Reinsurance - Schedule of the impact of funds withheld (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Effects of Reinsurance [Line Items]
Net investment income	$ 3,197	$ 3,189
Net realized losses - Fortitude Re funds withheld assets	(336)	(1,414)
Income (loss) before income tax expense (benefit)	97	(862)
Income tax expense (benefit)	158	(205)
Net income (loss)	(61)	(657)
Comprehensive income (loss)	(1,037)	975
Net realized gains on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income	260	331
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income	260	331
Net realized losses - Fortitude Re funds withheld assets	(7)	(592)
Income (loss) before income tax expense (benefit)	253	(261)
Income tax expense (benefit)	53	(55)
Net income (loss)	200	(206)
Comprehensive income (loss)	46	(43)
Fortitude Holdings \| Net realized gains on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	(21)	4
Fortitude Holdings \| Net realized gains on Fortitude Re funds withheld assets \| Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	14	(596)
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	$ (154)	$ 163

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