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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Summary of Consolidated Property Casualty Loss and Loss Expense Reserves [Roll Forward]        
Gross loss and loss expense reserves, beginning of period     $ 10,003  
Prior accident years $ (22) $ (71) (176) $ (211)
Gross loss and loss expense reserves, end of period 11,260   11,260  
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 11,001 9,494 9,937 8,975
Less reinsurance recoverable 504 303 269 362
Net loss and loss expense reserves, beginning of period 10,497 9,191 9,668 8,613
Current accident year 1,486 1,570 5,114 4,392
Prior accident years (22) (71) (176) (211)
Total incurred 1,464 1,499 4,938 4,181
Current accident year 616 574 1,800 1,262
Prior accident years 601 540 2,062 1,956
Total paid 1,217 1,114 3,862 3,218
Net loss and loss expense reserves, end of period 10,744 9,576 10,744 9,576
Plus reinsurance recoverable 451 290 451 290
Gross loss and loss expense reserves, end of period $ 11,195 $ 9,866 $ 11,195 $ 9,866