ) Total income tax expense (recovery) $ 173 $ 15 $ (4 ) Net income before income tax expense reconciles to income tax expense (recovery) as follows: Net income before income tax $ 747 $ 543 $ 387 Income tax expense calculated at the domestic rates applicable to profits in the country concerned 304 77 74 Change in substantively enacted tax rates (41 ) 1 (28 ) Earnings from investments in associates and joint ventures (12 ) (34 ) (16 ) Portion of gains subject to different tax rates 2 (54 ) 2 Taxable income attributable to non-controlling interests (65 ) (7 ) (25 ) International operations subject to different tax rates (39 ) (6 ) (8 ) Deferred tax assets not recognized 15 41 4 Permanent differences and other 9 (3 ) (7 ) Income tax expense (recovery) recognized in profit or loss $ 173 $ 15 $ (4 ) As the partnership is not subject to tax, the above reconciliation has been prepared using a composite statutory rate for jurisdictions where Brookfield Infrastructure’s subsidiaries operate. The composite rate has increased due to changes in the related operating income in the various subsidiaries and changes in local statutory rates. The partnership has approximately $2,411 million ( 2016 : $2,230 million ) of temporary differences associated with investments in subsidiaries, and associates for which no deferred income taxes have been provided. (c) Income Tax Recognized Directly in Other Comprehensive Income US$ MILLIONS 2017 2016 2015 Deferred income tax arising on income and expenses recognized in other comprehensive income: Revaluation of property, plant and equipment $ (204 ) $ (90 ) $ (130 ) Cash flow hedges 8 8 (15 ) Other (4 ) 7 4 Total income tax expense recognized directly in other comprehensive income $ (200 ) $ (75 ) $ (141 )

PARTNERSHIP CAPITAL

PARTNERSHIP CAPITAL	12 Months Ended
	Dec. 31, 2017
Equity [abstract]
PARTNERSHIP CAPITAL	PARTNERSHIP CAPITAL As at December 31, 2017 , our partnership’s capital structure was comprised of three classes of partnership units: units, preferred units and general partnership units. Units entitle the holder to their proportionate share of distributions. Preferred units entitle the holder to cumulative preferential cash distributions in accordance with their terms. General partnership units entitle the holder the right to govern the financial and operating policies of our partnership. The Holding LP’s capital structure is composed of four classes of partnership units: Special General Partner Units, Holding LP Class A Preferred Units, Managing General Partner Units and Redeemable Partnership Units held by Brookfield. In its capacity as the holder of the Special General Partner Units of the Holding LP, the special general partner is entitled to incentive distribution rights which are based on the amount by which quarterly distributions on the Holding LP’s units (other than Holding LP Class A Preferred Units) exceed specified target levels. To the extent distributions on the Holding LP’s units (other than Holding LP Class A Preferred Units) exceed $0.203 per quarter, the incentive distribution rights entitle the special general partner to 15% of incremental distributions above this threshold. To the extent that distributions on the Holding LP’s units (other than Holding LP Class A Preferred Units) exceed $0.22 per unit, the incentive distribution rights entitle the special general partner to 25% of incremental distributions above this threshold. During the year, the Holding LP paid incentive distributions of $113 million ( 2016 : $80 million , 2015 : $64 million ). The Holding LP has issued 115.8 million Redeemable Partnership Units to Brookfield, which may, at the request of the holder, require the Holding LP to redeem the Redeemable Partnership Units for cash in an amount equal to the market value of our units. This right is subject to our partnership’s right of first refusal which entitles it, at its sole discretion, to elect to acquire any Redeemable Partnership Units so presented to the Holding LP in exchange for one of our partnership’s units (subject to certain customary adjustments). Both the units issued by our partnership and the Redeemable Partnership Units issued by the Holding LP have the same economic attributes in all respects, except for the redemption right described above. The Redeemable Partnership Units participate in earnings and distributions on a per Redeemable Partnership Unit basis equivalent to the per unit participation of the units of our partnership. Our partnership reflects the Redeemable Partnership Units issued to Brookfield by the Holding LP as non-controlling interest–Redeemable Partnership Units held by Brookfield. On September 14, 2016 , our partnership completed a three-for-two split of its units by way of a subdivision of units, whereby unitholders received an additional one-half of a unit for each unit held, resulting in the issuance of approximately 115 million additional units. Any fractional units otherwise issuable to registered holders as a result of the Unit Split were rounded up to the nearest whole unit. Our preferred units were not affected by the Unit Split. The Managing General Partner Units, Special General Partner Units and Redeemable Partnership Units of the Holding LP were concurrently split to reflect the Unit Split. (a) Special and Limited Partnership Capital Special General Partner Units Limited Partnership Units Total UNITS MILLIONS 2017 2016 2015 2017 2016 2015 2017 2016 2015 Opening balance 1.6 1.6 1.6 259.4 243.2 225.5 261.0 244.8 227.1 Issued for cash — — — 17.2 16.4 20.2 17.2 16.4 20.2 Repurchased and cancelled — — — — (0.2 ) (2.5 ) — (0.2 ) (2.5 ) Ending balance 1.6 1.6 1.6 276.6 259.4 243.2 278.2 261.0 244.8 Special General Partner Limited Partners Total US$ MILLIONS 2017 2016 2015 2017 2016 2015 2017 2016 2015 Opening balance $ 19 $ 19 $ 19 $ 4,215 $ 3,716 $ 3,201 $ 4,234 $ 3,735 $ 3,220 Unit issuance — — — 692 505 582 692 505 582 Repurchased and cancelled — — — — (6 ) (67 ) — (6 ) (67 ) Ending balance $ 19 $ 19 $ 19 $ 4,907 $ 4,215 $ 3,716 $ 4,926 $ 4,234 $ 3,735 In September 2017, Brookfield Infrastructure issued 16.6 million limited partnership units at $42 per unit under shelf registrations in the U.S. and Canada. In total, $700 million of gross proceeds were raised through the issuance and $28 million in equity issuance costs were incurred. Concurrently, Brookfield Infrastructure issued 7.4 million Redeemable Partnership Units to Brookfield for proceeds of $300 million . As Brookfield participated in the unit offering at a percentage greater than its ownership interest in the Holding LP prior to the equity offering, this resulted in a slight decrease in our partnership’s ownership interest in the Holding LP without resulting in a loss of control. The difference between the proportionate amount by which the non-controlling interest in Holding LP was increased and the proceeds of the Redeemable Partnership Unit offering resulted in a gain of $6 million that was recognized directly in equity. The gain on changes in ownership interest recognized in equity is recorded as ownership changes within the Statements of Partnership Capital. Amounts in accumulated other comprehensive income at the date of the unit offering that were attributable to the limited partners were ratably allocated to accumulated other comprehensive income attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield. In December 2016, Brookfield Infrastructure issued 15.6 million limited partnership units at $32 per unit under shelf registrations in the U.S. and Canada. In total, $500 million of gross proceeds were raised through the issuance and $20 million in equity issuance costs were incurred. Concurrently, Brookfield Infrastructure issued 8.1 million Redeemable Partnership Units to Brookfield for proceeds of $250 million . The difference between the proportionate amount by which the non-controlling interest in Holding LP was increased and the proceeds of the Redeemable Partnership Unit offering resulted in a gain of $16 million that was recognized directly in equity. During the year ended December 31, 2016 , Brookfield Infrastructure repurchased and cancelled less than 1 million units for $6 million (2015: 2.5 million units for $67 million ) and incurred less than $1 million in commission costs (2015: less than $ 1 million ). No units were repurchased or cancelled in 2017. In April 2015, Brookfield Infrastructure issued approximately 20 million units at $30 per unit under shelf registrations in the U.S. and Canada. In total, $600 million of gross proceeds were raised through the issuance and $24 million in equity issuance costs were incurred. In June 2010 , we implemented a distribution reinvestment plan (the “Plan”) that allows eligible holders of our partnership to purchase additional units by reinvesting their cash distributions. Under the Plan, units are acquired at a price per unit calculated by reference to the volume weighted average of the trading price for our units on the New York Stock Exchange for the five trading days immediately preceding the relevant distribution date. During the year, our partnership issued less than 1 million units for proceeds of $20 million ( 2016 : less than 1 million units for proceeds of $25 million , 2015 : less than 1 million units for proceeds of $6 million ) under the Plan. The weighted average number of Special General Partner Units outstanding for the year ended December 31, 2017 was 1.6 million ( 2016 : 1.6 million , 2015 : 1.6 million ). The weighted average number of limited partnership units outstanding for the year ended December 31, 2017 was 264.6 million ( 2016 : 244.7 million , 2015 : 238.9 million ). (b) Non-controlling interest—Redeemable Partnership Units held by Brookfield Non-controlling interest— Redeemable Partnership Units held by Brookfield UNITS MILLIONS 2017 2016 2015 Opening balance 108.4 100.3 88.1 Issued for cash 7.4 8.1 12.2 Ending balance 115.8 108.4 100.3 Non-controlling interest— Redeemable Partnership Units held by Brookfield US$ MILLIONS 2017 2016 2015 Opening balance $ 1,778 $ 1,528 $ 1,178 Unit issuance 300 250 350 Ending balance $ 2,078 $ 1,778 $ 1,528 In September 2017, Brookfield Infrastructure issued 7.4 million Redeemable Partnership Units to Brookfield for proceeds of $300 million . In December 2016 , Brookfield Infrastructure issued 8.1 million Redeemable Partnership Units to Brookfield for proceeds of $250 million . In April 2015, Brookfield Infrastructure issued 12.2 million Redeemable Partnership Units to Brookfield for proceeds of $350 million . The weighted average number of Redeemable Partnership Units outstanding for the year ended December 31, 2017 was 110.6 million ( 2016 : 100.9 million , 2015 : 96.9 million ). (c) Preferred Unitholders’ Capital Preferred Units UNITS MILLIONS 2017 2016 2015 Opening balance 20.0 10.0 — Issued for cash 12.0 10.0 10.0 Ending balance 32.0 20.0 10.0 Preferred Units US$ MILLIONS 2017 2016 2015 Opening balance $ 375 $ 189 $ — Unit issuance 220 186 189 Ending balance $ 595 $ 375 $ 189 S ubsequent to year end, on January 23, 2018, our partnership issued 8 million Series 9 Preferred Units at C $25 per unit with a quarterly fixed distribution at a rate of 5.00% annually for the initial period ending March 31, 2023. In total, C$200 million or $161 million of gross proceeds were raised, $4 million in underwriting costs were incurred and less than $1 million in issuance costs were incurred. On January 26, 2017 , our partnership issued 12 million Series 7 Preferred Units at C $25 per unit with a quarterly fixed distribution at a rate of 5.00% annually for the initial period ending March 31, 2022 . In total, C $300 million or $225 million of gross proceeds were raised, $5 million in underwriting costs were incurred and less than $1 million in issuance costs were incurred. In August 2016 , our partnership issued ten million Series 5 Preferred Units at C $25 per unit with a quarterly fixed distribution at a rate of 5.35% annually for the initial period ending September 30, 2021 . In total, C $250 million or $190 million of gross proceeds were raised and $4 million in issuance costs were incurred. In December 2015 , our partnership issued five million Series 3 Preferred Units at C $25 per unit with a quarterly fixed distribution at a rate of 5.50% annually for the initial period ending December 31, 2020 . In total, C $125 million or $95 million of gross proceeds were raised and $2 million in issuance costs were incurred. In March 2015 , our partnership issued five million Series 1 Preferred Units at C $25 per unit with a quarterly fixed distribution at a rate of 4.50% annually for the initial period ending June 30, 2020 . In total, C $125 million or $100 million of gross proceeds were raised and $4 million in issuance costs were incurred.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME	12 Months Ended
	Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME (a) Attributable to Limited Partners’ US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 1,042 $ (889 ) $ 99 $ (140 ) $ (9 ) $ (13 ) $ 465 $ 555 Other comprehensive income (loss) 93 (5 ) 117 9 5 (17 ) 156 358 Other items (note 26) (178 ) 3 (1 ) 1 — — (2 ) (177 ) Balance at December 31, 2016 $ 957 $ (891 ) $ 215 $ (130 ) $ (4 ) $ (30 ) $ 619 $ 736 Other comprehensive income (loss) 19 56 (187 ) 104 4 3 129 128 Balance at December 31, 2017 $ 976 $ (835 ) $ 28 $ (26 ) $ — $ (27 ) $ 748 $ 864 (b) Attributable to General Partner US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 7 $ (5 ) $ 1 $ (1 ) $ — $ — $ 2 $ 4 Other comprehensive income (loss) 1 — 2 — — — 1 4 Other items (note 26) (1 ) — — — — — — (1 ) Balance at December 31, 2016 $ 7 $ (5 ) $ 3 $ (1 ) $ — $ — $ 3 $ 7 Other comprehensive income (loss) — (1 ) (2 ) 1 — — 1 (1 ) Balance at December 31, 2017 $ 7 $ (6 ) $ 1 $ — $ — $ — $ 4 $ 6 (c) Attributable to Non-controlling interest—Redeemable Partnership Units held by Brookfield US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 447 $ (358 ) $ 38 $ (61 ) $ (4 ) $ (2 ) $ 194 $ 254 Other comprehensive income (loss) 38 (4 ) 49 4 2 (7 ) 65 147 Other items (note 26) (68 ) (3 ) 1 (1 ) (1 ) — 2 (70 ) Balance at December 31, 2016 $ 417 $ (365 ) $ 88 $ (58 ) $ (3 ) $ (9 ) $ 261 $ 331 Other comprehensive income (loss) 8 26 (77 ) 44 1 1 53 56 Balance at December 31, 2017 $ 425 $ (339 ) $ 11 $ (14 ) $ (2 ) $ (8 ) $ 314 $ 387

DISTRIBUTIONS

DISTRIBUTIONS	12 Months Ended
	Dec. 31, 2017
Distributions [Abstract]
DISTRIBUTIONS	DISTRIBUTIONS For the year ended December 31, 2017 , distributions to partnership unitholders were $651 million or $1.74 per unit ( 2016 : $535 million or $1.55 per unit, 2015 : $479 million or $1.41 per unit). Additionally, incentive distributions were made to the special general partner of $113 million ( 2016 : $80 million , 2015 : $64 million ). On February 8, 2018 the Board of Directors of our General Partner approved an 8% increase in our quarterly distribution to $0.47 per unit, payable on March 31, 2018 to unitholders on record as of the close of business on February 28, 2018 . For the year ended December 31, 2017 , our partnership declared preferred unit distributions of $30 million or $0.94 per preferred unit ( 2016 : $13 million , 2015 : $ 3 million ).

CONTINGENT ASSETS & LIABILITIES

CONTINGENT ASSETS & LIABILITIES	12 Months Ended
	Dec. 31, 2017
Other Provisions, Contingent Liabilities and Contingent Assets [Abstract]
CONTINGENT ASSETS & LIABILITIES	CONTINGENT ASSETS & LIABILITIES Brookfield Infrastructure, including its associates, had bank and customs guarantees and letters of credit outstanding to third parties totaling $182 million ( 2016 : $141 million ). These guarantees are generally supported by cash on deposit with banks. Our partnership and its subsidiaries are contingently liable with respect to litigation and claims that arise in the normal course of operations.

CONTRACTUAL COMMITMENTS

CONTRACTUAL COMMITMENTS	12 Months Ended
	Dec. 31, 2017
Contractual Commitments [Abstract]
CONTRACTUAL COMMITMENTS	CONTRACTUAL COMMITMENTS In the normal course of business, our partnership will enter into contractual obligations which include commitments relating primarily to contracted project costs for various growth initiatives, committed expenditures associated with gas and electricity sales contracts at our U.K. regulated distribution operation, and operating leases associated with our North American gas storage operations. As at December 31, 2017 , our partnership had $1,448 million ( 2016 : $1,201 million ) of commitments outstanding, of which 32% mature in less than one year, 42% between two and five years, and 26% after five years. In addition, pursuant to the Master Service Agreement, on a quarterly basis, Brookfield Infrastructure pays a base management fee to the Service Provider equal to 0.3125% per quarter ( 1.25% annually) of the market value of our partnership. This fee is recorded on the Consolidated Statements of Operating Results in general and administrative expenses.

RETIREMENT BENEFIT PLANS

RETIREMENT BENEFIT PLANS	12 Months Ended
	Dec. 31, 2017
Employee Benefits [Abstract]
RETIREMENT BENEFIT PLANS	RETIREMENT BENEFIT PLANS Brookfield Infrastructure offers pension plans to certain employees of its subsidiaries. Brookfield Infrastructure’s obligations under its defined benefit pension plans are determined periodically through the preparation of actuarial valuations. The benefit plans’ expense for 2017 was $10 million ( 2016 : $7 million , 2015 : less than $1 million ). The discount rate used was 4.1% ( 2016 : 4.2% , 2015 : 6.1% ) with a rate of compensation of 3.5% ( 2016 : 3.5% , 2015 : 3.3% ). US$ MILLIONS 2017 2016 Plan assets $ 228 $ 198 Less accrued benefit obligation (328 ) (296 ) Accrued benefit liability $ (100 ) $ (98 )

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2017
Related Party [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS In the normal course of operations, Brookfield Infrastructure entered into the transactions below with related parties. The immediate parent of Brookfield Infrastructure is our partnership. The ultimate parent of Brookfield Infrastructure is Brookfield. Other related parties of Brookfield Infrastructure represent its subsidiary and operating entities. a) Transactions with the immediate parent Throughout the year, the General Partner, in its capacity as our partnership’s general partner, incurs director fees, a portion of which are charged at cost to our partnership in accordance with the limited partnership agreement. Less than $1 million in director fees were incurred during the year ended December 31, 2017 ( 2016 : less than $1 million , 2015 : less than $1 million ). b) Transactions with other related parties Since inception, Brookfield Infrastructure has been party to the Master Services Agreement with the Service Provider. Pursuant to the Master Services Agreement, on a quarterly basis, Brookfield Infrastructure pays a base management fee, referred to as the Base Management Fee, to the Service Provider equal to 0.3125% per quarter ( 1.25% annually) of the market value of our partnership. The Base Management Fee was $230 million for the year ended December 31, 2017 ( 2016 : $158 million , 2015 : $126 million ). As of December 31, 2017, $64 million was outstanding as payable to the Service Provider (2016: $42 million ). For purposes of calculating the Base Management Fee, the market value of our partnership is equal to the aggregate value of all the outstanding units of our partnership (assuming full conversion of Brookfield’s Redeemable Partnership Units in the Holdings LP into units of our partnership), preferred units and securities of the other Service Recipients (as defined in Brookfield Infrastructure’s Master Services Agreement) that are not held by Brookfield Infrastructure, plus all outstanding third party debt with recourse to a Service Recipient, less all cash held by such entities. During the year ended December 31, 2017, $6 million was reimbursed at cost to the Service Provider (2016: $5 million , 2015: $8 million ). These amounts represent third party costs that were paid for by Brookfield on behalf of Brookfield Infrastructure relating to general and administrative expenses, and acquisition related expenses of Brookfield Infrastructure. These expenses were charged to Brookfield Infrastructure at cost. As of December 31, 2017, Brookfield Infrastructure had a balance receivable of $20 million from subsidiaries of Brookfield (December 31, 2016: $20 million ) and loans payable of $75 million to subsidiaries of Brookfield (December 31, 2016: $75 million ). The loans are payable in full between 2018 and 2026 with interest rates ranging from 3.8% to 8.5% per annum. Brookfield Infrastructure, from time to time, will place or receive funds on deposit with or from Brookfield. As at December 31, 2017 , Brookfield Infrastructure’s deposit balance with Brookfield was less than $1 million ( December 31, 2016 : $255 million ) and earned interest of $1 million for year ended December 31, 2017 ( 2016 : less than $1 million , 2015 : less than $1 million ). Brookfield Infrastructure’s North American district energy operation provides heating and cooling services and leases office space on market terms with subsidiaries of Brookfield Office Properties Inc. The North American district energy operation also utilizes consulting and engineering services provided by a wholly-owned subsidiary of Brookfield on market terms. For the year ended December 31, 2017 , revenues of $8 million were generated ( 2016 : $1 million , 2015 : less than $1 million ) and expenses of $4 million were incurred ( 2016 : less than $1 million , 2015 : less than $1 million ). Brookfield Infrastructure utilizes a wholly-owned subsidiary of Brookfield to negotiate and purchase insurance and assess the adequacy of insurance on behalf of our partnership and certain subsidiaries. During the year ended December 31, 2017 , Brookfield Infrastructure paid less than $1 million for these services ( 2016 : less than $1 million , 2015 : less than $1 million ). Brookfield Infrastructure’s U.K. port operation provides port marine services on market terms to a subsidiary acquired by Brookfield Business Partners LP during 2017. For the year ended December 31, 2017, $2 million of revenues were generated.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS Brookfield Infrastructure’s activities expose it to a variety of financial risks, including market risk (i.e. currency risk, interest rate risk, commodity risk and other price risk), credit risk and liquidity risk. Brookfield Infrastructure and its subsidiaries selectively use derivative financial instruments principally to manage these risks. The aggregate notional amount of Brookfield Infrastructure’s derivative positions at December 31, 2017 and 2016 were as follows: US$ MILLIONS Note 2017 2016 Foreign exchange contracts (a) $ 3,816 $ 4,488 Interest rates swaps and other (b) 5,013 4,416 $ 8,829 $ 8,904 The following table presents the change in fair values of Brookfield Infrastructure’s derivative positions during the years ended December 31, 2017 and 2016 : US$ MILLIONS Unrealized Gains on Derivative Financial Assets Unrealized Losses on Derivative Financial Liabilities Net Change During 2017 Net Change During 2016 Foreign exchange derivatives $ — $ (305 ) $ (305 ) $ 97 Interest rate derivative 132 (69 ) 63 15 $ 132 $ (374 ) $ (242 ) $ 112 (a) Foreign Exchange Brookfield Infrastructure held the following foreign exchange contracts with notional amounts at December 31, 2017 and 2016 . Notional Amount (U.S. Dollars) Average Exchange Rate US$ MILLIONS 2017 2016 2017 2016 Foreign exchange contracts Australian dollars $ 1,214 $ 2,133 0.74 0.73 British pounds 2,069 1,810 1.30 1.30 European Union euros 491 374 1.17 1.14 Brazilian reais — 144 — 3.37 Canadian dollars 42 27 0.77 0.76 $ 3,816 $ 4,488 (b) Interest Rates At December 31, 2017 , Brookfield Infrastructure held interest rate and cross currency interest rate swap contracts having an aggregate notional amount of $4,843 million ( 2016 : $4,261 million ). Brookfield Infrastructure has inflation linked swaps with an aggregate notional amount of $170 million ( 2016 : $155 million ). Other Information Regarding Derivative Financial Instruments The following table presents the notional amounts underlying Brookfield Infrastructure’s derivative instruments by term to maturity as at December 31, 2017 and the comparative notional amounts at December 31, 2016 , for both derivatives that are classified as fair value through profit or loss and derivatives that qualify for hedge accounting: 2017 2016 US$ MILLIONS < 1 year 1 to 5 years > 5 years Total Notional Amount Total Notional Amount Fair value through profit or loss Foreign exchange derivatives $ 640 $ 807 $ — $ 1,447 $ 1,351 Interest rate derivatives Interest rate and cross currency interest rate swaps 273 484 59 816 752 Inflation linked swaps — — 170 170 155 $ 913 $ 1,291 $ 229 $ 2,433 $ 2,258 Elected for hedge accounting Foreign exchange derivatives $ 1,788 $ 581 $ — $ 2,369 $ 3,136 Interest rate derivatives Interest rate and cross currency interest rate swaps 99 2,051 1,877 4,027 3,509 $ 1,887 $ 2,632 $ 1,877 $ 6,396 $ 6,645 The following table classifies derivatives elected for hedge accounting during the years ended December 31, 2017 and 2016 as either cash flow hedges or net investment hedges. Changes in the fair value of the effective portion of the hedges are recorded in either other comprehensive income or net income, depending on the hedge classification, whereas changes in the fair value of the ineffective portion of the hedge are recorded in net income: 2017 2016 AS AT AND FOR THE YEARS ENDED (MILLIONS) Notional Effective Portion Ineffective Portion Notional Effective Portion Ineffective Portion Cash flow hedges $ 4,027 $ 15 $ — $ 3,509 $ 30 $ 1 Net investment hedges 2,369 (197 ) — 3,136 53 — $ 6,396 $ (182 ) $ — $ 6,645 $ 83 $ 1 Our partnership settles the difference between the contracted fixed and floating rates of its interest rate swaps on a net basis. All interest rate swap contracts exchanging floating rate interest amounts for fixed rate interest amounts are designated as cash flow hedges in order to reduce our partnership’s cash flow exposure resulting from variable interest rates on borrowings. The interest rate swaps and the interest payments on the borrowings occur simultaneously and the amount accumulated in equity is reclassified to profit or loss over the period that the floating rate interest payments on borrowings affect profit or loss.

FINANCIAL RISK MANAGEMENT

FINANCIAL RISK MANAGEMENT	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
FINANCIAL RISK MANAGEMENT	FINANCIAL RISK MANAGEMENT Brookfield Infrastructure is exposed to the following risks as a result of holding financial instruments: capital risk; liquidity risk; market risk (i.e. interest rate risk and foreign currency risk); and credit risk. The following is a description of these risks and how they are managed: (a) Liquidity Risk Management Brookfield Infrastructure manages its capital structure to be able to continue as a going concern while maximizing the return to stakeholders. Brookfield Infrastructure’s overall capital strategy remains unchanged from 2016 . The capital structure of Brookfield Infrastructure consists of debt, offset by cash and cash equivalents, and partnership capital comprised of issued capital and accumulated gains. US$ MILLIONS 2017 2016 Subsidiary and corporate borrowings $ 10,164 $ 8,326 Preferred shares 20 20 Cash and cash equivalents (1) (459 ) (789 ) Net debt 9,725 7,557 Total partnership capital 13,474 9,644 Total capital and net debt $ 23,199 $ 17,201 Net debt to capitalization ratio 42 % 44 % (1) Includes marketable securities. The Board, along with senior management of the Service Provider, reviews Brookfield Infrastructure’s capital structure and as part of this review, considers the cost of capital and the risk associated with each class of capital. Brookfield Infrastructure manages its debt exposure by financing its operations on a non-recourse basis with prudent levels of debt, ensuring a diversity of funding sources as well as laddering its maturity profile to minimize refinance risk. Brookfield Infrastructure also borrows in the currency where the asset operates, where possible, in order to hedge its currency risk. Generally, Brookfield Infrastructure’s equity strategy is to issue equity in conjunction with acquisitions or outsized organic growth initiatives at our businesses. However, Brookfield Infrastructure may also issue equity opportunistically to enhance its liquidity to pursue investments. Brookfield Infrastructure maintains active shelf registrations to enable it to issue securities in both the U.S. and Canadian markets. Brookfield Infrastructure’s financing plan is to fund its recurring growth capital expenditures with cash flow generated by its operations after maintenance capital expenditure, as well as debt financing that is sized to maintain its credit profile. To fund large scale development projects and acquisitions, Brookfield Infrastructure will evaluate a variety of capital sources including proceeds from selling non-core assets, equity and debt financing. Our partnership will seek to raise additional equity if Brookfield Infrastructure believes it can earn returns on these investments in excess of the cost of the incremental partnership capital. As disclosed within Note 18 , Borrowings, Brookfield Infrastructure has various loan facilities in place. In certain cases, the facilities have financial covenants which are generally in the form of interest coverage ratios and leverage ratios. Brookfield Infrastructure does not have any market capitalization covenants attached to any of its borrowings, nor does it have any other externally imposed capital requirements. During the years ended December 31, 2017 and 2016 , there were no breaches of any loan covenants within Brookfield Infrastructure. Brookfield Infrastructure attempts to maintain sufficient financial liquidity at all times so that it is able to participate in attractive opportunities as they arise, better withstand sudden adverse changes in economic circumstances and maintain its distribution of FFO to unitholders. Brookfield Infrastructure’s principal sources of liquidity are cash flows from its operations, undrawn credit facilities and access to public and private capital markets. Brookfield Infrastructure also structures the ownership of its assets to enhance its ability to monetize them to provide additional liquidity, if necessary. Brookfield Infrastructure’s corporate liquidity as at December 31 was as follows: US$ MILLIONS (1) 2017 2016 Corporate cash and financial assets $ 205 $ 549 Availability under committed credit facilities 2,475 2,475 Draws on credit facility (789 ) — Commitments under credit facility (106 ) (46 ) Corporate liquidity $ 1,785 $ 2,978 (1) Corporate level only. Brookfield Infrastructure’s $1.975 billion committed revolving credit facility and $500 million credit facility with Brookfield are available for investments and acquisitions, as well as general corporate purposes. Commitments under the committed revolving credit facility will be available on a revolving basis until June 30, 2022 . All amounts outstanding at that time will be repayable in full. The facility is intended to be a bridge to equity financing rather than a permanent source of capital. At December 31, 2017 , there was $789 million drawn on this facility ( 2016 : $ nil ) and $106 million was committed to letters of credit ( 2016 : $46 million ). Subsequent to December 31, 2017, we cancelled letters of credit issued by our subsidiaries which amounted to $59 million . The following tables detail the contractual maturities for Brookfield Infrastructure’s financial liabilities. The tables reflect the undiscounted cash flows of financial liabilities based on the earliest date on which Brookfield Infrastructure can be required to pay. The tables include both interest and principal cash flows: Less than 1 year 1-2 years 2-5 years 5+ years Total contractual cash flows December 31, 2017 US$ MILLIONS Accounts payable and other liabilities $ 646 $ 45 $ 59 $ 293 $ 1,043 Corporate borrowings 99 — 1,445 557 2,101 Non-recourse borrowings 372 571 2,043 5,101 8,087 Financial liabilities 237 58 930 88 1,313 Interest Expense: Corporate borrowings 49 47 106 25 227 Non-Recourse borrowings 381 348 864 1,343 2,936 Less than 1 year 1-2 years 2-5 years 5+ years Total contractual cash flows December 31, 2016 US$ MILLIONS Accounts payable and other liabilities $ 540 $ 34 $ 26 $ 186 $ 786 Corporate borrowings 295 93 279 335 1,002 Non-recourse borrowings 286 233 1,708 5,109 7,336 Financial liabilities 229 29 49 74 381 Interest Expense: Corporate borrowings 40 29 64 14 147 Non-recourse borrowings 361 342 871 1,450 3,024 (b) Market Risk Market risk is defined for these purposes as the risk that the fair value or future cash flows of a financial instrument held by Brookfield Infrastructure will fluctuate because of the change in market prices. Market risk includes the risk of changes in interest rates, foreign currency exchange rates and equity prices. Brookfield Infrastructure seeks to minimize the risks associated with foreign currency exchange rates and interest rates primarily through the use of derivative financial instruments to hedge these risk exposures. The use of financial derivatives is governed by Brookfield Infrastructure’s Treasury Policy. Brookfield Infrastructure does not enter into, or trade financial instruments, including derivative financial instruments, for speculative purposes. The Treasury Policy provides written principles on the use of financial derivatives. With respect to its treasury policy, the Service Provider performs the monitoring, review and approval role and report to the Board on a regular basis. Financial instruments held by Brookfield Infrastructure that are subject to market risk include other financial assets, borrowings, derivative instruments, such as interest rate and foreign currency contracts, and marketable securities. Our partnership is exposed to equity price risks arising from marketable securities. As at December 31, 2017 the balance of the portfolio was $85 million ( 2016 : $3 million ), a 10% change in the value of the portfolio would impact our equity by $9 million and result in an impact on the Consolidated Statement of Comprehensive Income of $9 million . Interest Rate Risk Management Brookfield Infrastructure’s primary objectives with respect to interest rate risk management are to ensure that: • Brookfield Infrastructure is not exposed to interest rate movements that could adversely impact its ability to meet financial obligations; • Earnings and distributions are not adversely affected; • Volatility of debt servicing costs is managed within acceptable parameters; and • All borrowing covenants under various borrowing facilities, including interest coverage ratios, are complied with. To achieve these objectives, in general terms, Brookfield Infrastructure’s funding mix comprises both fixed and floating rate debt. Fixed rate debt is achieved either through fixed rate debt funding or through the use of financial derivate instruments. In addition, where possible, interest rate risk is minimized by matching the terms of interest rate swap contracts in regulated businesses to the term of the rate period, thus providing natural hedges. The sensitivity analyses below reflect Brookfield Infrastructure’s exposure to interest rates for both derivative and non-derivative instruments at the reporting date, assuming that a 10 basis point increase or decrease in rates takes place at the beginning of the financial year and is held constant throughout the reporting period. The sensitivity analyses assume a 10 basis point change to reflect the current methodology employed by Brookfield Infrastructure in assessing interest rate risk. Such parallel shift in the yield curve by 10 basis points would have had the following impact, assuming all other variables were held constant: 2017 2016 2015 US$ MILLIONS 10 bp decrease 10 bp increase 10 bp decrease 10 bp increase 10 bp decrease 10 bp increase Net income (loss) $ — $ — $ 1 $ (1 ) $ 2 $ (2 ) Other comprehensive (loss) income (1 ) 1 (1 ) 1 (2 ) 2 Foreign Currency Risk Management Brookfield Infrastructure has exposure to foreign currency risk in respect of currency transactions, the value of Brookfield Infrastructure’s net investment, cash flows and capital expenditures that are denominated outside of the U.S. Brookfield Infrastructure’s approach to foreign currency risk management is: • Brookfield Infrastructure leverages any natural hedges that may exist within its operations; • Brookfield Infrastructure utilizes local currency debt financing to the extent possible; and • Brookfield Infrastructure may utilize derivative contracts to the extent that natural hedges are insufficient. The tables below set out Brookfield Infrastructure’s currency exposure at December 31, 2017 , 2016 and 2015 : 2017 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP PEN INR NZD Total Assets: Current assets $ 358 $ 276 $ 151 $ 322 $ 85 $ 78 $ — $ 68 $ 100 $ 57 $ 17 $ 1,512 Non-current assets 4,400 5,770 4,431 8,184 1,117 814 836 764 1,356 256 37 27,965 $ 4,758 $ 6,046 $ 4,582 $ 8,506 $ 1,202 $ 892 $ 836 $ 832 $ 1,456 $ 313 $ 54 $ 29,477 Liabilities: Current liabilities $ 641 $ 227 $ 414 $ 73 $ 59 $ 55 $ — $ 26 $ 18 $ 30 $ 21 $ 1,564 Non-current liabilities 3,093 3,983 2,614 2,015 989 443 — 438 673 185 6 14,439 3,734 4,210 3,028 2,088 1,048 498 — 464 691 215 27 16,003 Non-controlling interest—in operating subsidiaries and preferred unitholders 602 417 396 3,082 75 891 — 302 644 60 1 6,470 Non-controlling interest—Redeemable Partnership Units held by Brookfield (50 ) 407 332 959 23 28 240 19 35 11 8 2,012 Net investment $ 472 $ 1,012 $ 826 $ 2,377 $ 56 $ (525 ) $ 596 $ 47 $ 86 $ 27 $ 18 $ 4,992 2016 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP PEN INR NZD Total Assets: Current assets $ 849 $ 214 $ 127 $ 42 $ 102 $ 18 $ — $ 55 $ 127 $ 52 $ 46 $ 1,632 Non-current assets 3,744 5,542 3,739 1,895 1,070 677 718 700 1,260 265 33 19,643 $ 4,593 $ 5,756 $ 3,866 $ 1,937 $ 1,172 $ 695 $ 718 $ 755 $ 1,387 $ 317 $ 79 $ 21,275 Liabilities: Current liabilities $ 833 $ 206 $ 262 $ 23 $ 50 $ 35 $ — $ 27 $ 27 $ 36 $ 16 $ 1,515 Non-current liabilities 1,636 3,764 2,243 — 941 309 — 369 636 186 32 10,116 2,469 3,970 2,505 23 991 344 — 396 663 222 48 11,631 Non-controlling interest—in operating subsidiaries and preferred unitholders 919 370 333 189 89 261 — 294 610 58 23 3,146 Non-controlling interest—Redeemable Partnership Units held by Brookfield 344 405 294 493 26 26 206 19 33 11 3 1,860 Net investment $ 861 $ 1,011 $ 734 $ 1,232 $ 66 $ 64 $ 512 $ 46 $ 81 $ 26 $ 5 $ 4,638 2015 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP Total Assets: Current assets $ 234 $ 380 $ 470 $ 6 $ 126 $ 291 $ — $ 46 $ 1,553 Non-current assets 2,485 5,816 3,927 1,020 1,052 636 618 629 16,182 $ 2,719 $ 6,196 $ 4,397 $ 1,026 $ 1,178 $ 927 $ 618 $ 675 $ 17,735 Liabilities: Current liabilities $ 502 $ 103 $ 434 $ — $ 30 $ 122 $ — $ 20 $ 1,210 Non-current liabilities 1,714 3,745 2,312 — 902 334 — 342 9,349 2,216 3,848 2,746 — 932 456 — 362 10,559 Non-controlling interest—in operating subsidiaries and preferred unitholders 377 269 385 141 121 248 — 256 1,797 Non-controlling interest—Redeemable Partnership Units held by Brookfield 36 587 357 249 35 63 175 16 1,518 Net investment $ 90 $ 1,492 $ 909 $ 636 $ 90 $ 160 $ 443 $ 41 $ 3,861 The following tables detail Brookfield Infrastructure’s sensitivity to a 10% increase and decrease in the U.S. dollar against the relevant foreign currencies, with all other variables held constant as at reporting date. 10% is the sensitivity rate used when reporting foreign currency risk internally. The sensitivity analysis is performed as follows: • Outstanding foreign currency denominated monetary items (excluding foreign exchange derivative contracts) are adjusted at period end for a 10% change in foreign currency rates from the rate at which they are translated; • Foreign currency derivative contracts are measured as the change in fair value of the derivative as a result of a 10% change in the spot currency rate; and • The impact on net income results from performing a sensitivity of a 10% change in foreign exchange rates applied to the profit or loss contribution from foreign operations (after considering the impact of foreign exchange derivative contracts). Impact on Net Income 2017 2016 2015 US$ MILLIONS -10% 10% -10% 10% -10% 10% USD/AUD $ (18 ) $ 18 $ (2 ) $ 2 $ 8 $ (8 ) USD/EUR (9 ) 9 (8 ) 8 5 (5 ) USD/GBP (3 ) 3 (6 ) 6 5 (5 ) USD/BRL 21 (21 ) 14 (14 ) — — USD/CLP 1 (1 ) — — 1 (1 ) USD/CAD (1 ) 1 (1 ) 1 1 (1 ) USD/PEN — — — — — — USD/INR — — — — — — Impact on Partnership Capital 2017 2016 2015 US$ MILLIONS -10% 10% -10% 10% -10% 10% USD/AUD $ — $ — $ — $ — $ 24 $ (24 ) USD/EUR — — 35 (35 ) 18 (18 ) USD/GBP — — — — 23 (23 ) USD/CLP 8 (8 ) 10 (10 ) 13 (13 ) USD/COP 7 (7 ) 6 (6 ) 6 (6 ) USD/BRL 334 (334 ) 172 (172 ) 89 (89 ) USD/CAD — — — — 11 (11 ) USD/PEN 12 (12 ) 11 (11 ) — — USD/INR 4 (4 ) 4 (4 ) — — (c) Credit Risk Management Credit risk is the risk of loss due to the failure of a borrower or counterparty to fulfill its contractual obligations. From a treasury perspective, counterparty credit risk is managed through the establishment of authorized counterparty credit limits which are designed to ensure that Brookfield Infrastructure only deals with credit worthy counterparties and that counterparty concentration is addressed and the risk of loss is mitigated. Credit limits are sufficiently low to restrict Brookfield Infrastructure from having credit exposures concentrated with a single counterparty but rather encourages spreading such risks among several parties. The limits are set at levels that reflect Brookfield Infrastructure’s scale of activity and allow it to manage its treasury business competitively. Brookfield Infrastructure does not have any significant credit risk exposure to any single counterparty or any group of counterparties having similar characteristics. The credit risk on liquid funds and derivative financial instruments is limited because the counterparties are banks with high credit ratings assigned by international credit rating agencies. Exposure to credit risk is limited to the carrying amount of the assets on the Consolidated Statements of Financial Position.

