Brookfield Infrastructure Partners (BIP) 6-K 13 Aug 18 2018 Q2 Current report (foreign) Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2018shares
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	6-K
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	276,785,243
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	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 782	$ 374
Financial assets	299	192
Accounts receivable and other	949	838
Inventory	105	108
Current assets	2,135	1,512
Property, plant and equipment	10,221	9,937
Intangible assets other than goodwill	8,868	9,894
Investments accounted for using equity method	4,407	5,572
Investment property	188	192
Goodwill	1,949	1,301
Non-current financial assets	730	730
Other non-current assets	260	273
Deferred tax assets	72	66
Assets	28,830	29,477
Liabilities
Accounts payable and other	1,026	864
Corporate borrowings	95	99
Current Non-recourse Borrowings And Current Portion of Non-current Non-recourse Borrowings	226	364
Financial liabilities	123	237
Current liabilities	1,470	1,564
Corporate borrowings	1,161	2,002
Non-current Portion Of Non-current Non-recourse Borrowings	9,463	7,699
Financial liabilities	1,085	1,076
Other liabilities	692	793
Deferred income tax liability	2,663	2,849
Preferred shares	20	20
Total liabilities	16,554	16,003
Partnership capital
Limited partners	4,545	4,967
General partner	22	25
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	1,832	2,012
Interest of others in operating subsidiaries	5,125	5,875
Preferred unitholders	752	595
Total partnership capital	12,276	13,474
Total liabilities and partnership capital	$ 28,830	$ 29,477

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATING RESULTS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Profit or loss [abstract]
Revenues	$ 1,044	$ 934	$ 2,057	$ 1,590
Direct operating costs	(467)	(373)	(876)	(716)
General and administrative expenses	(54)	(59)	(112)	(110)
Depreciation and amortization expense	(188)	(206)	(381)	(326)
Profit (loss) from operating activities	335	296	688	438
Interest expense	(125)	(107)	(239)	(201)
Share of profit (loss) of associates and joint ventures accounted for using equity method	1	36	(4)	59
Mark-to-market on hedging items	63	(29)	27	(66)
Gain (Loss) on Disposition of Business	0	0	338	0
Other income	17	(5)	(7)	19
Income before income tax	291	191	803	249
Income tax (expense) recovery
Current	(46)	(38)	(216)	(50)
Deferred	(26)	(18)	(41)	(18)
Net income	219	135	546	181
Attributable to:
Limited partners	64	(10)	186	(14)
General partner	34	28	69	56
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	27	(5)	79	(7)
Interest of others in operating subsidiaries	$ 94	$ 122	$ 212	$ 146
Basic and diluted (loss) earnings per unit attributable to:
Limited partners	$ 0.21	$ (0.06)	$ 0.63	$ (0.09)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of comprehensive income [abstract]
Net income	$ 219	$ 135	$ 546	$ 181
Items that will not be reclassified subsequently to profit or loss:
Marketable securities	4	2	(12)	2
Items that may be reclassified subsequently to profit or loss:
Foreign currency translation	(1,175)	(255)	(1,062)	(52)
Cash flow hedge	(29)	23	(58)	28
Net investment hedge	99	(76)	47	(197)
Taxes on the above items	2	(3)	5	2
Equity accounted investments	50	(26)	63	(52)
Other comprehensive income that will be reclassified to profit or loss, net of tax	(1,053)	(337)	(1,005)	(271)
Total other comprehensive income (loss)	(1,049)	(335)	(1,017)	(269)
Comprehensive income	(830)	(200)	(471)	(88)
Attributable to:
Limited partners	(299)	(121)	(161)	(133)
General partner	32	27	67	55
Non-controlling interest attributable to:
Redeemable Partnership Units held by Brookfield	(125)	(51)	(68)	(57)
Interest of others in operating subsidiaries	$ (438)	$ (55)	$ (309)	$ 47

CONSOLIDATED STATEMENTS OF PART

CONSOLIDATED STATEMENTS OF PARTNERSHIP CAPITAL - USD ($) $ in Millions	Total	Non-controlling Interest—In Operating Subsidiaries [Member]	Preferred Unitholders Capital [Member]	Limited Partners 1 [Member]	Limited Partners 1 [Member]Issued capital [member]	Limited Partners 1 [Member]Retained earnings [member]	Limited Partners 1 [Member]Ownership Changes [Member]	Limited Partners 1 [Member]Accumulated other comprehensive income [member]	General Partner 1 [Member]	General Partner 1 [Member]Issued capital [member]	General Partner 1 [Member]Retained earnings [member]	General Partner 1 [Member]Accumulated other comprehensive income [member]	Non-controlling Interest - Redeemable Partnership Units [Member]	Non-controlling Interest - Redeemable Partnership Units [Member]Issued capital [member]	Non-controlling Interest - Redeemable Partnership Units [Member]Retained earnings [member]	Non-controlling Interest - Redeemable Partnership Units [Member]Ownership Changes [Member]	Non-controlling Interest - Redeemable Partnership Units [Member]Accumulated other comprehensive income [member]
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
Net income	181	146		(14)		(14)			56		56		(7)		(7)
Other comprehensive income	(269)	(99)		(119)				(119)	(1)			(1)	(50)				(50)
Comprehensive income	(88)	47		(133)		(14)		(119)	55		56	(1)	(57)		(7)		(50)
Issue of equity	11			11	11
Dividends recognised as distributions to owners	(376)		14	(226)		(226)			(56)		(56)		(94)		(94)
Dividends, Preferred Stock, Cash1	(14)			(10)		(10)							(4)		(4)
Increase (decrease) through acquisition of subsidiary, equity	3,429	3,429
Decrease From Subsidiary Distributions To Non-controlling Interest	(202)	(202)
Preferred Unit, Issue Of Equity	220		220
Balance as at Jun. 30, 2017	12,624	6,045	595	4,253	4,226	(733)	143	617	26	19	1	6	1,705	1,778	(320)	(34)	281
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
Issue of equity					692									300
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
Balance as at Mar. 31, 2017	9,774	2,859	595	4,488	4,221	(604)	143	728	27	19	1	7	1,805	1,778	(266)	(34)	327
Net income	135	122		(10)		(10)			28		28		(5)		(5)
Other comprehensive income	(335)	(177)		(111)				(111)	(1)			(1)	(46)				(46)
Comprehensive income	(200)	(55)		(121)		(10)		(111)	27		28	(1)	(51)		(5)		(46)
Issue of equity	5			5	5
Dividends recognised as distributions to owners	(188)		8	(113)		(113)			(28)		(28)		(47)		(47)
Dividends, Preferred Stock, Cash1	(8)			(6)		(6)							(2)		(2)
Increase (decrease) through acquisition of subsidiary, equity	3,429	3,429
Decrease From Subsidiary Distributions To Non-controlling Interest	(188)	(188)
Preferred Unit, Issue Of Equity	0
Balance as at Jun. 30, 2017	12,624	6,045	595	4,253	4,226	(733)	143	617	26	19	1	6	1,705	1,778	(320)	(34)	281
Cumulative Effect of New Accounting Principle in Period of Adoption	16	10		4		4							2		2
Equity, Adjusted Balance, Total	13,490	5,885	595	4,971	4,907	(949)	149	864	25	19		6	2,014	2,078	(411)	(40)	387
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
Net income	546	212		186		186			69		69		79		79
Other comprehensive income	(1,017)	(521)		(347)				(347)	(2)			(2)	(147)				(147)
Comprehensive income	(471)	(309)		(161)		186		(347)	67		69	(2)	(68)		79		(147)
Issue of equity	8			8	8									0
Dividends recognised as distributions to owners	(438)		19	(260)		(260)			(70)		(70)		(108)		(108)
Dividends, Preferred Stock, Cash1	(19)			(13)		(13)							(6)		(6)
Increase (decrease) through acquisition of subsidiary, equity	759	759
Decrease From Subsidiary Distributions To Non-controlling Interest	(333)	(333)
Decrease From Subsidiary Returns of Capital To Non-controlling Interest	(877)	(877)
Preferred Unit, Issue Of Equity	157		157
Increase (decrease) through other changes, equity	0					450		(450)			3	(3)			188		(188)
Balance as at Jun. 30, 2018	12,276	5,125	752	4,545	4,915	(586)	149	67	22	19	2	1	1,832	2,078	(258)	(40)	52
Balance as at Mar. 31, 2018	13,607	5,839	752	4,977	4,911	(513)	149	430	25	19	3	3	2,014	2,078	(228)	(40)	204
Net income	219	94		64		64			34		34		27		27
Other comprehensive income	(1,049)	(532)		(363)				(363)	(2)			(2)	(152)		0		(152)
Comprehensive income	(830)	(438)		(299)		64		(363)	32		34	(2)	(125)		27		(152)
Issue of equity	4			4	4										0
Dividends recognised as distributions to owners	(219)		10	(130)		(130)			(35)		(35)		(54)		(54)
Dividends, Preferred Stock, Cash1	(10)			(7)		(7)							(3)		(3)
Increase (decrease) through acquisition of subsidiary, equity	759	759
Decrease From Subsidiary Distributions To Non-controlling Interest	(158)	(158)
Decrease From Subsidiary Returns of Capital To Non-controlling Interest	(877)	(877)
Preferred Unit, Issue Of Equity	0
Balance as at Jun. 30, 2018	$ 12,276	$ 5,125	$ 752	$ 4,545	$ 4,915	$ (586)	$ 149	$ 67	$ 22	$ 19	$ 2	$ 1	$ 1,832	$ 2,078	$ (258)	$ (40)	$ 52

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 219	$ 135	$ 546	$ 181
Adjusted for the following items:
Earnings from investments in associates and joint ventures, net of distributions received	15	(16)	24	(21)
Depreciation and amortization expense	188	206	381	326
Mark-to-market on hedging items, provisions and other	(40)	54	29	75
Gain (Loss) on Disposition of Business	0	0	(338)	0
Deferred income tax expense (recovery)	26	18	41	18
Changes in non-cash working capital, net	(225)	22	(34)	18
Cash from operating activities	183	419	649	597
Investing Activities
Acquisition of subsidiaries, net of cash acquired	(398)	(4,203)	(398)	(4,203)
Additions of investments in associates and joint ventures	(40)	(269)	(55)	(318)
Proceeds from sales of investments accounted for using equity method	0	0	1,289	0
Purchase of long lived assets	(180)	(176)	(358)	(351)
Disposal of long lived assets	2	0	5	41
Purchase of financial assets	(77)	(76)	(140)	(219)
Sale of financial assets and other	14	148	52	195
Net settlement of foreign exchange hedging items	(18)	(10)	(72)	(40)
Cash used by investing activities	(697)	(4,586)	323	(4,895)
Financing Activities
Distributions to general partner	(35)	(28)	(70)	(56)
Distributions to other unitholders	(194)	(168)	(387)	(334)
Subsidiary distributions to non-controlling interest	(158)	(188)	(333)	(202)
Capital provided by non-controlling interest	146	2,817	146	2,817
Capital provided to non-controlling interest	(877)	0	(877)	0
Proceeds from corporate borrowings	0	309	0	537
Proceeds from corporate credit facility	62	792	669	1,253
Repayment of corporate credit facility	(62)	(473)	(1,458)	(479)
Proceeds from subsidiary borrowings	1,816	325	2,684	341
Repayment of subsidiary borrowings	(262)	(75)	(1,070)	(132)
Preferred units issued	0	0	157	220
Partnership units issued, net of issuance costs	4	5	8	11
Cash from financing activities	440	3,316	(531)	3,976
Cash and cash equivalents
Change during the year	(74)	(851)	441	(322)
Impact of foreign exchange on cash	(34)	(4)	(33)	4
Balance, beginning of year	890	1,323	374	786
Balance, end of year	$ 782	$ 468	$ 782	$ 468

ORGANIZATION AND DESCRIPTION OF

ORGANIZATION AND DESCRIPTION OF THE BUSINESS	6 Months Ended
	Jun. 30, 2018
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 utilities, transport, energy and data 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 interim condensed and 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 “Series 5 Preferred Units”, “Series 7 Preferred Units”, and “Series 9 Preferred Units” are to 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.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2018
Corporate Information And Statement Of IFRS Compliance [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF ACCOUNTING POLICIES a) Statement of compliance These interim condensed and consolidated financial statements of our partnership and its subsidiaries (together “Brookfield Infrastructure”) have been prepared in accordance with International Accounting Standard 34, Interim Financial Reporting , (“IAS 34”) as issued by the International Accounting Standards Board (“IASB”) and using the accounting policies Brookfield Infrastructure applied in its consolidated financial statements as of and for the year ended December 31, 2017 , amended by the recently adopted accounting standards described in the section below. The accounting policies that our partnership applied in its annual consolidated financial statements as of and for the year ended December 31, 2017 are disclosed in Note 3 of such financial statements, with which reference should be made in reading these interim condensed and consolidated financial statements. These interim condensed and consolidated financial statements were authorized for issuance by the Board of Directors of our partnership on August 13, 2018 . b) Recently adopted accounting standard amendments Brookfield Infrastructure applied, for the first time, certain new standards applicable to our partnership that became effective January 1, 2018. The impact of adopting these new standards on our partnership’s accounting policies are as follows: IFRS 15 Revenue from Contracts with Customers (“IFRS 15”) IFRS 15 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. Our partnership adopted the standard on January 1, 2018, on a modified retrospective basis. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Apart from additional disclosure requirements, the adoption did not have a significant impact on the partnership’s condensed and consolidated financial statements and therefore has not been included in the “ Cumulative effect of changes ” section below. 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 each contains a single performance obligation that is recognized over time. The connection revenue relating to Brookfield Infrastructure’s regulated distribution operation contains a distinct performance obligation that is recognized over the period that the connection is constructed, based on an input method of progress recognition on the basis that this methodology is most reflective of the underlying transfer of control. Terminal infrastructure revenue contains both a capacity charge and a handling charge associated with operating the terminal. The terminal infrastructure service contracts contain a performance obligation recognized over time pertaining to capacity for the period the services are provided and for handling service based on tons of coal shipped through the terminal when service is provided. The payment terms for all of our businesses in the utilities segment require payment upon completion, except for connections income whereby payment is typically collected up-front prior to the completion of any services. Transport Revenue from transport infrastructure consists primarily of freight, toll road operations and transportation services revenue. These services consist of a single performance obligation and revenue is recognized over time when services are rendered, based primarily on usage or volume during the period. The payment terms for all of our businesses in the transport segment require payment upon completion of the underlying transportation service. Energy Revenue from energy infrastructure consists primarily of energy transmission and storage as well as district energy services. Energy transmission services revenue consists of a single performance obligation and is recognized over time as services are rendered, based primarily on usage or volume throughput. Performance obligations relating to district energy contracts are satisfied over time as the services are rendered. Gas storage revenues contain both a capacity charge and a variable charge, however the associated services are highly interdependent and represent a single performance obligation that is satisfied over time as the services are provided. The payment terms for all of our businesses in the energy segment require payment upon completion of the underlying service within a given period. Data Infrastructure Revenue from data infrastructure is derived from contracts with media broadcasting and telecom customers to access infrastructure. These contracts consist of performance obligations that are satisfied over time in accordance with the underlying agreements. The payment terms for our businesses in the data infrastructure segment require upfront and recurring payments to lease space on towers to host the customers’ equipment. The differing payment terms do not constitute separate performance obligations as revenue is recognized over time for the period the services are provided. IFRS 9 Financial Instruments (“IFRS 9”) 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. The standard includes changes regarding the classification of certain financial instruments as outlined in the table below. These changes have not had a material impact on our partnership’s consolidated financial statements. The standard also includes a new general hedge accounting standard which aligns 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 allows 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. Our partnership has adopted the standards as of January 1, 2018 retrospectively with no restatement of comparative periods. Certain hedge accounting relationships relating to aggregated foreign currency exposures now qualify for hedge accounting under this new standard. Consequently, the partnership has applied 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. A cumulative catch-up adjustment has been recorded through equity upon initial adoption. Financial Instrument Classification Our partnership classifies cash and cash equivalents and accounts receivable and other as amortized cost. Additionally, our partnership maintains a portfolio of marketable securities comprised of liquid equity and debt securities. The marketable securities are classified either as fair value through other comprehensive income (“FVTOCI”) or fair value through profit or loss (“FVTPL”). Derivative assets are classified as FVTPL, except for derivatives in certain hedging relationships. Other financial assets are classified as either amortized cost or FVTOCI. Financial assets classified as FVTPL or FVTOCI are subsequently measured at fair value at each reporting date. For financial assets classified as FVTPL, the change in fair value is recorded through profit or loss. For financial assets classified as FVTOCI, the change in fair value is recorded in other comprehensive income. The cumulative gains or losses related to FVTOCI equity instruments are not reclassified to profit or loss on disposal, whereas the cumulative gains or losses on all other FVTOCI assets are reclassified to profit or loss on disposal. For financial instruments at amortized cost or debt instruments at FVTOCI, the partnership assesses if there have been significant increases in credit risk since initial recognition to determine whether lifetime or 12-month expected credit losses should be recognized. Any related loss allowances are recorded through profit or loss. Borrowings, accounts payable and other, and preferred shares are classified as amortized cost, except for derivatives embedded in related financial instruments. Embedded derivatives and any other derivative liabilities are classified as FVTPL and are subsequently measured at fair value, except for derivatives in certain hedging relationships. Other financial liabilities are classified as either FVTPL or amortized cost. Financial instruments classified as amortized cost upon adoption of IFRS 9 were previously classified as loans and receivables. Financial assets classified as FVTOCI and certain marketable securities classified as FVTPL were previously classified as available-for-sale securities. The changes in classification had no impact on the carrying values and there were no changes to the classification of the remainder of financial assets classified as FVTPL. Hedge Accounting 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 that the hedging relationship meets all of the hedge effectiveness requirements. 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. 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. IFRIC 22 Foreign Currency Transactions (“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 partnership has adopted the standard as of January 1, 2018 prospectively. The adoption did not have a significant impact on the partnership’s condensed and consolidated financial statements. c) Cumulative effect of changes The changes made to our January 1, 2018 condensed and consolidated statement of financial position for the adoption of IFRS 9 was driven by our North American gas storage business, which elected to account for certain physical commodity contracts as financial instruments under IFRS 9. This election resulted in the recognition of the fair values of the contracts as financial assets or financial liabilities and the cumulative mark-to-market gains directly in partnership capital. The impacts of this election were increases of $25 million , $9 million and $16 million in total assets, total liabilities and total partnership capital, respectively. The adoption of all other accounting standards did not have an impact to our January 1, 2018 assets, liabilities or partnership capital. d) Standards issued but not yet adopted IFRS 16 Leases ( “ IFRS 16 ” ) In January 2016, the IASB published a new standard, IFRS 16, Leases (“IFRS 16”). The new standard brings most leases on balance sheet, 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. Our partnership continues to evaluate the overall impact of IFRS 16 on its consolidated financial statements. Our partnership has participated in strategic planning sessions with its subsidiaries and associates in order to provide guidance regarding the key considerations and to develop an adoption project plan. Our partnership is completing its assessment of existing contractual arrangements to identify the existing population of lease arrangements that would be capitalized under the new standard. Next steps include performing an initial quantification of the impact, assessing any potential impact to IT systems and internal controls and reviewing the additional disclosures required by the new standard. IFRS 16 can either be adopted on a full retrospective method or on a modified retrospective method whereby any transitional impact is recorded in equity as at January 1, 2019 and comparative periods are not restated. Our partnership has tentatively determined that the modified retrospective approach will be adopted and we are currently in the process of evaluating a number of practical expedients available under the new standard. e) Interpretations issued but not yet adopted 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.

