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Marketable Securities | 9 Months Ended
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Oct. 27, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 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 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 |
For the third quarter and first nine months of fiscal years 2020 and 2019, there were no other-than-temporary impairment losses and net realized gains were not significant. 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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