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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Jan. 31, 2022
Investments, All Other Investments [Abstract] |  |  |
Direct investments in privately held companies | $ 157,000,000 |  | $ 134,000,000
Equity method investment, realized gain (loss) on disposal | $ 0 | $ 8,000,000 |

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