Reserve for Future Policy Benefits and Contractholder Funds - Schedule of revenue and interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 250	$ 275
Interest expense	10	10
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	225	253
Interest expense	7	7
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	25	22
Interest expense	$ 3	$ 3