Non-Interest Revenue and Expense Detail (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Details Of Certain Statements Of Income Lines Details [Abstract]
Professional services	$ 687	$ 731	$ 1,966	$ 2,240
Occupancy and equipment	523	432	1,372	1,361
Card and merchant-related fraud Losses	64	96	247	282
Communications	84	91	257	285
Gain on business travel joint venture	0	(15)	0	(641)
Other	277	261	727	866
Total other, net	$ 1,635	$ 1,596	$ 4,569	$ 4,393