Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity
Other noninterest income	$ 29	$ 24	$ 73	$ 82
Provision for income taxes	63	108	210	273
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	0	2	1
Provision for income taxes, amortization of LIHTC investments	17	17	48	49
Provision for income taxes	(3)	(5)	(9)	(16)
Variable Interest Entity | Low income housing tax credits
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	(16)	(16)	(46)	(47)
Variable Interest Entity | Other tax benefits related to tax credit entities
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	$ (4)	$ (6)	$ (11)	$ (18)