Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 677	$ 701
Interest expense	37	36
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	600	629
Interest expense	27	26
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	77	72
Interest expense	$ 10	$ 10