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Property Casualty Loss and Loss Expense - Consolidated Property Casualty Loss And Loss Expense Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net incurred loss and loss expenses related to:      
Current accident year $ 5,672 $ 5,173 $ 4,875
Prior accident years (236) (215) (159)
Net paid loss and loss expenses related to:      
Gross loss and loss expense reserves, December 31 9,937    
Property and Casualty Insurance      
Liability for Claims and Claims Adjustment Expense      
Gross loss and loss expense reserves, January 1 8,975 8,336 7,229
Less reinsurance recoverable 362 405 327
Net loss and loss expense reserves, January 1 8,613 7,931 6,902
Net incurred loss and loss expenses related to:      
Current accident year 5,672 5,173 4,875
Prior accident years (236) (215) (159)
Total incurred 5,436 4,958 4,716
Net paid loss and loss expenses related to:      
Current accident year 1,951 1,875 1,592
Prior accident years 2,430 2,401 2,095
Total paid 4,381 4,276 3,687
Net loss and loss expense reserves, December 31 9,668 8,613 7,931
Plus reinsurance recoverable 269 362 405
Gross loss and loss expense reserves, December 31 $ 9,937 $ 8,975 $ 8,336