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Card Member Receivables and Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts Receivable [Abstract]        
Card Member receivables $ 19,866 $ 18,218    
Less: Reserve for losses 128 110 $ 118 $ 114
Card Member receivables, net 19,738 18,108    
U.S. Consumer Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 3,968 3,518    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 14,341 13,174    
International Consumer and Network Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 1,557 $ 1,526