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Share Capital - Common Shares (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Reconciliation of Number of Shares Outstanding [Roll Forward]    
Stock options exercised (in shares) 708 951
Common shares purchased for cancellation (in shares) (11,500) (2,800)
Common shares    
Reconciliation of Number of Shares Outstanding [Roll Forward]    
Number of shares outstanding, beginning of year (in shares) 584,600 586,400
Stock options exercised (in shares) 800 1,000
Common shares purchased for cancellation (in shares) (11,500) (2,800)
Number of shares outstanding, end of year (in shares) 573,900 584,600
Balance, beginning of year | $ $ 8,327 $ 8,311
Stock options exercised | $ 47 56
Common shares purchased for cancellation | $ (182) (40)
Balance, end of year | $ $ 8,192 $ 8,327