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Employee Incentive Plans - Narrative (Details)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
employee
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Related compensation expense to be recognized $ 66      
Period over which compensation expense will be recognized 2 years      
Restricted Stock Grants and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Related compensation expense to be recognized $ 152      
Period over which compensation expense will be recognized 2 years      
Number of employees holding share-based payment awards | employee 10,300      
Awards outstanding (in shares) | shares 1,600 1,945 2,138 1,295
SPSs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Related compensation expense to be recognized $ 63      
Period over which compensation expense will be recognized 2 years      
Number of employees holding share-based payment awards | employee 1,500      
Awards outstanding (in shares) | shares 808 818 707 778
Perfromance period 3 years      
Minimum | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Minimum | Restricted Stock Grants and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Minimum | SPSs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of original shares granted that may be awarded at end of performance period 0.00%      
Maximum | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Award expiration period 10 years      
Remaining maturity of traded options 1 year      
Maximum | Restricted Stock Grants and Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Maximum | SPSs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of original shares granted that may be awarded at end of performance period 200.00%