SEGMENT INFORMATION

SEGMENT INFORMATION	6 Months Ended
	Jun. 30, 2018
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 assess 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. Total attributable to Brookfield Infrastructure FOR THE THREE-MONTH PERIOD ENDED Utilities Transport Energy Data (1) Corporate Total Contribution Attributable As per (2) Revenues $ 245 $ 410 $ 137 $ 45 $ — $ 837 $ (368 ) $ 575 $ 1,044 Costs attributed to revenues (68 ) (237 ) (68 ) (22 ) — (395 ) 211 (283 ) (467 ) General and administrative costs — — — — (54 ) (54 ) — — (54 ) Adjusted EBITDA 177 173 69 23 (54 ) 388 (157 ) 292 Other (expense) income (8 ) — 3 (1 ) 16 10 4 (26 ) (12 ) Interest expense (30 ) (40 ) (18 ) (3 ) (13 ) (104 ) 30 (51 ) (125 ) FFO 139 133 54 19 (51 ) 294 (123 ) 215 Depreciation and amortization (43 ) (85 ) (38 ) (17 ) — (183 ) 91 (96 ) (188 ) Deferred taxes (12 ) (1 ) (1 ) — 1 (13 ) (3 ) (10 ) (26 ) Mark-to-market on hedging items and other (10 ) (23 ) (20 ) 1 79 27 34 (15 ) 46 Share of earnings from associates — — — — — — 1 — 1 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (94 ) (94 ) Net income (loss) attributable to partnership (3) $ 74 $ 24 $ (5 ) $ 3 $ 29 $ 125 $ — $ — $ 125 Total attributable to Brookfield Infrastructure FOR THE THREE-MONTH PERIOD ENDED Utilities Transport Energy Data (1) Corporate Total Contribution Attributable to non-controlling As per IFRS (2) Revenues $ 278 $ 395 $ 123 $ 41 $ — $ 837 $ (408 ) $ 505 $ 934 Costs attributed to revenues (73 ) (224 ) (60 ) (18 ) — (375 ) 220 (218 ) (373 ) General and administrative costs — — — — (59 ) (59 ) — — (59 ) Adjusted EBITDA 205 171 63 23 (59 ) 403 (188 ) 287 Other (expense) income (8 ) 1 3 (1 ) 7 2 1 (16 ) (13 ) Interest expense (29 ) (38 ) (23 ) (3 ) (17 ) (110 ) 44 (41 ) (107 ) FFO 168 134 43 19 (69 ) 295 (143 ) 230 Depreciation and amortization (57 ) (75 ) (35 ) (19 ) — (186 ) 91 (111 ) (206 ) Deferred taxes (12 ) 2 5 3 (3 ) (5 ) (3 ) (10 ) (18 ) Mark-to-market on hedging items and other (12 ) (18 ) (12 ) (1 ) (48 ) (91 ) 19 13 (59 ) Share of earnings from associates — — — — — — 36 — 36 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (122 ) (122 ) Net income (loss) attributable to partnership (3) $ 87 $ 43 $ 1 $ 2 $ (120 ) $ 13 $ — $ — $ 13 Total attributable to Brookfield Infrastructure FOR THE SIX-MONTH PERIOD ENDED Utilities Transport Energy Data Infrastructure (1) Corporate Total Contribution from investments in associates Attributable to non-controlling interest As per IFRS financials (2) Revenues $ 517 $ 834 $ 290 $ 88 $ — $ 1,729 $ (791 ) $ 1,119 $ 2,057 Costs attributed to revenues (137 ) (483 ) (142 ) (42 ) — (804 ) 431 (503 ) (876 ) General and administrative costs — — — — (112 ) (112 ) — — (112 ) Adjusted EBITDA 380 351 148 46 (112 ) 813 (360 ) 616 Other (expense) income (11 ) 2 8 (2 ) 33 30 4 (51 ) (17 ) Interest expense (61 ) (83 ) (36 ) (6 ) (30 ) (216 ) 72 (95 ) (239 ) FFO 308 270 120 38 (109 ) 627 (284 ) 470 Depreciation and amortization (101 ) (184 ) (71 ) (37 ) — (393 ) 202 (190 ) (381 ) Deferred taxes (27 ) 12 (3 ) 2 1 (15 ) (12 ) (14 ) (41 ) Mark-to-market on hedging items and other (57 ) (62 ) (38 ) 1 (67 ) (223 ) 98 (54 ) (179 ) Gain on sale of associates — — — — 338 338 — — 338 Share of losses from associates — — — — — — (4 ) — (4 ) Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (212 ) (212 ) Net income attributable to partnership (3) $ 123 $ 36 $ 8 $ 4 $ 163 $ 334 $ — $ — $ 334 Total attributable to Brookfield Infrastructure FOR THE SIX-MONTH PERIOD ENDED Utilities Transport Energy Data Infrastructure (1) Corporate Total Contribution from investments in associates Attributable to non-controlling interest As per IFRS financials (2) Revenues $ 454 $ 770 $ 265 $ 80 $ — $ 1,569 $ (788 ) $ 809 $ 1,590 Costs attributed to revenues (121 ) (434 ) (116 ) (35 ) — (706 ) 411 (421 ) (716 ) General and administrative costs — — — — (110 ) (110 ) — — (110 ) Adjusted EBITDA 333 336 149 45 (110 ) 753 (377 ) 388 Other (expense) income (7 ) (2 ) 6 (1 ) 27 23 7 (16 ) 14 Interest expense (58 ) (77 ) (50 ) (6 ) (29 ) (220 ) 93 (74 ) (201 ) FFO 268 257 105 38 (112 ) 556 (277 ) 298 Depreciation and amortization (89 ) (151 ) (68 ) (36 ) — (344 ) 179 (161 ) (326 ) Deferred taxes (18 ) 7 — 5 (2 ) (8 ) (1 ) (9 ) (18 ) Mark-to-market on hedging items and other (28 ) (39 ) (19 ) (2 ) (81 ) (169 ) 40 18 (111 ) Share of earnings from associates — — — — — — 59 — 59 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (146 ) (146 ) Net income (loss) attributable to partnership (3) $ 133 $ 74 $ 18 $ 5 $ (195 ) $ 35 $ — $ — $ 35 1. During the second quarter of 2018, our Communications Infrastructure segment was renamed to Data Infrastructure. There was no concurrent change in the operations which comprise the segment. 2. 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. 3. 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 periods under review: Total Attributable to Brookfield Infrastructure AS OF JUNE 30, 2018 Utilities Transport Energy Data Infrastructure Corporate Total Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials (1) US$ MILLIONS Total assets $ 4,828 $ 6,457 $ 3,104 $ 1,072 $ (781 ) $ 14,680 $ (2,391 ) $ 12,115 $ 4,426 $ 28,830 Total Attributable to Brookfield Infrastructure AS OF DECEMBER 31, 2017 Utilities Transport Energy Data Infrastructure Corporate Total Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials (1) US$ MILLIONS Total assets $ 6,542 $ 6,990 $ 3,134 $ 1,049 $ (1,083 ) $ 16,632 $ (3,134 ) $ 11,668 $ 4,311 $ 29,477 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.

DISPOSITION OF CHILEAN ELECTRIC

DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION	6 Months Ended
	Jun. 30, 2018
Disclosure of interests in other entities [Abstract]
INVESTMENT IN ASSOCIATES AND JOINT VENTURES	DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION On March 15, 2018, Brookfield Infrastructure sold its 27.8% interest in a Chilean electricity transmission operation, ETC Transmission Holdings, S.L. (ETC Holdings), the parent company of Transelec S.A. The Chilean electricity transmission operation was previously included in the utilities operating segment and was sold to a third party for proceeds of $1.3 billion . After recognizing our share of earnings and foreign currency translation until March 15, 2018, the partnership’s carrying value of ETC Holdings was $951 million . On disposition of the business, the partnership recognized a gain of $338 million in the Consolidated Statement of Operating Results, net of transaction costs of $11 million , along with the associated income tax expense of $129 million . As a result of the disposition, accumulated revaluation surplus of $641 million (net of tax) was reclassified from accumulated other comprehensive income directly to retained earnings and recorded within Other items on the Consolidated Statements of Partnership Capital. Accumulated other comprehensive losses of $35 million were reclassified to share of earnings (losses) from associates and joint ventures on the Consolidated Statement of Operating Results.

ACQUISITION OF BUSINESSES

ACQUISITION OF BUSINESSES	6 Months Ended
	Jun. 30, 2018
Disclosure of detailed information about business combination [abstract]
ACQUISITION OF BUSINESSES	ACQUISITION OF BUSINESSES a) Acquisition of Colombian natural gas distribution business On June 1, 2018, Brookfield Infrastructure, alongside institutional partners (the “GN consortium”), acquired an effective 16% interest in Gas Natural, S.A. ESP (“GN”), a Colombian natural gas distribution business, for total consideration by Brookfield Infrastructure of $150 million (GN consortium total of $522 million ). The acquisition was funded through equity of $ 88 million (GN consortium total of $309 million ) and the remainder with asset level debt raised concurrently on closing. 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 1, 2018. Acquisition costs of $2 million were recorded as Other expenses within the Consolidated Statements of Operating Results in the second quarter of 2018. Consideration transferred US$ MILLIONS Cash $ 118 Pre-existing interest of GN (1) 32 Total Consideration $ 150 1. Brookfield Infrastructure acquired a 3% interest in GN in December 2017, which had a fair market value of $32 million as at the date of acquisition. No gain or loss resulted from this acquisition. Fair value of assets and liabilities acquired as of June 1, 2018 (provisional) (1) : US$ MILLIONS Cash and cash equivalents $ 21 Accounts receivable and other 275 Property, plant and equipment 487 Intangible assets 17 Goodwill 770 Accounts payable and other liabilities (238 ) Deferred income tax liabilities (83 ) Non-recourse borrowings (185 ) Net assets acquired before non-controlling interest 1,064 Non-controlling interest (2),(3) (914 ) Net assets acquired $ 150 1. The fair values of all acquired assets and liabilities for this operation have been determined on a provisional basis given the proximity of the acquisition to the reporting date, pending finalization of the determination of the fair values of the acquired net assets. Our partnership is in the process of obtaining additional information in order to assess the fair value of property, plant and equipment, intangible assets and provisions as at the date of acquisition. Our partnership has engaged a third party valuation company to support management’s assessment of the fair value. 2. Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value as at the acquisition date based on the enterprise value of the business as per the underwriting model. 3. Non-controlling interest includes an investment funded with asset level debt raised concurrently on closing. Upon acquisition of an interest in GN, an additional deferred tax liability of $76 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 gave rise to goodwill of $76 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. The goodwill recorded on acquisition is largely reflective of potential customer growth and growth under existing contracts arising from the business’ position as a key distributor of natural gas in various markets of Colombia. None of the goodwill recognized is deductible for income tax purposes. Had the acquisition of the Colombian natural gas distribution business been effective January 1, 2018, the revenue and net income of Brookfield Infrastructure would have been $2,457 million and $571 million , respectively, for the six-month period ended June 30, 2018 . b) Acquisition of Brazilian regulated gas transmission business On April 4, 2017, Brookfield Infrastructure, alongside institutional partners (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 $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 $8 million were recorded as Other expenses within the Consolidated Statements of Operating Results in 2017. Consideration transferred US$ MILLIONS Cash $ 1,306 Consideration payable (1) 262 Total Consideration $ 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. 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 (1) 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 (2) (4,009 ) Net assets acquired $ 1,568 1. Represents authorizations that expire between 2039 and 2041. 2. 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 gave rise to goodwill of $804 million , which is recoverable so long as the tax circumstances that gave rise to the goodwill do not change. To date, no such changes have occurred. None of the goodwill recognized is deductible for income tax purposes. c) Individually insignificant business combinations The following table summarizes the purchase price allocation of individually insignificant business combinations that were completed in 2017. US$ MILLIONS Cash $ 9 Consideration payable 21 Total consideration $ 30 Fair value of assets and liabilities acquired: US$ MILLIONS Accounts receivable and other $ 28 Goodwill 14 Property, plant and equipment 104 Deferred income tax and other liabilities (30 ) Non-recourse borrowings (30 ) Net assets acquired before non-controlling interest 86 Non-controlling interest (1) (56 ) Net assets acquired $ 30 1. Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	6 Months Ended
	Jun. 30, 2018
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 Interim Condensed and 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 securities designated as fair value through other comprehensive income are recognized in other comprehensive income. Carrying Value and Fair Value of Financial Instruments The following table provides the allocation of financial instruments and their associated classifications as at June 30, 2018 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total Financial assets Cash and cash equivalents $ — $ — $ 782 $ 782 Accounts receivable and other — — 949 949 Financial assets (current and non-current) (1) 668 34 136 838 Marketable securities 143 48 — 191 Total $ 811 $ 82 $ 1,867 $ 2,760 Financial liabilities Corporate borrowings $ — $ — $ 1,256 $ 1,256 Non-recourse borrowings (current and non-current) — — 9,689 9,689 Accounts payable and other — — 1,026 1,026 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 309 — 899 1,208 Total $ 309 $ — $ 12,890 $ 13,199 1. Derivative instruments which are elected for hedge accounting totaling $522 million are included in financial assets and $54 million of derivative instruments are included in financial liabilities. 2. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the allocation of financial instruments and their associated classifications as at December 31, 2017 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total 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. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the carrying values and fair values of financial instruments as at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial assets Cash and cash equivalents $ 782 $ 782 $ 374 $ 374 Accounts receivable and other 949 949 838 838 Financial assets (current and non-current) 838 838 837 837 Marketable securities 191 191 85 85 Total $ 2,760 $ 2,760 $ 2,134 $ 2,134 Financial liabilities Corporate borrowings (1) $ 1,256 $ 1,261 $ 2,101 $ 2,113 Non-recourse borrowings (2) 9,689 9,978 8,063 8,392 Accounts payable and other (current and non-current) 1,026 1,026 864 864 Preferred shares (3) 20 20 20 20 Financial liabilities (current and non-current) 1,208 1,208 1,313 1,313 Total $ 13,199 $ 13,493 $ 12,361 $ 12,702 1. Corporate borrowings are 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 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 designated as a hedge of a specific exposure and the hedging relationship must meet all of the hedge effectiveness requirements 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 hedging relationship does not meet all of the hedge effectiveness requirements, 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 probable forecasted 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 three and six -month periods ended June 30, 2018, pre-tax net unrealized losses of $29 million and $58 million , respectively, ( 2017 : gains of $23 million and $28 million ) were recorded in other comprehensive income for the effective portion of the cash flow hedges. As of June 30, 2018 , there was a net derivative asset balance of $456 million relating to derivative contracts designated as cash flow hedges (December 31, 2017: $447 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 three and six -month periods ended June 30, 2018, gains of $99 million and $47 million , respectively, (2017: losses of $76 million and $197 million ) were recorded in other comprehensive income relating to the effective portion of hedges of net investments in foreign operations. Further, for the three and six -month periods ended June 30, 2018, Brookfield Infrastructure paid $18 million and $72 million , respectively, ( 2017 : $10 million and $40 million ) relating to the settlement of foreign exchange contracts in the period. Consistent with our risk management objectives, these contracts are replaced at expiration; therefore, no reclassification to profit or loss has been recorded during the period. As of June 30, 2018 , there was a net unrealized derivative asset balance of $12 million relating to derivative contracts designated as net investment hedges (December 31, 2017: net unrealized derivative liability balance of $129 million ). Fair Value Hierarchical Levels—Financial Instruments Fair value hierarchical levels are directly determined by the amount of subjectivity associated with the valuation inputs of these assets and liabilities, and are as follows: • Level 1 – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. • Level 2 – Inputs other than quoted prices included in Level 1 are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Fair valued assets and liabilities that are included in this category are primarily certain derivative contracts and other financial assets carried at fair value in an inactive market. • Level 3 – Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to determining the estimate. Fair valued assets and liabilities that are included in this category are interest rate swap contracts, derivative contracts, certain equity securities carried at fair value which are not traded in an active market and the non-controlling interest’s share of net assets of limited life funds. The fair value of our partnership’s financial assets and financial liabilities are measured at fair value on a recurring basis. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s financial assets and financial liabilities: US$ MILLIONS Fair value hierarchy June 30, 2018 December 31, 2017 Marketable securities Level 1 (1) $ 191 $ 85 Foreign currency forward contracts Level 2 (2) Financial asset $ 305 $ 236 Financial liability 46 196 Interest rate swaps & other Level 2 (2) Financial asset $ 348 $ 381 Financial liability 161 155 Other contracts Level 3 (3) Financial asset $ 49 $ 48 Financial liability 102 89 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 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 $893 million ( 2017 : $750 million ) of financial assets and $309 million ( 2017 : $440 million ) of financial liabilities which are measured at fair value using valuation inputs based on management’s best estimates. During the three-month period ended June 30, 2018 , no transfers were made between level 1 and 2 or level 2 and 3. The following table categorizes financial assets and liabilities, which are carried at fair value, based upon the level of input. June 30, 2018 December 31, 2017 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 191 $ — $ — $ 85 $ — $ — Financial assets (current and non-current) — 653 49 — 617 48 Financial liabilities Financial liabilities (current and non-current) $ — $ 207 $ 102 $ — $ 351 $ 89

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	6 Months Ended
	Jun. 30, 2018
Property, plant and equipment [abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT US$ MILLIONS Utilities Assets Transport Assets Energy Assets Total Assets Gross Carrying Amount: Balance at January 1, 2017 $ 2,895 $ 2,362 $ 2,380 $ 7,637 Additions, net of disposals 349 104 95 548 Non-cash (disposals), net of additions — — (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 Additions, net of disposals 230 28 48 306 Acquisitions through business combinations (1) 487 — — 487 Non-cash (disposals), net of additions (23 ) (21 ) — (44 ) Net foreign currency exchange differences (86 ) (130 ) (48 ) (264 ) Balance at June 30, 2018 $ 4,079 $ 2,534 $ 2,629 $ 9,242 Accumulated depreciation: Balance at January 1, 2017 $ (383 ) $ (517 ) $ (258 ) $ (1,158 ) Depreciation expense (118 ) (147 ) (117 ) (382 ) Non-cash disposals 19 21 — 40 Disposals — — 5 5 Net foreign currency exchange differences (28 ) (44 ) (13 ) (85 ) Balance at December 31, 2017 $ (510 ) $ (687 ) $ (383 ) $ (1,580 ) Depreciation expense (70 ) (73 ) (65 ) (208 ) Disposals 2 13 — 15 Net foreign currency exchange differences 6 35 8 49 Balance at June 30, 2018 $ (572 ) $ (712 ) $ (440 ) $ (1,724 ) Accumulated fair value adjustments: Balance at January 1, 2017 $ 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 foreign currency exchange differences (2 ) (43 ) (12 ) (57 ) Balance at June 30, 2018 $ 1,256 $ 830 $ 617 $ 2,703 Net book value: December 31, 2017 $ 4,219 $ 2,843 $ 2,875 $ 9,937 June 30, 2018 $ 4,763 $ 2,652 $ 2,806 $ 10,221 1. Refer to Note 5 Acquisition of Businesses.

