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Intangible Assets
 3 Months Ended
Apr. 30, 2017
Notes to financial statements [Abstract]  
Intangible Assets
Amortizable Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
April 30, 2017
 
January 29, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
(In millions)
Acquisition-related intangible assets
$
193

 
$
(171
)
 
$
22

 
$
193

 
$
(167
)
 
$
26

Patents and licensed technology
469

 
(401
)
 
68

 
468

 
(390
)
 
78

Total intangible assets
$
662

 
$
(572
)
 
$
90

 
$
661

 
$
(557
)
 
$
104



Amortization expense associated with intangible assets was $15 million and $17 million for the first quarter of fiscal years 2018 and 2017, respectively. Future amortization expense related to the net carrying amount of intangible assets as of April 30, 2017 is estimated to be $40 million for the remainder of fiscal year 2018, $26 million in fiscal year 2019, $16 million in fiscal year 2020, $7 million in fiscal year 2021, and $1 million in fiscal year 2022 and beyond.