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Financial Guaranty Insurance Premiums - Components of Unearned Premium Reserve (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financial Guarantee Insurance Premiums [Line Items]    
Unearned premium reserve, gross $ 4,127us-gaap_UnearnedPremiums $ 4,261us-gaap_UnearnedPremiums
Unearned premium reserve, ceded 365us-gaap_PrepaidReinsurancePremiums 381us-gaap_PrepaidReinsurancePremiums
Total net unearned premium reserve related to FG VIE 125ago_VariableInterestEntityUnearnedPremiumsExcludingClaimsPaidNotYetExpensedNet 125ago_VariableInterestEntityUnearnedPremiumsExcludingClaimsPaidNotYetExpensedNet
Contra-paid related to FG and VIEs 41ago_FinancialGuaranteeInsuranceContractsPrepaidLossesRelatedtoVariableInterestEntities 42ago_FinancialGuaranteeInsuranceContractsPrepaidLossesRelatedtoVariableInterestEntities
Consolidated Entity Excluding Consolidation of Variable Interest Entities (VIE) [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Deferred premium revenue, gross 4,039ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 4,167ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Deferred premium revenue, ceded 370ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 387ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Deferred premium revenue, net 3,669ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1] 3,780ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1]
Contra-paid, gross 88ago_FinancialGuaranteeInsuranceContractsPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [2] 94ago_FinancialGuaranteeInsuranceContractsPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [2]
Contra-paid, ceded (5)ago_FinancialGuaranteeInsuranceContractsCededPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [2] (6)ago_FinancialGuaranteeInsuranceContractsCededPrepaidLosses
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [2]
Contra-paid, net 93ago_FinancialGuaranteeInsuranceContractsPrepaidLossesNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1],[2] 100ago_FinancialGuaranteeInsuranceContractsPrepaidLossesNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1],[2]
Unearned premium reserve, gross 4,127us-gaap_UnearnedPremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 4,261us-gaap_UnearnedPremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Unearned premium reserve, ceded 365us-gaap_PrepaidReinsurancePremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 381us-gaap_PrepaidReinsurancePremiums
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
Unearned premium reserve, net 3,762ago_UnearnedPremiumsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1] 3,880ago_UnearnedPremiumsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember		 [1]
Financial Guarantee Insurance Product Line [Member]    
Financial Guarantee Insurance Premiums [Line Items]    
Contra-paid, net 93ago_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 4,038ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 4,167ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Deferred premium revenue, ceded 370ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 387ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Deferred premium revenue, net 3,668ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember		 [1],[3] 3,780ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ 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 1ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 0ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedGross
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember
Deferred premium revenue, ceded 0ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 0ago_FinancialGuaranteeInsuranceContractsPrepaidReinsurancePremiumsExcludingCededClaimsNotYetExpensed
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember
Deferred premium revenue, net $ 1ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 [1] $ 0ago_FinancialGuaranteeInsuranceContractsUnearnedPremiumRevenueExcludingClaimsPaidNotYetExpensedNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_OtherInsuranceProductLineMember		 [1]
[1] Excludes $125 million and $125 million of deferred premium revenue, and $41 million and $42 million of contra-paid related to FG VIEs as of March 31, 2015 and December 31, 2014, respectively.
[2] See Note 6, "Financial Guaranty Insurance Losses– Insurance Contracts' Loss Information" for an explanation of "contra-paid".
[3] Excludes scheduled net earned premiums on consolidated FG VIEs of $125 million