Reinsurance - Schedule of the impact of funds withheld (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effects of Reinsurance [Line Items]
Net investment income (loss)	$ 13,124	$ 12,228	$ 11,078
Net realized losses - Fortitude Re funds withheld assets	(3,958)	(1,883)	(3,572)
Income (loss) before income tax expense (benefit)	(541)	2,803	940
Income tax expense (benefit)	(151)	600	(96)
Net income (loss)	(390)	2,203	1,036
Comprehensive income (loss)	3,840	2,026	4,452
Net realized losses on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income (loss)	1,332	1,370	1,368
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net investment income (loss)	1,332	1,370	1,368
Net realized losses - Fortitude Re funds withheld assets	(1,773)	(766)	(1,958)
Income (loss) before income tax expense (benefit)	(441)	604	(590)
Income tax expense (benefit)	(93)	127	(124)
Net income (loss)	(348)	477	(466)
Comprehensive income (loss)	(52)	75	25
Fortitude Holdings \| Net realized losses on Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	(100)	(248)	(224)
Fortitude Holdings \| Net realized losses on Fortitude Re funds withheld assets \| Embedded derivative
Effects of Reinsurance [Line Items]
Net realized losses - Fortitude Re funds withheld assets	(1,673)	(518)	(1,734)
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	$ 296	$ (402)	$ 491

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