Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Variable Interest Entity
Other noninterest income	$ 25	$ 22
Provision for income taxes	85	54
Variable Interest Entity
Variable Interest Entity
Other noninterest income	1	1
Provision for income taxes, amortization of LIHTC investments	15	15
Provision for income taxes	(3)	(3)
Variable Interest Entity | Low income housing tax credits
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	(15)	(15)
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	$ (3)	$ (3)