Stock-based compensation expense is included in the condensed consolidated statements of operations as follows (in millions):

	Three Months Ended				Nine Months Ended
	January 25, 2019		January 26, 2018		January 25, 2019		January 26, 2018
Cost of product revenues	$	1	$	—	$	2	$	2
Cost of hardware maintenance and other services revenues		3		3		8		8
Sales and marketing		19		16		52		53
Research and development		13		11		37		38
General and administrative		7		8		22		24
Total stock-based compensation expense	$	43	$	38	$	121	$	125
Income tax benefit for stock-based compensation expense	$	1	$	5	$	11	$	23

Tabular disclosure of the shares withheld from the settlement of share-based awards when the employer settles employees' income tax withholding obligations. This represents the number of shares and the fair value of those shares withheld during the period.

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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