Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 920	$ 932	$ 927
Interest expense	48	36	42
Accident and health
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	814	838	872
Interest expense	34	28	28
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	106	94	55
Interest expense	$ 14	$ 8	$ 14