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Stock Compensation Plans - Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units $ 26 $ 36
Stock options 5 6
Employee stock purchase plan 3 2
Stock-based compensation expense 34 44
Tax Benefit (4) (5)
Stock-based compensation expense (net of tax) $ 30 $ 39