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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]      
Liability for Claims and Claims Adjustment Expense $ 45,266   $ 44,610
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Increase (Decrease) in Deferred Revenue 32 $ (24)  
Change in Deferred Gain on Retroactive Reinsurance 32   $ 64
Maximum | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 300    
General Liability [Member] | Abuse Claims      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Liability for Claims and Claims Adjustment Expense $ 787