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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 | Apr. 30, 2026 | Jan. 31, 2026
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | $ 534 | $ 670
Total short-term investments | 1,827 | 1,695
Total | 2,361 | 2,365
U.S. government securities | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 1,626 | 1,459
Corporate debt securities (Level 2) | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 155 | 180
Certificates of deposit (Level 2) | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 46 | 56
Money market funds | Level 1 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | 505 | 654
Certificates of deposit (Level 2) | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | 19 | 0
U.S. government securities | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | 0 | 16
Corporate debt securities (Level 2) | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | $ 10 | $ 0

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