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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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 $ 45,482   45,482      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group            
Provision for unpaid losses and loss adjustment expense            
Increase (Decrease) in Deferred Revenue 24 $ 37 (56) $ 61    
Less: payments            
Amortization of Deferred Gain on Retroactive Reinsurance     56 61    
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 6,631 6,656 6,631 6,656 $ 6,753 $ 6,696
Liability for Unpaid Claims and Claims Adjustment Expense, Net 30,727 28,481 30,727 28,481 29,651 27,348
Provision for unpaid losses and loss adjustment expense            
Current accident year     5,670 5,088    
Prior accident year development [1]     (309) (171)    
Total provision for unpaid losses and loss adjustment expenses     5,361 4,917    
Less: payments            
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year     (1,175) (987)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years     (3,205) (2,849)    
Total payments     (4,380) (3,836)    
Foreign currency adjustment     39 (9)    
Ending liabilities for unpaid losses and loss adjustment expenses, net 30,727 28,481 30,727 28,481    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (6,631) (6,656) (6,631) (6,656) $ (6,753) $ (6,696)
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 37,358 $ 35,137 37,358 35,137    
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     $ (56) $ (61)