Reinsurance - Summary of the impact of funds withheld (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Effects of Reinsurance [Line Items]
Total net investment income	$ 2,668	$ 3,715	$ 8,509	$ 11,047
Total net realized gains	3,175	660	10,986	1,984
Income from continuing operations before income tax expense	3,847	2,176	14,003	7,051
Income tax expense	806	439	2,913	1,234
Net income	3,041	1,737	11,089	5,817
Change in unrealized depreciation of all other investments			2,738	1,295
Comprehensive income (loss)	(5,932)	135	(24,299)	912
Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Total net investment income	155	495	634	1,488
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net underwriting income	0	0	0	0
Total net investment income	155	495	634	1,488
Total net realized gains	1,671	(19)	7,539	653
Income from continuing operations before income tax expense	1,826	476	8,173	2,141
Income tax expense	383	99	1,716	449
Net income	1,443	377	6,457	1,692
Comprehensive income (loss)	126	17	346	47
Fortitude Holdings | Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Total net realized gains	(86)	190	(312)	536
Fortitude Holdings | Fortitude Re funds withheld assets | Embedded derivatives
Effects of Reinsurance [Line Items]
Total net realized gains	1,757	(209)	7,851	117
Fortitude Holdings | Other investments
Effects of Reinsurance [Line Items]
Change in unrealized depreciation of all other investments	$ (1,317)	$ (360)	$ (6,111)	$ (1,645)