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Fair Value Hedges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (loss) recognized in income on fair value of hedges	$ 13us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember	$ (2)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember
Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (loss) recognized in income on fair value of hedges	$ (13)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember	$ 2us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember

X

- 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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