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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 | Oct. 31, 2025 | Jan. 31, 2025
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | $ 422 | $ 248
Total short-term investments | 1,818 | 2,114
Total | 2,240 | 2,362
U.S. treasury securities | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 1,517 | 1,788
Corporate debt securities | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 239 | 281
Certificates of deposit | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total short-term investments | 62 | 45
Money market funds | Level 1 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | 422 | 225
Certificates of deposit | Level 2 |  |
Cash and Cash Equivalents [Line Items] |  |
Total cash equivalents | $ 0 | $ 23

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