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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company's Open Risk Management Positions (Detail) - Currency risk $ in Millions | 12 Months Ended
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Dec. 31, 2024 CAD ($) $ / $ | Dec. 31, 2023 CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Increase | $ 196 | $ 197
Decrease | $ (196) | $ (197)
Canadian to U.S. Dollar Exchange Rate |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / $ | 0.05 |

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