Asset Quality (Age Analysis of Past Due Accruing Loans) (Details) (USD $)	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	$ 164,974,000,000		$ 144,249,000,000
30-59 Days Past Due	893,000,000		1,018,000,000
60-89 Days Past Due	534,000,000		547,000,000
90 Days Or More Past Due	2,483,000,000		2,973,000,000
Total Past Due	3,910,000,000	[1]	4,538,000,000	[1]
Nonperforming loans	3,458,000,000	[2]	3,560,000,000	[2]
Purchased impaired loans	8,083,000,000		6,667,000,000		7,256,000,000
Total loans	180,425,000,000	[3],[4],[5],[6]	159,014,000,000	[3],[4],[5],[6]	150,319,000,000
Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	91.43%		90.72%
30-59 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.49%		0.64%
60-89 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.30%		0.34%
90 Days Or More Past Due
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	1.38%		1.87%
Total Past Due
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	2.17%		2.85%
Nonperforming Loans
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	1.92%		2.24%
Purchased Impaired
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	4.48%		4.19%
Total Loans
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	100.00%		100.00%
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	77,476,000,000		64,437,000,000
30-59 Days Past Due	130,000,000		122,000,000
60-89 Days Past Due	65,000,000		47,000,000
90 Days Or More Past Due	34,000,000		49,000,000
Total Past Due	229,000,000	[1]	218,000,000	[1]
Nonperforming loans	791,000,000		899,000,000
Purchased impaired loans	405,000,000		140,000,000
Total loans	78,901,000,000		65,694,000,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	15,967,000,000		14,010,000,000
30-59 Days Past Due	123,000,000		96,000,000
60-89 Days Past Due	105,000,000		35,000,000
90 Days Or More Past Due	16,000,000		6,000,000
Total Past Due	244,000,000	[1]	137,000,000	[1]
Nonperforming loans	1,142,000,000		1,345,000,000
Purchased impaired loans	1,127,000,000		712,000,000
Total loans	18,480,000,000		16,204,000,000
Equipment Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	6,737,000,000		6,367,000,000
30-59 Days Past Due	5,000,000		22,000,000
60-89 Days Past Due	2,000,000		5,000,000
90 Days Or More Past Due	1,000,000
Total Past Due	8,000,000	[1]	27,000,000	[1]
Nonperforming loans	19,000,000		22,000,000
Total loans	6,764,000,000		6,416,000,000
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	32,152,000,000	[7]	29,288,000,000	[7]
30-59 Days Past Due	124,000,000	[7],[8]	173,000,000	[7],[8]
60-89 Days Past Due	68,000,000	[7],[8]	114,000,000	[7],[8]
90 Days Or More Past Due			221,000,000	[7],[8]
Total Past Due	192,000,000	[1],[7],[8]	508,000,000	[1],[7],[8]
Nonperforming loans	722,000,000	[7]	529,000,000	[7]
Purchased impaired loans	2,772,000,000	[7]	2,764,000,000	[7]
Total loans	35,838,000,000	[7],[8]	33,089,000,000	[7],[8]
Home Equity [Member] | 30-59 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Past Due Accruing Loans Reduction Amount	42,000,000
Home Equity [Member] | 60-89 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Past Due Accruing Loans Reduction Amount	27,000,000
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	8,864,000,000		7,935,000,000
30-59 Days Past Due	271,000,000	[10],[9]	302,000,000	[10],[9]
60-89 Days Past Due	143,000,000	[10],[9]	176,000,000	[10],[9]
90 Days Or More Past Due	2,029,000,000	[10],[9]	2,281,000,000	[10],[9]
Total Past Due	2,443,000,000	[1],[10],[9]	2,759,000,000	[1],[10],[9]
Nonperforming loans	739,000,000		726,000,000
Purchased impaired loans	3,777,000,000		3,049,000,000
Total loans	15,823,000,000	[10]	14,469,000,000	[10]
Residential Real Estate [Member] | 30-59 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Past Due Accruing Loans Reduction Amount	28,000,000
Residential Real Estate [Member] | 60-89 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Past Due Accruing Loans Reduction Amount	14,000,000
Residential Real Estate [Member] | 90 Days Or More Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	1,900,000,000		2,100,000,000
Past Due Accruing Loans Reduction Amount	28,000,000
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	4,024,000,000		3,857,000,000
30-59 Days Past Due	33,000,000		38,000,000
60-89 Days Past Due	22,000,000		25,000,000
90 Days Or More Past Due	38,000,000		48,000,000
Total Past Due	93,000,000	[1]	111,000,000	[1]
Nonperforming loans	6,000,000		8,000,000
Total loans	4,123,000,000		3,976,000,000
Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Current or Less Than 30 Days Past Due	19,754,000,000		18,355,000,000
30-59 Days Past Due	207,000,000	[11]	265,000,000	[11]
60-89 Days Past Due	129,000,000	[11]	145,000,000	[11]
90 Days Or More Past Due	365,000,000	[11]	368,000,000	[11]
Total Past Due	701,000,000	[1],[11]	778,000,000	[1],[11]
Nonperforming loans	39,000,000		31,000,000
Purchased impaired loans	2,000,000		2,000,000
Total loans	20,496,000,000		19,166,000,000
Other Consumer [Member] | 30-59 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	200,000,000		200,000,000
Other Consumer [Member] | 60-89 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	100,000,000		100,000,000
Other Consumer [Member] | 90 Days Or More Past Due
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed loans included in past due loans	$ 300,000,000		$ 300,000,000

[1] Past due loan amounts exclude purchased impaired loans as they are considered performing, even if contractually past due (or if we do not expect to receive payment in full based on the original contractual terms), as we are currently accreting interest income over the expected life of the loans.

[2] Nonperforming loans exclude certain government insured or guaranteed loans, loans held for sale, loans accounted for under the fair value option and purchased impaired loans.

[3] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $3.1 billion and $2.3 billion atJune 30, 2012 and December 31, 2011, respectively.

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

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

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

[7] In the first quarter of 2012, we adopted a policy stating that Home equity loans past due 90 days or more would be placed on nonaccrual status. Prior policy required that these loans be past due 180 days before being placed on nonaccrual status.

[8] In the second quarter of 2012, the Home equity amounts as of June 30, 2012 were reduced by $42 million and $27 million for the accruing loans past due 30 to 59 Days and 60 to 89 Days respectively, to correct for immaterial amounts. Prior period amounts have not been adjusted.

[9] Past due loan amounts at June 30, 2012, 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 $1.9 billion for 90 days or more past due. Past due loan amounts at December 31, 2011, 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 $2.1 billion for 90 days or more past due.

[10] In the second quarter of 2012, the Residential real estate amounts as of June 30, 2012 were reduced by $28 million, $14 million and $28 million for the accruing loans past due 30 to 59 Days, 60 to 89 Days and 90 Days or More respectively, to correct for immaterial amounts. Prior period amounts have not been adjusted.

[11] Past due loan amounts at June 30, 2012, 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, 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.