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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross   $ 42,318      
Less: payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 43,323 43,323      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group          
Less: payments          
Amortization of Deferred Gain on Retroactive Reinsurance (37) (61)      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Maximum          
Less: payments          
Reinsurance, Excess Retention, Amount Reinsured, Per Policy   300      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date          
Less: payments          
Reinsurance, Amount Retained, Per Policy   1,816      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date          
Less: payments          
Reinsurance, Amount Retained, Per Policy   100      
Property, Liability and Casualty Insurance Product Line          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross   34,044 $ 33,083    
Reinsurance and other recoverables 6,656 6,656 6,448 $ 6,696 $ 6,465
Liability for Unpaid Claims and Claims Adjustment Expense, Net 28,481 28,481 26,581 27,348 26,618
Provision for unpaid losses and loss adjustment expense          
Current accident year   5,088 4,712    
Prior accident year development [1]   (171) (39)    
Total provision for unpaid losses and loss adjustment expenses   4,917 4,673    
Less: payments          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year   (987) (997)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years   (2,849) (3,731)    
Total payments   (3,836) (4,728)    
Foreign currency adjustment   (9) 18    
Ending liabilities for unpaid losses and loss adjustment expenses, net 28,481 28,481 26,581    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (6,656) (6,656) (6,448) $ (6,696) $ (6,465)
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 35,137 $ 35,137 $ 33,029