Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Key Assumptions Used in Calculating the Reserve for Future Policy Benefits (Details)	Dec. 31, 2024	Dec. 31, 2023
Accident and health
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average duration (in years)	8 years	4 years
Interest accretion rate (discount rate at contract issuance)	5.04%	5.83%
Current discount rate (upper-medium grade fixed income yield)	5.18%	4.77%
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average duration (in years)	14 years 10 months 24 days	15 years
Interest accretion rate (discount rate at contract issuance)	5.35%	5.41%
Current discount rate (upper-medium grade fixed income yield)	5.36%	4.97%