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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Cash Flows Impact of Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities $ 2,530 $ 2,143 $ 1,362
Cash used by investing activities (4,609) (11,372) (5,564)
Cash from financing activities 2,126 9,542 4,418
Change during the year 47 313 216
Total      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 2,603 1,688 1,806
Cash used by investing activities (2,785) (4,935) 4,571
Cash from financing activities 978 3,665 (6,374)
Change during the year 796 418 3
Other Ownership Interests 681 422 (10)
Partnership's Share 115 (4) 13
Utilities      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 184 108 380
Cash used by investing activities (697) (1,109) 6,189
Cash from financing activities 285 1,548 (6,716)
Change during the year (228) 547 (147)
Other Ownership Interests (199) 471 (106)
Partnership's Share (29) 76 (41)
Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 1,189 692 776
Cash used by investing activities (1,039) (852) (1,018)
Cash from financing activities 826 11 369
Change during the year 976 (149) 127
Other Ownership Interests 843 (76) 77
Partnership's Share 133 (73) 50
Midstream      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 378 357 320
Cash used by investing activities (314) (267) (288)
Cash from financing activities (56) (95) (46)
Change during the year 8 (5) (14)
Other Ownership Interests 3 (3) (10)
Partnership's Share 5 (2) (4)
Data      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 852 531 323
Cash used by investing activities (735) (2,707) (305)
Cash from financing activities (77) 2,201 19
Change during the year 40 25 37
Other Ownership Interests 34 30 29
Partnership's Share 6 (5) 8
Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Cash from operating activities 0 0 7
Cash used by investing activities 0 0 (7)
Cash from financing activities 0 0 0
Change during the year 0 0 0
Other Ownership Interests 0 0 0
Partnership's Share $ 0 $ 0 $ 0