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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Derivatives, Fair Value [Line Items] |  |
Derivative asset at fair value, current | $ 97us-gaap_DerivativeAssetsCurrent | $ 64us-gaap_DerivativeAssetsCurrent
Derivative asset at fair value, noncurrent | 6us-gaap_DerivativeAssetsNoncurrent | 1us-gaap_DerivativeAssetsNoncurrent
Total derivatives, hedge assets at fair value | 103us-gaap_DerivativeAssets | 65us-gaap_DerivativeAssets
Derivative liability at fair value, current | 106us-gaap_DerivativeLiabilitiesCurrent | 59us-gaap_DerivativeLiabilitiesCurrent
Derivative liability at fair value, noncurrent | 11us-gaap_DerivativeLiabilitiesNoncurrent | 7us-gaap_DerivativeLiabilitiesNoncurrent
Total derivatives, hedge liabilities at fair value | 117us-gaap_DerivativeLiabilities | 66us-gaap_DerivativeLiabilities
Derivatives accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange forward/options, hedge assets at fair value | 58us-gaap_ForeignCurrencyFairValueHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 27us-gaap_ForeignCurrencyFairValueHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Foreign exchange forwards/options, hedge liability at fair value | 25us-gaap_ForeignCurrencyFairValueHedgeLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 8us-gaap_ForeignCurrencyFairValueHedgeLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity swaps/options, hedge assets at fair value | 9us-gaap_PriceRiskFairValueHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 4us-gaap_PriceRiskFairValueHedgeAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity swaps/options, hedge liabilities at fair value | 36us-gaap_PriceRiskFairValueHedgeLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 29us-gaap_PriceRiskFairValueHedgeLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Total derivatives accounted for as hedges, hedge assets at fair value | 67us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 31us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Total derivatives accounted for as hedges, hedge liabilities at fair value | 61us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 37us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Maximum term of foreign exchange forwards/options, in months | 21 months | 17 months
Maximum term of commodity swaps/options, in months | 33 months | 36 months
Derivatives not accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange forwards/options at fair value, not accounted for as hedges | 36us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 34us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Foreign exchange forwards/options at fair value, not accounted for as hedges | 56us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 29us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Commodity swaps/options at fair value, not accounted for as hedges | 0us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Commodity swaps/option at fair value, not accounted for as hedges | 0us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Total derivatives not accounted for as hedges, hedge assets at fair value | 36us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 34us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Total derivatives not accounted for as hedges, hedge liabilities at fair value | 56us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 29us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Maximum term of foreign exchange forwards/options, in months | 8 months | 10 months
Maximum term of commodity swaps/options, in months | 1 month | 4 months
Foreign exchange forwards/options | Derivatives accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,162us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 874us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Foreign exchange forwards/options | Derivatives not accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,131us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2,358us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Commodity swaps/options | Derivatives accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 379us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 375us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity swaps/options | Derivatives not accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 10us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 8us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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