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Loss and Loss Adjustment Expense Reserves (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years $ 1,068 $ 199
Personal Lines | Personal auto business    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years 910 $ 375
Personal Lines | Personal auto business | Agency    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Percent of prior year claims and claims adjustment expense   0.60
Personal Lines | Personal property    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years 75 $ (75)
Commercial Lines    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years 80 (100)
Short-Duration Insurance Contract, Accident Year 2024    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years 660  
Short-Duration Insurance Contract, Accident Year 2023    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years $ 190 160
Short-Duration Insurance Contract, Accident Year 2022    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years   $ 5