Other Insurance Liabilities and Separate Accounts - Weighted-average Interest Rates and Durations (Details)	Dec. 31, 2025	Dec. 31, 2024
Large Case Pensions
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	4.21%	4.20%
Current discount rate	5.13%	5.46%
Weighted-average duration of long-duration insurance liabilities	7 years 2 months 12 days	7 years 3 months 18 days
Long-Term Care
Liability for Future Policy Benefit, Activity [Line Items]
Interest accretion rate	5.11%	5.11%
Current discount rate	5.51%	5.70%
Weighted-average duration of long-duration insurance liabilities	11 years 2 months 12 days	11 years 8 months 12 days