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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company'S Open Risk Management Positions (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Commodity Price Risk [Member] | Crude Oil Contracts [Member] |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Description of exposure to risk | Crude Oil Commodity Price | Crude Oil Commodity Price
Sensitivity Range | ± US$5.00 per bbl Applied to WTI and Condensate Hedges | ± US$5.00 per bbl Applied to WTI and Condensate Hedges
Increase | $ (44) | $ 3
Decrease | $ 44 | $ (3)
Commodity Price Risk [Member] | Crude oil differential contracts [Member] |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Description of exposure to risk | Crude Oil Differential Price | Crude Oil Differential Price
Sensitivity Range | ± US$2.50 per bbl Applied to Differential Hedges Tied to Production | ± US$2.50 per bbl Applied to Differential Hedges Tied to Production
Increase | $ (2) | $ 5
Decrease | 2 | (5)
Currency risk [Member] |  |
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 | 300 | 250
$0.05 Decrease in the Canadian per U.S. Dollar Foreign Exchange Rate | $ (300) | $ (250)

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