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Employee Benefit Plans - Stock Purchase Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock compensation expense $ 43 $ 39 $ 38
Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock compensation expense $ 24 $ 30 $ 28
Minimum | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP, annual contributions per employee, percent 3.00%    
Maximum | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP, annual contributions per employee, percent   15.00%