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Fair Value Measurements (Tables)
9 Months Ended
Oct. 27, 2012
Fair Value Disclosures [Abstract]  
Long-Term Investments
The following table presents a rollforward of our long-term investments:
 
Nine Months Ended
 
October 27,
2012
 
October 29,
2011
 
(In Millions)
Balance at beginning of year
$
153

 
$
277

Sales
(68
)
 
(143
)
Unrealized gains
5

 
24

Balance at end of quarter
$
90

 
$
158