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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Cash Flows Impact of Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities $ 2,143 $ 1,362 $ 1,481
Cash used by investing activities (11,372) (5,564) (5,721)
Cash from financing activities 9,542 4,418 3,814
Change during the year 313 216 (426)
Utilities      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 108 380 433
Cash used by investing activities (1,109) 6,189 (803)
Cash from financing activities 1,548 (6,716) 494
Change during the year 547 (147) 124
Other Ownership Interests 471 (106) 102
Partnership's Share 76 (41) 22
Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 692 776 1,000
Cash used by investing activities (852) (1,018) (1,673)
Cash from financing activities 11 369 1,121
Change during the year (149) 127 448
Other Ownership Interests (76) 77 370
Partnership's Share (73) 50 78
Energy      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 357 320 261
Cash used by investing activities (267) (288) (171)
Cash from financing activities (95) (46) (77)
Change during the year (5) (14) 13
Other Ownership Interests (3) (10) 6
Partnership's Share (2) (4) 7
Data Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 531 323 338
Cash used by investing activities (2,707) (305) (226)
Cash from financing activities 2,201 19 (57)
Change during the year 25 37 55
Other Ownership Interests 30 29 44
Partnership's Share (5) 8 11
Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 0 7 1
Cash used by investing activities 0 (7) (10)
Cash from financing activities 0 0 4
Change during the year 0 0 (5)
Other Ownership Interests 0 0 (3)
Partnership's Share 0 0 (2)
Associates and Joint Ventures      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 1,688 1,806 2,033
Cash used by investing activities (4,935) 4,571 (2,883)
Cash from financing activities 3,665 (6,374) 1,485
Change during the year 418 3 635
Other Ownership Interests 422 (10) 519
Partnership's Share $ (4) $ 13 $ 116