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Reserves For Losses (Details Textuals) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other $ 1 $ (11)
Card Member loans reserves for losses - other 11 (4)
Allowance for Card Member Receivables and Reserves, Recoveries of Bad Debts 101 99
Allowance for Card Member Loans, Recoveries of Bad Debts 88 103
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR 10 31
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR 13 16
Loans transferred from HFS to held for investment 20  
CardMember reserves associated with loans held for investments 7  
Unauthorized Transactions [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other   0
Card Member loans reserves for losses - other   0
Foreign Currency Translation Adjustments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other 2 (7)
Card Member loans reserves for losses - other 2 (7)
Other Items [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Card Member receivables - other (1) (4)
Card Member loans reserves for losses - other $ 2 $ 3