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Accounts Receivable and Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts receivable segment information        
Card Member receivables $ 44,879 $ 44,851    
Less: Reserve for losses 420 465 $ 413 $ 386
Card Member receivables, net 44,459 44,386    
Other receivables, net 2,805 2,614    
Accounts Receivable and Loans Textuals [Abstract]        
Other receivables, reserves 61 61    
Variable Interest Enterprise [Member]        
Accounts receivable segment information        
Card Member receivables 6,231 7,025    
Non United States [Member]        
Accounts receivable segment information        
Card Member receivables 12,900 13,300    
U S Card Services [Member]        
Accounts receivable segment information        
Card Member receivables 22,087 22,468    
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 6,200 7,000    
International Card Services [Member]        
Accounts receivable segment information        
Card Member receivables 6,804 7,653    
Global Commercial Services [Member]        
Accounts receivable segment information        
Card Member receivables 15,853 14,583    
Global Commercial Services [Member] | Airline [Member]        
Accounts receivable segment information        
Card Member receivables 341 636    
Global Commercial Services [Member] | Airline [Member] | Delta [Member]        
Accounts receivable segment information        
Card Member receivables 272 606    
Global Network And Merchant Services [Member]        
Accounts receivable segment information        
Card Member receivables $ 135 $ 147