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Decommissioning Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Aug. 31, 2022 | Dec. 31, 2021
Disclosure of other provisions [line items] |  |  |
Estimated future cash flows required to settle the obligation | $ 14,000 |  | $ 14,000
Credit-adjusted risk-free rate | 6.10% |  | 4.40%
Inflation rate | 2.00% |  | 2.00%
Restricted Cash | $ 209 |  | $ 186
Sunrise Oil Sands Partnership |  |  |
Disclosure of other provisions [line items] |  |  |
Carrying value of pre-existing decommissioning liabilities |  | $ 11 |
Bottom of range |  |  |
Disclosure of other provisions [line items] |  |  |
Expected settlement of decommissioning liabilities | 250 |  |
Top of range |  |  |
Disclosure of other provisions [line items] |  |  |
Expected settlement of decommissioning liabilities | $ 300 |  |

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