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Fair Value of Financial Assets and Liabilities (Tables) | 9 Months Ended
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Oct. 27, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring |
|  | Fair Value at
| Pricing Category |  | October 27, 2019 |  | January 27, 2019
|  |  | (In millions)
Assets |  |  |  |  |
Cash equivalents and marketable securities: |  |  |
Debt securities issued by the United States Treasury | Level 2 |  | $ | 5,883 |  |  | $ | 1,492 |
Corporate debt securities | Level 2 |  | $ | 1,293 |  |  | $ | 2,620 |
Debt securities of United States government agencies | Level 2 |  | $ | 1,204 |  |  | $ | 2,280 |
Money market funds | Level 1 |  | $ | 1,070 |  |  | $ | 483 |
Foreign government debt securities | Level 2 |  | $ | 178 |  |  | $ | 209 |
Certificates of deposit | Level 2 |  | $ | 25 |  |  | $ | — |
Asset-backed securities | Level 2 |  | $ | 4 |  |  | $ | 151 |
Mortgage-backed securities issued by United States government-sponsored enterprises | Level 2 |  | $ | — |  |  | $ | 89 |
Liabilities |  |  |  |  |
Other noncurrent liabilities: |  |  |  |  |
2.20% Notes Due 2021 (1) | Level 2 |  | $ | 1,003 |  |  | $ | 978 |
3.20% Notes Due 2026 (1) | Level 2 |  | $ | 1,051 |  |  | $ | 961 |
(1) These liabilities are carried on our Consolidated Balance Sheets at their original issuance value, net of unamortized debt discount and issuance costs, and are not marked to fair value each period. Refer to Note 12 of these Notes to Condensed Consolidated Financial Statements for additional information.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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