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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Loans segment information        
Card Member loans $ 77,603 $ 73,399    
Less: Reserve for losses 1,937 1,706 $ 1,502 $ 1,223
Card Member loans, net 75,666 71,693    
Other loans, net 3,431 2,607    
Accounts Receivable and Loans Textuals [Abstract]        
Card Member loans, gross loans of a consolidated variable interest entity 77,603 73,399    
Other loans, reserves 111 80    
Variable Interest Enterprise [Member]        
Loans segment information        
Card Member loans 23,739 25,695    
Accounts Receivable and Loans Textuals [Abstract]        
Card Member loans, gross loans of a consolidated variable interest entity 23,739 25,695    
Global Consumer Services Group [Member]        
Loans segment information        
Card Member loans 65,400 62,319    
Accounts Receivable and Loans Textuals [Abstract]        
Card Member loans, gross loans of a consolidated variable interest entity 65,400 62,319    
Global Commercial Services [Member]        
Loans segment information        
Card Member loans 12,203 11,080    
Accounts Receivable and Loans Textuals [Abstract]        
Card Member loans, gross loans of a consolidated variable interest entity $ 12,203 $ 11,080