INTANGIBLE ASSETS

INTANGIBLE ASSETS	6 Months Ended
	Jun. 30, 2018
Intangible Assets [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS As of US$ MILLIONS June 30, 2018 December 31, 2017 Cost $ 9,555 $ 10,470 Accumulated amortization (687 ) (576 ) Total $ 8,868 $ 9,894 Intangible assets are allocated to the following cash generating units: As of US$ MILLIONS June 30, 2018 December 31, 2017 Brazilian regulated gas transmission operation $ 4,314 $ 5,134 Australian regulated terminal 1,852 1,957 Peruvian toll roads 1,137 1,144 Chilean toll roads 1,010 1,100 U.K. port operation 283 289 Indian toll roads 114 130 Other (1) 158 140 Total $ 8,868 $ 9,894 1. Other intangibles are comprised of customer contracts at our Australian ports operations and contracted order book at our U.K. regulated distribution operation. The following table presents the change in the cost balance of intangible assets: For the six-month US$ MILLIONS 2018 2017 Cost at beginning of the period $ 10,470 $ 4,732 Additions through business combinations 17 5,539 Additions, net of disposals 32 46 Foreign currency translation (964 ) (25 ) Ending Balance $ 9,555 $ 10,292 The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets: For the six-month US$ MILLIONS 2018 2017 Accumulated amortization at beginning of the period $ (576 ) $ (267 ) Disposals — 1 Amortization (173 ) (143 ) Foreign currency translation 62 (9 ) Ending Balance $ (687 ) $ (418 )

INVESTMENT IN ASSOCIATES AND JO

INVESTMENT IN ASSOCIATES AND JOINT VENTURES	6 Months Ended
	Jun. 30, 2018
Interests In Other Entities [Abstract]
INVESTMENT IN ASSOCIATES AND JOINT VENTURES	INVESTMENT IN ASSOCIATES AND JOINT VENTURES The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS For the six-month period ended June 30, 2018 For the 12 month period ended December 31, 2017 Balance at beginning of period $ 5,572 $ 4,727 Share of (losses) earnings for the period (1) (4 ) 118 Foreign currency translation and other (325 ) 167 Share of other reserves for the period—OCI 63 183 Distributions (20 ) (66 ) Disposition of interest (1),(2) (951 ) (177 ) Acquisitions (3),(4) 72 620 Ending Balance $ 4,407 $ 5,572 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings, a Chilean electricity transmission operation, for $1.3 billion . On disposition, Brookfield Infrastructure recognized a gain on sale of $338 million ( $209 million , net of taxes) presented within gain on sale of associate on the Consolidated Statements of Operating Results. In association with the gain, $35 million of accumulated other comprehensive losses were reclassified to share of losses from associates and joint ventures on the Consolidated Statements of Operating Results. Please refer to Note 4 Disposition of Chilean Electricity Transmission Operation for additional details. 2. In August 2017, Brookfield Infrastructure and its institutional partners 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 a portion of the investment attributable to an institutional partner representing approximately an 8% stake. 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. 3. 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. 4. Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership to 45% . No injection was made during the six -month period ended June 30, 2018 . The following table represents the carrying value of our partnership’s investments in associates and joint ventures: As of US$ MILLIONS June 30, 2018 December 31, 2017 Brazilian toll road operation $ 1,467 $ 1,715 North American natural gas transmission operation 1,034 1,013 European telecommunications infrastructure operation 638 614 Brazilian rail operation 375 436 Australian ports operation 176 191 Chilean electricity transmission operation — 930 Other associates (1) 717 673 Ending Balance $ 4,407 $ 5,572 1. Other includes our partnership’s Texas electricity transmission project, Brazilian 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 by consolidated subsidiaries. The following tables summarize the aggregate balances of investments in associates on a 100% basis: As of US$ MILLIONS June 30, 2018 December 31, 2017 Financial position: Total assets $ 31,412 $ 40,375 Total liabilities (15,950 ) (20,575 ) Net assets $ 15,462 $ 19,800 For the three-month For the six-month US$ MILLIONS 2018 2017 2018 2017 Financial performance: Total revenue $ 1,406 $ 1,629 $ 2,973 $ 3,074 Total income for the period 32 122 96 181 Brookfield Infrastructure’s share of net income before reclassification 1 36 31 59 Reclassification of previously recognized foreign currency movements (1) — — (35 ) — Brookfield Infrastructure’s share of net income (loss) $ 1 $ 36 $ (4 ) $ 59 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings. In conjunction with the sale, $35 million of accumulated other comprehensive losses were reclassified to the Consolidated Statement of Operating Results and recorded within share of losses from associates and joint ventures.

BORROWINGS

BORROWINGS	6 Months Ended
	Jun. 30, 2018
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 purposes 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, 2023 . 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 1.2% . Brookfield Infrastructure is required to pay an unused commitment fee under the facility of 18 basis points per annum. As at June 30, 2018 , draws on the credit facility were $nil ( 2017 : $789 million ) and $59 million of letters of credit were issued ( 2017 : $106 million ). Maturity Annual Rate Currency As of June 30, 2018 December 31, 2017 Corporate revolving credit facility June 30, 2023 LIBOR plus 1.2% US$ $ — $ 789 Medium-term notes (1) : Current: Public - Canadian October 30, 2018 3.0% C$ 95 99 Non-current: Public - Canadian October 30, 2020 3.5% C$ 285 298 Public - Canadian March 11, 2022 3.5% C$ 343 358 Public - Canadian February 22, 2024 3.3% C$ 228 239 Public - Canadian February 22, 2024 3.3% C$ 305 318 Total $ 1,256 $ 2,101 1. See Note 12 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 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, issued C $300 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% . 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 automatically renews for four consecutive one year terms, which would result in the facility 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. Loans under this facility accrued interest on LIBOR plus 2.0% and no commitment fees were incurred for any undrawn balance. As of June 30, 2018 , there were $nil (2017: $nil ) borrowings outstanding. The weakening of the Canadian dollar against the U.S. dollar during the six -month period ended June 30, 2018 resulted in a decrease in corporate borrowings of $56 million from December 31, 2017 . b) Non-Recourse Borrowings As of US$ MILLIONS June 30, 2018 December 31, 2017 Current $ 226 $ 364 Non-current 9,463 7,699 Total $ 9,689 $ 8,063 Non-recourse borrowings have increased by $1.6 billion since year-end. The increase is attributable to the issuance of $ 1.5 billion five -year senior notes at our Brazilian regulated gas transmission business in the local market at a rate of approximately 7.1% at the time of issuance, which was used to fund a return of capital to shareholders. The remaining increase is due to additional net borrowings of $100 million associated with growth capital projects at our operating entities, partially offset by a decrease in foreign denominated debt as currencies we operate in depreciated relative to the U.S. dollar during the six-month period ended June 30, 2018 .

CAPITAL MANAGEMENT

CAPITAL MANAGEMENT	6 Months Ended
	Jun. 30, 2018
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 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. As of US$ MILLIONS June 30, 2018 December 31, 2017 Partnership Capital $ 12,276 $ 13,474 Remove impact of the following items since inception: Non-controlling interest - in operating subsidiaries (5,125 ) (5,875 ) Deficit 842 1,366 Accumulated other comprehensive income (120 ) (1,257 ) Ownership changes (109 ) (109 ) Invested Capital $ 7,764 $ 7,599 The following table presents the change in Invested Capital during the three and six -month periods ended June 30, 2018 : For the three-month For the six-month US$ MILLIONS 2018 2017 2018 2017 Opening balance $ 7,760 $ 6,613 $ 7,599 $ 6,387 Issuance of preferred units — — 157 220 Issuance of limited partnership units and redeemable partnership units 4 5 8 11 Ending balance $ 7,764 $ 6,618 $ 7,764 $ 6,618 Weighted Average Invested Capital $ 7,760 $ 6,613 $ 7,738 $ 6,578

SUBSIDIARY PUBLIC ISSUERS

SUBSIDIARY PUBLIC ISSUERS	6 Months Ended
	Jun. 30, 2018
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 three -year and five -year 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% . These notes are unconditionally guaranteed by our partnership and its subsidiaries, Brookfield Infrastructure L.P. (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 THREE-MONTH PERIOD ENDED Our partnership (2) The Issuers Subsidiaries of our partnership other than the Issuers (3) Consolidating adjustments (4) Our partnership consolidated Revenues $ — $ — $ — $ 1,044 $ 1,044 Net income attributable to partnership (1) 64 — 125 (64 ) 125 FOR THE THREE-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 934 $ 934 Net (loss) income attributable to partnership (1) (10 ) — 13 10 13 FOR THE SIX-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 2,057 $ 2,057 Net income attributable to partnership (1) 186 — 334 (186 ) 334 FOR THE SIX-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 1,590 $ 1,590 Net (loss) income attributable to partnership (1) (14 ) — 35 14 35 AS OF JUNE 30, 2018 Current assets $ — $ — $ — $ 2,135 $ 2,135 Non-current assets 5,244 — 6,567 14,884 26,695 Current liabilities — — — 1,470 1,470 Non-current liabilities — 1,256 — 13,828 15,084 Non-controlling interests – Redeemable Partnership Units held by Brookfield — — — 1,832 1,832 Non-controlling interests – in operating subsidiaries — — — 5,125 5,125 Preferred unitholders — — — 752 752 AS OF 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 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

REVENUES	6 Months Ended
	Jun. 30, 2018
Revenue [abstract]
Disclosure of disaggregation of revenue from contracts with customers [text block]	REVENUE The following table disaggregates revenues by segment: US$ MILLIONS For the three-month period ended June 30, 2018 For the six-month period ended June 30, 2018 Utilities $ 589 $ 1,124 Transport 341 680 Energy 114 253 Total $ 1,044 $ 2,057 Substantially all of our partnership’s revenues are recognized over time as services are rendered. The following table disaggregates revenues by geographical region: US$ MILLIONS For the three-month period ended June 30, 2018 For the six-month period ended June 30, 2018 Australia $ 288 $ 572 Brazil 278 583 United Kingdom 166 325 Colombia 127 171 Canada 47 124 Chile 43 88 United States of America 42 83 Other (1) 53 111 Total $ 1,044 $ 2,057 1. Includes revenues earned in India, New Zealand, and Peru.

PARTNERSHIP CAPITAL

PARTNERSHIP CAPITAL	6 Months Ended
	Jun. 30, 2018
Equity [abstract]
PARTNERSHIP CAPITAL	PARTNERSHIP CAPITAL As at June 30, 2018 , our partnership’s capital structure was comprised of three classes of partnership units: limited partnership 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 to 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. (a) Special General and Limited Partnership Capital Special General Partner Units Limited Partnership Units Total UNITS MILLIONS As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended Opening balance 1.6 1.6 276.6 259.4 278.2 261.0 Issued for cash — — 0.2 17.2 0.2 17.2 Ending balance 1.6 1.6 276.8 276.6 278.4 278.2 The weighted average number of special general partner units outstanding for the three and six-month periods ended June 30, 2018 was 1.6 million ( 2017 : 1.6 million ). The weighted average number of limited partnership units outstanding for the three and six -month periods ended June 30, 2018 was 276.7 million and 276.6 million , respectively ( 2017 : 259.6 million and 259.5 million ). Special General Partner Limited Partners Total US$ MILLIONS As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended Opening balance $ 19 $ 19 $ 4,907 $ 4,215 $ 4,926 $ 4,234 Unit issuance — — 8 692 8 692 Ending balance $ 19 $ 19 $ 4,915 $ 4,907 $ 4,934 $ 4,926 In September 2017, our partnership issued 16.6 million 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. 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 six -month period ending June 30, 2018 , our partnership issued less than 1 million units for proceeds of $8 million (2017: less than 1 million units for proceeds of $11 million ). (b) Non-controlling interest – Redeemable Partnership Units held by Brookfield Non-controlling interest – Redeemable Partnership Units held by Brookfield UNITS MILLIONS As of and for the As of and for the 12 month period ended Opening balance 115.8 108.4 Issued for cash — 7.4 Ending balance 115.8 115.8 The weighted average number of Redeemable Partnership Units outstanding for the three and six -month periods ended June 30, 2018 was 115.8 million ( 2017 : 108.4 million for the three and six -month periods). Non-controlling interest – Redeemable Partnership Units held by Brookfield US$ MILLIONS As of and for the As of and for the 12 month period ended Opening balance $ 2,078 $ 1,778 Unit issuance — 300 Ending balance $ 2,078 $ 2,078 In September 2017, Brookfield Infrastructure issued 7.4 million Redeemable Partnership Units to Brookfield for proceeds of $300 million . c) Preferred Unitholders’ Capital Preferred Units UNITS MILLIONS As of and for the As of and for the 12 month period ended Opening balance 32.0 20.0 Issued for cash 8.0 12.0 Ending balance 40.0 32.0 Preferred Units US$ MILLIONS As of and for the As of and for the 12 month period ended Opening balance $ 595 $ 375 Unit issuance 157 220 Ending balance $ 752 $ 595 In January 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, $ 161 million or C $200 million of gross proceeds were raised, $4 million in underwriting costs were incurred and less than $1 million in issuance costs were incurred. In January 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, $225 million or C $300 million of gross proceeds were raised, $4 million in underwriting costs were incurred and less than $1 million in issuance costs were incurred.

DISTRIBUTIONS

DISTRIBUTIONS	6 Months Ended
	Jun. 30, 2018
Distributions [Abstract]
DISTRIBUTIONS	DISTRIBUTIONS For the three and six -month periods ended June 30, 2018 , distributions to partnership unitholders were $185 million and $370 million , respectively, or $0.47 and $0.94 , respectively, per partnership unit ( 2017 : $160 million and $320 million or $0.435 and $0.87 per partnership unit), an 8% increase from December 31, 2017. Additionally, incentive distributions were made to the special general partner of $34 million and $68 million for the three and six-month periods ended June 30, 2018 , respectively ( 2017 : $28 million and $56 million ). For the three and six -month periods ended June 30, 2018 , our partnership declared preferred unit distributions of $10 million and $19 million , respectively, or $0.25 and $0.48 , respectively, per preferred unit ( 2017 : $8 million and $14 million or $0.25 and $0.49 per preferred unit).

