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Cash Equivalents and Marketable Securities | 12 Months Ended
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Jan. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable Securities | Cash Equivalents and Marketable SecuritiesOur cash equivalents and marketable securities related to debt securities are classified as “available-for-sale” debt 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 |
Net realized gains and unrealized gains and losses were not significant for all periods presented. 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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