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Consolidated Reinsurance (Consolidated Reinsurance - Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Reinsurance      
Reinsurance ceded $ 1,252us-gaap_CededPremiumsEarned $ 1,284us-gaap_CededPremiumsEarned $ 1,291us-gaap_CededPremiumsEarned
Reinsurance assumed 1,673us-gaap_AssumedPremiumsEarned 1,469us-gaap_AssumedPremiumsEarned 1,350us-gaap_AssumedPremiumsEarned
Assumed 830,980us-gaap_LifeInsuranceInForceAssumed 844,946us-gaap_LifeInsuranceInForceAssumed 785,391us-gaap_LifeInsuranceInForceAssumed
Ceded 372,886us-gaap_LifeInsuranceInForceCeded 401,576us-gaap_LifeInsuranceInForceCeded 417,026us-gaap_LifeInsuranceInForceCeded
Affiliated Entity [Member]      
Consolidated Reinsurance      
Assumed 277,900us-gaap_LifeInsuranceInForceAssumed
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember		 259,600us-gaap_LifeInsuranceInForceAssumed
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember		 230,600us-gaap_LifeInsuranceInForceAssumed
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
Ceded 23,900us-gaap_LifeInsuranceInForceCeded
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember		 26,100us-gaap_LifeInsuranceInForceCeded
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember		 27,400us-gaap_LifeInsuranceInForceCeded
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
Life insurance (1)      
Consolidated Reinsurance      
Reinsurance ceded 1,159us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 1,187us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 756us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Reinsurance assumed 1,630us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 1,423us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 794us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Life insurance (1) | Affiliated Entity [Member]      
Consolidated Reinsurance      
Reinsurance ceded 36us-gaap_CededPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 45us-gaap_CededPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 54us-gaap_CededPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Reinsurance assumed $ 681us-gaap_AssumedPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 $ 451us-gaap_AssumedPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember		 $ 319us-gaap_AssumedPremiumsEarned
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember