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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Service
Gross	$ 439,263	$ 416,463
Net	438,764	415,966
Par Outstanding
Gross	275,355	262,032
Net	274,875	261,552
Public finance
Debt Service
Gross	426,334	403,789
Net	426,261	403,718
Par Outstanding
Gross	263,472	250,429
Net	263,418	250,375
Structured finance
Debt Service
Gross	12,929	12,674
Net	12,503	12,248
Par Outstanding
Gross	11,883	11,603
Net	$ 11,457	$ 11,177

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: