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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Loans segment information        
Card Member loans, gross $ 63,568 $ 65,265    
Less: Reserve for losses 1,248 1,223 $ 1,012 $ 1,028
Card Member loans, net 62,320 64,042    
Other loans, net 1,635 1,419    
Accounts Receivable and Loans Textuals [Abstract]        
Other loans, reserves 51 42    
Variable Interest Enterprise [Member]        
Loans segment information        
Card Member loans, gross 24,438 26,129    
U S Consumer Services [Member]        
Loans segment information        
Card Member loans, gross 46,714 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 24,400 26,100    
International Consumer and Network Services [Member]        
Loans segment information        
Card Member loans, gross 6,814 6,971    
Global Commercial Services [Member]        
Loans segment information        
Card Member loans, gross $ 10,040 $ 9,536