Loans and Commitments to Extend Credit (Loans Outstanding) (Details) (USD $) In Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 154,543	[1],[2],[3],[4]	$ 150,595	[1],[2],[3],[4]	$ 150,127
Unearned Income Net Deferred Loan Fees Unamortized Discounts And Premiums And Purchase Discounts Net	2.4		2.7
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	62,250		55,177
Commercial [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	62,250		55,177
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,413		17,934
Commercial Real Estate [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,413		17,934
Equipment Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,186		6,393
Equipment Lease Financing [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,186		6,393
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	33,163		34,226
Home Equity [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	33,163		34,226
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,655		15,999
Residential Real Estate [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,655		15,999
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,785		3,920
Credit Card [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,785		3,920
Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	18,091		16,946
Other Consumer Loans [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	18,091		16,946
TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	84,849		79,504
TOTAL CONSUMER LENDING [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 69,694		$ 71,091

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

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

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

[4] 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.