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Fair Value Measurements (Tables)
9 Months Ended
Oct. 29, 2011
Fair Value Measurements [Abstract]  
Financial Assets Measured At Fair Value On A Recurring Basis
     October 29, 2011      October 30, 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

   $ 91       $ 0       $ 91       $ 0       $ 96       $ 33       $ 63       $ 0   
Estimated Fair Values Of Company's Long-Term Debt
     October 29, 2011      October 30, 2010  
     Notional
Amount
     Carrying
Amount
     Fair
Value
     Notional
Amount
     Carrying
Amount
     Fair
Value
 
     (millions)  

Long-term debt

   $ 5,903       $ 6,124       $ 6,500       $ 6,707       $ 6,952       $ 7,085