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Amortizable Intangible Assets
 12 Months Ended
Jan. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortizable Intangible Assets
Amortizable Intangible Assets
The components of our amortizable intangible assets are as follows:
 
January 27, 2019
 
January 28, 2018
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Net 
Carrying
Amount
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Net 
Carrying
Amount
 
(In millions)
 
(In millions)
Acquisition-related intangible assets
$
195

 
$
(188
)
 
$
7

 
$
195

 
$
(180
)
 
$
15

Patents and licensed technology
491

 
(453
)
 
38

 
469

 
(432
)
 
37

Total intangible assets
$
686

 
$
(641
)
 
$
45

 
$
664

 
$
(612
)
 
$
52


The increase in gross carrying amount of intangible assets is due to purchases of licensed technology during fiscal year 2019. Amortization expense associated with intangible assets for fiscal years 2019, 2018, and 2017 was $29 million, $55 million, and $68 million, respectively. Future amortization expense related to the net carrying amount of intangible assets as of January 27, 2019 is estimated to be $21 million in fiscal year 2020, $12 million in fiscal year 2021, $5 million in fiscal year 2022, and $5 million in fiscal year 2023, and $2 million in fiscal year 2024.