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Employee Benefit Plans - Share-based Compensation Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock authorized under share based payment award plans (in shares) 45    
Common stock shares available for awards (in shares) 28    
Proceeds from stock options exercised $ 3 $ 10 $ 25
Tax benefit associated with share based compensation payments 7 5 4
Unrecognized compensation cost $ 60    
Unrecognized compensation cost, period for recognition 2 years 3 months 18 days    
Aggregate intrinsic value of stock options and stock appreciation rights exercisable $ 107    
Aggregate intrinsic value of performance shares and restricted stock $ 111    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Vesting period 3 years    
Tax benefit associated with share based compensation payments $ 2 $ 6 5
Stock Appreciation Rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Vesting period 3 years    
Weighted average grant date fair value of stock appreciation rights granted during period (in usd per share) $ 53.25    
Weighted average grant date fair value (in usd per share) $ 60.63 $ 0  
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Tax benefit realized form vesting of performance shares and other restricted awards $ 1 $ 4 $ 1
Weighted average grant date fair value of stock appreciation rights granted during period (in usd per share) $ 65.45    
Weighted average grant date fair value (in usd per share) $ 0 $ 0  
Performance Share Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Stock Options and Stock Appreciation Rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of options granted during period (in usd per share) $ 10.38 20.92 $ 20.18
Weighted average grant date fair value of stock appreciation rights granted during period (in usd per share) $ 10.38 $ 20.92 $ 20.18
Aggregate intrinsic value of stock options and stock appreciation rights exercisable $ 13 $ 53 $ 36
Performance Share Units and Other Restricted Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value (in usd per share) $ 54.29 $ 109.17 $ 131.47
Aggregate intrinsic value of performance shares and restricted stock $ 10 $ 33 $ 11