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Other Long-Term Obligations (Parenthetical) (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Schedule of Other Liabilities [Line Items] |  |
Employee retirement benefit obligations in current liabilities | $ 56 | $ 56
Asset retirement obligations and other environmental liabilities in current liabilities | 102 | 102
Undiscounted Commitments | 0 | 5
Accounts Payable and Accrued Liabilities [Member] |  |
Schedule of Other Liabilities [Line Items] |  |
Lease liability due within one year, Operating leases | $ 95 | $ 102

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