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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
Jun. 30, 2019
Jun. 30, 2018
May 23, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 33,029        
Less: payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross 36,104        
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 24,584 $ 23,775      
Reinsurance recoverables 4,232 3,957      
Beginning liabilities for unpaid losses and loss adjustment expenses, net 22,623 19,859   $ 20,352 $ 19,818
Provision for unpaid losses and loss adjustment expense          
Current accident year 3,475 3,362      
Prior accident year development 24 (79)      
Total provision for unpaid losses and loss adjustment expenses 3,499 3,283      
Less: payments          
Current accident year 848 934      
Prior accident years 2,381 2,308      
Total payments 3,229 3,242      
Ending liabilities for unpaid losses and loss adjustment expenses, net 22,623 19,859      
Reinsurance recoverables 5,125 3,772      
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 27,748 $ 23,631      
The Navigators Group, Inc. [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reinsurance Recoverables     $ 2,001 $ 0