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Fair Value Measurements (Tables)
3 Months Ended
Apr. 30, 2011
Fair Value Measurements  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input, Reconciliation
     2011     2010      
     (In Millions)    

Balance at beginning of year

     $ 276        $ 320     

Sales

     (41     (4  

Unrealized gains

     14        1     
                  

Balance at end of quarter

     $       249        $       317