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Card Member Receivables and Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Abstract]        
Card Member receivables $ 20,276 $ 18,218    
Less: Reserve for losses 145 110 $ 114 $ 94
Card Member receivables, net 20,131 18,108    
U.S. Consumer Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 3,557 3,518    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 14,892 13,174    
International Consumer and Network Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 1,827 $ 1,526