Reinsurance - Summary of the impact of funds withheld (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Effects of Reinsurance [Line Items]
Net investment income - Fortitude Re funds withheld assets	$ 2,924	$ 2,695
Net realized gains (losses) on Fortitude Re funds withheld assets:	(320)	(1,458)
Income before income tax expense (benefit)	1,016	(669)
Income tax expense (benefit)	189	(216)
Net income (loss)	827	(453)
Comprehensive income (loss)	183	2,352
Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income - Fortitude Re funds withheld assets	332	394
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income - Fortitude Re funds withheld assets	332	394
Net realized gains (losses) on Fortitude Re funds withheld assets:	(142)	(1,005)
Income before income tax expense (benefit)	190	(611)
Income tax expense (benefit)	40	(128)
Net income (loss)	150	(483)
Comprehensive income (loss)	34	(32)
Fortitude Holdings \| Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized gains (losses) on Fortitude Re funds withheld assets:	(164)	20
Fortitude Holdings \| Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized gains (losses) on Fortitude Re funds withheld assets:	22	(1,025)
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*	$ (116)	$ 451

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