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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 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 $ 43,881 43,881      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group          
Less: payments          
Amortization of Deferred Gain on Retroactive Reinsurance (26) (87)      
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 6,603 6,603 6,465 $ 6,696 $ 6,465
Liability for Unpaid Claims and Claims Adjustment Expense, Net 29,092 29,092 26,988 27,348 26,618
Provision for unpaid losses and loss adjustment expense          
Current accident year   7,799 7,151    
Prior accident year development [1]   (221) (82)    
Total provision for unpaid losses and loss adjustment expenses   7,578 7,069    
Less: payments          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year   (1,852) (1,829)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years   (4,078) (4,873)    
Total payments   (5,930) (6,702)    
Foreign currency adjustment   9 3    
Ending liabilities for unpaid losses and loss adjustment expenses, net 29,092 29,092 26,988    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (6,603) (6,603) (6,465) $ (6,696) $ (6,465)
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 35,695 35,695 33,453    
Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group          
Provision for unpaid losses and loss adjustment expense          
Increase (Decrease) in Deferred Revenue   $ (87) $ 0