CAPITAL MANAGEMENT

CAPITAL MANAGEMENT	12 Months Ended
	Dec. 31, 2017
Disclosure of Capital Management [Abstract]
Disclosure of objectives, policies and processes for managing capital [text block]	CAPITAL MANAGEMENT Our partnership’s approach to capital management is focused on maximizing returns to unitholders and ensuring capital is deployed in a manner consistent with achieving our investment return objectives. Invested Capital, which tracks the amount of capital that has been contributed to our partnership, is a measure we utilize to assess returns on capital deployed, relative to targeted returns. Investment decisions are based on, amongst other measures and factors, targeted returns on Invested Capital of 12% to 15% annually over the long-term. We measure return on Invested Capital as adjusted funds from operations (“AFFO”), less estimated 1 returns of capital on operations that are not perpetual in life, divided by the weighted average Invested Capital for the period. We define Invested Capital as partnership capital removing the impact of the following items: non-controlling interest - in operating subsidiaries, retained earnings or deficit, accumulated other comprehensive income and ownership changes. 1. Estimated based on the discounted cash flow models which we utilize in order to value and measure the performance of our operations. US$ MILLIONS 2017 2016 Partnership Capital $ 13,474 $ 9,644 Remove impact of the following items since inception: Non-controlling interest - in operating subsidiaries (5,875 ) (2,771 ) Deficit 1,366 697 Accumulated other comprehensive income (1,257 ) (1,074 ) Ownership changes (109 ) (109 ) Invested Capital $ 7,599 $ 6,387 The following table presents the change in Invested Capital during year ended December 31, 2017 : US$ MILLIONS 2017 2016 Opening balance $ 6,387 $ 5,452 Issuance of preferred units 220 186 Issuance of limited partnership units and redeemable partnership units 992 749 Ending balance $ 7,599 $ 6,387 Weighted Average Invested Capital $ 6,885 $ 5,592

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	12 Months Ended
	Dec. 31, 2017
Cash Flow Statement [Abstract]
SUPPLEMENTAL CASH FLOW INFORMATION	SUPPLEMENTAL CASH FLOW INFORMATION For the Year Ended US$ MILLIONS 2017 2016 2015 Interest paid $ 451 $ 366 $ 332 Income taxes paid $ 132 $ 33 $ 22 Amounts paid and received for interest were reflected as operating cash flows in the Consolidated Statements of Cash Flows. Interest paid is net of debt related hedges. Amounts paid for income taxes were reflected as either operating cash flows or investing cash flows in the Consolidated Statements of Cash Flows depending upon the nature of the underlying transaction. Details of “Changes in non-cash working capital, net” on the Consolidated Statements of Cash Flows are as follows: For the Year Ended US$ MILLIONS 2017 2016 2015 Accounts receivable $ (31 ) $ 31 $ 27 Prepayments and other 4 3 1 Accounts payable and other 158 11 (110 ) Changes in non-cash working capital, net $ 131 $ 45 $ (82 )

SIGNIFICANT ACCOUNTING POLICI42

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2017
Corporate Information And Statement Of IFRS Compliance [Abstract]
Statement of Compliance	Statement of Compliance T hese consolidated financial statements have been prepared in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board (“IFRS”). The consolidated financial statements were authorized for issue by the Board of Directors on March 13, 2018 .
Basis of Preparation	Basis of Preparation The consolidated financial statements are prepared on a going concern basis. Standards and guidelines not yet effective for the current accounting period are described in Note 3 (s), Future Changes in Accounting Policies.
Subsidiaries	Subsidiaries These consolidated financial statements include the accounts of our partnership and subsidiaries over which our partnership has control. Subsidiaries are consolidated from the date of acquisition, being the date on which our partnership obtains control, and continue to be consolidated until the date when control is lost. Our partnership (investor) controls an investee when it is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Together, our partnership and its subsidiaries are referred to as “Brookfield Infrastructure” in these financial statements. Non-controlling interests may be initially measured either at fair value or at the non-controlling interests’ proportionate share of the fair value of the acquiree’s identifiable net assets. The choice of measurement basis is made on an acquisition by acquisition basis. Subsequent to acquisition, the carrying amount of non-controlling interests is the amount of those interests at initial recognition plus the non-controlling interests’ share of subsequent changes in partnership capital in addition to changes in ownership interests. Total comprehensive income is attributed to non-controlling interests, even if this results in the non-controlling interests having a deficit balance. Holding LP has issued Redeemable Partnership Units held by Brookfield, which may, at the request of the holder, require the Holding LP to redeem the Redeemable Partnership Units for cash consideration equal to the market price of our partnership’s units. This right is subject to our partnership’s right of first refusal which entitles it, at its sole discretion, to elect to acquire any Redeemable Partnership Unit so presented to Holding LP in exchange for one of our partnership’s units subject to certain customary adjustments. All intercompany balances, transactions, revenues and expenses are eliminated in full.
Associates and Joint Ventures	Associates and Joint Ventures Associates and joint ventures are entities over which our partnership has significant influence or joint control. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not constitute control. Our partnership accounts for investments over which it has significant influence using the equity method, and are recorded as Investments in associates and joint ventures on the Consolidated Statements of Financial Position. Interests in investments accounted for using the equity method are initially recorded at cost. If the cost of the associate is lower than the proportionate share of the investment’s underlying fair value, our partnership records a gain on the difference between the cost and the underlying fair values of the identifiable net assets of the associate. If the cost of the associate is greater than our partnership’s proportionate share of the underlying fair value, goodwill and other adjustments arising from the purchase price allocation relating to the associate is included in the carrying amount of the investment. Subsequent to initial recognition, the carrying value of our partnership’s interest in an investee is adjusted for our partnership’s share of comprehensive income or loss and distributions from the investee. Profits or losses resulting from transactions with an associate are recognized in the consolidated financial statements based on the interests of unrelated investors in the associate.
Foreign Currency Translation	Foreign Currency Translation The U.S dollar is the functional and presentation currency of Brookfield Infrastructure. Each of Brookfield Infrastructure’s subsidiaries, associates and jointly controlled entities determines its own functional currency and items included in the financial statements of each subsidiary and associate are measured using that functional currency. Assets and liabilities of foreign operations having a functional currency other than the U.S. dollar are translated at the rate of exchange prevailing at the reporting date and revenues and expenses at average rates during the period. Gains or losses on translation are included as a component of other comprehensive income. On disposal of a foreign operation resulting in the loss of control, the component of other comprehensive income due to accumulated foreign currency translation relating to that foreign operation is reclassified to net income. Gains or losses on foreign currency denominated balances and transactions that are designated as hedges of net investments in these operations are reported in the same manner. On partial disposal of a foreign operation in which control is retained, the proportionate share of the component of other comprehensive income or loss relating to that foreign operation is reclassified to non-controlling interests in that foreign operation. Foreign currency denominated monetary assets and liabilities are translated using the rate of exchange prevailing at the reporting date and non-monetary assets and liabilities measured at fair value are translated at the rate of exchange prevailing at the date when the fair value was determined. Revenues and expenses are measured at average rates during the period. Gains or losses on translation of these items are included in net income. Gains and losses on transactions which hedge these items are also included in net income or loss. Foreign currency denominated non-monetary assets and liabilities, measured at historic cost, are translated at the rate of exchange at the transaction date.
Business Combinations	Business Combinations Business acquisitions in which control is acquired are accounted for using the acquisition method, other than those between and among entities under common control. The consideration of each acquisition is measured at the aggregate of the fair values at the acquisition date of assets transferred by the acquirer, liabilities incurred or assumed, and equity instruments issued by Brookfield Infrastructure in exchange for control of the acquiree. Acquisition related costs are recognized in the Consolidated Statement of Operating Results as incurred and included in other expenses. Where applicable, the consideration for the acquisition includes any asset or liability resulting from a contingent consideration arrangement, measured at its acquisition-date fair value. Subsequent changes in fair values are adjusted against the cost of the acquisition where they qualify as measurement period adjustments. All other subsequent changes in the fair value of contingent consideration classified as liabilities will be recognized in the Consolidated Statements of Operating Results, whereas changes in the fair values of contingent consideration classified within partnership capital are not subsequently re-measured. Where a business combination is achieved in stages, Brookfield Infrastructure’s previously held interests in the acquired entity are remeasured to fair value at the acquisition date, that is, the date Brookfield Infrastructure attains control and the resulting gain or loss, if any, is recognized in the Consolidated Statements of Operating Results. Amounts arising from interests in the acquiree prior to the acquisition date that have previously been recognized in other comprehensive income are reclassified to the Consolidated Statements of Operating Results, where such treatment would be appropriate if that interest were disposed of. If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, Brookfield Infrastructure reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period, or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the amounts recognized as of that date. The measurement period is the period from the date of acquisition to the date Brookfield Infrastructure obtains complete information about facts and circumstances that existed as of the acquisition date. The measurement period is subject to a maximum of one year subsequent to the acquisition date. If, after reassessment, Brookfield Infrastructure’s interest in the fair value of the acquiree’s identifiable net assets exceeds the sum of the consideration transferred, the amount of any non-controlling interests in the acquiree and the fair value of the acquirer’s previously held equity interest in the acquiree if any, the excess is recognized immediately in profit or loss as a bargain purchase gain. Contingent liabilities acquired in a business combination are initially measured at fair value at the date of acquisition. At the end of subsequent reporting periods, such contingent liabilities are measured at the higher of the amount that would be recognized in accordance with IAS 37, Provisions, Contingent Liabilities and Contingent Assets (“IAS 37”) and the amount initially recognized less cumulative amortization recognized in accordance with IAS 18, Revenue (“IAS 18”).
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand and short-term investments with original maturities of three months or less.
Accounts Receivable	Accounts Receivable Trade receivables are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less any allowance for uncollectability.
Property, Plant and Equipment	Property, Plant and Equipment Brookfield Infrastructure uses the revaluation method of accounting for all classes of property, plant and equipment. Property, plant and equipment is initially measured at cost and subsequently carried at its revalued amount, being the fair value at the date of the revaluation less any subsequent accumulated depreciation and any accumulated impairment losses. Revaluations are made on at least an annual basis, and on a sufficient basis to ensure that the carrying amount does not differ significantly from fair value. Where the carrying amount of an asset is increased as a result of a revaluation, the increase is recognized in other comprehensive income or loss and accumulated in equity within the revaluation surplus reserve, unless the increase reverses a previously recognized impairment recorded through net income, in which case that portion of the increase is recognized in net income. Where the carrying amount of an asset is decreased, the decrease is recognized in other comprehensive income to the extent of any balance existing in revaluation surplus in respect of the asset, with the remainder of the decrease recognized in net income. Revaluation gains are included in other comprehensive income, but are not subsequently recycled into profit or loss. An item of property, plant and equipment and any significant part initially recognized is derecognized upon disposal or when no future economic benefits are expected from its use or disposal. The gain or loss arising on disposal or retirement of an item of property, plant and equipment is determined as the difference between the sales proceeds and the carrying amount of the asset and is recognized in the Consolidated Statements of Operating Results. However, any balance accumulated in revaluation surplus is subsequently recorded in retained earnings when an asset is derecognized and not transferred to profit or loss. Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows: Buildings Up to 70 years Transmission stations, towers and related fixtures Up to 40 years Leasehold improvements Up to 50 years Plant and equipment Up to 40 years Network systems Up to 60 years Track Up to 40 years District energy systems Up to 50 years Gas storage assets Up to 50 years Depreciation on property, plant and equipment is calculated on a straight-line or declining-balance basis so as to depreciate the net cost of each asset over its expected useful life to its estimated residual value. Leasehold improvements are depreciated over the period of the lease or estimated useful life, whichever is the shorter, using the straight-line method. The estimated useful lives, residual values and depreciation methods are reviewed at the end of each annual reporting period, with the effect of any changes recognized on a prospective basis.
Investment Property	Investment Property Brookfield Infrastructure uses the fair value method to account for assets classified as investment property. An asset is determined to be an investment property when it is principally held to earn rental income or for capital appreciation, or both. Investment property is initially measured at cost including transaction costs. Subsequent to initial recognition, investment properties are carried at fair value. Gains or losses arising from changes in fair value are included in profit or loss. Fair values are primarily determined by valuation of the lease term and freehold reversion. An income capitalization approach is used by applying a yield to the rental income of the capitalization rate is reflective of the characteristics, location and market of each property. Fair value is estimated by management of our partnership with due consideration given to observable market inputs, where available.
Asset Impairment	Asset Impairment At each reporting date Brookfield Infrastructure assesses whether for assets, other than those measured at fair value with changes in values recorded in profit or loss, there is any indication that such assets are impaired. This assessment includes a review of internal and external factors which includes, but is not limited to, changes in the technological, political, economic or legal environment in which the entity operates in, structural changes in the industry, changes in the level of demand, physical damage and obsolescence due to technological changes. An impairment is recognized if the recoverable amount, determined as the higher of the estimated fair value less costs of disposal or the discounted future cash flows generated from use and eventual disposal from an asset or cash generating unit is less than its carrying value. The projections of future cash flows take into account the relevant operating plans and management’s best estimate of the most probable set of conditions anticipated to prevail. Where an impairment loss subsequently reverses, the carrying amount of the asset or cash generating unit is increased to the lesser of the revised estimate of recoverable amount and the carrying amount that would have been recorded had no impairment loss been recognized previously.
Intangible Assets	Intangible Assets Intangible assets acquired in a business combination and recognized separately from goodwill are initially recognized at their fair value at the acquisition date. Brookfield Infrastructure’s intangible assets are comprised primarily of conservancy rights, service concession arrangements and customer order backlogs. Subsequent to initial recognition, intangible assets acquired in a business combination are reported at cost less accumulated amortization unless indefinite-lived and accumulated impairment losses, on the same basis as intangible assets acquired separately. Public service concessions that provide Brookfield Infrastructure the right to charge users for a service in which the service and fee is regulated by the grantor are accounted for as an intangible asset under IFRIC 12, Service Concession Arrangements . Concession arrangements were acquired as part of the acquisition of the Australian regulated terminal operation, Brazilian regulated gas transmission, and Chilean, Indian and Peruvian toll roads and were initially recognized at their fair values. The intangible asset at the Australian regulated terminal operation relates to use of a specific coal port terminal for a contractual length of time and is amortized over the life of the contractual arrangement with 83 years remaining on a straight-line basis. The intangible assets at the Brazilian regulated gas transmission operation relate to pipeline concession contracts, amortized on a straight-line basis over the life of the contractual arrangement. The intangible assets at the Chilean, Indian and Peruvian toll roads relate to the right to operate a road and charge users a specified tariff for a contractual length of time and is amortized over the life of the contractual arrangement with an average of 16 , 6 , and 25 years remaining, respectively. The conservancy right was acquired as part of the acquisition of the U.K. port operation and was recorded at its fair value. As a right in perpetuity issued by the Statutory Harbour Authority in the U.K., the conservancy right is classified as having an indefinite life and is subject to an annual impairment assessment. The customer order backlog was acquired as part of the acquisition of the U.K. regulated distribution operation and was initially recorded at its fair value. The customer order backlog represents the present value of future earnings derived from the build out of contracted connections at the acquisition date of the U.K. regulated distribution operation. The customer order backlog is amortized over its estimated useful life of 15 years. Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset and are recognized in profit or loss when the asset is derecognized.
Goodwill	Goodwill Goodwill represents the excess of the price paid for the acquisition of an entity over the fair value of the net tangible and intangible assets and liabilities acquired. Goodwill is allocated to the cash generating unit or units to which it relates. Brookfield Infrastructure identifies cash generating units as identifiable groups of assets that are largely independent of the cash inflows from other assets or groups of assets. Goodwill is evaluated for impairment annually or more often if events or circumstances indicate there may be impairment. Impairment is determined for goodwill by assessing if the carrying value of a cash generating unit, including the allocated goodwill, exceeds its recoverable amount determined as the greater of the estimated fair value less costs of disposal or the value in use. Impairment losses recognized in respect of a cash generating unit are first allocated to the carrying value of goodwill and any excess is allocated to the carrying amount of assets in the cash generating unit. Any goodwill impairment is charged to profit or loss in the period in which the impairment is identified. Impairment losses on goodwill are not subsequently reversed. On disposal of a subsidiary, the attributable amount of goodwill is included in the determination of the gain or loss on disposal of the operation.
Revenue Recognition	Revenue Recognition Revenue is recognized to the extent that it is probable that the economic benefits will flow to Brookfield Infrastructure and the revenue and costs incurred or to be incurred can be reliably measured. Revenue is measured at the fair value of the consideration received or receivable. Amounts disclosed as revenue are net of estimated customer returns, trade allowances, rebates and other similar allowances. When our partnership receives a transfer of cash or property, plant and equipment from a customer, it assesses whether the constructed or acquired item of property, plant and equipment meets the definition of an asset in accordance with IFRIC 18, Transfer of Assets from Customers (“IFRIC 18”). If the definition of an asset is met, our partnership recognizes the item of property, plant and equipment at its cost and recognizes revenue or deferred revenue, as applicable, for the same amount based on the appropriate revenue recognition policy. Brookfield Infrastructure recognizes revenue when the specific criteria have also been met for each of Brookfield Infrastructure’s activities as described below. Cash received by Brookfield Infrastructure from customers is recorded as deferred revenue until revenue recognition criteria are met. Utilities Revenue from utilities infrastructure is derived from the transmission of energy and natural gas, the distribution of energy and from Brookfield Infrastructure’s Australian regulated terminal operation. Distribution and transmission revenue is recognized when services are rendered based upon usage or volume during that period. Terminal infrastructure charges are charged at set rates per tonne of coal based on each customer’s annual contracted tonnage and is then recognized on a pro-rata basis each month. Brookfield Infrastructure’s Australian regulated terminal operation also recognizes handling charges based on tonnes of coal shipped through the terminal. Brookfield Infrastructure’s regulated distribution operation receives customer contributions which are recorded in deferred revenue and released on a percentage of completion basis in accordance with IFRIC 18 and IAS 11. Transport Revenue from transport infrastructure consists primarily of freight, toll road operations and transportation services revenue. Revenue is recognized when services are provided and rendered based primarily on usage or volume throughput during the period. Energy Revenue from energy infrastructure consists primarily of energy transmission and storage as well as district energy services. Revenue is recognized when services are provided and rendered based primarily on usage or volume throughput during the period. Communications Infrastructure Revenue from communications infrastructure is derived from contracts with media broadcasting and telecom customers to access infrastructure. Customers pay upfront and recurring fees to lease space on towers to host their equipment. Recurring rental revenue is recognized on a straight line basis based on lease agreements. Upfront payments which are separable from the recurring revenue under IFRIC 18 are recognized on a percentage of completion basis on the construction asset they relate to.
Financial Instruments and Hedge Accounting	Financial Instruments and Hedge Accounting The following summarizes Brookfield Infrastructure’s classification and measurement of financial assets and liabilities: Classification Measurement Financial assets Cash and cash equivalents Loans and receivables Amortized cost Accounts receivable and other Loans and receivables Amortized cost Restricted cash and deposits Loans and receivables Amortized cost Marketable securities Available-for-sale Fair value Financial assets Derivative assets FVTPL (1) Fair value Other financial assets Loans and receivables/ Available-for-sale Amortized cost/ Fair value Financial liabilities Corporate borrowings Other liabilities Amortized cost Non-recourse borrowings Other liabilities Amortized cost (2) Accounts payable and other Other liabilities Amortized cost Preferred shares Other liabilities Amortized cost Financial liabilities FVTPL (1) Fair value (1) Fair value through profit or loss (“FVTPL”), except for derivatives in certain hedge relationships. (2) Except for derivatives embedded in the related financial instruments that are classified as FVTPL and measured at fair value. Our partnership maintains a portfolio of marketable securities comprised of liquid equity and debt securities. The marketable securities are classified as available-for-sale and are subsequently measured at fair value at each reporting date with the change in fair value recorded in other comprehensive income. When a decline in the fair value of an available-for-sale financial asset has been recognized in other comprehensive income and there is objective evidence that the asset is impaired, the cumulative loss that had been recognized in other comprehensive income is reclassified from equity to profit or loss as a reclassification adjustment. Brookfield Infrastructure selectively utilizes derivative financial instruments primarily to manage financial risks, including interest rate and foreign exchange risks. Derivative financial instruments are recorded at fair value. Hedge accounting is applied when the derivative is designated as a hedge of a specific exposure and there is assurance that it will continue to be highly effective as a hedge based on an expectation of offsetting cash flows or fair value. Hedge accounting is discontinued prospectively when the derivative no longer qualifies as a hedge or the hedging relationship is terminated. Once discontinued, the cumulative change in fair value of a derivative that was previously recorded in other comprehensive income by the application of hedge accounting is recognized in profit or loss over the remaining term of the original hedging relationship as amounts related to the hedged item are recognized in profit or loss. The assets or liabilities relating to unrealized mark-to-market gains and losses on derivative financial instruments are recorded in Financial Assets and Financial Liabilities, respectively. (i) Items Classified as Hedges Realized and unrealized gains and losses on foreign exchange contracts, designated as hedges of currency risks relating to a net investment in a subsidiary with a functional currency other than the U.S. dollar are included in equity and are included in net income in the period in which the subsidiary is disposed of or to the extent partially disposed and control is not retained. Derivative financial instruments that are designated as hedges to offset corresponding changes in the fair value of assets and liabilities and cash flows are measured at estimated fair value with changes in fair value recorded in profit or loss or as a component of equity as applicable. Unrealized gains and losses on interest rate contracts designated as hedges of future variable interest payments are included in equity as a cash flow hedge when the interest rate risk relates to an anticipated variable interest payment. The periodic exchanges of payments on interest rate swap contracts designated as hedges of debt are recorded on an accrual basis as an adjustment to interest expense. The periodic exchanges of payments on interest rate contracts designated as hedges of future interest payments are amortized into profit or loss over the term of the corresponding interest payments. (ii) Items Not Classified as Hedges Derivative financial instruments that are not designated as hedges are carried at estimated fair value, and realized and unrealized gains and losses are recognized in net income in the period the gains and losses occur. Other financial assets are classified as loans and receivables or available-for-sale securities based on their nature and use within our partnership’s business and are recorded initially at fair value. Other financial assets classified as available-for-sale are subsequently measured at fair value at each reporting date with the change in fair value recorded in other comprehensive income. Other financial assets classified as loans and receivables are subsequently measured at amortized cost using the effective interest method, less any impairment. Assets classified as loans and receivables are impaired when there exists objective evidence that the financial asset is impaired.
Income Taxes	Income Taxes Income tax expense represents the sum of the tax accrued in the period and deferred income tax. (i) Current income tax Current income tax assets and liabilities are measured at the amount expected to be paid to tax authorities, net of recoveries based on the tax rates and laws enacted or substantively enacted at the reporting date. Current income tax relating to items recognized directly in partnership capital are also recognized directly in partnership capital and other comprehensive income. (ii) Deferred income tax Deferred income tax liabilities are provided for using the liability method on temporary differences between the tax bases used in the computation of taxable income and carrying amounts of assets and liabilities in the consolidated financial statements. Deferred income tax assets are recognized for all deductible temporary differences, carry forward of unused tax credits and unused tax losses, to the extent that it is probable that deductions, tax credits and tax losses can be utilized. Such deferred income tax assets and liabilities are not recognized if the temporary difference arises from goodwill or from the initial recognition of other assets and liabilities in a transaction that affects neither the taxable income nor the accounting income, other than in a business combination. The carrying amount of deferred income tax assets are reviewed at each reporting date and reduced to the extent it is no longer probable that the income tax asset will be recovered. Deferred income tax liabilities are recognized for taxable temporary differences associated with investments in subsidiaries and associates, and interests in joint ventures, except where Brookfield Infrastructure is able to control the reversal of the temporary difference and it is probable that the temporary differences will not reverse in the foreseeable future. Deferred income tax assets arising from deductible temporary differences associated with such investments and interests are only recognized to the extent that it is probable that there will be sufficient taxable income against which to utilize the benefits of the temporary differences and they are expected to reverse in the foreseeable future. Deferred income tax assets and liabilities are measured at the tax rates that are expected to apply in the period in which the liability is settled or the asset realized, based on tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred income tax liabilities and assets reflect the tax consequences that would follow from the manner in which Brookfield Infrastructure expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred income tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax liabilities and when they relate to income taxes levied by the same taxation authority within a single taxable entity or Brookfield Infrastructure intends to settle its current tax assets and liabilities on a net basis in the case where there exist different taxable entities in the same taxation authority and when there is a legally enforceable right to set off current tax assets against current tax liabilities.
Assets Held for Sale	Assets Held for Sale Non-current assets and disposal groups are classified as held for sale if their carrying amount will be recovered principally through a sale transaction rather than through continuing use. This condition is regarded as met only when the sale is highly probable and the non-current asset or disposal group is available for immediate sale in its present condition. Management must be committed to the sale, which should be expected to qualify for recognition as a completed sale within one year from the date of classification subject to limited exceptions. When Brookfield Infrastructure is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether Brookfield Infrastructure will retain a non-controlling interest in its former subsidiary after the sale. Non-current assets and disposal groups classified as held for sale are measured at the lower of their previous carrying amount and fair value less costs to sell. Non-current assets classified as held for sale and the assets of a disposal group are presented separately from other assets in the Consolidated Statements of Financial Position and are classified as current. The liabilities of a disposal group classified as held for sale are presented separately from other liabilities in the Consolidated Statements of Financial Position. Once classified as held for sale, property, plant and equipment and intangible assets are not depreciated or amortized, respectively.
Provisions	Provisions Provisions are recognized when Brookfield Infrastructure has a present obligation, either legal or constructive, as a result of a past event, it is probable that Brookfield Infrastructure 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. Where a provision is measured using the cash flows estimated to settle the obligation, its carrying amount is the present value of those cash flows. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, the receivable is recognized as an asset if it is virtually certain that reimbursement will be received and the amount of the receivable can be measured reliably.
Critical Accounting Judgments and Key Sources of Estimation Uncertainty	Critical Accounting Judgments and Key Sources of Estimation Uncertainty The preparation of financial statements requires management to make critical judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses that are not readily apparent from other sources, during the reporting period. These estimates and associated assumptions are based on historical experience and other factors that are considered to be relevant. Actual results may differ from these estimates. The estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimate is revised if the revision affects only that period, or in the period of the revision and future periods if the revision affects both current and future periods. Critical judgments made by management and utilized in the normal course of preparing Brookfield Infrastructure’s consolidated financial statements are outlined below. (i) Common control transactions IFRS 3 (2008) Business Combinations does not include specific measurement guidance for transfers of businesses or subsidiaries between entities under common control. Accordingly, Brookfield Infrastructure has developed a policy to account for such transactions taking into consideration other guidance in the IFRS framework and pronouncements of other standard-setting bodies. Brookfield Infrastructure’s policy is to record assets and liabilities recognized as a result of transactions between entities under common control at the carrying value on the transferor’s financial statements, and to have the Consolidated Statements of Financial Position, Consolidated Statements of Operating Results, Consolidated Statements of Comprehensive Income and Statements of Cash Flows reflect the results of combining entities for all periods presented for which the entities were under the transferor’s common control, irrespective of when the combination takes place. (ii) Financial instruments Brookfield Infrastructure’s accounting policies relating to derivative financial instruments are described in Note 3 (m), Financial Instruments and Hedge Accounting. The critical judgments inherent in these policies relate to applying the criteria to the assessment of the effectiveness of hedging relationships. Estimates and assumptions used in determining the fair value of financial instruments are equity and commodity prices; future interest rates; the credit worthiness of the company relative to its counterparties; the credit risk of our partnership and counterparty; estimated future cash flows; and discount rates. (iii) Revaluation of property, plant and equipment Property, plant and equipment is revalued on a regular basis. The critical estimates and assumptions underlying the valuation of property, plant and equipment are set out in Note 12 , Property, Plant and Equipment. (iv) Fair values in business combinations Brookfield Infrastructure accounts for business combinations using the acquisition method of accounting. This method requires the application of fair values for both the consideration given and the assets and liabilities acquired. The calculation of fair values is often predicated on estimates and judgments including future cash flows discounted at an appropriate rate to reflect the risk inherent in the acquired assets and liabilities (refer to Note 5 , Acquisition of Business for details of business combinations). The determination of the fair values may remain provisional for up to 12 months from the date of acquisition due to the time required to obtain independent valuations of individual assets and to complete assessments of provisions. When the accounting for a business combination has not been completed as at the reporting date, this is disclosed in the financial statements, including observations on the estimates and judgments made as of the reporting date. (v) Assets held for sale Brookfield Infrastructure applies judgment to determine whether an asset or disposal group is available for immediate sale in its present condition and that its sale is highly probable and therefore should be classified as held for sale at the balance sheet date. Conditions that support a highly probable sale include the following: an appropriate level of management is committed to a plan to sell the asset or disposal group, an active programme to locate a buyer is initiated, the asset is being actively marketed for sale at a price reasonable in relation to its fair value, the sale is highly probably within 12 months of classification as held for sale, and actions required to complete the plan indicate that it is unlikely that plan will be significantly changed or withdrawn. (vi) Impairment of goodwill, intangibles with indefinite lives and investment in associates and joint ventures The impairment assessment of goodwill and intangible assets with indefinite lives requires estimation of the value-in-use or fair value less costs of disposal of the cash-generating units to which goodwill or the intangible asset has been allocated. Brookfield Infrastructure uses the following critical assumptions and estimates: the circumstances that gave rise to the goodwill, timing and amount of future cash flows expected from the cash-generating unit; discount rates; terminal capitalization rates; terminal valuation dates and useful lives. The impairment assessment of investments in associates and joint ventures requires estimation of the recoverable amount of the asset. Other estimates utilized in the preparation of our partnership’s financial statements are: depreciation and amortization rates and useful lives; recoverable amount of goodwill and intangible assets; ability to utilize tax losses and other tax measurements. Other critical judgments utilized in the preparation of our partnership’s financial statements include the methodologies for calculating amortization, determination of operating segments and determination of control.
Recently adopted accounting standard amendments	Recently adopted accounting standard amendments Brookfield Infrastructure applied, for the first time, certain amendments to Standards applicable to Brookfield Infrastructure that became effective January 1, 2017. The impact of adopting these amendments on our partnership’s accounting policies and disclosures are as follows: IAS 7 Statement of Cash Flows (“IAS 7”) In January 2016, the IASB issued amendments to IAS 7, effective for annual periods beginning on or after January 1, 2017. The amendment requires that the following changes in liabilities arising from financing activities are disclosed (to the extent necessary): (i) changes from financing cash flows; (ii) changes arising from obtaining or losing control of subsidiaries or other businesses; (iii) the effect of changes in foreign exchange rates; (iv) changes in fair values; and (v) other changes. Amendments to IAS 7 were applied prospectively and resulted in no material impact to Brookfield Infrastructure’s consolidated financial statements.
Future Changes in Accounting Policies	Future Changes in Accounting Policies Standards issued, but not yet adopted IFRS 15 Revenue from Contracts with Customers—(“IFRS 15”) IFRS 15, Revenue from Contracts with Customers specifies how and when revenue should be recognized as well as requiring more informative and relevant disclosures. This standard also requires additional disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. IFRS 15 supersedes IAS 18, Revenue , IAS 11, Construction Contracts and a number of revenue-related interpretations. IFRS 15 applies to nearly all contracts with customers: the main exceptions are leases, financial instruments and insurance contracts. IFRS 15 must be applied for periods beginning on or after January 1, 2018. An entity may adopt the standard on a fully retrospective basis or on a modified retrospective basis. Our partnership has a global team in place to evaluate the financial statement and any corollary impact of adopting IFRS 15, has participated in strategic planning sessions with Brookfield and has developed an adoption plan. Management has also assessed major revenue streams, and has substantially completed accumulating, identifying and inventorying detailed information on major contracts that may be impacted by the changes at the transition date. The key areas of focus within the context of the standard are primarily in relation to the identification of performance obligation and the evaluation of the appropriate period of recognition of revenue for each of these performance obligations. Our partnership has finalized the documented analysis and assessed potential impact to IT systems and internal controls. We will adopt the new revenue guidance effective January 1, 2018, using the modified retrospective approach, by recognizing the cumulative effect of initially applying the new standard as an adjustment to opening retained earnings as if the standard had always been in effect and whereby comparative periods will not be restated. No material adjustments required upon adoption have been noted to date, however further technical analysis and quantitative assessments are required to conclude on the overall impact. IFRS 9 Financial Instruments—(“IFRS 9”) In July 2014, the IASB issued the final publication of IFRS 9, superseding IAS 39, Financial Instruments. This standard establishes principles for the financial reporting of financial assets and financial liabilities that will present relevant and useful information to users of financial statements for their assessment of the amounts, timing and uncertainty of an entity’s future cash flows. This new standard also includes a new general hedge accounting standard which will align hedge accounting more closely with an entity’s risk management activities. It does not fully change the types of hedging relationships or the requirement to measure and recognize ineffectiveness, however, it will allow more hedging strategies that are used for risk management to qualify for hedge accounting and introduce more judgment to assess the effectiveness of a hedging relationship. The standard has a mandatory effective date for annual periods beginning on or after January 1, 2018. Our partnership has a global team in place to evaluate the financial statements and any corollary impact of IFRS 9 on its consolidated financial statements and business processes. To date, management has participated in a number of strategic planning and analysis sessions with its subsidiaries and associates in order to evaluate the impact of IFRS 9 with a primary focus on the appropriateness of financial asset classification and the consideration of the financial asset impairment requirements under this standard. The evaluation of changes resulting from IFRS 9 relating to hedge accounting have been substantially completed and it has been determined that certain hedge accounting relationships relating to aggregated foreign currency exposures will qualify for hedge accounting under this new standard. Consequently, the partnership has completed the hedge documentation for these relationships in order to apply hedge accounting to these relationships prospectively commencing on January 1, 2018. In addition, our partnership has elected certain gas storage contracts to be measured at fair value through profit or loss. Next steps involve the finalization of documented analyses and drafting pro-forma disclosures that will be required upon initial adoption of this standard and thereafter. We are progressing as planned toward the implementation of IFRS 9. Our partnership has decided to adopt IFRS 9 retrospectively with no restatement of comparatives. A cumulative catch-up adjustment will be recorded through equity upon initial adoption. No material adjustments required upon adoption have been noted to date, however further technical analysis and quantitative assessments are required to conclude on the overall impact. IFRS 16 Leases—(“IFRS 16”) The IASB has published a new standard, IFRS 16. The new standard brings most leases on-balance sheet for lessees under a single model, eliminating the distinction between operating and finance leases. Lessor accounting however remains largely unchanged and the distinction between operating and finance leases is retained. IFRS 16 supersedes IAS 17, Leases and related interpretations and is effective for periods beginning on or after January 1, 2019, with earlier adoption permitted if IFRS 15 has also been applied. Brookfield Infrastructure is currently evaluating the impact of IFRS 16 on its consolidated financial statements. Amendments and Interpretations, not yet adopted IFRIC 22 Foreign Currency Transactions and Advance Considerations—(“IFRIC 22”) In December 2016, the IASB issued IFRIC 22, effective for annual periods beginning on or after January 1, 2018. The interpretation clarifies that the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income (or part of it) 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 may be applied either retrospectively or prospectively. Adoption will occur on a prospective basis and it is not anticipated that the impact will be material. IFRIC 23 Uncertainty over Income Tax Treatments—(“IFRIC 23”) In June 2017, the IASB published IFRIC 23, effective for annual periods beginning on or after January 1, 2019. The interpretation requires an entity to assess whether it is probable that a tax authority will accept an uncertain tax treatment used, or proposed to be used, by an entity in its income tax filings and to exercise judgment in determining whether each tax treatment should be considered independently or whether some tax treatments should be considered together. The decision should be based on which approach provides better predictions of the resolution of the uncertainty. An entity also has to consider whether it is probable that the relevant authority will accept each tax treatment, or group of tax treatments, assuming that the taxation authority with the right to examine any amounts reported to it will examine those amounts and will have full knowledge of all relevant information when doing so. The interpretation may be applied on either a fully retrospective basis or a modified retrospective basis without restatement of comparative information. Brookfield Infrastructure is currently evaluating the impact of IFRIC 23 on its consolidated financial statements.

