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Derivative Financial Instruments (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI on derivative $ 5us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax $ 1us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
Reclassification out of Accumulated Other Comprehensive Income | Foreign Exchange Contract    
Derivative Financial Instruments    
Amount of (gain) loss reclassified from OCI into revenue 4us-gaap_Revenues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
[1] (1)us-gaap_Revenues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
[1]
Amount of loss reclassified from Other Comprehensive Income into cost of revenue (a) 1us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
[1] 1us-gaap_CostOfGoodsSold
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
[1]
Cash Flow Hedging [Member] | Foreign Exchange Contract    
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI on derivative $ (5)us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_OtherComprehensiveIncomeMember
[1] $ (1)us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_OtherComprehensiveIncomeMember
[1]
[1] Effective portion