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Derivatives and Hedging - Offsetting of financial assets and derivatives assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | $ 46 us-gaap_DerivativeFairValueOfDerivativeAsset |  | $ 80 us-gaap_DerivativeFairValueOfDerivativeAsset |
Gross Amounts Offset in the Statement of Financial Position | (14)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets |  | (30)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets |
Net Amounts of Assets Presented in the Statement of Financial Position | 32 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | [1] | 50 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | [1]
Other Current Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 24 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember |  | 46 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember |
Net Amounts of Assets Presented in the Statement of Financial Position | 12 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember |  | 18 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember |
Other Noncurrent Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 22 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember |  | 34 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember |
Net Amounts of Assets Presented in the Statement of Financial Position | 20 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember |  | 32 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember |
Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 46 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2] | 80 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2]
Gross Amounts Offset in the Statement of Financial Position | (14)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | (30)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Net Amounts of Assets Presented in the Statement of Financial Position | 32 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1] | 50 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1]
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2] | 9 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2]
Gross Amounts Offset in the Statement of Financial Position | 0 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 0 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Net Amounts of Assets Presented in the Statement of Financial Position | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1] | 9 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1]
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 46 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2] | 71 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [2]
Gross Amounts Offset in the Statement of Financial Position | (14)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | (30)us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Net Amounts of Assets Presented in the Statement of Financial Position | 32 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1] | 41 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1]
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 46 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [2] | 80 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [2]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [2],[3] | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [2],[3]
Gross Amounts Offset in the Statement of Financial Position | 0 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 0 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net Amounts of Assets Presented in the Statement of Financial Position | $ 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | $ 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
[1] | Included within Other current assets ($12 million in 2014 and $18 million in 2013, respectively) or Other non-current assets ($20 million in 2014 and $32 million in 2013, respectively)
[2] | Included within Other current assets ($24 million in 2014 and $46 million in 2013, respectively) or Other non-current assets ($22 million in 2014 and $34 million in 2013, respectively)
[3] | These contracts typically are for 30 day durations and executed close to the last day of the most recent reporting month, thereby resulting in nominal fair values at the balance sheet date.

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- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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