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Change in Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Unrecognized tax benefits beginning balance	$ 610	$ 756	$ 852
Increases from positions taken during prior periods	33	18	34
Decreases from positions taken during prior periods	(93)	(123)	(74)
Increases from positions taken during the current period	64	90	84
Decreases relating to settlements with taxing authorities	(54)	(75)	(13)
Reductions resulting from the lapse of the applicable statute of limitations	(29)	(43)	(41)
Currency/other	48	(13)	(86)
Unrecognized tax benefits ending balance	$ 579	$ 610	$ 756

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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=84230637&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period 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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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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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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Paragraph 15A
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