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Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Oct. 27, 2019 | Jan. 27, 2019
--- | --- | ---
Assets |  |
Cash equivalents and marketable securities | $ 9,657 | $ 7,324
2.20% Notes Due 2021 |  |
Liabilities |  |
Stated interest rate | 2.20% |
3.20% Notes Due 2026 |  |
Liabilities |  |
Stated interest rate | 3.20% |
Debt securities issued by the United States Treasury |  |
Assets |  |
Cash equivalents and marketable securities | $ 5,883 | 1,492
Corporate debt securities |  |
Assets |  |
Cash equivalents and marketable securities | 1,293 | 2,620
Debt securities of United States government agencies |  |
Assets |  |
Cash equivalents and marketable securities | 1,204 | 2,280
Money market funds |  |
Assets |  |
Cash equivalents and marketable securities | 1,070 | 483
Foreign government debt securities |  |
Assets |  |
Cash equivalents and marketable securities | 178 | 209
Certificates of deposit |  |
Assets |  |
Cash equivalents and marketable securities | 25 |
Asset-backed securities |  |
Assets |  |
Cash equivalents and marketable securities | 4 | 151
Mortgage-backed securities issued by United States government-sponsored enterprises |  |
Assets |  |
Cash equivalents and marketable securities |  | 89
Fair Value, Inputs, Level 1 | Money market funds |  |
Assets |  |
Cash equivalents and marketable securities | 1,070 | 483
Fair Value, Inputs, Level 2 | 2.20% Notes Due 2021 |  |
Liabilities |  |
Notes | 1,003 | 978
Fair Value, Inputs, Level 2 | 3.20% Notes Due 2026 |  |
Liabilities |  |
Notes | 1,051 | 961
Fair Value, Inputs, Level 2 | Debt securities issued by the United States Treasury |  |
Assets |  |
Cash equivalents and marketable securities | 5,883 | 1,492
Fair Value, Inputs, Level 2 | Corporate debt securities |  |
Assets |  |
Cash equivalents and marketable securities | 1,293 | 2,620
Fair Value, Inputs, Level 2 | Debt securities of United States government agencies |  |
Assets |  |
Cash equivalents and marketable securities | 1,204 | 2,280
Fair Value, Inputs, Level 2 | Foreign government debt securities |  |
Assets |  |
Cash equivalents and marketable securities | 178 | 209
Fair Value, Inputs, Level 2 | Certificates of deposit |  |
Assets |  |
Cash equivalents and marketable securities | 25 | 0
Fair Value, Inputs, Level 2 | Asset-backed securities |  |
Assets |  |
Cash equivalents and marketable securities | 4 | 151
Fair Value, Inputs, Level 2 | Mortgage-backed securities issued by United States government-sponsored enterprises |  |
Assets |  |
Cash equivalents and marketable securities | $ 0 | $ 89

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- Definition Amount 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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