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Accounts Receivable and Loans (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Loans segment information        
Cardmember loans $ 62,286 $ 65,229    
Less: Reserve for losses 1,367 1,471 1,680 1,874
Cardmember loans, net 60,919 63,758    
Other loans, net 541 551    
Accounts Receivable and Loans Textuals [Abstract]        
Other loans, reserves 18 20    
Variable Interest Enterprise [Member]
       
Loans segment information        
Cardmember loans 30,063 32,731    
U S Card Services [Member]
       
Loans segment information        
Cardmember loans 53,606 55,953    
U S Card Services [Member] | Variable Interest Enterprise [Member]
       
Loans segment information        
Cardmember loans, net 30,100 32,700    
International Card Services [Member]
       
Loans segment information        
Cardmember loans 8,631 9,236    
Global Commercial Services [Member]
       
Loans segment information        
Cardmember loans $ 49 $ 40