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Cash Equivalents and Marketable Securities | 3 Months Ended
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Apr. 26, 2020
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable Securities | Cash Equivalents and Marketable Securities Our cash equivalents and marketable securities are classified as “available-for-sale” debt securities. The following is a summary of cash equivalents and marketable securities as of April 26, 2020 and January 26, 2020:
| April 26, 2020 |  |  |  |  |  |  |  |  |  |
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value |  | Reported as |  |
|  |  |  |  |  |  |  |  | Cash Equivalents |  | Marketable Securities
| (In millions) |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 11,128 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,128 |  |  | $ | 11,128 |  |  | $ | — |
Corporate debt securities | 3,238 |  |  | — |  |  | — |  |  | 3,238 |  |  | 2,951 |  |  | 287 |
Foreign government bonds | 870 |  |  | — |  |  | — |  |  | 870 |  |  | 870 |  |  | — |
Certificates of deposit | 582 |  |  | — |  |  | — |  |  | 582 |  |  | 222 |  |  | 360 |
Debt securities issued by United States government agencies | 381 |  |  | — |  |  | — |  |  | 381 |  |  | 168 |  |  | 213 |
Total | $ | 16,199 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,199 |  |  | $ | 15,339 |  |  | $ | 860 |
| 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 of $16.20 billion and $10.78 billion as of April 26, 2020 and January 26, 2020, respectively, are all related to contracts with maturities of less than one year. Unrealized gains and losses were not significant for all periods presented. For the first quarter of fiscal years 2021 and 2020, net realized gains were not significant.

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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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