Loans and Loans Held for Sale - Loans by Category (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Loans [Line Items]
Commercial, financial and agricultural	$ 23,715	$ 23,242	$ 20,916
Commercial real estate:
Commercial mortgage	7,474	7,720	7,409
Construction	1,060	1,003	1,172
Total commercial real estate loans	8,534	8,723	8,581
Commercial lease financing	4,774	4,915	5,106
Total commercial loans	37,023	36,880	34,603
Residential - prime loans:
Real estate - residential mortgage	2,176	2,174	2,016
Home equity loans	10,548	10,239	10,080
Total residential - prime loans	12,724	12,413	12,096
Consumer other	1,229	1,451	1,643
Credit cards	701	729
Total consumer loans	16,078	15,942	15,002
Total loans	53,101	52,822	49,605
Other Loans [Member]
Residential - prime loans:
Home equity loans	375	423	479
Consumer other	69	93	101
Marine Loans [Member]
Residential - prime loans:
Consumer other	1,160	1,358	1,542
Key Community Bank [Member]
Residential - prime loans:
Home equity loans	10,173	9,816	9,601
Consumer other	$ 1,424	$ 1,349	$ 1,263

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Amount before allowance of commercial leases and leveraged lease transactions where the entity is long-term creditor. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes leases covered under loss sharing agreements.

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Amount before allowance of credit card loans issued to individuals. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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