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Fair Value Hedges (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain / (loss) recognized in income on fair value of hedges | $ (1) | $ 13
Long-term Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain / (loss) recognized in income on fair value of hedges | $ 1 | $ (13)

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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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