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Stock Compensation Plans - Stock Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement [Abstract] |  |  |
Stock-based compensation plans expense | $ 125 | $ 130 | $ 116
Income tax benefit | (21) | (27) | (41)
Excess tax benefit on awards vested, exercised and expired | (6) | (5) | (15)
Total stock-based compensation plans expense, after-tax | $ 98 | $ 98 | $ 60

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