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Income Taxes (Schedule of Unresolved Income Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	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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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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