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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 28,317            
Less: payments              
Ending liabilities for unpaid losses and loss adjustment expenses, gross 32,287 $ 28,317          
Reinsurance recoverables, net       $ 4,061 $ 3,659    
Property and Casualty Insurance Products              
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 22,545 22,568 $ 22,579        
Reinsurance and other recoverables 3,488 3,625 3,814        
Beginning liabilities for unpaid losses and loss adjustment expenses, net 19,818 19,057 18,943 19,818 19,057 $ 18,943 $ 18,765
Add: Acquisitions 0 122 0        
Provision for unpaid losses and loss adjustment expenses              
Current accident year 7,381 6,990 6,647        
Prior accident year development (41) 457 250        
Total provision for unpaid losses and loss adjustment expenses 7,340 7,447 6,897        
Less: payments              
Current accident year 2,751 2,749 2,653        
Prior accident years 3,828 4,219 4,066        
Total payments 6,579 6,968 6,719        
Less: net reserves transferred to liabilities held for sale 0 487 0        
Ending liabilities for unpaid losses and loss adjustment expenses, net 19,818 19,057 18,943        
Reinsurance and other recoverables 3,957 3,488 3,625        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 23,775 22,545 $ 22,568        
Operating Segments | Property and Casualty Insurance Products              
Less: payments              
Reinsurance recoverables, net       3,476 3,085    
Commercial Lines | Operating Segments              
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 17,950            
Less: payments              
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 18,893 $ 17,950          
Commercial Lines | Operating Segments | Property and Casualty Insurance Products              
Less: payments              
Liability for unpaid losses and loss adjustment expense, held for sale       688 712 $ 743  
Reinsurance recoverables, net       $ 688 $ 712