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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Unpaid Principal (Details) (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
FG VIEs’ liabilities with recourse	$ 21	$ 12
FG VIEs’ liabilities without recourse	15	15
Unpaid principal for FG VIEs’ liabilities with recourse	723	281
Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
FG VIEs’ assets	265	255
Unpaid principal balance for FG VIEs’ assets that were 90 days or more past due	$ 34	$ 52

X

- Definition

Fair Value, Option, Liabilities with Recourse, Unpaid Principal Balance

+ References

No definition available.

+ Details

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- Definition

Fair Value, Option, Loans Held as Liabilities, Aggregate Difference, With Recourse

+ References

No definition available.

+ Details

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- Definition

Fair Value, Option, Loans Held as Liabilities, Aggregate Difference, Without Recourse

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
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X

- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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X

- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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