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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Service
Gross	$ 416,463	$ 398,037
Net	415,966	397,636
Par Outstanding
Gross	262,032	249,535
Net	261,552	249,153
Public finance
Debt Service
Gross	403,789	386,494
Net	403,718	386,419
Par Outstanding
Gross	250,429	239,352
Net	250,375	239,296
Structured finance
Debt Service
Gross	12,674	11,543
Net	12,248	11,217
Par Outstanding
Gross	11,603	10,183
Net	$ 11,177	$ 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: