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Income Taxes (Schedule of Unresolved Income Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	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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