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Fair Value Measurements (Tables)
3 Months Ended
Apr. 28, 2012
Fair Value Measurements [Abstract]  
Fair Value, Assets Measured On Recurring Basis Using Unobservable Input
     Three Months Ended  
     April 28,
2012
    April 30,
2011
 
     (In Millions)  

Balance at beginning of year

   $ 153      $ 277   

Sales

     (1     (41

Unrealized gains

     4        14   
  

 

 

   

 

 

 

Balance at end of quarter

   $ 156      $ 250