Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Loan Losses And Related Loan Amounts) (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		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 11		$ 13		$ 20		$ 29
PCI loans	3				3				5
Total loans	47,882				47,882				45,470
Allowance for PCI loans	0				0				0
Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	43,846				43,846				41,536
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,036				4,036				3,934
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	594		617		598		629
Loan charge-offs	(28)		(35)		(58)		(73)
Recoveries on loans previously charged-off	19		18		37		32
Net loan charge-offs	(9)		(17)		(21)		(41)
Provision for loan losses	6		13		14		25
Balance at end of period	591		613		591		613
As a percentage of total loans	1.23%		1.35%		1.23%		1.35%
Allowance for loan losses individually evaluated for impairment	39		56		39		56
Allowance for loan losses collectively evaluated for impairment	552		557		552		557
Total allowance for loan losses	591		613		591		613
Loans individually evaluated for impairment	260		356		260		356
Loans collectively evaluated for impairment	47,619		45,078		47,619		45,078
PCI loans	3	[1]	25	[1]	3	[1]	25	[1]
Total loans	47,882		45,459		47,882		45,459
Financing Receivable [Member] | Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	530		544		531		552
Loan charge-offs	(24)		(30)		(51)		(64)
Recoveries on loans previously charged-off	15		15		31		27
Net loan charge-offs	(9)		(15)		(20)		(37)
Provision for loan losses	7		13		17		27
Balance at end of period	528		542		528		542
As a percentage of total loans	1.21%		1.30%		1.21%		1.30%
Allowance for loan losses individually evaluated for impairment	39		56		39		56
Allowance for loan losses collectively evaluated for impairment	489		486		489		486
Total allowance for loan losses	528		542		528		542
Loans individually evaluated for impairment	215		314		215		314
Loans collectively evaluated for impairment	43,631		41,390		43,631		41,390
PCI loans	0	[1]	20	[1]	0	[1]	20	[1]
Total loans	43,846		41,724		43,846		41,724
Financing Receivable [Member] | Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	64		73		67		77
Loan charge-offs	(4)		(5)		(7)		(9)
Recoveries on loans previously charged-off	4		3		6		5
Net loan charge-offs	0		(2)		(1)		(4)
Provision for loan losses	(1)		0		(3)		(2)
Balance at end of period	63		71		63		71
As a percentage of total loans	1.55%		1.91%		1.55%		1.91%
Allowance for loan losses individually evaluated for impairment	0		0		0		0
Allowance for loan losses collectively evaluated for impairment	63		71		63		71
Total allowance for loan losses	63		71		63		71
Loans individually evaluated for impairment	45		42		45		42
Loans collectively evaluated for impairment	3,988		3,688		3,988		3,688
PCI loans	3	[1]	5	[1]	3	[1]	5	[1]
Total loans	$ 4,036		$ 3,735		$ 4,036		$ 3,735

[1] No allowance for loan losses was required for PCI loans at June 30, 2014 and 2013.