v3.26.3
Property Casualty Loss and Loss Expenses - Consolidated Property Casualty Loss and Loss Expense Reserves (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Summary of Consolidated Property Casualty Loss and Loss Expense Reserves [Roll Forward]        
Gross loss and loss expense reserves, beginning of period     $ 11,507  
Prior accident years $ (94) $ (22) (217) $ (176)
Gross loss and loss expense reserves, end of period 12,750   12,750  
Property and Casualty Insurance        
Summary of Consolidated Property Casualty Loss and Loss Expense Reserves [Roll Forward]        
Gross loss and loss expense reserves, beginning of period 12,406 11,001 11,450 9,937
Less reinsurance recoverable 413 504 438 269
Net loss and loss expense reserves, beginning of period 11,993 10,497 11,012 9,668
Current accident year 1,689 1,486 5,287 5,114
Prior accident years (94) (22) (217) (176)
Total incurred 1,595 1,464 5,070 4,938
Current accident year 729 616 1,575 1,800
Prior accident years 587 601 2,235 2,062
Total paid 1,316 1,217 3,810 3,862
Net loss and loss expense reserves, end of period 12,272 10,744 12,272 10,744
Plus reinsurance recoverable 402 451 402 451
Gross loss and loss expense reserves, end of period $ 12,674 $ 11,195 $ 12,674 $ 11,195