SUBSIDIARIES (Tables)

SUBSIDIARIES (Tables)	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
Disclosure of interests in subsidiaries	The following provides information about our partnership’s wholly-owned subsidiaries as of December 31, 2017 and 2016 : Ownership interest (%) Country of incorporation Defined Name Name of entity 2017 2016 Transport Australian rail operation Arc Infrastructure Holdings No. 1 Pty Ltd Australia 100 100 Energy Australian energy distribution operation Tas Gas Networks Pty Ltd Australia 100 100 The following table presents details of non-wholly owned subsidiaries of our partnership: Ownership Interest (%) Voting interest (%) Country of incorporation Defined Name Name of entity 2017 2016 2017 2016 Utilities U.K. regulated distribution operation BUUK Infrastructure Holdings Limited U.K. 80 80 80 80 Australian regulated terminal operation DBCT Management Pty Ltd (1) Australia 71 71 100 100 Colombian regulated distribution operation Empresa de Energia de Boyaca S.A. (1) Colombia 17 17 100 100 Brazilian regulated gas transmission operation Nova Transportadora do Sudeste (1),(2) Brazil 28 — 90 — Transport U.K. ports operation Brookfield Port Acquisitions (UK) Limited (1) U.K. 59 59 100 100 Australian ports operation Linx Cargo Care Group Pty Ltd (1),(3) Australia 27 27 67 67 Chilean toll roads Sociedad Concesionaria Vespucio Norte Express S.A. (1) Chile 51 51 89 89 Indian toll roads BIF India Holdings Pte Ltd (1),(4) Singapore 40 40 93 93 Peruvian toll roads Rutas de Lima S.A.C (1),(5) Peru 17 17 57 57 Energy North American gas storage operation (6) Warwick Gas Storage L.P. (1) Canada 25 25 100 100 Canadian district energy operation Enwave Energy Corporation (1) Canada 25 25 100 100 U.S. district energy operation Enwave USA (1) U.S. 40 40 100 100 North American gas storage operation (6) Lodi Gas Storage (1) U.S. 40 40 100 100 North American gas storage operation (6) Rockpoint Gas Storage Partners (1),(7) U.S. 40 40 100 100 Corporate & Other Holding LP Brookfield Infrastructure L.P. Bermuda 70 70 100 100 (1) For the above noted subsidiaries, our partnership has entered into voting arrangements to provide our partnership with the ability to direct the relevant activities of the investee. Our partnership controls these investees given that our partnership is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Our partnership exercises judgment to determine the level of variability that will achieve control over an investee, particularly in circumstances where our partnership’s voting interest differs from its ownership interest in an investee. The following were considered to determine whether our partnership controls these investees: the degree of power (if any) held by other investors, the degree of exposure to variability of each investor, the determination of whether any general partner removal rights are substantive and the purpose and design of the investee. (2) In April 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund (the “consortium”), acquired an effective 28% interest in Nova Transportadora do Sudeste S.A. (“NTS”), a Brazilian regulated gas transmission business, for total consideration of $1.6 billion . (3) In August 2016, Brookfield Infrastructure expanded its ports business to Australia as it acquired a 27% interest in Linx Cargo Care Group Pty Ltd through a Brookfield-sponsored infrastructure fund, along with institutional partners (the “Brookfield Consortium”) for total consideration of $145 million . (4) In March 2016 , Brookfield Infrastructure acquired a 40% interest in a toll road business in India from Gammon Infrastructure Projects Limited for consideration of $42 million through a Brookfield-sponsored infrastructure fund. (5) In June 2016 , Brookfield Infrastructure acquired a 17% interest in Rutas de Lima S.A.C. for total consideration of $127 million through a Brookfield-sponsored infrastructure fund. (6) North American gas storage operations include Warwick Gas Storage L.P., Lodi Gas Storage and Rockpoint Gas Storage Partners L.P. (7) In July 2016, Brookfield Infrastructure acquired a 40% interest in Rockpoint Gas Storage Partners L.P. for consideration of $227 million through a Brookfield-sponsored infrastructure fund. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Financial Position: As of December 31, 2017 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 107 $ 3,550 $ 281 $ 2,261 $ 217 $ 898 Australian regulated terminal 38 2,229 34 2,035 62 136 Colombian regulated distribution 68 764 26 438 302 66 Brazilian regulated gas transmission operation 322 5,990 73 2,015 3,081 1,143 Transport U.K. port operation 44 880 133 353 179 259 Australian port operation 163 628 101 218 346 126 Chilean toll roads 84 1,116 59 989 75 77 Peruvian toll roads 101 1,356 18 674 644 121 Indian toll roads 58 256 30 185 60 39 Energy North American gas storage operation 206 1,259 244 409 502 310 Canadian district energy operation 75 699 55 394 243 82 U.S. district energy operation 37 799 19 668 78 71 Corporate & Other Holding LP and other 127 244 392 2,060 84 (2,165 ) Total $ 1,430 $ 19,770 $ 1,465 $ 12,699 $ 5,873 $ 1,163 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. As of December 31, 2016 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 65 $ 2,985 $ 154 $ 1,919 $ 183 $ 794 Australian regulated terminal 27 2,162 (9 ) 1,926 70 202 Colombian regulated distribution 55 701 27 369 294 66 Transport U.K. port operation 42 754 108 324 150 214 Australian port operation 142 587 94 205 315 115 Chilean toll roads 102 1,069 50 941 89 91 Brazilian toll roads 42 466 27 — 189 292 Peruvian toll roads 127 1,261 27 635 610 116 Indian toll roads 52 264 36 186 58 36 Energy North American gas storage 199 1,141 136 478 452 274 Canadian district energy operation 15 570 13 290 209 73 U.S. district energy operation 43 697 62 537 73 68 Corporate & Other Holding LP and other 631 377 677 810 79 (558 ) Total $ 1,542 $ 13,034 $ 1,402 $ 8,620 $ 2,771 $ 1,783 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Operating Results: Year ended December 31, 2017 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 385 $ 21 $ 29 $ 114 $ 118 Australian regulated terminal operation 301 15 3 35 7 Colombian regulated distribution operation 161 12 38 2 7 Brazilian regulated gas transmission operation 938 349 (160 ) 146 (72 ) Transport U.K. port operation 180 8 21 22 29 Australian port operation 501 (7 ) 28 (3 ) 9 Chilean toll roads 154 — 7 — 8 Peruvian toll roads 103 12 22 2 5 Indian toll roads 57 (2 ) 4 (1 ) 3 Energy North American gas storage operation 149 30 74 18 47 Canadian district energy operation 95 (2 ) 39 — 13 U.S. district energy operation 131 10 40 7 26 Corporate & Other Holding LP and other 22 (3 ) 1 (349 ) (410 ) Total $ 3,177 $ 443 $ 146 $ (7 ) $ (210 ) Year ended December 31, 2016 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 347 $ 12 $ (14 ) $ 79 $ (55 ) Australian regulated terminal operation 299 15 (5 ) 46 (12 ) Colombian regulated distribution operation 150 10 45 2 10 Transport U.K. port operation 178 11 (37 ) 20 (52 ) Australian port operation 182 (18 ) (24 ) (7 ) (8 ) Chilean toll roads 127 (9 ) 7 (10 ) 8 Brazilian toll roads — 6 38 5 25 Peruvian toll roads 97 (8 ) (7 ) (2 ) (1 ) Indian toll roads 39 (3 ) 1 (3 ) — Energy North American gas storage operation 100 1 — 1 — Canadian district energy operation 79 (1 ) 31 1 11 U.S. district energy operation 111 (6 ) 31 — 20 Corporate & Other Holding LP and other 15 31 1 31 180 Total $ 1,724 $ 41 $ 67 $ 163 $ 126 Year ended December 31, 2015 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 339 $ 21 $ 25 $ 122 $ 101 Australian regulated terminal operation 330 15 (4 ) 68 (9 ) Colombian regulated distribution operation 152 13 (26 ) 16 (9 ) Transport U.K. port operation 220 7 13 22 18 Chilean toll roads 113 (7 ) (20 ) (15 ) (21 ) Energy North American gas storage operation 20 (8 ) 5 (12 ) 1 Canadian district energy operation 80 — 6 — 2 U.S. district energy operation 114 (6 ) 8 (3 ) 5 Corporate & Other Holding LP and other 21 55 (90 ) 5 (32 ) Total $ 1,389 $ 90 $ (83 ) $ 203 $ 56 The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Cash Flows: Cash Flow Activities Year ended December 31, 2017 Year ended December 31, 2016 US$ MILLIONS Operating Investing Financing Operating Investing Financing Utilities U.K. regulated distribution operation $ 220 $ (343 ) $ 129 $ 244 $ (487 ) $ 245 Australian regulated terminal operation 96 (9 ) (87 ) 128 (22 ) (106 ) Colombian regulated distribution operation 7 (22 ) 26 17 (18 ) — Brazilian regulated gas transmission operation 819 83 (839 ) — — — Transport U.K. port operation 46 (40 ) (10 ) 33 (24 ) (14 ) Australian port operation 37 (39 ) 12 7 (99 ) 154 Chilean toll roads 56 (5 ) (88 ) 63 (1 ) (99 ) Brazilian toll roads — — — 2 (70 ) 70 Peruvian toll roads 46 (67 ) — 29 25 1 Indian toll roads 30 (7 ) (22 ) (7 ) 28 (10 ) Energy North American gas storage operation 55 (9 ) (76 ) (12 ) 6 46 Canadian district energy operation 26 (82 ) 102 27 (18 ) (13 ) U.S. district energy operation 24 8 (28 ) 26 (33 ) 9 Corporate & Other Holding LP and other (98 ) (5,089 ) 4,721 124 (282 ) 618 Total $ 1,364 $ (5,621 ) $ 3,840 $ 681 $ (995 ) $ 901 Cash Flow Activities Year ended December 31, 2015 US$ MILLIONS Operating Investing Financing Utilities U.K. regulated distribution operation $ 164 $ (242 ) $ 92 Australian regulated terminal operation 103 (37 ) (67 ) New England electricity transmission operation 2 — (2 ) Colombian regulated distribution operation 16 (6 ) (7 ) Transport U.K. port operation 19 (66 ) 61 Australian port operation — — — Chilean toll roads 70 — (38 ) Energy North American gas storage operation (3 ) (1 ) 1 Canadian district energy operation 22 (16 ) (23 ) U.S. district energy operation 21 (13 ) (7 ) Corporate & Other Holding LP and other 92 (650 ) 554 Total $ 506 $ (1,031 ) $ 564

SIGNIFICANT ACCOUNTING POLICI44

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2017
Corporate Information And Statement Of IFRS Compliance [Abstract]
Disclosure of estimated useful lives of property, plant and equipment	Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows: Buildings Up to 70 years Transmission stations, towers and related fixtures Up to 40 years Leasehold improvements Up to 50 years Plant and equipment Up to 40 years Network systems Up to 60 years Track Up to 40 years District energy systems Up to 50 years Gas storage assets Up to 50 years The following table summarizes the carrying amount of property, plant and equipment that would have been recognized had assets been carried under the cost model. US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Utilities $ 2,961 $ 2,512 Transport 1,970 1,845 Energy 2,246 2,122 The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s property, plant and equipment assets, categorized by segment. Dec. 31, 2017 Dec. 31, 2016 Segment Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Utilities Discounted cash flow model 7% to 12% 7x to 21x 10 to 20 yrs Discounted cash flow model 7% to 12% 7x to 18x 10 to 20 yrs Transport Discounted cash flow model 10% to 15% 9x to 14x 10 to 20 yrs Discounted cash flow model 10% to 17% 8x to 14x 10 to 20 yrs Energy Discounted cash flow model 12% to 15% 8x to 13x 10 yrs Discounted cash flow model 9% to 14% 10x to 12x 10 yrs US$ MILLIONS Utility Assets Transport Assets Energy Assets Total Assets Gross Carrying Amount: Balance at January 1, 2016 $ 2,945 $ 2,150 $ 1,457 $ 6,552 Additions, net of disposals 399 76 89 564 Non-cash (disposals) additions (31 ) 3 — (28 ) Acquisitions through business combinations (1) — 242 825 1,067 Net foreign currency exchange differences (418 ) (109 ) 9 (518 ) Balance at December 31, 2016 $ 2,895 $ 2,362 $ 2,380 $ 7,637 Additions, net of disposals 349 104 95 548 Non-cash disposals — — (14 ) (14 ) Acquisitions through business combinations (1) — — 100 100 Net foreign currency exchange differences 227 191 68 486 Balance at December 31, 2017 $ 3,471 $ 2,657 $ 2,629 $ 8,757 Accumulated depreciation: Balance at January 1, 2016 $ (291 ) $ (418 ) $ (159 ) $ (868 ) Depreciation expense (128 ) (127 ) (99 ) (354 ) Non-cash disposals — 4 — 4 Net foreign currency exchange differences 36 24 — 60 Balance at December 31, 2016 $ (383 ) $ (517 ) $ (258 ) $ (1,158 ) Depreciation expense (118 ) (147 ) (117 ) (382 ) Disposals 19 21 — 40 Non-cash disposals — — 5 5 Net foreign currency exchange differences (28 ) (44 ) (13 ) (85 ) Balance at December 31, 2017 $ (510 ) $ (687 ) $ (383 ) $ (1,580 ) Accumulated fair value adjustments: Balance at January 1, 2016 $ 945 $ 777 $ 226 $ 1,948 Fair value adjustments 185 25 125 335 Net foreign currency exchange differences (87 ) (20 ) 1 (106 ) Balance at December 31, 2016 $ 1,043 $ 782 $ 352 $ 2,177 Fair value adjustments 137 24 257 418 Net foreign currency exchange differences 78 67 20 165 Balance at December 31, 2017 $ 1,258 $ 873 $ 629 $ 2,760 Net book value: December 31, 2017 $ 4,219 $ 2,843 $ 2,875 $ 9,937 December 31, 2016 $ 3,555 $ 2,627 $ 2,474 $ 8,656 (1) See Note 5 , Acquisition of Business for additional information.
Disclosure of classification and measurement of financial assets and liabilities	The following summarizes Brookfield Infrastructure’s classification and measurement of financial assets and liabilities: Classification Measurement Financial assets Cash and cash equivalents Loans and receivables Amortized cost Accounts receivable and other Loans and receivables Amortized cost Restricted cash and deposits Loans and receivables Amortized cost Marketable securities Available-for-sale Fair value Financial assets Derivative assets FVTPL (1) Fair value Other financial assets Loans and receivables/ Available-for-sale Amortized cost/ Fair value Financial liabilities Corporate borrowings Other liabilities Amortized cost Non-recourse borrowings Other liabilities Amortized cost (2) Accounts payable and other Other liabilities Amortized cost Preferred shares Other liabilities Amortized cost Financial liabilities FVTPL (1) Fair value (1) Fair value through profit or loss (“FVTPL”), except for derivatives in certain hedge relationships. (2) Except for derivatives embedded in the related financial instruments that are classified as FVTPL and measured at fair value.

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Operating Segments [Abstract]
Summary of financial information by segment	The following is an analysis of Brookfield Infrastructure’s assets by reportable operating segment for the years under review: Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 6,542 $ 6,990 $ 3,134 $ 1,049 $ (1,083 ) $ 16,632 $ (3,134 ) $ 11,668 $ 4,311 $ 29,477 Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 4,605 $ 6,160 $ 3,032 $ 933 $ (510 ) $ 14,220 $ (2,996 ) $ 6,496 $ 3,555 $ 21,275 (1) The above table provides each segment’s assets in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations using consolidation and the equity method whereby our partnership either controls or exercises significant influence over the investment respectively. The above table reconciles Brookfield Infrastructure’s proportionate assets to total assets presented on our partnership’s Consolidated Statements of Financial Position by removing net liabilities contained within investments in associates and joint ventures and reflecting the assets attributable to non-controlling interests, and adjusting for working capital assets which are netted against working capital liabilities. FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 988 $ 1,589 $ 559 $ 165 $ — $ 3,301 $ (1,624 ) $ 1,858 $ 3,535 Costs attributed to revenues (250 ) (895 ) (278 ) (75 ) — (1,498 ) 861 (872 ) (1,509 ) General and administrative costs — — — — (239 ) (239 ) — — (239 ) Adjusted EBITDA 738 694 281 90 (239 ) 1,564 (763 ) 986 Other (expense) income (14 ) (4 ) 15 (2 ) 45 40 7 (108 ) (61 ) Interest expense (114 ) (158 ) (87 ) (12 ) (63 ) (434 ) 172 (166 ) (428 ) FFO 610 532 209 76 (257 ) 1,170 (584 ) 712 Depreciation and amortization (186 ) (312 ) (151 ) (77 ) — (726 ) 382 (327 ) (671 ) Deferred taxes (52 ) (1 ) 11 21 14 (7 ) (22 ) (38 ) (67 ) Mark-to-market on hedging items and other (59 ) (80 ) (37 ) (9 ) (127 ) (312 ) 106 124 (82 ) Share of earnings from associates — — — — — — 118 — 118 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (471 ) (471 ) Net income (loss) attributable to partnership (2) $ 313 $ 139 $ 32 $ 11 $ (370 ) $ 125 $ — $ — $ 125 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 684 $ 1,247 $ 496 $ 163 $ — $ 2,590 $ (1,311 ) $ 836 $ 2,115 Costs attributed to revenues (160 ) (650 ) (220 ) (72 ) — (1,102 ) 651 (612 ) (1,063 ) General and administrative costs — — — — (166 ) (166 ) — — (166 ) Adjusted EBITDA 524 597 276 91 (166 ) 1,322 (660 ) 224 Other income (expense) 5 (17 ) 8 (2 ) 84 78 16 1 95 Interest expense (130 ) (157 ) (109 ) (12 ) (48 ) (456 ) 190 (126 ) (392 ) FFO 399 423 175 77 (130 ) 944 (454 ) 99 Depreciation and amortization (154 ) (253 ) (128 ) (74 ) — (609 ) 328 (166 ) (447 ) Deferred taxes 5 26 (38 ) 29 (17 ) 5 9 4 18 Mark-to-market on hedging items and other (88 ) 10 81 (5 ) 149 147 (131 ) 117 133 Share of earnings from associates — — — — — — 248 — 248 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (54 ) (54 ) Net income (loss) attributable to partnership (2) $ 162 $ 206 $ 90 $ 27 $ 2 $ 487 $ — $ — $ 487 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues 698 1,143 349 123 — 2,313 (1,044 ) 586 1,855 Costs attributed to revenues (174 ) (588 ) (183 ) (57 ) — (1,002 ) 546 (342 ) (798 ) General and administrative costs — — — — (134 ) (134 ) — — (134 ) Adjusted EBITDA 524 555 166 66 (134 ) 1,177 (498 ) 244 Other income (expense) 5 (15 ) 3 — 34 27 13 (4 ) 36 Interest expense (142 ) (142 ) (79 ) (6 ) (27 ) (396 ) 144 (115 ) (367 ) FFO 387 398 90 60 (127 ) 808 (341 ) 125 Depreciation and amortization (153 ) (217 ) (90 ) (46 ) — (506 ) 246 (115 ) (375 ) Deferred taxes (8 ) 21 14 14 12 53 (41 ) 14 26 Mark-to-market on hedging items and other (16 ) (67 ) (14 ) (13 ) 56 (54 ) 67 66 79 Share of earnings from associates — — — — — — 69 — 69 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (90 ) (90 ) Net income (loss) attributable to partnership (2) 210 135 — 15 (59 ) 301 — — 301 (1) The above table provides each segment’s results in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations accounted for using the consolidation and equity methods under IFRS. The above table reconciles Brookfield Infrastructure’s proportionate results to our partnership’s consolidated statements of operating results on a line by line basis by aggregating the components comprising the earnings from our partnership’s investments in associates and reflecting the portion of each line item attributable to non-controlling interests. (2) Net income (loss) attributable to our partnership includes net income (loss) attributable to non-controlling interests—Redeemable Partnership Units held by Brookfield, general partner and limited partners. Brookfield Infrastructure’s revenue arises from the rendering of services by the following operating segments: US$ MILLIONS 2017 2016 2015 Utilities Regulated Transmission $ 938 $ 27 $ 43 Regulated Terminal 301 299 330 Regulated Distribution 546 499 491 Transport Rail 296 270 316 Ports 681 360 220 Toll Roads 313 262 113 Energy Transmission & Storage 150 141 105 District Energy 310 257 237 $ 3,535 $ 2,115 $ 1,855
Summary of financial information by geographic regions	Revenues from external customers US$ MILLIONS 2017 2016 2015 Australia $ 1,093 $ 793 $ 699 Brazil 938 — — United Kingdom 565 566 635 Colombia 161 150 152 Canada 193 163 118 Chile 153 127 113 United States of America 183 154 138 India 57 39 — Peru 103 97 — New Zealand 89 26 — $ 3,535 $ 2,115 $ 1,855 Over 10% of our partnership’s revenue is from one customer. For the year ended December 31, 2017, revenue generated from this customer of the utilities segment was $938 million (2016: $ nil ). Non-current Assets US$ MILLIONS 2017 2016 Australia $ 5,770 $ 5,542 United Kingdom 4,431 3,739 Chile 2,045 1,748 Brazil 8,184 1,895 United States of America 2,818 2,470 Canada 1,468 1,252 Colombia 764 700 Europe 836 718 India 256 265 Peru 1,356 1,281 New Zealand 37 33 $ 27,965 $ 19,643

ACQUISITION OF BUSINESSES (Tabl

ACQUISITION OF BUSINESSES (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about business combination [abstract]
Disclosure of detailed information about business combinations	Consideration transferred US$ MILLIONS Cash $ 67 Senior notes (2) 141 Working capital credit facility 19 Total consideration $ 227 (1) The total consideration through the Brookfield-sponsored partnership includes $170 million cash, $357 million in fair value of the Senior notes and $48 million of a working capital facility. (2) On the date of acquisition of the North American gas storage operation Brookfield Infrastructure held a pre-existing interest in the Senior notes of $117 million , representing the original cost of $104 million and $13 million of income recorded as Other income on the Consolidated Statement of Operating Results in prior periods. On the acquisition date, Brookfield Infrastructure recorded an additional $24 million of Other income on the Consolidated Statement of Operating Results associated with the recycling of accumulated mark-to-market gains on revaluation of the Senior notes, which was equivalent to fair value. Fair value of assets and liabilities acquired as of July 19, 2016 US$ MILLIONS Cash and cash equivalents $ 15 Accounts receivable and other 99 Inventory 39 Property, plant and equipment 825 Goodwill 82 Deferred income tax and other liabilities (148 ) Non-recourse borrowings (337 ) Net assets acquired before non-controlling interest 575 Non-controlling interest (1) (348 ) Net assets acquired $ 227 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure and was measured at fair value on the acquisition date Consideration transferred US$ MILLIONS Cash $ 1,306 Consideration payable (1) 262 Total Consideration $ 1,568 Fair value of assets and liabilities acquired as of April 4, 2017: US$ MILLIONS Cash and cash equivalents $ 89 Accounts receivable and other 317 Intangible assets (2) 5,515 Goodwill 804 Accounts payable and other liabilities (202 ) Deferred income tax liabilities (946 ) Net assets acquired before non-controlling interest 5,577 Non-controlling interest (3) (4,009 ) Net assets acquired 1,568 (1) The deferred consideration is payable on the fifth anniversary of the date of acquisition and has therefore been initially recorded at fair value within non-current financial liabilities on the consolidated statements of financial position. The deferred consideration is denominated in U.S. dollars and accrues interest at 3.35% compounded annually. The financial liability will be subsequently measured at amortized cost. (2) Represents authorizations that expire between 2039 and 2041. (3) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. The following table summarizes the purchase price allocation of individually insignificant business combinations that have been completed during the twelve -month periods ended December 31, 2017 . US$ MILLIONS Cash $ 9 Consideration payable 18 Total consideration $ 27 Fair value of assets and liabilities acquired (provisional): US$ MILLIONS Accounts receivable and other $ 28 Goodwill 11 Property, plant and equipment 100 Deferred income tax and other liabilities (31 ) Non-recourse borrowings (30 ) Net assets acquired before non-controlling interest 78 Non-controlling interest (1) (51 ) Net assets acquired $ 27 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. Consideration transferred US$ MILLIONS Cash $ 13 Common shares of Asciano Limited 132 Total consideration $ 145 Fair value of assets and liabilities acquired as of August 18, 2016 US$ MILLIONS Cash and cash equivalents $ 12 Accounts receivable and other 233 Assets classified as held for sale (1) 115 Property, plant and equipment 225 Intangible assets 69 Goodwill 199 Liabilities directly associated with assets classified as held for sale (1) (58 ) Deferred income tax and other liabilities (109 ) Non-recourse borrowings (181 ) Net assets acquired before non-controlling interest 505 Non-controlling interest (2) (360 ) Net assets acquired $ 145 (1) $115 million of equity accounted investments and $58 million of non-recourse borrowings relate to a non-core business acquired as part of the acquisition of the Australian ports business which was sold in the fourth quarter of 2016. The net proceeds recorded approximated the carrying value of the business and therefore no gain or loss on disposition was recorded. (2) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date Consideration transferred US$ MILLIONS Cash $ 118 Consideration payable (1) 9 Total consideration $ 127 Fair value of assets and liabilities acquired as of June 28, 2016 US$ MILLIONS Cash and cash equivalents (2) $ 115 Accounts receivable and other 121 Property, plant and equipment 6 Intangible assets (3) 973 Goodwill 139 Deferred income tax and other liabilities (160 ) Non-recourse borrowings (441 ) Net assets acquired before non-controlling interest 753 Non-controlling interest (4) (626 ) Net assets acquired $ 127 (1) The purchase price is payable in a series of four payments, one on the date of acquisition as well as three equal payments made 18 months, 27 months and 36 months subsequent to this date and consequently an amount payable of $9 million is recorded as a financial liability within the consolidated statements of financial position as at December 31, 2016. (2) Includes $114 million of restricted cash primarily related to toll road construction obligations. (3) Represents a 30 year Peruvian toll road service concession agreement expiring in January 2043. The agreement obligates Rutas to maintain the toll roads to an acceptable standard in exchange for the ability to charge regulated tariffs to the users of the toll road. (4) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date Consideration transferred US$ MILLIONS Cash $ 42 Total consideration $ 42 Fair value of assets and liabilities acquired as of March 1, 2016 US$ MILLIONS Accounts receivable and other $ 38 Property, plant and equipment 7 Financial assets 142 Intangible assets 147 Deferred income tax assets 10 Accounts payable and other (38 ) Non-recourse borrowings (202 ) Net assets acquired before non-controlling interest 104 Non-controlling interest (1) (62 ) Net assets acquired $ 42 (1) Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date which is equal to the consideration paid by the non-controlling interest

FAIR VALUE OF FINANCIAL INSTR47

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Measurement [Abstract]
Disclosure of financial assets	The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2017 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 374 $ 374 Accounts receivable and other — — 838 838 Financial assets (current and non-current) (1) 608 57 172 837 Marketable securities — 85 — 85 Total $ 608 $ 142 $ 1,384 $ 2,134 Financial liabilities Corporate borrowings $ — $ — $ 2,101 $ 2,101 Non-recourse borrowings (current and non-current) — — 8,063 8,063 Accounts payable and other — — 864 864 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 440 — 873 1,313 Total $ 440 $ — $ 11,921 $ 12,361 (1) Derivative instruments which are elected for hedge accounting totaling $464 million are included in Financial assets and $146 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2016 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 786 $ 786 Accounts receivable and other — — 485 485 Financial assets (current and non-current) (1) 893 12 233 1,138 Marketable securities — 3 — 3 Total $ 893 $ 15 $ 1,504 $ 2,412 Financial liabilities Corporate borrowings $ — $ — $ 1,002 $ 1,002 Non-recourse borrowings (current and non-current) — — 7,324 7,324 Accounts payable and other — — 712 712 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 381 — — 381 Total $ 381 $ — $ 9,058 $ 9,439 (1) Derivative instruments which are elected for hedge accounting totaling $722 million are included in Financial assets and $185 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 10 $ 132 Loans and receivables 43 73 Marketable securities 85 3 Other 54 33 Total current $ 192 $ 241 Non-current: Cross currency interest rate swaps $ 243 $ 589 Loans and receivables 210 172 Foreign currency forward contracts 226 78 Other 51 61 Total non-current $ 730 $ 900
Disclosure of financial liabilities	The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2017 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 374 $ 374 Accounts receivable and other — — 838 838 Financial assets (current and non-current) (1) 608 57 172 837 Marketable securities — 85 — 85 Total $ 608 $ 142 $ 1,384 $ 2,134 Financial liabilities Corporate borrowings $ — $ — $ 2,101 $ 2,101 Non-recourse borrowings (current and non-current) — — 8,063 8,063 Accounts payable and other — — 864 864 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 440 — 873 1,313 Total $ 440 $ — $ 11,921 $ 12,361 (1) Derivative instruments which are elected for hedge accounting totaling $464 million are included in Financial assets and $146 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2016 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 786 $ 786 Accounts receivable and other — — 485 485 Financial assets (current and non-current) (1) 893 12 233 1,138 Marketable securities — 3 — 3 Total $ 893 $ 15 $ 1,504 $ 2,412 Financial liabilities Corporate borrowings $ — $ — $ 1,002 $ 1,002 Non-recourse borrowings (current and non-current) — — 7,324 7,324 Accounts payable and other — — 712 712 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 381 — — 381 Total $ 381 $ — $ 9,058 $ 9,439 (1) Derivative instruments which are elected for hedge accounting totaling $722 million are included in Financial assets and $185 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 150 $ 47 Other financial liabilities 87 182 Total current financial liabilities $ 237 $ 229 Non-current: Interest rate swaps $ 9 $ 34 Inflation swaps 84 97 Deferred consideration (1) 916 — Other financial liabilities 67 21 Total non-current financial liabilities $ 1,076 $ 152 (1) The deferred consideration is related to the acquisitions completed during 2017. See Note 5, Acquisition of Businesses for further details.
Carrying and fair values of financial assets	The following table provides the carrying values and fair values of financial instruments as at December 31, 2017 and December 31, 2016 : Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial assets Cash and cash equivalents $ 374 $ 374 $ 786 $ 786 Accounts receivable and other 838 838 485 485 Financial assets (current and non-current) 837 837 1,138 1,138 Marketable securities 85 85 3 3 Total $ 2,134 $ 2,134 $ 2,412 $ 2,412 During the year, no transfers were made between level 1 and 2 or level 2 and 3. The following table categorizes financial assets and liabilities, which are carried at fair value, based upon the level of input. Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 85 $ — $ — $ 3 $ — $ — Financial assets (current and non-current) — 617 48 — 863 42 Financial liabilities Financial liabilities (current and non-current) $ — $ 351 $ 89 $ — $ 335 $ 46 The fair value of our partnership’s financial assets and financial liabilities are measured at fair value on a recurring basis. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s financial assets and financial liabilities: US$ MILLIONS Fair value hierarchy Dec. 31, 2017 Dec. 31, 2016 Marketable securities Level 1 (1) $ 85 $ 3 Foreign currency forward contracts Level 2 (2) Financial asset $ 236 $ 210 Financial liability 196 48 Interest rate swaps & other Level 2 (2) Financial asset $ 381 $ 653 Financial liability 155 287 Other contracts Financial asset Level 3 (3) $ 48 $ 42 Financial liability Level 3 (3) 89 46 (1) Valuation technique: Quoted bid prices in an active market. (2) Valuation technique: Discounted cash flow. Future cash flows are estimated based on forward exchange rates (from observable forward exchange rates at the end of the reporting period) and contract forward rates, discounted at a rate that reflects our credit risk and the credit risk of various counterparties. (3) Valuation technique: Discounted cash flow. Future cash flows primarily driven by freight volumes and the use of assumptions concerning the amount and timing of estimated future cash flows and discount rates.
Carrying and fair values of financial liabilities	During the year, no transfers were made between level 1 and 2 or level 2 and 3. The following table categorizes financial assets and liabilities, which are carried at fair value, based upon the level of input. Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 85 $ — $ — $ 3 $ — $ — Financial assets (current and non-current) — 617 48 — 863 42 Financial liabilities Financial liabilities (current and non-current) $ — $ 351 $ 89 $ — $ 335 $ 46 Dec. 31, 2017 Dec. 31, 2016 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial liabilities Corporate borrowings (1) $ 2,101 $ 2,113 $ 1,002 $ 1,023 Non-recourse borrowings (2) 8,063 8,392 7,324 7,478 Accounts payable and other (current and non-current) 864 864 712 712 Preferred shares (3) 20 20 20 20 Financial liabilities (current and non-current) 1,313 1,313 381 381 $ 12,361 $ 12,702 $ 9,439 $ 9,614 (1) Corporate borrowings is classified under level 1 of the fair value hierarchy; quoted prices in an active market are available. (2) Non-recourse borrowings are classified under level 2 of the fair value hierarchy with the exception of certain borrowings at the U.K. port operation, Chilean toll road and Peruvian toll road which are classified under level 1. For level 2 fair values, future cash flows are estimated based on observable forward interest rates at the end of the reporting period. (3) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The fair value of our partnership’s financial assets and financial liabilities are measured at fair value on a recurring basis. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s financial assets and financial liabilities: US$ MILLIONS Fair value hierarchy Dec. 31, 2017 Dec. 31, 2016 Marketable securities Level 1 (1) $ 85 $ 3 Foreign currency forward contracts Level 2 (2) Financial asset $ 236 $ 210 Financial liability 196 48 Interest rate swaps & other Level 2 (2) Financial asset $ 381 $ 653 Financial liability 155 287 Other contracts Financial asset Level 3 (3) $ 48 $ 42 Financial liability Level 3 (3) 89 46 (1) Valuation technique: Quoted bid prices in an active market. (2) Valuation technique: Discounted cash flow. Future cash flows are estimated based on forward exchange rates (from observable forward exchange rates at the end of the reporting period) and contract forward rates, discounted at a rate that reflects our credit risk and the credit risk of various counterparties. (3) Valuation technique: Discounted cash flow. Future cash flows primarily driven by freight volumes and the use of assumptions concerning the amount and timing of estimated future cash flows and discount rates.

CASH AND CASH EQUIVALENTS (Tabl

CASH AND CASH EQUIVALENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Cash and cash equivalents [abstract]
Disclosure of cash and cash equivalents	US$ MILLIONS 2017 2016 Cash $ 258 $ 652 Restricted cash (1) 33 84 Cash equivalents (2) 83 50 Total cash and cash equivalents $ 374 $ 786 (1) Restricted cash primarily relates to our partnership’s financing arrangements, including debt service accounts. (2) Short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value.

