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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans segment information        
Card Member loans $ 73,399 $ 65,265    
Balance, December 31 1,706 1,223 $ 1,028 $ 1,201
Card Member loans, net 71,693 64,042    
Other loans, net 2,607 1,419    
Accounts Receivable and Loans Textuals [Abstract]        
Other loans, reserves 80 42    
Variable Interest Enterprise [Member]        
Loans segment information        
Card Member loans 25,695 26,129    
U S Consumer Services [Member]        
Loans segment information        
Card Member loans 53,668 48,758    
International Consumer and Network Services [Member]        
Loans segment information        
Card Member loans 8,651 6,971    
Global Commercial Services [Member]        
Loans segment information        
Card Member loans $ 11,080 $ 9,536