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Card Member Receivables and Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts Receivable [Abstract]        
Card Member receivables $ 22,792 $ 20,276    
Less: Reserve for losses 157 145 $ 146 $ 110
Card Member receivables, net 22,635 20,131    
Global Consumer Services Group [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 6,428 5,384    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 16,364 $ 14,892