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Common Stock and Stockholders' Equity - PRSU's (Detail) - All Other Employees - Performance Based Restricted Stock Unit PRSU shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2018 USD ($) shares	Oct. 31, 2018 USD ($) shares
Vesting March 15 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, number of Shares | shares		0.4
Compensation related cost		$ 7
Vesting March 15 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, number of Shares | shares	0.5
Compensation related cost	$ 20	29
Unrecognized compensation cost - other than options	$ 31	$ 31
Unrecognized compensation cost recognized over weighted-average period		5 months

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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