Card Member Receivables and Loans (Details Textuals) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net volume of Card Member receivables purchased	$ 109,000	$ 110,000
Net volume of Card Member loans purchased	2,000	$ 1,900
Deferred discount revenue on Card Member receivable	25		$ 22
RFC VIII [Member]
Related Party Transaction [Line Items]
Participation Interests In Card Member Receivables Purchased	$ 2,100		$ 4,100