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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	6 Months Ended	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2021	Jan. 31, 2021
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
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	$ 11	11
Unrecognized compensation cost, other than options	$ 56	$ 56
Unrecognized compensation cost recognized over weighted-average period		7 months

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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).

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