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Finance Costs - Schedule of Finance Costs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finance Costs [Abstract]      
Interest Expense – Short-Term Borrowings and Long-Term Debt $ 478 $ 557 $ 392
Net Premium (Discount) on Redemption of Long-Term Debt (29) 121 (25)
Interest Expense – Lease Liabilities (Note 27) 163 171 87
Unwinding of Discount on Decommissioning Liabilities (Note 29) 176 199 57
Other 37 34 25
Total finance costs excluding capitalized interest 825 1,082 536
Capitalized Interest (5) 0 0
Finance Costs $ 820 $ 1,082 [1] $ 536 [1]
[1] See Note 3X for revisions to prior period results.