Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Revenue and Interest Recognized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 964	$ 920	$ 932
Interest expense	44	48	36
Accident and health
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	820	814	838
Interest expense	28	34	28
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	144	106	94
Interest expense	$ 16	$ 14	$ 8