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Intangible Assets (Tables)
 6 Months Ended
Jul. 26, 2015
Notes to financial statements [Abstract]  
Amortizable Intangible Assets Components
 
July 26, 2015
 
January 25, 2015
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net Carrying
Amount
 
(In millions)
Acquisition-related intangible assets
$
193

 
$
(143
)
 
$
50

 
$
189

 
$
(134
)
 
$
55

Patents and licensed technology
451

 
(311
)
 
140

 
449

 
(282
)
 
167

Total intangible assets
$
644

 
$
(454
)
 
$
190

 
$
638

 
$
(416
)
 
$
222