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Schedule of Derivative Instruments not Designated as Hedges Losses (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2015
Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/(loss) recognized in Nonoperating income (expense): Miscellaneous, net | $ 41 | $ (2)

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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of price risk derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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