Reserves For Losses (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables - other	$ (12)	$ 1
Card Member loans reserves for losses - other	2	(16)
Allowance for Card Member Receivables and Reserves, Recoveries of Bad Debts	180	200
Allowance for Card Member Loans, Recoveries of Bad Debts	216	230
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR	8	19
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR	(2)	7
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	0	(6)
Card Member loans reserves for losses - other	(1)	(11)
Other Items [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables - other	(5)	7
Card Member loans reserves for losses - other	$ 9	$ (5)