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Outstanding Exposure - Expected Amortization of Net Par Outstanding (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Expected Amortization of Net Par Outstanding [Abstract]    
0 to 5 years $ 134,913ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountZerotoFiveYears  
5 to 10 years 80,733ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFivetoTenYears  
10 to 15 years 70,228ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTentoFifteenYears  
15 to 20 years 53,551ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFifteentoTwentyYears  
20 years and above 64,304ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTwentyandAboveYears  
Net Par Outstanding (excluding loss mitigation bonds) 403,729ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet [1] 459,107ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet [2]
Public Finance [Member]    
Expected Amortization of Net Par Outstanding [Abstract]    
0 to 5 years 98,431ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountZerotoFiveYears
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		  
5 to 10 years 75,279ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFivetoTenYears
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		  
10 to 15 years 67,354ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTentoFifteenYears
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		  
15 to 20 years 51,139ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFifteentoTwentyYears
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		  
20 years and above 61,279ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTwentyandAboveYears
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		  
Net Par Outstanding (excluding loss mitigation bonds) 353,482ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember		 386,179ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
/ us-gaap_UnderlyingAssetClassAxis
= ago_PublicFinanceMember
Structured Finance [Member]    
Expected Amortization of Net Par Outstanding [Abstract]    
0 to 5 years 36,482ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountZerotoFiveYears
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		  
5 to 10 years 5,454ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFivetoTenYears
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		  
10 to 15 years 2,874ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTentoFifteenYears
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		  
15 to 20 years 2,412ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFifteentoTwentyYears
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		  
20 years and above 3,025ago_InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTwentyandAboveYears
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		  
Net Par Outstanding (excluding loss mitigation bonds) $ 50,247ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember		 $ 72,928ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_StructuredFinanceMember
[1] Excludes $1.3 billion of loss mitigation securities insured and held by the Company as of December 31, 2014, which are primarily in the BIG category.
[2] Excludes $1.2 billion of loss mitigation securities insured and held by the Company as of December 31, 2013, which are primarily in the BIG category.