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]
Net investment income - Fortitude Re funds withheld assets	$ 2,988	$ 2,714	$ 5,912	$ 5,409
Net realized losses on Fortitude Re funds withheld assets	(747)	(320)	(1,067)	(1,778)
Income (loss) before income tax expense (benefit)	456	911	1,472	242
Income tax expense (benefit)	115	160	304	(56)
Net income	341	751	1,168	298
Comprehensive income (loss)	(29)	(363)	154	1,989
Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income - Fortitude Re funds withheld assets	325	270	657	664
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income - Fortitude Re funds withheld assets	325	270	657	664
Net realized losses on Fortitude Re funds withheld assets	(57)	(8)	(199)	(1,013)
Income (loss) before income tax expense (benefit)	268	262	458	(349)
Income tax expense (benefit)	56	55	96	(73)
Net income	212	207	362	(276)
Comprehensive income (loss)	(4)	42	30	10
Fortitude Holdings \| Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized losses on Fortitude Re funds withheld assets	(93)	(130)	(257)	(110)
Fortitude Holdings \| Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized losses on Fortitude Re funds withheld assets	36	122	58	(903)
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	$ (216)	$ (165)	$ (332)	$ 286

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