Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Variable Interest Entity [Line Items]
Other noninterest income	$ 37	$ 48	$ 70	$ 86
Provision for income taxes	70	64	134	127
Variable Interest Entity
Variable Interest Entity [Line Items]
Other noninterest income	(1)	1	(3)	0
Provision for income taxes	(7)	(5)	(13)	(11)
Proportional amortization method classified in income taxes | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	14	14	28	27
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	(14)	(14)	(28)	(28)
Other tax benefits related to tax credit entities | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	$ (7)	$ (5)	$ (13)	$ (10)