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Intangible Assets
 6 Months Ended
Jul. 31, 2016
Notes to financial statements [Abstract]  
Intangible Assets
Amortizable Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
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



Amortization expense associated with intangible assets was $18 million and $35 million for the three and six months ended July 31, 2016, respectively, and $19 million and $38 million for the three and six months ended July 26, 2015, respectively. Future amortization expense related to the net carrying amount of intangible assets as of July 31, 2016 is estimated to be $34 million for the remainder of fiscal year 2017, $54 million in fiscal year 2018, $26 million in fiscal year 2019, $16 million in fiscal year 2020, $7 million in fiscal year 2021 and a total of $1 million in fiscal year 2022 and beyond.