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Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 870	$ 909	$ 1,044
Increases:
Current year tax positions	167	81	4
Tax positions related to prior years	117	177	111
Decreases:
Tax positions related to prior years	(81)	(256)	(181)
Settlements with tax authorities	(76)	(15)	(67)
Lapse of statute of limitations	(22)	(26)	(1)
Effects of foreign currency translations	(1)	0	(1)
Balance, December 31	$ 974	$ 870	$ 909

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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Amount of unrecognized tax benefits.

+ 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=65882285&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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