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Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 254,396 | $ 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
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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