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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Service |  |
Gross | $ 370,172 | $ 367,770
Net | 369,951 | 367,360
Par Outstanding |  |
Gross | 233,438 | 236,765
Net | 233,258 | 236,392
Public finance |  |
Debt Service |  |
Gross | 359,899 | 357,694
Net | 359,703 | 357,314
Par Outstanding |  |
Gross | 224,254 | 227,507
Net | 224,099 | 227,164
Structured finance |  |
Debt Service |  |
Gross | 10,273 | 10,076
Net | 10,248 | 10,046
Par Outstanding |  |
Gross | 9,184 | 9,258
Net | $ 9,159 | $ 9,228

X
- 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

X
- 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: |