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Finance Costs - Schedule of Finance Costs (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Finance Costs [Abstract]        
Interest Expense – Short-Term Borrowings and Long-Term Debt $ 130 $ 136 $ 260 $ 278
Net premium (discount) on redemption of long-term debt   0 (25) 0
Interest Expense - Lease Liabilities 41 42 83 86
Unwinding of Discount on Decommissioning Liabilities 45 46 89 94
Other 12 8 18 18
Finance Costs, Including Capitalized Interest 196 232 425 476
Capitalized Interest (1) 0 (1) 0
Total Finance Costs $ 195 $ 232 [1] $ 424 $ 476 [1]
[1] See Note 3 for revisions to prior period results.