Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Commercial Lending Asset Quality Indicators) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Commercial [Member]
Pass Rated	$ 52,966	[1]	$ 48,556	[1]
Criticized Commercial Loans - Special Mention	1,771	[2]	1,926	[2]
Criticized Commercial Loans - Substandard	3,410	[3]	3,883	[3]
Criticized Commercial Loans - Doubtful	306	[4]	563	[4]
Total Loans	58,453		54,928
Commercial Real Estate [Member]
Pass Rated	10,412	[1]	11,014	[1]
Criticized Commercial Loans - Special Mention	1,141	[2]	1,289	[2]
Criticized Commercial Loans - Substandard	3,443	[3]	3,914	[3]
Criticized Commercial Loans - Doubtful	369	[4]	564	[4]
Total Loans	15,365		16,781
Equipment Lease Financing [Member]
Pass Rated	5,969	[1]	6,121	[1]
Criticized Commercial Loans - Special Mention	101	[2]	64	[2]
Criticized Commercial Loans - Substandard	120	[3]	162	[3]
Criticized Commercial Loans - Doubtful	20	[4]	46	[4]
Total Loans	6,210		6,393
Purchased Impaired Loans [Member]
Pass Rated	98	[1]	106	[1]
Criticized Commercial Loans - Special Mention	79	[2]	35	[2]
Criticized Commercial Loans - Substandard	747	[3]	883	[3]
Criticized Commercial Loans - Doubtful	197	[4]	378	[4]
Total Loans	1,121		1,402
TOTAL COMMERCIAL LENDING [Member]
Pass Rated	69,445	[1],[5]	65,797	[1],[5]
Criticized Commercial Loans - Special Mention	3,092	[2],[5]	3,314	[2],[5]
Criticized Commercial Loans - Substandard	7,720	[3],[5]	8,842	[3],[5]
Criticized Commercial Loans - Doubtful	892	[4],[5]	1,551	[4],[5]
Total Loans	$ 81,149	[5]	$ 79,504	[5]

[1] Pass Rated loans include loans not classified as "Special Mention", "Substandard", or "Doubtful".

[2] Special Mention rated loans have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of repayment prospects at some future date. These loans do not expose us to sufficient risk to warrant adverse classification at this time.

[3] Substandard rated loans have a well-defined weakness or weaknesses that jeopardize the collection or liquidation of debt. They are characterized by the distinct possibility  that we will sustain some loss if the deficiencies are not corrected.

[4] Doubtful rated loans possess all the inherent weaknesses of a Substandard loan with the additional characteristics that the weakness makes collection or liquidation in full improbable due to existing facts, conditions, and values.

[5] Loans are included above based on their contractual terms as "Pass", "Special Mention", "Substandard" or "Doubtful".