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Outstanding Exposure - BIG Net Par Outstanding (Details) $ in Millions	Jun. 30, 2023 USD ($) risk	Dec. 31, 2022 USD ($) risk
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, credit derivative	$ 3,205	$ 3,203
Net	244,013	233,258
BIG
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	5,578	5,835
Net par outstanding, credit derivative	56	57
Net	$ 5,634	$ 5,892
Number of risks, financial guaranty insurance | risk	232	247
Number of risks, credit derivative | risk	11	13
Number of risks | risk	243	260
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,320	$ 3,357
Net par outstanding, credit derivative	6	6
Net	$ 2,326	$ 3,363
Number of risks, financial guaranty insurance | risk	107	122
Number of risks, credit derivative | risk	1	1
Number of risks | risk	108	123
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 989	$ 171
Net par outstanding, credit derivative	10	10
Net	$ 999	$ 181
Number of risks, financial guaranty insurance | risk	16	14
Number of risks, credit derivative | risk	2	2
Number of risks | risk	18	16
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,269	$ 2,307
Net par outstanding, credit derivative	40	41
Net	$ 2,309	$ 2,348
Number of risks, financial guaranty insurance | risk	109	111
Number of risks, credit derivative | risk	8	10
Number of risks | risk	117	121

X

- Definition

Represents the number of unique credits in the insured portfolio accounted for as credit derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
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X

- Definition

Represents the outstanding principal amounts of the underlying insured obligations that are accounted for as credit derivatives, net of protection purchased.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of unique credits in the insured portfolio.

+ References

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+ Details

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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

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Namespace Prefix:	ago_
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X

- Definition

This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guaranty insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guaranty insurance contracts, before adjusting for the effect of consolidating VIEs.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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X

- Definition

This element represents the number of issued and outstanding contracts for each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 55
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-32

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 9
-Subparagraph (a)(5)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-9

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