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Accounts Receivable and Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts receivable segment information        
Card Member receivables $ 44,473 $ 44,133    
Less: Reserve for losses 446 462 $ 429 $ 465
Card Member receivables, net 44,027 43,671    
Other receivables, net 2,633 3,024    
Accounts Receivable and Loans Textuals [Abstract]        
Other receivables, reserves 44 43    
Variable Interest Enterprise [Member]        
Accounts receivable segment information        
Card Member receivables 5,802 6,649    
Non United States [Member]        
Accounts receivable segment information        
Card Member receivables 12,400 11,900    
U S Consumer Services [Member]        
Accounts receivable segment information        
Card Member receivables 10,332 11,807    
U S Consumer 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 5,800 6,600    
International Consumer and Network Services [Member]        
Accounts receivable segment information        
Card Member receivables 5,563 5,599    
Global Commercial Services [Member]        
Accounts receivable segment information        
Card Member receivables $ 28,578 $ 26,727