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Outstanding Exposure - BIG Net Par Outstanding (Details) $ in Millions	Dec. 31, 2023 USD ($) risk	Aug. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) risk
Schedule of Insured Financial Obligations [Line Items]
Credit derivative, net par outstanding	$ 3,608		$ 3,203
Total net par outstanding	$ 249,153	$ 108	233,258
Number of Risks | risk	7,754
BIG
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 5,383		5,835
Credit derivative, net par outstanding	54		57
Total net par outstanding	$ 5,437		$ 5,892
Number of risks, financial guaranty insurance | risk	217		247
Number of risks, credit derivative | risk	11		13
Number of Risks | risk	228		260
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,394		$ 3,357
Credit derivative, net par outstanding	16		6
Total net par outstanding	$ 2,410		$ 3,363
Number of risks, financial guaranty insurance | risk	95		122
Number of risks, credit derivative | risk	2		1
Number of Risks | risk	97		123
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 979		$ 171
Credit derivative, net par outstanding	10		10
Total net par outstanding	$ 989		$ 181
Number of risks, financial guaranty insurance | risk	13		14
Number of risks, credit derivative | risk	2		2
Number of Risks | risk	15		16
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,010		$ 2,307
Credit derivative, net par outstanding	28		41
Total net par outstanding	$ 2,038		$ 2,348
Number of risks, financial guaranty insurance | risk	109		111
Number of risks, credit derivative | risk	7		10
Number of Risks | risk	116		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

No definition available.

+ 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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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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