Reinsurance - Reinsurance Amounts Recorded on Consolidated Statements of Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Disclosures [Abstract]
Direct insurance premiums and fee income	$ 13,782	$ 13,607	$ 13,415
Reinsurance assumed	90	98	94
Reinsurance ceded	(4,733)	(2,015)	(1,853)
Total insurance premiums and fee income	9,139	11,690	11,656
Direct insurance benefits	10,829	10,345	10,592
Reinsurance ceded	(4,691)	(1,866)	(2,089)
Total benefits	6,138	8,479	8,503
Direct market risk benefit (gain) loss	(2,309)	(3,517)	(4,011)
Reinsurance ceded	45	271	258
Total market risk benefit (gain) loss	(2,264)	(3,246)	(3,753)
Direct policyholder liability remeasurement (gain) loss	(224)	3,294	(162)
Reinsurance ceded	72	(528)	(21)
Total policyholder liability remeasurement (gain) loss	$ (152)	$ 2,766	$ (183)