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, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Average Impaired Loans for the Period	$ 685		$ 879		$ 713		$ 910
Interest Income Recognized for the Period	2		3		4		5
Business loans
Average Impaired Loans for the Period	636		831		663		863
Interest Income Recognized for the Period	2		3		4		5
Business loans | Real estate construction
Average Impaired Loans for the Period	66		160		79		190
Interest Income Recognized for the Period	0		0		0		0
Business loans | Commercial mortgage
Average Impaired Loans for the Period	350		416		352		418
Interest Income Recognized for the Period	1		1		2		2
Business loans | Lease Financing
Average Impaired Loans for the Period	3		7		3		7
Interest Income Recognized for the Period	0		0		0		0
Business loans | International
Average Impaired Loans for the Period	2		6		4		4
Interest Income Recognized for the Period	0		0		0		0
Business loans | Commercial
Average Impaired Loans for the Period	215		242		225		244
Interest Income Recognized for the Period	1		2		2		3
Business loans | Commercial real estate business line | Real estate construction
Average Impaired Loans for the Period	61	[1]	159	[1]	74	[1]	189	[1]
Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial real estate business line | Commercial mortgage
Average Impaired Loans for the Period	156	[1]	192	[1]	153	[1]	187	[1]
Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Other business lines | Real estate construction
Average Impaired Loans for the Period	5	[2]	1	[2]	5	[2]	1	[2]
Interest Income Recognized for the Period	0	[2]	0	[2]	0	[2]	0	[2]
Business loans | Other business lines | Commercial mortgage
Average Impaired Loans for the Period	194	[2]	224	[2]	199	[2]	231	[2]
Interest Income Recognized for the Period	1	[2]	1	[2]	2	[2]	2	[2]
Retail Loans
Average Impaired Loans for the Period	49		48		50		47
Interest Income Recognized for the Period	0		0		0		0
Retail Loans | Residential mortgage
Average Impaired Loans for the Period	41		41		43		39
Interest Income Recognized for the Period	0		0		0		0
Retail Loans | Consumer
Average Impaired Loans for the Period	8		7		7		8
Interest Income Recognized for the Period	0		0		0		0
Retail Loans | Home equity | Consumer
Average Impaired Loans for the Period	5		0		3		0
Interest Income Recognized for the Period	0		0		0		0
Retail Loans | Other consumer | Consumer
Average Impaired Loans for the Period	3		7		4		8
Interest Income Recognized for the Period	$ 0		$ 0		$ 0		$ 0

[1] Primarily loans to real estate investors and developers.

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