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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Beginning balance | $ 3,906 | $ 1,248
Liabilities Incurred | 22 | 30
Liabilities Acquired (Note 5) (1) | 48 | 2,856
Liabilities Settled | (215) | (144)
Liabilities Divested (Note 5) (1) | (89) | (140)
Change in Estimated Future Cash Flows | 693 | (472)
Change in Discount Rates | (980) | 450
Unwinding of Discount on Decommissioning Liabilities (Note 7) | 176 | 199
Transfers to Liabilities Related to Assets Held for Sale (Note 18) | 0 | (128)
Exchange Rate Movements and Other | (2) | 7
Ending balance | $ 3,559 | $ 3,906

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