Reinsurance - Summary of the Impact of Funds Withheld (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Effects of Reinsurance [Line Items]
Total net investment income	$ 1,100	$ 772	$ 2,939	$ 3,343
Net realized gains (losses) on Fortitude Re funds withheld assets	(110)	(490)	(510)	(851)
Income (loss) before income tax expense (benefit)	1,119	714	3,370	3,218
Income tax expense (benefit)	270	190	810	852
Net income (loss)	849	524	2,560	2,366
Change in unrealized appreciation (depreciation) on available for sale securities			(205)	537
Comprehensive loss	(999)	1,026	93	4,420
Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Total net investment income	16	29	75	108
Fortitude Holdings
Effects of Reinsurance [Line Items]
Total net investment income	16	29	75	108
Net realized gains (losses) on Fortitude Re funds withheld assets	57	(59)	(3)	(168)
Income (loss) before income tax expense (benefit)	73	(30)	72	(60)
Income tax expense (benefit)	15	(7)	15	(13)
Net income (loss)	58	(23)	57	(47)
Comprehensive loss	0	0	(1)	(1)
Fortitude Holdings \| Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized gains (losses) on Fortitude Re funds withheld assets	(28)	(5)	(47)	(59)
Fortitude Holdings \| Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized gains (losses) on Fortitude Re funds withheld assets	85	(54)	44	(109)
Fortitude Holdings \| Other investments
Effects of Reinsurance [Line Items]
Change in unrealized appreciation (depreciation) on available for sale securities	$ (58)	$ 23	$ (58)	$ 46

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