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Reinsurance - Summary of the Impact of Funds Withheld (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Effects of Reinsurance [Line Items] |  |  |  |
Total net investment income | $ 990 | $ 837 | $ 1,969 | $ 1,681
Net realized gains (losses) | (180) | (14) | (267) | (525)
Income from continuing operations before income tax expense | 617 | 886 | 1,675 | 1,288
Income tax expense | 142 | 45 | 403 | 110
Net income (loss) | (3,884) | 1,691 | (2,284) | 1,604
Change in unrealized depreciation of all other investments |  |  | 349 | 33
Comprehensive income (loss) | 2,810 | (47) | 3,353 | 3,779
Fortitude Re funds withheld assets |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Total net investment income | 33 | 25 | 72 | 77
Fortitude Holdings |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Total net investment income | 33 | 25 | 72 | 77
Net realized gains (losses) | 7 | 51 | (21) | (143)
Income from continuing operations before income tax expense | 40 | 76 | 51 | (66)
Income tax expense | 9 | 16 | 11 | (14)
Net income (loss) | 31 | 60 | 40 | (52)
Comprehensive income (loss) | (3) | 2 | (2) | (36)
Fortitude Holdings | Fortitude Re funds withheld assets |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Net realized gains (losses) | (1) | (7) | (20) | (61)
Fortitude Holdings | Fortitude Re funds withheld assets | Embedded derivatives |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Net realized gains (losses) | 8 | 58 | (1) | (82)
Fortitude Holdings | Other investments |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Change in unrealized depreciation of all other investments | $ (34) | $ (58) | $ (42) | $ 16

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