Reserves for Future Policy Benefits and Claims Payable - Weighted Average Duration (Details)	Jun. 30, 2024	Dec. 31, 2023
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Weighted average duration (years)	6 years 10 months 24 days	7 years
Closed Block Life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted average duration (years)	7 years	7 years 2 months 12 days
Closed Block Annuity
Liability for Future Policy Benefit, Activity [Line Items]
Weighted average duration (years)	6 years 9 months 18 days	7 years