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Income Taxes - Reconciliation of Income Taxes Calculated at Statutory Rate (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Income Tax Expense Continuing Operations [Abstract]    
Earnings (Loss) Before Income Tax $ 4,071 $ 5,040
Canadian Statutory Rate (percent) 23.70% 23.70%
Expected Income Tax Expense (Recovery) $ 965 $ 1,194
Effect on Taxes Resulting From:    
Statutory and Other Rate Differences (34) (38)
Non-Taxable Capital (Gains) Losses 45 (15)
Non-Recognition of Capital (Gains) Losses 45 (30)
Adjustments Arising From Prior Year Tax Filings (31) (16)
Recognition of U.S. Tax Basis (77) (115)
Other 16 (49)
Total Tax Expense (Recovery) $ 929 $ 931
Effective Tax Rate (percent) 22.80% 18.50%