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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]            
Beginning liabilities for unpaid losses and loss adjustment expenses, gross     $ 44,610      
Less: payments            
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 45,820   45,820      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group            
Provision for unpaid losses and loss adjustment expense            
Increase (Decrease) in Deferred Revenue 8 $ 26 (64) $ 87    
Less: payments            
Amortization of Deferred Gain on Retroactive Reinsurance     64 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     36,404 34,044    
Reinsurance and other recoverables 6,627 6,603 6,627 6,603 $ 6,753 $ 6,696
Liability for Unpaid Claims and Claims Adjustment Expense, Net 31,112 29,092 31,112 29,092 29,651 27,348
Provision for unpaid losses and loss adjustment expense            
Current accident year     8,401 7,799    
Prior accident year development [1]     (412) (221)    
Total provision for unpaid losses and loss adjustment expenses     7,989 7,578    
Less: payments            
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year     (2,038) (1,852)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years     (4,586) (4,078)    
Total payments     (6,624) (5,930)    
Foreign currency adjustment     32 (9)    
Ending liabilities for unpaid losses and loss adjustment expenses, net 31,112 29,092 31,112 29,092    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (6,627) (6,603) (6,627) (6,603) $ (6,753) $ (6,696)
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 37,739 $ 35,695 37,739 35,695    
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     $ (64) $ (87)