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Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Jan. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of cash equivalents and marketable securities | The following is a summary of cash equivalents and marketable securities as of January 31, 2021 and January 26, 2020:
| January 31, 2021
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value |  | Reported as
|  |  |  |  | Cash Equivalents |  | Marketable Securities
| (In millions)
Corporate debt securities | $ | 4,442 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 4,444 |  |  | $ | 234 |  |  | $ | 4,210 |
Debt securities issued by United States government agencies | 2,975 |  |  | 1 |  |  | — |  |  | 2,976 |  |  | 28 |  |  | 2,948 |
Debt securities issued by the United States Treasury | 2,846 |  |  | — |  |  | — |  |  | 2,846 |  |  | 25 |  |  | 2,821 |
Certificates of deposit | 705 |  |  | — |  |  | — |  |  | 705 |  |  | 37 |  |  | 668 |
Money market funds | 313 |  |  | — |  |  | — |  |  | 313 |  |  | 313 |  |  | — |
Foreign government bonds | 67 |  |  | — |  |  | — |  |  | 67 |  |  |  |  | 67 |
Total | $ | 11,348 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 11,351 |  |  | $ | 637 |  |  | $ | 10,714 |
| January 26, 2020
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value |  | Reported as
|  |  |  |  | Cash Equivalents |  | Marketable Securities
| (In millions)
Money market funds | $ | 7,507 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,507 |  |  | $ | 7,507 |  |  | $ | — |
Debt securities issued by the United States Treasury | 1,358 |  |  | — |  |  | — |  |  | 1,358 |  |  | 1,358 |  |  | — |
Debt securities issued by United States government agencies | 1,096 |  |  | — |  |  | — |  |  | 1,096 |  |  | 1,096 |  |  | — |
Corporate debt securities | 592 |  |  | — |  |  | — |  |  | 592 |  |  | 592 |  |  | — |
Foreign government bonds | 200 |  |  | — |  |  | — |  |  | 200 |  |  | 200 |  |  | — |
Certificates of deposit | 27 |  |  | — |  |  | — |  |  | 27 |  |  | 27 |  |  | — |
Asset-backed securities | 1 |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total | $ | 10,781 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,781 |  |  | $ | 10,780 |  |  | $ | 1 |
The amortized cost and estimated fair value of cash equivalents and marketable securities as of January 31, 2021 and January 26, 2020 are shown below by contractual maturity.
| January 31, 2021 |  | January 26, 2020
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
| (In millions)
Less than one year | $ | 10,782 |  |  | $ | 10,783 |  |  | $ | 10,781 |  |  | $ | 10,781 |
Due in 1 - 5 years | 566 |  |  | 568 |  |  | — |  |  | — |
Total | $ | 11,348 |  |  | $ | 11,351 |  |  | $ | 10,781 |  |  | $ | 10,781 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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