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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
 9 Months Ended 28 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 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 $ 37,855        
Less: payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross 39,378   $ 39,378    
Continental Europe Operations [Member]          
Less: payments          
Disposal Group, Including Discontinued Operation, Unpaid losses and loss adjustment expenses 82   82 $ 84  
Adverse Development Cover Navigators Group [Member]          
Provision for unpaid losses and loss adjustment expense          
Prior accident year development [1]     382    
Deferred Revenue 73 $ 97      
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 29,622 28,261      
Reinsurance and other recoverables 5,931 5,421 5,931 5,725 $ 5,275
Beginning liabilities for unpaid losses and loss adjustment expenses, net 25,259 23,730 25,259 $ 23,897 $ 22,986
Provision for unpaid losses and loss adjustment expense          
Current accident year 5,968 5,992      
Prior accident year development [1] 170 (320)      
Total provision for unpaid losses and loss adjustment expenses 6,138 5,672      
Less: payments          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (1,549) (1,447)      
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (3,155) (3,338)      
Total payments (4,704) (4,785)      
Foreign currency adjustment 1 (3)      
Ending liabilities for unpaid losses and loss adjustment expenses, net 25,259 23,730 25,259    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 31,190 29,151 31,190    
Property, Liability and Casualty Insurance Product Line | Continental Europe Operations [Member]          
Less: payments          
Disposal Group, Including Discontinued Operation, Unpaid losses and loss adjustment expenses 0 (43) $ 0    
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member]          
Provision for unpaid losses and loss adjustment expense          
Deferred Revenue $ 73 $ 97