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Branch Assets and Liabilities Held for Sale - Assets and Liabilities Held for Sale for Certain Retail Branches (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets Held For Sale [Line Items]    
Loans held for sale    $ 2,495
Properties and equipment, net    42
Goodwill allocated to retail branch disposal group    398
Total other branch assets held for sale    440
Total branch assets held for sale    2,935
Deposits held for sale    15,144
Other branch liabilities held for sale    11
Total branch liabilities held for sale    $ 15,155