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SEGMENT INFORMATION - Operating Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Disclosure of operating segments [line items]          
Revenues $ 5,429 $ 5,138 $ 10,821 $ 10,325  
Costs attributed to revenues (3,054) (2,993) (6,058) (5,970)  
General and administrative expenses (108) (92) (205) (189)  
Other (expense) income (109) (56) (182) (129)  
Interest expense (909) (826) (1,808) (1,620)  
Depreciation and amortization expense (941) (882) (1,901) (1,818)  
Deferred taxes 44 51 82 201  
Mark-to-market and other (88) (251) (82) 62  
Share of (losses) earnings from associates (12) 95 111 136 $ 439
Net income attributable to non-controlling interest (183) (176) (584) (820)  
Net income attributable to partnership 69 8 194 178  
Utilities          
Disclosure of operating segments [line items]          
Revenues 2,187 2,014 4,317 4,092  
Transport          
Disclosure of operating segments [line items]          
Revenues 1,150 1,251 2,324 2,512  
Midstream          
Disclosure of operating segments [line items]          
Revenues 984 1,100 2,033 2,215  
Data          
Disclosure of operating segments [line items]          
Revenues 1,108 773 2,147 1,506  
Operating segments          
Disclosure of operating segments [line items]          
Revenues 1,945 1,910 3,881 3,853  
Costs attributed to revenues (799) (812) (1,586) (1,652)  
General and administrative expenses (108) (92) (205) (189)  
Other (expense) income 14 12 29 15  
Interest expense (414) (410) (835) (804)  
Funds from operations 638 608 1,284 1,223  
Depreciation and amortization expense (421) (411) (846) (840)  
Deferred taxes 29 (2) 33 21  
Mark-to-market and other (177) (187) (277) (226)  
Share of (losses) earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest 0 0 0 0  
Net income attributable to partnership 69 8 194 178  
Operating segments | Utilities          
Disclosure of operating segments [line items]          
Revenues 676 658 1,360 1,317  
Costs attributed to revenues (358) (351) (718) (694)  
General and administrative expenses 0 0 0 0  
Other (expense) income (28) (30) (62) (67)  
Interest expense (103) (97) (201) (186)  
Funds from operations 187 180 379 370  
Operating segments | Transport          
Disclosure of operating segments [line items]          
Revenues 618 650 1,199 1,264  
Costs attributed to revenues (210) (225) (396) (438)  
General and administrative expenses 0 0 0 0  
Other (expense) income (11) (6) (17) (14)  
Interest expense (93) (100) (194) (191)  
Funds from operations 304 319 592 621  
Operating segments | Midstream          
Disclosure of operating segments [line items]          
Revenues 385 389 810 850  
Costs attributed to revenues (146) (162) (307) (367)  
General and administrative expenses 0 0 0 0  
Other (expense) income (4) (1) (12) (5)  
Interest expense (78) (83) (165) (165)  
Funds from operations 157 143 326 313  
Operating segments | Data          
Disclosure of operating segments [line items]          
Revenues 266 213 512 422  
Costs attributed to revenues (85) (74) (165) (153)  
General and administrative expenses 0 0 0 0  
Other (expense) income 6 1 12 7  
Interest expense (74) (62) (144) (130)  
Funds from operations 113 78 215 146  
Operating segments | Corporate          
Disclosure of operating segments [line items]          
Revenues 0 0 0 0  
Costs attributed to revenues 0 0 0 0  
General and administrative expenses (108) (92) (205) (189)  
Other (expense) income 51 48 108 94  
Interest expense (66) (68) (131) (132)  
Funds from operations (123) (112) (228) (227)  
Material reconciling items | Total for all associates          
Disclosure of operating segments [line items]          
Revenues (478) (511) (946) (985)  
Costs attributed to revenues 132 153 257 291  
General and administrative expenses 0 0 0 0  
Other (expense) income 7 14 17 33  
Interest expense 91 99 190 191  
Depreciation and amortization expense 114 118 234 224  
Deferred taxes (19) (12) (22) (4)  
Mark-to-market and other 177 44 171 114  
Share of (losses) earnings from associates (24) 95 99 136  
Net income attributable to non-controlling interest 0 0 0 0  
Net income attributable to partnership 0 0 0 0  
Material reconciling items | Non-controlling interests          
Disclosure of operating segments [line items]          
Revenues 3,962 3,739 7,886 7,457  
Costs attributed to revenues (2,387) (2,334) (4,729) (4,609)  
General and administrative expenses 0 0 0 0  
Other (expense) income (130) (82) (228) (177)  
Interest expense (586) (515) (1,163) (1,007)  
Depreciation and amortization expense (634) (589) (1,289) (1,202)  
Deferred taxes 34 65 71 184  
Mark-to-market and other (88) (108) 24 174  
Share of (losses) earnings from associates 12 0 12 0  
Net income attributable to non-controlling interest (183) (176) (584) (820)  
Net income attributable to partnership $ 0 $ 0 $ 0 $ 0