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Finance Costs - Schedule of Finance Costs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finance Costs [Abstract]      
Interest Expense – Short-Term Borrowings and Long-Term Debt $ 557 $ 392 $ 407
Net Premium (Discount) on Redemption of Long-Term Debt 121 (25) (63)
Interest Expense - Lease Liabilities 171 87 82
Unwinding of Discount on Decommissioning Liabilities 199 57 58
Other 34 25 27
Total Finance Costs $ 1,082 $ 536 [1] $ 511 [1]
[1] See Note 3(w) for revisions to comparative results.