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Stock Compensation - Effects on Cash Flows (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] |  |  |  |
Proceeds from common stock transactions | [1] | $ 470 | $ 539 | $ 373
Tax benefit realized from stock compensation |  | 195 | 224 | 179
Reduction to deferred tax asset |  | (44) | (49) | (43)
Excess tax benefit for stock compensation |  | 151 | 175 | 136
Taxes paid for employee shares withheld |  | $ 53 | $ 52 | $ 60
[1] | Net of taxes paid for employee shares withheld of $53 million, $52 million and $60 million in 2020, 2019 and 2018, respectively.

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=120383193&loc=d3e11374-113907 + Details
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