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Share-Based Compensation - Performance-Based and Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Additional Company Information [Abstract]      
Vesting period 3 years    
Minimum      
Additional Company Information [Abstract]      
Vesting period 1 year    
PX Performance Based Awards      
Additional Company Information [Abstract]      
Vesting period 3 years    
Awards to be settled in cash (in shares) 10,000    
Unrecognized compensation expense $ 42    
Number of Shares (000’s)      
Non-vested at beginning of period (in shares) 246,000    
Granted (in shares) 224,000    
Vested (in shares) 0    
Cancelled and forfeited (in shares) (33,000)    
Non-vested at end of period (in shares) 437,000 246,000  
Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 184.29    
Granted (in dollars per share) 174.70    
Vested (in dollars per share) 0    
Cancelled and forfeited (in dollars per share) 178.27    
Non-vested at end of period (in dollars per share) $ 179.76 $ 184.29  
Restricted Stock      
Additional Company Information [Abstract]      
Awards to be settled in cash (in shares) 12,000    
Unrecognized compensation expense $ 21    
Number of Shares (000’s)      
Non-vested at beginning of period (in shares) 884,000    
Granted (in shares) 185,973    
Vested (in shares) (355,000)    
Cancelled and forfeited (in shares) (27,000)    
Non-vested at end of period (in shares) 688,000 884,000  
Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 129.43    
Granted (in dollars per share) 174.95 $ 165.04 $ 144.86
Vested (in dollars per share) 117.62    
Cancelled and forfeited (in dollars per share) 160.90    
Non-vested at end of period (in dollars per share) 148.56 129.43  
Performance Shares TSR      
Average Grant Date Fair Value      
Granted (in dollars per share) 198.61 215.85 $ 0
Performance Shares ROC      
Average Grant Date Fair Value      
Granted (in dollars per share) $ 161.56 $ 168.47