FINANCIAL ASSETS (Tables)

FINANCIAL ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
Disclosure of financial assets	The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2017 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 374 $ 374 Accounts receivable and other — — 838 838 Financial assets (current and non-current) (1) 608 57 172 837 Marketable securities — 85 — 85 Total $ 608 $ 142 $ 1,384 $ 2,134 Financial liabilities Corporate borrowings $ — $ — $ 2,101 $ 2,101 Non-recourse borrowings (current and non-current) — — 8,063 8,063 Accounts payable and other — — 864 864 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 440 — 873 1,313 Total $ 440 $ — $ 11,921 $ 12,361 (1) Derivative instruments which are elected for hedge accounting totaling $464 million are included in Financial assets and $146 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2016 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 786 $ 786 Accounts receivable and other — — 485 485 Financial assets (current and non-current) (1) 893 12 233 1,138 Marketable securities — 3 — 3 Total $ 893 $ 15 $ 1,504 $ 2,412 Financial liabilities Corporate borrowings $ — $ — $ 1,002 $ 1,002 Non-recourse borrowings (current and non-current) — — 7,324 7,324 Accounts payable and other — — 712 712 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 381 — — 381 Total $ 381 $ — $ 9,058 $ 9,439 (1) Derivative instruments which are elected for hedge accounting totaling $722 million are included in Financial assets and $185 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 10 $ 132 Loans and receivables 43 73 Marketable securities 85 3 Other 54 33 Total current $ 192 $ 241 Non-current: Cross currency interest rate swaps $ 243 $ 589 Loans and receivables 210 172 Foreign currency forward contracts 226 78 Other 51 61 Total non-current $ 730 $ 900

ACCOUNTS RECEIVABLE AND OTHER (

ACCOUNTS RECEIVABLE AND OTHER (Tables)	12 Months Ended
	Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]
Disclosure of accounts receivable and other	US$ MILLIONS 2017 2016 Current: Accounts receivable $ 738 $ 395 Prepayments & other assets 100 109 Total current $ 838 $ 504 Non-current: Tax recovery receivables $ 52 $ 55 Other assets 221 110 Total non-current $ 273 $ 165

INVENTORY (Tables)

INVENTORY (Tables)	12 Months Ended
	Dec. 31, 2017
Inventories [Abstract]
Disclosure of current inventories	US$ MILLIONS 2017 2016 Current: Natural gas inventory $ 84 $ 82 Raw materials and consumables 24 19 Carrying amount of inventories $ 108 $ 101

INVESTMENT IN ASSOCIATES AND 52

INVESTMENT IN ASSOCIATES AND JOINT VENTURES (Tables)	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
Disclosure of ownership interest, voting interest, and carrying value of joint ventures	The following table presents the ownership interest and carrying values of Brookfield Infrastructure’s investments in associates and joint ventures: Name of entity Ownership and Voting Interest Carrying Value US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Dec. 31, 2017 Dec. 31, 2016 Brazilian toll road (1),(2) Arteris S.A. 45 % 49 % $ 1,715 $ 1,505 North American natural gas transmission operation (3),(4) Natural Gas Pipeline of America LLC 50 % 50 % 1,013 806 Chilean electricity transmission operation (5) 28 % 28 % 930 699 European telecommunications infrastructure operations TDF Infrastructure SAS 21 % 21 % 614 536 Brazilian rail business VLI S.A. 11 % 11 % 436 376 Australian ports operation (6) Patrick Terminals, held through PTH No 1 Pty Ltd 13 % 13 % 191 181 Other (7) 11%-50% 11%-50% 673 624 Total $ 5,572 $ 4,727 The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS 2017 2016 Balance at beginning of year $ 4,727 $ 2,973 Share of earnings for the year (3) 118 248 Foreign currency translation and other 167 219 Share of other comprehensive income 183 225 Distributions (66 ) (46 ) Disposition of interest (1) (177 ) — Acquisitions (2),(4),(5) 620 1,108 Balance at end of year $ 5,572 $ 4,727 \ (1) In August 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund, reorganized the holding entities of its investment in the Brazilian toll road operation. This transaction resulted in no gain or loss being recorded within the Consolidated Statements of Operating Results. The reorganization resulted in Brookfield Infrastructure no longer consolidating an 8% interest of the investment attributable to an institutional partner. The reorganization concurrently reduced the investments in associates and joint venture and non-controlling interest partnership capital balances by $177 million during the third quarter of 2017. (2) Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership interest to 45% . (3) Share of earnings for the year ended December 31, 2016 includes $195 million of non-recurring gains primarily related to our transport and energy operations. (4) In May 2017, Brookfield Infrastructure and its partner in its North American natural gas transmission operation each injected $200 million into the business to pay down operating level debt. A similar transaction was completed in April 2016 by Brookfield Infrastructure and its partner in the amount of $312 million . (5) During December 2017, our partnership signed an agreement to sell our ownership in ETC Transmission Holdings. Completion of this transaction is subject to certain closing conditions, third party consents and regulatory approvals. (6) In August 2016 , Brookfield Infrastructure expanded its ports operations in Australia as it acquired an effective 13% interest in PTH No 1 Pty Ltd (“Patrick”) through a Brookfield-sponsored infrastructure fund, alongside institutional partners, for total consideration of $202 million . The Brookfield consortium maintains 50% of the voting rights of Patrick in a joint venture with Qube Holdings Limited, along with its institutional partners. Brookfield Infrastructure has joint control through its position in the business. Accordingly, Brookfield Infrastructure equity accounts for the entity. (7) Other includes our partnership’s Texas electricity transmission project, Brazil electricity transmission operation, European port operation, North American west coast container terminal, U.S. gas storage operation and other investments in associates and joint ventures held through consolidated subsidiaries.
Disclosure of ownership interest, voting interest, and carrying value of associates	The following table presents the ownership interest and carrying values of Brookfield Infrastructure’s investments in associates and joint ventures: Name of entity Ownership and Voting Interest Carrying Value US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Dec. 31, 2017 Dec. 31, 2016 Brazilian toll road (1),(2) Arteris S.A. 45 % 49 % $ 1,715 $ 1,505 North American natural gas transmission operation (3),(4) Natural Gas Pipeline of America LLC 50 % 50 % 1,013 806 Chilean electricity transmission operation (5) 28 % 28 % 930 699 European telecommunications infrastructure operations TDF Infrastructure SAS 21 % 21 % 614 536 Brazilian rail business VLI S.A. 11 % 11 % 436 376 Australian ports operation (6) Patrick Terminals, held through PTH No 1 Pty Ltd 13 % 13 % 191 181 Other (7) 11%-50% 11%-50% 673 624 Total $ 5,572 $ 4,727 The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS 2017 2016 Balance at beginning of year $ 4,727 $ 2,973 Share of earnings for the year (3) 118 248 Foreign currency translation and other 167 219 Share of other comprehensive income 183 225 Distributions (66 ) (46 ) Disposition of interest (1) (177 ) — Acquisitions (2),(4),(5) 620 1,108 Balance at end of year $ 5,572 $ 4,727 \ (1) In August 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund, reorganized the holding entities of its investment in the Brazilian toll road operation. This transaction resulted in no gain or loss being recorded within the Consolidated Statements of Operating Results. The reorganization resulted in Brookfield Infrastructure no longer consolidating an 8% interest of the investment attributable to an institutional partner. The reorganization concurrently reduced the investments in associates and joint venture and non-controlling interest partnership capital balances by $177 million during the third quarter of 2017. (2) Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership interest to 45% . (3) Share of earnings for the year ended December 31, 2016 includes $195 million of non-recurring gains primarily related to our transport and energy operations. (4) In May 2017, Brookfield Infrastructure and its partner in its North American natural gas transmission operation each injected $200 million into the business to pay down operating level debt. A similar transaction was completed in April 2016 by Brookfield Infrastructure and its partner in the amount of $312 million . (5) During December 2017, our partnership signed an agreement to sell our ownership in ETC Transmission Holdings. Completion of this transaction is subject to certain closing conditions, third party consents and regulatory approvals. (6) In August 2016 , Brookfield Infrastructure expanded its ports operations in Australia as it acquired an effective 13% interest in PTH No 1 Pty Ltd (“Patrick”) through a Brookfield-sponsored infrastructure fund, alongside institutional partners, for total consideration of $202 million . The Brookfield consortium maintains 50% of the voting rights of Patrick in a joint venture with Qube Holdings Limited, along with its institutional partners. Brookfield Infrastructure has joint control through its position in the business. Accordingly, Brookfield Infrastructure equity accounts for the entity. (7) Other includes our partnership’s Texas electricity transmission project, Brazil electricity transmission operation, European port operation, North American west coast container terminal, U.S. gas storage operation and other investments in associates and joint ventures held through consolidated subsidiaries.
Disclosure of interests in associates	The following tables present the gross assets and liabilities of Brookfield Infrastructure’s investments in associates and joint ventures: As at December 31, 2017 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 304 $ 5,769 $ 6,073 $ 602 $ 2,102 $ 2,704 $ 3,369 $ 1,654 $ 1,715 North American natural gas transmission operation 139 4,741 4,880 139 2,716 2,855 2,025 1,012 1,013 Chilean electricity transmission operation 280 7,122 7,402 181 3,874 4,055 3,347 2,417 930 European telecommunications infrastructure operation 464 6,281 6,745 561 2,968 3,529 3,216 2,602 614 Brazilian rail business 743 6,131 6,874 515 2,405 2,920 3,954 3,518 436 Australian ports operation 198 2,281 2,479 24 1,332 1,356 1,123 932 191 Other 694 5,228 5,922 865 2,291 3,156 2,766 2,093 673 Total $ 2,822 $ 37,553 $ 40,375 $ 2,887 $ 17,688 $ 20,575 $ 19,800 $ 14,228 $ 5,572 As at December 31, 2016 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 263 $ 4,977 $ 5,240 $ 823 $ 1,665 $ 2,488 $ 2,752 $ 1,247 $ 1,505 North American natural gas transmission operation 122 5,767 5,889 1,353 2,925 4,278 1,611 805 806 Chilean electricity transmission operation 221 5,519 5,740 142 3,234 3,376 2,364 1,665 699 European telecommunications infrastructure operation 328 5,437 5,765 443 2,528 2,971 2,794 2,258 536 Brazilian rail business 460 5,265 5,725 674 1,645 2,319 3,406 3,030 376 Australian ports operation 171 2,166 2,337 66 1,229 1,295 1,042 861 181 Other 360 4,378 4,738 515 1,827 2,342 2,396 1,772 624 Total $ 1,925 $ 33,509 $ 35,434 $ 4,016 $ 15,053 $ 19,069 $ 16,365 $ 11,638 $ 4,727 The following tables present the gross amounts of revenue, net income, other comprehensive income from Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 928 $ 95 $ (39 ) $ 56 $ 19 $ 37 North American natural gas transmission operation 681 15 (1 ) 14 7 7 Chilean electricity transmission operation 441 37 806 843 609 234 European telecommunications infrastructure operation 783 58 435 493 409 84 Brazilian rail business 1,409 56 490 546 486 60 Australian ports operation 418 19 78 97 80 17 Other 1,809 98 (19 ) 79 55 24 Total $ 6,469 $ 378 $ 1,750 $ 2,128 $ 1,665 $ 463 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 766 $ 185 $ 382 $ 567 $ 275 $ 292 North American natural gas transmission operation 573 133 5 138 69 69 Chilean electricity transmission operation 433 38 217 255 184 71 European telecommunications infrastructure operation 767 121 376 497 393 104 Brazilian rail business 1,024 70 976 1,046 931 115 Australian ports operation 164 (31 ) (81 ) (112 ) (97 ) (15 ) Other 1,091 54 280 334 278 56 Total $ 4,818 $ 570 $ 2,155 $ 2,725 $ 2,033 $ 692 Year ended December 31, 2015 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 758 $ (12 ) $ (1,118 ) $ (1,130 ) $ (778 ) $ (352 ) North American natural gas transmission operation 522 (29 ) — (29 ) (19 ) (10 ) Chilean electricity transmission operation 432 75 (145 ) (70 ) (51 ) (19 ) European telecommunications infrastructure operation 579 62 72 134 104 30 Brazilian rail business 1,074 136 (668 ) (532 ) (474 ) (58 ) Other 947 94 212 306 241 65 Total $ 4,312 $ 326 $ (1,647 ) $ (1,321 ) $ (977 ) $ (344 ) The following tables present the cash flow activities of Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 345 $ (1,046 ) $ 800 $ 99 $ 57 $ 42 North American natural gas transmission operation 258 (169 ) (79 ) 10 5 5 Chilean electricity transmission operation 256 (240 ) 14 30 22 8 European telecommunications infrastructure operation 338 (226 ) (58 ) 54 43 11 Brazilian rail business 472 (458 ) 292 306 272 34 Australian ports operation 80 (15 ) (22 ) 43 40 3 Other 284 (729 ) 538 93 80 13 Total $ 2,033 $ (2,883 ) $ 1,485 $ 635 $ 519 $ 116 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 249 $ (491 ) $ 212 $ (30 ) $ (19 ) $ (11 ) North American natural gas transmission operation 163 (170 ) 2 (5 ) (2 ) (3 ) Chilean electricity transmission operation 273 (207 ) (27 ) 39 28 11 European telecommunications infrastructure operation 325 (323 ) (83 ) (81 ) (64 ) (17 ) Brazilian rail business 337 (780 ) 272 (171 ) (152 ) (19 ) Australian ports operation 15 (391 ) 433 57 47 10 Other 142 (229 ) 71 (16 ) (15 ) (1 ) Total $ 1,504 $ (2,591 ) $ 880 $ (207 ) $ (177 ) $ (30 ) Year ended December 31, 2015 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 194 $ (534 ) $ 59 $ (281 ) $ (194 ) $ (87 ) North American natural gas transmission operation 98 (157 ) 10 (49 ) (32 ) (17 ) Chilean electricity transmission operation 274 (122 ) (197 ) (45 ) (32 ) (13 ) European telecommunications infrastructure operation 253 (101 ) (19 ) 133 106 27 Brazilian rail business 309 (929 ) 588 (32 ) (29 ) (3 ) Other 154 (89 ) (36 ) 29 18 11 Total $ 1,282 $ (1,932 ) $ 405 $ (245 ) $ (163 ) $ (82 )
Disclosure of interests in joint ventures	The following tables present the gross assets and liabilities of Brookfield Infrastructure’s investments in associates and joint ventures: As at December 31, 2017 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 304 $ 5,769 $ 6,073 $ 602 $ 2,102 $ 2,704 $ 3,369 $ 1,654 $ 1,715 North American natural gas transmission operation 139 4,741 4,880 139 2,716 2,855 2,025 1,012 1,013 Chilean electricity transmission operation 280 7,122 7,402 181 3,874 4,055 3,347 2,417 930 European telecommunications infrastructure operation 464 6,281 6,745 561 2,968 3,529 3,216 2,602 614 Brazilian rail business 743 6,131 6,874 515 2,405 2,920 3,954 3,518 436 Australian ports operation 198 2,281 2,479 24 1,332 1,356 1,123 932 191 Other 694 5,228 5,922 865 2,291 3,156 2,766 2,093 673 Total $ 2,822 $ 37,553 $ 40,375 $ 2,887 $ 17,688 $ 20,575 $ 19,800 $ 14,228 $ 5,572 As at December 31, 2016 Total Attributable to US$ MILLIONS Current Assets Non- Current Assets Total Assets Current Liabilities Non- Current Liabilities Total Liabilities Total Net Assets Other Ownership Interests Partnership’s Share Brazilian toll road $ 263 $ 4,977 $ 5,240 $ 823 $ 1,665 $ 2,488 $ 2,752 $ 1,247 $ 1,505 North American natural gas transmission operation 122 5,767 5,889 1,353 2,925 4,278 1,611 805 806 Chilean electricity transmission operation 221 5,519 5,740 142 3,234 3,376 2,364 1,665 699 European telecommunications infrastructure operation 328 5,437 5,765 443 2,528 2,971 2,794 2,258 536 Brazilian rail business 460 5,265 5,725 674 1,645 2,319 3,406 3,030 376 Australian ports operation 171 2,166 2,337 66 1,229 1,295 1,042 861 181 Other 360 4,378 4,738 515 1,827 2,342 2,396 1,772 624 Total $ 1,925 $ 33,509 $ 35,434 $ 4,016 $ 15,053 $ 19,069 $ 16,365 $ 11,638 $ 4,727 The following tables present the gross amounts of revenue, net income, other comprehensive income from Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 928 $ 95 $ (39 ) $ 56 $ 19 $ 37 North American natural gas transmission operation 681 15 (1 ) 14 7 7 Chilean electricity transmission operation 441 37 806 843 609 234 European telecommunications infrastructure operation 783 58 435 493 409 84 Brazilian rail business 1,409 56 490 546 486 60 Australian ports operation 418 19 78 97 80 17 Other 1,809 98 (19 ) 79 55 24 Total $ 6,469 $ 378 $ 1,750 $ 2,128 $ 1,665 $ 463 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 766 $ 185 $ 382 $ 567 $ 275 $ 292 North American natural gas transmission operation 573 133 5 138 69 69 Chilean electricity transmission operation 433 38 217 255 184 71 European telecommunications infrastructure operation 767 121 376 497 393 104 Brazilian rail business 1,024 70 976 1,046 931 115 Australian ports operation 164 (31 ) (81 ) (112 ) (97 ) (15 ) Other 1,091 54 280 334 278 56 Total $ 4,818 $ 570 $ 2,155 $ 2,725 $ 2,033 $ 692 Year ended December 31, 2015 Total Attributable to US$ MILLIONS Revenue Net Income OCI Total Comprehensive Income Other Ownership Interests Partnership’s Share Brazilian toll road $ 758 $ (12 ) $ (1,118 ) $ (1,130 ) $ (778 ) $ (352 ) North American natural gas transmission operation 522 (29 ) — (29 ) (19 ) (10 ) Chilean electricity transmission operation 432 75 (145 ) (70 ) (51 ) (19 ) European telecommunications infrastructure operation 579 62 72 134 104 30 Brazilian rail business 1,074 136 (668 ) (532 ) (474 ) (58 ) Other 947 94 212 306 241 65 Total $ 4,312 $ 326 $ (1,647 ) $ (1,321 ) $ (977 ) $ (344 ) The following tables present the cash flow activities of Brookfield Infrastructure’s investments in associates and joint ventures for the years ended December 31, 2017 , 2016 , and 2015 : Year ended December 31, 2017 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 345 $ (1,046 ) $ 800 $ 99 $ 57 $ 42 North American natural gas transmission operation 258 (169 ) (79 ) 10 5 5 Chilean electricity transmission operation 256 (240 ) 14 30 22 8 European telecommunications infrastructure operation 338 (226 ) (58 ) 54 43 11 Brazilian rail business 472 (458 ) 292 306 272 34 Australian ports operation 80 (15 ) (22 ) 43 40 3 Other 284 (729 ) 538 93 80 13 Total $ 2,033 $ (2,883 ) $ 1,485 $ 635 $ 519 $ 116 Year ended December 31, 2016 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 249 $ (491 ) $ 212 $ (30 ) $ (19 ) $ (11 ) North American natural gas transmission operation 163 (170 ) 2 (5 ) (2 ) (3 ) Chilean electricity transmission operation 273 (207 ) (27 ) 39 28 11 European telecommunications infrastructure operation 325 (323 ) (83 ) (81 ) (64 ) (17 ) Brazilian rail business 337 (780 ) 272 (171 ) (152 ) (19 ) Australian ports operation 15 (391 ) 433 57 47 10 Other 142 (229 ) 71 (16 ) (15 ) (1 ) Total $ 1,504 $ (2,591 ) $ 880 $ (207 ) $ (177 ) $ (30 ) Year ended December 31, 2015 Total Attributable to US$ MILLIONS Operating Investing Financing Total Cash Flows Other Ownership Interests Partnership’s Share Brazilian toll road $ 194 $ (534 ) $ 59 $ (281 ) $ (194 ) $ (87 ) North American natural gas transmission operation 98 (157 ) 10 (49 ) (32 ) (17 ) Chilean electricity transmission operation 274 (122 ) (197 ) (45 ) (32 ) (13 ) European telecommunications infrastructure operation 253 (101 ) (19 ) 133 106 27 Brazilian rail business 309 (929 ) 588 (32 ) (29 ) (3 ) Other 154 (89 ) (36 ) 29 18 11 Total $ 1,282 $ (1,932 ) $ 405 $ (245 ) $ (163 ) $ (82 )

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Property, plant and equipment [abstract]
Disclosure of detailed information about property, plant and equipment	Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows: Buildings Up to 70 years Transmission stations, towers and related fixtures Up to 40 years Leasehold improvements Up to 50 years Plant and equipment Up to 40 years Network systems Up to 60 years Track Up to 40 years District energy systems Up to 50 years Gas storage assets Up to 50 years The following table summarizes the carrying amount of property, plant and equipment that would have been recognized had assets been carried under the cost model. US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Utilities $ 2,961 $ 2,512 Transport 1,970 1,845 Energy 2,246 2,122 The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s property, plant and equipment assets, categorized by segment. Dec. 31, 2017 Dec. 31, 2016 Segment Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Valuation Technique Discount Rate Terminal Value Multiple Investment Horizon Utilities Discounted cash flow model 7% to 12% 7x to 21x 10 to 20 yrs Discounted cash flow model 7% to 12% 7x to 18x 10 to 20 yrs Transport Discounted cash flow model 10% to 15% 9x to 14x 10 to 20 yrs Discounted cash flow model 10% to 17% 8x to 14x 10 to 20 yrs Energy Discounted cash flow model 12% to 15% 8x to 13x 10 yrs Discounted cash flow model 9% to 14% 10x to 12x 10 yrs US$ MILLIONS Utility Assets Transport Assets Energy Assets Total Assets Gross Carrying Amount: Balance at January 1, 2016 $ 2,945 $ 2,150 $ 1,457 $ 6,552 Additions, net of disposals 399 76 89 564 Non-cash (disposals) additions (31 ) 3 — (28 ) Acquisitions through business combinations (1) — 242 825 1,067 Net foreign currency exchange differences (418 ) (109 ) 9 (518 ) Balance at December 31, 2016 $ 2,895 $ 2,362 $ 2,380 $ 7,637 Additions, net of disposals 349 104 95 548 Non-cash disposals — — (14 ) (14 ) Acquisitions through business combinations (1) — — 100 100 Net foreign currency exchange differences 227 191 68 486 Balance at December 31, 2017 $ 3,471 $ 2,657 $ 2,629 $ 8,757 Accumulated depreciation: Balance at January 1, 2016 $ (291 ) $ (418 ) $ (159 ) $ (868 ) Depreciation expense (128 ) (127 ) (99 ) (354 ) Non-cash disposals — 4 — 4 Net foreign currency exchange differences 36 24 — 60 Balance at December 31, 2016 $ (383 ) $ (517 ) $ (258 ) $ (1,158 ) Depreciation expense (118 ) (147 ) (117 ) (382 ) Disposals 19 21 — 40 Non-cash disposals — — 5 5 Net foreign currency exchange differences (28 ) (44 ) (13 ) (85 ) Balance at December 31, 2017 $ (510 ) $ (687 ) $ (383 ) $ (1,580 ) Accumulated fair value adjustments: Balance at January 1, 2016 $ 945 $ 777 $ 226 $ 1,948 Fair value adjustments 185 25 125 335 Net foreign currency exchange differences (87 ) (20 ) 1 (106 ) Balance at December 31, 2016 $ 1,043 $ 782 $ 352 $ 2,177 Fair value adjustments 137 24 257 418 Net foreign currency exchange differences 78 67 20 165 Balance at December 31, 2017 $ 1,258 $ 873 $ 629 $ 2,760 Net book value: December 31, 2017 $ 4,219 $ 2,843 $ 2,875 $ 9,937 December 31, 2016 $ 3,555 $ 2,627 $ 2,474 $ 8,656 (1) See Note 5 , Acquisition of Business for additional information.

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Intangible Assets [Abstract]
Disclosure of detailed information about intangible assets	US$ MILLIONS 2017 2016 Cost $ 10,470 $ 4,732 Accumulated amortization (576 ) (267 ) Net intangible assets $ 9,894 $ 4,465 Intangible assets are allocated to the following cash generating units: US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Brazilian regulated gas transmission operation $ 5,134 $ — Australian regulated terminal 1,957 1,817 Peruvian toll roads 1,144 1,049 Chilean toll roads 1,100 1,054 U.K. port operation 289 265 Indian toll roads 130 136 Other 140 144 Total $ 9,894 $ 4,465
Disclosure of reconciliation of changes in intangible assets and goodwill	The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets: US$ MILLIONS 2017 2016 Accumulated amortization at beginning of year $ (267 ) $ (189 ) Amortization (289 ) (93 ) Foreign currency translation (20 ) 15 Accumulated amortization at end of year $ (576 ) $ (267 ) The following table presents the change in the cost balance of intangible assets: US$ MILLIONS 2017 2016 Cost at beginning of the year $ 4,732 $ 3,485 Additions, net of disposals 79 116 Acquisitions through business combinations (1) 5,515 1,189 Non-cash additions 18 — Foreign currency translation 126 (58 ) Cost at end of year $ 10,470 $ 4,732 (1) See Note 5 , Acquisition of Business for additional information. The following table presents the carrying amount for Brookfield Infrastructure’s goodwill: US$ MILLIONS 2017 2016 Balance at beginning of the year $ 502 $ 79 Acquisitions through business combinations (1) 815 431 Foreign currency translation and other (16 ) (8 ) Balance at end of the year $ 1,301 $ 502 (1) See Note 5 , Acquisition of Business for additional information.

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Dec. 31, 2017
Intangible Assets [Abstract]
Disclosure of reconciliation of changes in intangible assets and goodwill	The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets: US$ MILLIONS 2017 2016 Accumulated amortization at beginning of year $ (267 ) $ (189 ) Amortization (289 ) (93 ) Foreign currency translation (20 ) 15 Accumulated amortization at end of year $ (576 ) $ (267 ) The following table presents the change in the cost balance of intangible assets: US$ MILLIONS 2017 2016 Cost at beginning of the year $ 4,732 $ 3,485 Additions, net of disposals 79 116 Acquisitions through business combinations (1) 5,515 1,189 Non-cash additions 18 — Foreign currency translation 126 (58 ) Cost at end of year $ 10,470 $ 4,732 (1) See Note 5 , Acquisition of Business for additional information. The following table presents the carrying amount for Brookfield Infrastructure’s goodwill: US$ MILLIONS 2017 2016 Balance at beginning of the year $ 502 $ 79 Acquisitions through business combinations (1) 815 431 Foreign currency translation and other (16 ) (8 ) Balance at end of the year $ 1,301 $ 502 (1) See Note 5 , Acquisition of Business for additional information.

INVESTMENT PROPERTIES (Tables)

INVESTMENT PROPERTIES (Tables)	12 Months Ended
	Dec. 31, 2017
Investment property [abstract]
Disclosure of detailed information about investment property	The following table presents the carrying amount for Brookfield Infrastructure’s investment properties: US$ MILLIONS 2017 2016 Balance at beginning of the year $ 154 $ 153 Additions, net of disposals — 3 Non-cash additions — 10 Fair value adjustments 23 12 Foreign currency translation 15 (24 ) Balance at end of the year $ 192 $ 154 Our partnership has classified all assets below under level 3 of the fair value hierarchy: Segment Valuation technique Significant unobservable inputs Range of inputs Transport Direct Income Capitalization Capitalization Rate 6% to 14%

ACCOUNTS PAYABLE AND OTHER (Tab

ACCOUNTS PAYABLE AND OTHER (Tables)	12 Months Ended
	Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]
Disclosure of accounts payable and other	US$ MILLIONS Note 2017 2016 Current: Accounts payable (1) $ 246 $ 266 Accrued & other liabilities 400 274 Deferred revenue (i) 159 108 Provisions 59 64 Total current $ 864 $ 712 Non-current: Deferred revenue (i) $ 300 $ 293 Pension liabilities (2) 100 98 Provisions 95 41 Other liabilities 298 148 Total non-current $ 793 $ 580 (1) The average credit period on purchases of goods and services is 30 days. No interest is incurred on trade creditors. Brookfield Infrastructure has financial risk management policies in place to ensure that all payables are paid within the pre-agreed credit terms. (2) See Note 31 , Retirement Benefit Plans for further details.

FINANCIAL LIABILITIES (Tables)

FINANCIAL LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
Disclosure of financial liabilities	The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2017 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 374 $ 374 Accounts receivable and other — — 838 838 Financial assets (current and non-current) (1) 608 57 172 837 Marketable securities — 85 — 85 Total $ 608 $ 142 $ 1,384 $ 2,134 Financial liabilities Corporate borrowings $ — $ — $ 2,101 $ 2,101 Non-recourse borrowings (current and non-current) — — 8,063 8,063 Accounts payable and other — — 864 864 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 440 — 873 1,313 Total $ 440 $ — $ 11,921 $ 12,361 (1) Derivative instruments which are elected for hedge accounting totaling $464 million are included in Financial assets and $146 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the break down of financial instruments and their associated financial instrument classifications as at December 31, 2016 : US$ MILLIONS FVTPL Available for sale securities Loans and Receivables/ Other Liabilities Financial Instrument Classification (Fair Value) (Fair Value through OCI) (Amortized Cost) Total MEASUREMENT BASIS Financial assets Cash and cash equivalents $ — $ — $ 786 $ 786 Accounts receivable and other — — 485 485 Financial assets (current and non-current) (1) 893 12 233 1,138 Marketable securities — 3 — 3 Total $ 893 $ 15 $ 1,504 $ 2,412 Financial liabilities Corporate borrowings $ — $ — $ 1,002 $ 1,002 Non-recourse borrowings (current and non-current) — — 7,324 7,324 Accounts payable and other — — 712 712 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 381 — — 381 Total $ 381 $ — $ 9,058 $ 9,439 (1) Derivative instruments which are elected for hedge accounting totaling $722 million are included in Financial assets and $185 million of derivative instruments are included in Financial liabilities. (2) $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. US$ MILLIONS 2017 2016 Current: Foreign currency forward contracts $ 150 $ 47 Other financial liabilities 87 182 Total current financial liabilities $ 237 $ 229 Non-current: Interest rate swaps $ 9 $ 34 Inflation swaps 84 97 Deferred consideration (1) 916 — Other financial liabilities 67 21 Total non-current financial liabilities $ 1,076 $ 152 (1) The deferred consideration is related to the acquisitions completed during 2017. See Note 5, Acquisition of Businesses for further details.

BORROWINGS (Tables)

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
Disclosure of detailed information about borrowings	The current and non-current balances of non-recourse borrowings are as follows: US$ MILLIONS Dec. 31, 2017 Dec. 31, 2016 Current $ 364 $ 279 Non-current 7,699 7,045 Total $ 8,063 $ 7,324 Maturity Annual Rate Currency 2017 2016 Corporate revolving credit facility June 30, 2022 LIBOR plus 1.2% US$ 789 — Medium Term Notes (1) : Current: Public - Canadian October 10, 2017 3.5% C$ — 295 Public - Canadian October 30, 2018 3.0% C$ 99 93 Non-Current: Public - Canadian October 30, 2020 3.5% C$ 298 279 Public - Canadian March 11, 2022 3.5% C$ 358 335 Public - Canadian February 22, 2024 3.3% C$ 239 — Public - Canadian February 22, 2024 3.3% C$ 318 — Total $ 2,101 $ 1,002 (1) See Note 19 , Subsidiary Public Issuers for further details. Principal repayments on non-recourse borrowings due over the next five years and thereafter are as follows: US$ MILLIONS Utilities Transport Energy Total 2018 — 143 229 372 2019 87 261 222 570 2020 304 210 69 583 2021 461 230 4 695 2022 440 323 4 767 Thereafter 2,358 2,095 647 5,100 Total Principal repayments 3,650 3,262 1,175 8,087 Deferred financing costs and other (1 ) (5 ) (18 ) (24 ) Total - Dec. 31, 2017 $ 3,649 $ 3,257 $ 1,157 $ 8,063 Total - Dec. 31, 2016 $ 3,207 $ 3,163 $ 954 $ 7,324 The weighted average interest rate of non-recourse borrowings are as follows: US$ MILLIONS Utilities Transport Energy Total Dec. 31, 2017 4 % 5 % 5 % 5 % Dec. 31, 2016 4 % 5 % 5 % 5 % Principal repayments on non-recourse borrowings in their local currency are as follows: US$ MILLIONS, except as noted Dec. 31, 2017 Local Currency Dec. 31, 2016 Local Currency Australian dollars $ 1,013 AUD 1,297 $ 922 AUD 1,281 British pounds 1,735 GBP 1,283 1,390 GBP 1,125 U.S. dollars 3,087 USD 3,087 3,039 USD 3,039 Chilean Unidad de Fomento (1) 960 UF 22 901 UF 23 Canadian dollars 397 CAD 499 263 CAD 354 Colombian pesos 184 COP 549,384 133 COP 403,030 Peruvian soles 458 PEN 1,483 439 PEN 1,473 Indian rupees 186 INR 11,847 196 INR 13,324 New Zealand dollars 43 NZD 61 41 NZD 59 (1) Chilean Unidad de Fomento is an inflation adjusted unit of account indexed to the Chilean Peso.
Disclosure of reconciliation of liabilities arising from financing activities	Details of the “Changes in liabilities from financing activities”, including both changes arising from cash flows and non-cash changes are as follows: US$ MILLIONS 2016 Cash Flows Acquisition Foreign Exchange Movement Fair Value Changes 2017 Corporate borrowings $ 1,002 $ 1,020 $ — $ 79 $ — $ 2,101 Non-recourse borrowings 7,324 360 — 379 — 8,063

SUBSIDIARY PUBLIC ISSUERS (Tabl

SUBSIDIARY PUBLIC ISSUERS (Tables)	12 Months Ended
	Dec. 31, 2017
Subsidiary Public Issuer [Abstract]
Condensed Financial Information	The following tables set forth consolidated summary financial information for our partnership and the Issuers: For the year ended December 31, 2017 Our partnership (2) The Issuers Subsidiaries of our partnership other than the Issuers (3) Consolidating adjustments (4) Our partnership consolidated Revenues $ — $ — $ — $ 3,535 $ 3,535 Net income attributable to partnership (1) 11 — 125 (11 ) 125 For the year ended December 31, 2016 Revenues $ — $ — $ — $ 2,115 $ 2,115 Net income attributable to partnership (1) 285 — 487 (285 ) 487 For the year ended December 31, 2015 Revenues $ — $ — $ — $ 1,855 $ 1,855 Net income attributable to partnership (1) 169 — 301 (169 ) 301 As at December 31, 2017 Current assets $ — $ — $ — $ 1,512 $ 1,512 Non-current assets 5,514 — 5,987 16,464 27,965 Current liabilities — — — 1,564 1,564 Non-current liabilities — 1,313 — 13,126 14,439 Non-controlling interests—Redeemable Partnership Units held by Brookfield — — — 2,012 2,012 Non-controlling interests—in operating subsidiaries — — — 5,875 5,875 Preferred unitholders — — — 595 595 As at December 31, 2016 Current assets $ — $ 3 $ — $ 1,629 $ 1,632 Non-current assets 4,937 297 5,248 9,161 19,643 Current liabilities — 5 — 1,510 1,515 Non-current liabilities — 1,004 — 9,112 10,116 Non-controlling interests—Redeemable Partnership Units held by Brookfield — — — 1,860 1,860 Non-controlling interests—in operating subsidiaries — — — 2,771 2,771 Preferred unitholders — — — 375 375 (1) Includes net income attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. (2) Includes investments in all subsidiaries of our partnership under the equity method. (3) Includes investments in all subsidiaries of the Holding LP, Brookfield Infrastructure Holdings (Canada) Inc., Brookfield Infrastructure US Holdings I Corporation and BIP Bermuda Holdings I Limited under the equity method. (4) Includes elimination of intercompany transactions and balances necessary to present our partnership on a consolidated basis.

