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Employee Incentive Plans - Restricted Stock (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Employees
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Employee Incentive Plan Aggregate Disclosures [Line Items]      
Compensation cost | $ $ 299 $ 180 $ 178
Restricted Stock Grants And Units [Member]      
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Roll Forward      
Outstanding - January 1 | shares 2,138 1,295 1,309
Awarded | shares 870 1,451 451
Vested | shares (964) (560) (409)
Forfeited | shares (99) (48) (56)
Outstanding - December 31 | shares 1,945 2,138 1,295
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward [Abstract]      
Outstanding - January 1 | $ / shares $ 168.12 $ 126.44 $ 97.78
Awarded | $ / shares 183.86 183.29 155.21
Vested | $ / shares 160.74 112.53 67.09
Forfeited | $ / shares 168.68 150.84 121.74
Outstanding - December 31 | $ / shares $ 178.78 $ 168.12 $ 126.44
Fair value of shares vested | $ $ 171 $ 107 $ 62
Number of employees holding share-based payment awards | Employees 10,300    
Related compensation expense to be recognized | $ $ 160    
Period over which compensation expense will be recognized 2 years    
Restricted Stock Grants And Units [Member] | Minimum [Member]      
Employee Incentive Plan Aggregate Disclosures [Line Items]      
Award vesting period 1 year    
Restricted Stock Grants And Units [Member] | Maximum [Member]      
Employee Incentive Plan Aggregate Disclosures [Line Items]      
Award vesting period 3 years