Loans and Loans Held for Sale - Loans by Category (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Loans [Line Items]
Commercial, financial and agricultural	$ 24,317	$ 23,242	$ 21,979
Commercial real estate:
Commercial mortgage	7,544	7,720	7,529
Construction	1,058	1,003	1,067
Total commercial real estate loans	8,602	8,723	8,596
Commercial lease financing	4,550	4,915	4,960
Total commercial loans	37,469	36,880	35,535
Residential - prime loans:
Real estate - residential mortgage	2,198	2,174	2,138
Home equity loans	10,638	10,239	10,177
Total residential - prime loans	12,836	12,413	12,315
Consumer other	1,154	1,451	1,546
Credit cards	698	729	710
Total consumer loans	16,128	15,942	15,884
Total Loans	53,597	52,822	51,419
Other Loans [Member]
Residential - prime loans:
Home equity loans	353	423	409
Consumer other	71	93	98
Marine Loans [Member]
Residential - prime loans:
Consumer other	1,083	1,358	1,448
Key Community Bank [Member]
Residential - prime loans:
Home equity loans	10,285	9,816	9,768
Consumer other	$ 1,440	$ 1,349	$ 1,313

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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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