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Fair Value Measurements (Tables)
3 Months Ended
Apr. 30, 2011
Fair Value Measurements  
Financial Assets Measured at Fair Value on a Recurring Basis
    April 30, 2011     May 1, 2010  
          Fair Value Measurements           Fair Value Measurements  
    Total     Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
    Significant
Observable
Inputs
(Level 2)
    Significant
Unobservable
Inputs
(Level 3)
    Total     Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
    Significant
Observable
Inputs
(Level 2)
    Significant
Unobservable
Inputs
(Level 3)
 
    (millions)  

Marketable equity and debt securities

  $ 65      $ 0      $ 65      $ 0      $ 81      $ 30      $ 51      $ 0   
Estimated Fair Values of Company's Long-Term Debt
     April 30, 2011      May 1, 2010  
     Notional
Amount
     Carrying
Amount
     Fair
Value
     Notional
Amount
     Carrying
Amount
     Fair
Value
 
     (millions)  

Long-term debt

   $ 6,081       $ 6,314       $ 6,416       $ 7,209       $ 7,474       $ 7,372