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Loss and Loss Adjustment Expense Reserves Activity in Loss and Loss Adjustment Expense Reserves (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at January 1 $ 39,057 $ 34,389    
Less reinsurance recoverables on unpaid losses 3,813 4,546 $ 4,487 $ 4,789
Net balance at January 1 34,570 29,600    
Incurred related to:        
Current year 40,922 36,276    
Prior years (1,068) (199)    
Total incurred 39,854 36,077    
Paid related to:        
Current year 21,904 19,669    
Prior years 14,228 12,492    
Total paid 36,132 32,161    
Net balance at September 30 38,292 33,516    
Plus reinsurance recoverables on unpaid losses 3,813 4,546    
Balance at September 30 $ 42,105 $ 38,062