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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
Sep. 30, 2018
Sep. 30, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 32,287  
Less: payments    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 32,297  
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 23,775 $ 22,545
Reinsurance recoverables 3,957 3,488
Beginning liabilities for unpaid losses and loss adjustment expenses, net 19,818 19,057
Provision for unpaid losses and loss adjustment expense    
Current accident year 5,151 5,587
Prior accident year development (139) 1
Total provision for unpaid losses and loss adjustment expenses 5,012 5,588
Less: payments    
Current accident year 1,647 1,770
Prior accident years 3,166 3,143
Total payments 4,813 4,913
Ending liabilities for unpaid losses and loss adjustment expenses, net 20,017 19,732
Reinsurance recoverables 3,780 3,508
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 23,797 $ 23,240