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Long-term Investments (Tables)
 12 Months Ended
Jan. 29, 2011
Long-term Investments  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
                 
     2010     2009  
     (In Millions)  

Balance at beginning of year

    $ 320      $ 332   

Sales

      (42 )      (28 ) 

Unrealized gains / (losses)

      (2 )      16   
                  

Balance at end of year

    $ 276      $ 320