| **Investments Derivative Financial Instruments (Details) (USD $)In Millions, unless otherwise specified** | Mar. 31, 2015                                                                                                                                                                                                | Dec. 31, 2014                                                                                                                                                                                                |
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| **Derivative [Line Items]**                                                                               |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| Estimated fair value asset                                                                                | $ 2us-gaap_DerivativeFairValueOfDerivativeAsset                                                                                                                                                              | $ 0us-gaap_DerivativeFairValueOfDerivativeAsset                                                                                                                                                              |
| Estimated fair value liability                                                                            | 5us-gaap_DerivativeFairValueOfDerivativeLiability                                                                                                                                                            | 3us-gaap_DerivativeFairValueOfDerivativeLiability                                                                                                                                                            |
| Not Designated as Hedging Instrument [Member] | Currency forwards [Member]                                |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| **Derivative [Line Items]**                                                                               |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| Derivative, Notional Amount                                                                               | 18invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                                   | 9invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                                    |
| Estimated fair value asset                                                                                | 2us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                       | 0us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                       |
| Estimated fair value liability                                                                            | 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                   | 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_ForeignExchangeForwardMember                   |
| Not Designated as Hedging Instrument [Member] | Equity warrants [Member]                                  |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| **Derivative [Line Items]**                                                                               |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| Derivative, Notional Amount                                                                               | 5invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                                   | 5invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                                   |
| Estimated fair value asset                                                                                | 0us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                      | 0us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                      |
| Estimated fair value liability                                                                            | 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                  | 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_WarrantMember                                  |
| Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member]        |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| **Derivative [Line Items]**                                                                               |                                                                                                                                                                                                         |                                                                                                                                                                                                         |
| Derivative, Notional Amount                                                                               | 184invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember                  | 184invest_DerivativeNotionalAmount/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember                  |
| Estimated fair value asset                                                                                | 0us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember       | 0us-gaap_DerivativeFairValueOfDerivativeAsset/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember       |
| Estimated fair value liability                                                                            | $ 5us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | $ 3us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_DerivativeByNatureAxis= us-gaap_NondesignatedMember/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |

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| - Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B
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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
Reference 1: 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=34720828&loc=SL20225862-175312Reference 2: 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=35706170&loc=SL5624163-113959Reference 3: 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=36459792&loc=SL20226000-175313
+ Details**Name:**us-gaap_DerivativeFairValueOfDerivativeAsset**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
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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
Reference 1: 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=34720828&loc=SL20225862-175312Reference 2: 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=35706170&loc=SL5624163-113959Reference 3: 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=36459792&loc=SL20226000-175313
+ Details**Name:**us-gaap_DerivativeFairValueOfDerivativeLiability**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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| - Details**Name:**us-gaap_DerivativeLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Details**Name:**us-gaap_DerivativeByNatureAxis=us-gaap_NondesignatedMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |