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Commitments and Contingencies - Narrative (Details) TJ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 09, 2024 CAD ($) | Dec. 31, 2024 CAD ($) TJ | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of Commitments [Line Items] |  |  |  |
Total firm natural gas transportation | TJ |  | 450 |  |
Total firm natural gas transportation on average | TJ |  | 160 |  |
Revenue |  | $ 2,845 | $ 3,355 | $ 2,976
Operations, maintenance, and administration (Note 5) |  | 655 |  | 521
Fines and penalties |  |  |  | 33
Operating segments |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Revenue |  | 2,875 | 3,326 | 3,495
Operations, maintenance, and administration (Note 5) |  | 590 |  | 521
Operating segments | Hydro |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Revenue |  | 390 | $ 529 | 627
Operations, maintenance, and administration (Note 5) |  | 55 |  | 53
Brazeau penalties | Operating segments |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Revenue |  | (20) |  | 20
Operations, maintenance, and administration (Note 5) |  | (31) |  | (2)
Brazeau penalties | Operating segments | Hydro |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Revenue |  | (20) |  | 20
Operations, maintenance, and administration (Note 5) |  | (31) |  | $ (2)
Garden Plain |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Damages sought |  | $ 53 |  |
Sundance A Decommissioning |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Proceeds from settlement | $ 9 |  |  |
Sundance And Keephills |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Total firm natural gas transportation | TJ |  | 400 |  |
Sheerness |  |  |  |
Disclosure of Commitments [Line Items] |  |  |  |
Total firm natural gas transportation | TJ |  | 150 |  |

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