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Financial Instruments - Additional information (Detail) $ / $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 CAD ($) $ / bbl | Dec. 31, 2023 CAD ($) $ / bbl | Dec. 31, 2023 CAD ($) $ / bbl | Dec. 31, 2023 CAD ($) $ / bbl $ / $ | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Total Debt | $ 7,108 | $ 7,108 | $ 7,108 | $ 7,108 | $ 8,691 |
Cash collateral for risk management contracts price change | $ 47 | $ 47 | $ 47 | $ 47 | 211 |
Discounted credit adjusted risk free rate | 5.60% | 5.60% | 5.60% | 5.60% |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Estimated fair value of contingent payment | $ 164 | $ 164 | $ 164 | $ 164 | 419 | $ 0
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) | $ / bbl | 71.86 | 71.86 | 71.86 | 71.86 |  |
Sensitivity price range | $ / bbl |  |  | 10.00 |  |  |
Increase | $ (21) |  |  |  | (68) |
Decrease | $ 45 |  |  |  | 157 |
WTI Option Implied Volatility |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Average implied volatility contingent payment percentage | 39.40% | 39.40% | 39.40% | 39.40% |  |
Sensitivity range |  | 10.00% |  |  |  |
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% | 5.80% | 5.80% | 5.80% |  |
Canadian to U.S. Dollar Foreign Exchange Rate Option Implied Volatility |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Sensitivity range |  | 5.00% |  | 0.00% |  |
Level 2 |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Debt, fair value | $ 6,600 | $ 6,600 | $ 6,600 | $ 6,600 | $ 7,800 |

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