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Income Taxes (Schedule of Unresolved Income Tax Positions) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Beginning uncertain tax positions | $ 472 | $ 528
Increases related to current year income tax positions | 12 | 62
Increases related to prior year income tax positions | 5 | 5
Settlements and resolutions of income tax audits | (41) | (78)
Statute of limitations expirations and other | (7) | (40)
Foreign currency translation | 16 |
Foreign currency translation |  | (5)
Ending uncertain tax positions | $ 457 | $ 472

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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