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Financial Instruments - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) MW | Dec. 31, 2022 CAD ($) MW | Apr. 05, 2022 MW | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities | $ 3,466 | $ 3,653 |  |
Long-term wind energy sale – Eastern US |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Membership interest | 100.00% |  |  |
Capacity of facility (in megawatts) | MW | 90 |  |  |
Long-term wind energy sale – Canada |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Membership interest | 100.00% |  |  |
Garden Plain Wind Project |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Capacity of facility (in megawatts) | MW | 130 |  |  |
Weighted average extension period (in years) | 17 years |  |  |
Long-term wind energy sale - Central US |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Membership interest | 100.00% |  |  |
White Rock East And White Rock West Wind Power Projects |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Capacity of facility (in megawatts) | MW |  | 300 |  |
Horizon Hill Wind Project |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Membership interest |  |  | 10000.00% |
Capacity of facility (in megawatts) | MW |  |  | 200 |
Maximum | Fixed-price contracts |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Capacity long-term fixed price power sale | MW | 380 |  |  |
Minimum | Fixed-price contracts |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Capacity long-term fixed price power sale | MW | 300 |  |  |
Level I | Recurring fair value measurement |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Commodity risk management assets and liabilities | $ (13) | $ 23 |  |
Level II | Recurring fair value measurement |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Commodity risk management assets and liabilities | (244) | 173 |  |
Level III | Recurring fair value measurement |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Commodity risk management assets and liabilities | (147) | (782) |  | $ 159
Level III | Recurring fair value measurement | Other |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Commodity risk management assets and liabilities | 19 | 6 |  |
Level III | Recurring fair value measurement | Financial liabilities at fair value through profit or loss, category |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities | 203 | 813 |  |
Level III | Recurring fair value measurement | Other financial assets (FVTPL) |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial assets | $ 56 | $ 31 |  |

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