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Financial Instruments - Summary of Changes in Inputs to Option Pricing Model, Resulted in Unrealized Gains (Losses) Impacting Earnings Before Income Tax (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
WCS Forward Prices [Member] |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Sensitivity Price Range | 5.00 | 5.00
Increase in volatility | $ (41) | $ (129)
Decrease in volatility | $ 32 | $ 80
WTI Option Volatility [Member] |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Sensitivity Range | 5.00% | 5.00%
Increase in volatility | $ (18) | $ (45)
Decrease in volatility | $ 17 | $ 42
Foreign Exchange Rate Option Volatility [Member] |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Sensitivity Range | 5.00% | 5.00%
Increase in volatility | $ 7 | $ 10
Decrease in volatility | $ (10) | $ (19)

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- Definition Contingent liabilities sensitivity price range. + References No definition available. + Details
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- Definition Contingent liabilities sensitivity range. + References No definition available. + Details
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- Definition Disclosure of sensitivity of fair value measurement to changes in unobservable inputs liabilities. + References No definition available. + Details
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- Definition Theoretical impact to net earnings before tax from decrease in option pricing model sensitivity inputs. + References No definition available. + Details
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- Definition Theoretical impact to net earnings before tax from increase in option pricing model sensitivity inputs. + References No definition available. + Details
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- Details
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- Details
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- Details
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