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME	6 Months Ended
	Jun. 30, 2018
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 Foreign Net Cash flow Marketable securities Unrealized Equity Accumulated Balance at January 1, 2018 $ 976 $ (835 ) $ 28 $ (26 ) $ — $ (27 ) $ 748 $ 864 Other comprehensive (loss) income (1) — (380 ) 34 (37 ) (8 ) — 44 (347 ) Other items (450 ) — — — — — — (450 ) Balance at June 30, 2018 $ 526 $ (1,215 ) $ 62 $ (63 ) $ (8 ) $ (27 ) $ 792 $ 67 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 957 $ (891 ) $ 215 $ (130 ) $ (4 ) $ (30 ) $ 619 $ 736 Other comprehensive income (loss) — 30 (138 ) 24 2 — (37 ) (119 ) Balance at June 30, 2017 $ 957 $ (861 ) $ 77 $ (106 ) $ (2 ) $ (30 ) $ 582 $ 617 b) Attributable to General Partner US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2018 $ 7 $ (6 ) $ 1 $ — $ — $ — $ 4 $ 6 Other comprehensive loss (1) — (2 ) — — — — — (2 ) Other items (3 ) — — — — — — (3 ) Balance at June 30, 2018 $ 4 $ (8 ) $ 1 $ — $ — $ — $ 4 $ 1 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 7 $ (5 ) $ 3 $ (1 ) $ — $ — $ 3 $ 7 Other comprehensive loss — — (1 ) — — — — (1 ) Balance at June 30, 2017 $ 7 $ (5 ) $ 2 $ (1 ) $ — $ — $ 3 $ 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 Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2018 $ 425 $ (339 ) $ 11 $ (14 ) $ (2 ) $ (8 ) $ 314 $ 387 Other comprehensive (loss) income (1) — (159 ) 13 (16 ) (4 ) — 19 (147 ) Other items (188 ) — — — — — — (188 ) Balance at June 30, 2018 $ 237 $ (498 ) $ 24 $ (30 ) $ (6 ) $ (8 ) $ 333 $ 52 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 417 $ (365 ) $ 88 $ (58 ) $ (3 ) $ (9 ) $ 261 $ 331 Other comprehensive income (loss) — 13 (58 ) 10 — — (15 ) (50 ) Balance at June 30, 2017 $ 417 $ (352 ) $ 30 $ (48 ) $ (3 ) $ (9 ) $ 246 $ 281 1. In relation to the sale of our Chilean electricity transmission business, $127 million of deferred tax expense previously recognized within accumulated other comprehensive income was reclassified as current income tax expense within accumulated other comprehensive income.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	6 Months Ended
	Jun. 30, 2018
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 three and six-month periods ended June 30, 2018 ( 2017 : less than $1 million for the three and six-month periods). b) Transactions with other related parties Since inception, Brookfield Infrastructure has had a management agreement (the “Master Services Agreement”) with certain service providers (the “Service Provider”), which are wholly-owned subsidiaries of Brookfield. 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 $52 million and $108 million , respectively, for the three and six-month periods ended June 30, 2018 ( 2017 : $57 million and $105 million ). As of June 30, 2018, $52 million was outstanding as payable to the Service Provider (December 31, 2017: $64 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. As of June 30, 2018 , $2 million is payable to the Service Provider relating to third party general and administrative and acquisition related expenses that were paid for by Brookfield on behalf of Brookfield Infrastructure ( 2017 : $nil ). These expenses were charged to Brookfield Infrastructure at cost. As of June 30, 2018 , Brookfield Infrastructure had a receivable balance of $20 million from subsidiaries of Brookfield ( December 31, 2017 : $20 million ) and loans payable of $73 million to subsidiaries of Brookfield ( December 31, 2017 : $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 funds on deposit with Brookfield. As of June 30, 2018 , Brookfield Infrastructure’s deposit balance with Brookfield was less than $1 million ( December 31, 2017 : less than $1 million ) and earned interest of less than $ 1 million for the three and six-month periods ended June 30, 2018 ( 2017 : less than $1 million and $1 million for the three and six-month periods ). 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. As of June 30, 2018 , there were $nil (December 31, 2017: $nil ) borrowings outstanding. 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 three and six-month periods ended June 30, 2018 , revenues of $2 million and $4 million , respectively, were generated ( 2017 : $1 million and $3 million ) and expenses of $1 million and $2 million , respectively, were incurred ( 2017 : $1 million for the three and six-month periods ). 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 three and six-month periods ended June 30, 2018 , Brookfield Infrastructure paid less than $1 million for these services ( 2017 : less than $1 million for the three and six-month periods ). Brookfield Infrastructure’s U.K. port operation provides port marine services on market terms to a subsidiary acquired by Brookfield Business Partners LP. For the three and six-month periods ended June 30, 2018 , revenues of $1 million and $2 million , respectively, were generated ( 2017 : $nil for the three and six-month periods). Brookfield Infrastructure’s Colombian regulated distribution business purchases electricity from, and distributes electricity on behalf of, a subsidiary of Brookfield Renewable Partners L.P. in the normal course of its operations. For the three and six-month periods ended June 30, 2018 , expenses of $3 million and $6 million , respectively, were incurred ( 2017 : $nil for the three and six-month periods ).

SIGNIFICANT ACCOUNTING POLICI24

SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2018
Corporate Information And Statement Of IFRS Compliance [Abstract]
Statement of Compliance	Statement of compliance These interim condensed and consolidated financial statements of our partnership and its subsidiaries (together “Brookfield Infrastructure”) have been prepared in accordance with International Accounting Standard 34, Interim Financial Reporting , (“IAS 34”) as issued by the International Accounting Standards Board (“IASB”) and using the accounting policies Brookfield Infrastructure applied in its consolidated financial statements as of and for the year ended December 31, 2017 , amended by the recently adopted accounting standards described in the section below. The accounting policies that our partnership applied in its annual consolidated financial statements as of and for the year ended December 31, 2017 are disclosed in Note 3 of such financial statements, with which reference should be made in reading these interim condensed and consolidated financial statements. These interim condensed and consolidated financial statements were authorized for issuance by the Board of Directors of our partnership on August 13, 2018 .
Recently adopted accounting standard amendments	Recently adopted accounting standard amendments Brookfield Infrastructure applied, for the first time, certain new standards applicable to our partnership that became effective January 1, 2018. The impact of adopting these new standards on our partnership’s accounting policies are as follows: IFRS 15 Revenue from Contracts with Customers (“IFRS 15”) IFRS 15 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. Our partnership adopted the standard on January 1, 2018, on a modified retrospective basis. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Apart from additional disclosure requirements, the adoption did not have a significant impact on the partnership’s condensed and consolidated financial statements and therefore has not been included in the “ Cumulative effect of changes ” section below. 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 each contains a single performance obligation that is recognized over time. The connection revenue relating to Brookfield Infrastructure’s regulated distribution operation contains a distinct performance obligation that is recognized over the period that the connection is constructed, based on an input method of progress recognition on the basis that this methodology is most reflective of the underlying transfer of control. Terminal infrastructure revenue contains both a capacity charge and a handling charge associated with operating the terminal. The terminal infrastructure service contracts contain a performance obligation recognized over time pertaining to capacity for the period the services are provided and for handling service based on tons of coal shipped through the terminal when service is provided. The payment terms for all of our businesses in the utilities segment require payment upon completion, except for connections income whereby payment is typically collected up-front prior to the completion of any services. Transport Revenue from transport infrastructure consists primarily of freight, toll road operations and transportation services revenue. These services consist of a single performance obligation and revenue is recognized over time when services are rendered, based primarily on usage or volume during the period. The payment terms for all of our businesses in the transport segment require payment upon completion of the underlying transportation service. Energy Revenue from energy infrastructure consists primarily of energy transmission and storage as well as district energy services. Energy transmission services revenue consists of a single performance obligation and is recognized over time as services are rendered, based primarily on usage or volume throughput. Performance obligations relating to district energy contracts are satisfied over time as the services are rendered. Gas storage revenues contain both a capacity charge and a variable charge, however the associated services are highly interdependent and represent a single performance obligation that is satisfied over time as the services are provided. The payment terms for all of our businesses in the energy segment require payment upon completion of the underlying service within a given period. Data Infrastructure Revenue from data infrastructure is derived from contracts with media broadcasting and telecom customers to access infrastructure. These contracts consist of performance obligations that are satisfied over time in accordance with the underlying agreements. The payment terms for our businesses in the data infrastructure segment require upfront and recurring payments to lease space on towers to host the customers’ equipment. The differing payment terms do not constitute separate performance obligations as revenue is recognized over time for the period the services are provided. IFRS 9 Financial Instruments (“IFRS 9”) 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. The standard includes changes regarding the classification of certain financial instruments as outlined in the table below. These changes have not had a material impact on our partnership’s consolidated financial statements. The standard also includes a new general hedge accounting standard which aligns 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 allows 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. Our partnership has adopted the standards as of January 1, 2018 retrospectively with no restatement of comparative periods. Certain hedge accounting relationships relating to aggregated foreign currency exposures now qualify for hedge accounting under this new standard. Consequently, the partnership has applied 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. A cumulative catch-up adjustment has been recorded through equity upon initial adoption. Financial Instrument Classification Our partnership classifies cash and cash equivalents and accounts receivable and other as amortized cost. Additionally, our partnership maintains a portfolio of marketable securities comprised of liquid equity and debt securities. The marketable securities are classified either as fair value through other comprehensive income (“FVTOCI”) or fair value through profit or loss (“FVTPL”). Derivative assets are classified as FVTPL, except for derivatives in certain hedging relationships. Other financial assets are classified as either amortized cost or FVTOCI. Financial assets classified as FVTPL or FVTOCI are subsequently measured at fair value at each reporting date. For financial assets classified as FVTPL, the change in fair value is recorded through profit or loss. For financial assets classified as FVTOCI, the change in fair value is recorded in other comprehensive income. The cumulative gains or losses related to FVTOCI equity instruments are not reclassified to profit or loss on disposal, whereas the cumulative gains or losses on all other FVTOCI assets are reclassified to profit or loss on disposal. For financial instruments at amortized cost or debt instruments at FVTOCI, the partnership assesses if there have been significant increases in credit risk since initial recognition to determine whether lifetime or 12-month expected credit losses should be recognized. Any related loss allowances are recorded through profit or loss. Borrowings, accounts payable and other, and preferred shares are classified as amortized cost, except for derivatives embedded in related financial instruments. Embedded derivatives and any other derivative liabilities are classified as FVTPL and are subsequently measured at fair value, except for derivatives in certain hedging relationships. Other financial liabilities are classified as either FVTPL or amortized cost. Financial instruments classified as amortized cost upon adoption of IFRS 9 were previously classified as loans and receivables. Financial assets classified as FVTOCI and certain marketable securities classified as FVTPL were previously classified as available-for-sale securities. The changes in classification had no impact on the carrying values and there were no changes to the classification of the remainder of financial assets classified as FVTPL. Hedge Accounting 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 that the hedging relationship meets all of the hedge effectiveness requirements. 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. 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. IFRIC 22 Foreign Currency Transactions (“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 partnership has adopted the standard as of January 1, 2018 prospectively. The adoption did not have a significant impact on the partnership’s condensed and consolidated financial statements. c) Cumulative effect of changes The changes made to our January 1, 2018 condensed and consolidated statement of financial position for the adoption of IFRS 9 was driven by our North American gas storage business, which elected to account for certain physical commodity contracts as financial instruments under IFRS 9. This election resulted in the recognition of the fair values of the contracts as financial assets or financial liabilities and the cumulative mark-to-market gains directly in partnership capital. The impacts of this election were increases of $25 million , $9 million and $16 million in total assets, total liabilities and total partnership capital, respectively. The adoption of all other accounting standards did not have an impact to our January 1, 2018 assets, liabilities or partnership capital.
Future Changes in Accounting Policies	Standards issued but not yet adopted IFRS 16 Leases ( “ IFRS 16 ” ) In January 2016, the IASB published a new standard, IFRS 16, Leases (“IFRS 16”). The new standard brings most leases on balance sheet, 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. Our partnership continues to evaluate the overall impact of IFRS 16 on its consolidated financial statements. Our partnership has participated in strategic planning sessions with its subsidiaries and associates in order to provide guidance regarding the key considerations and to develop an adoption project plan. Our partnership is completing its assessment of existing contractual arrangements to identify the existing population of lease arrangements that would be capitalized under the new standard. Next steps include performing an initial quantification of the impact, assessing any potential impact to IT systems and internal controls and reviewing the additional disclosures required by the new standard. IFRS 16 can either be adopted on a full retrospective method or on a modified retrospective method whereby any transitional impact is recorded in equity as at January 1, 2019 and comparative periods are not restated. Our partnership has tentatively determined that the modified retrospective approach will be adopted and we are currently in the process of evaluating a number of practical expedients available under the new standard. e) Interpretations issued but not yet adopted 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.

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2018
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 periods under review: Total Attributable to Brookfield Infrastructure AS OF JUNE 30, 2018 Utilities Transport Energy Data Infrastructure Corporate Total Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials (1) US$ MILLIONS Total assets $ 4,828 $ 6,457 $ 3,104 $ 1,072 $ (781 ) $ 14,680 $ (2,391 ) $ 12,115 $ 4,426 $ 28,830 Total Attributable to Brookfield Infrastructure AS OF DECEMBER 31, 2017 Utilities Transport Energy Data Infrastructure Corporate Total Contribution from investments in associates Attributable to non- controlling interest Working capital adjustment and other As per IFRS financials (1) US$ MILLIONS Total assets $ 6,542 $ 6,990 $ 3,134 $ 1,049 $ (1,083 ) $ 16,632 $ (3,134 ) $ 11,668 $ 4,311 $ 29,477 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. Total attributable to Brookfield Infrastructure FOR THE THREE-MONTH PERIOD ENDED Utilities Transport Energy Data (1) Corporate Total Contribution Attributable As per (2) Revenues $ 245 $ 410 $ 137 $ 45 $ — $ 837 $ (368 ) $ 575 $ 1,044 Costs attributed to revenues (68 ) (237 ) (68 ) (22 ) — (395 ) 211 (283 ) (467 ) General and administrative costs — — — — (54 ) (54 ) — — (54 ) Adjusted EBITDA 177 173 69 23 (54 ) 388 (157 ) 292 Other (expense) income (8 ) — 3 (1 ) 16 10 4 (26 ) (12 ) Interest expense (30 ) (40 ) (18 ) (3 ) (13 ) (104 ) 30 (51 ) (125 ) FFO 139 133 54 19 (51 ) 294 (123 ) 215 Depreciation and amortization (43 ) (85 ) (38 ) (17 ) — (183 ) 91 (96 ) (188 ) Deferred taxes (12 ) (1 ) (1 ) — 1 (13 ) (3 ) (10 ) (26 ) Mark-to-market on hedging items and other (10 ) (23 ) (20 ) 1 79 27 34 (15 ) 46 Share of earnings from associates — — — — — — 1 — 1 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (94 ) (94 ) Net income (loss) attributable to partnership (3) $ 74 $ 24 $ (5 ) $ 3 $ 29 $ 125 $ — $ — $ 125 Total attributable to Brookfield Infrastructure FOR THE THREE-MONTH PERIOD ENDED Utilities Transport Energy Data (1) Corporate Total Contribution Attributable to non-controlling As per IFRS (2) Revenues $ 278 $ 395 $ 123 $ 41 $ — $ 837 $ (408 ) $ 505 $ 934 Costs attributed to revenues (73 ) (224 ) (60 ) (18 ) — (375 ) 220 (218 ) (373 ) General and administrative costs — — — — (59 ) (59 ) — — (59 ) Adjusted EBITDA 205 171 63 23 (59 ) 403 (188 ) 287 Other (expense) income (8 ) 1 3 (1 ) 7 2 1 (16 ) (13 ) Interest expense (29 ) (38 ) (23 ) (3 ) (17 ) (110 ) 44 (41 ) (107 ) FFO 168 134 43 19 (69 ) 295 (143 ) 230 Depreciation and amortization (57 ) (75 ) (35 ) (19 ) — (186 ) 91 (111 ) (206 ) Deferred taxes (12 ) 2 5 3 (3 ) (5 ) (3 ) (10 ) (18 ) Mark-to-market on hedging items and other (12 ) (18 ) (12 ) (1 ) (48 ) (91 ) 19 13 (59 ) Share of earnings from associates — — — — — — 36 — 36 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (122 ) (122 ) Net income (loss) attributable to partnership (3) $ 87 $ 43 $ 1 $ 2 $ (120 ) $ 13 $ — $ — $ 13 Total attributable to Brookfield Infrastructure FOR THE SIX-MONTH PERIOD ENDED Utilities Transport Energy Data Infrastructure (1) Corporate Total Contribution from investments in associates Attributable to non-controlling interest As per IFRS financials (2) Revenues $ 517 $ 834 $ 290 $ 88 $ — $ 1,729 $ (791 ) $ 1,119 $ 2,057 Costs attributed to revenues (137 ) (483 ) (142 ) (42 ) — (804 ) 431 (503 ) (876 ) General and administrative costs — — — — (112 ) (112 ) — — (112 ) Adjusted EBITDA 380 351 148 46 (112 ) 813 (360 ) 616 Other (expense) income (11 ) 2 8 (2 ) 33 30 4 (51 ) (17 ) Interest expense (61 ) (83 ) (36 ) (6 ) (30 ) (216 ) 72 (95 ) (239 ) FFO 308 270 120 38 (109 ) 627 (284 ) 470 Depreciation and amortization (101 ) (184 ) (71 ) (37 ) — (393 ) 202 (190 ) (381 ) Deferred taxes (27 ) 12 (3 ) 2 1 (15 ) (12 ) (14 ) (41 ) Mark-to-market on hedging items and other (57 ) (62 ) (38 ) 1 (67 ) (223 ) 98 (54 ) (179 ) Gain on sale of associates — — — — 338 338 — — 338 Share of losses from associates — — — — — — (4 ) — (4 ) Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (212 ) (212 ) Net income attributable to partnership (3) $ 123 $ 36 $ 8 $ 4 $ 163 $ 334 $ — $ — $ 334 Total attributable to Brookfield Infrastructure FOR THE SIX-MONTH PERIOD ENDED Utilities Transport Energy Data Infrastructure (1) Corporate Total Contribution from investments in associates Attributable to non-controlling interest As per IFRS financials (2) Revenues $ 454 $ 770 $ 265 $ 80 $ — $ 1,569 $ (788 ) $ 809 $ 1,590 Costs attributed to revenues (121 ) (434 ) (116 ) (35 ) — (706 ) 411 (421 ) (716 ) General and administrative costs — — — — (110 ) (110 ) — — (110 ) Adjusted EBITDA 333 336 149 45 (110 ) 753 (377 ) 388 Other (expense) income (7 ) (2 ) 6 (1 ) 27 23 7 (16 ) 14 Interest expense (58 ) (77 ) (50 ) (6 ) (29 ) (220 ) 93 (74 ) (201 ) FFO 268 257 105 38 (112 ) 556 (277 ) 298 Depreciation and amortization (89 ) (151 ) (68 ) (36 ) — (344 ) 179 (161 ) (326 ) Deferred taxes (18 ) 7 — 5 (2 ) (8 ) (1 ) (9 ) (18 ) Mark-to-market on hedging items and other (28 ) (39 ) (19 ) (2 ) (81 ) (169 ) 40 18 (111 ) Share of earnings from associates — — — — — — 59 — 59 Net income attributable to non-controlling interest and preferred unitholders — — — — — — — (146 ) (146 ) Net income (loss) attributable to partnership (3) $ 133 $ 74 $ 18 $ 5 $ (195 ) $ 35 $ — $ — $ 35 1. During the second quarter of 2018, our Communications Infrastructure segment was renamed to Data Infrastructure. There was no concurrent change in the operations which comprise the segment. 2. 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. 3. Includes net income (loss) attributable to non-controlling interests—Redeemable Partnership Units held by Brookfield, general partner and limited partners.

