Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Average Annual Percentage Payout of Incurred Claims by Age, Net of Recoverables (Details) - Group and individual accident and health	Dec. 31, 2024
Reserve for life-contingent benefits:
1 year	65.30%
2 years	32.30%
3 years	1.60%
4 years	0.60%
5 years	0.20%