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Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions | Jan. 31, 2024 | Dec. 31, 2023 | Aug. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | $ 249,153 | $ 108 | $ 233,258
Puerto Rico |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 1,105 |  | 1,361
Puerto Rico | Puerto Rico Defaulted Exposures Subject to a Plan Support Agreement |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 624 |  | 720
Puerto Rico | Puerto Rico Defaulted Exposures Subject to a Plan Support Agreement | PREPA |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 624 |  | 720
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 372 |  | 509
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Subsequent Event |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Principal amount, paid down | $ 144 |  |  |
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | PRHTA (Transportation revenue) |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 244 |  | 298
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | PRHTA (Highway revenue) |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 128 |  | 182
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Commonwealth of Puerto Rico - GO |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 0 |  | 25
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | PBA |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 0 |  | 4
Puerto Rico | Other Puerto Rico Exposures |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 109 |  | 132
Puerto Rico | Other Puerto Rico Exposures | MFA |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | 108 |  | 131
Puerto Rico | Other Puerto Rico Exposures | PRAASA and U of PR |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |
Net Par Outstanding |  | $ 1 |  | $ 1

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