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Fair Value Hedges (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014
Interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain / (loss) recognized in income on fair value of hedges | $ 14 | $ 14
Long-term Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain / (loss) recognized in income on fair value of hedges | $ (14) | $ (14)

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

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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