Branch Assets and Liabilities Held For Sale (Details Textual) (USD $)	Jul. 31, 2012 Branches	Jun. 30, 2012	May 18, 2012 Branches	Dec. 31, 2011	Jul. 31, 2011 Branches
Branch Assets and Liabilities Held for Sale (Textual) [Abstract]
Agreement with First Niagara Bank to sell retail branches					195
Agreement includes the transfer in deposits			$ 10,300,000,000
Agreement includes the transfer of Loans			1,600,000,000
Related branch premises, for Percentage of premium of deposits		6.67%
Branch agreement premium Received		886,000,000
Branch agreement deferred premium received		209,000,000
Number of retail branch sold under agreement	53		138
After-tax gain upon closing of transaction, net of allocated non-deductible goodwill	26,000,000	71,000,000
Branch loan held for sale commercial		115,000,000		521,000,000
Branch loan held for sale residential mortgages		279,000,000		1,400,000,000
Branch loan held for sale credit card loans		94,000,000		416,000,000
Branch loan held for sale other consumer loans		$ 43,000,000		$ 161,000,000