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Loans and Loans Held for Sale (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2011
Mar. 31, 2011
Loans by category        
Commercial, financial and agricultural $ 16,441,000,000 $ 17,113,000,000 $ 16,883,000,000  
Commercial real estate:        
Commercial mortgage 9,502,000,000 9,971,000,000 8,069,000,000  
Construction 2,106,000,000 3,430,000,000 1,631,000,000  
Total commercial real estate loans 11,608,000,000 13,401,000,000 9,700,000,000  
Commercial lease financing 6,471,000,000 6,620,000,000 6,105,000,000  
Total commercial loans 34,520,000,000 37,134,000,000 32,688,000,000  
Residential - Prime Loans:        
Real estate - residential mortgage 1,844,000,000 1,846,000,000 1,838,000,000  
Home equity loans 10,180,000,000 10,528,000,000 10,026,000,000  
Total residential - prime loans 12,024,000,000 12,374,000,000 11,864,000,000  
Total consumer loans 15,587,000,000 16,200,000,000 15,152,000,000  
Total loans 50,107,000,000 53,334,000,000 47,840,000,000  
Loans Held For Sale        
Commercial, financial and agricultural 196,000,000 255,000,000 80,000,000  
Real estate - construction 35,000,000 112,000,000 39,000,000  
Commercial Lease Financing 8,000,000 16,000,000 6,000,000  
Total loans held for sale 467,000,000 699,000,000 381,000,000 426,000,000
Changes in loans held for sale        
Balance at beginning of the period 637,000,000 556,000,000 467,000,000 426,000,000
New originations 1,053,000,000 812,000,000 914,000,000  
Transfers from held to maturity, net   65,000,000 16,000,000  
Loan sales (1,174,000,000) (712,000,000) (1,039,000,000)  
Loan draws (payments), net (49,000,000) (16,000,000) 73,000,000  
Transfers to OREO / valuation adjustments   (6,000,000) (9,000,000)  
Balance at end of the period 467,000,000 699,000,000 381,000,000 426,000,000
Loans and Loans Held For Sale (Textuals) [Abstract]        
Loans held for sale 467,000,000 699,000,000 381,000,000 426,000,000
Key Community Bank [Member]
       
Residential - Prime Loans:        
Home equity loans 9,514,000,000 9,775,000,000 9,431,000,000  
Consumer other 1,167,000,000 1,147,000,000 1,157,000,000  
Corporate Banking [Member]
       
Residential - Prime Loans:        
Consumer other 2,396,000,000 2,679,000,000 2,131,000,000  
Corporate Banking [Member] | Marine loan [Member]
       
Residential - Prime Loans:        
Consumer other 2,234,000,000 2,491,000,000 1,989,000,000  
Corporate Banking [Member] | Other loan [Member]
       
Residential - Prime Loans:        
Consumer other 162,000,000 188,000,000 142,000,000  
Segment, Discontinued Operations [Member] | Education Lending [Member]
       
Residential - Prime Loans:        
Total loans 3,326,000,000 3,371,000,000 3,161,000,000  
Loans Held For Sale        
Total loans held for sale 15,000,000 92,000,000 0  
Changes in loans held for sale        
Balance at end of the period 15,000,000 92,000,000 0  
Loans and Loans Held For Sale (Textuals) [Abstract]        
Loans 6,500,000,000 6,600,000,000 6,300,000,000  
Loans held for sale 15,000,000 92,000,000 0  
Other loan [Member]
       
Residential - Prime Loans:        
Home equity loans 666,000,000 753,000,000 595,000,000  
Commercial Mortgage Backed Securities [Member]
       
Loans Held For Sale        
Real estate - residential mortgage 118,000,000 235,000,000 198,000,000  
Residential Mortgage [Member]
       
Loans Held For Sale        
Real estate - residential mortgage 110,000,000 81,000,000 58,000,000  
Segment, Discontinued Operations [Member]
       
Residential - Prime Loans:        
Total loans 3,326,000,000 3,371,000,000 3,161,000,000  
Loans Held For Sale        
Total loans held for sale 15,000,000 92,000,000 0  
Changes in loans held for sale        
Balance at end of the period 15,000,000 92,000,000 0  
Loans and Loans Held For Sale (Textuals) [Abstract]        
Loans held for sale $ 15,000,000 $ 92,000,000 $ 0