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Business Acquisitions - Heartland Generation (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 04, 2024 CAD ($) MW
Heartland Generation |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total purchase consideration transferred |  |  | $ 574
Working capital adjustments |  |  | 2
Cash and cash equivalents |  |  | 276
Cash consideration |  |  | 493
Contingent consideration payable |  |  | 81
Goodwill arising on acquisition (Note 22) |  |  | $ 51
Transaction costs |  | $ 24 |
Revenue of acquiree since acquisition date | $ 34 |  |
Net loss of acquiree since acquisition date | $ (11) |  |
Revenue of combined entity as if combination occurred at beginning of period |  | 598 |
Profit (loss) of combined entity as if combination occurred at beginning of period |  | $ 66 |
Heartland Generation | Cogeneration |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  |  | 507
Heartland Generation | Contracted And Merchant Peaking Generation |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  |  | 387
Heartland Generation | Natural Gas-Fired Thermal Generation |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  |  | 950
Heartland Generation | Battle River Carbon Hub |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  |  | 400
Heartland Generation | Poplar Hill and Rainbow Lake Assets |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  |  | 97
Heartland Generation, Post Adjustments |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total purchase consideration transferred |  |  | $ 542
Consideration reduction, amount |  |  | $ (95)

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