REVENUES (Tables)

REVENUES (Tables)	12 Months Ended
	Dec. 31, 2017
Revenue [abstract]
Disclosure of revenues	The following is an analysis of Brookfield Infrastructure’s assets by reportable operating segment for the years under review: Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 6,542 $ 6,990 $ 3,134 $ 1,049 $ (1,083 ) $ 16,632 $ (3,134 ) $ 11,668 $ 4,311 $ 29,477 Total Attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials on F-5 (1) AS AT Utilities Transport Energy Comm. Infrastructure Corporate Brookfield Infrastructure Total assets $ 4,605 $ 6,160 $ 3,032 $ 933 $ (510 ) $ 14,220 $ (2,996 ) $ 6,496 $ 3,555 $ 21,275 (1) The above table provides each segment’s assets in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations using consolidation and the equity method whereby our partnership either controls or exercises significant influence over the investment respectively. The above table reconciles Brookfield Infrastructure’s proportionate assets to total assets presented on our partnership’s Consolidated Statements of Financial Position by removing net liabilities contained within investments in associates and joint ventures and reflecting the assets attributable to non-controlling interests, and adjusting for working capital assets which are netted against working capital liabilities. FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 988 $ 1,589 $ 559 $ 165 $ — $ 3,301 $ (1,624 ) $ 1,858 $ 3,535 Costs attributed to revenues (250 ) (895 ) (278 ) (75 ) — (1,498 ) 861 (872 ) (1,509 ) General and administrative costs — — — — (239 ) (239 ) — — (239 ) Adjusted EBITDA 738 694 281 90 (239 ) 1,564 (763 ) 986 Other (expense) income (14 ) (4 ) 15 (2 ) 45 40 7 (108 ) (61 ) Interest expense (114 ) (158 ) (87 ) (12 ) (63 ) (434 ) 172 (166 ) (428 ) FFO 610 532 209 76 (257 ) 1,170 (584 ) 712 Depreciation and amortization (186 ) (312 ) (151 ) (77 ) — (726 ) 382 (327 ) (671 ) Deferred taxes (52 ) (1 ) 11 21 14 (7 ) (22 ) (38 ) (67 ) Mark-to-market on hedging items and other (59 ) (80 ) (37 ) (9 ) (127 ) (312 ) 106 124 (82 ) Share of earnings from associates — — — — — — 118 — 118 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (471 ) (471 ) Net income (loss) attributable to partnership (2) $ 313 $ 139 $ 32 $ 11 $ (370 ) $ 125 $ — $ — $ 125 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues $ 684 $ 1,247 $ 496 $ 163 $ — $ 2,590 $ (1,311 ) $ 836 $ 2,115 Costs attributed to revenues (160 ) (650 ) (220 ) (72 ) — (1,102 ) 651 (612 ) (1,063 ) General and administrative costs — — — — (166 ) (166 ) — — (166 ) Adjusted EBITDA 524 597 276 91 (166 ) 1,322 (660 ) 224 Other income (expense) 5 (17 ) 8 (2 ) 84 78 16 1 95 Interest expense (130 ) (157 ) (109 ) (12 ) (48 ) (456 ) 190 (126 ) (392 ) FFO 399 423 175 77 (130 ) 944 (454 ) 99 Depreciation and amortization (154 ) (253 ) (128 ) (74 ) — (609 ) 328 (166 ) (447 ) Deferred taxes 5 26 (38 ) 29 (17 ) 5 9 4 18 Mark-to-market on hedging items and other (88 ) 10 81 (5 ) 149 147 (131 ) 117 133 Share of earnings from associates — — — — — — 248 — 248 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (54 ) (54 ) Net income (loss) attributable to partnership (2) $ 162 $ 206 $ 90 $ 27 $ 2 $ 487 $ — $ — $ 487 FOR THE YEAR ENDED Total attributable to Brookfield Infrastructure Contribution from investments in associates Attributable to non- controlling interest As per IFRS financials on F-6 (1) Utilities Transport Energy Comm. Infrastructure Corporate Total Revenues 698 1,143 349 123 — 2,313 (1,044 ) 586 1,855 Costs attributed to revenues (174 ) (588 ) (183 ) (57 ) — (1,002 ) 546 (342 ) (798 ) General and administrative costs — — — — (134 ) (134 ) — — (134 ) Adjusted EBITDA 524 555 166 66 (134 ) 1,177 (498 ) 244 Other income (expense) 5 (15 ) 3 — 34 27 13 (4 ) 36 Interest expense (142 ) (142 ) (79 ) (6 ) (27 ) (396 ) 144 (115 ) (367 ) FFO 387 398 90 60 (127 ) 808 (341 ) 125 Depreciation and amortization (153 ) (217 ) (90 ) (46 ) — (506 ) 246 (115 ) (375 ) Deferred taxes (8 ) 21 14 14 12 53 (41 ) 14 26 Mark-to-market on hedging items and other (16 ) (67 ) (14 ) (13 ) 56 (54 ) 67 66 79 Share of earnings from associates — — — — — — 69 — 69 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (90 ) (90 ) Net income (loss) attributable to partnership (2) 210 135 — 15 (59 ) 301 — — 301 (1) The above table provides each segment’s results in the format that management organizes its segments to make operating decisions and assess performance. Each segment is presented on a proportionate basis, taking into account Brookfield Infrastructure’s ownership in operations accounted for using the consolidation and equity methods under IFRS. The above table reconciles Brookfield Infrastructure’s proportionate results to our partnership’s consolidated statements of operating results on a line by line basis by aggregating the components comprising the earnings from our partnership’s investments in associates and reflecting the portion of each line item attributable to non-controlling interests. (2) Net income (loss) attributable to our partnership includes net income (loss) attributable to non-controlling interests—Redeemable Partnership Units held by Brookfield, general partner and limited partners. Brookfield Infrastructure’s revenue arises from the rendering of services by the following operating segments: US$ MILLIONS 2017 2016 2015 Utilities Regulated Transmission $ 938 $ 27 $ 43 Regulated Terminal 301 299 330 Regulated Distribution 546 499 491 Transport Rail 296 270 316 Ports 681 360 220 Toll Roads 313 262 113 Energy Transmission & Storage 150 141 105 District Energy 310 257 237 $ 3,535 $ 2,115 $ 1,855

INTEREST EXPENSE (Tables)

INTEREST EXPENSE (Tables)	12 Months Ended
	Dec. 31, 2017
Analysis of income and expense [abstract]
Disclosure of interest expense	US$ MILLIONS 2017 2016 2015 Interest on corporate facility $ 12 $ 12 $ 5 Interest on corporate debt 51 39 22 Interest on non-recourse borrowings 361 338 334 Other financing fees 4 3 6 $ 428 $ 392 $ 367

NON-WHOLLY OWNED SUBSIDIARIES (

NON-WHOLLY OWNED SUBSIDIARIES (Tables)	12 Months Ended
	Dec. 31, 2017
Interests In Other Entities [Abstract]
Summarized accounts for non-wholly owned subsidiaries	The following provides information about our partnership’s wholly-owned subsidiaries as of December 31, 2017 and 2016 : Ownership interest (%) Country of incorporation Defined Name Name of entity 2017 2016 Transport Australian rail operation Arc Infrastructure Holdings No. 1 Pty Ltd Australia 100 100 Energy Australian energy distribution operation Tas Gas Networks Pty Ltd Australia 100 100 The following table presents details of non-wholly owned subsidiaries of our partnership: Ownership Interest (%) Voting interest (%) Country of incorporation Defined Name Name of entity 2017 2016 2017 2016 Utilities U.K. regulated distribution operation BUUK Infrastructure Holdings Limited U.K. 80 80 80 80 Australian regulated terminal operation DBCT Management Pty Ltd (1) Australia 71 71 100 100 Colombian regulated distribution operation Empresa de Energia de Boyaca S.A. (1) Colombia 17 17 100 100 Brazilian regulated gas transmission operation Nova Transportadora do Sudeste (1),(2) Brazil 28 — 90 — Transport U.K. ports operation Brookfield Port Acquisitions (UK) Limited (1) U.K. 59 59 100 100 Australian ports operation Linx Cargo Care Group Pty Ltd (1),(3) Australia 27 27 67 67 Chilean toll roads Sociedad Concesionaria Vespucio Norte Express S.A. (1) Chile 51 51 89 89 Indian toll roads BIF India Holdings Pte Ltd (1),(4) Singapore 40 40 93 93 Peruvian toll roads Rutas de Lima S.A.C (1),(5) Peru 17 17 57 57 Energy North American gas storage operation (6) Warwick Gas Storage L.P. (1) Canada 25 25 100 100 Canadian district energy operation Enwave Energy Corporation (1) Canada 25 25 100 100 U.S. district energy operation Enwave USA (1) U.S. 40 40 100 100 North American gas storage operation (6) Lodi Gas Storage (1) U.S. 40 40 100 100 North American gas storage operation (6) Rockpoint Gas Storage Partners (1),(7) U.S. 40 40 100 100 Corporate & Other Holding LP Brookfield Infrastructure L.P. Bermuda 70 70 100 100 (1) For the above noted subsidiaries, our partnership has entered into voting arrangements to provide our partnership with the ability to direct the relevant activities of the investee. Our partnership controls these investees given that our partnership is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Our partnership exercises judgment to determine the level of variability that will achieve control over an investee, particularly in circumstances where our partnership’s voting interest differs from its ownership interest in an investee. The following were considered to determine whether our partnership controls these investees: the degree of power (if any) held by other investors, the degree of exposure to variability of each investor, the determination of whether any general partner removal rights are substantive and the purpose and design of the investee. (2) In April 2017, Brookfield Infrastructure, alongside institutional partners and a Brookfield-sponsored infrastructure fund (the “consortium”), acquired an effective 28% interest in Nova Transportadora do Sudeste S.A. (“NTS”), a Brazilian regulated gas transmission business, for total consideration of $1.6 billion . (3) In August 2016, Brookfield Infrastructure expanded its ports business to Australia as it acquired a 27% interest in Linx Cargo Care Group Pty Ltd through a Brookfield-sponsored infrastructure fund, along with institutional partners (the “Brookfield Consortium”) for total consideration of $145 million . (4) In March 2016 , Brookfield Infrastructure acquired a 40% interest in a toll road business in India from Gammon Infrastructure Projects Limited for consideration of $42 million through a Brookfield-sponsored infrastructure fund. (5) In June 2016 , Brookfield Infrastructure acquired a 17% interest in Rutas de Lima S.A.C. for total consideration of $127 million through a Brookfield-sponsored infrastructure fund. (6) North American gas storage operations include Warwick Gas Storage L.P., Lodi Gas Storage and Rockpoint Gas Storage Partners L.P. (7) In July 2016, Brookfield Infrastructure acquired a 40% interest in Rockpoint Gas Storage Partners L.P. for consideration of $227 million through a Brookfield-sponsored infrastructure fund. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Financial Position: As of December 31, 2017 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 107 $ 3,550 $ 281 $ 2,261 $ 217 $ 898 Australian regulated terminal 38 2,229 34 2,035 62 136 Colombian regulated distribution 68 764 26 438 302 66 Brazilian regulated gas transmission operation 322 5,990 73 2,015 3,081 1,143 Transport U.K. port operation 44 880 133 353 179 259 Australian port operation 163 628 101 218 346 126 Chilean toll roads 84 1,116 59 989 75 77 Peruvian toll roads 101 1,356 18 674 644 121 Indian toll roads 58 256 30 185 60 39 Energy North American gas storage operation 206 1,259 244 409 502 310 Canadian district energy operation 75 699 55 394 243 82 U.S. district energy operation 37 799 19 668 78 71 Corporate & Other Holding LP and other 127 244 392 2,060 84 (2,165 ) Total $ 1,430 $ 19,770 $ 1,465 $ 12,699 $ 5,873 $ 1,163 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. As of December 31, 2016 US$ MILLIONS Current Assets Non-Current Assets Current Liabilities Non-Current Liabilities Non-Controlling Interest in Operating Subsidiaries Partnership Capital (1) Utilities U.K. regulated distribution $ 65 $ 2,985 $ 154 $ 1,919 $ 183 $ 794 Australian regulated terminal 27 2,162 (9 ) 1,926 70 202 Colombian regulated distribution 55 701 27 369 294 66 Transport U.K. port operation 42 754 108 324 150 214 Australian port operation 142 587 94 205 315 115 Chilean toll roads 102 1,069 50 941 89 91 Brazilian toll roads 42 466 27 — 189 292 Peruvian toll roads 127 1,261 27 635 610 116 Indian toll roads 52 264 36 186 58 36 Energy North American gas storage 199 1,141 136 478 452 274 Canadian district energy operation 15 570 13 290 209 73 U.S. district energy operation 43 697 62 537 73 68 Corporate & Other Holding LP and other 631 377 677 810 79 (558 ) Total $ 1,542 $ 13,034 $ 1,402 $ 8,620 $ 2,771 $ 1,783 (1) Attributable to non-controlling interest—Redeemable Partnership Units held by Brookfield, general partner and limited partners. The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Operating Results: Year ended December 31, 2017 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 385 $ 21 $ 29 $ 114 $ 118 Australian regulated terminal operation 301 15 3 35 7 Colombian regulated distribution operation 161 12 38 2 7 Brazilian regulated gas transmission operation 938 349 (160 ) 146 (72 ) Transport U.K. port operation 180 8 21 22 29 Australian port operation 501 (7 ) 28 (3 ) 9 Chilean toll roads 154 — 7 — 8 Peruvian toll roads 103 12 22 2 5 Indian toll roads 57 (2 ) 4 (1 ) 3 Energy North American gas storage operation 149 30 74 18 47 Canadian district energy operation 95 (2 ) 39 — 13 U.S. district energy operation 131 10 40 7 26 Corporate & Other Holding LP and other 22 (3 ) 1 (349 ) (410 ) Total $ 3,177 $ 443 $ 146 $ (7 ) $ (210 ) Year ended December 31, 2016 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income (loss) Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 347 $ 12 $ (14 ) $ 79 $ (55 ) Australian regulated terminal operation 299 15 (5 ) 46 (12 ) Colombian regulated distribution operation 150 10 45 2 10 Transport U.K. port operation 178 11 (37 ) 20 (52 ) Australian port operation 182 (18 ) (24 ) (7 ) (8 ) Chilean toll roads 127 (9 ) 7 (10 ) 8 Brazilian toll roads — 6 38 5 25 Peruvian toll roads 97 (8 ) (7 ) (2 ) (1 ) Indian toll roads 39 (3 ) 1 (3 ) — Energy North American gas storage operation 100 1 — 1 — Canadian district energy operation 79 (1 ) 31 1 11 U.S. district energy operation 111 (6 ) 31 — 20 Corporate & Other Holding LP and other 15 31 1 31 180 Total $ 1,724 $ 41 $ 67 $ 163 $ 126 Year ended December 31, 2015 Attributable to non-controlling interest Attributable to unitholders US$ MILLIONS Revenue Net Income Other Comprehensive Income (loss) Net Income (loss) Other Comprehensive Income (loss) Utilities U.K. regulated distribution operation $ 339 $ 21 $ 25 $ 122 $ 101 Australian regulated terminal operation 330 15 (4 ) 68 (9 ) Colombian regulated distribution operation 152 13 (26 ) 16 (9 ) Transport U.K. port operation 220 7 13 22 18 Chilean toll roads 113 (7 ) (20 ) (15 ) (21 ) Energy North American gas storage operation 20 (8 ) 5 (12 ) 1 Canadian district energy operation 80 — 6 — 2 U.S. district energy operation 114 (6 ) 8 (3 ) 5 Corporate & Other Holding LP and other 21 55 (90 ) 5 (32 ) Total $ 1,389 $ 90 $ (83 ) $ 203 $ 56 The following tables present summarized accounts for non-wholly owned subsidiaries on the Consolidated Statement of Cash Flows: Cash Flow Activities Year ended December 31, 2017 Year ended December 31, 2016 US$ MILLIONS Operating Investing Financing Operating Investing Financing Utilities U.K. regulated distribution operation $ 220 $ (343 ) $ 129 $ 244 $ (487 ) $ 245 Australian regulated terminal operation 96 (9 ) (87 ) 128 (22 ) (106 ) Colombian regulated distribution operation 7 (22 ) 26 17 (18 ) — Brazilian regulated gas transmission operation 819 83 (839 ) — — — Transport U.K. port operation 46 (40 ) (10 ) 33 (24 ) (14 ) Australian port operation 37 (39 ) 12 7 (99 ) 154 Chilean toll roads 56 (5 ) (88 ) 63 (1 ) (99 ) Brazilian toll roads — — — 2 (70 ) 70 Peruvian toll roads 46 (67 ) — 29 25 1 Indian toll roads 30 (7 ) (22 ) (7 ) 28 (10 ) Energy North American gas storage operation 55 (9 ) (76 ) (12 ) 6 46 Canadian district energy operation 26 (82 ) 102 27 (18 ) (13 ) U.S. district energy operation 24 8 (28 ) 26 (33 ) 9 Corporate & Other Holding LP and other (98 ) (5,089 ) 4,721 124 (282 ) 618 Total $ 1,364 $ (5,621 ) $ 3,840 $ 681 $ (995 ) $ 901 Cash Flow Activities Year ended December 31, 2015 US$ MILLIONS Operating Investing Financing Utilities U.K. regulated distribution operation $ 164 $ (242 ) $ 92 Australian regulated terminal operation 103 (37 ) (67 ) New England electricity transmission operation 2 — (2 ) Colombian regulated distribution operation 16 (6 ) (7 ) Transport U.K. port operation 19 (66 ) 61 Australian port operation — — — Chilean toll roads 70 — (38 ) Energy North American gas storage operation (3 ) (1 ) 1 Canadian district energy operation 22 (16 ) (23 ) U.S. district energy operation 21 (13 ) (7 ) Corporate & Other Holding LP and other 92 (650 ) 554 Total $ 506 $ (1,031 ) $ 564

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2017
Income Taxes [Abstract]
Deferred income tax balances	US$ MILLIONS 2017 2016 2015 Deferred income tax arising on income and expenses recognized in other comprehensive income: Revaluation of property, plant and equipment $ (204 ) $ (90 ) $ (130 ) Cash flow hedges 8 8 (15 ) Other (4 ) 7 4 Total income tax expense recognized directly in other comprehensive income $ (200 ) $ (75 ) $ (141 ) The sources of deferred income tax balances and movements are as follows: Recognized in US$ MILLIONS Jan. 1, 2017 Net Income Other Comprehensive Income Other (1) Acquisitions (Dispositions) Dec. 31, 2017 Deferred income tax assets related to non-capital losses and capital losses $ 357 $ (19 ) $ — $ 23 $ — $ 361 Deferred income tax liabilities related to differences in tax and book basis, net (1,895 ) (48 ) (200 ) (71 ) (930 ) (3,144 ) Net deferred income tax liabilities $ (1,538 ) $ (67 ) $ (200 ) $ (48 ) $ (930 ) $ (2,783 ) Recognized in US$ MILLIONS Jan. 1, 2016 Net Income Other Comprehensive Income Other (1) Acquisitions (Dispositions) Dec. 31, 2016 Deferred income tax assets related to non-capital losses and capital losses $ 239 $ 17 $ — $ 4 $ 97 $ 357 Deferred income tax liabilities related to differences in tax and book basis, net (1,542 ) 1 (75 ) 52 (331 ) (1,895 ) Net deferred income tax liabilities $ (1,303 ) $ 18 $ (75 ) $ 56 $ (234 ) $ (1,538 ) (1) Other items relates to foreign exchange as deferred income taxes are calculated based on the functional currency of each operating entity. The sources of deferred income tax balances are as follows: As of December 31 US$ MILLIONS 2017 2016 Deferred income tax assets Tax losses carried forward $ 361 $ 357 Financial instruments and other — 125 $ 361 $ 482 Deferred income tax liabilities Property, plant and equipment and investment properties $ (1,374 ) $ (1,306 ) Intangible assets (1,761 ) (714 ) Financial instruments and other $ (9 ) $ — $ (3,144 ) $ (2,020 ) Net deferred income tax liabilities $ (2,783 ) $ (1,538 ) Reflected in the statement of financial position as follows: Deferred income tax assets $ 66 $ 74 Deferred income tax liabilities (2,849 ) (1,612 ) Net deferred income tax liabilities $ (2,783 ) $ (1,538 )
Components of income tax expense (recovery)	The major components of income tax expense include the following: For the year ended December 31, US$ MILLIONS 2017 2016 2015 Tax expense (recovery) comprises: Current income tax expense $ 106 $ 33 $ 22 Deferred income tax expense (recovery) Origination and reversal of temporary differences 92 (62 ) 4 Changes in tax rates or the imposition of new taxes (41 ) 1 (28 ) Previously unrecognized deferred taxes 16 43 (2 ) Total income tax expense (recovery) $ 173 $ 15 $ (4 ) Net income before income tax expense reconciles to income tax expense (recovery) as follows: Net income before income tax $ 747 $ 543 $ 387 Income tax expense calculated at the domestic rates applicable to profits in the country concerned 304 77 74 Change in substantively enacted tax rates (41 ) 1 (28 ) Earnings from investments in associates and joint ventures (12 ) (34 ) (16 ) Portion of gains subject to different tax rates 2 (54 ) 2 Taxable income attributable to non-controlling interests (65 ) (7 ) (25 ) International operations subject to different tax rates (39 ) (6 ) (8 ) Deferred tax assets not recognized 15 41 4 Permanent differences and other 9 (3 ) (7 ) Income tax expense (recovery) recognized in profit or loss $ 173 $ 15 $ (4 )

PARTNERSHIP CAPITAL (Tables)

PARTNERSHIP CAPITAL (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [abstract]
Disclosure of classes of share capital	Preferred Unitholders’ Capital Preferred Units UNITS MILLIONS 2017 2016 2015 Opening balance 20.0 10.0 — Issued for cash 12.0 10.0 10.0 Ending balance 32.0 20.0 10.0 Preferred Units US$ MILLIONS 2017 2016 2015 Opening balance $ 375 $ 189 $ — Unit issuance 220 186 189 Ending balance $ 595 $ 375 $ 189 Special and Limited Partnership Capital Special General Partner Units Limited Partnership Units Total UNITS MILLIONS 2017 2016 2015 2017 2016 2015 2017 2016 2015 Opening balance 1.6 1.6 1.6 259.4 243.2 225.5 261.0 244.8 227.1 Issued for cash — — — 17.2 16.4 20.2 17.2 16.4 20.2 Repurchased and cancelled — — — — (0.2 ) (2.5 ) — (0.2 ) (2.5 ) Ending balance 1.6 1.6 1.6 276.6 259.4 243.2 278.2 261.0 244.8 Special General Partner Limited Partners Total US$ MILLIONS 2017 2016 2015 2017 2016 2015 2017 2016 2015 Opening balance $ 19 $ 19 $ 19 $ 4,215 $ 3,716 $ 3,201 $ 4,234 $ 3,735 $ 3,220 Unit issuance — — — 692 505 582 692 505 582 Repurchased and cancelled — — — — (6 ) (67 ) — (6 ) (67 ) Ending balance $ 19 $ 19 $ 19 $ 4,907 $ 4,215 $ 3,716 $ 4,926 $ 4,234 $ 3,735 Non-controlling interest—Redeemable Partnership Units held by Brookfield Non-controlling interest— Redeemable Partnership Units held by Brookfield UNITS MILLIONS 2017 2016 2015 Opening balance 108.4 100.3 88.1 Issued for cash 7.4 8.1 12.2 Ending balance 115.8 108.4 100.3 Non-controlling interest— Redeemable Partnership Units held by Brookfield US$ MILLIONS 2017 2016 2015 Opening balance $ 1,778 $ 1,528 $ 1,178 Unit issuance 300 250 350 Ending balance $ 2,078 $ 1,778 $ 1,528

ACCUMULATED OTHER COMPREHENSI66

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [abstract]
Schedule of accumulated other comprehensive income (loss)	(a) Attributable to Limited Partners’ US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 1,042 $ (889 ) $ 99 $ (140 ) $ (9 ) $ (13 ) $ 465 $ 555 Other comprehensive income (loss) 93 (5 ) 117 9 5 (17 ) 156 358 Other items (note 26) (178 ) 3 (1 ) 1 — — (2 ) (177 ) Balance at December 31, 2016 $ 957 $ (891 ) $ 215 $ (130 ) $ (4 ) $ (30 ) $ 619 $ 736 Other comprehensive income (loss) 19 56 (187 ) 104 4 3 129 128 Balance at December 31, 2017 $ 976 $ (835 ) $ 28 $ (26 ) $ — $ (27 ) $ 748 $ 864 (b) Attributable to General Partner US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 7 $ (5 ) $ 1 $ (1 ) $ — $ — $ 2 $ 4 Other comprehensive income (loss) 1 — 2 — — — 1 4 Other items (note 26) (1 ) — — — — — — (1 ) Balance at December 31, 2016 $ 7 $ (5 ) $ 3 $ (1 ) $ — $ — $ 3 $ 7 Other comprehensive income (loss) — (1 ) (2 ) 1 — — 1 (1 ) Balance at December 31, 2017 $ 7 $ (6 ) $ 1 $ — $ — $ — $ 4 $ 6 (c) Attributable to Non-controlling interest—Redeemable Partnership Units held by Brookfield US$ MILLIONS Revaluation Surplus Foreign Currency Translation Net Investment Hedges Cash Flow Hedges Available for sale Unrealized Actuarial Losses Equity accounted investments Accumulated Other Comprehensive Income Balance at December 31, 2015 $ 447 $ (358 ) $ 38 $ (61 ) $ (4 ) $ (2 ) $ 194 $ 254 Other comprehensive income (loss) 38 (4 ) 49 4 2 (7 ) 65 147 Other items (note 26) (68 ) (3 ) 1 (1 ) (1 ) — 2 (70 ) Balance at December 31, 2016 $ 417 $ (365 ) $ 88 $ (58 ) $ (3 ) $ (9 ) $ 261 $ 331 Other comprehensive income (loss) 8 26 (77 ) 44 1 1 53 56 Balance at December 31, 2017 $ 425 $ (339 ) $ 11 $ (14 ) $ (2 ) $ (8 ) $ 314 $ 387

RETIREMENT BENEFIT PLANS (Table

RETIREMENT BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2017
Employee Benefits [Abstract]
Disclosure of defined benefit plans	US$ MILLIONS 2017 2016 Plan assets $ 228 $ 198 Less accrued benefit obligation (328 ) (296 ) Accrued benefit liability $ (100 ) $ (98 )

DERIVATIVE FINANCIAL INSTRUME68

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
Notional amount of derivative positions	Brookfield Infrastructure held the following foreign exchange contracts with notional amounts at December 31, 2017 and 2016 . Notional Amount (U.S. Dollars) Average Exchange Rate US$ MILLIONS 2017 2016 2017 2016 Foreign exchange contracts Australian dollars $ 1,214 $ 2,133 0.74 0.73 British pounds 2,069 1,810 1.30 1.30 European Union euros 491 374 1.17 1.14 Brazilian reais — 144 — 3.37 Canadian dollars 42 27 0.77 0.76 $ 3,816 $ 4,488 The aggregate notional amount of Brookfield Infrastructure’s derivative positions at December 31, 2017 and 2016 were as follows: US$ MILLIONS Note 2017 2016 Foreign exchange contracts (a) $ 3,816 $ 4,488 Interest rates swaps and other (b) 5,013 4,416 $ 8,829 $ 8,904
Disclosure of change in fair values of derivative positions	The following table presents the change in fair values of Brookfield Infrastructure’s derivative positions during the years ended December 31, 2017 and 2016 : US$ MILLIONS Unrealized Gains on Derivative Financial Assets Unrealized Losses on Derivative Financial Liabilities Net Change During 2017 Net Change During 2016 Foreign exchange derivatives $ — $ (305 ) $ (305 ) $ 97 Interest rate derivative 132 (69 ) 63 15 $ 132 $ (374 ) $ (242 ) $ 112
Disclosure of information about terms and conditions of hedging instruments	The following table presents the notional amounts underlying Brookfield Infrastructure’s derivative instruments by term to maturity as at December 31, 2017 and the comparative notional amounts at December 31, 2016 , for both derivatives that are classified as fair value through profit or loss and derivatives that qualify for hedge accounting: 2017 2016 US$ MILLIONS < 1 year 1 to 5 years > 5 years Total Notional Amount Total Notional Amount Fair value through profit or loss Foreign exchange derivatives $ 640 $ 807 $ — $ 1,447 $ 1,351 Interest rate derivatives Interest rate and cross currency interest rate swaps 273 484 59 816 752 Inflation linked swaps — — 170 170 155 $ 913 $ 1,291 $ 229 $ 2,433 $ 2,258 Elected for hedge accounting Foreign exchange derivatives $ 1,788 $ 581 $ — $ 2,369 $ 3,136 Interest rate derivatives Interest rate and cross currency interest rate swaps 99 2,051 1,877 4,027 3,509 $ 1,887 $ 2,632 $ 1,877 $ 6,396 $ 6,645
Disclosure of derivatives elected for hedge accounting	The following table classifies derivatives elected for hedge accounting during the years ended December 31, 2017 and 2016 as either cash flow hedges or net investment hedges. Changes in the fair value of the effective portion of the hedges are recorded in either other comprehensive income or net income, depending on the hedge classification, whereas changes in the fair value of the ineffective portion of the hedge are recorded in net income: 2017 2016 AS AT AND FOR THE YEARS ENDED (MILLIONS) Notional Effective Portion Ineffective Portion Notional Effective Portion Ineffective Portion Cash flow hedges $ 4,027 $ 15 $ — $ 3,509 $ 30 $ 1 Net investment hedges 2,369 (197 ) — 3,136 53 — $ 6,396 $ (182 ) $ — $ 6,645 $ 83 $ 1

FINANCIAL RISK MANAGEMENT (Tabl

FINANCIAL RISK MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Instruments [Abstract]
Disclosure of capital structure	The capital structure of Brookfield Infrastructure consists of debt, offset by cash and cash equivalents, and partnership capital comprised of issued capital and accumulated gains. US$ MILLIONS 2017 2016 Subsidiary and corporate borrowings $ 10,164 $ 8,326 Preferred shares 20 20 Cash and cash equivalents (1) (459 ) (789 ) Net debt 9,725 7,557 Total partnership capital 13,474 9,644 Total capital and net debt $ 23,199 $ 17,201 Net debt to capitalization ratio 42 % 44 % (1) Includes marketable securities.
Disclosure of liquidity management	Brookfield Infrastructure’s corporate liquidity as at December 31 was as follows: US$ MILLIONS (1) 2017 2016 Corporate cash and financial assets $ 205 $ 549 Availability under committed credit facilities 2,475 2,475 Draws on credit facility (789 ) — Commitments under credit facility (106 ) (46 ) Corporate liquidity $ 1,785 $ 2,978 (1) Corporate level only.
Disclosure of maturity analysis for financial liabilities	The following tables detail the contractual maturities for Brookfield Infrastructure’s financial liabilities. The tables reflect the undiscounted cash flows of financial liabilities based on the earliest date on which Brookfield Infrastructure can be required to pay. The tables include both interest and principal cash flows: Less than 1 year 1-2 years 2-5 years 5+ years Total contractual cash flows December 31, 2017 US$ MILLIONS Accounts payable and other liabilities $ 646 $ 45 $ 59 $ 293 $ 1,043 Corporate borrowings 99 — 1,445 557 2,101 Non-recourse borrowings 372 571 2,043 5,101 8,087 Financial liabilities 237 58 930 88 1,313 Interest Expense: Corporate borrowings 49 47 106 25 227 Non-Recourse borrowings 381 348 864 1,343 2,936 Less than 1 year 1-2 years 2-5 years 5+ years Total contractual cash flows December 31, 2016 US$ MILLIONS Accounts payable and other liabilities $ 540 $ 34 $ 26 $ 186 $ 786 Corporate borrowings 295 93 279 335 1,002 Non-recourse borrowings 286 233 1,708 5,109 7,336 Financial liabilities 229 29 49 74 381 Interest Expense: Corporate borrowings 40 29 64 14 147 Non-recourse borrowings 361 342 871 1,450 3,024
Disclosure of sensitivity analysis for interest rate and foreign exchange risk	The sensitivity analyses below reflect Brookfield Infrastructure’s exposure to interest rates for both derivative and non-derivative instruments at the reporting date, assuming that a 10 basis point increase or decrease in rates takes place at the beginning of the financial year and is held constant throughout the reporting period. The sensitivity analyses assume a 10 basis point change to reflect the current methodology employed by Brookfield Infrastructure in assessing interest rate risk. Such parallel shift in the yield curve by 10 basis points would have had the following impact, assuming all other variables were held constant: 2017 2016 2015 US$ MILLIONS 10 bp decrease 10 bp increase 10 bp decrease 10 bp increase 10 bp decrease 10 bp increase Net income (loss) $ — $ — $ 1 $ (1 ) $ 2 $ (2 ) Other comprehensive (loss) income (1 ) 1 (1 ) 1 (2 ) 2 The following tables detail Brookfield Infrastructure’s sensitivity to a 10% increase and decrease in the U.S. dollar against the relevant foreign currencies, with all other variables held constant as at reporting date. 10% is the sensitivity rate used when reporting foreign currency risk internally. The sensitivity analysis is performed as follows: • Outstanding foreign currency denominated monetary items (excluding foreign exchange derivative contracts) are adjusted at period end for a 10% change in foreign currency rates from the rate at which they are translated; • Foreign currency derivative contracts are measured as the change in fair value of the derivative as a result of a 10% change in the spot currency rate; and • The impact on net income results from performing a sensitivity of a 10% change in foreign exchange rates applied to the profit or loss contribution from foreign operations (after considering the impact of foreign exchange derivative contracts). Impact on Net Income 2017 2016 2015 US$ MILLIONS -10% 10% -10% 10% -10% 10% USD/AUD $ (18 ) $ 18 $ (2 ) $ 2 $ 8 $ (8 ) USD/EUR (9 ) 9 (8 ) 8 5 (5 ) USD/GBP (3 ) 3 (6 ) 6 5 (5 ) USD/BRL 21 (21 ) 14 (14 ) — — USD/CLP 1 (1 ) — — 1 (1 ) USD/CAD (1 ) 1 (1 ) 1 1 (1 ) USD/PEN — — — — — — USD/INR — — — — — — Impact on Partnership Capital 2017 2016 2015 US$ MILLIONS -10% 10% -10% 10% -10% 10% USD/AUD $ — $ — $ — $ — $ 24 $ (24 ) USD/EUR — — 35 (35 ) 18 (18 ) USD/GBP — — — — 23 (23 ) USD/CLP 8 (8 ) 10 (10 ) 13 (13 ) USD/COP 7 (7 ) 6 (6 ) 6 (6 ) USD/BRL 334 (334 ) 172 (172 ) 89 (89 ) USD/CAD — — — — 11 (11 ) USD/PEN 12 (12 ) 11 (11 ) — — USD/INR 4 (4 ) 4 (4 ) — —
Disclosure of foreign currency exposure	The tables below set out Brookfield Infrastructure’s currency exposure at December 31, 2017 , 2016 and 2015 : 2017 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP PEN INR NZD Total Assets: Current assets $ 358 $ 276 $ 151 $ 322 $ 85 $ 78 $ — $ 68 $ 100 $ 57 $ 17 $ 1,512 Non-current assets 4,400 5,770 4,431 8,184 1,117 814 836 764 1,356 256 37 27,965 $ 4,758 $ 6,046 $ 4,582 $ 8,506 $ 1,202 $ 892 $ 836 $ 832 $ 1,456 $ 313 $ 54 $ 29,477 Liabilities: Current liabilities $ 641 $ 227 $ 414 $ 73 $ 59 $ 55 $ — $ 26 $ 18 $ 30 $ 21 $ 1,564 Non-current liabilities 3,093 3,983 2,614 2,015 989 443 — 438 673 185 6 14,439 3,734 4,210 3,028 2,088 1,048 498 — 464 691 215 27 16,003 Non-controlling interest—in operating subsidiaries and preferred unitholders 602 417 396 3,082 75 891 — 302 644 60 1 6,470 Non-controlling interest—Redeemable Partnership Units held by Brookfield (50 ) 407 332 959 23 28 240 19 35 11 8 2,012 Net investment $ 472 $ 1,012 $ 826 $ 2,377 $ 56 $ (525 ) $ 596 $ 47 $ 86 $ 27 $ 18 $ 4,992 2016 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP PEN INR NZD Total Assets: Current assets $ 849 $ 214 $ 127 $ 42 $ 102 $ 18 $ — $ 55 $ 127 $ 52 $ 46 $ 1,632 Non-current assets 3,744 5,542 3,739 1,895 1,070 677 718 700 1,260 265 33 19,643 $ 4,593 $ 5,756 $ 3,866 $ 1,937 $ 1,172 $ 695 $ 718 $ 755 $ 1,387 $ 317 $ 79 $ 21,275 Liabilities: Current liabilities $ 833 $ 206 $ 262 $ 23 $ 50 $ 35 $ — $ 27 $ 27 $ 36 $ 16 $ 1,515 Non-current liabilities 1,636 3,764 2,243 — 941 309 — 369 636 186 32 10,116 2,469 3,970 2,505 23 991 344 — 396 663 222 48 11,631 Non-controlling interest—in operating subsidiaries and preferred unitholders 919 370 333 189 89 261 — 294 610 58 23 3,146 Non-controlling interest—Redeemable Partnership Units held by Brookfield 344 405 294 493 26 26 206 19 33 11 3 1,860 Net investment $ 861 $ 1,011 $ 734 $ 1,232 $ 66 $ 64 $ 512 $ 46 $ 81 $ 26 $ 5 $ 4,638 2015 US$ MILLIONS USD AUD GBP BRL CLP CAD EUR COP Total Assets: Current assets $ 234 $ 380 $ 470 $ 6 $ 126 $ 291 $ — $ 46 $ 1,553 Non-current assets 2,485 5,816 3,927 1,020 1,052 636 618 629 16,182 $ 2,719 $ 6,196 $ 4,397 $ 1,026 $ 1,178 $ 927 $ 618 $ 675 $ 17,735 Liabilities: Current liabilities $ 502 $ 103 $ 434 $ — $ 30 $ 122 $ — $ 20 $ 1,210 Non-current liabilities 1,714 3,745 2,312 — 902 334 — 342 9,349 2,216 3,848 2,746 — 932 456 — 362 10,559 Non-controlling interest—in operating subsidiaries and preferred unitholders 377 269 385 141 121 248 — 256 1,797 Non-controlling interest—Redeemable Partnership Units held by Brookfield 36 587 357 249 35 63 175 16 1,518 Net investment $ 90 $ 1,492 $ 909 $ 636 $ 90 $ 160 $ 443 $ 41 $ 3,861

CAPITAL MANAGEMENT (Tables)

CAPITAL MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Capital Management [Abstract]
Schedule of invested capital	We define Invested Capital as partnership capital removing the impact of the following items: non-controlling interest - in operating subsidiaries, retained earnings or deficit, accumulated other comprehensive income and ownership changes. 1. Estimated based on the discounted cash flow models which we utilize in order to value and measure the performance of our operations. US$ MILLIONS 2017 2016 Partnership Capital $ 13,474 $ 9,644 Remove impact of the following items since inception: Non-controlling interest - in operating subsidiaries (5,875 ) (2,771 ) Deficit 1,366 697 Accumulated other comprehensive income (1,257 ) (1,074 ) Ownership changes (109 ) (109 ) Invested Capital $ 7,599 $ 6,387 The following table presents the change in Invested Capital during year ended December 31, 2017 : US$ MILLIONS 2017 2016 Opening balance $ 6,387 $ 5,452 Issuance of preferred units 220 186 Issuance of limited partnership units and redeemable partnership units 992 749 Ending balance $ 7,599 $ 6,387 Weighted Average Invested Capital $ 6,885 $ 5,592

SUPPLEMENTAL CASH FLOW INFORM71

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Cash Flow Statement [Abstract]
Disclosure of interest and income taxes paid	For the Year Ended US$ MILLIONS 2017 2016 2015 Interest paid $ 451 $ 366 $ 332 Income taxes paid $ 132 $ 33 $ 22
Disclosure of changes in non-cash working capital	Details of “Changes in non-cash working capital, net” on the Consolidated Statements of Cash Flows are as follows: For the Year Ended US$ MILLIONS 2017 2016 2015 Accounts receivable $ (31 ) $ 31 $ 27 Prepayments and other 4 3 1 Accounts payable and other 158 11 (110 ) Changes in non-cash working capital, net $ 131 $ 45 $ (82 )

ORGANIZATION AND DESCRIPTION 72

ORGANIZATION AND DESCRIPTION OF THE BUSINESS (Details) shares in Millions	Sep. 14, 2016shares
Corporate Information And Statement Of IFRS Compliance [Abstract]
Stock split conversion ratio	1.5
Additional unit received for each unit held in stock split	0.5
Number of shares issued	115

SUBSIDIARIES (Details)

