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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans segment information        
Card Member loans $ 65,265 $ 58,573    
Less: Reserve for losses 1,223 1,028 $ 1,201 $ 1,261
Card Member loans, net 64,042 57,545    
Other loans, net 1,419 1,254    
Accounts Receivable and Loans Textuals [Abstract]        
Other loans, reserves 42 20    
Variable Interest Enterprise [Member]        
Loans segment information        
Card Member loans 26,129 23,559    
U S Consumer Services [Member]        
Loans segment information        
Card Member loans 48,758 43,495    
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 26,100 23,600    
International Consumer and Network Services [Member]        
Loans segment information        
Card Member loans 6,971 7,072    
Global Commercial Services [Member]        
Loans segment information        
Card Member loans $ 9,536 $ 8,006