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Card Member Receivables and Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts Receivable [Abstract]        
Card Member receivables $ 21,876 $ 18,218    
Less: Reserve for losses 146 110 $ 99 $ 114
Card Member receivables, net 21,730 18,108    
U.S. Consumer Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 5,601 3,518    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 14,696 13,174    
International Consumer and Network Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 1,579 $ 1,526