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Property and Casualty Insurance Reserves - Historical Claims Duration (Details)
Dec. 31, 2022
Specialty Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 39.20%
Year 2 79.10%
Year 3 91.70%
Year 4 96.20%
Year 5 98.20%
Specialty Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 91.40%
Year 2 100.90%
Year 3 100.10%
Year 4 100.00%
Year 5 100.00%
Commercial Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 25.70%
Year 2 58.50%
Year 3 76.50%
Year 4 88.30%
Year 5 93.80%
Commercial Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 86.40%
Year 2 99.80%
Year 3 99.80%
Year 4 99.90%
Year 5 99.90%
Preferred Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 31.10%
Year 2 62.30%
Year 3 79.50%
Year 4 90.00%
Year 5 95.30%
Preferred Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 96.00%
Year 2 100.50%
Year 3 99.80%
Year 4 99.80%
Year 5 99.90%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 67.50%
Year 2 92.20%
Year 3 96.40%
Year 4 98.50%
Year 5 99.30%