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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
Mar. 31, 2025
Mar. 31, 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 45,266      
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group        
Provision for unpaid losses and loss adjustment expense        
Increase (Decrease) in Deferred Revenue 32 $ (24)    
Less: payments        
Amortization of Deferred Gain on Retroactive Reinsurance 32 24    
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 6,764 6,705 $ 6,753 $ 6,696
Liability for Unpaid Claims and Claims Adjustment Expense, Net 30,341 27,832 29,651 27,348
Provision for unpaid losses and loss adjustment expense        
Current accident year 2,921 2,461    
Prior accident year development [1] (122) (56)    
Total provision for unpaid losses and loss adjustment expenses 2,799 2,405    
Less: payments        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (458) (349)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (1,696) (1,591)    
Total payments (2,154) (1,940)    
Foreign currency adjustment 13 (5)    
Ending liabilities for unpaid losses and loss adjustment expenses, net 30,341 27,832    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (6,764) (6,705) $ (6,753) $ (6,696)
Ending liabilities for unpaid losses and loss adjustment expenses, gross 37,105 34,537    
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 $ (32) $ (24)