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Reserves For Losses (Details Textuals) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other $ (21) $ 1
Card Member loans reserves for losses - other (2) (14)
Allowance for Card Member Receivables and Reserves, Recoveries of Bad Debts 269 304
Allowance for Card Member Loans, Recoveries of Bad Debts 324 343
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR 14 16
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR (5) 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 (6) (3)
Card Member loans reserves for losses - other (7) (8)
Other Items [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other (8) 4
Card Member loans reserves for losses - other $ 11 $ (6)