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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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 32,973      
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 20,402 19,777 $ 20,352 $ 19,818
Provision for unpaid losses and loss adjustment expense        
Current accident year 1,641 1,640    
Prior accident year development (11) (32)    
Total provision for unpaid losses and loss adjustment expenses 1,630 1,608    
Less: payments        
Current accident year 271 327    
Prior accident years 1,309 1,322    
Total payments 1,580 1,649    
Ending liabilities for unpaid losses and loss adjustment expenses, net 20,402 19,777    
Reinsurance recoverables 4,209 3,938    
Ending liabilities for unpaid losses and loss adjustment expenses, gross $ 24,611 $ 23,715