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RELATED PARTY TRANSACTIONS - Transactions With Significantly Influenced Investees (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues (Note 4) | $ 11,298 | $ 9,844 | $ 10,432 | $ 12,075 | $ 13,424 | $ 11,573 | $ 13,215 | $ 15,097 | $ 43,649 | $ 53,309 | $ 47,071
Operating and administrative |  |  |  |  |  |  |  |  | 8,600 | 8,219 | 6,712
Significantly Influenced Investees |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating and administrative |  |  |  |  |  |  |  |  | 625 | 503 | 380
Commodity costs |  |  |  |  |  |  |  |  | 63 | 778 | 790
Gas distribution costs |  |  |  |  |  |  |  |  | $ 140 | 136 | 131
Offshore - various joint ventures | Minimum | Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 22.00% |  |  |  |  |  |  |  | 22.00% |  |
Offshore - various joint ventures | Maximum | Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 74.30% |  |  |  |  |  |  |  | 74.30% |  |
Other | Minimum | Other | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 30.00% |  |  |  |  |  |  |  | 30.00% |  |
Other | Maximum | Other | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  | 50.00% |  |
Transportation and other services |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues (Note 4) |  |  |  |  |  |  |  |  | $ 19,829 | 18,506 | 16,172
Transportation and other services | Significantly Influenced Investees |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues (Note 4) |  |  |  |  |  |  |  |  | 169 | 185 | 237
Commodity sales |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues (Note 4) |  |  |  |  |  |  |  |  | 18,981 | 29,150 | 26,873
Commodity sales | Significantly Influenced Investees |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues (Note 4) |  |  |  |  |  |  |  |  | 0 | 51 | 20
Seaway Crude Pipeline System | Significantly Influenced Investees |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Operating and administrative |  |  |  |  |  |  |  |  | 632 | 495 | 389
Aux Sable Canada LP | Significantly Influenced Investees |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Commodity costs |  |  |  |  |  |  |  |  | $ 2 | $ 571 | $ 447

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