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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Additional Information (Details) | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) Entity | Jun. 30, 2022 USD ($) Entity | Jun. 30, 2021 USD ($) Entity | Jun. 30, 2022 USD ($) | Jun. 30, 2022 Entity | Jun. 30, 2022 consolidatedInvestmentVehicle | Jun. 30, 2022 policy | Jun. 30, 2022 entity | Dec. 31, 2021 USD ($) | Dec. 31, 2021 Entity | Dec. 31, 2021 consolidatedInvestmentVehicle | Dec. 31, 2021 policy | Dec. 31, 2020 Entity
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  | $ 11,392,000,000 |  |  |  |  | $ 11,708,000,000 |  |  |  |
Estimated Fair Value |  |  |  |  | 7,396,000,000 |  |  |  |  | 8,202,000,000 |  |  |  |
Amortized Cost |  |  |  |  | 7,803,000,000 |  |  |  |  | 7,822,000,000 |  |  |  |
Fixed-maturity securities, trading |  |  |  |  | 87,000,000 |  |  |  |  | 0 |  |  |  |
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt |  |  |  |  | 1,000,000 |  |  |  |  | 1,000,000 |  |  |  |
Assets |  |  |  |  | 16,960,000,000 |  |  |  |  | 18,208,000,000 |  |  |  |
Fair value gains (losses) on credit derivatives | $ 9,000,000 | $ (33,000,000) | $ 6,000,000 | $ (52,000,000) |  |  |  |  |  |  |  |  |  |
Other consolidated VIE assets |  |  |  |  | 89,000,000 |  |  |  |  | 96,000,000 |  |  |  |
Other consolidated VIE liabilities |  |  |  |  | 12,000,000 |  |  |  |  | 11,000,000 |  |  |  |
Number of policies monitored | policy |  |  |  |  |  |  |  | 16,000 |  |  |  |  |  |
Number of policies monitored, not within the scope of ASC 810 | policy |  |  |  |  |  |  |  | 14,000 |  |  |  |  |  |
Number of policies that contain provisions for consolidation | policy |  |  |  |  |  |  |  | 61 |  |  |  |  | 69 |
Pretax income (loss) | (22,000,000) | 125,000,000 | 71,000,000 | 140,000,000 |  |  |  |  |  |  |  |  |  |
Total consolidated | (47,000,000) | 98,000,000 | 19,000,000 | $ 109,000,000 |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Correction of Fair Value | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) | 7,600,000 |  | 6,600,000 |  |  |  |  |  |  |  |  |  |  |
Total consolidated | 6,000,000 |  | 5,200,000 |  |  |  |  |  |  |  |  |  |  |
Incorrect Elimination of Foreign Exchange Remeasurement | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) | 4,400,000 |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |
Total consolidated | 3,400,000 |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |
Joint Healthcare Fund | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |
Consolidated Healthcare Fund | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 71,000,000 |  |  |  |  |  |  |  |  |
Prime Rate | Joint Healthcare Fund | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base interest rate floor |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
EURIBOR | Joint Healthcare Fund | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base interest rate floor |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Financial Guaranty Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loss exposure |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | Entity |  |  |  |  |  | 25 |  |  |  |  | 25 |  |  |
Number of entities consolidated during period | Entity |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number of entities deconsolidated during period | Entity |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |
Change in the instrument specific credit risk of the VIEs' assets | 1,000,000 | 7,000,000 | $ (4,000,000) | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 264,000,000 |  |  |  |  | 260,000,000 |  |  |  |
Financial Guaranty Variable Interest Entities | Puerto Rico | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value |  |  |  |  | 34,000,000 |  |  |  |  |  |  |  |  |
Amortized Cost |  |  |  |  | 37,000,000 |  |  |  |  |  |  |  |  |
Fixed-maturity securities, trading |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |
Trading security losses | $ 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Initial consolidation, gain (loss) |  |  | $ (4,000,000) |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 41,000,000 |  |  |  |  | 0 |  |  |  |
Puerto Rico Trusts | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | entity |  |  |  |  |  |  |  |  | 9 |  |  |  |  |
Custody receipts, notice period | 30 days |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral posting requirement |  |  |  |  | 53,000,000 |  |  |  |  | 49,000,000 |  |  |  |
Fair value gains (losses) on credit derivatives | $ 4,000,000 | $ (1,000,000) | $ 8,000,000 | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated |  | 15 |  | 15 |  | 21 | 21 |  |  |  | 20 | 20 |  | 11
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 777,000,000 |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  | 228,000,000 |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  | 145,000,000 |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles | EURIBOR | Variable Interest Entity, Primary Beneficiary | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Interest Entity, Primary Beneficiary | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles | Maximum | Future Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed capital |  |  | $ 481,000,000 |  |  |  |  |  |  |  |  |  |  |
Consolidated Investment Vehicles | Average |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral posting requirement |  |  |  |  | 51,000,000 |  |  |  |  | 34,000,000 |  |  |  |
Consolidated Investment Vehicles, Meeting Voting Interest Entity Criteria | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | consolidatedInvestmentVehicle |  |  |  |  |  |  | 1 |  |  |  |  | 1 |  |
Assets |  |  |  |  | 60,000,000 |  |  |  |  | $ 12,000,000 |  |  |  |
Fund investments: | Variable Interest Entity, Primary Beneficiary | Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  |  |
Net assets |  |  |  |  | 124,000,000 |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | $ 155,000,000 |  |  |  |  |  |  |  |  |

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