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Intangible Assets (Tables)
 6 Months Ended
Jul. 31, 2016
Notes to financial statements [Abstract]  
Amortizable Intangible Assets Components
 
July 31, 2016
 
January 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
(In millions)
Acquisition-related intangible assets
$
193

 
$
(160
)
 
$
33

 
$
193

 
$
(152
)
 
$
41

Patents and licensed technology
469

 
(364
)
 
105

 
462

 
(337
)
 
125

Total intangible assets
$
662

 
$
(524
)
 
$
138

 
$
655

 
$
(489
)
 
$
166