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Premises and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment, Net [Abstract]    
Land $ 525 $ 516
Buildings and improvements 3,144 3,073
Furniture, fixtures and equipment 2,449 2,791
Capitalized building and equipment leases 95 88
Construction in progress 44 50
Premises and equipment, gross 6,257 6,518
Less accumulated depreciation and amortization (3,600) (4,031)
Total $ 2,657 $ 2,487