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Cash Equivalents and Investments - Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions | Jul. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 1,983 | $ 2,473
Unrealized Gain | 0 | 0
Unrealized Loss | (10) | (24)
Estimated Fair Value | 1,973 | 2,449
Cash Equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 223 | 133
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 223 | 133
Cash Equivalents | Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 223 | 133
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 223 | 133
Short-term investments (Available-for-sale) |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 1,760 | 2,340
Unrealized Gain | 0 | 0
Unrealized Loss | (10) | (24)
Estimated Fair Value | 1,750 | 2,316
Short-term investments (Available-for-sale) | U.S. treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 1,730 | 2,207
Unrealized Gain | 0 | 0
Unrealized Loss | (10) | (22)
Estimated Fair Value | 1,720 | 2,185
Short-term investments (Available-for-sale) | Corporate debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 30 | 133
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | (2)
Estimated Fair Value | $ 30 | $ 131

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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