SUBSIDIARIES (Details) - USD ($) $ in Millions	Apr. 04, 2017	Dec. 31, 2017	Dec. 31, 2016	Aug. 18, 2016	Jul. 19, 2016	Jun. 28, 2016	Mar. 01, 2016
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Ownership interest (%)	28.00%
Consideration transferred	$ 1,568
Australian port operation
Disclosure of subsidiaries [line items]
Consideration transferred				$ 145
Percentage of voting equity interests acquired				27.00%
Indian toll roads
Disclosure of subsidiaries [line items]
Consideration transferred							$ 42
Percentage of voting equity interests acquired							40.00%
Peruvian toll roads
Disclosure of subsidiaries [line items]
Consideration transferred						$ 127
Percentage of voting equity interests acquired						17.00%
North American gas storage operation
Disclosure of subsidiaries [line items]
Consideration transferred					$ 227
Percentage of voting equity interests acquired					40.00%
Australian rail operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		100.00%	100.00%
Australian energy distribution operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		100.00%	100.00%
U.K. regulated distribution
Disclosure of subsidiaries [line items]
Ownership interest (%)		80.00%	80.00%
Voting interest (%)		80.00%	80.00%
Australian regulated terminal
Disclosure of subsidiaries [line items]
Ownership interest (%)		71.00%	71.00%
Voting interest (%)		100.00%	100.00%
Colombian regulated distribution
Disclosure of subsidiaries [line items]
Ownership interest (%)		17.00%	17.00%
Voting interest (%)		100.00%	100.00%
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		28.00%	0.00%
Voting interest (%)		90.00%	0.00%
U.K. port operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		59.00%	59.00%
Voting interest (%)		100.00%	100.00%
Australian port operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		27.00%	27.00%
Voting interest (%)		67.00%	67.00%
Chilean toll roads
Disclosure of subsidiaries [line items]
Ownership interest (%)		51.00%	51.00%
Voting interest (%)		89.00%	89.00%
Indian toll roads
Disclosure of subsidiaries [line items]
Ownership interest (%)		40.00%	40.00%
Voting interest (%)		93.00%	93.00%
Peruvian toll roads
Disclosure of subsidiaries [line items]
Ownership interest (%)		17.00%	17.00%
Voting interest (%)		57.00%	57.00%
North American gas storage - Warwick Gas Storage L.P.
Disclosure of subsidiaries [line items]
Ownership interest (%)		25.00%	25.00%
Voting interest (%)		100.00%	100.00%
Canadian district energy operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		25.00%	25.00%
Voting interest (%)		100.00%	100.00%
U.S. district energy operation
Disclosure of subsidiaries [line items]
Ownership interest (%)		40.00%	40.00%
Voting interest (%)		100.00%	100.00%
North American gas storage operation - Lodi Gas Storage
Disclosure of subsidiaries [line items]
Ownership interest (%)		40.00%	40.00%
Voting interest (%)		100.00%	100.00%
North American gas storage operation - Rockpoint Gas Storage Partners L.P.
Disclosure of subsidiaries [line items]
Ownership interest (%)		40.00%	40.00%
Voting interest (%)		100.00%	100.00%
Holding LP and other
Disclosure of subsidiaries [line items]
Ownership interest (%)		70.00%	70.00%
Voting interest (%)		100.00%	100.00%

SIGNIFICANT ACCOUNTING POLICI74

SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2017
Customer order backlog
Disclosure of detailed information about intangible assets [line items]
Useful life of intangible asset	15 years
Australian regulated terminal
Disclosure of detailed information about intangible assets [line items]
Remaining amortisation period of intangible asset	83 years
Chilean toll roads
Disclosure of detailed information about intangible assets [line items]
Remaining amortisation period of intangible asset	16 years
Indian toll roads
Disclosure of detailed information about intangible assets [line items]
Remaining amortisation period of intangible asset	6 years
Peruvian toll roads
Disclosure of detailed information about intangible assets [line items]
Remaining amortisation period of intangible asset	25 years
Buildings | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	70 years
Transmission stations, towers and related fixtures | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	40 years
Leasehold improvements | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	50 years
Plant and equipment | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	40 years
Network systems | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	60 years
Track | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	40 years
District energy systems | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	50 years
Gas storage assets | Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	50 years

SEGMENT INFORMATION (Operating

SEGMENT INFORMATION (Operating Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of operating segments [line items]
Revenues	$ 3,535	$ 2,115	$ 1,855
Costs attributed to revenues	(1,509)	(1,063)	(798)
General and administrative costs	(239)	(166)	(134)
Other income (expense)	(61)	95	36
Interest expense	(428)	(392)	(367)
Depreciation and amortization	(671)	(447)	(375)
Deferred taxes	(67)	18	26
Mark-to-market on hedging items and other	(82)	133	79
Share of earnings from associates	118	248	69
Net income attributable to non-controlling interest and preferred unitholders	(471)	(54)	(90)
Net income (loss) attributable to partnership	125	487	301
Reportable segments
Disclosure of operating segments [line items]
Revenues	3,301	2,590	2,313
Costs attributed to revenues	(1,498)	(1,102)	(1,002)
General and administrative costs	(239)	(166)	(134)
Adjusted EBITDA	1,564	1,322	1,177
Other income (expense)	40	78	27
Interest expense	(434)	(456)	(396)
Funds From Operations	1,170	944	808
Depreciation and amortization	(726)	(609)	(506)
Deferred taxes	(7)	5	53
Mark-to-market on hedging items and other	(312)	147	(54)
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	125	487	301
Reportable segments | Utilities
Disclosure of operating segments [line items]
Revenues	988	684	698
Costs attributed to revenues	(250)	(160)	(174)
General and administrative costs	0	0	0
Adjusted EBITDA	738	524	524
Other income (expense)	(14)	5	5
Interest expense	(114)	(130)	(142)
Funds From Operations	610	399	387
Depreciation and amortization	(186)	(154)	(153)
Deferred taxes	(52)	5	(8)
Mark-to-market on hedging items and other	(59)	(88)	(16)
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	313	162	210
Reportable segments | Transport
Disclosure of operating segments [line items]
Revenues	1,589	1,247	1,143
Costs attributed to revenues	(895)	(650)	(588)
General and administrative costs	0	0	0
Adjusted EBITDA	694	597	555
Other income (expense)	(4)	(17)	(15)
Interest expense	(158)	(157)	(142)
Funds From Operations	532	423	398
Depreciation and amortization	(312)	(253)	(217)
Deferred taxes	(1)	26	21
Mark-to-market on hedging items and other	(80)	10	(67)
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	139	206	135
Reportable segments | Energy
Disclosure of operating segments [line items]
Revenues	559	496	349
Costs attributed to revenues	(278)	(220)	(183)
General and administrative costs	0	0	0
Adjusted EBITDA	281	276	166
Other income (expense)	15	8	3
Interest expense	(87)	(109)	(79)
Funds From Operations	209	175	90
Depreciation and amortization	(151)	(128)	(90)
Deferred taxes	11	(38)	14
Mark-to-market on hedging items and other	(37)	81	(14)
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	32	90	0
Reportable segments | Comm. Infrastructure
Disclosure of operating segments [line items]
Revenues	165	163	123
Costs attributed to revenues	(75)	(72)	(57)
General and administrative costs	0	0	0
Adjusted EBITDA	90	91	66
Other income (expense)	(2)	(2)	0
Interest expense	(12)	(12)	(6)
Funds From Operations	76	77	60
Depreciation and amortization	(77)	(74)	(46)
Deferred taxes	21	29	14
Mark-to-market on hedging items and other	(9)	(5)	(13)
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	11	27	15
Reportable segments | Corporate
Disclosure of operating segments [line items]
Revenues	0	0	0
Costs attributed to revenues	0	0	0
General and administrative costs	(239)	(166)	(134)
Adjusted EBITDA	(239)	(166)	(134)
Other income (expense)	45	84	34
Interest expense	(63)	(48)	(27)
Funds From Operations	(257)	(130)	(127)
Depreciation and amortization	0	0	0
Deferred taxes	14	(17)	12
Mark-to-market on hedging items and other	(127)	149	56
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	(370)	2	(59)
Contribution from investments in associates
Disclosure of operating segments [line items]
Revenues	(1,624)	(1,311)	(1,044)
Costs attributed to revenues	861	651	546
General and administrative costs	0	0	0
Adjusted EBITDA	(763)	(660)	(498)
Other income (expense)	7	16	13
Interest expense	172	190	144
Funds From Operations	(584)	(454)	(341)
Depreciation and amortization	382	328	246
Deferred taxes	(22)	9	(41)
Mark-to-market on hedging items and other	106	(131)	67
Share of earnings from associates	118	248	69
Net income attributable to non-controlling interest and preferred unitholders	0	0	0
Net income (loss) attributable to partnership	0	0	0
Attributable to non- controlling interest
Disclosure of operating segments [line items]
Revenues	1,858	836	586
Costs attributed to revenues	(872)	(612)	(342)
General and administrative costs	0	0	0
Adjusted EBITDA	986	224	244
Other income (expense)	(108)	1	(4)
Interest expense	(166)	(126)	(115)
Funds From Operations	712	99	125
Depreciation and amortization	(327)	(166)	(115)
Deferred taxes	(38)	4	14
Mark-to-market on hedging items and other	124	117	66
Share of earnings from associates	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	(471)	(54)	(90)
Net income (loss) attributable to partnership	$ 0	$ 0	$ 0

SEGMENT INFORMATION (Assets) (D

SEGMENT INFORMATION (Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of operating segments [line items]
Assets	$ 29,477	$ 21,275	$ 17,735
Reportable segments
Disclosure of operating segments [line items]
Assets	16,632	14,220
Reportable segments | Utilities
Disclosure of operating segments [line items]
Assets	6,542	4,605
Reportable segments | Transport
Disclosure of operating segments [line items]
Assets	6,990	6,160
Reportable segments | Energy
Disclosure of operating segments [line items]
Assets	3,134	3,032
Reportable segments | Comm. Infrastructure
Disclosure of operating segments [line items]
Assets	1,049	933
Reportable segments | Corporate
Disclosure of operating segments [line items]
Assets	(1,083)	(510)
Contribution from investments in associates
Disclosure of operating segments [line items]
Assets	(3,134)	(2,996)
Attributable to non- controlling interest
Disclosure of operating segments [line items]
Assets	11,668	6,496
Working capital adjustment and other
Disclosure of operating segments [line items]
Assets	$ 4,311	$ 3,555

SEGMENT INFORMATION (Geographic

SEGMENT INFORMATION (Geographic Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)customer	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Disclosure of geographical areas [line items]
Revenues	$ 3,535	$ 2,115	$ 1,855
Non-current Assets	27,965	19,643	16,182
Partnership's Revenue | Customer Concentration Risk
Disclosure of geographical areas [line items]
Revenues	$ 938	0
Number of customers | customer	1
Australia
Disclosure of geographical areas [line items]
Revenues	$ 1,093	793	699
Non-current Assets	5,770	5,542
Brazil
Disclosure of geographical areas [line items]
Revenues	938	0	0
Non-current Assets	8,184	1,895
United Kingdom
Disclosure of geographical areas [line items]
Revenues	565	566	635
Non-current Assets	4,431	3,739
Colombia
Disclosure of geographical areas [line items]
Revenues	161	150	152
Non-current Assets	764	700
Canada
Disclosure of geographical areas [line items]
Revenues	193	163	118
Non-current Assets	1,468	1,252
Chile
Disclosure of geographical areas [line items]
Revenues	153	127	113
Non-current Assets	2,045	1,748
Europe
Disclosure of geographical areas [line items]
Non-current Assets	836	718
United States of America
Disclosure of geographical areas [line items]
Revenues	183	154	138
Non-current Assets	2,818	2,470
India
Disclosure of geographical areas [line items]
Revenues	57	39	0
Non-current Assets	256	265
Peru
Disclosure of geographical areas [line items]
Revenues	103	97	0
Non-current Assets	1,356	1,281
New Zealand
Disclosure of geographical areas [line items]
Revenues	89	26	$ 0
Non-current Assets	$ 37	$ 33

ACQUISITION OF BUSINESSES - Add

ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)	Apr. 04, 2017	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Aug. 18, 2016	Jul. 19, 2016	Jun. 28, 2016	Mar. 01, 2016
Disclosure of detailed information about business combination [line items]
Increase through business combinations, deferred tax liability				$ 930,000,000	$ 234,000,000
Goodwill				1,301,000,000	502,000,000
Revenues				3,535,000,000	2,115,000,000		$ 1,855,000,000
Net income (loss)				574,000,000	528,000,000	[1]	$ 391,000,000	[1]
Deferred income tax liability				2,849,000,000	1,612,000,000
Brazilian regulated gas transmission operation
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	28.00%
Consideration transferred	$ 1,568,000,000
Cash	1,306,000,000
Deferred consideration	$ 262,000,000
Period of payable from close of transaction	5 years
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination				8,000,000
Increase through business combinations, deferred tax liability	$ 893,000,000
Goodwill	804,000,000
Revenues				938,000,000
Net income (loss)				495,000,000
Brazilian regulated gas transmission operation | Consortium
Disclosure of detailed information about business combination [line items]
Consideration transferred	5,100,000,000
Cash	4,200,000,000
Deferred consideration	$ 900,000,000
Aggregated individually immaterial business combinations
Disclosure of detailed information about business combination [line items]
Consideration transferred				27,000,000
Cash				9,000,000
Goodwill				11,000,000
Revenues				24,000,000
Net income (loss)				4,000,000
Liabilities incurred				$ 18,000,000
Australian port operation
Disclosure of detailed information about business combination [line items]
Consideration transferred									$ 145,000,000
Cash									13,000,000
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination					17,000,000
Goodwill									199,000,000
Goodwill not deductible tax purposes									$ 0
Ownership interest			20.00%
Other income		$ 123,000,000
Reclassification adjustments on available-for-sale financial assets, net of tax		44,000,000
Reclassification adjustments on exchange differences on translation, net of tax		$ 79,000,000
Percentage of voting equity interests acquired									27.00%
Common shares of Asciano Limited									$ 132,000,000
Discount rate				15.00%
Terminal value multiple				8.9
Discrete cash flow period				10 years
Australian port operation | Brookfield Consortium
Disclosure of detailed information about business combination [line items]
Cash									63,000,000
Common shares of Asciano Limited									$ 442,000,000
North American gas storage operation
Disclosure of detailed information about business combination [line items]
Consideration transferred										$ 227,000,000
Business combinations, Pre-existing interest, Senior notes										141,000,000
Cash										67,000,000
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination					11,000,000
Goodwill										82,000,000
Goodwill not deductible tax purposes										$ 0
Percentage of voting equity interests acquired										40.00%
Deferred income tax liability										$ 82,000,000
North American gas storage operation | Working Capital Credit Facility
Disclosure of detailed information about business combination [line items]
Current borrowings										$ 19,000,000
Peruvian toll roads
Disclosure of detailed information about business combination [line items]
Consideration transferred											$ 127,000,000
Cash											118,000,000
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination					1,000,000
Goodwill											139,000,000
Goodwill not deductible tax purposes											$ 0
Percentage of voting equity interests acquired											17.00%
Liabilities incurred					9,000,000						$ 9,000,000
Deferred income tax liability											139,000,000
Peruvian toll roads | Brookfield Sponsored Infrastructure Fund
Disclosure of detailed information about business combination [line items]
Cash											400,000,000
Liabilities incurred											$ 30,000,000
Indian toll roads
Disclosure of detailed information about business combination [line items]
Consideration transferred												$ 42,000,000
Cash												$ 42,000,000
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination					$ 2,000,000
Percentage of voting equity interests acquired												40.00%
Deferred income tax assets												$ 10,000,000
Brazilian Regulated Gas Transmission Operation and other insignificant transactions
Disclosure of detailed information about business combination [line items]
Pro forma revenue				$ 3,911,000,000
Pro forma net income				$ 751,000,000
[1]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

ACQUISITION OF BUSINESSES - Pur

ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details)	Jul. 19, 2016USD ($)	Jun. 28, 2016USD ($)payment	Dec. 31, 2016USD ($)	Jul. 18, 2016USD ($)	Dec. 31, 2017USD ($)	Apr. 04, 2017USD ($)	Aug. 18, 2016USD ($)	Mar. 01, 2016USD ($)
Fair value of assets and liabilities acquired
Goodwill			$ 502,000,000		$ 1,301,000,000
Restricted cash and cash equivalents			84,000,000		33,000,000
Brazilian regulated gas transmission operation
Consideration transferred
Cash						$ 1,306,000,000
Deferred consideration, acquisition-date fair value						262,000,000
Total consideration						1,568,000,000
Fair value of assets and liabilities acquired
Cash and cash equivalents						89,000,000
Accounts receivable and other						317,000,000
Intangible assets						5,515,000,000
Goodwill						804,000,000
Accounts payable and other						(202,000,000)
Deferred income tax and other liabilities						(946,000,000)
Net assets acquired before non-controlling interest						5,577,000,000
Non-controlling interest						(4,009,000,000)
Net assets acquired						$ 1,568,000,000
Deferred consideration, interest accrual						3.35%
Aggregated individually immaterial business combinations
Consideration transferred
Cash					9,000,000
Consideration payable					18,000,000
Total consideration					27,000,000
Fair value of assets and liabilities acquired
Accounts receivable and other					28,000,000
Property, plant and equipment					100,000,000
Goodwill					11,000,000
Deferred income tax and other liabilities					(31,000,000)
Non-recourse borrowings					(30,000,000)
Net assets acquired before non-controlling interest					78,000,000
Non-controlling interest					(51,000,000)
Net assets acquired					$ 27,000,000
Australian port operation
Consideration transferred
Cash							$ 13,000,000
Common shares of Asciano Limited							132,000,000
Total consideration							145,000,000
Fair value of assets and liabilities acquired
Cash and cash equivalents							12,000,000
Accounts receivable and other							233,000,000
Assets classified as held for sale							115,000,000
Property, plant and equipment							225,000,000
Intangible assets							69,000,000
Goodwill							199,000,000
Liabilities directly associated with assets classified as held for sale							(58,000,000)
Deferred income tax and other liabilities							(109,000,000)
Non-recourse borrowings							(181,000,000)
Net assets acquired before non-controlling interest							505,000,000
Non-controlling interest							(360,000,000)
Net assets acquired							$ 145,000,000
Gain (loss) on disposition of business			0
North American gas storage operation
Consideration transferred
Cash	$ 67,000,000
Senior notes	141,000,000
Working capital credit facility	19,000,000
Total consideration	227,000,000
Fair value of assets and liabilities acquired
Cash and cash equivalents	15,000,000
Accounts receivable and other	99,000,000
Inventory	39,000,000
Property, plant and equipment	825,000,000
Goodwill	82,000,000
Deferred income tax and other liabilities	(148,000,000)
Non-recourse borrowings	(337,000,000)
Net assets acquired before non-controlling interest	575,000,000
Non-controlling interest	(348,000,000)
Net assets acquired	227,000,000
North American gas storage operation | Credit facility
Consideration transferred
Senior notes	117,000,000
Fair value of assets and liabilities acquired
Notes and debentures issued	104,000,000
Other operating income (expense)	24,000,000			$ 13,000,000
North American gas storage operation | Brookfield Sponsored Partnership
Consideration transferred
Cash	170,000,000
North American gas storage operation | Brookfield Sponsored Partnership | Senior notes
Consideration transferred
Consideration payable	357,000,000
North American gas storage operation | Brookfield Sponsored Partnership | Credit facility
Consideration transferred
Consideration payable	$ 48,000,000
Peruvian toll roads
Consideration transferred
Cash		$ 118,000,000
Consideration payable		9,000,000	$ 9,000,000
Total consideration		127,000,000
Fair value of assets and liabilities acquired
Cash and cash equivalents		115,000,000
Accounts receivable and other		121,000,000
Property, plant and equipment		6,000,000
Intangible assets		973,000,000
Goodwill		139,000,000
Deferred income tax and other liabilities		(160,000,000)
Non-recourse borrowings		(441,000,000)
Net assets acquired before non-controlling interest		753,000,000
Non-controlling interest		(626,000,000)
Net assets acquired		$ 127,000,000
Purchase price number of payments | payment		4
Duration of service concession agreement		30 years
Restricted cash and cash equivalents		$ 114,000,000
Indian toll roads
Consideration transferred
Cash								$ 42,000,000
Total consideration								42,000,000
Fair value of assets and liabilities acquired
Accounts receivable and other								38,000,000
Property, plant and equipment								7,000,000
Financial assets								142,000,000
Intangible assets								147,000,000
Accounts payable and other								(38,000,000)
Non-recourse borrowings								(202,000,000)
Deferred income tax assets								10,000,000
Net assets acquired before non-controlling interest								104,000,000
Non-controlling interest								(62,000,000)
Net assets acquired								$ 42,000,000

FAIR VALUE OF FINANCIAL INSTR80

FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	$ 1,313	$ 381
Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	750	908
Financial liabilities (current and non-current)	440	381
Cash flow hedges | Financial assets at fair value through other comprehensive income, category
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Gains (losses) on hedging instrument, fair value hedges	50	(14)	$ (41)
Derivative financial assets	447	464
Hedges of net investment in foreign operations | Financial assets at fair value through other comprehensive income, category
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Gains (losses) on hedging instrument, fair value hedges	(202)	70	(131)
Derivative financial assets		73
Net foreign exchange loss	64
Net foreign exchange gain		$ 99	$ 220
Derivative financial liabilities	$ 129

FAIR VALUE OF FINANCIAL INSTR81

FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [line items]
Financial assets	$ 2,134	$ 2,412
Disclosure of financial liabilities [line items]
Financial liabilities	12,361	9,439
FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	440	381
Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	11,921	9,058
FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	608	893
Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	142	15
Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	1,384	1,504
Corporate borrowings
Disclosure of financial liabilities [line items]
Financial liabilities	2,101	1,002
Corporate borrowings | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Corporate borrowings | Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Corporate borrowings | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	2,101	1,002
Non-recourse borrowings (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities	8,063	7,324
Non-recourse borrowings (current and non-current) | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Non-recourse borrowings (current and non-current) | Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Non-recourse borrowings (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	8,063	7,324
Accounts payable and other
Disclosure of financial liabilities [line items]
Financial liabilities	864	712
Accounts payable and other | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Accounts payable and other | Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Accounts payable and other | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	864	712
Preferred shares
Disclosure of financial liabilities [line items]
Financial liabilities	20	20
Preferred shares | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Preferred shares | Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Preferred shares | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	20	20
Financial liabilities (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities	1,313	381
Financial liabilities (current and non-current) | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	440	381
Financial liabilities (current and non-current) | Available for sale securities (Fair Value through OCI)
Disclosure of financial liabilities [line items]
Financial liabilities	0	0
Financial liabilities (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial liabilities [line items]
Financial liabilities	873	0
Cash and cash equivalents
Disclosure of financial assets [line items]
Financial assets	374	786
Cash and cash equivalents | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	0	0
Cash and cash equivalents | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	0	0
Cash and cash equivalents | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	374	786
Accounts receivable and other
Disclosure of financial assets [line items]
Financial assets	838	485
Accounts receivable and other | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	0	0
Accounts receivable and other | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	0	0
Accounts receivable and other | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	838	485
Financial assets (current and non-current)
Disclosure of financial assets [line items]
Financial assets	837	1,138
Financial assets (current and non-current) | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	608	893
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	57	12
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	172	233
Marketable securities
Disclosure of financial assets [line items]
Financial assets	85	3
Marketable securities | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	0	0
Marketable securities | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	85	3
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTR82

FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Preferred shares	$ 20	$ 20
Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial instruments designated as hedging instruments, at fair value	464	722
Financial liabilities (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial instruments designated as hedging instruments, at fair value	$ 146	$ 185

FAIR VALUE OF FINANCIAL INSTR83

FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [line items]
Financial assets, Carrying	$ 2,134	$ 2,412
Financial assets, Fair Value	2,134	2,412
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	12,361	9,439
Financial liabilities, Fair Value	12,702	9,614
Corporate borrowings
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	2,101	1,002
Financial liabilities, Fair Value	2,113	1,023
Non-recourse borrowings
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	8,063	7,324
Financial liabilities, Fair Value	8,392	7,478
Accounts payable and other (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	864	712
Financial liabilities, Fair Value	864	712
Preferred shares
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	20	20
Financial liabilities, Fair Value	20	20
Financial liabilities (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	1,313	381
Financial liabilities, Fair Value	1,313	381
Cash and cash equivalents
Disclosure of financial assets [line items]
Financial assets, Carrying	374	786
Financial assets, Fair Value	374	786
Accounts receivable and other
Disclosure of financial assets [line items]
Financial assets, Carrying	838	485
Financial assets, Fair Value	838	485
Financial assets (current and non-current)
Disclosure of financial assets [line items]
Financial assets, Carrying	837	1,138
Financial assets, Fair Value	837	1,138
Marketable securities
Disclosure of financial assets [line items]
Financial assets, Carrying	85	3
Financial assets, Fair Value	$ 85	$ 3

FAIR VALUE OF FINANCIAL INSTR84

FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques and Significant Inputs (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	$ 1,313	$ 381
Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	750	908
Financial liabilities (current and non-current)	440	381
Recurring fair value measurement | Level 1
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	0	0
Recurring fair value measurement | Level 2
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	351	335
Recurring fair value measurement | Level 3
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	89	46
Recurring fair value measurement | Foreign currency forward contracts | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	196	48
Recurring fair value measurement | Interest rate swaps & other | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	155	287
Recurring fair value measurement | Other contracts | Level 3 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	89	46
Recurring fair value measurement | Marketable securities | Level 1
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	85	3
Recurring fair value measurement | Marketable securities | Level 1 | Quoted bid prices
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	85	3
Recurring fair value measurement | Marketable securities | Level 2
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Marketable securities | Level 3
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Foreign currency forward contracts | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	236	210
Recurring fair value measurement | Interest rate swaps & other | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	381	653
Recurring fair value measurement | Other contracts | Level 3 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 48	$ 42

FAIR VALUE OF FINANCIAL INSTR85

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	$ 1,313	$ 381
Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	750	908
Financial liabilities (current and non-current)	440	381
Recurring fair value measurement | Level 1
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	0	0
Recurring fair value measurement | Level 1 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	85	3
Recurring fair value measurement | Level 1 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Level 2
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	351	335
Recurring fair value measurement | Level 2 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Level 2 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	617	863
Recurring fair value measurement | Level 3
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	89	46
Recurring fair value measurement | Level 3 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Level 3 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 48	$ 42

CASH AND CASH EQUIVALENTS (Deta

CASH AND CASH EQUIVALENTS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents [abstract]
Cash	$ 258	$ 652
Restricted cash	33	84
Cash equivalents	83	50
Total cash and cash equivalents	$ 374	$ 786	$ 199	$ 189

FINANCIAL ASSETS (Details)

FINANCIAL ASSETS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current:
Foreign currency forward contracts	$ 10	$ 132
Loans and receivables	43	73
Marketable securities	85	3
Other	54	33
Total current	192	241
Non-current:
Cross currency interest rate swaps	243	589
Loans and receivables	210	172
Foreign currency forward contracts	226	78
Other	51	61
Total non-current	$ 730	$ 900

ACCOUNTS RECEIVABLE AND OTHER88

ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current:
Accounts receivable	$ 738	$ 395
Prepayments & other assets	100	109
Total current	838	504
Non-current:
Tax recovery receivables	52	55
Other assets	221	110
Total non-current	$ 273	$ 165

INVENTORY (Details)

INVENTORY (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Natural gas inventory	$ 84,000,000	$ 82,000,000
Raw materials and consumables	24,000,000	19,000,000
Carrying amount of inventories	108,000,000	101,000,000
Cost of inventories recognised as expense during period	418,000,000	154,000,000	$ 0
Inventory impairment	$ 0	$ 0	$ 0

INVESTMENT IN ASSOCIATES AND 90

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) - USD ($)	Dec. 31, 2017	Aug. 31, 2017	May 31, 2017	Aug. 31, 2016	Apr. 30, 2016	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Cash payment for increase in investment interest							$ 620,000,000	$ 887,000,000	$ 681,000,000
Share of earnings from investments in associates and joint ventures							118,000,000	248,000,000	$ 69,000,000
Acquisitions							$ 620,000,000	1,108,000,000
Brazilian toll roads
Disclosure Of Associates And Joint Ventures [Line Items]
Gain (loss) on investment		$ 0
Proportion of ownership interest in subsidiary							8.00%
Decrease in investments in subsidiaries, joint ventures and associates						$ 177,000,000
Cash payment for increase in investment interest							$ 349,000,000
Ownership Interest	45.00%
Transport and Energy Operations
Disclosure Of Associates And Joint Ventures [Line Items]
Share of earnings from investments in associates and joint ventures								$ 195,000,000
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisitions			$ 200,000,000		$ 312,000,000
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership Interest				13.00%
Acquisitions				$ 202,000,000
Voting Interest				50.00%

INVESTMENT IN ASSOCIATES AND 91

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Ownership and Voting Interest (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Investments accounted for using equity method	$ 5,572	$ 4,727	$ 2,973
Brazillian toll road
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	45.00%	49.00%
Investments accounted for using equity method	$ 1,715	$ 1,505
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	50.00%	50.00%
Investments accounted for using equity method	$ 1,013	$ 806
Chilean electricity transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	28.00%	28.00%
Investments accounted for using equity method	$ 930	$ 699
European telecommunications infrastructure operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	21.00%	21.00%
Investments accounted for using equity method	$ 614	$ 536
Brazilian rail business
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	11.00%	11.00%
Investments accounted for using equity method	$ 436	$ 376
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	13.00%	13.00%
Investments accounted for using equity method	$ 191	$ 181
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Investments accounted for using equity method	$ 673	$ 624
Other | Bottom of range
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	11.00%	11.00%
Other | Top of range
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	50.00%	50.00%

INVESTMENT IN ASSOCIATES AND 92

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in associates and joint ventures
Balance at beginning of year	$ 4,727	$ 2,973
Share of earnings for the year	118	248	$ 69
Foreign currency translation and other	167	219
Share of other comprehensive income	183	225
Distributions	(66)	(46)
Disposition of interest	(177)	0
Acquisitions	620	1,108
Balance at end of year	$ 5,572	$ 4,727	$ 2,973

INVESTMENT IN ASSOCIATES AND 93

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	$ 1,512	$ 1,632	$ 1,553
Non-Current Assets	27,965	19,643	16,182
Total assets	29,477	21,275	17,735
Current Liabilities	1,564	1,515	1,210
Non-Current Liabilities	14,439	10,116	9,349
Total liabilities	16,003	11,631	$ 10,559
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	2,822	1,925
Non-Current Assets	37,553	33,509
Total assets	40,375	35,434
Current Liabilities	2,887	4,016
Non-Current Liabilities	17,688	15,053
Total liabilities	20,575	19,069
Total Net Assets	19,800	16,365
Attributable to Other Ownership Interests	14,228	11,638
Attributable to Partnership's Share	5,572	4,727
Brazilian toll roads
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	304	263
Non-Current Assets	5,769	4,977
Total assets	6,073	5,240
Current Liabilities	602	823
Non-Current Liabilities	2,102	1,665
Total liabilities	2,704	2,488
Total Net Assets	3,369	2,752
Attributable to Other Ownership Interests	1,654	1,247
Attributable to Partnership's Share	1,715	1,505
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	139	122
Non-Current Assets	4,741	5,767
Total assets	4,880	5,889
Current Liabilities	139	1,353
Non-Current Liabilities	2,716	2,925
Total liabilities	2,855	4,278
Total Net Assets	2,025	1,611
Attributable to Other Ownership Interests	1,012	805
Attributable to Partnership's Share	1,013	806
Chilean electricity transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	280	221
Non-Current Assets	7,122	5,519
Total assets	7,402	5,740
Current Liabilities	181	142
Non-Current Liabilities	3,874	3,234
Total liabilities	4,055	3,376
Total Net Assets	3,347	2,364
Attributable to Other Ownership Interests	2,417	1,665
Attributable to Partnership's Share	930	699
European telecommunications infrastructure operation
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	464	328
Non-Current Assets	6,281	5,437
Total assets	6,745	5,765
Current Liabilities	561	443
Non-Current Liabilities	2,968	2,528
Total liabilities	3,529	2,971
Total Net Assets	3,216	2,794
Attributable to Other Ownership Interests	2,602	2,258
Attributable to Partnership's Share	614	536
Brazilian rail business
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	743	460
Non-Current Assets	6,131	5,265
Total assets	6,874	5,725
Current Liabilities	515	674
Non-Current Liabilities	2,405	1,645
Total liabilities	2,920	2,319
Total Net Assets	3,954	3,406
Attributable to Other Ownership Interests	3,518	3,030
Attributable to Partnership's Share	436	376
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	198	171
Non-Current Assets	2,281	2,166
Total assets	2,479	2,337
Current Liabilities	24	66
Non-Current Liabilities	1,332	1,229
Total liabilities	1,356	1,295
Total Net Assets	1,123	1,042
Attributable to Other Ownership Interests	932	861
Attributable to Partnership's Share	191	181
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Current Assets	694	360
Non-Current Assets	5,228	4,378
Total assets	5,922	4,738
Current Liabilities	865	515
Non-Current Liabilities	2,291	1,827
Total liabilities	3,156	2,342
Total Net Assets	2,766	2,396
Attributable to Other Ownership Interests	2,093	1,772
Attributable to Partnership's Share	$ 673	$ 624

INVESTMENT IN ASSOCIATES AND 94

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Income Statement Impact of Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	$ 3,535	$ 2,115		$ 1,855
Net income	574	528	[1]	391	[1]
OCI	323	576		(202)
Comprehensive income	897	1,104		189
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	6,469	4,818		4,312
Net income	378	570		326
OCI	1,750	2,155		(1,647)
Comprehensive income	2,128	2,725		(1,321)
Attributable to Other Ownership Interests	1,665	2,033		(977)
Attributable to Partnership's Share	463	692		(344)
Brazilian toll roads
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	928	766		758
Net income	95	185		(12)
OCI	(39)	382		(1,118)
Comprehensive income	56	567		(1,130)
Attributable to Other Ownership Interests	19	275		(778)
Attributable to Partnership's Share	37	292		(352)
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	681	573		522
Net income	15	133		(29)
OCI	(1)	5		0
Comprehensive income	14	138		(29)
Attributable to Other Ownership Interests	7	69		(19)
Attributable to Partnership's Share	7	69		(10)
Chilean electricity transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	441	433		432
Net income	37	38		75
OCI	806	217		(145)
Comprehensive income	843	255		(70)
Attributable to Other Ownership Interests	609	184		(51)
Attributable to Partnership's Share	234	71		(19)
European telecommunications infrastructure operation
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	783	767		579
Net income	58	121		62
OCI	435	376		72
Comprehensive income	493	497		134
Attributable to Other Ownership Interests	409	393		104
Attributable to Partnership's Share	84	104		30
Brazilian rail business
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	1,409	1,024		1,074
Net income	56	70		136
OCI	490	976		(668)
Comprehensive income	546	1,046		(532)
Attributable to Other Ownership Interests	486	931		(474)
Attributable to Partnership's Share	60	115		(58)
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	418	164
Net income	19	(31)
OCI	78	(81)
Comprehensive income	97	(112)
Attributable to Other Ownership Interests	80	(97)
Attributable to Partnership's Share	17	(15)
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	1,809	1,091		947
Net income	98	54		94
OCI	(19)	280		212
Comprehensive income	79	334		306
Attributable to Other Ownership Interests	55	278		241
Attributable to Partnership's Share	$ 24	$ 56		$ 65
[1]	Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

INVESTMENT IN ASSOCIATES AND 95

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Cash Flows Impact of Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	$ 1,481	$ 753	$ 632
Cash used by investing activities	(5,721)	(1,058)	(2,346)
Cash from financing activities	3,814	899	1,764
Change during the year	(426)	594	50
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	2,033	1,504	1,282
Cash used by investing activities	(2,883)	(2,591)	(1,932)
Cash from financing activities	1,485	880	405
Change during the year	635	(207)	(245)
Other Ownership Interests	519	(177)	(163)
Partnership's Share	116	(30)	(82)
Brazilian toll roads
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	345	249	194
Cash used by investing activities	(1,046)	(491)	(534)
Cash from financing activities	800	212	59
Change during the year	99	(30)	(281)
Other Ownership Interests	57	(19)	(194)
Partnership's Share	42	(11)	(87)
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	258	163	98
Cash used by investing activities	(169)	(170)	(157)
Cash from financing activities	(79)	2	10
Change during the year	10	(5)	(49)
Other Ownership Interests	5	(2)	(32)
Partnership's Share	5	(3)	(17)
Chilean electricity transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	256	273	274
Cash used by investing activities	(240)	(207)	(122)
Cash from financing activities	14	(27)	(197)
Change during the year	30	39	(45)
Other Ownership Interests	22	28	(32)
Partnership's Share	8	11	(13)
European telecommunications infrastructure operation
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	338	325	253
Cash used by investing activities	(226)	(323)	(101)
Cash from financing activities	(58)	(83)	(19)
Change during the year	54	(81)	133
Other Ownership Interests	43	(64)	106
Partnership's Share	11	(17)	27
Brazilian rail business
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	472	337	309
Cash used by investing activities	(458)	(780)	(929)
Cash from financing activities	292	272	588
Change during the year	306	(171)	(32)
Other Ownership Interests	272	(152)	(29)
Partnership's Share	34	(19)	(3)
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	80	15
Cash used by investing activities	(15)	(391)
Cash from financing activities	(22)	433
Change during the year	43	57
Other Ownership Interests	40	47
Partnership's Share	3	10
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	284	142	154
Cash used by investing activities	(729)	(229)	(89)
Cash from financing activities	538	71	(36)
Change during the year	93	(16)	29
Other Ownership Interests	80	(15)	18
Partnership's Share	$ 13	$ (1)	$ 11

