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Fair Value Measurements (Tables)
6 Months Ended
Jul. 30, 2011
Fair Value Measurements  
Financial Assets Measured At Fair Value On A Recurring Basis
    July 30, 2011     July 31, 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

  $ 73      $ 0      $ 73      $ 0      $ 95      $ 30      $ 65      $ 0   
Estimated Fair Values Of Company's Long-Term Debt
     July 30, 2011      July 31, 2010  
     Notional
Amount
     Carrying
Amount
     Fair
Value
     Notional
Amount
     Carrying
Amount
     Fair
Value
 
     (millions)  

Long-term debt

   $ 5,907       $ 6,134       $ 6,557       $ 7,207       $ 7,464       $ 7,324