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Contracts Accounted for as Credit Derivatives - Credit Derivatives Net Par Outstanding by Sector (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	$ 4,212	$ 3,608
Net Fair Value Asset (Liability)	(29)	(50)
Public finance | U.S.
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	1,025	1,149
Net Fair Value Asset (Liability)	(12)	(15)
Public finance | Non U.S.
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	2,044	1,522
Net Fair Value Asset (Liability)	(15)	(20)
Structured finance | U.S.
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	150	322
Net Fair Value Asset (Liability)	(2)	(13)
Structured finance | Non U.S.
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	993	615
Net Fair Value Asset (Liability)	$ 0	$ (2)

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- References

No definition available.

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- 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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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (c)
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

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