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Shareholders' Equity Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended
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Dec. 15, 2020 | Sep. 22, 2020 | Jun. 30, 2020 | Mar. 24, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |
Cash dividends per common share | $ 1.25 | $ 1.25 | $ 1.25 | $ 1.08 | $ 4.83 | $ 4.14 | $ 3.45
Payments of Ordinary Dividends, Common Stock | $ 1,184 | $ 1,188 | $ 1,188 | $ 1,024 | $ 4,584 | $ 3,932 | $ 3,320

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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