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Reserve for Unpaid Losses and Loss Adjustment Expenses - Average Annual Payout of Incurred Claims by Age, Group (Details) - Group Benefits
Dec. 31, 2023
Group life and accident, excluding premium waiver  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 75.10%
2nd Year 22.80%
3rd Year 1.00%
Group long-term disability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 7.50%
2nd Year 26.50%
3rd Year 15.90%
4th Year 8.20%
5th Year 6.30%
6th Year 5.40%
7th Year 4.60%
8th Year 3.90%
9th Year 3.30%
10th Year 3.00%