ACQUISITION OF BUSINESSES (Tabl

ACQUISITION OF BUSINESSES (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of detailed information about business combination [abstract]
Disclosure of detailed information about business combinations	The following table summarizes the purchase price allocation of individually insignificant business combinations that were completed in 2017. US$ MILLIONS Cash $ 9 Consideration payable 21 Total consideration $ 30 Fair value of assets and liabilities acquired: US$ MILLIONS Accounts receivable and other $ 28 Goodwill 14 Property, plant and equipment 104 Deferred income tax and other liabilities (30 ) Non-recourse borrowings (30 ) Net assets acquired before non-controlling interest 86 Non-controlling interest (1) (56 ) Net assets acquired $ 30 1. Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value at the acquisition date. On June 1, 2018, Brookfield Infrastructure, alongside institutional partners (the “GN consortium”), acquired an effective 16% interest in Gas Natural, S.A. ESP (“GN”), a Colombian natural gas distribution business, for total consideration by Brookfield Infrastructure of $150 million (GN consortium total of $522 million ). The acquisition was funded through equity of $ 88 million (GN consortium total of $309 million ) and the remainder with asset level debt raised concurrently on closing. 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 1, 2018. Acquisition costs of $2 million were recorded as Other expenses within the Consolidated Statements of Operating Results in the second quarter of 2018. Consideration transferred US$ MILLIONS Cash $ 118 Pre-existing interest of GN (1) 32 Total Consideration $ 150 1. Brookfield Infrastructure acquired a 3% interest in GN in December 2017, which had a fair market value of $32 million as at the date of acquisition. No gain or loss resulted from this acquisition. Fair value of assets and liabilities acquired as of June 1, 2018 (provisional) (1) : US$ MILLIONS Cash and cash equivalents $ 21 Accounts receivable and other 275 Property, plant and equipment 487 Intangible assets 17 Goodwill 770 Accounts payable and other liabilities (238 ) Deferred income tax liabilities (83 ) Non-recourse borrowings (185 ) Net assets acquired before non-controlling interest 1,064 Non-controlling interest (2),(3) (914 ) Net assets acquired $ 150 1. The fair values of all acquired assets and liabilities for this operation have been determined on a provisional basis given the proximity of the acquisition to the reporting date, pending finalization of the determination of the fair values of the acquired net assets. Our partnership is in the process of obtaining additional information in order to assess the fair value of property, plant and equipment, intangible assets and provisions as at the date of acquisition. Our partnership has engaged a third party valuation company to support management’s assessment of the fair value. 2. Non-controlling interest represents the interest not acquired by Brookfield Infrastructure, measured at fair value as at the acquisition date based on the enterprise value of the business as per the underwriting model. 3. Non-controlling interest includes an investment funded with asset level debt raised concurrently on closing. Upon acquisition of an interest in GN, an additional deferred tax liability of $76 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 gave rise to goodwill of $76 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. The goodwill recorded on acquisition is largely reflective of potential customer growth and growth under existing contracts arising from the business’ position as a key distributor of natural gas in various markets of Colombia. None of the goodwill recognized is deductible for income tax purposes. Had the acquisition of the Colombian natural gas distribution business been effective January 1, 2018, the revenue and net income of Brookfield Infrastructure would have been $2,457 million and $571 million , respectively, for the six-month period ended June 30, 2018 . On April 4, 2017, Brookfield Infrastructure, alongside institutional partners (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 $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 $8 million were recorded as Other expenses within the Consolidated Statements of Operating Results in 2017. Consideration transferred US$ MILLIONS Cash $ 1,306 Consideration payable (1) 262 Total Consideration $ 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. 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 (1) 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 (2) (4,009 ) Net assets acquired $ 1,568 1. Represents authorizations that expire between 2039 and 2041. 2. 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 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.

FAIR VALUE OF FINANCIAL INSTR27

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Measurement [Abstract]
Disclosure of financial assets	The following table provides the allocation of financial instruments and their associated classifications as at June 30, 2018 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total Financial assets Cash and cash equivalents $ — $ — $ 782 $ 782 Accounts receivable and other — — 949 949 Financial assets (current and non-current) (1) 668 34 136 838 Marketable securities 143 48 — 191 Total $ 811 $ 82 $ 1,867 $ 2,760 Financial liabilities Corporate borrowings $ — $ — $ 1,256 $ 1,256 Non-recourse borrowings (current and non-current) — — 9,689 9,689 Accounts payable and other — — 1,026 1,026 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 309 — 899 1,208 Total $ 309 $ — $ 12,890 $ 13,199 1. Derivative instruments which are elected for hedge accounting totaling $522 million are included in financial assets and $54 million of derivative instruments are included in financial liabilities. 2. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the allocation of financial instruments and their associated classifications as at December 31, 2017 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total 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. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield.
Disclosure of financial liabilities	The following table provides the allocation of financial instruments and their associated classifications as at June 30, 2018 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total Financial assets Cash and cash equivalents $ — $ — $ 782 $ 782 Accounts receivable and other — — 949 949 Financial assets (current and non-current) (1) 668 34 136 838 Marketable securities 143 48 — 191 Total $ 811 $ 82 $ 1,867 $ 2,760 Financial liabilities Corporate borrowings $ — $ — $ 1,256 $ 1,256 Non-recourse borrowings (current and non-current) — — 9,689 9,689 Accounts payable and other — — 1,026 1,026 Preferred shares (2) — — 20 20 Financial liabilities (current and non-current) (1) 309 — 899 1,208 Total $ 309 $ — $ 12,890 $ 13,199 1. Derivative instruments which are elected for hedge accounting totaling $522 million are included in financial assets and $54 million of derivative instruments are included in financial liabilities. 2. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. The following table provides the allocation of financial instruments and their associated classifications as at December 31, 2017 : US$ MILLIONS Financial Instrument Classification MEASUREMENT BASIS Fair value through profit or loss Fair value through OCI Amortized Cost Total 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. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield.
Carrying and fair values of financial assets	The fair value of our partnership’s financial assets and financial liabilities are measured at fair value on a recurring basis. The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s financial assets and financial liabilities: US$ MILLIONS Fair value hierarchy June 30, 2018 December 31, 2017 Marketable securities Level 1 (1) $ 191 $ 85 Foreign currency forward contracts Level 2 (2) Financial asset $ 305 $ 236 Financial liability 46 196 Interest rate swaps & other Level 2 (2) Financial asset $ 348 $ 381 Financial liability 161 155 Other contracts Level 3 (3) Financial asset $ 49 $ 48 Financial liability 102 89 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 assumptions concerning the amount and timing of estimated future cash flows and discount rates. The following table provides the carrying values and fair values of financial instruments as at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial assets Cash and cash equivalents $ 782 $ 782 $ 374 $ 374 Accounts receivable and other 949 949 838 838 Financial assets (current and non-current) 838 838 837 837 Marketable securities 191 191 85 85 Total $ 2,760 $ 2,760 $ 2,134 $ 2,134 Financial liabilities Corporate borrowings (1) $ 1,256 $ 1,261 $ 2,101 $ 2,113 Non-recourse borrowings (2) 9,689 9,978 8,063 8,392 Accounts payable and other (current and non-current) 1,026 1,026 864 864 Preferred shares (3) 20 20 20 20 Financial liabilities (current and non-current) 1,208 1,208 1,313 1,313 Total $ 13,199 $ 13,493 $ 12,361 $ 12,702 1. Corporate borrowings are 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 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. $20 million of preferred shares issued to wholly-owned subsidiaries of Brookfield. During the three-month period ended June 30, 2018 , no transfers were made between level 1 and 2 or level 2 and 3. The following table categorizes financial assets and liabilities, which are carried at fair value, based upon the level of input. June 30, 2018 December 31, 2017 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 191 $ — $ — $ 85 $ — $ — Financial assets (current and non-current) — 653 49 — 617 48 Financial liabilities Financial liabilities (current and non-current) $ — $ 207 $ 102 $ — $ 351 $ 89
Carrying and fair values of financial liabilities	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 June 30, 2018 December 31, 2017 Marketable securities Level 1 (1) $ 191 $ 85 Foreign currency forward contracts Level 2 (2) Financial asset $ 305 $ 236 Financial liability 46 196 Interest rate swaps & other Level 2 (2) Financial asset $ 348 $ 381 Financial liability 161 155 Other contracts Level 3 (3) Financial asset $ 49 $ 48 Financial liability 102 89 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 assumptions concerning the amount and timing of estimated future cash flows and discount rates. During the three-month period ended June 30, 2018 , 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. June 30, 2018 December 31, 2017 US$ MILLIONS Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Marketable securities $ 191 $ — $ — $ 85 $ — $ — Financial assets (current and non-current) — 653 49 — 617 48 Financial liabilities Financial liabilities (current and non-current) $ — $ 207 $ 102 $ — $ 351 $ 89 The following table provides the carrying values and fair values of financial instruments as at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 US$ MILLIONS Carrying Value Fair Value Carrying Value Fair Value Financial assets Cash and cash equivalents $ 782 $ 782 $ 374 $ 374 Accounts receivable and other 949 949 838 838 Financial assets (current and non-current) 838 838 837 837 Marketable securities 191 191 85 85 Total $ 2,760 $ 2,760 $ 2,134 $ 2,134 Financial liabilities Corporate borrowings (1) $ 1,256 $ 1,261 $ 2,101 $ 2,113 Non-recourse borrowings (2) 9,689 9,978 8,063 8,392 Accounts payable and other (current and non-current) 1,026 1,026 864 864 Preferred shares (3) 20 20 20 20 Financial liabilities (current and non-current) 1,208 1,208 1,313 1,313 Total $ 13,199 $ 13,493 $ 12,361 $ 12,702 1. Corporate borrowings are 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 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.

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	6 Months Ended
	Jun. 30, 2018
Property, plant and equipment [abstract]
Disclosure of detailed information about property, plant and equipment	US$ MILLIONS Utilities Assets Transport Assets Energy Assets Total Assets Gross Carrying Amount: Balance at January 1, 2017 $ 2,895 $ 2,362 $ 2,380 $ 7,637 Additions, net of disposals 349 104 95 548 Non-cash (disposals), net of additions — — (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 Additions, net of disposals 230 28 48 306 Acquisitions through business combinations (1) 487 — — 487 Non-cash (disposals), net of additions (23 ) (21 ) — (44 ) Net foreign currency exchange differences (86 ) (130 ) (48 ) (264 ) Balance at June 30, 2018 $ 4,079 $ 2,534 $ 2,629 $ 9,242 Accumulated depreciation: Balance at January 1, 2017 $ (383 ) $ (517 ) $ (258 ) $ (1,158 ) Depreciation expense (118 ) (147 ) (117 ) (382 ) Non-cash disposals 19 21 — 40 Disposals — — 5 5 Net foreign currency exchange differences (28 ) (44 ) (13 ) (85 ) Balance at December 31, 2017 $ (510 ) $ (687 ) $ (383 ) $ (1,580 ) Depreciation expense (70 ) (73 ) (65 ) (208 ) Disposals 2 13 — 15 Net foreign currency exchange differences 6 35 8 49 Balance at June 30, 2018 $ (572 ) $ (712 ) $ (440 ) $ (1,724 ) Accumulated fair value adjustments: Balance at January 1, 2017 $ 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 foreign currency exchange differences (2 ) (43 ) (12 ) (57 ) Balance at June 30, 2018 $ 1,256 $ 830 $ 617 $ 2,703 Net book value: December 31, 2017 $ 4,219 $ 2,843 $ 2,875 $ 9,937 June 30, 2018 $ 4,763 $ 2,652 $ 2,806 $ 10,221 1. Refer to Note 5 Acquisition of Businesses.

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	6 Months Ended
	Jun. 30, 2018
Intangible Assets [Abstract]
Disclosure of detailed information about intangible assets	As of US$ MILLIONS June 30, 2018 December 31, 2017 Cost $ 9,555 $ 10,470 Accumulated amortization (687 ) (576 ) Total $ 8,868 $ 9,894 Intangible assets are allocated to the following cash generating units: As of US$ MILLIONS June 30, 2018 December 31, 2017 Brazilian regulated gas transmission operation $ 4,314 $ 5,134 Australian regulated terminal 1,852 1,957 Peruvian toll roads 1,137 1,144 Chilean toll roads 1,010 1,100 U.K. port operation 283 289 Indian toll roads 114 130 Other (1) 158 140 Total $ 8,868 $ 9,894 1. Other intangibles are comprised of customer contracts at our Australian ports operations and contracted order book at our U.K. regulated distribution operation.
Disclosure of reconciliation of changes in intangible assets and goodwill	The following table presents the accumulated amortization for Brookfield Infrastructure’s intangible assets: For the six-month US$ MILLIONS 2018 2017 Accumulated amortization at beginning of the period $ (576 ) $ (267 ) Disposals — 1 Amortization (173 ) (143 ) Foreign currency translation 62 (9 ) Ending Balance $ (687 ) $ (418 ) The following table presents the change in the cost balance of intangible assets: For the six-month US$ MILLIONS 2018 2017 Cost at beginning of the period $ 10,470 $ 4,732 Additions through business combinations 17 5,539 Additions, net of disposals 32 46 Foreign currency translation (964 ) (25 ) Ending Balance $ 9,555 $ 10,292

INVESTMENT IN ASSOCIATES AND 30

INVESTMENT IN ASSOCIATES AND JOINT VENTURES (Tables)	6 Months Ended
	Jun. 30, 2018
Interests In Other Entities [Abstract]
Disclosure of joint ventures [text block]	The following tables summarize the aggregate balances of investments in associates on a 100% basis: As of US$ MILLIONS June 30, 2018 December 31, 2017 Financial position: Total assets $ 31,412 $ 40,375 Total liabilities (15,950 ) (20,575 ) Net assets $ 15,462 $ 19,800 For the three-month For the six-month US$ MILLIONS 2018 2017 2018 2017 Financial performance: Total revenue $ 1,406 $ 1,629 $ 2,973 $ 3,074 Total income for the period 32 122 96 181 Brookfield Infrastructure’s share of net income before reclassification 1 36 31 59 Reclassification of previously recognized foreign currency movements (1) — — (35 ) — Brookfield Infrastructure’s share of net income (loss) $ 1 $ 36 $ (4 ) $ 59 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings. In conjunction with the sale, $35 million of accumulated other comprehensive losses were reclassified to the Consolidated Statement of Operating Results and recorded within share of losses from associates and joint ventures. The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS For the six-month period ended June 30, 2018 For the 12 month period ended December 31, 2017 Balance at beginning of period $ 5,572 $ 4,727 Share of (losses) earnings for the period (1) (4 ) 118 Foreign currency translation and other (325 ) 167 Share of other reserves for the period—OCI 63 183 Distributions (20 ) (66 ) Disposition of interest (1),(2) (951 ) (177 ) Acquisitions (3),(4) 72 620 Ending Balance $ 4,407 $ 5,572 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings, a Chilean electricity transmission operation, for $1.3 billion . On disposition, Brookfield Infrastructure recognized a gain on sale of $338 million ( $209 million , net of taxes) presented within gain on sale of associate on the Consolidated Statements of Operating Results. In association with the gain, $35 million of accumulated other comprehensive losses were reclassified to share of losses from associates and joint ventures on the Consolidated Statements of Operating Results. Please refer to Note 4 Disposition of Chilean Electricity Transmission Operation for additional details. 2. In August 2017, Brookfield Infrastructure and its institutional partners 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 a portion of the investment attributable to an institutional partner representing approximately an 8% stake. 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. 3. 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. 4. Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership to 45% . No injection was made during the six -month period ended June 30, 2018 .
Disclosure of associates [text block]	The following tables summarize the aggregate balances of investments in associates on a 100% basis: As of US$ MILLIONS June 30, 2018 December 31, 2017 Financial position: Total assets $ 31,412 $ 40,375 Total liabilities (15,950 ) (20,575 ) Net assets $ 15,462 $ 19,800 For the three-month For the six-month US$ MILLIONS 2018 2017 2018 2017 Financial performance: Total revenue $ 1,406 $ 1,629 $ 2,973 $ 3,074 Total income for the period 32 122 96 181 Brookfield Infrastructure’s share of net income before reclassification 1 36 31 59 Reclassification of previously recognized foreign currency movements (1) — — (35 ) — Brookfield Infrastructure’s share of net income (loss) $ 1 $ 36 $ (4 ) $ 59 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings. In conjunction with the sale, $35 million of accumulated other comprehensive losses were reclassified to the Consolidated Statement of Operating Results and recorded within share of losses from associates and joint ventures. The following table represents the change in the balance of investments in associates and joint ventures: US$ MILLIONS For the six-month period ended June 30, 2018 For the 12 month period ended December 31, 2017 Balance at beginning of period $ 5,572 $ 4,727 Share of (losses) earnings for the period (1) (4 ) 118 Foreign currency translation and other (325 ) 167 Share of other reserves for the period—OCI 63 183 Distributions (20 ) (66 ) Disposition of interest (1),(2) (951 ) (177 ) Acquisitions (3),(4) 72 620 Ending Balance $ 4,407 $ 5,572 1. In March 2018, Brookfield Infrastructure sold its ownership in ETC Transmission Holdings, a Chilean electricity transmission operation, for $1.3 billion . On disposition, Brookfield Infrastructure recognized a gain on sale of $338 million ( $209 million , net of taxes) presented within gain on sale of associate on the Consolidated Statements of Operating Results. In association with the gain, $35 million of accumulated other comprehensive losses were reclassified to share of losses from associates and joint ventures on the Consolidated Statements of Operating Results. Please refer to Note 4 Disposition of Chilean Electricity Transmission Operation for additional details. 2. In August 2017, Brookfield Infrastructure and its institutional partners 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 a portion of the investment attributable to an institutional partner representing approximately an 8% stake. 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. 3. 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. 4. Throughout 2017, Brookfield Infrastructure, alongside an institutional partner, injected $349 million into the Brazilian toll road operation for growth capital expenditure requirements increasing our partnership’s ownership to 45% . No injection was made during the six -month period ended June 30, 2018 .
Disclosure of geographical areas [text block]	The following table represents the carrying value of our partnership’s investments in associates and joint ventures: As of US$ MILLIONS June 30, 2018 December 31, 2017 Brazilian toll road operation $ 1,467 $ 1,715 North American natural gas transmission operation 1,034 1,013 European telecommunications infrastructure operation 638 614 Brazilian rail operation 375 436 Australian ports operation 176 191 Chilean electricity transmission operation — 930 Other associates (1) 717 673 Ending Balance $ 4,407 $ 5,572 1. Other includes our partnership’s Texas electricity transmission project, Brazilian 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 by consolidated subsidiaries.

