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Stock Compensation - Effects on Cash Flows (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] |  |  |  |
Proceeds from common stock transactions | [1] | $ 377 | $ 470 | $ 539
Tax benefit realized from stock compensation |  | 175 | 195 | 224
Reduction to deferred tax asset |  | (39) | (44) | (49)
Excess tax benefit for stock compensation |  | 136 | 151 | 175
Taxes paid for employee shares withheld |  | $ 53 | $ 53 | $ 52
[1] | Net of taxes paid for employee shares withheld of $53 million, $53 million and $52 million in 2021, 2020 and 2019, respectively.

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