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Amortizable Intangible Assets
 6 Months Ended
Jul. 29, 2018
Notes to financial statements [Abstract]  
Amortizable Intangible Assets
Amortizable Intangible Assets
The components of our amortizable intangible assets are as follows:
 
July 29, 2018
 
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

 
$
(184
)
 
$
11

 
$
195

 
$
(180
)
 
$
15

Patents and licensed technology
485

 
(445
)
 
40

 
469

 
(432
)
 
37

Total intangible assets
$
680

 
$
(629
)
 
$
51

 
$
664

 
$
(612
)
 
$
52


The increase in gross carrying amount of intangible assets is due to purchases of licensed technology during the first half of fiscal year 2019. Amortization expense associated with intangible assets was $6 million and $17 million for the second quarter and first half of fiscal year 2019, respectively, and $14 million and $29 million for the second quarter and first half of fiscal year 2018, respectively. Future amortization expense related to the net carrying amount of intangible assets as of July 29, 2018 is estimated to be $12 million for the remainder of fiscal year 2019, $20 million in fiscal year 2020, $11 million in fiscal year 2021, $4 million in fiscal year 2022, $3 million in fiscal year 2023, and $1 million in fiscal 2024.