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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022 | Jan. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Fair value of debt securities in an unrealized loss position | $ 4,300 |  | $ 4,300 |  | $ 3,100
Credit and non-credit losses on debt securities | 0 | $ 0 | 0 | $ 0 |
Proceeds of sale of debt securities | 24 | 20 | 42 | 48 |
Impairment loss on non-marketable equity securities | 9 | 2 | 22 | 10 |
Upward price adjustment to non-marketable equity investments |  | 2 |  | 8 |
Gain (loss) on non-marketable equity securities |  | 4 |  | (2) |
Proceeds from sale of available-for-sale securities, equity | 22 | 0 | 52 | 5 |
Equity securities, unrealized loss | $ 4 | 0 | $ 2 | $ 17 |
Equity securities, unrealized gain |  | $ 0 |  |  |

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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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