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Financial Instruments - Additional information (Detail) $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) share | Dec. 31, 2022 CAD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Total Debt | $ 7,500 | $ 7,100 |
Cash collateral for risk management contracts price change | 18 | $ 47 |
Discounted credit adjusted risk free rate |  | 5.60% |
WCS Forward Prices |  |  |
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) | share |  | 71.86 |
WTI Option Implied Volatility |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Average implied volatility contingent payment percentage |  | 39.40% |
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Average implied volatility contingent payment percentage |  | 5.80% |
Sunrise Oil Sands Partnership |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent liabilities recognised in business combination | 0 | $ 164 | $ 419
Level 2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Fair value debt carried at amortized cost | $ 6,900 | $ 6,600 |

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