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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Loans segment information        
Card Member loans, gross $ 67,878 $ 65,265    
Less: Reserve for losses 1,502 1,223 $ 1,114 $ 1,028
Card Member loans, net 66,376 64,042    
Other loans, less reserves 2,268 1,419    
Accounts Receivable and Loans Textuals [Abstract]        
Other loans, reserves 64 42    
Variable Interest Enterprise [Member]        
Loans segment information        
Card Member loans, gross 24,249 26,129    
U S Consumer Services [Member]        
Loans segment information        
Card Member loans, gross 49,326 48,758    
U S Consumer Services [Member] | Variable Interest Enterprise [Member]        
Accounts Receivable and Loans Textuals [Abstract]        
Gross Card Member loans available to settle the obligations of a variable interest entity 24,200 26,100    
International Consumer and Network Services [Member]        
Loans segment information        
Card Member loans, gross 7,823 6,971    
Global Commercial Services [Member]        
Loans segment information        
Card Member loans, gross $ 10,729 $ 9,536