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Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 24, 2023
Share repurchases        
Repurchase of common shares $ 2,566 $ 2,212 $ 2,095  
Stock repurchase program, authorized amount       $ 3,500
Remaining balance under stock repurchase program $ 888      
Shares surrendered upon vesting for income tax obligation (in shares) 0.3 0.3 0.3  
Income tax obligations paid on vesting date $ 115 $ 99 $ 99  
Shares reacquired through net settlement of options (in shares) 0.5 0.4 0.5  
Aggregate value of shares reacquired through net settlement of options $ 220 $ 150 $ 145  
Treasury shares reissued for restricted stock award grants, performance share units and issuance of shares vested under advisor deferred compensation plans (in shares) 0.8 0.6 0.8  
Share repurchase authorization        
Share repurchases        
Repurchase of common shares (in shares) 4.9 5.9 6.6  
Repurchase of common shares $ 2,200 $ 2,000 $ 1,900