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Outstanding Exposure - BIG Net Par Outstanding (Details) $ in Millions	Mar. 31, 2024 USD ($) risk	Dec. 31, 2023 USD ($) risk
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, credit derivative	$ 3,421	$ 3,608
Net	248,144	249,153
BIG
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	5,141	5,383
Net par outstanding, credit derivative	52	54
Net	$ 5,193	$ 5,437
Number of risks, financial guaranty insurance | risk	212	217
Number of risks, credit derivative | risk	11	11
Number of risks | risk	223	228
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,356	$ 2,394
Net par outstanding, credit derivative	15	16
Net	$ 2,371	$ 2,410
Number of risks, financial guaranty insurance | risk	91	95
Number of risks, credit derivative | risk	2	2
Number of risks | risk	93	97
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 977	$ 979
Net par outstanding, credit derivative	10	10
Net	$ 987	$ 989
Number of risks, financial guaranty insurance | risk	12	13
Number of risks, credit derivative | risk	2	2
Number of risks | risk	14	15
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 1,808	$ 2,010
Net par outstanding, credit derivative	27	28
Net	$ 1,835	$ 2,038
Number of risks, financial guaranty insurance | risk	109	109
Number of risks, credit derivative | risk	7	7
Number of risks | risk	116	116

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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Balance Type:	na
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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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Namespace Prefix:	ago_
Data Type:	xbrli:monetaryItemType
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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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X

- 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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