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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member]) In Millions, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 BRL	Dec. 31, 2014 CAD	Dec. 31, 2014 DKK	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 GBP (£)	Dec. 31, 2014 MXN	Dec. 31, 2014 NOK	Dec. 31, 2014 SEK	Dec. 31, 2014 SGD	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CAD	Dec. 31, 2013 DKK	Dec. 31, 2013 EUR (€)	Dec. 31, 2013 GBP (£)	Dec. 31, 2013 NOK	Dec. 31, 2013 RUB	Dec. 31, 2013 SEK	Dec. 31, 2013 SGD
Derivative [Line Items]
Foreign currency, Cash flow hedging	$ 231us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember		14us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	227us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	€ 462us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	£ 80us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember		10,781us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember		44us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	$ 357us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	16us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	278us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	€ 406us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	£ 23us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	10,503us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember			17us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Foreign currency, Non-designated hedging	$ 1,092us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	57us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	322us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	€ 401us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	£ 19us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	118us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	4,052us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	3us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	$ 715us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	3us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	177us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	€ 310us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	£ 14us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	3,257us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	2,149us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	3us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow 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 4B

-Subparagraph (a),(b),(c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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X

- Definition

Net fair value of all derivative instruments not designated as a hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611

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