BORROWINGS (Tables)

BORROWINGS (Tables)	6 Months Ended
	Jun. 30, 2018
Financial Instruments [Abstract]
Disclosure of detailed information about borrowings	As of US$ MILLIONS June 30, 2018 December 31, 2017 Current $ 226 $ 364 Non-current 9,463 7,699 Total $ 9,689 $ 8,063 Maturity Annual Rate Currency As of June 30, 2018 December 31, 2017 Corporate revolving credit facility June 30, 2023 LIBOR plus 1.2% US$ $ — $ 789 Medium-term notes (1) : Current: Public - Canadian October 30, 2018 3.0% C$ 95 99 Non-current: Public - Canadian October 30, 2020 3.5% C$ 285 298 Public - Canadian March 11, 2022 3.5% C$ 343 358 Public - Canadian February 22, 2024 3.3% C$ 228 239 Public - Canadian February 22, 2024 3.3% C$ 305 318 Total $ 1,256 $ 2,101 1. See Note 12 Subsidiary Public Issuers for further details.

CAPITAL MANAGEMENT (Tables)

CAPITAL MANAGEMENT (Tables)	6 Months Ended
	Jun. 30, 2018
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. As of US$ MILLIONS June 30, 2018 December 31, 2017 Partnership Capital $ 12,276 $ 13,474 Remove impact of the following items since inception: Non-controlling interest - in operating subsidiaries (5,125 ) (5,875 ) Deficit 842 1,366 Accumulated other comprehensive income (120 ) (1,257 ) Ownership changes (109 ) (109 ) Invested Capital $ 7,764 $ 7,599 The following table presents the change in Invested Capital during the three and six -month periods ended June 30, 2018 : For the three-month For the six-month US$ MILLIONS 2018 2017 2018 2017 Opening balance $ 7,760 $ 6,613 $ 7,599 $ 6,387 Issuance of preferred units — — 157 220 Issuance of limited partnership units and redeemable partnership units 4 5 8 11 Ending balance $ 7,764 $ 6,618 $ 7,764 $ 6,618 Weighted Average Invested Capital $ 7,760 $ 6,613 $ 7,738 $ 6,578

SUBSIDIARY PUBLIC ISSUERS (Tabl

SUBSIDIARY PUBLIC ISSUERS (Tables)	6 Months Ended
	Jun. 30, 2018
Subsidiary Public Issuer [Abstract]
Condensed Financial Information	The following tables set forth consolidated summary financial information for our partnership and the Issuers: FOR THE THREE-MONTH PERIOD ENDED Our partnership (2) The Issuers Subsidiaries of our partnership other than the Issuers (3) Consolidating adjustments (4) Our partnership consolidated Revenues $ — $ — $ — $ 1,044 $ 1,044 Net income attributable to partnership (1) 64 — 125 (64 ) 125 FOR THE THREE-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 934 $ 934 Net (loss) income attributable to partnership (1) (10 ) — 13 10 13 FOR THE SIX-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 2,057 $ 2,057 Net income attributable to partnership (1) 186 — 334 (186 ) 334 FOR THE SIX-MONTH PERIOD ENDED Revenues $ — $ — $ — $ 1,590 $ 1,590 Net (loss) income attributable to partnership (1) (14 ) — 35 14 35 AS OF JUNE 30, 2018 Current assets $ — $ — $ — $ 2,135 $ 2,135 Non-current assets 5,244 — 6,567 14,884 26,695 Current liabilities — — — 1,470 1,470 Non-current liabilities — 1,256 — 13,828 15,084 Non-controlling interests – Redeemable Partnership Units held by Brookfield — — — 1,832 1,832 Non-controlling interests – in operating subsidiaries — — — 5,125 5,125 Preferred unitholders — — — 752 752 AS OF 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 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)	6 Months Ended
	Jun. 30, 2018
Revenue [abstract]
Disclosure of revenues	The following table disaggregates revenues by geographical region: US$ MILLIONS For the three-month period ended June 30, 2018 For the six-month period ended June 30, 2018 Australia $ 288 $ 572 Brazil 278 583 United Kingdom 166 325 Colombia 127 171 Canada 47 124 Chile 43 88 United States of America 42 83 Other (1) 53 111 Total $ 1,044 $ 2,057 1. Includes revenues earned in India, New Zealand, and Peru. The following table disaggregates revenues by segment: US$ MILLIONS For the three-month period ended June 30, 2018 For the six-month period ended June 30, 2018 Utilities $ 589 $ 1,124 Transport 341 680 Energy 114 253 Total $ 1,044 $ 2,057 Substantially all of our partnership’s revenues are recognized over time as services are rendered.

PARTNERSHIP CAPITAL (Tables)

PARTNERSHIP CAPITAL (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [abstract]
Disclosure of classes of share capital	(b) Non-controlling interest – Redeemable Partnership Units held by Brookfield Non-controlling interest – Redeemable Partnership Units held by Brookfield UNITS MILLIONS As of and for the As of and for the 12 month period ended Opening balance 115.8 108.4 Issued for cash — 7.4 Ending balance 115.8 115.8 c) Preferred Unitholders’ Capital Preferred Units UNITS MILLIONS As of and for the As of and for the 12 month period ended Opening balance 32.0 20.0 Issued for cash 8.0 12.0 Ending balance 40.0 32.0 Preferred Units US$ MILLIONS As of and for the As of and for the 12 month period ended Opening balance $ 595 $ 375 Unit issuance 157 220 Ending balance $ 752 $ 595 Non-controlling interest – Redeemable Partnership Units held by Brookfield US$ MILLIONS As of and for the As of and for the 12 month period ended Opening balance $ 2,078 $ 1,778 Unit issuance — 300 Ending balance $ 2,078 $ 2,078 Special General Partner Limited Partners Total US$ MILLIONS As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended Opening balance $ 19 $ 19 $ 4,907 $ 4,215 $ 4,926 $ 4,234 Unit issuance — — 8 692 8 692 Ending balance $ 19 $ 19 $ 4,915 $ 4,907 $ 4,934 $ 4,926 (a) Special General and Limited Partnership Capital Special General Partner Units Limited Partnership Units Total UNITS MILLIONS As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended As of and for the six-month period ended As of and for the 12 month period ended Opening balance 1.6 1.6 276.6 259.4 278.2 261.0 Issued for cash — — 0.2 17.2 0.2 17.2 Ending balance 1.6 1.6 276.8 276.6 278.4 278.2

ACCUMULATED OTHER COMPREHENSI36

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	6 Months Ended
	Jun. 30, 2018
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 Foreign Net Cash flow Marketable securities Unrealized Equity Accumulated Balance at January 1, 2018 $ 976 $ (835 ) $ 28 $ (26 ) $ — $ (27 ) $ 748 $ 864 Other comprehensive (loss) income (1) — (380 ) 34 (37 ) (8 ) — 44 (347 ) Other items (450 ) — — — — — — (450 ) Balance at June 30, 2018 $ 526 $ (1,215 ) $ 62 $ (63 ) $ (8 ) $ (27 ) $ 792 $ 67 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 957 $ (891 ) $ 215 $ (130 ) $ (4 ) $ (30 ) $ 619 $ 736 Other comprehensive income (loss) — 30 (138 ) 24 2 — (37 ) (119 ) Balance at June 30, 2017 $ 957 $ (861 ) $ 77 $ (106 ) $ (2 ) $ (30 ) $ 582 $ 617 b) Attributable to General Partner US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2018 $ 7 $ (6 ) $ 1 $ — $ — $ — $ 4 $ 6 Other comprehensive loss (1) — (2 ) — — — — — (2 ) Other items (3 ) — — — — — — (3 ) Balance at June 30, 2018 $ 4 $ (8 ) $ 1 $ — $ — $ — $ 4 $ 1 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 7 $ (5 ) $ 3 $ (1 ) $ — $ — $ 3 $ 7 Other comprehensive loss — — (1 ) — — — — (1 ) Balance at June 30, 2017 $ 7 $ (5 ) $ 2 $ (1 ) $ — $ — $ 3 $ 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 Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2018 $ 425 $ (339 ) $ 11 $ (14 ) $ (2 ) $ (8 ) $ 314 $ 387 Other comprehensive (loss) income (1) — (159 ) 13 (16 ) (4 ) — 19 (147 ) Other items (188 ) — — — — — — (188 ) Balance at June 30, 2018 $ 237 $ (498 ) $ 24 $ (30 ) $ (6 ) $ (8 ) $ 333 $ 52 US$ MILLIONS Revaluation surplus Foreign currency translation Net investment hedges Cash flow hedges Marketable securities Unrealized actuarial losses Equity accounted investments Accumulated other comprehensive income Balance at January 1, 2017 $ 417 $ (365 ) $ 88 $ (58 ) $ (3 ) $ (9 ) $ 261 $ 331 Other comprehensive income (loss) — 13 (58 ) 10 — — (15 ) (50 ) Balance at June 30, 2017 $ 417 $ (352 ) $ 30 $ (48 ) $ (3 ) $ (9 ) $ 246 $ 281

SIGNIFICANT ACCOUNTING POLICI37

SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2017
Prospective Adoption of New Accounting Pronouncements [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 16
Assets [member]
Prospective Adoption of New Accounting Pronouncements [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 25
Liabilities [member]
Prospective Adoption of New Accounting Pronouncements [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	9
Equity [member]
Prospective Adoption of New Accounting Pronouncements [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 16

SEGMENT INFORMATION (Operating

SEGMENT INFORMATION (Operating Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of operating segments [line items]
Revenues	$ 1,044	$ 934	$ 2,057	$ 1,590
Costs attributed to revenues	(467)	(373)	(876)	(716)
General and administrative costs	(54)	(59)	(112)	(110)
Other income (expense)	(12)	(13)	(17)	14
Interest expense	(125)	(107)	(239)	(201)
Depreciation and amortization	(188)	(206)	(381)	(326)
Deferred taxes	(26)	(18)	(41)	(18)
Mark-to-market on hedging items and other	46	(59)	(179)	(111)
Gain (Loss) on Disposition of Business	0	0	338	0
Share of earnings from associates	1	36	(4)	59	$ 118
Net income attributable to non-controlling interest and preferred unitholders	(94)	(122)	(212)	(146)
Net income (loss) attributable to partnership	125	13	334	35
Utilities
Disclosure of operating segments [line items]
Revenues	589		1,124
Transport
Disclosure of operating segments [line items]
Revenues	341		680
Energy
Disclosure of operating segments [line items]
Revenues	114		253
Reportable segments
Disclosure of operating segments [line items]
Revenues	837	837	1,729	1,569
Costs attributed to revenues	(395)	(375)	(804)	(706)
General and administrative costs	(54)	(59)	(112)	(110)
Adjusted EBITDA	388	403	813	753
Other income (expense)	10	2	30	23
Interest expense	(104)	(110)	(216)	(220)
Funds From Operations	294	295	627	556
Depreciation and amortization	(183)	(186)	(393)	(344)
Deferred taxes	(13)	(5)	(15)	(8)
Mark-to-market on hedging items and other	27	(91)	(223)	(169)
Gain (Loss) on Disposition of Business			338
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	125	13	334	35
Reportable segments | Utilities
Disclosure of operating segments [line items]
Revenues	245	278	517	454
Costs attributed to revenues	(68)	(73)	(137)	(121)
General and administrative costs	0	0	0	0
Adjusted EBITDA	177	205	380	333
Other income (expense)	(8)	(8)	(11)	(7)
Interest expense	(30)	(29)	(61)	(58)
Funds From Operations	139	168	308	268
Depreciation and amortization	(43)	(57)	(101)	(89)
Deferred taxes	(12)	(12)	(27)	(18)
Mark-to-market on hedging items and other	(10)	(12)	(57)	(28)
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	74	87	123	133
Reportable segments | Transport
Disclosure of operating segments [line items]
Revenues	410	395	834	770
Costs attributed to revenues	(237)	(224)	(483)	(434)
General and administrative costs	0	0	0	0
Adjusted EBITDA	173	171	351	336
Other income (expense)	0	1	2	(2)
Interest expense	(40)	(38)	(83)	(77)
Funds From Operations	133	134	270	257
Depreciation and amortization	(85)	(75)	(184)	(151)
Deferred taxes	(1)	2	12	7
Mark-to-market on hedging items and other	(23)	(18)	(62)	(39)
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	24	43	36	74
Reportable segments | Energy
Disclosure of operating segments [line items]
Revenues	137	123	290	265
Costs attributed to revenues	(68)	(60)	(142)	(116)
General and administrative costs	0	0	0	0
Adjusted EBITDA	69	63	148	149
Other income (expense)	3	3	8	6
Interest expense	(18)	(23)	(36)	(50)
Funds From Operations	54	43	120	105
Depreciation and amortization	(38)	(35)	(71)	(68)
Deferred taxes	(1)	5	(3)	0
Mark-to-market on hedging items and other	(20)	(12)	(38)	(19)
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	(5)	1	8	18
Reportable segments | Comm. Infrastructure
Disclosure of operating segments [line items]
Revenues	45	41	88	80
Costs attributed to revenues	(22)	(18)	(42)	(35)
General and administrative costs	0	0	0	0
Adjusted EBITDA	23	23	46	45
Other income (expense)	(1)	(1)	(2)	(1)
Interest expense	(3)	(3)	(6)	(6)
Funds From Operations	19	19	38	38
Depreciation and amortization	(17)	(19)	(37)	(36)
Deferred taxes	0	3	2	5
Mark-to-market on hedging items and other	1	(1)	1	(2)
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	3	2	4	5
Reportable segments | Corporate
Disclosure of operating segments [line items]
Revenues	0	0	0	0
Costs attributed to revenues	0	0	0	0
General and administrative costs	(54)	(59)	(112)	(110)
Adjusted EBITDA	(54)	(59)	(112)	(110)
Other income (expense)	16	7	33	27
Interest expense	(13)	(17)	(30)	(29)
Funds From Operations	(51)	(69)	(109)	(112)
Depreciation and amortization	0	0	0	0
Deferred taxes	1	(3)	1	(2)
Mark-to-market on hedging items and other	79	(48)	(67)	(81)
Gain (Loss) on Disposition of Business			338
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	29	(120)	163	(195)
Contribution from investments in associates
Disclosure of operating segments [line items]
Revenues	(368)	(408)	(791)	(788)
Costs attributed to revenues	211	220	431	411
General and administrative costs	0	0	0	0
Adjusted EBITDA	(157)	(188)	(360)	(377)
Other income (expense)	4	1	4	7
Interest expense	30	44	72	93
Funds From Operations	(123)	(143)	(284)	(277)
Depreciation and amortization	91	91	202	179
Deferred taxes	(3)	(3)	(12)	(1)
Mark-to-market on hedging items and other	34	19	98	40
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	1	36	(4)	59
Net income attributable to non-controlling interest and preferred unitholders	0	0	0	0
Net income (loss) attributable to partnership	0	0	0	0
Attributable to non- controlling interest
Disclosure of operating segments [line items]
Revenues	575	505	1,119	809
Costs attributed to revenues	(283)	(218)	(503)	(421)
General and administrative costs	0	0	0	0
Adjusted EBITDA	292	287	616	388
Other income (expense)	(26)	(16)	(51)	(16)
Interest expense	(51)	(41)	(95)	(74)
Funds From Operations	215	230	470	298
Depreciation and amortization	(96)	(111)	(190)	(161)
Deferred taxes	(10)	(10)	(14)	(9)
Mark-to-market on hedging items and other	(15)	13	(54)	18
Gain (Loss) on Disposition of Business			0
Share of earnings from associates	0	0	0	0
Net income attributable to non-controlling interest and preferred unitholders	(94)	(122)	(212)	(146)
Net income (loss) attributable to partnership	$ 0	$ 0	$ 0	$ 0

SEGMENT INFORMATION (Assets) (D

SEGMENT INFORMATION (Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of operating segments [line items]
Assets	$ 28,830	$ 29,477
Reportable segments
Disclosure of operating segments [line items]
Assets	14,680	16,632
Reportable segments | Utilities
Disclosure of operating segments [line items]
Assets	4,828	6,542
Reportable segments | Transport
Disclosure of operating segments [line items]
Assets	6,457	6,990
Reportable segments | Energy
Disclosure of operating segments [line items]
Assets	3,104	3,134
Reportable segments | Comm. Infrastructure
Disclosure of operating segments [line items]
Assets	1,072	1,049
Reportable segments | Corporate
Disclosure of operating segments [line items]
Assets	(781)	(1,083)
Contribution from investments in associates
Disclosure of operating segments [line items]
Assets	(2,391)	(3,134)
Attributable to non- controlling interest
Disclosure of operating segments [line items]
Assets	12,115	11,668
Working capital adjustment and other
Disclosure of operating segments [line items]
Assets	$ 4,426	$ 4,311

DISPOSITION OF CHILEAN ELECTR40

DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION - Additional Information (Details) - USD ($) $ in Millions	Mar. 15, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method		$ 0		$ 0	$ 1,289	$ 0
Investments accounted for using equity method		4,407			4,407		$ 5,572	$ 4,727
Gain (Loss) on Disposition of Business		0		0	338	0
Current tax expense (income)		46		$ 38	216	$ 50
Chilean electricity transmission operation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest Held In Associate And Joint Venture	27.80%
Proceeds from sales of investments accounted for using equity method	$ 1,300
Investments accounted for using equity method	$ 951	$ 0			0		$ 930
Gain (Loss) on Disposition of Business			$ 338
Transaction Related Costs			11
Current tax expense (income)			129		$ 127
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity			641
Reclassification adjustments on exchange differences on translation, net of tax			$ 35

