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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule II. Condensed Financial Information of Registrant (Narrative)) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,900us-gaap_GuaranteeObligationsMaximumExposure  
Guarantor Obligations, Current Carrying Value 5us-gaap_GuaranteeObligationsCurrentCarryingValue 7us-gaap_GuaranteeObligationsCurrentCarryingValue
Parent Company [Member]    
Guarantor Obligations, Maximum Exposure, Undiscounted 1,900us-gaap_GuaranteeObligationsMaximumExposure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Guarantor Obligations, Current Carrying Value 5us-gaap_GuaranteeObligationsCurrentCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Indemnification Agreement [Member] | Parent Company [Member]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 625us-gaap_GuaranteeObligationsMaximumExposure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_IndemnificationGuaranteeMember