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Share Capital - Common Shares (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]    
Stock options exercised (in shares) 951 115
Common shares purchased for cancellation (in shares) (2,800)  
Common shares    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding, beginning of year (in shares) 586,400 586,000
Stock options exercised (in shares) 1,000 400
Common shares purchased for cancellation (in shares) (2,800) 0
Number of shares outstanding, end of year (in shares) 584,600 586,400
Balance, beginning of year | $ $ 8,311 $ 8,305
Stock options exercised | $ 56 6
Common shares purchased for cancellation | $ (40) 0
Balance, end of year | $ $ 8,327 $ 8,311