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Stock Compensation Plans - Stock Compensation Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Stock-based compensation plans expense $ 116 $ 125 $ 130
Income tax benefit (20) (21) (27)
Excess tax benefit on awards vested, exercised and expired (1) (6) (5)
Total stock-based compensation plans expense, after-tax $ 95 $ 98 $ 98