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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023 | Jan. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Interest receivable | $ 48 |  | $ 48 |  | $ 35
Credit and non-credit losses on debt securities | 0 | $ 0 | 0 | $ 0 |
Proceeds of sale of debt securities | 48 | 24 | 115 | 42 |
Equity securities without readily determinable fair value, upward price adjustment, annual amount | 5 |  | 6 |  |
Impairment loss on non-marketable equity securities | 2 | 9 |  | 22 |
Loss upon exit and impairment loss |  |  | 13 |  |
Equity securities, unrealized loss |  | 4 |  | 2 |
Equity securities | $ 849 | 29 | $ 849 | 29 | $ 1,017
Proceeds from sale of available-for-sale securities, equity |  | $ 22 |  | $ 52 |

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