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Risk Management Activities - Impacts of currency rate risk (Details) - Currency risk - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of credit risk exposure [line items] |  |  |
Net earnings increase (decrease) | $ (14) | $ (14) | $ (12)
OCI gain | 0 | 0 | 1
USD |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Net earnings increase (decrease) | (11) | (12) | (13)
OCI gain | 0 | 0 | 1
AUD |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Net earnings increase (decrease) | (3) | (2) | 1
OCI gain | $ 0 | $ 0 | $ 0

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