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Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Jan. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | $ 248,144 |  | $ 249,153
Puerto Rico |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | 961 |  | 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 | 624 |  | 624
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | 228 |  | 372
Insured financial obligations, principal amount, paid down |  | $ 144 |
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 | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | PRHTA |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | 228 |  |
Puerto Rico | Other Puerto Rico Exposure |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | 109 |  | 109
Puerto Rico | Other Puerto Rico Exposure | MFA |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |
Net | 108 |  | 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. + References No definition available. + Details
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