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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 39,659      
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 41,243 $ 39,659    
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group        
Provision for unpaid losses and loss adjustment expenses        
Increase (Decrease) in Deferred Revenue 0 (91) $ (102)  
Payments        
Policyholder Benefits and Claims Incurred, Ceded 300      
Reinsurance Policy, Type [Axis]: Asbestos and Environmental        
Payments        
Policyholder Benefits and Claims Incurred, Ceded     220  
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 31,449 29,622 28,261  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 6,465 6,081 5,725 $ 5,275
Beginning liabilities for unpaid losses and loss adjustment expenses, net 25,368 23,897 22,986  
Provision for unpaid losses and loss adjustment expenses        
Current accident year 8,577 7,911 7,794  
Prior accident year development [1] 36 199 (136)  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 8,613 8,110 7,658  
Payments        
Current accident year (2,424) (2,276) (2,214)  
Prior accident years (4,678) (4,119) (4,190)  
Total payments (7,102) (6,395) (6,404)  
Foreign currency adjustment (32) 2 14  
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance 26,618 25,368 23,897 $ 22,986
Ending liabilities for unpaid losses and loss adjustment expenses, gross 33,083 31,449 29,622  
Policyholder Benefits and Claims Incurred, Ceded 1,338 1,243 1,156  
Property and Casualty Insurance Subsidiaries | Continental Europe Operations [Member]        
Payments        
Net change in reserves transferred to liabilities held for sale 0 0 (45)  
Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group        
Provision for unpaid losses and loss adjustment expenses        
Increase (Decrease) in Deferred Revenue $ (229) $ (246) $ (312)