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Marketable Securities (Tables) | 9 Months Ended
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Oct. 27, 2019
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable Securities | The following is a summary of cash equivalents and marketable securities as of October 27, 2019 and January 27, 2019:
| October 27, 2019
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value |  | Reported as
|  |  |  |  | Cash Equivalents |  | Marketable Securities
| (In millions)
Debt securities issued by the United States Treasury | $ | 5,883 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,883 |  |  | $ | 5,883 |  |  | $ | — |
Corporate debt securities | 1,293 |  |  | — |  |  | — |  |  | 1,293 |  |  | 1,293 |  |  | — |
Debt securities of United States government agencies | 1,204 |  |  | — |  |  | — |  |  | 1,204 |  |  | 1,204 |  |  | — |
Money market funds | 1,070 |  |  | — |  |  | — |  |  | 1,070 |  |  | 1,070 |  |  | — |
Foreign government debt securities | 178 |  |  | — |  |  | — |  |  | 178 |  |  | 178 |  |  | — |
Certificates of deposit | 25 |  |  | — |  |  | — |  |  | 25 |  |  | 25 |  |  | — |
Asset-backed securities | 4 |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Total | $ | 9,657 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,657 |  |  | $ | 9,653 |  |  | $ | 4 |
| January 27, 2019
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value |  | Reported as
|  |  |  |  | Cash Equivalents |  | Marketable Securities
| (In millions)
Corporate debt securities | $ | 2,626 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 2,620 |  |  | $ | 25 |  |  | $ | 2,595 |
Debt securities of United States government agencies | 2,284 |  |  | — |  |  | (4 | ) |  | 2,280 |  |  | — |  |  | 2,280 |
Debt securities issued by the United States Treasury | 1,493 |  |  | — |  |  | (1 | ) |  | 1,492 |  |  | 176 |  |  | 1,316 |
Money market funds | 483 |  |  | — |  |  | — |  |  | 483 |  |  | 483 |  |  | — |
Foreign government debt securities | 209 |  |  | — |  |  | — |  |  | 209 |  |  | — |  |  | 209 |
Asset-backed securities | 152 |  |  | — |  |  | (1 | ) |  | 151 |  |  | — |  |  | 151 |
Mortgage-backed securities issued by United States government-sponsored enterprises | 88 |  |  | 1 |  |  | — |  |  | 89 |  |  | — |  |  | 89 |
Total | $ | 7,335 |  |  | $ | 1 |  |  | $ | (12 | ) |  | $ | 7,324 |  |  | $ | 684 |  |  | $ | 6,640 |
The amortized cost and estimated fair value of cash equivalents and marketable securities as of October 27, 2019 and January 27, 2019 are shown below by contractual maturity.
| October 27, 2019 |  | January 27, 2019
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
| (In millions)
Less than 1 year | $ | 9,657 |  |  | $ | 9,657 |  |  | $ | 5,042 |  |  | $ | 5,034 |
Due in 1 - 5 years | — |  |  | — |  |  | 2,271 |  |  | 2,268 |
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date | — |  |  | — |  |  | 22 |  |  | 22 |
Total | $ | 9,657 |  |  | $ | 9,657 |  |  | $ | 7,335 |  |  | $ | 7,324 |

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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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