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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Redeemable Noncontrolling Interest of Consolidated Investment Vehicle (Details) - Consolidated Investment Vehicles - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Redeemable Noncontrolling Interest, Equity, Other, Fair Value, Rollforward [Roll Forward]
Beginning balance	$ 22	$ 21
Net income (loss) attributable to the redeemable noncontrolling interest	(1)	0
Ending balance	$ 21	$ 21

X

- Definition

Redeemable Noncontrolling Interest, Equity, Other, Fair Value, Rollforward [Roll Forward]

+ References

No definition available.

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- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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- Definition

Fair value of noncontrolling interests which are redeemable by the parent entity and classified as other equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
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