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Intangible Assets
 12 Months Ended
Jan. 29, 2017
Notes to financial statements [Abstract]  
Intangible Assets
Amortizable Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
January 29, 2017
 
January 31, 2016
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Net 
Carrying
Amount
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Net 
Carrying
Amount
 
(In millions)
 
(In millions)
Acquisition-related intangible assets
$
193

 
$
(167
)
 
$
26

 
$
193

 
$
(152
)
 
$
41

Patents and licensed technology
468

 
(390
)
 
78

 
462

 
(337
)
 
125

Total intangible assets
$
661

 
$
(557
)
 
$
104

 
$
655

 
$
(489
)
 
$
166



Amortization expense associated with intangible assets for fiscal years 2017, 2016, and 2015 was $68 million, $73 million, and $77 million, respectively. Future amortization expense for the net carrying amount of intangible assets as of January 29, 2017 is estimated to be $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 $1 million in fiscal year 2022 until fully amortized.