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Income Taxes (Reconciliation of Unrecognized Tax Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Beginning balance	$ 228	$ 68	$ 95
Increases related to current year tax positions	18	13	3
Increases related to prior year tax positions	35	168	15
Decreases related to prior year tax positions	(3)	(13)	(36)
Settlements	(2)	(1)	0
Lapse of statute of limitations	(16)	(5)	(2)
Other, primarily due to exchange rate fluctuations affecting non-U.S. tax positions	(3)	(2)	(7)
Unrecognized Tax Benefits, Ending balance	$ 257	$ 228	$ 68

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Unrecognized Tax Benefits, Other

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ 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=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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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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