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Investments - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 08, 2024 CAD ($) | Apr. 24, 2023 CAD ($) MW | May 06, 2022 USD ($) | Dec. 31, 2024 CAD ($) MW | Dec. 31, 2023 CAD ($) | Feb. 01, 2022 CAD ($)
Investment [Line Items] |  |  |  |  |  |
Contingent consideration payable |  |  |  | $ 81 | $ 0 |
Investments |  |  |  | $ 159 | 138 |
EMG |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 30.00% |  |
Skookumchuck |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 49.00% |  |
Capacity of facility (in megawatts) | MW |  |  |  | 136.8 |  |
PPA, period |  |  |  | 20 years |  |
Tent Mountain |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 60.00% | 50.00% |  |  |  |
Capacity of facility (in megawatts) | MW |  | 320 |  |  |  |
Total purchase consideration transferred |  | $ 8 |  |  |  |
Total purchase consideration transferred |  |  |  |  | $ 2 |
Contingent consideration payable | $ 17 |  |  |  |  |
Energy Impact Partners |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Committed investment |  |  | $ 25 |  |  |
Committed investment, period |  |  | 4 years |  |  |
Ekona | Class B Preferred Shares |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Investments |  |  |  |  |  | $ 2

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