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Amortizable Intangible Assets
 3 Months Ended
Apr. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortizable Intangible Assets Amortizable Intangible Assets
The components of our amortizable intangible assets are as follows:
 April 26, 2020January 26, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
 (In millions)(In millions)
Acquisition-related intangible assets$231  $(195) $36  $195  $(192) $3  
Patents and licensed technology522  (478) 44  520  (474) 46  
Total intangible assets$753  $(673) $80  $715  $(666) $49  
Amortization expense associated with intangible assets was $7 million for both the first quarters of fiscal years 2021 and 2020. Future amortization expense related to the net carrying amount of intangible assets as of April 26, 2020 is estimated to be $20 million for the remainder of fiscal year 2021, $21 million in fiscal year 2022, $18 million in fiscal year 2023, $12 million in fiscal year 2024, $7 million in fiscal year 2025, and $2 million in fiscal year 2026 and thereafter.