Change in Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Unrecognized tax benefits beginning balance	$ 852	$ 1,189	$ 1,164
Increases from positions taken during prior periods	34	143	94
Decreases from positions taken during prior periods	(74)	(247)	(132)
Increases from positions taken during the current period	84	147	131
Decreases relating to settlements with taxing authorities	(13)	(203)	(7)
Reductions resulting from the lapse of the applicable statute of limitations	(41)	(64)	(55)
Currency / other	(86)	(113)	(6)
Unrecognized tax benefits ending balance	$ 756	$ 852	$ 1,189

Unrecognized Tax Benefits Decrease Currency 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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Amount of increase 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 lapses of applicable statutes of limitations.

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