| **Derivative Financial Instruments and Risk Management (Details 2) (USD $)In Millions, unless otherwise specified** | Mar. 31, 2015                                                                                                                                                                                                                                                                | Dec. 31, 2014                                                                                                                                                                                                                                                                |
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| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset Fair Value                                                                                                    | $ 112us-gaap_DerivativeFairValueOfDerivativeAsset                                                                                                                                                                                                                            | $ 101us-gaap_DerivativeFairValueOfDerivativeAsset                                                                                                                                                                                                                            |
| Liability Fair Value                                                                                                | (24)us-gaap_DerivativeFairValueOfDerivativeLiability                                                                                                                                                                                                                         | (23)us-gaap_DerivativeFairValueOfDerivativeLiability                                                                                                                                                                                                                         |
| Designated derivatives                                                                                              |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset (Liability) Fair Value                                                                                        | 71us-gaap_DerivativeFairValueOfDerivativeNet/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember                                                                                                                                                    | 71us-gaap_DerivativeFairValueOfDerivativeNet/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember                                                                                                                                                    |
| Designated derivatives | Interest rate contracts | Other assets                                                     |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset Fair Value                                                                                                    | 77us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_InterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember           | 79us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_InterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember           |
| Designated derivatives | Interest rate contracts | Accrued expenses                                                 |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Liability Fair Value                                                                                                | (6)us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_InterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember | (8)us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_InterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_DesignatedAsHedgingInstrumentMember |
| Undesignated derivatives                                                                                            |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset (Liability) Fair Value                                                                                        | 17us-gaap_DerivativeFairValueOfDerivativeNet/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember                                                                                                                                                                    | 7us-gaap_DerivativeFairValueOfDerivativeNet/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember                                                                                                                                                                     |
| Undesignated derivatives | Foreign exchange contracts | Other assets                                                |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset Fair Value                                                                                                    | 8us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember                         | 5us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember                         |
| Undesignated derivatives | Foreign exchange contracts | Accrued expenses                                            |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Liability Fair Value                                                                                                | (18)us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember             | (15)us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember             |
| Undesignated derivatives | Cross currency contracts | Other assets                                                  |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| **Derivatives, Fair Value**                                                                                         |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                         |
| Asset Fair Value                                                                                                    | $ 27us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember            | $ 17us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_HedgingDesignationAxis= us-gaap_NondesignatedMember            |

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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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
+ References
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| - Definition
Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
+ References
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| - Definition
Fair value of the assets less the liabilities of a derivative or group of derivatives.
+ References
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