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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024 | Jan. 31, 2025
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Interest receivable | $ 62 |  | $ 62 |  | $ 53
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets |  | Prepaid expenses and other current assets |  | Prepaid expenses and other current assets
Net losses on non-marketable equity investments | $ 2 | $ 3 | $ 3 | $ 10 |

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