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Stockholders' Equity - PRSU's (Details) - Non-Executive Employees - Performance Based Restricted Stock Unit PRSU - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2021 | Jan. 31, 2021
Vesting March 15 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Units granted (in shares) |  | 0.3 |
Share-based compensation expense | $ 24 | $ 35 |
Unrecognized compensation cost, other than options | $ 37 | $ 37 |
Unrecognized compensation cost recognized over weighted-average period |  | 5 months |
Vesting March 15 2021 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Units granted (in shares) |  |  | 0.6
Share-based compensation expense |  | $ 17 |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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