Reinsurance - Reinsurance Amounts Recorded on Consolidated Statements of Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Disclosures [Abstract]
Direct insurance premiums and fee income	$ 14,052	$ 13,661	$ 13,479
Reinsurance assumed	90	91	102
Reinsurance ceded	(7,790)	(5,168)	(2,374)
Total insurance premiums and fee income	6,352	8,584	11,207
Direct insurance benefits	10,845	10,178	10,266
Reinsurance ceded	(8,745)	(5,150)	(2,063)
Total benefits	2,100	5,028	8,203
Direct market risk benefit (gain) loss	(2,819)	(2,309)	(3,517)
Reinsurance ceded	1,881	1,174	3,814
Total market risk benefit (gain) loss	(938)	(1,135)	296
Direct policyholder liability remeasurement (gain) loss	35	(234)	3,284
Reinsurance ceded	(55)	67	(839)
Total policyholder liability remeasurement (gain) loss	$ (20)	$ (167)	$ 2,445