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Utilities
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment, revalued assets, at cost	$ 2,961	$ 2,512
Transport
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment, revalued assets, at cost	1,970	1,845
Energy
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment, revalued assets, at cost	2,246	2,122
Accumulated fair value adjustments
Disclosure of detailed information about property, plant and equipment [line items]
Gain from revaluation	418	335
Accumulated fair value adjustments | Utilities
Disclosure of detailed information about property, plant and equipment [line items]
Gain from revaluation	137	185
Accumulated fair value adjustments | Transport
Disclosure of detailed information about property, plant and equipment [line items]
Gain from revaluation	24	25
Accumulated fair value adjustments | Energy
Disclosure of detailed information about property, plant and equipment [line items]
Gain from revaluation	$ 257	$ 125

PROPERTY, PLANT AND EQUIPMENT97

PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	$ 8,656
Ending balance	9,937	$ 8,656
Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	3,555
Ending balance	4,219	3,555
Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,627
Ending balance	2,843	2,627
Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,474
Ending balance	2,875	2,474
Gross Carrying Amount:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	7,637	6,552
Additions, net of disposals	548	564
Non-cash disposals	(14)	(28)
Acquisitions through business combinations	100	1,067
Net foreign currency exchange differences	486	(518)
Ending balance	8,757	7,637
Gross Carrying Amount: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,895	2,945
Additions, net of disposals	349	399
Non-cash disposals	0	(31)
Acquisitions through business combinations	0	0
Net foreign currency exchange differences	227	(418)
Ending balance	3,471	2,895
Gross Carrying Amount: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,362	2,150
Additions, net of disposals	104	76
Non-cash disposals	0	3
Acquisitions through business combinations	0	242
Net foreign currency exchange differences	191	(109)
Ending balance	2,657	2,362
Gross Carrying Amount: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,380	1,457
Additions, net of disposals	95	89
Non-cash disposals	(14)	0
Acquisitions through business combinations	100	825
Net foreign currency exchange differences	68	9
Ending balance	2,629	2,380
Accumulated depreciation:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(1,158)	(868)
Disposals	40
Non-cash disposals	5	4
Net foreign currency exchange differences	(85)	60
Depreciation expense	(382)	(354)
Ending balance	(1,580)	(1,158)
Accumulated depreciation: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(383)	(291)
Disposals	19
Non-cash disposals	0	0
Net foreign currency exchange differences	(28)	36
Depreciation expense	(118)	(128)
Ending balance	(510)	(383)
Accumulated depreciation: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(517)	(418)
Disposals	21
Non-cash disposals	0	4
Net foreign currency exchange differences	(44)	24
Depreciation expense	(147)	(127)
Ending balance	(687)	(517)
Accumulated depreciation: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(258)	(159)
Disposals	0
Non-cash disposals	5	0
Net foreign currency exchange differences	(13)	0
Depreciation expense	(117)	(99)
Ending balance	(383)	(258)
Accumulated fair value adjustments:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,177	1,948
Fair value adjustments	418	335
Net foreign currency exchange differences	165	(106)
Ending balance	2,760	2,177
Accumulated fair value adjustments: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	1,043	945
Fair value adjustments	137	185
Net foreign currency exchange differences	78	(87)
Ending balance	1,258	1,043
Accumulated fair value adjustments: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	782	777
Fair value adjustments	24	25
Net foreign currency exchange differences	67	(20)
Ending balance	873	782
Accumulated fair value adjustments: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	352	226
Fair value adjustments	257	125
Net foreign currency exchange differences	20	1
Ending balance	$ 629	$ 352

PROPERTY, PLANT AND EQUIPMENT98

PROPERTY, PLANT AND EQUIPMENT - Valuation Technique (Details) - Property, plant and equipment - Recurring fair value measurement - Discounted cash flow model	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Utilities | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	7.00%	7.00%
Terminal Value Multiple	7	7
Investment Horizon	10 years	10 years
Utilities | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	12.00%	12.00%
Terminal Value Multiple	21	18
Investment Horizon	20 years	20 years
Transport | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	10.00%	10.00%
Terminal Value Multiple	9	8
Investment Horizon	10 years	10 years
Transport | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	15.00%	17.00%
Terminal Value Multiple	14	14
Investment Horizon	20 years	20 years
Energy
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Investment Horizon	10 years	10 years
Energy | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	12.00%	9.00%
Terminal Value Multiple	8	10
Energy | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount Rate	15.00%	14.00%
Terminal Value Multiple	13	12

INTANGIBLE ASSETS - Additional

INTANGIBLE ASSETS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]
Intangible assets with indefinite useful life	$ 297,000,000	$ 274,000,000
Chilean toll roads
Disclosure of detailed information about intangible assets [line items]
Annual percent adjustment consumer price index	3.50%
Australian regulated terminal
Disclosure of detailed information about intangible assets [line items]
Percent of take or pay contracts	100.00%
Period of additional extension on take or pay contracts	49 years
Peruvian toll roads
Disclosure of detailed information about intangible assets [line items]
Revenue from construction contracts	$ 31,000,000	66,000,000	$ 0
Profit (loss) recognised on exchanging construction services for financial asset	0	0	0
Borrowing costs capitalised	$ 35,000,000	$ 20,000,000	$ 0

INTANGIBLE ASSETS - Net Amounts

INTANGIBLE ASSETS - Net Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	$ 9,894	$ 4,465
Cost
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	10,470	4,732	$ 3,485
Accumulated amortization
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	$ (576)	$ (267)	$ (189)

INTANGIBLE ASSETS - Cash Genera

INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information for cash-generating units [line items]
Total	$ 9,894	$ 4,465
Brazilian regulated gas transmission operation
Disclosure of information for cash-generating units [line items]
Total	5,134	0
Australian regulated terminal
Disclosure of information for cash-generating units [line items]
Total	1,957	1,817
Peruvian toll roads
Disclosure of information for cash-generating units [line items]
Total	1,144	1,049
Chilean toll roads
Disclosure of information for cash-generating units [line items]
Total	1,100	1,054
U.K. port operation
Disclosure of information for cash-generating units [line items]
Total	289	265
Indian toll roads
Disclosure of information for cash-generating units [line items]
Total	130	136
Other
Disclosure of information for cash-generating units [line items]
Total	$ 140	$ 144

INTANGIBLE ASSETS - Reconciliat

INTANGIBLE ASSETS - Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill
Cost at beginning of the year	$ 4,465
Cost at end of year	9,894	$ 4,465
Cost
Reconciliation of changes in intangible assets other than goodwill
Cost at beginning of the year	4,732	3,485
Additions, net of disposals	79	116
Acquisitions through business combinations	5,515	1,189
Non-cash additions	18	0
Foreign currency translation	126	(58)
Cost at end of year	$ 10,470	$ 4,732

INTANGIBLE ASSETS - Accumulated

INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Cost at beginning of the year	$ 4,465
Cost at end of year	9,894	$ 4,465
Accumulated amortization
Disclosure of detailed information about intangible assets [line items]
Cost at beginning of the year	(267)	(189)
Amortization	(289)	(93)
Foreign currency translation	(20)	15
Cost at end of year	$ (576)	$ (267)

GOODWILL (Details)

GOODWILL (Details) - Goodwill - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in intangible assets and goodwill [abstract]
Balance at beginning of the year	$ 502	$ 79
Acquisitions through business combinations	815	431
Foreign currency translation and other	(16)	(8)
Balance at end of the year	$ 1,301	$ 502

INVESTMENT PROPERTIES (Details)

INVESTMENT PROPERTIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in investment property [abstract]
Balance at beginning of the year	$ 154	$ 153
Additions, net of disposals	0	3
Non-cash additions	0	10
Fair value adjustments	23	12
Foreign currency translation	15	(24)
Balance at December 31	192	154
Investment property completed [member] | U.K. port operation
Reconciliation of changes in investment property [abstract]
Fair value adjustments	$ 23	$ 12
Investment property completed [member] | Transport | Bottom of range | Direct Income Capitalization
Reconciliation of changes in investment property [abstract]
Capitalization rate	6.00%
Investment property completed [member] | Transport | Top of range | Direct Income Capitalization
Reconciliation of changes in investment property [abstract]
Capitalization rate	14.00%

ACCOUNTS PAYABLE AND OTHER (Det

ACCOUNTS PAYABLE AND OTHER (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current:
Accounts payable	$ 246	$ 266
Accrued & other liabilities	400	274
Deferred revenue	159	108
Provisions	59	64
Total current	864	712
Non-current:
Deferred revenue	300	293
Pension liabilities	100	98
Provisions	95	41
Other liabilities	298	148
Total non-current	$ 793	$ 580
Average credit period on purchases of goods and services	30 days

FINANCIAL LIABILITIES (Details)

FINANCIAL LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current:
Foreign currency forward contracts	$ 150	$ 47
Other financial liabilities	87	182
Total current financial liabilities	237	229
Non-current:
Interest rate swaps	9	34
Inflation swaps	84	97
Deferred consideration	916	0
Other financial liabilities	67	21
Total non-current financial liabilities	$ 1,076	$ 152

BORROWINGS - Additional Informa

BORROWINGS - Additional Information (Details)	Oct. 10, 2017USD ($)	Oct. 10, 2017CAD ($)	Mar. 13, 2018USD ($)	Dec. 31, 2017USD ($)extension	Feb. 14, 2018USD ($)	Dec. 31, 2017CAD ($)extension	Apr. 17, 2017USD ($)	Apr. 17, 2017CAD ($)	Feb. 22, 2017USD ($)	Feb. 22, 2017CAD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016CAD ($)
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				$ 10,164,000,000							$ 8,326,000,000
Letter of credit outstanding amount				106,000,000							46,000,000
Subsequent Event
Disclosure of detailed information about borrowings [line items]
Cancellation of letters of credit			$ 59,000,000
Corporate revolving credit facility
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity				$ 1,975,000,000
Unused commitment fee				0.18%		0.18%
Subsidiary and corporate borrowings				$ 789,000,000							0
Letter of credit outstanding amount				$ 106,000,000							46,000,000
Corporate revolving credit facility | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis				1.20%		1.20%
Non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				$ 8,063,000,000							7,324,000,000
Increase in borrowings				739,000,000
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities				379,000,000
Increase (decrease) through financing cash flows, liabilities arising from financing activities				360,000,000
Non-recourse borrowings | CAD
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				397,000,000		$ 499,000,000					263,000,000	$ 354,000,000
Non-recourse borrowings | USD
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				3,087,000,000							3,039,000,000
Medium-term notes, maturing February 22, 2024
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				$ 239,000,000							0
Medium-term notes, maturing February 22, 2024 | Debt Issuers
Disclosure of detailed information about borrowings [line items]
Face amount										$ 300,000,000
Medium-term notes, maturing February 22, 2024 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate				3.30%		3.30%	3.30%	3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate							3.10%	3.10%	3.30%	3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate							4.00%	4.00%	4.10%	4.10%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | CAD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate									3.30%	3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | USD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate									4.10%	4.10%
Medium-term notes, maturing February 22, 2024 | Debt issuance
Disclosure of detailed information about borrowings [line items]
Face amount							$ 309,000,000	$ 400,000,000	$ 228,000,000	$ 300,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				$ 0							295,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Debt Issuers
Disclosure of detailed information about borrowings [line items]
Amount repaid	$ 306,000,000	$ 400,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate				3.50%		3.50%
Corporate borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings				$ 2,101,000,000							1,002,000,000
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities				79,000,000
Revolving credit facility with Brookfield
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity				$ 500,000,000
Borrowings, number of extensions | extension				4		4
Subsidiary and corporate borrowings				$ 0							$ 0
Revolving credit facility with Brookfield | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis				2.00%		2.00%
Commitment fees				$ 0
Revolving credit facility with Brookfield | Subsequent Event
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings			$ 400,000,000
Senior secured notes | Subsequent Event | North American gas storage operation
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings					$ 400,000,000
Borrowings, interest rate					7.00%

BORROWINGS - Corporate Borrowin

BORROWINGS - Corporate Borrowings (Details) - USD ($)	Mar. 13, 2018	Dec. 31, 2017	Apr. 17, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 10,164,000,000		$ 8,326,000,000
Corporate revolving credit facility
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 789,000,000		0
Unused commitment fee		0.18%
Corporate revolving credit facility | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis		1.20%
Medium Term Notes, Public - Canadian - Maturing October 10, 2017
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 0		295,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.50%
Medium Term Notes, Public - Canadian - Maturing October 30, 2018
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 99,000,000		93,000,000
Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.00%
Medium Term Notes, Public - Canadian - Maturing October 30, 2020
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 298,000,000		279,000,000
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.50%
Medium Term Notes, Public - Canadian - Maturing March 11, 2022
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 358,000,000		335,000,000
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.50%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 239,000,000		0
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.30%	3.30%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 318,000,000		0
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Annual Rate		3.30%
Revolving credit facility with Brookfield
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 0		$ 0
Revolving credit facility with Brookfield | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis		2.00%
Subsequent Event | Revolving credit facility with Brookfield
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 400,000,000

BORROWINGS - Non-Recourse Borro

BORROWINGS - Non-Recourse Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Total	$ 10,164	$ 8,326
Non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Current	364	279
Non-current	7,699	7,045
Total	$ 8,063	$ 7,324

BORROWINGS - Repayments on Non-

BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 10,164	$ 8,326
Non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	8,063	7,324
Non-recourse borrowings | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	8,087
Non-recourse borrowings | Deferred financing costs and other
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	(24)
Non-recourse borrowings | 2018 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	372
Non-recourse borrowings | 2019 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	570
Non-recourse borrowings | 2020 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	583
Non-recourse borrowings | 2021 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	695
Non-recourse borrowings | 2022 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	767
Non-recourse borrowings | Thereafter | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	5,100
Non-recourse borrowings | Utilities
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	3,649	3,207
Non-recourse borrowings | Utilities | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	3,650
Non-recourse borrowings | Utilities | Deferred financing costs and other
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	(1)
Non-recourse borrowings | Utilities | 2018 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	0
Non-recourse borrowings | Utilities | 2019 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	87
Non-recourse borrowings | Utilities | 2020 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	304
Non-recourse borrowings | Utilities | 2021 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	461
Non-recourse borrowings | Utilities | 2022 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	440
Non-recourse borrowings | Utilities | Thereafter | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	2,358
Non-recourse borrowings | Transport
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	3,257	3,163
Non-recourse borrowings | Transport | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	3,262
Non-recourse borrowings | Transport | Deferred financing costs and other
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	(5)
Non-recourse borrowings | Transport | 2018 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	143
Non-recourse borrowings | Transport | 2019 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	261
Non-recourse borrowings | Transport | 2020 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	210
Non-recourse borrowings | Transport | 2021 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	230
Non-recourse borrowings | Transport | 2022 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	323
Non-recourse borrowings | Transport | Thereafter | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	2,095
Non-recourse borrowings | Energy
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	1,157	$ 954
Non-recourse borrowings | Energy | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	1,175
Non-recourse borrowings | Energy | Deferred financing costs and other
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	(18)
Non-recourse borrowings | Energy | 2018 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	229
Non-recourse borrowings | Energy | 2019 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	222
Non-recourse borrowings | Energy | 2020 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	69
Non-recourse borrowings | Energy | 2021 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	4
Non-recourse borrowings | Energy | 2022 | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	4
Non-recourse borrowings | Energy | Thereafter | Gross
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 647

BORROWINGS - Weighted Average I

BORROWINGS - Weighted Average Interest Rate (Details) - Interest on non-recourse borrowings - Weighted average	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.00%	5.00%
Utilities
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	4.00%	4.00%
Transport
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.00%	5.00%
Energy
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.00%	5.00%

BORROWINGS - Borrowings by Curr

BORROWINGS - Borrowings by Currency (Details) ₨ in Millions, £ in Millions, S/ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions

Dec. 31, 2017USD ($)

Dec. 31, 2017COP ($)

Dec. 31, 2017GBP (£)

Dec. 31, 2017CLF ( )

Dec. 31, 2017PEN (S/)

Dec. 31, 2017AUD ($)

Dec. 31, 2017CAD ($)

Dec. 31, 2017INR (₨)

Dec. 31, 2017NZD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2016COP ($)

Dec. 31, 2016GBP (£)

Dec. 31, 2016CLF ( )

Dec. 31, 2016PEN (S/)

Dec. 31, 2016AUD ($)

Dec. 31, 2016CAD ($)

Dec. 31, 2016INR (₨)

Dec. 31, 2016NZD ($)

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

$ 10,164

$ 8,326

Interest on non-recourse borrowings

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

8,063

7,324

Interest on non-recourse borrowings | AUD

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

1,013

$ 1,297

922

$ 1,281

Interest on non-recourse borrowings | GBP

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

1,735

£ 1,283

1,390

£ 1,125

Interest on non-recourse borrowings | USD

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

3,087

3,039

Interest on non-recourse borrowings | UF

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

960

22

901

23

Interest on non-recourse borrowings | CAD

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

397

$ 499

263

$ 354

Interest on non-recourse borrowings | COP

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

184

$ 549,384

133

$ 403,030

Interest on non-recourse borrowings | PEN

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

458

S/ 1,483

439

S/ 1,473

Interest on non-recourse borrowings | INR

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

186

₨ 11,847

196

₨ 13,324

Interest on non-recourse borrowings | NZD

Disclosure of detailed information about borrowings [line items]

Subsidiary and corporate borrowings

$ 43

$ 61

$ 41

$ 59

BORROWINGS - Supplemental Cash

BORROWINGS - Supplemental Cash Flows (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Corporate borrowings
Disclosure of reconciliation of liabilities arising from financing activities [abstract]
Beginning Balance	$ 1,002
Cash Flows	1,020
Acquisition	0
Foreign Exchange Movement	79
Fair Value Changes	0
Ending Balance	2,101
Non-recourse borrowings
Disclosure of reconciliation of liabilities arising from financing activities [abstract]
Beginning Balance	7,324
Cash Flows	360
Acquisition	0
Foreign Exchange Movement	379
Fair Value Changes	0
Ending Balance	$ 8,063

SUBSIDIARY PUBLIC ISSUERS - Add

SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ in Millions	Oct. 10, 2017USD ($)	Oct. 10, 2017CAD ($)	Oct. 30, 2015CAD ($)	Dec. 31, 2017	Apr. 17, 2017CAD ($)	Feb. 22, 2017CAD ($)	Mar. 11, 2015CAD ($)
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.30%	3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate					3.10%	3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate					4.00%	4.10%
Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.00%
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.50%
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.50%
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate				3.50%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024
Disclosure of information about consolidated structured entities [line items]
Face amount					$ 400,000,000
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate					3.30%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate					4.00%
Debt Issuers | Medium-term notes, maturing February 22, 2024
Disclosure of information about consolidated structured entities [line items]
Face amount						$ 300,000,000
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate						3.30%
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate						4.10%
Debt Issuers | Medium-term Notes Under The Indenture In The Canadian Bond Market
Disclosure of information about consolidated structured entities [line items]
Face amount			$ 500,000,000
Debt Issuers | Medium-term Notes Under The Indenture In The Canadian Bond Market | Fixed interest rate | USD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate			3.80%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2018
Disclosure of information about consolidated structured entities [line items]
Face amount			$ 125,000,000
Period term			3 years
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate			3.00%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2020
Disclosure of information about consolidated structured entities [line items]
Face amount			$ 375,000,000
Period term			5 years
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate			3.50%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022
Disclosure of information about consolidated structured entities [line items]
Face amount							$ 450,000,000
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate | CAD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate							3.50%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate | USD
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate							3.90%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 10, 2017
Disclosure of information about consolidated structured entities [line items]
Amount repaid	$ 306	$ 400,000,000

SUBSIDIARY PUBLIC ISSUERS - Fin

SUBSIDIARY PUBLIC ISSUERS - Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of comprehensive income [abstract]
Revenues	$ 3,535	$ 2,115	$ 1,855
Net income attributable to partnership	125	487	301
Statement of financial position [abstract]
Current assets	1,512	1,632	1,553
Non-current assets	27,965	19,643	16,182
Current liabilities	1,564	1,515	1,210
Non-current liabilities	14,439	10,116	9,349
Non-controlling interest—Redeemable Partnership Units held by Brookfield	2,012	1,860	1,518
Non-controlling interests—in operating subsidiaries	5,875	2,771
Preferred unitholders	595	375
Our partnership
Statement of comprehensive income [abstract]
Revenues	0	0	0
Net income attributable to partnership	11	285	169
Statement of financial position [abstract]
Current assets	0	0
Non-current assets	5,514	4,937
Current liabilities	0	0
Non-current liabilities	0	0
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0	0
Non-controlling interests—in operating subsidiaries	0	0
Preferred unitholders	0	0
The Issuers
Statement of comprehensive income [abstract]
Revenues	0	0	0
Net income attributable to partnership	0	0	0
Statement of financial position [abstract]
Current assets	0	3
Non-current assets	0	297
Current liabilities	0	5
Non-current liabilities	1,313	1,004
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0	0
Non-controlling interests—in operating subsidiaries	0	0
Preferred unitholders	0	0
Subsidiaries of our partnership other than the Issuers
Statement of comprehensive income [abstract]
Revenues	0	0	0
Net income attributable to partnership	125	487	301
Statement of financial position [abstract]
Current assets	0	0
Non-current assets	5,987	5,248
Current liabilities	0	0
Non-current liabilities	0	0
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0	0
Non-controlling interests—in operating subsidiaries	0	0
Preferred unitholders	0	0
Consolidating adjustments
Statement of comprehensive income [abstract]
Revenues	3,535	2,115	1,855
Net income attributable to partnership	(11)	(285)	$ (169)
Statement of financial position [abstract]
Current assets	1,512	1,629
Non-current assets	16,464	9,161
Current liabilities	1,564	1,510
Non-current liabilities	13,126	9,112
Non-controlling interest—Redeemable Partnership Units held by Brookfield	2,012	1,860
Non-controlling interests—in operating subsidiaries	5,875	2,771
Preferred unitholders	$ 595	$ 375

PREFERRED SHARES (Details)

PREFERRED SHARES (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Sep. 14, 2016
Disclosure of classes of share capital [line items]
Number of shares issued			115,000,000
Preferred shares	$ 20,000,000	$ 20,000,000
Dividend payables	$ 0	0
Preference shares
Disclosure of classes of share capital [line items]
Expected dividend payable as percentage	6.00%
Brookfield Infrastructure Holdings (Canada) Inc.
Disclosure of classes of share capital [line items]
Preferred shares	$ 5,000,000	5,000,000
Brookfield Infrastructure Holdings (Canada) Inc. | Preference shares
Disclosure of classes of share capital [line items]
Number of shares issued	196,000
Brookfield Infrastructure US Holdings I Corporation
Disclosure of classes of share capital [line items]
Preferred shares	$ 5,000,000	5,000,000
Brookfield Infrastructure US Holdings I Corporation | Preferred shares
Disclosure of classes of share capital [line items]
Redemption price per share	$ 5,000,000
Brookfield Infrastructure US Holdings I Corporation | Preference shares
Disclosure of classes of share capital [line items]
Number of shares issued	1
BIP Bermuda Holdings I Limited
Disclosure of classes of share capital [line items]
Preferred shares	$ 10,000,000	$ 10,000,000
BIP Bermuda Holdings I Limited | Preference shares
Disclosure of classes of share capital [line items]
Number of shares issued	400,000
Brookfield Infrastructure Holdings (Canada) Inc. and BIP Bermuda Holdings I Limited | Preferred shares
Disclosure of classes of share capital [line items]
Redemption price per share	$ 25

REVENUES (Details)

REVENUES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of operating segments [line items]
Revenue	$ 3,535	$ 2,115	$ 1,855
Utilities | Regulated Transmission
Disclosure of operating segments [line items]
Revenue	938	27	43
Utilities | Regulated Terminal
Disclosure of operating segments [line items]
Revenue	301	299	330
Utilities | Regulated Distribution
Disclosure of operating segments [line items]
Revenue	546	499	491
Transport | Rail
Disclosure of operating segments [line items]
Revenue	296	270	316
Transport | Ports
Disclosure of operating segments [line items]
Revenue	681	360	220
Transport | Toll Roads
Disclosure of operating segments [line items]
Revenue	313	262	113
Energy | Transmission & Storage
Disclosure of operating segments [line items]
Revenue	150	141	105
Energy | District Energy
Disclosure of operating segments [line items]
Revenue	$ 310	$ 257	$ 237

INTEREST EXPENSE (Details)

INTEREST EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]
Other financing fees	$ 4	$ 3	$ 6
Interest expense	428	392	367
Interest on corporate facility
Disclosure of detailed information about borrowings [line items]
Interest	12	12	5
Interest on corporate debt
Disclosure of detailed information about borrowings [line items]
Interest	51	39	22
Interest on non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Interest	$ 361	$ 338	$ 334

PAYROLL EXPENSE (Details)

PAYROLL EXPENSE (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)employee	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Analysis of income and expense [abstract]
Partnership, number of key employees or directors | employee	0
Payroll expense	$ 519	$ 309	$ 212
Payroll Expense [Line Items]
Directors' remuneration expense	1	1	1
General Partner
Payroll Expense [Line Items]
Directors' remuneration expense	$ 1	$ 1	$ 1

NON-WHOLLY OWNED SUBSIDIARIES -

NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of subsidiaries [line items]
Current Assets	$ 1,512	$ 1,632	$ 1,553
Non-Current Assets	27,965	19,643	16,182
Current Liabilities	1,564	1,515	1,210
Non-Current Liabilities	14,439	10,116	$ 9,349
Non-Wholly Owned Subsidiaries
Disclosure of subsidiaries [line items]
Current Assets	1,430	1,542
Non-Current Assets	19,770	13,034
Current Liabilities	1,465	1,402
Non-Current Liabilities	12,699	8,620
Non-Controlling Interest in Operating Subsidiaries	5,873	2,771
Partnership Capital	1,163	1,783
U.K. regulated distribution
Disclosure of subsidiaries [line items]
Current Assets	107	65
Non-Current Assets	3,550	2,985
Current Liabilities	281	154
Non-Current Liabilities	2,261	1,919
Non-Controlling Interest in Operating Subsidiaries	217	183
Partnership Capital	898	794
Australian regulated terminal
Disclosure of subsidiaries [line items]
Current Assets	38	27
Non-Current Assets	2,229	2,162
Current Liabilities	34	(9)
Non-Current Liabilities	2,035	1,926
Non-Controlling Interest in Operating Subsidiaries	62	70
Partnership Capital	136	202
Colombian regulated distribution
Disclosure of subsidiaries [line items]
Current Assets	68	55
Non-Current Assets	764	701
Current Liabilities	26	27
Non-Current Liabilities	438	369
Non-Controlling Interest in Operating Subsidiaries	302	294
Partnership Capital	66	66
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Current Assets	322
Non-Current Assets	5,990
Current Liabilities	73
Non-Current Liabilities	2,015
Non-Controlling Interest in Operating Subsidiaries	3,081
Partnership Capital	1,143
U.K. port operation
Disclosure of subsidiaries [line items]
Current Assets	44	42
Non-Current Assets	880	754
Current Liabilities	133	108
Non-Current Liabilities	353	324
Non-Controlling Interest in Operating Subsidiaries	179	150
Partnership Capital	259	214
Australian port operation
Disclosure of subsidiaries [line items]
Current Assets	163	142
Non-Current Assets	628	587
Current Liabilities	101	94
Non-Current Liabilities	218	205
Non-Controlling Interest in Operating Subsidiaries	346	315
Partnership Capital	126	115
Chilean toll roads
Disclosure of subsidiaries [line items]
Current Assets	84	102
Non-Current Assets	1,116	1,069
Current Liabilities	59	50
Non-Current Liabilities	989	941
Non-Controlling Interest in Operating Subsidiaries	75	89
Partnership Capital	77	91
Brazilian toll roads
Disclosure of subsidiaries [line items]
Current Assets		42
Non-Current Assets		466
Current Liabilities		27
Non-Current Liabilities		0
Non-Controlling Interest in Operating Subsidiaries		189
Partnership Capital		292
Peruvian toll roads
Disclosure of subsidiaries [line items]
Current Assets	101	127
Non-Current Assets	1,356	1,261
Current Liabilities	18	27
Non-Current Liabilities	674	635
Non-Controlling Interest in Operating Subsidiaries	644	610
Partnership Capital	121	116
Indian toll roads
Disclosure of subsidiaries [line items]
Current Assets	58	52
Non-Current Assets	256	264
Current Liabilities	30	36
Non-Current Liabilities	185	186
Non-Controlling Interest in Operating Subsidiaries	60	58
Partnership Capital	39	36
North American gas storage operation
Disclosure of subsidiaries [line items]
Current Assets	206	199
Non-Current Assets	1,259	1,141
Current Liabilities	244	136
Non-Current Liabilities	409	478
Non-Controlling Interest in Operating Subsidiaries	502	452
Partnership Capital	310	274
Canadian district energy operation
Disclosure of subsidiaries [line items]
Current Assets	75	15
Non-Current Assets	699	570
Current Liabilities	55	13
Non-Current Liabilities	394	290
Non-Controlling Interest in Operating Subsidiaries	243	209
Partnership Capital	82	73
U.S. district energy operation
Disclosure of subsidiaries [line items]
Current Assets	37	43
Non-Current Assets	799	697
Current Liabilities	19	62
Non-Current Liabilities	668	537
Non-Controlling Interest in Operating Subsidiaries	78	73
Partnership Capital	71	68
Holding LP and other
Disclosure of subsidiaries [line items]
Current Assets	127	631
Non-Current Assets	244	377
Current Liabilities	392	677
Non-Current Liabilities	2,060	810
Non-Controlling Interest in Operating Subsidiaries	84	79
Partnership Capital	$ (2,165)	$ (558)

NON-WHOLLY OWNED SUBSIDIARIE122

NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of subsidiaries [line items]
Revenues	$ 3,535	$ 2,115	$ 1,855
Net income (loss) attributable to partnership	125	487	301
Non-Wholly Owned Subsidiaries
Disclosure of subsidiaries [line items]
Revenues	3,177	1,724	1,389
Attributable to non-controlling interest, Net Income (loss)	443	41	90
Attributable to non-controlling interest, Other Comprehensive Income (loss)	146	67	(83)
Net income (loss) attributable to partnership	(7)	163	203
Attributable to unitholders, Other Comprehensive Income (loss)	(210)	126	56
U.K. regulated distribution
Disclosure of subsidiaries [line items]
Revenues	385	347	339
Attributable to non-controlling interest, Net Income (loss)	21	12	21
Attributable to non-controlling interest, Other Comprehensive Income (loss)	29	(14)	25
Net income (loss) attributable to partnership	114	79	122
Attributable to unitholders, Other Comprehensive Income (loss)	118	(55)	101
Australian regulated terminal
Disclosure of subsidiaries [line items]
Revenues	301	299	330
Attributable to non-controlling interest, Net Income (loss)	15	15	15
Attributable to non-controlling interest, Other Comprehensive Income (loss)	3	(5)	(4)
Net income (loss) attributable to partnership	35	46	68
Attributable to unitholders, Other Comprehensive Income (loss)	7	(12)	(9)
Colombian regulated distribution
Disclosure of subsidiaries [line items]
Revenues	161	150	152
Attributable to non-controlling interest, Net Income (loss)	12	10	13
Attributable to non-controlling interest, Other Comprehensive Income (loss)	38	45	(26)
Net income (loss) attributable to partnership	2	2	16
Attributable to unitholders, Other Comprehensive Income (loss)	7	10	(9)
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Revenues	938
Attributable to non-controlling interest, Net Income (loss)	349
Attributable to non-controlling interest, Other Comprehensive Income (loss)	(160)
Net income (loss) attributable to partnership	146
Attributable to unitholders, Other Comprehensive Income (loss)	(72)
U.K. port operation
Disclosure of subsidiaries [line items]
Revenues	180	178	220
Attributable to non-controlling interest, Net Income (loss)	8	11	7
Attributable to non-controlling interest, Other Comprehensive Income (loss)	21	(37)	13
Net income (loss) attributable to partnership	22	20	22
Attributable to unitholders, Other Comprehensive Income (loss)	29	(52)	18
Australian port operation
Disclosure of subsidiaries [line items]
Revenues	501	182
Attributable to non-controlling interest, Net Income (loss)	(7)	(18)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	28	(24)
Net income (loss) attributable to partnership	(3)	(7)
Attributable to unitholders, Other Comprehensive Income (loss)	9	(8)
Chilean toll roads
Disclosure of subsidiaries [line items]
Revenues	154	127	113
Attributable to non-controlling interest, Net Income (loss)	0	(9)	(7)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	7	7	(20)
Net income (loss) attributable to partnership	0	(10)	(15)
Attributable to unitholders, Other Comprehensive Income (loss)	8	8	(21)
Brazilian toll roads
Disclosure of subsidiaries [line items]
Revenues		0
Attributable to non-controlling interest, Net Income (loss)		6
Attributable to non-controlling interest, Other Comprehensive Income (loss)		38
Net income (loss) attributable to partnership		5
Attributable to unitholders, Other Comprehensive Income (loss)		25
Peruvian toll roads
Disclosure of subsidiaries [line items]
Revenues	103	97
Attributable to non-controlling interest, Net Income (loss)	12	(8)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	22	(7)
Net income (loss) attributable to partnership	2	(2)
Attributable to unitholders, Other Comprehensive Income (loss)	5	(1)
Indian toll roads
Disclosure of subsidiaries [line items]
Revenues	57	39
Attributable to non-controlling interest, Net Income (loss)	(2)	(3)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	4	1
Net income (loss) attributable to partnership	(1)	(3)
Attributable to unitholders, Other Comprehensive Income (loss)	3	0
North American gas storage operation
Disclosure of subsidiaries [line items]
Revenues	149	100	20
Attributable to non-controlling interest, Net Income (loss)	30	1	(8)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	74	0	5
Net income (loss) attributable to partnership	18	1	(12)
Attributable to unitholders, Other Comprehensive Income (loss)	47	0	1
Canadian district energy operation
Disclosure of subsidiaries [line items]
Revenues	95	79	80
Attributable to non-controlling interest, Net Income (loss)	(2)	(1)	0
Attributable to non-controlling interest, Other Comprehensive Income (loss)	39	31	6
Net income (loss) attributable to partnership	0	1	0
Attributable to unitholders, Other Comprehensive Income (loss)	13	11	2
U.S. district energy operation
Disclosure of subsidiaries [line items]
Revenues	131	111	114
Attributable to non-controlling interest, Net Income (loss)	10	(6)	(6)
Attributable to non-controlling interest, Other Comprehensive Income (loss)	40	31	8
Net income (loss) attributable to partnership	7	0	(3)
Attributable to unitholders, Other Comprehensive Income (loss)	26	20	5
Holding LP and other
Disclosure of subsidiaries [line items]
Revenues	22	15	21
Attributable to non-controlling interest, Net Income (loss)	(3)	31	55
Attributable to non-controlling interest, Other Comprehensive Income (loss)	1	1	(90)
Net income (loss) attributable to partnership	(349)	31	5
Attributable to unitholders, Other Comprehensive Income (loss)	$ (410)	$ 180	$ (32)

NON-WHOLLY OWNED SUBSIDIARIE123

NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	$ 1,481	$ 753	$ 632
Cash Flow Activities, Investing	(5,721)	(1,058)	(2,346)
Cash Flow Activities, Financing	3,814	899	1,764
Non-Wholly Owned Subsidiaries
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	1,364	681	506
Cash Flow Activities, Investing	(5,621)	(995)	(1,031)
Cash Flow Activities, Financing	3,840	901	564
U.K. regulated distribution
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	220	244	164
Cash Flow Activities, Investing	(343)	(487)	(242)
Cash Flow Activities, Financing	129	245	92
Australian regulated terminal
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	96	128	103
Cash Flow Activities, Investing	(9)	(22)	(37)
Cash Flow Activities, Financing	(87)	(106)	(67)
New England electricity transmission operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating			2
Cash Flow Activities, Investing			0
Cash Flow Activities, Financing			(2)
Colombian regulated distribution
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	7	17	16
Cash Flow Activities, Investing	(22)	(18)	(6)
Cash Flow Activities, Financing	26	0	(7)
Brazilian regulated gas transmission operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	819	0
Cash Flow Activities, Investing	83	0
Cash Flow Activities, Financing	(839)	0
U.K. port operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	46	33	19
Cash Flow Activities, Investing	(40)	(24)	(66)
Cash Flow Activities, Financing	(10)	(14)	61
Australian port operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	37	7	0
Cash Flow Activities, Investing	(39)	(99)	0
Cash Flow Activities, Financing	12	154	0
Chilean toll roads
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	56	63	70
Cash Flow Activities, Investing	(5)	(1)	0
Cash Flow Activities, Financing	(88)	(99)	(38)
Brazilian toll roads
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	0	2
Cash Flow Activities, Investing	0	(70)
Cash Flow Activities, Financing	0	70
Peruvian toll roads
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	46	29
Cash Flow Activities, Investing	(67)	25
Cash Flow Activities, Financing	0	1
Indian toll roads
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	30	(7)
Cash Flow Activities, Investing	(7)	28
Cash Flow Activities, Financing	(22)	(10)
North American gas storage operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	55	(12)	(3)
Cash Flow Activities, Investing	(9)	6	(1)
Cash Flow Activities, Financing	(76)	46	1
Canadian district energy operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	26	27	22
Cash Flow Activities, Investing	(82)	(18)	(16)
Cash Flow Activities, Financing	102	(13)	(23)
U.S. district energy operation
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	24	26	21
Cash Flow Activities, Investing	8	(33)	(13)
Cash Flow Activities, Financing	(28)	9	(7)
Holding LP and other
Disclosure of subsidiaries [line items]
Cash Flow Activities, Operating	(98)	124	92
Cash Flow Activities, Investing	(5,089)	(282)	(650)
Cash Flow Activities, Financing	$ 4,721	$ 618	$ 554

