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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Beginning balance | $ 1,248 | $ 1,235
Acquisitions (Note 5) | 2,856 | 0
Liabilities Incurred | 30 | 14
Liabilities Settled | (144) | (42)
Liabilities Disposed | (140) | (2)
Transfers to Liabilities Related to Assets Held for Sale (Note 16) | (128) | 0
Change in Estimated Future Cash Flows | (472) | 13
Change in Discount Rates | 450 | (28)
Unwinding of Discount on Decommissioning Liabilities (Note 7) | 199 | 57
Foreign Currency Translation | 7 | 1
Ending balance | $ 3,906 | $ 1,248

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