Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	$ 358		$ 628		$ 865
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	5		8		10
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	311		578		817
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	5		8		9
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	99		195		251
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	2		4		5
Business loans | Real estate construction
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	25		62		155
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	25	[1]	58	[1]	153	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	0	[2]	4	[2]	2	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[2]	0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	186		316		400
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	3		4		4
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	81	[1]	139	[1]	180	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	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	105	[2]	177	[2]	220	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	3	[2]	4	[2]	4	[2]
Business loans | Lease financing
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	0		3		6
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0
Business loans | International
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	1		2		5
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	47		50		48
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		1
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	35		41		42
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		1
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	12		9		6
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	8		5		0
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	4		4		6
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	$ 0		$ 0		$ 0

[1] Primarily loans to real estate developers.

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