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Fair Value Measurements - Gross Components of Purchases, Sales, Issuances and Settlements (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Assets: |  |  |  |
Purchases |  |  | $ 609,000,000 | $ 713,000,000
Sales |  |  | (781,000,000) | (516,000,000)
Issuances and Settlements |  |  | (754,000,000) | (987,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (926,000,000) | (790,000,000)
Liabilities: |  |  |  |
Purchases |  |  | 0 | (481,000,000)
Sales |  |  | 0 | 7,000,000
Issuances and Settlements |  |  | 302,000,000 | 196,000,000
Purchases, Sales, Issuances and Settlements, Net |  |  | 302,000,000 | (278,000,000)
Issuances, assets | $ 0 | $ 0 |  |
Issuances, liabilities |  |  | 0 | 0
Transfers into Level 3 at end of reporting period, net gains (losses) not included in realized and unrealized gains and losses related to Level 3 for the period |  |  | (35,000,000) | 2,000,000
Transfers out Level 3 at end of reporting period, net gains (losses) included in realized and unrealized gains and losses related to Level 3 for the period |  |  | (13,000,000) | (11,000,000)
Derivative liabilities, net |  |  |  |
Liabilities: |  |  |  |
Purchases |  |  | 0 | (481,000,000)
Sales |  |  | 0 | 7,000,000
Issuances and Settlements |  |  | 377,000,000 | 576,000,000
Purchases, Sales, Issuances and Settlements, Net |  |  | 377,000,000 | 102,000,000
Fortitude Re funds withheld payable |  |  |  |
Liabilities: |  |  |  |
Purchases |  |  | 0 | 0
Sales |  |  | 0 | 0
Issuances and Settlements |  |  | (55,000,000) | (380,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (55,000,000) | (380,000,000)
Other Liabilities |  |  |  |
Liabilities: |  |  |  |
Purchases |  |  | 0 |
Sales |  |  | 0 |
Issuances and Settlements |  |  | (20,000,000) |
Purchases, Sales, Issuances and Settlements, Net |  |  | (20,000,000) | 0
Bonds available for sale |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 584,000,000 | 542,000,000
Sales |  |  | (778,000,000) | (504,000,000)
Issuances and Settlements |  |  | (588,000,000) | (923,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (782,000,000) | (885,000,000)
Bonds available for sale | Obligations of states, municipalities and political subdivisions |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 1,000,000 | 1,000,000
Sales |  |  | 0 | (15,000,000)
Issuances and Settlements |  |  | (1,000,000) | (2,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | 0 | (16,000,000)
Bonds available for sale | Non-U.S. governments |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 4,000,000 | 0
Sales |  |  | 0 | 0
Issuances and Settlements |  |  | (4,000,000) | (5,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | 0 | (5,000,000)
Bonds available for sale | Corporate debt |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 43,000,000 | 21,000,000
Sales |  |  | (29,000,000) | (4,000,000)
Issuances and Settlements |  |  | (85,000,000) | (554,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (71,000,000) | (537,000,000)
Bonds available for sale | RMBS |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 89,000,000 | 228,000,000
Sales |  |  | (53,000,000) | (25,000,000)
Issuances and Settlements |  |  | (274,000,000) | (345,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (238,000,000) | (142,000,000)
Bonds available for sale | CMBS |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 0 | 1,000,000
Sales |  |  | (15,000,000) | (23,000,000)
Issuances and Settlements |  |  | (17,000,000) | 16,000,000
Purchases, Sales, Issuances and Settlements, Net |  |  | (32,000,000) | (6,000,000)
Bonds available for sale | CLO/ABS |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 447,000,000 | 291,000,000
Sales |  |  | (681,000,000) | (437,000,000)
Issuances and Settlements |  |  | (207,000,000) | (33,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (441,000,000) | (179,000,000)
Other bond securities |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 16,000,000 | 34,000,000
Sales |  |  | (1,000,000) | (10,000,000)
Issuances and Settlements |  |  | (14,000,000) | (32,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | 1,000,000 | (8,000,000)
Other bond securities | Corporate debt |  |  |  |
Assets: |  |  |  |
Purchases |  |  |  | 20,000,000
Sales |  |  |  | 0
Issuances and Settlements |  |  |  | 24,000,000
Purchases, Sales, Issuances and Settlements, Net |  |  | 0 | 44,000,000
Other bond securities | RMBS |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 3,000,000 | 0
Sales |  |  | (1,000,000) | 0
Issuances and Settlements |  |  | (5,000,000) | (18,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (3,000,000) | (18,000,000)
Other bond securities | CLO/ABS |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 13,000,000 | 14,000,000
Sales |  |  | 0 | (10,000,000)
Issuances and Settlements |  |  | (9,000,000) | (38,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | 4,000,000 | (34,000,000)
Equity securities |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 6,000,000 | 6,000,000
Sales |  |  | (2,000,000) | (2,000,000)
Issuances and Settlements |  |  | 0 | (1,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | 4,000,000 | 3,000,000
Other invested assets |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 3,000,000 | 1,000,000
Sales |  |  | 0 | 0
Issuances and Settlements |  |  | (38,000,000) | (37,000,000)
Purchases, Sales, Issuances and Settlements, Net |  |  | (35,000,000) | (36,000,000)
Other assets |  |  |  |
Assets: |  |  |  |
Purchases |  |  | 0 | 130,000,000
Sales |  |  | 0 | 0
Issuances and Settlements |  |  | (114,000,000) | 6,000,000
Purchases, Sales, Issuances and Settlements, Net |  |  | $ (114,000,000) | $ 136,000,000

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