Loans and Loans Held for Sale - Loans by Category (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Loans [Line Items]
Commercial, financial and agricultural	$ 26,224	$ 24,963	$ 23,412
Commercial real estate:
Commercial mortgage	7,877	7,720	7,544
Construction	1,007	1,093	1,057
Total commercial real estate loans	8,884	8,813	8,601
Commercial lease financing	4,396	4,551	4,796
Total commercial loans	39,504	38,327	36,809
Residential - prime loans:
Real estate - residential mortgage	2,183	2,187	2,176
Home equity loans	10,596	10,674	10,210
Total residential - prime loans	12,779	12,861	12,386
Consumer other	1,028	1,098	1,333
Credit cards	698	722	693
Total consumer loans	15,941	16,130	15,765
Total Loans	55,445	54,457	52,574
Other Loans [Member]
Residential - prime loans:
Home equity loans	315	334	401
Consumer other	63	70	79
Marine Loans [Member]
Residential - prime loans:
Consumer other	965	1,028	1,254
Key Community Bank [Member]
Residential - prime loans:
Home equity loans	10,281	10,340	9,809
Consumer other	$ 1,436	$ 1,449	$ 1,353

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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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