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Reserve for Unpaid Losses and Loss Adjustment Expenses - Average Annual Payout of Incurred Claims by Age, P&C (Details)
Dec. 31, 2023
P&C Commercial Lines | Workers’ compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 14.90%
2nd Year 18.40%
3rd Year 12.00%
4th Year 8.20%
5th Year 5.60%
6th Year 3.80%
7th Year 2.80%
8th Year 2.10%
9th Year 1.60%
10th Year 1.00%
P&C Commercial Lines | General liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 2.70%
2nd Year 7.60%
3rd Year 12.70%
4th Year 16.70%
5th Year 16.60%
6th Year 12.30%
7th Year 9.00%
8th Year 5.10%
9th Year 2.70%
10th Year 3.90%
P&C Commercial Lines | Marine [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 23.10%
2nd Year 31.80%
3rd Year 18.00%
4th Year 7.20%
5th Year 6.70%
6th Year 6.00%
7th Year 2.30%
8th Year 1.50%
9th Year 0.80%
10th Year 0.40%
P&C Commercial Lines | Package business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 36.70%
2nd Year 22.30%
3rd Year 10.00%
4th Year 9.10%
5th Year 6.60%
6th Year 3.90%
7th Year 2.20%
8th Year 1.70%
9th Year 1.30%
10th Year 1.10%
P&C Commercial Lines | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 50.90%
2nd Year 32.10%
3rd Year 7.20%
4th Year 3.50%
5th Year 1.20%
6th Year 0.60%
7th Year 0.10%
8th Year 0.10%
9th Year 0.00%
10th Year 0.00%
P&C Commercial Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 14.70%
2nd Year 19.90%
3rd Year 19.60%
4th Year 16.90%
5th Year 12.30%
6th Year 6.00%
7th Year 3.80%
8th Year 1.10%
9th Year 1.00%
10th Year 0.90%
P&C Commercial Lines | Commercial automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 79.70%
2nd Year 17.10%
3rd Year (0.20%)
P&C Commercial Lines | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 5.00%
2nd Year 16.50%
3rd Year 18.10%
4th Year 13.20%
5th Year 10.70%
6th Year 9.70%
7th Year 8.50%
8th Year 3.50%
9th Year 4.20%
10th Year 3.70%
P&C Commercial Lines | Bond  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 11.70%
2nd Year 24.90%
3rd Year 9.40%
4th Year 6.80%
5th Year 0.30%
6th Year (0.40%)
7th Year (0.50%)
8th Year (5.50%)
9th Year 4.00%
10th Year 0.00%
P&C Commercial Lines | Assumed Reinsurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 30.40%
2nd Year 35.40%
3rd Year 10.80%
4th Year 5.50%
5th Year 4.60%
6th Year 1.80%
7th Year 1.30%
8th Year 1.10%
9th Year 0.50%
10th Year 0.30%
P&C Personal Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 33.20%
2nd Year 34.20%
3rd Year 16.40%
4th Year 8.00%
5th Year 3.50%
6th Year 1.40%
7th Year 0.50%
8th Year 0.30%
9th Year 0.20%
10th Year 0.10%
P&C Personal Lines | Personal automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 91.30%
2nd Year 6.50%
3rd Year 0.10%
P&C Personal Lines | Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 68.70%
2nd Year 25.70%
3rd Year 1.80%
4th Year 0.50%
5th Year 0.70%
6th Year 0.10%
7th Year 0.10%
8th Year 0.00%
9th Year 0.00%
10th Year 0.00%