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Accounts Receivable and Loans (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Accounts receivable segment information        
Cardmember receivables $ 41,540 $ 40,890    
Less: Cardmember reserve for losses 392 438 415 386
Cardmember receivables, net 41,148 40,452    
Other receivables, net 2,771 3,657    
Variable Interest Enterprise [Member]
       
Accounts receivable segment information        
Cardmember receivables 7,235 8,027    
Cardmember receivables, net 7,200      
Non United States [Member]
       
Accounts receivable segment information        
Cardmember receivables 12,900 12,800    
U S Card Services [Member]
       
Accounts receivable segment information        
Cardmember receivables 19,588 20,645    
Accounts Receivable and Loans Textuals [Abstract]        
Gross cardmember receivables available to settle the obligations of a variable interest entity 6,700 7,500    
International Card Services [Member]
       
Accounts receivable segment information        
Cardmember receivables 6,804 7,222    
Global Commercial Services [Member]
       
Accounts receivable segment information        
Cardmember receivables 14,985 12,829    
Global Commercial Services [Member] | Variable Interest Enterprise [Member]
       
Accounts Receivable and Loans Textuals [Abstract]        
Gross cardmember receivables available to settle the obligations of a variable interest entity 492 459    
Global Network And Merchant Services [Member]
       
Accounts receivable segment information        
Cardmember receivables $ 163 $ 194