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Stock Compensation Plans - Stock Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |
Stock-based compensation plans expense | $ 128 | $ 116 | $ 125
Income tax benefit | (22) | (20) | (21)
Excess tax benefit on awards vested, exercised and expired | (6) | (1) | (6)
Total stock-based compensation plans expense, after-tax | $ 100 | $ 95 | $ 98

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