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Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Jan. 26, 2022
Aug. 31, 2020
Share repurchases        
Repurchase of common shares $ 579 $ 554    
Shares surrendered upon vesting for income tax obligation 0.3 0.3    
Income tax obligations paid on vesting date $ 89 $ 57    
Number of shares reacquired through net settlement options 0.2 0.6    
Aggregate value of shares reacquired through net settlement options $ 62 $ 134    
Treasury shares reissued for restricted stock award grants, performance share units and issuance of shares vested under advisor deferred compensation plans 0.5 0.3    
Share repurchase authorization        
Share repurchases        
Repurchase of common shares (in shares) 1.4 1.7    
Repurchase of common shares $ 429 $ 363    
Stock repurchase program, authorized amount     $ 3,000 $ 2,500
Remaining balance under stock repurchase program $ 3,000