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Fair Value of Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Marketable Securities    
Marketable Securities, Noncurrent $ 336us-gaap_MarketableSecuritiesNoncurrent $ 310us-gaap_MarketableSecuritiesNoncurrent
Derivative Instruments and Hedging Activities    
Derivatives, notional amount 146invest_DerivativeNotionalAmount 161invest_DerivativeNotionalAmount
Cash Flow Hedges    
Derivative Instruments and Hedging Activities    
Derivatives, notional amount $ 34invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 $ 77invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember