Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 1,696	$ 1,201	$ 1,070
Investment expenses	(46)	(43)	(47)
Net investment income (excluding net realized capital gains or losses)	1,650	1,158	1,023
Net realized capital gains (losses)	(497)	(320)	176
Net investment income	1,153	838	1,199
Yield-related impairment loss	152	143	42
Credit-related impairment loss (reversal of loss)	(3)	13	0
Supporting experience- rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	34	35	38
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	841	702	634
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	59	51	55
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 796	$ 448	$ 381