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Fair Value Measurements (Tables)
12 Months Ended
Jan. 28, 2012
Fair Value Measurements [Abstract]  
Fair Value, Assets Measured On Recurring Basis Using Unobservable Input
     2011     2010  
     (In Millions)  

Balance at beginning of year

   $ 277      $ 321   

Sales

     (145     (42

Unrealized gains / (losses)

     21        (2
  

 

 

   

 

 

 

Balance at end of year

   $ 153      $ 277