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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2022 | Jul. 31, 2021 | Jan. 31, 2022
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
Securities, writeoff |  |  | 0 | $ 0 |
Available-for-sale securities gross gains (losses) |  |  | 0 | 0 |
Direct investments in privately held companies | 173,000,000 |  | 173,000,000 |  | $ 134,000,000
Equity method investment, realized gain (loss) on disposal | $ 1,000,000 | $ 0 | $ 1,000,000 | $ 8,000,000 |

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