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Cash Equivalents and Marketable Securities (Tables) | 3 Months Ended
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Apr. 26, 2020
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable 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 |

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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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