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Shareholders' Equity - Changes in AOCI by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | $ 5,713 |
Other comprehensive income (loss) before reclassifications | $ 158 |  | $ (120) | 125 | $ (74)
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | 0 |  | (9) | 2 | (20)
Interest expense | 22 |  | 24 | 68 | 67
Income (loss) before income taxes | 220 |  | 202 | 458 | 466
Tax (provision) benefit | (44) |  | (43) | (88) | (84)
Other comprehensive income (loss) | 161 |  | (107) | 128 | (50)
Ending balance | 5,728 | $ 5,713 |  | 5,728 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | (1) |  | (9) | 1 | (20)
Interest expense |  |  |  |  | 1
Income (loss) before income taxes | (2) |  | (15) | (1) | (27)
Tax (provision) benefit | (1) |  | 2 | (2) | 3
Total amount reclassified from AOCI, net of tax | (3) |  | (13) | (3) | (24)
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 |  |  |  | (2) | (2)
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) |  | (6)
Total AOCI |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | (392) | (565) | (458) | (359) | (515)
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Ending balance | (231) | (359) | (565) | (231) | (565)
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 | (1) |  |  |  |
No Credit Impairment |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | (243) | (397) | (284) | (202) | (343)
Other comprehensive income (loss) before reclassifications | 147 |  | (115) | 101 | (54)
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Other comprehensive income (loss) | 152 |  | (113) | 111 | (54)
Ending balance | (91) | (202) | (397) | (91) | (397)
No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | (4) |  | (2) | (10) | 2
Interest expense |  |  |  |  | 0
Income (loss) before income taxes | (4) |  | (2) | (10) | 2
Tax (provision) benefit | (1) |  | 0 | 0 | (2)
Total amount reclassified from AOCI, net of tax | (5) |  | (2) | (10) | 0
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
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 |  | 0
Credit Impairment |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | (96) | (123) | (115) | (104) | (110)
Other comprehensive income (loss) before reclassifications | 13 |  | (14) | 27 | (31)
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Other comprehensive income (loss) | 10 |  | (8) | 18 | (13)
Ending balance | (86) | (104) | (123) | (86) | (123)
Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | 3 |  | (7) | 11 | (22)
Interest expense |  |  |  |  | 0
Income (loss) before income taxes | 3 |  | (7) | 11 | (22)
Tax (provision) benefit | 0 |  | 1 | (2) | 4
Total amount reclassified from AOCI, net of tax | 3 |  | (6) | 9 | (18)
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
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 |  | 0
ISCR on FG VIEs’ Liabilities with Recourse |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | (20) | (12) | (22) | (20) | (23)
Other comprehensive income (loss) before reclassifications | (2) |  | 10 | (3) | 9
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Other comprehensive income (loss) | (1) |  | 10 | (1) | 11
Ending balance | (21) | (20) | (12) | (21) | (12)
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 | 0
Interest expense |  |  |  |  | 0
Income (loss) before income taxes | (1) |  | 0 | (2) | (2)
Tax (provision) benefit | 0 |  | 0 | 0 | 0
Total amount reclassified from AOCI, net of tax | (1) |  | 0 | (2) | (2)
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 | (1) |  |  | (2) | (2)
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 |  | 0
Cumulative Translation Adjustment |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | (38) | (38) | (42) | (38) | (45)
Other comprehensive income (loss) before reclassifications | 0 |  | (1) | 0 | 2
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Other comprehensive income (loss) | 0 |  | 4 | 0 | 7
Ending balance | (38) | (38) | (38) | (38) | (38)
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | 0 |  | 0 | 0 | 0
Interest expense |  |  |  |  | 0
Income (loss) before income taxes | 0 |  | (6) | 0 | (6)
Tax (provision) benefit | 0 |  | 1 | 0 | 1
Total amount reclassified from AOCI, net of tax | 0 |  | (5) | 0 | (5)
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) |  | (6)
Cash Flow Hedge |  |  |  |  |
Changes in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Beginning balance | 5 | 5 | 5 | 5 | 6
Other comprehensive income (loss) before reclassifications | 0 |  | 0 | 0 | 0
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Other comprehensive income (loss) | 0 |  | 0 | 0 | (1)
Ending balance | 5 | $ 5 | 5 | 5 | 5
Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Less: Amounts reclassified from AOCI to: |  |  |  |  |
Net realized investment gains (losses) | 0 |  | 0 | 0 | 0
Interest expense |  |  |  |  | 1
Income (loss) before income taxes | 0 |  | 0 | 0 | 1
Tax (provision) benefit | 0 |  | 0 | 0 | 0
Total amount reclassified from AOCI, net of tax | 0 |  | 0 | 0 | 1
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 |  | $ 0

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