Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Ratio of Actual to Expected Lapses used in the Determination of the Reserve for Future Policy Benefits (Details)	Dec. 31, 2023	Dec. 31, 2022
Accident and health | Morbidity
Liability for Future Policy Benefit, Activity [Line Items]
Actual to expected experience	92.00%	94.00%
Accident and health | Lapses
Liability for Future Policy Benefit, Activity [Line Items]
Actual to expected experience	110.00%	112.00%
Traditional life | Mortality
Liability for Future Policy Benefit, Activity [Line Items]
Actual to expected experience	95.00%	238.00%
Traditional life | Lapses
Liability for Future Policy Benefit, Activity [Line Items]
Actual to expected experience	78.00%	61.00%