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Other Insurance Liabilities and Separate Accounts - Weighted-average Interest Rates and Durations (Details)
Dec. 31, 2023
Dec. 31, 2022
Large Case Pensions    
Liability for Future Policy Benefit, Activity [Line Items]    
Interest accretion rate 4.20% 4.20%
Current discount rate 4.93% 5.24%
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 5.08% 5.39%
Weighted-average duration of long-duration insurance liabilities 12 years 1 month 6 days 12 years 7 months 6 days