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Loans and Accounts Receivable (Details 1) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounts receivable segment information        
Card Member receivables $ 55,516 $ 54,047    
Less: Reserve for losses 544 521 $ 512 $ 467
Card Member receivables, net 54,972 53,526    
Other receivables, net 3,160 3,209    
Accounts Receivable and Loans Textuals [Abstract]        
Other receivables, reserves 29 31    
Variable Interest Enterprise [Member]        
Accounts receivable segment information        
Card Member receivables 7,690 8,919    
Global Consumer Services Group [Member]        
Accounts receivable segment information        
Card Member receivables 18,916 20,946    
Global Commercial Services [Member]        
Accounts receivable segment information        
Card Member receivables $ 36,600 $ 33,101