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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 42,318      
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 44,610 $ 42,318    
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group        
Provision for unpaid losses and loss adjustment expenses        
Increase (Decrease) in Deferred Revenue (145) 0 $ 0  
Payments        
Amortization of Deferred Gain on Retroactive Reinsurance 145      
Property and Casualty Insurance Subsidiaries        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 34,044 33,083 31,449  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 6,753 6,696 6,465 $ 6,081
Beginning liabilities for unpaid losses and loss adjustment expenses, net 27,348 26,618 25,368  
Provision for unpaid losses and loss adjustment expenses        
Current Year Claims and Claims Adjustment Expense 10,305 9,538 8,577  
Prior accident year development [1] (120) 10 36  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 10,185 9,548 8,613  
Payments        
Current accident year (2,765) (2,716) (2,424)  
Prior accident years (5,175) (5,926) (4,678)  
Total payments (7,940) (8,642) (7,102)  
Foreign currency adjustment (25) 18 (32)  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 29,651 27,348 26,618 $ 25,368
Ending liabilities for unpaid losses and loss adjustment expenses, gross 36,404 34,044 33,083  
Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Adverse Development Covers        
Provision for unpaid losses and loss adjustment expenses        
Increase (Decrease) in Deferred Revenue $ 83 $ (194) $ (229)