Reinsurance - Effect of Reinsurance - Traditional Long Duration Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Traditional and universal life insurance policies
Life Insurance policies in force
Insurance policies in force, gross	$ 198,900	$ 198,600
Insurance policies in force, reinsured	146,200	145,100
Traditional long-duration contracts
Effect of reinsurance on premiums
Direct premiums	530	490	$ 565
Reinsurance ceded	(224)	(1,361)	(224)
Net premiums	$ 306	$ (871)	$ 341