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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, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Beginning uncertain tax positions | $ 287 | $ 313
Increases related to current year income tax positions | 123 | 47
Increases related to prior year income tax positions | 131 | 22
Settlements and resolutions of income tax audits | (9) | (82)
Statute of limitations expirations | (4) | (9)
Foreign currency translation |  | (4)
Foreign currency translation | 12 |
Ending uncertain tax positions | 540 | 287
Ending uncertain tax positions | $ 287 | $ 313

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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