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Financial Instruments - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Jan. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Allowance for credit loss | $ 0 |  | $ 0
Write offs of accrued interest receivables | 0 | $ 0 |
Direct investments in privately held companies | $ 178,000,000 |  | $ 177,000,000

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