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	$ 14,160	$ 13,782	$ 13,607
Reinsurance assumed	86	90	98
Reinsurance ceded	(2,419)	(4,733)	(2,015)
Total insurance premiums and fee income	11,827	9,139	11,690
Direct insurance benefits	10,857	10,829	10,345
Reinsurance ceded	(2,939)	(4,691)	(1,866)
Total benefits	7,918	6,138	8,479
Direct market risk benefit (gain) loss	(2,818)	(2,309)	(3,517)
Reinsurance ceded	141	45	271
Total market risk benefit (gain) loss	(2,677)	(2,264)	(3,246)
Direct policyholder liability remeasurement (gain) loss	86	(224)	3,294
Reinsurance ceded	(276)	72	(528)
Total policyholder liability remeasurement (gain) loss	$ (190)	$ (152)	$ 2,766