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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2021 CAD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract] |
Beginning balance | $ 1,248
Acquisitions (Note 4) | 2,719
Liabilities Incurred | 12
Liabilities Acquired | 5
Liabilities Settled | (97)
Liabilities Disposed | (128)
Change in Estimated Future Cash Flows | 8
Unwinding of Discount on Decommissioning Liabilities (Note 6) | 143
Foreign Currency Translation | 4
Ending balance | $ 3,914

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