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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, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Beginning uncertain tax positions | $ 540 | $ 287
Increases related to current year income tax positions | 22 | 123
Increases related to prior year income tax positions | 25 | 131
Settlements and resolutions of income tax audits | (37) | (9)
Statute of limitations expirations | (14) | (4)
Foreign currency translation |  | (12)
Foreign currency translation | (8) |
Ending uncertain tax positions | $ 528 | $ 540

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