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Outstanding Exposure - Puerto Rico Gross Par and Gross Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Exposure to Puerto Rico	$ 242,009	$ 233,438
Gross	384,198	370,172
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Exposure to Puerto Rico	1,121	1,378
Gross	$ 1,529	$ 1,899

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

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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

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Namespace Prefix:	ago_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

[Line Items] for Schedule of Insured Financial Obligations [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=country_PR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: