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Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2022
Investments, All Other Investments [Abstract] |  |  |
Securities in continuous unrealized loss position for greater than twelve months | $ 0 | $ 0 |
Allowance for credit loss | 0 | 0 |
Securities, writeoff | 0 | 0 |
Marketable debt securities | 764,000,000 | 450,000,000 | $ 38,000,000
Direct investments in privately held companies | $ 162,000,000 | $ 177,000,000 |

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