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Property Casualty Loss and Loss Expenses (Tables)
9 Months Ended
Sep. 30, 2024
Premiums Written, Net [Abstract]  
Consolidated Property Casualty Loss And Loss Expense Reserves
This table summarizes activity for our consolidated property casualty loss and loss expense reserves:
(Dollars in millions)Three months ended September 30,Nine months ended September 30,
2024202320242023
Gross loss and loss expense reserves, beginning of period$9,494 $8,807 $8,975 $8,336 
Less reinsurance recoverable303 424 362 405 
Net loss and loss expense reserves, beginning of period9,191 8,383 8,613 7,931 
Net incurred loss and loss expenses related to:    
Current accident year1,570 1,314 4,392 4,053 
Prior accident years(71)(53)(211)(213)
Total incurred1,499 1,261 4,181 3,840 
Net paid loss and loss expenses related to:    
Current accident year574 597 1,262 1,286 
Prior accident years540 461 1,956 1,899 
Total paid1,114 1,058 3,218 3,185 
Net loss and loss expense reserves, end of period9,576 8,586 9,576 8,586 
Plus reinsurance recoverable290 419 290 419 
Gross loss and loss expense reserves, end of period$9,866 $9,005 $9,866 $9,005