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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023 | Jan. 31, 2024
Investments, All Other Investments [Abstract] |  |  |  |  |
Securities in continuous unrealized loss position for greater than twelve months | $ 0 |  | $ 0 |  | $ 0
Allowance for credit loss | 0 |  | 0 |  | 0
Write offs of accrued interest receivables |  |  | 0 | $ 0 |
Available-for-sale securities gross gains (losses) |  |  | 0 | 0 |
Direct investments in privately held companies | 160,000,000 |  | 160,000,000 |  | $ 162,000,000
Realized gains | $ 0 | $ 0 | $ 0 | $ 0 |

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