INCOME TAXES - Additional Infor

INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 859	$ 820
Temporary differences associated with investments in subsidiaries, associates and joint ventures for which deferred tax liabilities have not been recognised	2,411	2,230
Capital Losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	480	442
Non-Capital Losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	379	378
Non-Capital Losses | Expire between 2020 to 2030
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	7	5
Non-Capital Losses | Have no expiry dates
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 372	373
Indian toll roads
Disclosure of detailed information about business combination [line items]
Net deferred tax assets		$ 10

INCOME TAXES - Deferred Income

INCOME TAXES - Deferred Income Tax Balances (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax assets, gross	$ 361	$ 482
Deferred income tax liabilities, gross	(3,144)	(2,020)
Deferred income tax assets	66	74
Deferred income tax liabilities	(2,849)	(1,612)
Net deferred income tax liabilities	(2,783)	(1,538)	$ (1,303)
Tax losses carried forward
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax assets, gross	361	357
Net deferred income tax liabilities	361	357	$ 239
Financial instruments and other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax assets, gross	0	125
Deferred income tax liabilities, gross	(9)	0
Property, plant and equipment and investment properties
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liabilities, gross	(1,374)	(1,306)
Intangible assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liabilities, gross	$ (1,761)	$ (714)

INCOME TAXES - Deferred Tax Bal

INCOME TAXES - Deferred Tax Balances and Movement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [abstract]
Net deferred income tax liabilities	$ (1,538)	$ (1,303)
Net Income	(67)	18
Other Comprehensive Income	(200)	(75)	$ (141)
Other	(48)	56
Acquisitions (Dispositions)	(930)	(234)
Net deferred income tax liabilities	(2,783)	(1,538)	(1,303)
Deferred income tax assets related to non-capital losses and capital losses
Reconciliation of changes in deferred tax liability (asset) [abstract]
Net deferred income tax liabilities	357	239
Net Income	(19)	17
Other Comprehensive Income	0	0
Other	23	4
Acquisitions (Dispositions)	0	97
Net deferred income tax liabilities	361	357	239
Deferred income tax liabilities related to differences in tax and book basis, net
Reconciliation of changes in deferred tax liability (asset) [abstract]
Net deferred income tax liabilities	(1,895)	(1,542)
Net Income	(48)	1
Other Comprehensive Income	(200)	(75)
Other	(71)	52
Acquisitions (Dispositions)	(930)	(331)
Net deferred income tax liabilities	$ (3,144)	$ (1,895)	$ (1,542)

INCOME TAXES - Income Tax Recog

INCOME TAXES - Income Tax Recognized in Profit or Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Current income tax expense	$ 106	$ 33	$ 22
Origination and reversal of temporary differences	92	(62)	4
Changes in tax rates or the imposition of new taxes	(41)	1	(28)
Previously unrecognized deferred taxes	16	43	(2)
Net income before income tax	747	543	387
Income tax expense calculated at the domestic rates applicable to profits in the country concerned	304	77	74
Change in substantively enacted tax rates	(41)	1	(28)
Earnings from investments in associates and joint ventures	(12)	(34)	(16)
Portion of gains subject to different tax rates	2	(54)	2
Taxable income attributable to non-controlling interests	(65)	(7)	(25)
International operations subject to different tax rates	(39)	(6)	(8)
Deferred tax assets not recognized	15	41	4
Permanent differences and other	9	(3)	(7)
Total income tax expense (recovery)	$ 173	$ 15	$ (4)

INCOME TAXES - Income Tax Re128

INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	$ (200)	$ (75)	$ (141)
Revaluation of property, plant and equipment
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	(204)	(90)	(130)
Cash flow hedges
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	8	8	(15)
Other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	$ (4)	$ 7	$ 4

PARTNERSHIP CAPITAL - Additiona

PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions	Jan. 23, 2018USD ($)shares	Jan. 23, 2018CAD ($)$ / sharesshares	Jan. 26, 2017USD ($)shares	Jan. 26, 2017CAD ($)$ / sharesshares	Sep. 30, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Aug. 31, 2016USD ($)shares	Aug. 31, 2016CAD ($)$ / sharesshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2015CAD ($)$ / sharesshares	Apr. 30, 2015USD ($)$ / sharesshares	Mar. 31, 2015USD ($)shares	Mar. 31, 2015CAD ($)$ / sharesshares	Dec. 31, 2017USD ($)day$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)shares	Sep. 14, 2016shares
Schedule of Partnership Units [Line Items]
Number of shares issued | shares																	115
Stock split conversion ratio																	1.5
Additional unit received for each unit held in stock split																	0.5
Partnership units issued, net of issuance costs | $														$ 992	$ 755	$ 932
Share issue related cost (less than) | $					$ 28	$ 20					$ 24
Repurchased and cancelled | $															6	67
Share repurchase related cost | $															$ 1	$ 1
Volume weighted average of trading price, number of trading days | day														5
Preferred Unitholders Capital
Schedule of Partnership Units [Line Items]
Issued for cash | shares														12	10	10
Preferred Unitholders Capital | Series 9 Preferred Units | Subsequent Event
Schedule of Partnership Units [Line Items]
Issued for cash | shares	8	8
Number of share issued, price per share | $ / shares		$ 25
Partnership units issued, net of issuance costs	$ 161	$ 200
Share issue related cost (less than) | $	$ 1
Quarterly fixed distribution rate	5.00%	5.00%
Underwriting related cost | $	$ 4
Preferred Unitholders Capital | Series 7 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash | shares			12	12
Number of share issued, price per share | $ / shares				$ 25
Partnership units issued, net of issuance costs			$ 225	$ 300
Share issue related cost (less than) | $			$ 1
Quarterly fixed distribution rate			5.00%	5.00%
Underwriting related cost | $			$ 5
Preferred Unitholders Capital | Series 5 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash | shares							10	10
Number of share issued, price per share | $ / shares								$ 25
Partnership units issued, net of issuance costs							$ 190	$ 250
Share issue related cost (less than) | $							$ 4
Quarterly fixed distribution rate							5.35%	5.35%
Preferred Unitholders Capital | Series 3 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash | shares									5	5
Number of share issued, price per share | $ / shares										$ 25
Partnership units issued, net of issuance costs									$ 95	$ 125
Share issue related cost (less than) | $									$ 2
Quarterly fixed distribution rate									5.50%	5.50%
Preferred Unitholders Capital | Series 1 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash | shares												5	5
Number of share issued, price per share | $ / shares													$ 25
Partnership units issued, net of issuance costs												$ 100	$ 125
Share issue related cost (less than) | $												$ 4
Quarterly fixed distribution rate												4.50%	4.50%
Special General Partner
Schedule of Partnership Units [Line Items]
Partnership distributions | $														$ 113	$ 80	$ 64
Weighted average number of shares outstanding | shares														1.6	1.6	1.6
Special General Partner | Partners' capital
Schedule of Partnership Units [Line Items]
Issued for cash | shares														0	0	0
Repurchased and cancelled | shares														0	0	0
Repurchased and cancelled | $														$ 0	$ 0	$ 0
Limited Partners
Schedule of Partnership Units [Line Items]
Increase in equity | $					$ 6	$ 16
Repurchased and cancelled | $															$ 6	$ 67
Weighted average number of shares outstanding | shares														264.6	244.7	238.9
Limited Partners | Partners' capital
Schedule of Partnership Units [Line Items]
Issued for cash | shares					16.6	15.6					20			17.2	16.4	20.2
Number of share issued, price per share | $ / shares					$ 42	$ 32					$ 30				$ 32
Partnership units issued, net of issuance costs | $					$ 700	$ 500					$ 600
Repurchased and cancelled | shares														0	0.2	2.5
Repurchased and cancelled | $														$ 0	$ 6	$ 67
Dividend reinvestment plan, unit issued (less than) | shares														1	1	1
Dividend reinvestment plan, proceeds | $														$ 20	$ 25	$ 6
Limited Partners | Partners' capital | Top of range
Schedule of Partnership Units [Line Items]
Repurchased and cancelled | shares															1
Special General Partner and Limited Partner | Partners' capital
Schedule of Partnership Units [Line Items]
Issued for cash | shares														17.2	16.4	20.2
Repurchased and cancelled | shares														0	0.2	2.5
Repurchased and cancelled | $														$ 0	$ 6	$ 67
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital
Schedule of Partnership Units [Line Items]
Issued for cash | shares					7.4	8.1					12.2			7.4	8.1	12.2
Partnership units issued, net of issuance costs | $					$ 300	$ 250					$ 350
Weighted average number of shares outstanding | shares														110.6	100.9	96.9
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital | Holding LP and other
Schedule of Partnership Units [Line Items]
Number of shares issued | shares														115.8
Incentive Distribution, $0.203 Threshold | Special General Partner | Holding LP and other | Holding LP’s units (other than Holding LP Class A Preferred Units)
Schedule of Partnership Units [Line Items]
Distributions threshold, per quarter, per share | $ / shares														$ 0.203
Distribution rights entitle as percent, threshold														15.00%
Incentive Distribution, $0.22 Threshold | Special General Partner | Holding LP and other | Holding LP’s units (other than Holding LP Class A Preferred Units)
Schedule of Partnership Units [Line Items]
Distributions threshold, per quarter, per share | $ / shares														$ 0.22
Distribution rights entitle as percent, threshold														25.00%

PARTNERSHIP CAPITAL - Capital C

PARTNERSHIP CAPITAL - Capital Cathegories (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Apr. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 9,644	$ 7,176	$ 6,322
Changes in equity [abstract]
Unit issuance				992	755	932
Repurchased and cancelled					(6)	(67)
Balance as		$ 9,644		13,474	9,644	7,176
Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				4,611	3,838	3,533
Changes in equity [abstract]
Unit issuance				692	505	582
Repurchased and cancelled					(6)	(67)
Balance as		4,611		4,967	4,611	3,838
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				1,860	1,518	1,321
Changes in equity [abstract]
Unit issuance				300	250	350
Balance as		$ 1,860		2,012	1,860	1,518
Partners' capital | Special General Partner and Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 4,234	$ 3,735	$ 3,220
Changes in equity [abstract]
Opening balance				261	244.8	227.1
Issued for cash				17.2	16.4	20.2
Repurchased and cancelled				0	(0.2)	(2.5)
Ending balance		261		278.2	261	244.8
Unit issuance				$ 692	$ 505	$ 582
Repurchased and cancelled				0	(6)	(67)
Balance as		$ 4,234		4,926	4,234	3,735
Partners' capital | Special General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 19	$ 19	$ 19
Changes in equity [abstract]
Opening balance				1.6	1.6	1.6
Issued for cash				0	0	0
Repurchased and cancelled				0	0	0
Ending balance		1.6		1.6	1.6	1.6
Unit issuance				$ 0	$ 0	$ 0
Repurchased and cancelled				0	0	0
Balance as		$ 19		19	19	19
Partners' capital | Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 4,215	$ 3,716	$ 3,201
Changes in equity [abstract]
Opening balance				259.4	243.2	225.5
Issued for cash	16.6	15.6	20	17.2	16.4	20.2
Repurchased and cancelled				0	(0.2)	(2.5)
Ending balance		259.4		276.6	259.4	243.2
Unit issuance				$ 692	$ 505	$ 582
Repurchased and cancelled				0	(6)	(67)
Balance as		$ 4,215		4,907	4,215	3,716
Partners' capital | Non-Controlling Interest—Redeemable Partnership Units held by Brookfield
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 1,778	$ 1,528	$ 1,178
Changes in equity [abstract]
Opening balance				108.4	100.3	88.1
Issued for cash	7.4	8.1	12.2	7.4	8.1	12.2
Ending balance		108.4		115.8	108.4	100.3
Unit issuance				$ 300	$ 250	$ 350
Balance as		$ 1,778		2,078	1,778	1,528
Preferred Unitholders Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as				$ 375	$ 189	$ 0
Changes in equity [abstract]
Opening balance				20	10	0
Issued for cash				12	10	10
Ending balance		20		32	20	10
Unit issuance				$ 220	$ 186	$ 189
Balance as		$ 375		$ 595	$ 375	$ 189

ACCUMULATED OTHER COMPREHENS131

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		$ 9,644	$ 7,176	$ 6,322
Other comprehensive income (loss)		323	576	(202)
Other items (note 26)		0	9	0
Balance as		13,474	9,644	7,176
Limited Partners
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		4,611	3,838	3,533
Other comprehensive income (loss)		128	358	(86)
Other items (note 26)		6	17	49
Balance as		4,967	4,611	3,838
Limited Partners | Accumulated Other Comprehensive Income
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	[1]	736	555	655
Other comprehensive income (loss)	[1]	128	358	(86)
Other items (note 26)	[1]		(177)	(6)
Balance as	[1]	864	736	555
Limited Partners | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		957	1,042
Other comprehensive income (loss)		19	93
Other items (note 26)			(178)
Balance as		976	957	1,042
Limited Partners | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(891)	(889)
Other comprehensive income (loss)		56	(5)
Other items (note 26)			3
Balance as		(835)	(891)	(889)
Limited Partners | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		215	99
Other comprehensive income (loss)		(187)	117
Other items (note 26)			(1)
Balance as		28	215	99
Limited Partners | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(130)	(140)
Other comprehensive income (loss)		104	9
Other items (note 26)			1
Balance as		(26)	(130)	(140)
Limited Partners | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(4)	(9)
Other comprehensive income (loss)		4	5
Other items (note 26)			0
Balance as		0	(4)	(9)
Limited Partners | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(30)	(13)
Other comprehensive income (loss)		3	(17)
Other items (note 26)			0
Balance as		(27)	(30)	(13)
Limited Partners | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		619	465
Other comprehensive income (loss)		129	156
Other items (note 26)			(2)
Balance as		748	619	465
General Partner
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		27	23	24
Other comprehensive income (loss)		(1)	4	(1)
Balance as		25	27	23
General Partner | Accumulated Other Comprehensive Income
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	[1]	7	4	5
Other comprehensive income (loss)	[1]	(1)	4	(1)
Other items (note 26)	[1]		(1)
Balance as	[1]	6	7	4
General Partner | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		7	7
Other comprehensive income (loss)		0	1
Other items (note 26)			(1)
Balance as		7	7	7
General Partner | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(5)	(5)
Other comprehensive income (loss)		(1)	0
Other items (note 26)			0
Balance as		(6)	(5)	(5)
General Partner | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		3	1
Other comprehensive income (loss)		(2)	2
Other items (note 26)			0
Balance as		1	3	1
General Partner | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(1)	(1)
Other comprehensive income (loss)		1	0
Other items (note 26)			0
Balance as		0	(1)	(1)
General Partner | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0	0
Other comprehensive income (loss)		0	0
Other items (note 26)			0
Balance as		0	0	0
General Partner | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0	0
Other comprehensive income (loss)		0	0
Other items (note 26)			0
Balance as		0	0	0
General Partner | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		3	2
Other comprehensive income (loss)		1	1
Other items (note 26)			0
Balance as		4	3	2
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		1,860	1,518	1,321
Other comprehensive income (loss)		56	147	(32)
Other items (note 26)		(6)	(15)	(49)
Balance as		2,012	1,860	1,518
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Accumulated Other Comprehensive Income
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	[1]	331	254	283
Other comprehensive income (loss)	[1]	56	147	(32)
Other items (note 26)	[1]		(70)	6
Balance as	[1]	387	331	254
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		417	447
Other comprehensive income (loss)		8	38
Other items (note 26)			(68)
Balance as		425	417	447
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(365)	(358)
Other comprehensive income (loss)		26	(4)
Other items (note 26)			(3)
Balance as		(339)	(365)	(358)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		88	38
Other comprehensive income (loss)		(77)	49
Other items (note 26)			1
Balance as		11	88	38
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(58)	(61)
Other comprehensive income (loss)		44	4
Other items (note 26)			(1)
Balance as		(14)	(58)	(61)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(3)	(4)
Other comprehensive income (loss)		1	2
Other items (note 26)			(1)
Balance as		(2)	(3)	(4)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(9)	(2)
Other comprehensive income (loss)		1	(7)
Other items (note 26)			0
Balance as		(8)	(9)	(2)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		261	194
Other comprehensive income (loss)		53	65
Other items (note 26)			2
Balance as		$ 314	$ 261	$ 194
[1]	Refer to Note 27, Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.

DISTRIBUTIONS (Details)

DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 08, 2018
Disclosure of classes of share capital [line items]
Partnership distributions	$ 764	$ 615	$ 543
Preferred Unitholders Capital
Disclosure of classes of share capital [line items]
Partnership distributions	$ 30	13	3
Partnership distributions (usd per share)	$ 0.94
Subsequent Event
Disclosure of classes of share capital [line items]
Increase in dividends payable per share, percent				8.00%
Quarterly distribution (usd per share)				$ 0.47
Partnership Unitholders Excluding Special General Partner
Disclosure of classes of share capital [line items]
Partnership distributions	$ 651	$ 535	$ 479
Partnership distributions (usd per share)	$ 1.74	$ 1.55	$ 1.41
Special General Partner
Disclosure of classes of share capital [line items]
Partnership distributions	$ 113	$ 80	$ 64

CONTINGENT ASSETS & LIABILIT133

CONTINGENT ASSETS & LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Contingent liability for guarantees
Disclosure of contingent liabilities [line items]
Contingent liabilities related to third parties	$ 182	$ 141

CONTRACTUAL COMMITMENTS (Detail

CONTRACTUAL COMMITMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Contractual Commitments [Abstract]
Contractual commitments	$ 1,448	$ 1,201
Asset management fee as percent per quarter	0.3125%
Asset management fee, percent	1.25%
Less than 1 year
Disclosure of contingent liabilities [line items]
Contractual capital commitments, maturity, percent	32.00%
1 to 5 years
Disclosure of contingent liabilities [line items]
Contractual capital commitments, maturity, percent	42.00%
Thereafter
Disclosure of contingent liabilities [line items]
Contractual capital commitments, maturity, percent	26.00%

RETIREMENT BENEFIT PLANS (Detai

RETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits [Abstract]
Benefit plans' expense	$ 10	$ 7	$ 1
Discount rates	4.10%	4.20%	6.10%
Rates of compensation	3.50%	3.50%	3.30%
Surplus (deficit) in plan [abstract]
Plan assets	$ 228	$ 198
Less accrued benefit obligation	(328)	(296)
Accrued benefit liability	$ (100)	$ (98)

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions between related parties [line items]
Directors' fees (less than)	$ 1	$ 1	$ 1
Asset management fee as percent per quarter	0.3125%
Asset management fee, percent	1.25%
Service Provider
Disclosure of transactions between related parties [line items]
Asset management fee as percent per quarter	0.3125%
Asset management fee, percent	1.25%
Services received, related party transactions	$ 230	158	126
Amounts payable, related party transactions	64	42
Services reimbursed, related party transactions	6	5	8
Brookfield
Disclosure of transactions between related parties [line items]
Deposit balance	1	255
Earned interest on deposits	1	1	1
Subsidiary of Common Parent (Brookfield)
Disclosure of transactions between related parties [line items]
Services received, related party transactions	1	1	1
Amounts payable, related party transactions	75	75
Amounts receivable, related party transactions	$ 20	20
Subsidiary of Common Parent (Brookfield) | Top of range
Disclosure of transactions between related parties [line items]
Amounts payable, related party transactions, interest rate	3.80%
Subsidiary of Common Parent (Brookfield) | Bottom of range
Disclosure of transactions between related parties [line items]
Amounts payable, related party transactions, interest rate	8.50%
Subsidiary of Common Parent (Brookfield) | Brookfield Office Properties Inc.
Disclosure of transactions between related parties [line items]
Services received, related party transactions	$ 4	1	1
Revenue from rendering of services, related party transactions	8	$ 1	$ 1
Subsidiary of Common Parent (Brookfield) | Brookfield Business Partners LP
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions	$ 2

DERIVATIVE FINANCIAL INSTRUM137

DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Notional Amount (U.S. Dollars)	$ 8,829	$ 8,904
Interest rate and cross currency interest rate swap contracts
Disclosure of detailed information about hedging instruments [line items]
Notional Amount (U.S. Dollars)	4,843	4,261
Financial assets at fair value through profit or loss, category [member]
Disclosure of detailed information about hedging instruments [line items]
Notional Amount (U.S. Dollars)	2,433	2,258
Financial assets at fair value through profit or loss, category [member] | Interest rate and cross currency interest rate swap contracts
Disclosure of detailed information about hedging instruments [line items]
Notional Amount (U.S. Dollars)	816	752
Financial assets at fair value through profit or loss, category [member] | Inflation linked swap contract
Disclosure of detailed information about hedging instruments [line items]
Notional Amount (U.S. Dollars)	$ 170	$ 155

DERIVATIVE FINANCIAL INSTRUM138

DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Positions (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	$ 8,829	$ 8,904
Foreign exchange contracts
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	3,816	4,488
Interest rates swaps and other
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	$ 5,013	$ 4,416

DERIVATIVE FINANCIAL INSTRUM139

DERIVATIVE FINANCIAL INSTRUMENTS - Change in Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Unrealized Gains on Derivative Financial Assets	$ 132
Unrealized Losses on Derivative Financial Liabilities	(374)
Net Change	(242)	$ 112
Foreign exchange contracts
Disclosure of detailed information about hedging instruments [line items]
Unrealized Gains on Derivative Financial Assets	0
Unrealized Losses on Derivative Financial Liabilities	(305)
Net Change	(305)	97
Interest rates swaps and other
Disclosure of detailed information about hedging instruments [line items]
Unrealized Gains on Derivative Financial Assets	132
Unrealized Losses on Derivative Financial Liabilities	(69)
Net Change	$ 63	$ 15

DERIVATIVE FINANCIAL INSTRUM140

DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 8,829	$ 8,904
Foreign exchange contracts
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	3,816	4,488
Foreign exchange contracts | Australian dollars
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 1,214	$ 2,133
Average Exchange Rate	74.00%	73.00%
Foreign exchange contracts | British pounds
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 2,069	$ 1,810
Average Exchange Rate	130.00%	130.00%
Foreign exchange contracts | European Union euros
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 491	$ 374
Average Exchange Rate	117.00%	114.00%
Foreign exchange contracts | Brazilian reais
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 0	$ 144
Average Exchange Rate	0.00%	337.00%
Foreign exchange contracts | Canadian dollars
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 42	$ 27
Average Exchange Rate	77.00%	76.00%

DERIVATIVE FINANCIAL INSTRUM141

DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Instruments Fair Value Through Profit or Loss (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	$ 8,829	$ 8,904
Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,433	2,258
Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	6,396	6,645
Less than 1 year | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	913
Less than 1 year | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,887
1 to 5 years | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,291
1 to 5 years | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,632
Thereafter | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	229
Thereafter | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,877
Foreign exchange contracts
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	3,816	4,488
Foreign exchange contracts | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,447	1,351
Foreign exchange contracts | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,369	3,136
Foreign exchange contracts | Less than 1 year | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	640
Foreign exchange contracts | Less than 1 year | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,788
Foreign exchange contracts | 1 to 5 years | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	807
Foreign exchange contracts | 1 to 5 years | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	581
Foreign exchange contracts | Thereafter | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	0
Foreign exchange contracts | Thereafter | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	0
Interest rate and cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	4,843	4,261
Interest rate and cross currency interest rate swaps | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	816	752
Interest rate and cross currency interest rate swaps | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	4,027	3,509
Interest rate and cross currency interest rate swaps | Less than 1 year | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	273
Interest rate and cross currency interest rate swaps | Less than 1 year | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	99
Interest rate and cross currency interest rate swaps | 1 to 5 years | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	484
Interest rate and cross currency interest rate swaps | 1 to 5 years | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,051
Interest rate and cross currency interest rate swaps | Thereafter | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	59
Interest rate and cross currency interest rate swaps | Thereafter | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	1,877
Inflation linked swaps | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	170	$ 155
Inflation linked swaps | Less than 1 year | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	0
Inflation linked swaps | 1 to 5 years | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	0
Inflation linked swaps | Thereafter | Fair value through profit or loss
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	$ 170

DERIVATIVE FINANCIAL INSTRUM142

DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	$ 8,829	$ 8,904
Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	6,396	6,645
Effective Portion	(182)	83
Ineffective Portion	0	1
Cash flow hedges | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	4,027	3,509
Effective Portion	15	30
Ineffective Portion	0	1
Net investment hedges | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,369	3,136
Effective Portion	(197)	53
Ineffective Portion	$ 0	$ 0

FINANCIAL RISK MANAGEMENT FINAN

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Additional Information (Details) - USD ($)	2 Months Ended	12 Months Ended
	Mar. 13, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Financial assets		$ 2,134,000,000	$ 2,412,000,000
Subsidiary and corporate borrowings		10,164,000,000	8,326,000,000
Letter of credit outstanding amount		106,000,000	46,000,000
Credit facility
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity		500,000,000
Subsidiary and corporate borrowings		0	0
Corporate revolving credit facility
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity		1,975,000,000
Subsidiary and corporate borrowings		789,000,000	0
Letter of credit outstanding amount		106,000,000	46,000,000
Marketable securities
Disclosure of detailed information about borrowings [line items]
Financial assets		85,000,000	$ 3,000,000
Market risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% change in value of investments on Equity		9,000,000
Impact of 10% change in value of investments on Comprehensive Income		$ 9,000,000
Subsequent Event
Disclosure of detailed information about borrowings [line items]
Cancellation of letters of credit	$ 59,000,000
Subsequent Event | Credit facility
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 400,000,000

FINANCIAL RISK MANAGEMENT FI144

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Capital Structure (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments [Abstract]
Subsidiary and corporate borrowings	$ 10,164	$ 8,326
Preferred shares	20	20
Cash and cash equivalents	(459)	(789)
Total partnership capital	9,725	7,557
Total partnership capital	13,474	9,644	$ 7,176	$ 6,322
Total capital and net debt	$ 23,199	$ 17,201
Net debt to capitalization ratio	42.00%	44.00%

FINANCIAL RISK MANAGEMENT FI145

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments [Abstract]
Corporate cash and financial assets	$ 205	$ 549
Availability under committed credit facilities	2,475	2,475
Draws on credit facility	(789)	0
Commitments under credit facility	(106)	(46)
Corporate liquidity	$ 1,785	$ 2,978

FINANCIAL RISK MANAGEMENT - Mat

FINANCIAL RISK MANAGEMENT - Maturity Analysis of Financial Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Accounts payable and other liabilities	$ 1,043	$ 786
Corporate borrowings	2,101	1,002
Non-recourse borrowings	8,087	7,336
Financial liabilities (current and non-current)	1,313	381
Interest Expense:
Corporate borrowings	227	147
Non-recourse borrowings	2,936	3,024
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Accounts payable and other liabilities	646	540
Corporate borrowings	99	295
Non-recourse borrowings	372	286
Financial liabilities (current and non-current)	237	229
Interest Expense:
Corporate borrowings	49	40
Non-recourse borrowings	381	361
1-2 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Accounts payable and other liabilities	45	34
Corporate borrowings	0	93
Non-recourse borrowings	571	233
Financial liabilities (current and non-current)	58	29
Interest Expense:
Corporate borrowings	47	29
Non-recourse borrowings	348	342
2-5 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Accounts payable and other liabilities	59	26
Corporate borrowings	1,445	279
Non-recourse borrowings	2,043	1,708
Financial liabilities (current and non-current)	930	49
Interest Expense:
Corporate borrowings	106	64
Non-recourse borrowings	864	871
5 plus years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Accounts payable and other liabilities	293	186
Corporate borrowings	557	335
Non-recourse borrowings	5,101	5,109
Financial liabilities (current and non-current)	88	74
Interest Expense:
Corporate borrowings	25	14
Non-recourse borrowings	$ 1,343	$ 1,450

FINANCIAL RISK MANAGEMENT FI147

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Sensitivity Analysis for Interest Rate Risk (Details) - Interest rate risk - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10 bp decrease on Net income (loss)	$ 0	$ 1	$ 2
Impact of 10 bp increase on Net income (loss)	0	(1)	(2)
Impact of 10 bp decrease on Other comprehensive (loss) income	(1)	(1)	(2)
Impact of 10 bp increase on Other comprehensive (loss) income	$ 1	$ 1	$ 2

FINANCIAL RISK MANAGEMENT FI148

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Currency Exposure (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Current Assets	$ 1,512	$ 1,632	$ 1,553
Non-Current Assets	27,965	19,643	16,182
Total assets	29,477	21,275	17,735
Liabilities:
Current Liabilities	1,564	1,515	1,210
Non-Current Liabilities	14,439	10,116	9,349
Total liabilities	16,003	11,631	10,559
Non-controlling interest—in operating subsidiaries and preferred unitholders	6,470	3,146	1,797
Non-controlling interest—Redeemable Partnership Units held by Brookfield	2,012	1,860	1,518
Net investment	4,992	4,638	3,861
USD
Assets:
Current Assets	358	849	234
Non-Current Assets	4,400	3,744	2,485
Total assets	4,758	4,593	2,719
Liabilities:
Current Liabilities	641	833	502
Non-Current Liabilities	3,093	1,636	1,714
Total liabilities	3,734	2,469	2,216
Non-controlling interest—in operating subsidiaries and preferred unitholders	602	919	377
Non-controlling interest—Redeemable Partnership Units held by Brookfield	(50)	344	36
Net investment	472	861	90
AUD
Assets:
Current Assets	276	214	380
Non-Current Assets	5,770	5,542	5,816
Total assets	6,046	5,756	6,196
Liabilities:
Current Liabilities	227	206	103
Non-Current Liabilities	3,983	3,764	3,745
Total liabilities	4,210	3,970	3,848
Non-controlling interest—in operating subsidiaries and preferred unitholders	417	370	269
Non-controlling interest—Redeemable Partnership Units held by Brookfield	407	405	587
Net investment	1,012	1,011	1,492
GBP
Assets:
Current Assets	151	127	470
Non-Current Assets	4,431	3,739	3,927
Total assets	4,582	3,866	4,397
Liabilities:
Current Liabilities	414	262	434
Non-Current Liabilities	2,614	2,243	2,312
Total liabilities	3,028	2,505	2,746
Non-controlling interest—in operating subsidiaries and preferred unitholders	396	333	385
Non-controlling interest—Redeemable Partnership Units held by Brookfield	332	294	357
Net investment	826	734	909
BRL
Assets:
Current Assets	322	42	6
Non-Current Assets	8,184	1,895	1,020
Total assets	8,506	1,937	1,026
Liabilities:
Current Liabilities	73	23	0
Non-Current Liabilities	2,015	0	0
Total liabilities	2,088	23	0
Non-controlling interest—in operating subsidiaries and preferred unitholders	3,082	189	141
Non-controlling interest—Redeemable Partnership Units held by Brookfield	959	493	249
Net investment	2,377	1,232	636
CLP
Assets:
Current Assets	85	102	126
Non-Current Assets	1,117	1,070	1,052
Total assets	1,202	1,172	1,178
Liabilities:
Current Liabilities	59	50	30
Non-Current Liabilities	989	941	902
Total liabilities	1,048	991	932
Non-controlling interest—in operating subsidiaries and preferred unitholders	75	89	121
Non-controlling interest—Redeemable Partnership Units held by Brookfield	23	26	35
Net investment	56	66	90
CAD
Assets:
Current Assets	78	18	291
Non-Current Assets	814	677	636
Total assets	892	695	927
Liabilities:
Current Liabilities	55	35	122
Non-Current Liabilities	443	309	334
Total liabilities	498	344	456
Non-controlling interest—in operating subsidiaries and preferred unitholders	891	261	248
Non-controlling interest—Redeemable Partnership Units held by Brookfield	28	26	63
Net investment	(525)	64	160
EUR
Assets:
Current Assets	0	0	0
Non-Current Assets	836	718	618
Total assets	836	718	618
Liabilities:
Current Liabilities	0	0	0
Non-Current Liabilities	0	0	0
Total liabilities	0	0	0
Non-controlling interest—in operating subsidiaries and preferred unitholders	0	0	0
Non-controlling interest—Redeemable Partnership Units held by Brookfield	240	206	175
Net investment	596	512	443
COP
Assets:
Current Assets	68	55	46
Non-Current Assets	764	700	629
Total assets	832	755	675
Liabilities:
Current Liabilities	26	27	20
Non-Current Liabilities	438	369	342
Total liabilities	464	396	362
Non-controlling interest—in operating subsidiaries and preferred unitholders	302	294	256
Non-controlling interest—Redeemable Partnership Units held by Brookfield	19	19	16
Net investment	47	46	$ 41
PEN
Assets:
Current Assets	100	127
Non-Current Assets	1,356	1,260
Total assets	1,456	1,387
Liabilities:
Current Liabilities	18	27
Non-Current Liabilities	673	636
Total liabilities	691	663
Non-controlling interest—in operating subsidiaries and preferred unitholders	644	610
Non-controlling interest—Redeemable Partnership Units held by Brookfield	35	33
Net investment	86	81
INR
Assets:
Current Assets	57	52
Non-Current Assets	256	265
Total assets	313	317
Liabilities:
Current Liabilities	30	36
Non-Current Liabilities	185	186
Total liabilities	215	222
Non-controlling interest—in operating subsidiaries and preferred unitholders	60	58
Non-controlling interest—Redeemable Partnership Units held by Brookfield	11	11
Net investment	27	26
NZD
Assets:
Current Assets	17	46
Non-Current Assets	37	33
Total assets	54	79
Liabilities:
Current Liabilities	21	16
Non-Current Liabilities	6	32
Total liabilities	27	48
Non-controlling interest—in operating subsidiaries and preferred unitholders	1	23
Non-controlling interest—Redeemable Partnership Units held by Brookfield	8	3
Net investment	$ 18	$ 5

FINANCIAL RISK MANAGEMENT FI149

FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Sensitivity Analysis For Foreign Currency Risk (Details) - Foreign currency risk - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AUD
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	$ (18)	$ (2)	$ 8
Impact of 10% increase on Net income (loss)	18	2	(8)
Impact of 10% decrease on Partnership Capital	0	0	24
Impact of 10% increase on Partnership Capital	0	0	(24)
EUR
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	(9)	(8)	5
Impact of 10% increase on Net income (loss)	9	8	(5)
Impact of 10% decrease on Partnership Capital	0	35	18
Impact of 10% increase on Partnership Capital	0	(35)	(18)
GBP
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	(3)	(6)	5
Impact of 10% increase on Net income (loss)	3	6	(5)
Impact of 10% decrease on Partnership Capital	0	0	23
Impact of 10% increase on Partnership Capital	0	0	(23)
COP
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Partnership Capital	7	6	6
Impact of 10% increase on Partnership Capital	(7)	(6)	(6)
BRL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	21	14	0
Impact of 10% increase on Net income (loss)	(21)	(14)	0
Impact of 10% decrease on Partnership Capital	334	172	89
Impact of 10% increase on Partnership Capital	(334)	(172)	(89)
CLP
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	1	0	1
Impact of 10% increase on Net income (loss)	(1)	0	(1)
Impact of 10% decrease on Partnership Capital	8	10	13
Impact of 10% increase on Partnership Capital	(8)	(10)	(13)
CAD
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	(1)	(1)	1
Impact of 10% increase on Net income (loss)	1	1	(1)
Impact of 10% decrease on Partnership Capital	0	0	11
Impact of 10% increase on Partnership Capital	0	0	(11)
PEN
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	0	0	0
Impact of 10% increase on Net income (loss)	0	0	0
Impact of 10% decrease on Partnership Capital	12	11	0
Impact of 10% increase on Partnership Capital	(12)	(11)	0
INR
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10% decrease on Net income (loss)	0	0	0
Impact of 10% increase on Net income (loss)	0	0	0
Impact of 10% decrease on Partnership Capital	4	4	0
Impact of 10% increase on Partnership Capital	$ (4)	$ (4)	$ 0

CAPITAL MANAGEMENT - Invested C

CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Capital Management [Abstract]
Total partnership capital	$ 13,474	$ 9,644	$ 7,176	$ 6,322
Non-controlling interest - in operating subsidiaries	(5,875)	(2,771)
Deficit	1,366	697
Accumulated other comprehensive income	(1,257)	(1,074)
Ownership changes	(109)	(109)
Invested Capital	$ 7,599	$ 6,387	$ 5,452
Bottom of range
Disclosure of objectives, policies and processes for managing capital [line items]
Targeted returns on invested capital	12.00%
Top of range
Disclosure of objectives, policies and processes for managing capital [line items]
Targeted returns on invested capital	15.00%

CAPITAL MANAGEMENT Changes in I

CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in Invested capital [Roll Forward]
Opening balance	$ 6,387	$ 5,452
Issuance of preferred units	220	186	$ 189
Issuance of limited partnership units and redeemable partnership units	992	749
Ending balance	7,599	6,387	$ 5,452
Weighted Average Invested Capital	$ 6,885	$ 5,592

SUPPLEMENTAL CASH FLOW INFOR152

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flow Statement [Abstract]
Interest paid	$ 451	$ 366	$ 332
Income taxes paid	132	33	22
Changes in non-cash working capital
Accounts receivable	(31)	31	27
Prepayments and other	4	3	1
Accounts payable and other	158	11	(110)
Changes in non-cash working capital, net	$ 131	$ 45	$ (82)