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Share-Based Payments - Restricted Stock Units and Restricted Stock Awards Activities (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk free interest rate 0.11%    
Volatility 37.39%    
Dividend yield 0.47%    
Restricted Stock      
Restricted stock rights activity      
Restricted stock rights at the beginning of the period (in shares) 7,181    
Restricted stock rights, granted (in shares) 2,254    
Restricted stock rights, vested (in shares) (1,513)    
Restricted stock rights, forfeited (in shares) (820)    
Restricted stock rights at the ending of the period (in shares) 7,102 7,181  
Restricted stock rights, weighted-average grant date fair value information      
Restricted stock rights, weighted-average grant date fair value at the beginning of the period (in dollars per share) $ 54.23    
Restricted stock rights, weighted-average grant date fair value, granted (in dollars per share) 201.25    
Restricted stock rights, weighted-average grant date fair value, vested (in dollars per share) 49.76    
Restricted stock rights, weighted-average grant date fair value, forfeited (in dollars per share) 55.39    
Restricted stock rights, weighted-average grant date fair value (in dollars per share) ending balance $ 82.50 $ 54.23  
Share-based compensation, unrecognized compensation $ 170    
Share-based compensation, unrecognized compensation weighted-average period of recognition 9 months    
Total fair value of shares vested $ 82 $ 147 $ 120
Performance shares      
Restricted stock rights, weighted-average grant date fair value information      
Performance-vesting restricted stock rights for which the accounting grant date has not been set (shares) 2,400    
Performance-vesting restricted stock rights granted without an accounting grant date (shares) 1,400    
Share-based compensation, unrecognized compensation $ 154    
Share-based compensation, unrecognized compensation weighted-average period of recognition 9 months    
Employee Stock Option And Restricted Stock      
Restricted stock rights, weighted-average grant date fair value information      
Income tax benefit from stock option exercises and restricted stock rights $ 61 $ 47 $ 94