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Finance Costs - Schedule of Finance Costs (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Finance Costs [Abstract]        
Interest Expense – Short-Term Borrowings and Long-Term Debt $ 94 $ 121 $ 285 $ 381
Net Premium (Discount) on Redemption of Long-Term Debt (84) (4) (84) (29)
Interest Expense - Lease Liabilities 41 40 121 123
Unwinding of Discount on Decommissioning Liabilities 55 43 165 132
Other 5 9 18 27
Total finance costs 111 209 505 634
Capitalized Interest (5) (2) (12) (3)
Finance Costs $ 106 $ 207 $ 493 $ 631