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Amortizable Intangible Assets | 9 Months Ended
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Oct. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Amortizable Intangible Assets | Amortizable Intangible Assets The components of our amortizable intangible assets are as follows:
| October 27, 2019 |  | January 27, 2019
| 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 |  |  | $ | (191 | ) |  | $ | 4 |  |  | $ | 195 |  |  | $ | (188 | ) |  | $ | 7 |
Patents and licensed technology | 508 |  |  | (469 | ) |  | 39 |  |  | 491 |  |  | (453 | ) |  | 38 |
Total intangible assets | $ | 703 |  |  | $ | (660 | ) |  | $ | 43 |  |  | $ | 686 |  |  | $ | (641 | ) |  | $ | 45 |
The increase in gross carrying amount of intangible assets is due to purchases of licensed technology during the first nine months of fiscal year 2020. Amortization expense associated with intangible assets was $6 million and $19 million for the third quarter and first nine months of fiscal year 2020, respectively, and $7 million and $24 million for the third quarter and first nine months of fiscal year 2019, respectively. Future amortization expense related to the net carrying amount of intangible assets as of October 27, 2019 is estimated to be $6 million for the remainder of fiscal year 2020, $16 million in fiscal year 2021, $9 million in fiscal year 2022, $7 million in fiscal year 2023, and $5 million in fiscal year 2024.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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