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Reinsurance - Summary of the Impact of Funds Withheld (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net investment income |  |  |  |  |  |  |  |  | $ 4,255 | $ 3,446 | $ 2,370
Net realized gains (losses) |  |  |  |  |  |  |  |  | (548) | (1,078) | 827
Income (loss) from continuing operations before income tax expense (benefit) |  |  |  |  |  |  |  |  | 3,870 | 2,867 | 3,772
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,170 | 126 | 882
Net income (loss) | $ 901 | $ 457 | $ (3,884) | $ 1,600 | $ (473) | $ 2,747 | $ 1,691 | $ (87) | (926) | 3,878 | 11,273
Change in unrealized appreciation (depreciation) on available for sale securities |  |  |  |  |  |  |  |  | 571 | (1,075) | (2,123)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 5,179 | 9,818 | (21,030)
Fortitude Re funds withheld assets |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net investment income |  |  |  |  |  |  |  |  | 144 | 180 | 53
Fortitude Holdings |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net investment income |  |  |  |  |  |  |  |  | 144 | 180 | 53
Net realized gains (losses) |  |  |  |  |  |  |  |  | (114) | (344) | 1,034
Income (loss) from continuing operations before income tax expense (benefit) |  |  |  |  |  |  |  |  | 30 | (164) | 1,087
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 6 | (34) | 228
Net income (loss) |  |  |  |  |  |  |  |  | 24 | (130) | 859
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (4) | (38) | 11
Fortitude Holdings | Fortitude Re funds withheld assets |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) |  |  |  |  |  |  |  |  | (39) | (71) | (99)
Fortitude Holdings | Fortitude Re funds withheld assets | Embedded derivatives |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) |  |  |  |  |  |  |  |  | (75) | (273) | 1,133
Fortitude Holdings | Other investments |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in unrealized appreciation (depreciation) on available for sale securities |  |  |  |  |  |  |  |  | $ (28) | $ 92 | $ (848)

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