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	$ 13,661	$ 13,479	$ 13,277
Reinsurance assumed	91	102	97
Reinsurance ceded	(5,168)	(2,374)	(2,249)
Total insurance premiums and fee income	8,584	11,207	11,125
Direct insurance benefits	10,178	10,266	10,491
Reinsurance ceded	(5,150)	(2,063)	(2,464)
Total benefits	5,028	8,203	8,027
Direct market risk benefit (gain) loss	(2,309)	(3,517)	(4,011)
Reinsurance ceded	1,174	3,814	2,457
Total market risk benefit (gain) loss	(1,135)	296	(1,554)
Direct policyholder liability remeasurement (gain) loss	(234)	3,284	(164)
Reinsurance ceded	67	(839)	45
Total policyholder liability remeasurement (gain) loss	$ (167)	$ 2,445	$ (119)