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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 |
--- | --- | ---
Dec. 31, 2022 CAD ($) $ / $ | Dec. 31, 2021 CAD ($) $ / $ | Dec. 31, 2022 $ / $
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |
$0.05 Increase in the Canadian per U.S. Dollar Foreign Exchange Rate | $ 246 | $ 372 |
$0.05 Decrease in the Canadian per U.S. Dollar Foreign Exchange Rate | $ (246) | $ (372) |
U.S. to Canadian Dollar Exchange Rate |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |
Sensitivity Range | 0.05 | 0.05 | 0.05

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