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Share-Based Plans - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee stock purchase plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense (less than in all years for ESPP) $ 1,000,000 $ 1,000,000 $ 1,000,000
Restricted stock units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Stock compensation expense (less than in all years for ESPP) $ 15,000,000 22,000,000 25,000,000
Compensation expense not yet recognized $ 7,000,000    
Compensation expense not yet recognized, period for recognition 1 year    
Restricted stock units (RSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Restricted stock units (RSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
ShareMatch | Employee stock purchase plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum monthly purchase per employee $ 342 $ 327 $ 302
Employee investment shares (in shares) 3    
Award vesting period 3 years