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Reserves For Losses (Textuals) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables - other $ (41) $ (70)
Cardmember loans - other (53) (35)
Cardmember receivables net write-offs (346) (260)
Cardmember loans net write-offs - principal (678) (992)
Valuation allowances and reserves, recoveries 193 171
Allowance for loan and lease losses, recoveries of bad debts 258 300
Unauthorized transactions [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables - other (63) (77)
Cardmember loans - other 53 47
Foreign currency translation adjustments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables - other (2) 5
Cardmember loans - other 1 (13)
Cardmember bankruptcy reserves [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables - other 18 0
Cardmember loans - other (4) 0
Other items [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cardmember receivables - other 6 2
Cardmember loans - other $ 3 $ 1