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Fair Value Hedges (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Interest Rate Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain / (loss) recognized in income on fair value of hedges | $ 1 | $ 4 | $ (2) | $ 9
Long-term Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain / (loss) recognized in income on fair value of hedges | $ (1) | $ (4) | $ 2 | $ (9)

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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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