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Fair Value Measurements (Tables)
6 Months Ended
Jul. 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

     (97     (20

Unrealized gains (losses)

     28        (3
  

 

 

   

 

 

 

Balance at end of quarter

   $ 207      $ 297