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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, 2020
P&C Commercial Lines | Workers’ compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 15.20%
2nd Year 19.10%
3rd Year 12.40%
4th Year 8.30%
5th Year 5.70%
6th Year 4.20%
7th Year 2.60%
8th Year 2.30%
9th Year 1.70%
10th Year 1.10%
P&C Commercial Lines | General liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 2.90%
2nd Year 8.20%
3rd Year 14.60%
4th Year 18.40%
5th Year 16.20%
6th Year 10.90%
7th Year 6.60%
8th Year 4.50%
9th Year 2.80%
10th Year 1.50%
P&C Commercial Lines | Marine [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 26.10%
2nd Year 32.40%
3rd Year 18.40%
4th Year 8.40%
5th Year 7.00%
6th Year 2.80%
7th Year 2.20%
8th Year 3.90%
9th Year (0.50%)
P&C Commercial Lines | Package business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 37.50%
2nd Year 21.70%
3rd Year 10.00%
4th Year 8.60%
5th Year 6.00%
6th Year 2.90%
7th Year 2.10%
8th Year 1.20%
9th Year 0.30%
10th Year 0.30%
P&C Commercial Lines | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 53.60%
2nd Year 30.90%
3rd Year 7.60%
4th Year 3.20%
5th Year 0.90%
6th Year 0.30%
7th Year 0.20%
8th Year (0.10%)
9th Year (0.10%)
P&C Commercial Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 16.20%
2nd Year 20.80%
3rd Year 20.90%
4th Year 17.70%
5th Year 11.40%
6th Year 4.90%
7th Year 2.70%
8th Year 1.10%
9th Year 0.50%
10th Year 0.20%
P&C Commercial Lines | Commercial automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 88.20%
2nd Year 10.10%
3rd Year (0.50%)
P&C Commercial Lines | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 5.40%
2nd Year 19.00%
3rd Year 18.20%
4th Year 14.50%
5th Year 10.40%
6th Year 6.30%
7th Year 3.90%
8th Year 2.00%
9th Year 0.00%
P&C Commercial Lines | Bond  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 12.70%
2nd Year 24.30%
3rd Year 11.70%
4th Year 4.90%
5th Year 2.40%
6th Year 0.10%
7th Year 5.30%
8th Year 1.20%
9th Year 0.10%
10th Year 2.10%
P&C Commercial Lines | Assumed Reinsurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 36.30%
2nd Year 38.70%
3rd Year 8.80%
4th Year 4.90%
5th Year 8.00%
6th Year 2.50%
7th Year 1.00%
8th Year 0.30%
9th Year (0.10%)
P&C Personal Lines | Automobile liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 35.50%
2nd Year 33.20%
3rd Year 15.80%
4th Year 7.60%
5th Year 3.10%
6th Year 1.10%
7th Year 0.50%
8th Year 0.10%
9th Year 0.10%
10th Year 0.10%
P&C Personal Lines | Personal automobile physical damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 96.50%
2nd Year 3.20%
3rd Year (0.70%)
P&C Personal Lines | Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1st Year 71.80%
2nd Year 22.70%
3rd Year 1.20%
4th Year 0.40%
5th Year 0.60%
6th Year 0.30%
7th Year 0.10%
8th Year 0.10%
9th Year 0.00%
10th Year 0.00%