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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
 6 Months Ended 25 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 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 38,702   $ 38,702    
Adverse Development Cover Navigators Group [Member]          
Provision for unpaid losses and loss adjustment expense          
Prior accident year development [1]     354    
Deferred Revenue 45 $ 83      
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 5,905 5,427 5,905 $ 5,725 $ 5,275
Beginning liabilities for unpaid losses and loss adjustment expenses, net 24,677 23,257 24,677 $ 23,897 $ 22,986
Provision for unpaid losses and loss adjustment expense          
Current accident year 3,838 3,962      
Prior accident year development [1] 80 (245)      
Total provision for unpaid losses and loss adjustment expenses 3,918 3,717      
Less: payments          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (864) (778)      
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (2,222) (2,575)      
Total payments (3,086) (3,353)      
Foreign currency adjustment (7) (10)      
Ending liabilities for unpaid losses and loss adjustment expenses, net 24,677 23,257 24,677    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 30,582 28,684 $ 30,582    
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member]          
Provision for unpaid losses and loss adjustment expense          
Deferred Revenue $ 45 $ 83