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Financial Guaranty Insurance Premiums - Components of Unearned Premium Reserve (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Guarantee Insurance Premiums [Line Items]    
Unearned premium reserve, gross $ 4,261us-gaap_UnearnedPremiums $ 4,595us-gaap_UnearnedPremiums
Unearned premium reserve, ceded 381us-gaap_PrepaidReinsurancePremiums 452us-gaap_PrepaidReinsurancePremiums
Total net unearned premium reserve related to FG VIE 125ago_VariableInterestEntityUnearnedPremiumsNet 187ago_VariableInterestEntityUnearnedPremiumsNet
Contra-paid related to FG and VIEs 42ago_FinancialGuaranteeInsuranceContractsPrepaidLossesRelatedtoVariableInterestEntities 55ago_FinancialGuaranteeInsuranceContractsPrepaidLossesRelatedtoVariableInterestEntities
Consolidated Entity Excluding Consolidation of Variable Interest Entities (VIE) [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, gross 4,167ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 4,652ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Deferred premium revenue, ceded 387ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 470ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Deferred premium revenue, net 3,780ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1],[2] 4,182ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1]
Contra-paid, gross 94ago_FinancialGuaranteeInsuranceContractsPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [3] (57)ago_FinancialGuaranteeInsuranceContractsPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [3]
Contra-paid, ceded (6)ago_FinancialGuaranteeInsuranceContractsCededPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [3] (18)ago_FinancialGuaranteeInsuranceContractsCededPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [3]
Contra-paid, net 100ago_FinancialGuaranteeInsuranceContractsPrepaidLossesNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1],[3] (39)ago_FinancialGuaranteeInsuranceContractsPrepaidLossesNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1],[3]
Unearned premium reserve, gross 4,261us-gaap_UnearnedPremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 4,595us-gaap_UnearnedPremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Unearned premium reserve, ceded 381us-gaap_PrepaidReinsurancePremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 452us-gaap_PrepaidReinsurancePremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Unearned premium reserve, net 3,880ago_UnearnedPremiumsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1] 4,143ago_UnearnedPremiumsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1]
Financial Guarantee Insurance Product Line [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Contra-paid, net 100ago_FinancialGuaranteeInsuranceContractsPrepaidLossesNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		  
Financial Guarantee Insurance Product Line [Member] | Consolidated Entity Excluding Consolidation of Variable Interest Entities (VIE) [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, gross 4,167ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 4,647ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Deferred premium revenue, ceded 387ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 470ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Deferred premium revenue, net 3,780ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 [1] 4,177ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 [1]
Other Insurance Product Line [Member] | Consolidated Entity Excluding Consolidation of Variable Interest Entities (VIE) [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, gross 0ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 5ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember
Deferred premium revenue, ceded 0ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 0ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsIncludingCededLiabilityforClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember
Deferred premium revenue, net $ 0ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 [1] $ 5ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueIncludingLiabilityforClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 [1]
[1] Excludes $125 million and $187 million deferred premium revenue and $42 million and $55 million of contra-paid related to FG VIEs as of December 31, 2014 and December 31, 2013, respectively.
[2] Excludes scheduled net earned premiums on consolidated FG VIEs of $125 million
[3] See Note 7, "Financial Guaranty Insurance Losses– Insurance Contracts' Loss Information" for an explanation of "contra-paid".