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Nonperforming Assets (Parenthetical) (Detail) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Loans carried at fair value $ 449 $ 492
Residential Mortgage | Residential Mortgage Loans | Residential Nonguaranteed
   
Loans carried at fair value 23 24
Commercial Portfolio Segment
   
Loans carried at fair value 4 4
Commercial Portfolio Segment | Commercial and Industrial
   
Loans carried at fair value 4 4
Residential Mortgage Loans
   
Loans carried at fair value 445 488
Residential Mortgage Loans | Residential Nonguaranteed
   
Loans carried at fair value 445 488
Federal Housing Administration Loan
   
OREO $ 175 $ 195