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Unpaid losses and loss expenses Unpaid losses and loss expenses (RF Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jan. 14, 2016
Unpaid Losses and Loss Expenses [Roll Forward]        
Gross unpaid losses and loss expenses, beginning of year $ 60,540 $ 37,303    
Reinsurance Recoverable on unpaid losses, beginning of year [1] (12,708) (10,741)    
Net unpaid loss, beginning of period 47,832 26,562    
Acquisition of subsidiaries     $ 0 $ 21,402
Total, Beginning of year 47,832 47,964    
Current Year Claims and Claims Adjustment Expense 14,963 13,169    
PPD (Favorable) / Adverse [2] (781) (972)    
Total, Incurred 14,182 12,197    
Net loss and loss expenses paid, Current Year 3,937 3,865    
Net losses and loss expenses Paid, Prior Years 8,389 7,470    
Total, Paid 12,326 11,335    
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other 596 (155)    
Net unpaid Loss, end of period 50,283 48,671    
Reinsurance Recoverables on unpaid losses, end of year [1] 13,870 12,676    
Gross unpaid losses and loss expenses, end of year 64,153 61,347    
prior period development, net adjustments $ 110 $ 75    
[1] Net of provision for uncollectible reinsurance
[2] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums totaling $110 million and $75 million for the nine months ended September 30, 2017 and 2016, respectively.