Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net Investment Income [Line Items]
Total investment income	$ 1,143	$ 1,032
Investment expenses	38	53
Net investment income	1,105	979
Change in fair value of equity method investment	217	88
Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	1,103	993
Investment expenses	38	53
Net investment income	1,065	940
Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	40	39
Investment expenses	0	0
Net investment income	40	39
Corebridge Financial Inc
Net Investment Income [Line Items]
Dividend income	31
Change in fair value of equity method investment	209
Available for sale fixed maturity securities, including short-term investments
Net Investment Income [Line Items]
Total investment income	812	787
Available for sale fixed maturity securities, including short-term investments | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	790	765
Available for sale fixed maturity securities, including short-term investments | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	22	22
Other fixed maturity securities
Net Investment Income [Line Items]
Total investment income	11	2
Other fixed maturity securities | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	0	(5)
Other fixed maturity securities | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	11	7
Equity securities
Net Investment Income [Line Items]
Total investment income	9	88
Equity securities | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	9	88
Equity securities | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	0	0
Interest on mortgage and other loans
Net Investment Income [Line Items]
Total investment income	51	77
Interest on mortgage and other loans | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	44	68
Interest on mortgage and other loans | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	7	9
Alternative investments
Net Investment Income [Line Items]
Total investment income	43	54
Alternative investments | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	43	55
Alternative investments | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	0	(1)
Other investments
Net Investment Income [Line Items]
Total investment income	217	24
Other investments | Excluding Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	217	22
Other investments | Fortitude Re Funds Withheld Assets
Net Investment Income [Line Items]
Total investment income	$ 0	$ 2