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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, 2021
P&C Commercial Lines | Workers’ compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 15.10%
2nd Year 18.70%
3rd Year 12.30%
4th Year 8.20%
5th Year 5.40%
6th Year 4.00%
7th Year 2.60%
8th Year 2.10%
9th Year 1.40%
10th Year 1.30%
P&C Commercial Lines | General liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 2.90%
2nd Year 7.80%
3rd Year 14.20%
4th Year 18.20%
5th Year 16.60%
6th Year 11.20%
7th Year 6.90%
8th Year 4.50%
9th Year 3.10%
10th Year 4.80%
P&C Commercial Lines | Marine [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 25.30%
2nd Year 31.40%
3rd Year 17.50%
4th Year 8.00%
5th Year 6.60%
6th Year 3.40%
7th Year 1.90%
8th Year 3.10%
9th Year 0.00%
10th Year 0.70%
P&C Commercial Lines | Package business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 37.40%
2nd Year 21.80%
3rd Year 10.40%
4th Year 8.60%
5th Year 6.20%
6th Year 3.20%
7th Year 2.10%
8th Year 1.20%
9th Year 0.40%
10th Year 0.30%
P&C Commercial Lines | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 53.50%
2nd Year 30.60%
3rd Year 7.70%
4th Year 3.00%
5th Year 1.00%
6th Year 0.50%
7th Year 0.10%
8th Year (0.10%)
9th Year (0.10%)
10th Year 0.00%
P&C Commercial Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 15.80%
2nd Year 20.30%
3rd Year 20.60%
4th Year 17.60%
5th Year 11.40%
6th Year 4.50%
7th Year 2.70%
8th Year 0.80%
9th Year 0.50%
10th Year 0.40%
P&C Commercial Lines | Commercial automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 88.00%
2nd Year 9.70%
3rd Year (0.40%)
P&C Commercial Lines | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 5.30%
2nd Year 18.40%
3rd Year 18.70%
4th Year 14.30%
5th Year 10.80%
6th Year 7.60%
7th Year 5.90%
8th Year 1.10%
9th Year 1.60%
10th Year 0.70%
P&C Commercial Lines | Bond  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 12.20%
2nd Year 22.20%
3rd Year 10.30%
4th Year 4.60%
5th Year (0.20%)
6th Year (0.50%)
7th Year 4.40%
8th Year 1.80%
9th Year (0.20%)
10th Year (1.60%)
P&C Commercial Lines | Assumed Reinsurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 35.20%
2nd Year 36.90%
3rd Year 9.10%
4th Year 4.90%
5th Year 7.00%
6th Year 2.40%
7th Year 1.00%
8th Year 0.30%
9th Year 0.30%
10th Year 0.10%
P&C Personal Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 34.70%
2nd Year 33.30%
3rd Year 16.00%
4th Year 7.70%
5th Year 3.10%
6th Year 1.20%
7th Year 0.50%
8th Year 0.20%
9th Year 0.20%
10th Year 0.00%
P&C Personal Lines | Personal automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 95.70%
2nd Year 2.70%
3rd Year (0.10%)
P&C Personal Lines | Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 70.70%
2nd Year 23.50%
3rd Year 1.40%
4th Year 0.30%
5th Year 0.60%
6th Year 0.30%
7th Year 0.10%
8th Year 0.10%
9th Year 0.00%
10th Year 0.00%