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Reserves For Losses (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables reserves for losses - other $ 35 $ 10
Cardmember loans reserves for losses - other 37 13
Allowance for Cardmember Receivables and Reserves, Recoveries of Bad Debts 99 93
Allowance for Cardmember Loans, Recoveries of Bad Debts 114 133
Unauthorized Transactions [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables reserves for losses - other (40) (33)
Cardmember loans reserves for losses - other (32) (28)
Foreign Currency Translation Adjustments [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables reserves for losses - other (2) 3
Cardmember loans reserves for losses - other (1) 10
Cardmember Bankruptcy Reserves [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables reserves for losses - other 0 18
Cardmember loans reserves for losses - other 0 4
Other Items [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables reserves for losses - other 7 2
Cardmember loans reserves for losses - other $ (4) $ 1