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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 20, 2023
May 23, 2019
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2017
Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]              
Unpaid losses and loss adjustment expenses     $ 44,610 $ 42,318      
Reinsurance Recoverables, Gross     7,215 7,207      
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance premium   $ 91          
Adverse development from comprehensive annual review     300        
Deferred Revenue     64 209      
Reinsurance Recoverables, Gross     91        
Change in Deferred Gain on Retroactive Reinsurance     145 0 $ 0    
Insurance Recoveries       0 0    
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Amount Retained, Per Policy     100        
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Amount Retained, Per Policy     1,816        
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy     0        
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy     300        
Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Change in Deferred Gain on Retroactive Reinsurance     62 $ 194 $ 229    
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance premium           $ 650 $ 650
Reinsurance, Amount Retained, Per Policy           $ 1,700  
Adverse development from comprehensive annual review     1,500        
Deferred Revenue     850        
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy     0        
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Maximum              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy     1,500        
General Liability [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Adverse development from comprehensive annual review     105        
General Liability [Member] | Abuse Claims [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Unpaid losses and loss adjustment expenses     $ 787        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years $ 787