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Reserves For Losses (Details Textuals) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other $ (162) $ (112) $ (158)
Card Member loans - other (148) (115) (104)
Allowance for Card Member Receivables, Recoveries of Bad Debts 402 383 349
Allowance for Card Member Loans, Recoveries of Bad Debts 452 493 578
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR 12 87 82
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR (1) 25 29
Unauthorized Transactions [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other (160) (141) (161)
Card Member loans - other (130) (116) (103)
Foreign Currency Translation Adjustments [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other (4) 2 (2)
Card Member loans - other (12) 7 (2)
Card Member Bankruptcy Reserves [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other   18  
Card Member loans - other   4  
Other Items [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other 2 9 5
Card Member loans - other $ (6) $ (10) $ 1