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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, 2022 CAD ($) $ / bbl $ / $ | Dec. 31, 2021 CAD ($) $ / bbl
WCS Forward Prices |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Sensitivity Price Range | $ / bbl | 10.00 | 5.00
Increase in volatility | $ (68) | $ (45)
Decrease in volatility | 157 | $ 45
WTI Option Implied Volatility |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Increase in volatility | (1) |
Decrease in volatility | $ 4 |
Sensitivity Range | 10.00% |
Canadian to U.S. Dollar Foreign Exchange Rate Option Implied Volatility |  |
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items] |  |
Increase in volatility | $ 0 |
Decrease in volatility | $ 0 |
Sensitivity Range | $ / $ | 5.00% |

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- Definition Contingent liabilities sensitivity range. + 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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