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Common Stock and Stockholders' Equity - PRSU's (Detail) - All Other Employees - Performance Based Restricted Stock Unit PRSU - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2019	Jan. 31, 2019
Vesting March 15 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)			0.5
Compensation related cost		$ 15
Vesting March 15 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)	0.5
Compensation related cost	$ 19	19
Unrecognized compensation cost - other than options	$ 94	$ 94
Unrecognized compensation cost recognized over weighted-average period	7 months

X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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