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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, 2022
P&C Commercial Lines | Workers’ compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 15.10%
2nd Year 18.40%
3rd Year 12.00%
4th Year 8.00%
5th Year 5.40%
6th Year 3.80%
7th Year 2.60%
8th Year 2.00%
9th Year 1.30%
10th Year 1.20%
P&C Commercial Lines | General liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 2.80%
2nd Year 7.50%
3rd Year 13.90%
4th Year 18.00%
5th Year 16.60%
6th Year 11.90%
7th Year 7.90%
8th Year 4.20%
9th Year 3.40%
10th Year 2.80%
P&C Commercial Lines | Marine [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 24.20%
2nd Year 31.30%
3rd Year 17.50%
4th Year 7.70%
5th Year 6.40%
6th Year 4.10%
7th Year 2.00%
8th Year 2.70%
9th Year 1.00%
10th Year 0.60%
P&C Commercial Lines | Package business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 36.80%
2nd Year 21.10%
3rd Year 10.30%
4th Year 9.20%
5th Year 6.40%
6th Year 3.40%
7th Year 2.40%
8th Year 1.90%
9th Year 0.50%
10th Year 0.70%
P&C Commercial Lines | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 52.40%
2nd Year 30.10%
3rd Year 7.40%
4th Year 3.40%
5th Year 1.10%
6th Year 0.80%
7th Year 0.10%
8th Year 0.00%
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 15.40%
2nd Year 19.70%
3rd Year 19.90%
4th Year 17.20%
5th Year 11.80%
6th Year 5.80%
7th Year 3.40%
8th Year 0.90%
9th Year 0.80%
10th Year 0.50%
P&C Commercial Lines | Commercial automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 85.30%
2nd Year 12.70%
3rd Year (0.40%)
P&C Commercial Lines | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 5.00%
2nd Year 17.40%
3rd Year 18.60%
4th Year 13.90%
5th Year 11.70%
6th Year 8.70%
7th Year 8.10%
8th Year 2.70%
9th Year 3.20%
10th Year 0.30%
P&C Commercial Lines | Bond  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 11.30%
2nd Year 22.60%
3rd Year 12.30%
4th Year 6.10%
5th Year 0.40%
6th Year (0.40%)
7th Year (0.10%)
8th Year (2.90%)
9th Year 4.10%
10th Year (1.10%)
P&C Commercial Lines | Assumed Reinsurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 34.10%
2nd Year 36.00%
3rd Year 9.90%
4th Year 5.10%
5th Year 3.50%
6th Year 1.60%
7th Year 1.40%
8th Year 0.30%
9th Year 0.40%
10th Year 0.20%
P&C Personal Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 34.10%
2nd Year 33.50%
3rd Year 16.20%
4th Year 7.80%
5th Year 3.30%
6th Year 1.30%
7th Year 0.60%
8th Year 0.20%
9th Year 0.30%
10th Year 0.10%
P&C Personal Lines | Personal automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 94.90%
2nd Year 4.00%
3rd Year (0.10%)
P&C Personal Lines | Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 69.30%
2nd Year 24.40%
3rd Year 1.60%
4th Year 0.50%
5th Year 0.70%
6th Year 0.20%
7th Year 0.10%
8th Year 0.00%
9th Year 0.10%
10th Year 0.00%