Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Nonperforming Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Nonperforming loans	$ 3,692	[1]	$ 4,466	[1]
Foreclosed and other assets	606		657
Total nonperforming assets	4,298		5,123
Nonperforming loans to total loans	2.39%		2.97%
Nonperforming assets to total loans, OREO and foreclosed assets	2.77%		3.39%
Nonperforming assets to total assets	1.59%		1.94%
Exclusions from nonperforming residential real estate accounted for under fair value option	68
Exclusions from Other Real Estate Owned	256		178
Commercial [Member]
Nonperforming loans	994	[1]	1,253	[1]
Commercial Real Estate [Member]
Nonperforming loans	1,425	[1]	1,835	[1]
Equipment Lease Financing [Member]
Nonperforming loans	30	[1]	77	[1]
TOTAL COMMERCIAL LENDING [Member]
Nonperforming loans	2,449	[1]	3,165	[1]
Home Equity [Member]
Nonperforming loans	484	[1],[2]	448	[1],[2]
Residential Real Estate [Member]
Nonperforming loans	722	[1],[2],[3]	818	[1],[2],[3]
Credit Card [Member]
Nonperforming loans	7	[1],[2],[4]
Other Consumer Loans [Member]
Nonperforming loans	30	[1],[2]	35	[1],[2]
TOTAL CONSUMER LENDING [Member]
Nonperforming loans	1,243	[1],[2]	1,301	[1],[2]
Other Real Estate Owned (OREO) [Member]
Foreclosed and other assets	553	[5]	589	[5]
Foreclosed and Other Assets [Member]
Foreclosed and other assets	53		68
TOTAL FORECLOSED AND OTHER ASSETS [Member]
Foreclosed and other assets	$ 606		$ 657

[1] Nonperforming loans do not include government insured or guaranteed loans, loans held for sale, loans accounted for under the fair value option and purchased impaired loans.

[2] Excludes most consumer loans and lines of credit, not secured by residential real estate, which are charged off after 120 to 180 days past due and are not placed on nonperforming status.

[3] Effective in 2011, nonperforming residential real estate excludes loans of $68 million accounted for under the fair value option as of September 30, 2011. The comparable balance at December 31, 2010 was not material.

[4] Effective in the second quarter 2011, the commercial nonaccrual policy was applied to certain small business credit card balances. This change resulted in loans being placed on nonaccrual status when they become 90 days or more past due, rather than being excluded and charged off at 180 days past due.

[5] Other real estate owned excludes $256 million and $178 million at September 30, 2011, and December 31, 2010, respectively, related to serviced loans insured by the Federal Housing Administration (FHA) or guaranteed by the Department of Veterans Affairs (VA).