Loans and Loans Held for Sale (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Loans by category
Commercial, financial and agricultural	$ 19,378	$ 16,441
Commercial real estate:
Commercial mortgage	8,037	9,502
Construction	1,312	2,106
Total commercial real estate loans	9,349	11,608
Commercial lease financing	6,055	6,471
Total commercial loans	34,782	34,520
Residential - prime loans:
Real estate - residential mortgage	1,946	1,844
Home equity loans	9,764	10,180
Total residential - prime loans	11,710	12,024
Total consumer loans	14,793	15,587
Total loans	49,575	50,107
Loans Held For Sale
Commercial, financial and agricultural	19	196
Real estate - construction	35	35
Commercial Lease Financing	12	8
Total loans held for sale	728	467
Changes in loans held for sale
Balance at beginning of the period	467	443
New originations	3,982	3,058
Transfers from held to maturity, net	90	376
Loan sales	(3,721)	(3,209)
Loan draws (payments), net	(60)	(120)
Transfers to OREO / valuation adjustments	(30)	(81)
Balance at end of the period	728	467
Composition of net investment in direct financing leases
Direct financing lease receivables	4,143	4,612
Unearned income	(368)	(472)
Unguaranteed residual value	308	380
Deferred fees and costs	31	44
Net investment in direct financing leases	4,114	4,564
Segment, Discontinued Operations [Member]
Residential - prime loans:
Total loans	3,010	3,326
Loans Held For Sale
Total loans held for sale	0	15
Changes in loans held for sale
Balance at end of the period	0	15
Commercial Mortgage Backed Securities [Member]
Loans Held For Sale
Real estate - residential mortgage	567	118
Residential Mortgage [Member]
Loans Held For Sale
Real estate - residential mortgage	95	110
Other loan [Member]
Residential - prime loans:
Home equity loans	535	666
Key Community Bank [Member]
Residential - prime loans:
Home equity loans	9,229	9,514
Consumer other	1,192	1,167
Corporate Banking [Member]
Residential - prime loans:
Consumer other	1,891	2,396
Corporate Banking [Member] \| Marine loan [Member]
Residential - prime loans:
Consumer other	1,766	2,234
Corporate Banking [Member] \| Other loan [Member]
Residential - prime loans:
Consumer other	125	162
Education Lending [Member] \| Segment, Discontinued Operations [Member]
Residential - prime loans:
Total loans	3,010	3,326
Loans Held For Sale
Total loans held for sale	0	15
Changes in loans held for sale
Balance at end of the period	$ 0	$ 15

Loans Held-for-Sale, Commercial Lease Financing.

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Loans Held For Sale Commercial Real Estate Construction.

+ References

No definition available.

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Loans Held For Sale Payments.

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Net transfers from held to maturity.

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No definition available.

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Transfers To Oreo Valuation Adjustments.

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No definition available.

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The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)

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The remaining (unamortized) difference between the gross investment in a direct financing lease and the cost or carrying amount, if different, of the leased property as of the balance sheet date.

+ References

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Estimated remaining costs to be incurred to service the direct financing lease, such as taxes, maintenance and insurance and the profit thereon, that are included in the minimum lease payments.

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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The total gross amount of commercial loans (money lent to commercial entities rather than consumers) made in the form of direct financing leases where the reporting entity (lessor) only recognizes interest revenue from the lease. It also includes the amount of lease financing arising from involvement with leveraged lease transactions where the Entity is in the position of long-term creditor.

+ References

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-Subparagraph b(iii)

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Reflects the sum of the gross carrying amounts of the various categories of unpaid commercial loans and leases receivable, primarily issued to businesses. Includes: (1) commercial and industrial loans, consisting of general purpose loans to entities involved in producing, transporting, or merchandising products sold in the course of commerce; (2) agricultural loans consisting of borrowings used to finance major equipment and machinery purchases and expenses, livestock or crop production (including fisheries), and to supplement working capital needs of an entity engaged in farming operations; (3) mortgage loans secured by a [legal] security interest in real property [commercial building or business real property]; (4) obligation in the form of [promissory] notes, used for the funding of construction projects; (5) interbank and other loans to financial institutions for the purpose of liquidity management on the part of the borrower; (6) draws against credit facilities provided to companies involved in mortgage banking activities (warehousing); (7) amounts lent to businesses engaged in international activities (trade financing); (8) lease financings; and (9) loans to governmental entities.

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Reflects the sum of the gross carrying amounts of the various categories of loans made to individuals for personal needs, including mortgage, home equity, vehicles, credit card, installment, and lease financing.

+ References

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- Definition

Gross amount under revolving lines of credit outstanding extended to a homeowner and collateralized by the equity in the home. Such lines of credit are generally subordinated to the homeowner's mortgage loan or loans. Loan proceeds are generally unrestricted as to use by the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph c(i)

-Subsection I

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-IssueDate 2006-05-01

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Reflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.

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The gross amount of other loans and leases to individuals not otherwise specified in the existing taxonomy.

+ References

No definition available.

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The total gross amount of money lent to individual customers including construction financing, residential mortgage loans, and home equity lines of credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

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-Paragraph 40-43

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-Number Title 12

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-Paragraph 8

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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

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Reflects the carrying amount of commercial (money lent to commercial entities rather than consumers) and industrial loans other than for real property, held for sale to other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

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Mortgage loans to individuals not classified as held for investment but are held for sale to permanent investors. Permanent investors are enterprises that invest in mortgage loans for their own accounts. Examples of permanent investors are insurance companies, commercial or mutual savings banks, savings and loan associations, pension plans and real estate investment trusts. Mortgage loans exclude mortgage-backed securities which are considered a debt security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 65

-Paragraph 1, 34

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

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-Subparagraph h

-Subsection I

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Reflects the gross carrying amount of unpaid loans that had been issued to businesses to construct a facility. Acquisition, development and construction (ADC) loans are generally issued sequentially and the net proceeds of the latest debt is used by the borrower to pay off the preceding loan. A construction loan ( in the form of a promissory note) is generally expected to be paid off with the net proceeds from permanent financing.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to provide financing for cash needs, financial asset purchases, or farm-related purposes. Includes all loans not included in another category. This category shall include, but not be limited to, loans to real estate investment trusts, mortgage companies, banks, and other financial institutions; loans for carrying securities; and loans for agricultural purposes. Do not include loans secured primarily by developed real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reflects the gross carrying amount of unpaid loans issued to businesses to provide financing on existing land or a building, which, pursuant to terms of the underlying debt instrument, are secured at a minimum but possibly exclusively by that real property. Mortgages represent permanent financing, and are issued to replace previously existing mortgages or pay off acquisition, development and construction loans, or to provide cash to the borrower.

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-Publisher AICPA

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-Publisher SEC

-Name Regulation S-X (SX)

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-Paragraph 7

-Subparagraph a

-Article 9

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Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The aggregate amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market (approximates fair value). Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 65

-Paragraph 4, 5, 6, 7, 8, 9, 12, 17, 28, 29

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-Number 210

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-Subparagraph a

-Article 9

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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

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-Section 563c.102

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-Subparagraph h

-Subsection I

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Reconcile the changes in loans that will be sold to other entities balances to the amounts presented in the consolidated statement of cash flows. Enter the additions to trade accounts that will be sold to other entities for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

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Reconcile the changes in loans that will be sold to other entities balances to the amounts presented in the consolidated statement of cash flows. Enter the deductions to trade accounts that will be sold to other entities for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

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-Subparagraph d

+ Details

Name:	us-gaap_LoansReceivableHeldForSaleReconciliationToCashFlowDeductionsFromHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration