Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Age Analysis of Past Due Accruing Loans) (Details) (USD $)	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	$ 139,605,000,000		$ 133,823,000,000
30-59 Days Past Due	1,007,000,000		1,212,000,000
60-89 Days Past Due	544,000,000		605,000,000
90 Days Or More Past Due	2,768,000,000		2,709,000,000
Total Past Due	4,319,000,000	[1]	4,526,000,000	[1]
Nonperforming loans	3,692,000,000	[2]	4,466,000,000	[2]
Purchased impaired loans	6,927,000,000		7,780,000,000		8,130,000,000
Total Loans	154,543,000,000	[3],[4],[5],[6]	150,595,000,000	[3],[4],[5],[6]	150,127,000,000
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	60,843,000,000		53,273,000,000
30-59 Days Past Due	163,000,000		251,000,000
60-89 Days Past Due	54,000,000		92,000,000
90 Days Or More Past Due	34,000,000		59,000,000
Total Past Due	251,000,000	[1]	402,000,000	[1]
Nonperforming loans	994,000,000	[2]	1,253,000,000	[2]
Purchased impaired loans	162,000,000		249,000,000
Total Loans	62,250,000,000		55,177,000,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	14,071,000,000		14,713,000,000
30-59 Days Past Due	84,000,000		128,000,000
60-89 Days Past Due	25,000,000		62,000,000
90 Days Or More Past Due	13,000,000		43,000,000
Total Past Due	122,000,000	[1]	233,000,000	[1]
Nonperforming loans	1,425,000,000	[2]	1,835,000,000	[2]
Purchased impaired loans	795,000,000		1,153,000,000
Total Loans	16,413,000,000		17,934,000,000
Equipment Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	6,141,000,000		6,276,000,000
30-59 Days Past Due	9,000,000		37,000,000
60-89 Days Past Due	4,000,000		2,000,000
90 Days Or More Past Due	2,000,000		1,000,000
Total Past Due	15,000,000	[1]	40,000,000	[1]
Nonperforming loans	30,000,000	[2]	77,000,000	[2]
Total Loans	6,186,000,000		6,393,000,000
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	29,387,000,000		30,334,000,000
30-59 Days Past Due	177,000,000		159,000,000
60-89 Days Past Due	101,000,000		91,000,000
90 Days Or More Past Due	206,000,000		174,000,000
Total Past Due	484,000,000	[1]	424,000,000	[1]
Nonperforming loans	484,000,000	[2],[7]	448,000,000	[2],[7]
Purchased impaired loans	2,808,000,000		3,020,000,000
Total Loans	33,163,000,000		34,226,000,000
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	8,128,000,000		9,150,000,000
30-59 Days Past Due	319,000,000	[8]	331,000,000	[8]
60-89 Days Past Due	191,000,000	[8]	225,000,000	[8]
90 Days Or More Past Due	2,135,000,000	[8]	2,121,000,000	[8]
Total Past Due	2,645,000,000	[1],[8]	2,677,000,000	[1],[8]
Nonperforming loans	722,000,000	[2],[7],[9]	818,000,000	[2],[7],[9]
Purchased impaired loans	3,160,000,000		3,354,000,000
Total Loans	14,655,000,000		15,999,000,000
Residential Real Estate [Member] | Thirty To Fifty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Residential Real Estate [Member] | Sixty To Eighty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Residential Real Estate [Member] | Ninety Days Or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	2,000,000,000		2,000,000,000
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	3,668,000,000		3,765,000,000
30-59 Days Past Due	39,000,000		46,000,000
60-89 Days Past Due	26,000,000		32,000,000
90 Days Or More Past Due	45,000,000		77,000,000
Total Past Due	110,000,000	[1]	155,000,000	[1]
Nonperforming loans	7,000,000	[10],[2],[7]
Total Loans	3,785,000,000		3,920,000,000
Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	17,367,000,000		16,312,000,000
30-59 Days Past Due	216,000,000	[11]	260,000,000	[11]
60-89 Days Past Due	143,000,000	[11]	101,000,000	[11]
90 Days Or More Past Due	333,000,000	[11]	234,000,000	[11]
Total Past Due	692,000,000	[1],[11]	595,000,000	[1],[11]
Nonperforming loans	30,000,000	[2],[7]	35,000,000	[2],[7]
Purchased impaired loans	2,000,000		4,000,000
Total Loans	18,091,000,000		16,946,000,000
Other Consumer Loans [Member] | Thirty To Fifty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	200,000,000		200,000,000
Other Consumer Loans [Member] | Sixty To Eighty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Other Consumer Loans [Member] | Ninety Days Or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	$ 300,000,000		$ 200,000,000
Current or Less Than Thirty Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	90.34%		88.86%
Thirty To Fifty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.65%		0.81%
Sixty To Eighty Nine Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.35%		0.40%
Ninety Days Or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	1.79%		1.80%
Total Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	2.79%		3.01%
Nonperforming Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	2.39%		2.97%
Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	4.48%		5.16%
Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	100.00%		100.00%

[1] Past due loan amounts exclude purchased impaired loans as they are considered current loans due to the accretion of interest income.

[2] 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.

[3] Amounts represent items for which the Corporation has elected the fair value option.

[4] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[5] Future accretable yield related to purchased impaired loans is not included in loans outstanding.

[6] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $2.4 billion and $2.7 billion atSeptember 30, 2011 and December 31, 2010, respectively.

[7] 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.

[8] Past due loan amounts at September 30, 2011, include government insured or guaranteed residential real estate mortgages, totaling $.1 billion for 30 to 59 days past due, $.1billion for 60 to 89 days past due and $2.0 billion for 90 days or more past due. Past due loan amounts at December 31, 2010, include government insured or guaranteed residential real estate mortgages, totaling $.1 billion for 30 to 59 days past due, $.1 billion for 60 to 89 days past due and $2.0 billion for 90 days or more past due.

[9] 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.

[10] 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.

[11] Past due loan amounts at September 30, 2011, include government insured or guaranteed other consumer loans, totaling $.2 billion for 30 to 59 days past due, $.1 billion for 60 to 89 days past due and $.3 billion for 90 days or more past due. Past due loan amounts at December 31, 2010, include government insured or guaranteed other consumer loans, totaling $.2 billion for 30 to 59 days past due, $.1 billion for 60 to 89 days past due and $.2 billion for 90 days or more past due.