Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Narrative) (Details) (USD $)	Sep. 30, 2011		Dec. 31, 2010
Troubled debt restructurings (TDRs)	$ 2,147,000,000		$ 1,658,000,000
Specific reserves in ALLL for the TDR portfolio	539,000,000		509,000,000
Nonperforming loans	3,692,000,000	[1]	4,466,000,000	[1]
Exclusions from TDRs	1,400,000,000
Nonperforming Status [Member]
Troubled debt restructurings (TDRs)	1,062,000,000		784,000,000
Accruing [Member]
Troubled debt restructurings (TDRs)	780,000,000	[2]	543,000,000	[2]
Equipment Lease Financing [Member]
Nonperforming loans	$ 30,000,000	[1]	$ 77,000,000	[1]

[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] Accruing loans have demonstrated a period of at least six months of performance under the restructured terms and are excluded from nonperforming loans.