Acquisitions and Divestitures Textual ( Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Events Textuals [Abstract]
Card Member loans and receivables held for sale	$ 14,992	$ 0
CardMember Receivables And Loans Reserves	224
Total Impairment Charge	384
Impairment Of Goodwill Prepaid Services	219
Impairment Charge - Technology And Other Assets writedown to Fair Value	165
Gain on business travel joint venture transaction		$ 630
Airline [Member] | JetBlue [Member]
Business Events Textuals [Abstract]
Card Member loans and receivables held for sale	1,100
Retail | Costco [Member]
Business Events Textuals [Abstract]
Card Member loans and receivables held for sale	$ 13,900