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Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Jan. 26, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 11,348 | $ 10,781
Unrealized Gain | 3 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 11,351 | 10,781
Cash Equivalents | 637 | 10,780
Marketable Securities | 10,714 | 1
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,442 | 592
Unrealized Gain | 2 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,444 | 592
Cash Equivalents | 234 | 592
Marketable Securities | 4,210 | 0
Debt securities issued by United States government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,975 | 1,096
Unrealized Gain | 1 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 2,976 | 1,096
Cash Equivalents | 28 | 1,096
Marketable Securities | 2,948 | 0
Debt securities issued by the United States Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,846 | 1,358
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 2,846 | 1,358
Cash Equivalents | 25 | 1,358
Marketable Securities | 2,821 | 0
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 705 | 27
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 705 | 27
Cash Equivalents | 37 | 27
Marketable Securities | 668 | 0
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 313 | 7,507
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 313 | 7,507
Cash Equivalents | 313 | 7,507
Marketable Securities | 0 | 0
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 67 | 200
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 67 | 200
Cash Equivalents |  | 200
Marketable Securities | $ 67 | 0
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 1
Unrealized Gain |  | 0
Unrealized Loss |  | 0
Estimated Fair Value |  | 1
Cash Equivalents |  | 0
Marketable Securities |  | $ 1

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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