Reinsurance - Schedule 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]
Net investment income:	$ 3,190	$ 3,338	$ 6,387	$ 6,527
Net realized losses - Fortitude Re funds withheld assets	(554)	(1,975)	(890)	(3,389)
Income (loss) before income tax expense (benefit)	52	(608)	149	(1,470)
Income tax expense (benefit)	50	60	208	(145)
Net income (loss)	2	(668)	(59)	(1,325)
Comprehensive income (loss)	263	749	(774)	1,724
Net realized gains (losses) on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income:	233	343	493	674
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income:	233	343	493	674
Net realized losses - Fortitude Re funds withheld assets	(341)	(281)	(348)	(873)
Income (loss) before income tax expense (benefit)	(108)	62	145	(199)
Income tax expense (benefit)	(23)	13	30	(42)
Net income (loss)	(85)	49	115	(157)
Comprehensive income (loss)	(6)	31	40	(12)
Fortitude Holdings \| Net realized gains (losses) on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	(25)	(30)	(46)	(26)
Fortitude Holdings \| Net realized gains (losses) on Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	(316)	(251)	(302)	(847)
Fortitude Holdings \| Other investments
Effects of Reinsurance [Line Items]
Change in unrealized appreciation (depreciation) of the invested assets supporting the Fortitude Re modco arrangement classified as available-for-sale	$ 79	$ (18)	$ (75)	$ 145

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