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Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class (Parenthetical) (Detail) (Residential Mortgage, USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Residential Mortgage
     
Portfolio loans and leases at fair value $ 76 $ 65 $ 62