Other Insurance Liabilities and Separate Accounts - Weighted-average Interest Rates and Durations (Details)	Jun. 30, 2024	Jun. 30, 2023
Large Case Pensions
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	4.20%	4.20%
Current discount rate	5.42%	5.17%
Weighted-average duration of long-duration insurance liabilities	7 years 3 months 18 days	7 years 4 months 24 days
Long-Term Care
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	5.11%	5.11%
Current discount rate	5.57%	5.24%
Weighted-average duration of long-duration insurance liabilities	11 years 10 months 24 days	12 years 4 months 24 days