Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Variable Interest Entity
Other noninterest income	$ 22	$ 29	$ 44	$ 58
Provision for income taxes	93	99	147	165
Variable Interest Entity
Variable Interest Entity
Other noninterest income	1	0	2	1
Provision for income taxes, amortization of LIHTC investments	16	16	31	32
Provision for income taxes	(3)	(6)	(6)	(11)
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	(15)	(16)	(30)	(31)
Other tax benefits related to tax credit entities | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	$ (4)	$ (6)	$ (7)	$ (12)