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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Service [Abstract] |  |
Gross | $ 362,345 | $ 367,770
Net | 361,989 | 367,360
Par Outstanding |  |
Gross | 233,709 | 236,765
Net | 233,379 | 236,392
Public finance |  |
Debt Service [Abstract] |  |
Gross | 352,611 | 357,694
Net | 352,285 | 357,314
Par Outstanding |  |
Gross | 224,763 | 227,507
Net | 224,463 | 227,164
Structured finance |  |
Debt Service [Abstract] |  |
Gross | 9,734 | 10,076
Net | 9,704 | 10,046
Par Outstanding |  |
Gross | 8,946 | 9,258
Net | $ 8,916 | $ 9,228

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- Definition Debt Service + References No definition available. + Details
Name: | ago_DebtServiceAbstract
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of insured contractual payments (principal and interest) outstanding on the underlying insured obligations for direct financial guaranty contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of insured contractual payments (principal and interest) outstanding on the underlying insured obligations for financial guaranty contracts, net of ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, gross of ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsOutstandingPrincipalAmountGross
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, after netting out ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Par Outstanding + References No definition available. + Details
Name: | ago_ParOutstandingAbstract
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_UnderlyingAssetClassAxis=ago_PublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_StructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |