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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions | Jan. 31, 2025 | Jan. 31, 2024
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Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | $ 2,362 | $ 2,019
Cash and cash equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 248 | 151
Cash and cash equivalents | Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 225 | 151
Cash and cash equivalents | Certificates of Deposit |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 23 | 0
Short-term investments (Available-for-sale) |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 2,114 | 1,868
Short-term investments (Available-for-sale) | U.S. treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 1,788 | 1,784
Short-term investments (Available-for-sale) | Corporate debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | 281 | 43
Short-term investments (Available-for-sale) | Certificates of Deposit |  |
Cash and Cash Equivalents [Line Items] |  |
Estimated fair value | $ 45 | $ 41

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- Definition Amount excluding accrued interest, 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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