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Share-Based Compensation - Full Value Share Award Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Full value share awards      
Summary of full value share award activity, Shares      
Non-vested at beginning (in shares) 1.3    
Granted (in shares) 0.6    
Deferred (in shares) 0.2    
Vested (in shares) (0.7)    
Forfeited (in shares) (0.1)    
Non-vested at ending (in shares) 1.3 1.3  
Summary of full value share award activity, Weighted Average Grant-date Fair Value      
Non-vested outstanding (in dollars per share) $ 170.91 $ 144.10  
Granted (in dollars per share) 217.47    
Deferred (in dollars per share) 251.99    
Vested (in dollars per share) 177.39    
Forfeited (in dollars per share) $ 165.98    
Full value share awards      
Fair value of equity instruments other than options vested in period (in dollars) $ 139 $ 124 $ 107
Restricted shares, restricted stock units and deferred share units      
Summary of full value share award activity, Weighted Average Grant-date Fair Value      
Granted (in dollars per share) $ 207.49 $ 163.54 $ 129.30
Compensation and commission deferrals      
Summary of full value share award activity, Weighted Average Grant-date Fair Value      
Granted (in dollars per share) $ 241.34 $ 147.96 $ 136.81