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Outstanding Exposure - BIG Net Par Outstanding (Details) $ in Millions	Mar. 31, 2022 USD ($) risk	Dec. 31, 2021 USD ($) risk
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, credit derivative	$ 3,574	$ 4,040
Total	233,379	236,392
BIG
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	5,579	7,293
Net par outstanding, credit derivative	60	63
Total	$ 5,639	$ 7,356
Number of risks, financial guaranty insurance | risk	255	262
Number of risks, credit derivative | risk	11	11
Number of risks | risk	266	273
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,027	$ 2,429
Net par outstanding, credit derivative	6	14
Total	$ 2,033	$ 2,443
Number of risks, financial guaranty insurance | risk	108	117
Number of risks, credit derivative | risk	1	2
Number of risks | risk	109	119
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 225	$ 177
Net par outstanding, credit derivative	11	4
Total	$ 236	$ 181
Number of risks, financial guaranty insurance | risk	20	16
Number of risks, credit derivative | risk	2	1
Number of risks | risk	22	17
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 3,327	$ 4,687
Net par outstanding, credit derivative	43	45
Total	$ 3,370	$ 4,732
Number of risks, financial guaranty insurance | risk	127	129
Number of risks, credit derivative | risk	8	8
Number of risks | risk	135	137

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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X

- Definition

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

+ References

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+ Details

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- 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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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

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- Definition

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

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 9
-Subparagraph (a)(5)(i)
-URI http://asc.fasb.org/extlink&oid=99382878&loc=SL5749324-161292

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 55
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=99379334&loc=SL5751133-161288

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