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Accounts Receivable and Loans (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Accounts receivable segment information        
Card Member receivables $ 45,117,000,000 $ 44,163,000,000    
Less: Reserve for losses 432,000,000 386,000,000 396,000,000 428,000,000
Card Member receivables, net 44,685,000,000 43,777,000,000    
Other receivables, net 2,631,000,000 3,408,000,000    
Accounts Receivable and Loans Textuals [Abstract]        
Other receivables, reserves 44,000,000 71,000,000    
Variable Interest Enterprise [Member]
       
Accounts receivable segment information        
Card Member receivables 6,253,000,000 7,329,000,000    
Non United States [Member]
       
Accounts receivable segment information        
Card Member receivables 13,500,000,000 13,800,000,000    
U S Card Services [Member]
       
Accounts receivable segment information        
Card Member receivables 21,253,000,000 21,842,000,000    
U S Card Services [Member] | Variable Interest Enterprise [Member]
       
Accounts Receivable and Loans Textuals [Abstract]        
Gross Card Member receivables available to settle the obligations of a variable interest entity 6,300,000,000 7,300,000,000    
International Card Services [Member]
       
Accounts receivable segment information        
Card Member receivables 7,273,000,000 7,771,000,000    
Global Commercial Services [Member]
       
Accounts receivable segment information        
Card Member receivables 16,440,000,000 14,391,000,000    
Global Commercial Services [Member] | Airline [Member]
       
Accounts receivable segment information        
Card Member receivables 672,000,000 836,000,000    
Global Commercial Services [Member] | Airline [Member] | Delta [Member]
       
Accounts receivable segment information        
Card Member receivables 642,000,000 628,000,000    
Global Network And Merchant Services [Member]
       
Accounts receivable segment information        
Card Member receivables $ 151,000,000 $ 159,000,000