Change in Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized tax benefits beginning balance	$ 756	$ 852	$ 1,189
Increases from positions taken during prior periods	18	34	143
Decreases from positions taken during prior periods	(123)	(74)	(247)
Increases from positions taken during the current period	90	84	147
Decreases relating to settlements with taxing authorities	(75)	(13)	(203)
Reductions resulting from the lapse of the applicable statute of limitations	(43)	(41)	(64)
Currency / other	(13)	(86)	(113)
Unrecognized tax benefits ending balance	$ 610	$ 756	$ 852

Unrecognized Tax Benefits Decrease Currency Other

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

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