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Employee Benefit Plans - Restricted Stock Units (Details) - Restricted Stock Units (RSUs)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Restricted Stock Unit Activity      
Outstanding, beginning of period (in shares) 28    
Awarded and assumed (in shares) 16    
Vested (in shares) (12)    
Forfeited (in shares) (7)    
Outstanding, end of period (in shares) 25 28  
Expected to vest (in shares) 20    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted Average Grant Date Fair Value, Outstanding, beginning of period (in usd per share) | $ / shares $ 35.85 $ 36.82  
Weighted Average Grant Date Fair Value, Awarded and assumed (in usd per share) | $ / shares 33.26    
Weighted Average Grant Date Fair Value, Vested (in usd per share) | $ / shares $ 34.53    
Weighted Average Grant Date Fair Value, Forfeited (in usd per share) | $ / shares 35.98    
Weighted Average Grant Date Fair Value, Outstanding, end of period (in usd per share) | $ / shares $ 35.85 $ 36.82  
Additional Disclosures      
Aggregate intrinsic value of restricted stock vested | $ $ 552 $ 609 $ 684