ACQUISITION OF BUSINESSES - Add

ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)	Jun. 01, 2018	Apr. 04, 2017	Jun. 30, 2018	Dec. 31, 2017
Disclosure of detailed information about business combination [line items]
Goodwill			$ 1,949,000,000	$ 1,301,000,000
Colombian Gas Distribution Operation [Member]
Disclosure of detailed information about business combination [line items]
Profit (loss)			571,000,000
Proportion of ownership interest in subsidiary	16.00%
Total consideration	$ 150,000,000
Equity funded consideration	88,000,000
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			2,000,000
Pre-existing equity interest, percentage	3.00%
Business combinations, pre-existing interest, equity	$ 32,000,000
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination			0
Increase through business combinations, deferred tax liability	76,000,000
Goodwill not deductible tax purposes	76,000,000
Goodwill	770,000,000
Revenue of combined entity as if combination occurred at beginning of period			$ 2,457,000,000
Goodwill expected to be deductible for tax purposes	0
Colombian Gas Distribution Operation [Member] | Consortium
Disclosure of detailed information about business combination [line items]
Total consideration	522,000,000
Equity funded consideration	$ 309,000,000
Brazilian Regulated Gas Transmission Operation [Member]
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary		28.00%
Total consideration		$ 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
Deferred consideration, annual interest accrual		3.35%
Increase through business combinations, deferred tax liability		$ 893,000,000
Goodwill		804,000,000
Goodwill expected to be deductible for tax purposes		0
Brazilian Regulated Gas Transmission Operation [Member] | Consortium
Disclosure of detailed information about business combination [line items]
Total consideration		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]
Total consideration				30,000,000
Cash				9,000,000
Deferred consideration				21,000,000
Goodwill				$ 14,000,000

ACQUISITION OF BUSINESSES - Pur

ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 01, 2018	Dec. 31, 2017	Apr. 04, 2017
Fair value of assets and liabilities acquired
Goodwill	$ 1,949		$ 1,301
Colombian Gas Distribution Operation [Member]
Consideration transferred
Cash		$ 118
Business combinations, pre-existing interest, equity		32
Total consideration		150
Fair value of assets and liabilities acquired
Cash and cash equivalents		21
Accounts receivable and other		275
Property, plant and equipment		487
Intangible assets		17
Goodwill		770
Accounts payable and other		(238)
Deferred income tax and other liabilities		(83)
Non-recourse borrowings		(185)
Net assets acquired before non-controlling interest		1,064
Non-controlling interest		(914)
Net assets acquired		$ 150
Aggregated individually immaterial business combinations
Consideration transferred
Cash			9
Deferred consideration, acquisition-date fair value			21
Total consideration			30
Fair value of assets and liabilities acquired
Accounts receivable and other			28
Property, plant and equipment			104
Goodwill			14
Deferred income tax and other liabilities			(30)
Non-recourse borrowings			(30)
Net assets acquired before non-controlling interest			86
Non-controlling interest			(56)
Net assets acquired			$ 30
Brazilian Regulated Gas Transmission Operation [Member]
Consideration transferred
Cash				$ 1,306
Deferred consideration, acquisition-date fair value				262
Total consideration				1,568
Fair value of assets and liabilities acquired
Cash and cash equivalents				89
Accounts receivable and other				317
Intangible assets				5,515
Goodwill				804
Accounts payable and other				(202)
Deferred income tax and other liabilities				(946)
Net assets acquired before non-controlling interest				5,577
Non-controlling interest				(4,009)
Net assets acquired				$ 1,568

FAIR VALUE OF FINANCIAL INSTR43

FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 893		$ 893		$ 750
Financial liabilities (current and non-current)	309		309		440
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	29	$ (23)	58	$ (28)
Derivative financial assets	456		456		447
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	99	76	47	197
Settlements, fair value measurement, liabilities	18	$ 10	72	$ 40
Derivative financial liabilities	$ 12		$ 12		$ 129

FAIR VALUE OF FINANCIAL INSTR44

FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Financial assets	$ 2,760	$ 2,134
Disclosure of financial liabilities [line items]
Financial liabilities	13,199	12,361
FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	309	440
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	12,890	11,921
FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	811	608
Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	82	142
Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	1,867	1,384
Corporate borrowings
Disclosure of financial liabilities [line items]
Financial liabilities	1,256	2,101
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	1,256	2,101
Non-recourse borrowings (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities	9,689	8,063
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	9,689	8,063
Accounts payable and other
Disclosure of financial liabilities [line items]
Financial liabilities	1,026	864
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	1,026	864
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	1,208	1,313
Financial liabilities (current and non-current) | FVTPL (Fair Value)
Disclosure of financial liabilities [line items]
Financial liabilities	309	440
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	899	873
Cash and cash equivalents
Disclosure of financial assets [line items]
Financial assets	782	374
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	782	374
Accounts receivable and other
Disclosure of financial assets [line items]
Financial assets	949	838
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	949	838
Financial assets (current and non-current)
Disclosure of financial assets [line items]
Financial assets	838	837
Financial assets (current and non-current) | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	668	608
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	34	57
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	136	172
Marketable securities
Disclosure of financial assets [line items]
Financial assets	191	85
Marketable securities | FVTPL (Fair Value)
Disclosure of financial assets [line items]
Financial assets	143	0
Marketable securities | Available for sale securities (Fair Value through OCI)
Disclosure of financial assets [line items]
Financial assets	48	85
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost)
Disclosure of financial assets [line items]
Financial assets	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTR45

FAIR VALUE OF FINANCIAL INSTRUMENTS- Allocation of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	$ 13,199	$ 12,361
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	522	464
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	$ 54	$ 146

FAIR VALUE OF FINANCIAL INSTR46

FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Financial assets, Carrying	$ 2,760	$ 2,134
Financial assets, Fair Value	2,760	2,134
Disclosure of financial liabilities [line items]
Preferred shares	20	20
Financial liabilities, Carrying	13,199	12,361
Financial liabilities, Fair Value	13,493	12,702
Corporate borrowings
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	1,256	2,101
Financial liabilities, Fair Value	1,261	2,113
Non-recourse borrowings
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	9,689	8,063
Financial liabilities, Fair Value	9,978	8,392
Accounts payable and other (current and non-current)
Disclosure of financial liabilities [line items]
Financial liabilities, Carrying	1,026	864
Financial liabilities, Fair Value	1,026	864
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	1,208	1,313
Financial liabilities, Fair Value	1,208	1,313
Cash and cash equivalents
Disclosure of financial assets [line items]
Financial assets, Carrying	782	374
Financial assets, Fair Value	782	374
Accounts receivable and other
Disclosure of financial assets [line items]
Financial assets, Carrying	949	838
Financial assets, Fair Value	949	838
Financial assets (current and non-current)
Disclosure of financial assets [line items]
Financial assets, Carrying	838	837
Financial assets, Fair Value	838	837
Marketable securities
Disclosure of financial assets [line items]
Financial assets, Carrying	191	85
Financial assets, Fair Value	$ 191	$ 85

FAIR VALUE OF FINANCIAL INSTR47

FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques and Significant Inputs (Details) - Recurring fair value measurement - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 893	$ 750
Financial liabilities (current and non-current)	309	440
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)	46	196
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)	161	155
Other contracts | Level 3 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	102	89
Marketable securities | Level 1
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	191	85
Marketable securities | Level 1 | Quoted bid prices
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	191	85
Marketable securities | Level 2
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Marketable securities | Level 3
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Foreign currency forward contracts | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	305	236
Interest rate swaps & other | Level 2 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	348	381
Other contracts | Level 3 | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 49	$ 48

FAIR VALUE OF FINANCIAL INSTR48

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - Recurring fair value measurement - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 893	$ 750
Financial liabilities (current and non-current)	309	440
Level 1 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	191	85
Level 1 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Level 2 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Level 2 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	653	617
Level 3 | Marketable securities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	0
Level 3 | Financial assets (current and non-current)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	49	48
Financial liabilities (current and non-current) | Level 1
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	0	0
Financial liabilities (current and non-current) | Level 2
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	207	351
Financial liabilities (current and non-current) | Level 3
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities (current and non-current)	$ 102	$ 89

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	$ 9,937
Ending balance	10,221	$ 9,937
Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	4,219
Ending balance	4,763	4,219
Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,843
Ending balance	2,652	2,843
Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,875
Ending balance	2,806	2,875
Gross Carrying Amount:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	8,757	7,637
Additions, net of disposals	306	548
Non-cash disposals	(44)	(14)
Acquisitions through business combinations	487	100
Net foreign currency exchange differences	(264)	486
Ending balance	9,242	8,757
Gross Carrying Amount: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	3,471	2,895
Additions, net of disposals	230	349
Non-cash disposals	(23)	0
Acquisitions through business combinations	487	0
Net foreign currency exchange differences	(86)	227
Ending balance	4,079	3,471
Gross Carrying Amount: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,657	2,362
Additions, net of disposals	28	104
Non-cash disposals	(21)	0
Acquisitions through business combinations	0	0
Net foreign currency exchange differences	(130)	191
Ending balance	2,534	2,657
Gross Carrying Amount: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,629	2,380
Additions, net of disposals	48	95
Non-cash disposals	0	(14)
Acquisitions through business combinations	0	100
Net foreign currency exchange differences	(48)	68
Ending balance	2,629	2,629
Accumulated depreciation:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(1,580)	(1,158)
Non-cash disposals		40
Net foreign currency exchange differences	49	(85)
Disposals	15	5
Depreciation expense	(208)	(382)
Ending balance	(1,724)	(1,580)
Accumulated depreciation: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(510)	(383)
Non-cash disposals		19
Net foreign currency exchange differences	6	(28)
Disposals	2	0
Depreciation expense	(70)	(118)
Ending balance	(572)	(510)
Accumulated depreciation: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(687)	(517)
Non-cash disposals		21
Net foreign currency exchange differences	35	(44)
Disposals	13	0
Depreciation expense	(73)	(147)
Ending balance	(712)	(687)
Accumulated depreciation: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	(383)	(258)
Non-cash disposals		0
Net foreign currency exchange differences	8	(13)
Disposals	0	5
Depreciation expense	(65)	(117)
Ending balance	(440)	(383)
Accumulated fair value adjustments:
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	2,760	2,177
Net foreign currency exchange differences	(57)	165
Fair value adjustments		418
Ending balance	2,703	2,760
Accumulated fair value adjustments: | Utilities
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	1,258	1,043
Net foreign currency exchange differences	(2)	78
Fair value adjustments		137
Ending balance	1,256	1,258
Accumulated fair value adjustments: | Transport
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	873	782
Net foreign currency exchange differences	(43)	67
Fair value adjustments		24
Ending balance	830	873
Accumulated fair value adjustments: | Energy
Reconciliation of changes in property, plant and equipment [abstract]
Beginning balance	629	352
Net foreign currency exchange differences	(12)	20
Fair value adjustments		257
Ending balance	$ 617	$ 629

INTANGIBLE ASSETS - Net Amounts

INTANGIBLE ASSETS - Net Amounts (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	$ 8,868	$ 9,894
Cost
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	9,555	10,470	$ 10,292	$ 4,732
Accumulated amortization
Disclosure of detailed information about intangible assets [line items]
Net intangible assets	$ (687)	$ (576)	$ (418)	$ (267)

INTANGIBLE ASSETS - Cash Genera

INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of information for cash-generating units [line items]
Total	$ 8,868	$ 9,894
Brazilian Regulated Gas Transmission Operation [Member]
Disclosure of information for cash-generating units [line items]
Total	4,314	5,134
Australian regulated terminal
Disclosure of information for cash-generating units [line items]
Total	1,852	1,957
Peruvian toll roads
Disclosure of information for cash-generating units [line items]
Total	1,137	1,144
Chilean toll roads
Disclosure of information for cash-generating units [line items]
Total	1,010	1,100
U.K. port operation
Disclosure of information for cash-generating units [line items]
Total	283	289
Indian toll roads
Disclosure of information for cash-generating units [line items]
Total	114	130
Other
Disclosure of information for cash-generating units [line items]
Total	$ 158	$ 140

INTANGIBLE ASSETS - Reconciliat

INTANGIBLE ASSETS - Reconciliation (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of changes in intangible assets other than goodwill
Cost at beginning of the year	$ 9,894
Cost at end of year	8,868
Cost
Disclosure of detailed information about intangible assets [line items]
Acquisitions through business combinations, intangible assets and goodwill	17	$ 5,539
Reconciliation of changes in intangible assets other than goodwill
Cost at beginning of the year	10,470	4,732
Additions, net of disposals	32	46
Foreign currency translation	(964)	(25)
Cost at end of year	$ 9,555	$ 10,292

INTANGIBLE ASSETS - Accumulated

INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disclosure of detailed information about intangible assets [line items]
Cost at beginning of the year	$ 9,894
Cost at end of year	8,868
Accumulated amortization
Disclosure of detailed information about intangible assets [line items]
Cost at beginning of the year	(576)	$ (267)
Disposals, intangible assets other than goodwill	0	(1)
Amortization	(173)	(143)
Foreign currency translation	62	(9)
Cost at end of year	$ (687)	$ (418)

INVESTMENT IN ASSOCIATES AND 54

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Reconciliation of changes in associates and joint ventures
Balance at beginning of year			$ 5,572	$ 4,727	$ 4,727
Share of earnings for the year	$ 1	$ 36	(4)	$ 59	118
Foreign currency translation and other			(325)		167
Share of other comprehensive income from associates and joint ventures, other than foreign exchange differences			63		183
Distributions			(20)		(66)
Disposition of interest			(951)		(177)
Acquisitions			72		620
Balance at end of year	$ 4,407		$ 4,407		$ 5,572

INVESTMENT IN ASSOCIATES AND 55

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) - USD ($)	Mar. 15, 2018	Dec. 31, 2017	Aug. 31, 2017	May 31, 2017	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method					$ 0		$ 0	$ 1,289,000,000	$ 0
Gain (Loss) on Disposition of Business					$ 0		$ 0	338,000,000	$ 0
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests								951,000,000		$ 177,000,000
Acquisitions								72,000,000		620,000,000
Chilean electricity transmission operation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method	$ 1,300,000,000
Gain (Loss) on Disposition of Business						$ 338,000,000
Gain (Loss) on Disposition of Business, Net of Tax						209,000,000
Reclassification adjustments on exchange differences on translation, net of tax						$ 35,000,000
Brazilian toll roads
Disclosure Of Associates And Joint Ventures [Line Items]
Gain (loss) on investment			$ 0
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests										177,000,000
Acquisitions								$ 0		$ 349,000,000
Ownership Interest		45.00%								8.00%
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisitions				$ 200,000,000

INVESTMENT IN ASSOCIATES AND 56

INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES (Geographic Information) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 15, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [line items]
Investments accounted for using equity method	$ 4,407		$ 5,572	$ 4,727
Brazilian toll roads
Disclosure of geographical areas [line items]
Investments accounted for using equity method	1,467		1,715
North American natural gas transmission operation
Disclosure of geographical areas [line items]
Investments accounted for using equity method	1,034		1,013
European Telecommunications Infrastructure Operations [Member]
Disclosure of geographical areas [line items]
Investments accounted for using equity method	638		614
Brazillian Rail Business [Member]
Disclosure of geographical areas [line items]
Investments accounted for using equity method	375		436
Australian Ports Operation [Member]
Disclosure of geographical areas [line items]
Investments accounted for using equity method	176		191
Chilean electricity transmission operation [Member]
Disclosure of geographical areas [line items]
Investments accounted for using equity method	0	$ 951	930
Aggregated Individually Immaterial Associates And Joint Ventures [Member]
Disclosure of geographical areas [line items]
Investments accounted for using equity method	$ 717		$ 673

INVESTMENT IN ASSOCIATES AND 57

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]
Assets	$ 28,830	$ 29,477
Total liabilities	(16,554)	(16,003)
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Assets	31,412	40,375
Total liabilities	(15,950)	(20,575)
Total Net Assets	$ 15,462	$ 19,800

INVESTMENT IN ASSOCIATES AND 58

INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Income Statement Impact of Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	$ 1,044	$ 934	$ 2,057	$ 1,590
Net income	219	135	546	181
Share of profit (loss) of associates and joint ventures accounted for using equity method	1	36	(4)	59	$ 118
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Revenues	1,406	1,629	2,973	3,074
Net income	32	122	96	181
Share of profit (loss) of associates and joint ventures accounted for using equity method, before reclassification	1	36	31	59
Reclassification adjustments on exchange differences on translation, net of tax	$ 0	$ 0	$ (35)	$ 0

BORROWINGS - Additional Informa

BORROWINGS - Additional Information (Details) $ in Millions, $ in Millions	May 15, 2018USD ($)	Jun. 30, 2018USD ($)extension	Dec. 31, 2017USD ($)	Apr. 17, 2017CAD ($)	Feb. 22, 2017CAD ($)
Corporate revolving credit facility
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity		$ 1,975
Subsidiary and corporate borrowings		0	$ 789
Letter of credit outstanding amount		$ 59	106
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 February 22, 2024
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 228	239
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | CAD
Disclosure of detailed information about borrowings [line items]
Face amount				$ 400	$ 300
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate		3.30%		3.30%
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate				3.10%
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate				4.00%	4.10%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		$ 305	318
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate		3.30%			3.30%
Revolving credit facility with Brookfield
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity		$ 500
Subsidiary and corporate borrowings		$ 0	0
Borrowings, number of extensions | extension		4
Revolving credit facility with Brookfield | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis		2.00%
Commitment fees		$ 0
Corporate borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		1,256	2,101
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities		(56)
Non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings		9,689	$ 8,063
Increase in borrowings		1,600
Increase (decrease) through financing cash flows, liabilities arising from financing activities		$ 100
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member]
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 1,500
Debt Instrument, Period Term	5 years
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member] | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	7.10%

BORROWINGS - Corporate Borrowin

BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Apr. 17, 2017	Feb. 22, 2017
Corporate revolving credit facility
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity	$ 1,975
Subsidiary and corporate borrowings	0	$ 789
Letter of credit outstanding amount	$ 59	106
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	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 30, 2018
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 95	99
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	$ 285	298
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	$ 343	358
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	$ 228	239
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	$ 305	318
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%
Revolving credit facility with Brookfield
Disclosure of detailed information about borrowings [line items]
Credit facility, maximum borrowing capacity	$ 500
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%
Corporate borrowings
Disclosure of detailed information about borrowings [line items]
Subsidiary and corporate borrowings	$ 1,256	$ 2,101

BORROWINGS - Non-Recourse Borro

BORROWINGS - Non-Recourse Borrowings (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Current Non-recourse Borrowings And Current Portion of Non-current Non-recourse Borrowings	$ 226	$ 364
Non-current Portion Of Non-current Non-recourse Borrowings	9,463	7,699
Non-recourse borrowings
Disclosure of detailed information about borrowings [line items]
Total	$ 9,689	$ 8,063

