Non-Interest Revenue and Expense Detail (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Details Of Certain Statements Of Income Lines Details [Abstract]
Professional services	$ 630	$ 687	$ 1,862	$ 1,966
Occupancy and equipment	429	523	1,332	1,372
Card and merchant-related fraud losses	67	64	182	247
Communications	68	84	231	257
Gain on sale of held for sale (HFS) portfolio	0	0	(1,218)	0
Other	304	277	999	727
Total other, net	$ 1,498	$ 1,635	$ 3,388	$ 4,569