Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entity
Other noninterest income	$ 20	$ 25
Provision for income taxes	(21)	85
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	1
Provision for income taxes	(3)	(3)
Variable Interest Entity | Low income housing tax credits
Variable Interest Entity
Provision for income taxes, amortization of LIHTC investments	17	15
Provision for income taxes, affordable housing tax credits and other tax benefits	(16)	(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	$ (4)	$ (3)