CAPITAL MANAGEMENT - Invested C

CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Disclosure of objectives, policies and processes for managing capital [line items]
Total partnership capital	$ 12,276	$ 13,607	$ 13,474	$ 12,624	$ 9,774	$ 9,644
Non-controlling interest - in operating subsidiaries	(5,125)		(5,875)
Deficit	842		1,366
Accumulated other comprehensive income	(120)		(1,257)
Ownership changes	(109)		(109)
Invested Capital	$ 7,764	$ 7,760	$ 7,599	$ 6,618	$ 6,613	$ 6,387
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	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Changes in Invested capital [Roll Forward]
Opening balance	$ 7,760	$ 6,613	$ 7,599	$ 6,387
Issuance of preferred units	0	0	157	220
Issuance of limited partnership units and redeemable partnership units	4	5	8	11
Ending balance	7,764	6,618	7,764	6,618
Weighted Average Invested Capital	$ 7,760	$ 6,613	$ 7,738	$ 6,578

SUBSIDIARY PUBLIC ISSUERS - Add

SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) - CAD ($) $ in Millions	Oct. 30, 2015	Jun. 30, 2018	Apr. 17, 2017	Feb. 22, 2017	Mar. 11, 2015
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%		3.30%
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | CAD
Disclosure of information about consolidated structured entities [line items]
Face amount			$ 400	$ 300
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%	3.30%
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			3.10%
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%	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%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024
Disclosure of information about consolidated structured entities [line items]
Face amount			$ 400
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, Public - Canadian - Maturing February 22, 2024
Disclosure of information about consolidated structured entities [line items]
Face amount				$ 300
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				4.10%
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
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
Debt Instrument, 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
Debt Instrument, 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
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%

SUBSIDIARY PUBLIC ISSUERS - Fin

SUBSIDIARY PUBLIC ISSUERS - Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Statement of comprehensive income [abstract]
Revenues	$ 1,044	$ 934	$ 2,057	$ 1,590
Net income attributable to partnership	125	13	334	35
Statement of financial position [abstract]
Current assets	2,135		2,135		$ 1,512
Non-current assets	26,695		26,695		27,965
Current liabilities	1,470		1,470		1,564
Non-current liabilities	15,084		15,084		14,439
Non-controlling interest—Redeemable Partnership Units held by Brookfield	1,832		1,832		2,012
Non-controlling interests—in operating subsidiaries	5,125		5,125		5,875
Preferred unitholders	752		752		595
Our partnership
Statement of comprehensive income [abstract]
Revenues	0	0	0	0
Net income attributable to partnership	64	(10)	186	(14)
Statement of financial position [abstract]
Current assets	0		0		0
Non-current assets	5,244		5,244		5,514
Current liabilities	0		0		0
Non-current liabilities	0		0		0
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0		0		0
Non-controlling interests—in operating subsidiaries	0		0		0
Preferred unitholders	0		0		0
The Issuers
Statement of comprehensive income [abstract]
Revenues	0	0	0	0
Net income attributable to partnership	0	0	0	0
Statement of financial position [abstract]
Current assets	0		0		0
Non-current assets	0		0		0
Current liabilities	0		0		0
Non-current liabilities	1,256		1,256		1,313
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0		0		0
Non-controlling interests—in operating subsidiaries	0		0		0
Preferred unitholders	0		0		0
Subsidiaries of our partnership other than the Issuers
Statement of comprehensive income [abstract]
Revenues	0	0	0	0
Net income attributable to partnership	125	13	334	35
Statement of financial position [abstract]
Current assets	0		0		0
Non-current assets	6,567		6,567		5,987
Current liabilities	0		0		0
Non-current liabilities	0		0		0
Non-controlling interest—Redeemable Partnership Units held by Brookfield	0		0		0
Non-controlling interests—in operating subsidiaries	0		0		0
Preferred unitholders	0		0		0
Consolidating adjustments
Statement of comprehensive income [abstract]
Revenues	1,044	934	2,057	1,590
Net income attributable to partnership	(64)	$ 10	(186)	$ 14
Statement of financial position [abstract]
Current assets	2,135		2,135		1,512
Non-current assets	14,884		14,884		16,464
Current liabilities	1,470		1,470		1,564
Non-current liabilities	13,828		13,828		13,126
Non-controlling interest—Redeemable Partnership Units held by Brookfield	1,832		1,832		2,012
Non-controlling interests—in operating subsidiaries	5,125		5,125		5,875
Preferred unitholders	$ 752		$ 752		$ 595

REVENUES (Details)

REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of operating segments [line items]
Revenue	$ 1,044	$ 934	$ 2,057	$ 1,590
Utilities
Disclosure of operating segments [line items]
Revenue	589		1,124
Transport
Disclosure of operating segments [line items]
Revenue	341		680
Energy
Disclosure of operating segments [line items]
Revenue	$ 114		$ 253

REVENUES REVENUES (Geographic I

REVENUES REVENUES (Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of geographical areas [line items]
Revenues	$ 1,044	$ 934	$ 2,057	$ 1,590
BRAZIL
Disclosure of geographical areas [line items]
Revenues	278		583
AUSTRALIA
Disclosure of geographical areas [line items]
Revenues	288		572
UNITED KINGDOM
Disclosure of geographical areas [line items]
Revenues	166		325
CANADA
Disclosure of geographical areas [line items]
Revenues	47		124
UNITED STATES
Disclosure of geographical areas [line items]
Revenues	42		83
CHILE
Disclosure of geographical areas [line items]
Revenues	43		88
COLOMBIA
Disclosure of geographical areas [line items]
Revenues	127		171
Aggregated Individually Immaterial Geographical Areas [Member]
Disclosure of geographical areas [line items]
Revenues	$ 53		$ 111

PARTNERSHIP CAPITAL - Additiona

PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions	Jan. 23, 2018USD ($)	Jan. 23, 2018CAD ($)$ / shares	Jan. 26, 2017USD ($)shares	Jan. 26, 2017CAD ($)$ / sharesshares	Sep. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2018USD ($)shares	Jun. 30, 2017USD ($)shares	Jun. 30, 2018USD ($)dayshares	Jun. 30, 2017USD ($)shares	Dec. 31, 2017shares
Schedule of Partnership Units [Line Items]
Partnership units issued, net of issuance costs | $						$ 4	$ 5	$ 8	$ 11
Share issue related cost (less than) | $					$ 28
Volume weighted average of trading price, number of trading days | day								5
Preferred Unitholders Capital [Member] | Series 9 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash								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 [Member] | Series 7 Preferred Units
Schedule of Partnership Units [Line Items]
Issued for cash			12	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 | $			$ 4
Special General Partner
Schedule of Partnership Units [Line Items]
Weighted average number of shares outstanding						1.6	1.6	1.6	1.6
Special General Partner | Issued capital [member]
Schedule of Partnership Units [Line Items]
Issued for cash								0		0
Limited Partners 1 [Member]
Schedule of Partnership Units [Line Items]
Weighted average number of shares outstanding						276.7	259.6	276.6	259.5
Limited Partners 1 [Member] | Issued capital [member]
Schedule of Partnership Units [Line Items]
Issued for cash					16.6			0.2		17.2
Number of share issued, price per share | $ / shares					$ 42
Partnership units issued, net of issuance costs | $					$ 700
Dividend reinvestment plan, unit issued (less than)								1	1
Dividend reinvestment plan, proceeds | $								$ 8	$ 11
Special General Partner and Limited Partner | Issued capital [member]
Schedule of Partnership Units [Line Items]
Issued for cash								0.2		17.2
Non-controlling Interest - Redeemable Partnership Units [Member] | Issued capital [member]
Schedule of Partnership Units [Line Items]
Issued for cash					7.4			0		7.4
Partnership units issued, net of issuance costs | $					$ 300
Weighted average number of shares outstanding						115.8	108.4	115.8	108.4

PARTNERSHIP CAPITAL - Capital C

PARTNERSHIP CAPITAL - Capital Categories (Details) - USD ($) shares in Millions, $ in Millions	Jan. 26, 2017	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			$ 13,607	$ 9,774	$ 13,474	$ 9,644	$ 9,644
Changes in equity [abstract]
Unit issuance			4	5	8	11
Balance as			12,276	12,624	12,276	12,624	13,474
Limited Partners 1 [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			4,977	4,488	4,967	4,611	4,611
Changes in equity [abstract]
Unit issuance			4	5	8	11
Balance as			4,545	4,253	4,545	4,253	4,967
Non-controlling Interest - Redeemable Partnership Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			2,014	1,805	2,012	1,860	1,860
Changes in equity [abstract]
Balance as			$ 1,832	1,705	1,832	1,705	2,012
Issued capital [member] | Special General Partner and Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as					$ 4,926	$ 4,234	$ 4,234
Changes in equity [abstract]
Opening balance					278.2	261	261
Issued for cash					0.2		17.2
Ending balance			278.4		278.4		278.2
Unit issuance					$ 8		$ 692
Balance as			$ 4,934		4,934		4,926
Issued capital [member] | 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
Ending balance			1.6		1.6		1.6
Unit issuance					$ 0		$ 0
Balance as			$ 19		19		19
Issued capital [member] | Limited Partners 1 [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			$ 4,911	4,221	$ 4,907	$ 4,215	$ 4,215
Changes in equity [abstract]
Opening balance					276.6	259.4	259.4
Issued for cash		16.6			0.2		17.2
Ending balance			276.8		276.8		276.6
Unit issuance			$ 4	5	$ 8	$ 11	$ 692
Balance as			4,915	4,226	4,915	4,226	4,907
Issued capital [member] | Non-controlling Interest - Redeemable Partnership Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			$ 2,078	1,778	$ 2,078	$ 1,778	$ 1,778
Changes in equity [abstract]
Opening balance					115.8	108.4	108.4
Issued for cash		7.4			0		7.4
Ending balance			115.8		115.8		115.8
Unit issuance					$ 0		$ 300
Balance as			$ 2,078	1,778	2,078	$ 1,778	2,078
Preferred Unitholders Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as			$ 752	595	$ 595	$ 375	$ 375
Changes in equity [abstract]
Opening balance					32	20	20
Ending balance			40		40		32
Balance as			$ 752	$ 595	$ 752	$ 595	$ 595
Series 9 Preferred Units | Preferred Unitholders Capital [Member]
Changes in equity [abstract]
Issued for cash					8
Unit issuance					$ 157
Series 7 Preferred Units | Preferred Unitholders Capital [Member]
Changes in equity [abstract]
Issued for cash	12						12
Unit issuance							$ 220

DISTRIBUTIONS (Details)

DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of classes of share capital [line items]
Partnership distributions	$ (219)	$ (188)	$ (438)	$ (376)
Preferred Unitholders Capital [Member]
Disclosure of classes of share capital [line items]
Partnership distributions	$ 10	$ 8	$ 19	$ 14
Partnership distributions (usd per share)	$ 0.25	$ 0.25	$ 0.48	$ 0.49
Partnership Unitholders Excluding Special General Partner
Disclosure of classes of share capital [line items]
Partnership distributions	$ 185	$ 160	$ 370	$ 320
Partnership distributions (usd per share)	$ 0.47	$ 0.435	$ 0.94	$ 0.87
Increase in dividends payable per share, percent	8.00%		8.00%
Special General Partner
Disclosure of classes of share capital [line items]
Partnership distributions	$ 34	$ 28	$ 68	$ 56

ACCUMULATED OTHER COMPREHENSI71

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	$ 13,607	$ 13,474	$ 9,774	$ 13,474	$ 9,644
Other comprehensive income (loss)	(1,049)		(335)	(1,017)	(269)
Other items				0
Current tax expense (income)	46		38	216	50
Balance as	12,276	13,607	12,624	12,276	12,624
Chilean electricity transmission operation [Member]
Disclosure of analysis of other comprehensive income by item [line items]
Current tax expense (income)		129		127
Limited Partners 1 [Member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	4,977	4,967	4,488	4,967	4,611
Other comprehensive income (loss)	(363)		(111)	(347)	(119)
Balance as	4,545	4,977	4,253	4,545	4,253
Limited Partners 1 [Member] | Accumulated other comprehensive income [member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	430	864	728	864	736
Other comprehensive income (loss)	(363)		(111)	(347)	(119)
Other items				(450)
Balance as	67	430	617	67	617
Limited Partners 1 [Member] | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		976		976	957
Other comprehensive income (loss)				0	0
Other items				(450)
Balance as	526		957	526	957
Limited Partners 1 [Member] | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(835)		(835)	(891)
Other comprehensive income (loss)				(380)	30
Other items				0
Balance as	(1,215)		(861)	(1,215)	(861)
Limited Partners 1 [Member] | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		28		28	215
Other comprehensive income (loss)				34	(138)
Other items				0
Balance as	62		77	62	77
Limited Partners 1 [Member] | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(26)		(26)	(130)
Other comprehensive income (loss)				(37)	24
Other items				0
Balance as	(63)		(106)	(63)	(106)
Limited Partners 1 [Member] | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0		0	(4)
Other comprehensive income (loss)				(8)	2
Other items				0
Balance as	(8)		(2)	(8)	(2)
Limited Partners 1 [Member] | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(27)		(27)	(30)
Other comprehensive income (loss)				0	0
Other items				0
Balance as	(27)		(30)	(27)	(30)
Limited Partners 1 [Member] | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		748		748	619
Other comprehensive income (loss)				44	(37)
Other items				0
Balance as	792		582	792	582
General Partner 1 [Member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	25	25	27	25	27
Other comprehensive income (loss)	(2)		(1)	(2)	(1)
Balance as	22	25	26	22	26
General Partner 1 [Member] | Accumulated other comprehensive income [member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	3	6	7	6	7
Other comprehensive income (loss)	(2)		(1)	(2)	(1)
Other items				(3)
Balance as	1	3	6	1	6
General Partner 1 [Member] | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		7		7	7
Other comprehensive income (loss)					0
Other items				(3)
Balance as	4		7	4	7
General Partner 1 [Member] | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(6)		(6)	(5)
Other comprehensive income (loss)				(2)	0
Other items				0
Balance as	(8)		(5)	(8)	(5)
General Partner 1 [Member] | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		1		1	3
Other comprehensive income (loss)				0	(1)
Other items				0
Balance as	1		2	1	2
General Partner 1 [Member] | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0		0	(1)
Other comprehensive income (loss)					0
Other items				0
Balance as	0		(1)	0	(1)
General Partner 1 [Member] | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0		0	0
Other comprehensive income (loss)					0
Other items				0
Balance as	0		0	0	0
General Partner 1 [Member] | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		0		0	0
Other comprehensive income (loss)					0
Other items				0
Balance as	0		0	0	0
General Partner 1 [Member] | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		4		4	3
Other comprehensive income (loss)					0
Other items				0
Balance as	4		3	4	3
Non-controlling Interest - Redeemable Partnership Units [Member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	2,014	2,012	1,805	2,012	1,860
Other comprehensive income (loss)	(152)		(46)	(147)	(50)
Balance as	1,832	2,014	1,705	1,832	1,705
Non-controlling Interest - Redeemable Partnership Units [Member] | Accumulated other comprehensive income [member]
Disclosure of analysis of other comprehensive income by item [line items]
Balance as	204	387	327	387	331
Other comprehensive income (loss)	(152)		(46)	(147)	(50)
Other items				(188)
Balance as	52	204	281	52	281
Non-controlling Interest - Redeemable Partnership Units [Member] | Revaluation Surplus
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		425		425	417
Other comprehensive income (loss)				0	0
Other items				(188)
Balance as	237		417	237	417
Non-controlling Interest - Redeemable Partnership Units [Member] | Foreign Currency Translation
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(339)		(339)	(365)
Other comprehensive income (loss)				(159)	13
Other items				0
Balance as	(498)		(352)	(498)	(352)
Non-controlling Interest - Redeemable Partnership Units [Member] | Net Investment Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		11		11	88
Other comprehensive income (loss)				13	(58)
Other items				0
Balance as	24		30	24	30
Non-controlling Interest - Redeemable Partnership Units [Member] | Cash Flow Hedges
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(14)		(14)	(58)
Other comprehensive income (loss)				(16)	10
Other items				0
Balance as	(30)		(48)	(30)	(48)
Non-controlling Interest - Redeemable Partnership Units [Member] | Available for sale
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(2)		(2)	(3)
Other comprehensive income (loss)				(4)	0
Other items				0
Balance as	(6)		(3)	(6)	(3)
Non-controlling Interest - Redeemable Partnership Units [Member] | Unrealized Actuarial Losses
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		(8)		(8)	(9)
Other comprehensive income (loss)				0	0
Other items				0
Balance as	(8)		(9)	(8)	(9)
Non-controlling Interest - Redeemable Partnership Units [Member] | Equity accounted investments
Disclosure of analysis of other comprehensive income by item [line items]
Balance as		$ 314		314	261
Other comprehensive income (loss)				19	(15)
Other items				0
Balance as	$ 333		$ 246	$ 333	$ 246

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Directors' fees (less than)	$ 1	$ 1	$ 1	$ 1
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	52	57	$ 108	105
Amounts payable, related party transactions	52		52		$ 64
Amounts payable, reimbursements	2		2		0
Brookfield
Disclosure of transactions between related parties [line items]
Deposit balance	1		1		1
Earned interest on deposits	1	1	1	1
Subsidiary and corporate borrowings	0		0		0
Subsidiary of Common Parent (Brookfield)
Disclosure of transactions between related parties [line items]
Services received, related party transactions	1	1	1	1
Amounts payable, related party transactions	73		73		75
Amounts receivable, related party transactions	$ 20		$ 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	8.50%		8.50%
Subsidiary of Common Parent (Brookfield) | Bottom of range
Disclosure of transactions between related parties [line items]
Amounts payable, related party transactions, interest rate	3.80%		3.80%
Subsidiary of Common Parent (Brookfield) | Brookfield Office Properties Inc.
Disclosure of transactions between related parties [line items]
Services received, related party transactions	$ 1	1	$ 2	1
Revenue from rendering of services, related party transactions	2	1	4	3
Subsidiary of Common Parent (Brookfield) | Brookfield Renewable Partners L.P.
Disclosure of transactions between related parties [line items]
Services received, related party transactions	3	0	6	0
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	1	$ 0	2	$ 0
Revolving credit facility with Brookfield
Disclosure of transactions between related parties [line items]
Credit facility, maximum borrowing capacity	500		500
Subsidiary and corporate borrowings	$ 0		$ 0		$ 0