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Stock Compensation Plans - Stock Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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