Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 255	$ 250
Interest expense	11	10
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	221	225
Interest expense	7	7
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	34	25
Interest expense	$ 4	$ 3