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Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]
Net	$ 258,196	$ 249,153
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net	851	1,105
Puerto Rico | Puerto Rico Defaulted Exposures Subject to a Plan Support Agreement | Puerto Rico Electric Power Authority
Schedule of Insured Financial Obligations [Line Items]
Net	531	624
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement
Schedule of Insured Financial Obligations [Line Items]
Net	228	372
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Puerto Rico Transportation Authority
Schedule of Insured Financial Obligations [Line Items]
Net	204	244
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Puerto Rico Highways Authority
Schedule of Insured Financial Obligations [Line Items]
Net	24	128
Puerto Rico | Other Puerto Rico Exposure
Schedule of Insured Financial Obligations [Line Items]
Net	92	109
Puerto Rico | Other Puerto Rico Exposure | MFA
Schedule of Insured Financial Obligations [Line Items]
Net	91	108
Puerto Rico | Other Puerto Rico Exposure | PRASA and U of PR
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1	$ 1

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- Definition

Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, after netting out ceded contracts.

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- Definition

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

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