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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

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: