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Card Member Receivables and Card Member Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounts Receivable [Abstract]        
Card Member receivables $ 25,894 $ 20,276    
Less: Reserve for losses 183 145 $ 158 $ 110
Card Member receivables, net 25,711 20,131    
Global Consumer Services Group [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 8,762 5,384    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 17,132 $ 14,892