Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (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
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	$ 256		$ 377		$ 262		$ 391
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		2		2		3
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	209		335		214		346
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		2		2		3
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	56		103		62		108
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		1		0		2
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	17	[1]	26	[1]	18	[1]	26	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	134		206		132		211
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1		2		1
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	63	[1]	87	[1]	62	[1]	91	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	71	[2]	119	[2]	70	[2]	120	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1	[2]	1	[2]	2	[2]	1	[2]
Business loans | Lease financing
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period					0		1
Individually Evaluated Impaired Loans Interest Income Recognized for the Period					0		0
Business loans | International
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	2		0		2		0
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	47		42		48		45
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	31		33		32		35
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	16		9		16		10
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	12		5		12		6
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	4		4		4		4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	$ 0		$ 0		$ 0		$ 0

[1] Primarily loans to real estate developers.

[2] Primarily loans secured by owner-occupied real estate.