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Long-Term Debt and Credit Facilities - Expected Maturity Schedule of Debt (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 $ 7,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 2,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 1,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
2020-2039 700,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive  
2040-2059 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive  
2060-2079 450,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive  
Thereafter 430,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive  
Total 1,596,000,000us-gaap_DebtInstrumentFaceAmount 1,114,000,000us-gaap_DebtInstrumentFaceAmount
AGUS [Member]    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2020-2039 700,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2040-2059 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
2060-2079 150,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
Thereafter 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
 
Total 850,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
350,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyUSHoldingIncMember
AGMH [Member]    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2020-2039 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2040-2059 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
2060-2079 300,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
Thereafter 430,000,000ago_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
 
Total 730,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
730,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalHoldingsIncMember
AGM [Member]    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 7,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2016 3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2017 3,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2018 2,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2019 1,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2020-2039 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2040-2059 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
2060-2079 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
Thereafter 0ago_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
 
Total $ 16,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
$ 34,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember