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Outstanding Exposure - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2021 | Mar. 31, 2022 | Mar. 15, 2022 | Jan. 18, 2022 | Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Loss mitigation securities and other |  | $ 1,200 |  |  | $ 1,300
Net par outstanding |  | 233,379 |  |  | 236,392
Residual value insurance policies exposure downgraded |  | 1,616 |  |  | 1,605
Net Exposure |  | 1,090 |  |  | 1,071
Guarantor, maximum exposure |  | 257 |  |  |
Puerto Rico |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 2,237 |  |  | 3,572
Puerto Rico | GO and PBA POA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 41 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1,308 |  |  | 2,643
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 52 |  |  | 1,219
Cash received net of outbound reinsurance |  |  | $ 530 |  |
Recovery bonds received, net |  |  | 605 |  |
Contingent value instruments received, net |  |  | 258 |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Second-to-Pay |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 10 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Assumed |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Direct |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 41 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 47 |  |  | 1,097
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Second-to-Pay |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 10 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Assumed |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Direct |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 36 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 5 |  |  | 122
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Second-to-Pay |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 0 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Assumed |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 0 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Direct |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 5 |  |  |
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | HTA/CCDA PSA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1,256 |  |  | 1,408
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRHTA (Transportation revenue) |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 799 |  |  | 799
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRHTA (Highway revenue) |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 457 |  |  | 457
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | Puerto Rico Convention Center District Authority |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 0 |  |  | 152
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PREPA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 748 |  |  | 748
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRIFA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 0 |  |  | 16
Puerto Rico | Constitutionally Guaranteed | GO |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Litigation amount |  |  |  | $ 35,000 |
Puerto Rico | Constitutionally Guaranteed | GO and PBA POA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Amount of outstanding principal to be paid, in percent | 100.00% |  |  |  |
Puerto Rico | Constitutionally Guaranteed | PRCCDA and PRIFA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Cash received for bonds |  |  | 47 |  |
Notional amount of contingent value instrument received for bonds |  |  | $ 98 |  |
Puerto Rico | Pension Obligations | GO |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Litigation amount |  |  |  | $ 50,000 |
Puerto Rico | Other Public Corporations | University of Puerto Rico |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1 |  |  |
Puerto Rico | Other Public Corporations | PRASA (Puerto Rico Aqueduct and Sewer Authority) |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1 |  |  |
Puerto Rico | PRHTA |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 1,300 |  |  |
U.S. Virgin Islands |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 443 |  |  |
Principal amount upgraded (downgraded) |  | 256 |  |  |
Public finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 224,463 |  |  | 227,164
Structured finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 8,916 |  |  | 9,228
Commitment to Provide Guarantees | Public finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Outstanding commitments to provide guaranties |  | 1,174 |  |  |
Commitment to Provide Guarantees | Structured finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Outstanding commitments to provide guaranties |  | $ 860 |  |  |
BIG |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Maximum period of liquidity claims (in years) |  | 1 year |  |  |
Net par outstanding |  | $ 5,639 |  |  | 7,356
Residual value insurance policies exposure downgraded |  | 144 |  |  | 144
Net Exposure |  | 84 |  |  | 84
BIG | Puerto Rico |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 2,237 |  |  | 3,572
Decrease in net par outstanding |  | 1,335 |  |  |
BIG | U.S. Virgin Islands |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 185 |  |  | 469
BIG | Public finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | 4,295 |  |  | 5,972
BIG | Structured finance |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Net par outstanding |  | $ 1,344 |  |  | $ 1,384
Minimum |  |  |  |  |
Schedule of Insured Financial Obligations [Line Items] |  |  |  |  |
Probability of paying more claims than being reimbursed (as a percent) |  | 50.00% |  |  |

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