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Other Comprehensive Income - Changes in AOCI by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | $ 5,765 | $ 5,292 | $ 6,478
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 9 | (14) | (56)
Income (loss) before income taxes | 488 | 668 | 148
Tax (provision) benefit | (96) | 93 | (11)
Other comprehensive income (loss) | (26) | 156 | (815)
Ending balance | 5,553 | 5,765 | 5,292
Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | (3) |
Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | (6) |
Total AOCI |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (359) | (515) | 300
Other comprehensive income (loss) before reclassifications | (22) | 136 | (871)
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | 4 | (20) | (56)
Other comprehensive income (loss) | (26) | 156 | (815)
Ending balance | (385) | (359) | (515)
Total AOCI | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 8 | (14) | (65)
Interest expense | 1 | 1 |
Income (loss) before income taxes | 6 | (22) | (68)
Tax (provision) benefit | (2) | 2 | 12
Total AOCI | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | (3) |  | (3)
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (202) | (343) | 375
Other comprehensive income (loss) before reclassifications | (43) | 139 | (755)
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | (10) | (2) | (37)
Other comprehensive income (loss) | (33) | 141 | (718)
Ending balance | (235) | (202) | (343)
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | (10) | (1) | (44)
Interest expense | 0 | 0 |
Income (loss) before income taxes | (10) | (1) | (44)
Tax (provision) benefit | 0 | (1) | 7
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | 0 | 0 | 0
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | 0 |
Net Unrealized Gains (Losses) on Investments with: Credit Impairment |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (104) | (110) | (24)
Other comprehensive income (loss) before reclassifications | 20 | (5) | (103)
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | 15 | (11) | (17)
Other comprehensive income (loss) | 5 | 6 | (86)
Ending balance | (99) | (104) | (110)
Net Unrealized Gains (Losses) on Investments with: Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 18 | (13) | (21)
Interest expense | 0 | 0 |
Income (loss) before income taxes | 18 | (13) | (21)
Tax (provision) benefit | (3) | 2 | 4
Net Unrealized Gains (Losses) on Investments with: Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | 0 | 0 | 0
Net Unrealized Gains (Losses) on Investments with: Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | 0 |
ISCR on FG VIEs’ Liabilities with Recourse |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (20) | (23) | (21)
Other comprehensive income (loss) before reclassifications | 0 | 0 | (4)
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | (2) | (3) | (2)
Other comprehensive income (loss) | 2 | 3 | (2)
Ending balance | (18) | (20) | (23)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 0 | 0 | 0
Interest expense | 0 | 0 |
Income (loss) before income taxes | (3) | (3) | (3)
Tax (provision) benefit | 1 | 0 | 1
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | (3) | (3) | (3)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | 0 |
Cumulative Translation Adjustment |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (38) | (45) | (36)
Other comprehensive income (loss) before reclassifications | 1 | 2 | (9)
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | 0 | (5) | 0
Other comprehensive income (loss) | 1 | 7 | (9)
Ending balance | (37) | (38) | (45)
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 0 | 0 | 0
Interest expense | 0 | 0 |
Income (loss) before income taxes | 0 | (6) | 0
Tax (provision) benefit | 0 | 1 | 0
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | 0 | 0 | 0
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | (6) |
Cash Flow Hedge |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | 5 | 6 | 6
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0
Less: Amounts reclassified from AOCI to: |  |  |
Total amount reclassified from AOCI, net of tax | 1 | 1 | 0
Other comprehensive income (loss) | (1) | (1) | 0
Ending balance | 4 | 5 | 6
Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Net realized investment gains (losses) | 0 | 0 | 0
Interest expense | 1 | 1 |
Income (loss) before income taxes | 1 | 1 | 0
Tax (provision) benefit | 0 | 0 | 0
Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs | $ 0 | 0 | $ 0
Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Consolidated Investment Vehicles |  |  |
Less: Amounts reclassified from AOCI to: |  |  |
Fair value gains (losses) on FG VIEs |  | $ 0 |

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