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Stock Compensation Plans - Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options $ 5 $ 6 $ 11 $ 10
Stock-based compensation expense 37 20 81 45
Tax Benefit (4) (2) (9) (5)
Stock-based compensation expense (net of tax) 33 18 72 40
Restricted stock units 30 13 66 32
Employee stock purchase plan $ 2 $ 1 $ 4 $ 3