Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Oct. 25, 2019
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,416	$ 1,371	$ 2,719	$ 2,607
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	749	771	1,376	1,415
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	303	254	604	504
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	364	346	739	688
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	296	286	603	570
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 68	$ 60	$ 136	$ 118

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration