Reserves For Losses (Details Textuals) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables reserves for losses - other	$ (115)	$ (73)
Card Member loans reserves for losses - other	(110)	(77)
Allowance for Card Member Receivables and Reserves, Recoveries of Bad Debts	304	292
Allowance for Card Member Loans, Recoveries of Bad Debts	343	382
Unauthorized Transactions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables reserves for losses - other	(117)	(100)
Card Member loans reserves for losses - other	(96)	(84)
Foreign Currency Translation Adjustments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables reserves for losses - other	(3)	4
Card Member loans reserves for losses - other	(8)	10
Card Member Bankruptcy Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables reserves for losses - other	0	18
Card Member loans reserves for losses - other	0	4
Other Items [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Card Member receivables reserves for losses - other	5	5
Card Member loans reserves for losses - other	$ (6)	$ (7)