Reinsurance - Schedule 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]
Net investment income	$ 3,270	$ 3,320	$ 9,657	$ 9,847
Net realized gains (losses) - Fortitude Re funds withheld assets	1,625	(681)	735	(4,070)
Income (loss) before income tax expense (benefit)	2,324	(42)	2,473	(1,512)
Income tax expense (benefit)	880	(179)	1,088	(324)
Net income (loss)	1,444	137	1,385	(1,188)
Comprehensive income (loss)	(3,633)	1,742	(4,407)	3,466
Net realized losses on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income	120	368	613	1,042
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income	120	368	613	1,042
Net realized gains (losses) - Fortitude Re funds withheld assets	824	(680)	476	(1,553)
Income (loss) before income tax expense (benefit)	944	(312)	1,089	(511)
Income tax expense (benefit)	199	(65)	229	(107)
Net income (loss)	745	(247)	860	(404)
Comprehensive income (loss)	53	(12)	93	(24)
Fortitude Holdings \| Net realized losses on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized gains (losses) - Fortitude Re funds withheld assets	(208)	(10)	(254)	(36)
Fortitude Holdings \| Net realized losses on Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized gains (losses) - Fortitude Re funds withheld assets	1,032	(670)	730	(1,517)
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	$ (692)	$ 235	$ (767)	$ 380

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