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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Variable Interest Entity
Other noninterest income	$ 35	$ 22	$ 55	$ 47
Provision for income taxes	27	87	6	172
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	0	0	1
Provision for income taxes	(2)	(2)	(5)	(5)
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, amortization of LIHTC investments	17	17	34	32
Provision for income taxes, affordable housing tax credits and other tax benefits	(16)	(15)	(32)	(30)
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	$ (3)	$ (4)	$ (7)	$ (7)