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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
Mar. 31, 2025
Mar. 31, 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 (91) $ (100)
Gross loss and loss expense reserves, end of period 10,780  
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 9,937 8,975
Less reinsurance recoverable 269 362
Net loss and loss expense reserves, beginning of period 9,668 8,613
Current accident year 1,978 1,370
Prior accident years (91) (100)
Total incurred 1,887 1,270
Current accident year 593 205
Prior accident years 806 832
Total paid 1,399 1,037
Net loss and loss expense reserves, end of period 10,156 8,846
Plus reinsurance recoverable 551 332
Gross loss and loss expense reserves, end of period $ 10,707 $ 9,178