Consolidated Statement of Cash Flows (Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Non cash investing activities
Transfer of Card Member receivables, during the fourth quarter of 2015, to Card Member receivables held for sale, net of reserves.	$ 0	$ 21	$ 0