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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Income Statement Impact of Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues $ 11,537 $ 8,885 $ 6,597
Net income 2,719 904 650
OCI 260 (62) 590
Comprehensive income 2,979 842 1,240
Total      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 16,437 8,897 6,595
Net income 2,235 1,049 651
OCI (278) (1,495) 237
Comprehensive income 1,957 (446) 888
Net income (loss) attributable to the Partnership 88 131 224
Utilities      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 1,336 1,715 1,046
Net income 521 364 354
OCI 28 (205) 26
Comprehensive income 549 159 380
Net income (loss) attributable to the Partnership 84 50 57
Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 11,808 4,161 3,351
Net income 1,574 171 22
OCI (435) (1,419) 364
Comprehensive income 1,139 (1,248) 386
Net income (loss) attributable to the Partnership 15 (101) 2
Midstream      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 833 767 734
Net income 146 236 351
OCI (46) 0 (54)
Comprehensive income 100 236 297
Net income (loss) attributable to the Partnership 74 136 184
Data      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 2,460 2,245 1,447
Net income 70 293 (38)
OCI 73 374 57
Comprehensive income 143 667 19
Net income (loss) attributable to the Partnership 14 45 (9)
Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Revenues 0 9 17
Net income (76) (15) (38)
OCI 102 (245) (156)
Comprehensive income 26 (260) (194)
Net income (loss) attributable to the Partnership $ (99) $ 1 $ (10)