Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Average Impaired Loans for the Period	$ 840		$ 998		$ 888		$ 990
Interest Income Recognized for the Period	4		5		10		11
Business Loans [Member]
Average Impaired Loans for the Period	791		959		841		956
Interest Income Recognized for the Period	3		5		9		11
Business Loans [Member] | Real Estate Construction [Member]
Average Impaired Loans for the Period	115		365		167		383
Interest Income Recognized for the Period			1				2
Business Loans [Member] | Real Estate Construction [Member] | Commercial Real Estate Business Line [Member]
Average Impaired Loans for the Period	114	[1]	364	[1]	166	[1]	381	[1]
Interest Income Recognized for the Period			1	[1]			2	[1]
Business Loans [Member] | Real Estate Construction [Member] | Other Business Lines [Member]
Average Impaired Loans for the Period	1	[2]	1	[2]	1	[2]	2	[2]
Business Loans [Member] | Commercial Mortgage [Member]
Average Impaired Loans for the Period	391		354		410		337
Interest Income Recognized for the Period	2		3		4		5
Business Loans [Member] | Commercial Mortgage [Member] | Commercial Real Estate Business Line [Member]
Average Impaired Loans for the Period	187	[1]	141	[1]	188	[1]	144	[1]
Interest Income Recognized for the Period	1	[1]	1	[1]	2	[1]	2	[1]
Business Loans [Member] | Commercial Mortgage [Member] | Other Business Lines [Member]
Average Impaired Loans for the Period	204	[2]	213	[2]	222	[2]	193	[2]
Interest Income Recognized for the Period	1	[2]	2	[2]	2	[2]	3	[2]
Business Loans [Member] | Lease Financing Loan [Member]
Average Impaired Loans for the Period	6		12		6		12
Business Loans [Member] | International Loan [Member]
Average Impaired Loans for the Period	6		3		4		11
Business Loans [Member] | Commercial Loan [Member]
Average Impaired Loans for the Period	273		225		254		213
Interest Income Recognized for the Period	1		1		5		4
Retail Loans [Member]
Average Impaired Loans for the Period	49		39		47		34
Interest Income Recognized for the Period	1				1
Retail Loans [Member] | Residential Mortgage Loan [Member]
Average Impaired Loans for the Period	43		35		41		31
Interest Income Recognized for the Period	1				1
Retail Loans [Member] | Consumer Loans [Member]
Average Impaired Loans for the Period	6		4		6		3
Retail Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Average Impaired Loans for the Period	1		1				1
Retail Loans [Member] | Other Consumer [Member]
Average Impaired Loans for the Period	$ 5		$ 3		$ 6		$ 2

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

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