v3.26.1
Reinsurance - Summary of the Impact of Funds Withheld (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Effects of Reinsurance [Line Items]        
Total net investment income $ 1,127 $ 1,466 $ 1,839 $ 2,571
Net realized losses on Fortitude Re funds withheld assets (265) (258) (400) (361)
Loss before income tax benefit 1,264 1,544 2,251 2,504
Income tax benefit 316 400 540 662
Net loss 948 1,144 1,711 1,842
Change in unrealized appreciation on available for sale securities     (112) 805
Comprehensive income (loss) 1,057 2,060 1,092 3,394
Fortitude Re funds withheld assets        
Effects of Reinsurance [Line Items]        
Total net investment income 36 39 59 79
Fortitude Holdings        
Effects of Reinsurance [Line Items]        
Total net investment income 36 39 59 79
Net realized losses on Fortitude Re funds withheld assets (57) (66) (60) (109)
Loss before income tax benefit (21) (27) (1) (30)
Income tax benefit (4) (5) 0 (6)
Net loss (17) (22) (1) (24)
Comprehensive income (loss) (4) 3 (1) (1)
Fortitude Holdings | Fortitude Re funds withheld assets        
Effects of Reinsurance [Line Items]        
Net realized losses on Fortitude Re funds withheld assets (6) (52) (19) (54)
Fortitude Holdings | Fortitude Re funds withheld assets | Embedded derivatives        
Effects of Reinsurance [Line Items]        
Net realized losses on Fortitude Re funds withheld assets (51) (14) (41) (55)
Fortitude Holdings | Other investments        
Effects of Reinsurance [Line Items]        
Change in unrealized appreciation on available for sale securities $ 13 $ 25 $ 0 $ 23