Loans and Loans Held for Sale (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Loans by category
Commercial, financial and agricultural	$ 20,386	$ 19,378	$ 16,883
Commercial real estate:
Commercial mortgage	7,409	8,037	8,069
Construction	1,172	1,312	1,631
Total commercial real estate loans	8,581	9,349	9,700
Commercial lease financing	5,636	6,055	6,105
Total commercial loans	34,603	34,782	32,688
Residential - prime loans:
Real estate - residential mortgage	2,016	1,946	1,838
Home equity loans	10,080	9,764	10,026
Total residential - prime loans	12,096	11,710	11,864
Total consumer loans	15,002	14,793	15,152
Total loans	49,605	49,575	47,840
Segment, Discontinued Operations [Member]
Residential - prime loans:
Total loans	2,830	3,010	3,161
Other loan [Member]
Residential - prime loans:
Home equity loans	479	535	595
Community Bank [Member]
Residential - prime loans:
Home equity loans	9,601	9,229	9,431
Consumer other	1,263	1,192	1,157
Corporate Banking [Member]
Residential - prime loans:
Consumer other	1,643	1,891	2,131
Corporate Banking [Member] \| Marine loan [Member]
Residential - prime loans:
Consumer other	1,542	1,766	1,989
Corporate Banking [Member] \| Other loan [Member]
Residential - prime loans:
Consumer other	$ 101	$ 125	$ 142

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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