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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Average Annual Percentage Payout of Incurred Claims by Age, Net of Recoverables (Details)
Dec. 31, 2025
Auto insurance – liability coverage  
Claims Development [Line Items]  
1 year 33.80%
2 years 33.40%
3 years 15.10%
4 years 7.80%
5 years 4.10%
After 5 years 5.80%
Auto insurance - physical damage coverage  
Claims Development [Line Items]  
1 year 93.10%
2 years 7.20%
3 years (0.50%)
4 years (0.20%)
5 years 0.00%
After 5 years 0.40%
Homeowners  
Claims Development [Line Items]  
1 year 66.50%
2 years 26.30%
3 years 4.00%
4 years 1.80%
5 years 0.70%
After 5 years 0.70%