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Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 909	$ 1,044	$ 1,230
Increases:
Current year tax positions	81	4	124
Tax positions related to prior years	177	111	176
Decreases:
Tax positions related to prior years	(256)	(181)	(371)
Settlements with tax authorities	(15)	(67)	(94)
Lapse of statute of limitations	(26)	(1)	(21)
Effects of foreign currency translations	0	(1)	0
Balance, December 31	$ 870	$ 909	$ 1,044

X

- Definition

Decrease in unrecognized tax benefits excluding amounts pertaining to examined tax returns.

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Increase in unrecognized tax benefits excluding amounts pertaining to examined tax returns.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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 settlements with taxing authorities.

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

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