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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Service |  |
Gross | $ 395,350 | $ 398,037
Net | 394,849 | 397,636
Par Outstanding |  |
Gross | 248,626 | 249,535
Net | 248,144 | 249,153
Public finance |  |
Debt Service |  |
Gross | 383,723 | 386,494
Net | 383,648 | 386,419
Par Outstanding |  |
Gross | 238,188 | 239,352
Net | 238,132 | 239,296
Structured finance |  |
Debt Service |  |
Gross | 11,627 | 11,543
Net | 11,201 | 11,217
Par Outstanding |  |
Gross | 10,438 | 10,183
Net | $ 10,012 | $ 9,857

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: |