Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 264	$ 255
Interest expense	14	11
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	222	221
Interest expense	10	7
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	42	34
Interest expense	$ 4	$ 4