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Financial Instruments - Narrative (Detail) $ in Millions | Sep. 30, 2023 CAD ($) $ / bbl | Dec. 31, 2022 CAD ($)
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Disclosure of detailed information about financial instruments [Line Items] |  |
Borrowings | $ 7,224 | $ 8,691
Discounted credit adjusted risk free rate | 5.40% |
Sunrise Oil Sands Partnership |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Estimated fair value of contingent payment | $ 295 | 419
Western Canadian Select Forward Pricing |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Average forward price for Western Canadian Select Crude Oil for the remaining term (in CAD per barrel) | $ / bbl | 89.81 |
West Texas Intermediate Option Volatility |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Average implied volatility contingent payment percentage | 36.60% |
Foreign Exchange Average Volatility Rate Contingent |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Average implied volatility contingent payment percentage | 5.90% |
Level 2 of fair value hierarchy |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Debt, fair value | $ 6,200 | $ 7,800

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