Stockholders' Equity - Summary of Changes in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Equity [Abstract]
Foreign currency translation adjustments	$ 41

Current period adjustment resulting from gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, that is, settlement is not planned or anticipated in the foreseeable future. Resulting from the entities to the transaction being consolidated, combined, or accounted for by the equity method in the reporting entity's financial statements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32157-110900

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 35

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration