INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Cash Flows Impact of Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	$ 1,362	$ 1,481	$ 753
Cash used by investing activities	(5,564)	(5,721)	(1,058)
Cash from financing activities	4,418	3,814	899
Change during the year	216	(426)	594
Utilities
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	380	433	352
Cash used by investing activities	6,189	(803)	(311)
Cash from financing activities	(6,716)	494	(21)
Change during the year	(147)	124	20
Other Ownership Interests	(106)	102	12
Partnership's Share	(41)	22	8
Transport
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	776	1,000	675
Cash used by investing activities	(1,018)	(1,673)	(1,783)
Cash from financing activities	369	1,121	969
Change during the year	127	448	(139)
Other Ownership Interests	77	370	(122)
Partnership's Share	50	78	(17)
Energy
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	320	261	152
Cash used by investing activities	(288)	(171)	(174)
Cash from financing activities	(46)	(77)	15
Change during the year	(14)	13	(7)
Other Ownership Interests	(10)	6	(4)
Partnership's Share	(4)	7	(3)
Data Infrastructure [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	323	338	325
Cash used by investing activities	(305)	(226)	(323)
Cash from financing activities	19	(57)	(83)
Change during the year	37	55	(81)
Other Ownership Interests	29	44	(63)
Partnership's Share	8	11	(18)
Corporate
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	7	1
Cash used by investing activities	(7)	(10)
Cash from financing activities	0	4
Change during the year	0	(5)
Other Ownership Interests	0	(3)
Partnership's Share	0	(2)
Associates and Joint Ventures
Disclosure Of Associates And Joint Ventures [Line Items]
Cash from operating activities	1,806	2,033	1,504
Cash used by investing activities	4,571	(2,883)	(2,591)
Cash from financing activities	(6,374)	1,485	880
Change during the year	3	635	(207)
Other Ownership Interests	(10)	519	(177)
Partnership's Share	$ 13	$ 116	$ (30)

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Increase (decrease) in cash and cash equivalents before effect of exchange rate changes, Portion Attributable to Other Ownership Interests

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Increase (decrease) in cash and cash equivalents before effect of exchange rate changes, Portion Attributable to Partnership's share

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The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents.

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The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]

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The increase (decrease) in cash and cash equivalents before the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents]

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