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Reserves For Losses (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other $ (17) $ 6
Card Member loans reserves for losses - other 2 (5)
Allowance for Card Member Receivables and Reserves, Recoveries of Bad Debts 92 99
Allowance for Card Member Loans, Recoveries of Bad Debts 107 114
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR 2 14
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR (2) 6
Unauthorized Transactions [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other (7)  
Card Member loans reserves for losses - other (6)  
Foreign Currency Translation Adjustments [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other 0 (2)
Card Member loans reserves for losses - other (1) (1)
Other Items [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other (10) 8
Card Member loans reserves for losses - other $ 9 $ (4)