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Property and Casualty Insurance Reserves - Historical Claims Duration (Details)
Dec. 31, 2021
Specialty Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 39.10%
Year 2 79.30%
Year 3 91.70%
Year 4 95.80%
Year 5 97.70%
Specialty Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 91.90%
Year 2 100.80%
Year 3 100.20%
Year 4 100.10%
Year 5 100.00%
Commercial Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 27.50%
Year 2 60.70%
Year 3 79.10%
Year 4 88.70%
Year 5 93.70%
Commercial Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 87.20%
Year 2 99.90%
Year 3 99.90%
Year 4 100.00%
Year 5 100.00%
Preferred Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 31.90%
Year 2 64.60%
Year 3 81.80%
Year 4 89.90%
Year 5 94.20%
Preferred Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 96.10%
Year 2 100.70%
Year 3 99.90%
Year 4 99.90%
Year 5 100.00%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 67.00%
Year 2 94.00%
Year 3 96.80%
Year 4 98.50%
Year 5 99.10%