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Credit Facilities, Long-Term Debt and Lease Liabilities - Currency Impacts (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about borrowings [line items] |  |  |
Net increase (decrease) in borrowings under credit facilities | $ 46 | $ (449) | $ 114
USD | Senior Notes and Tax Equity |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | 27 | 41 |
AUD | Non-Recourse Senior Secured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Net increase (decrease) in borrowings under credit facilities | $ (9) | $ (9) |

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