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Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 25, 2019	Oct. 26, 2018	Oct. 25, 2019	Oct. 26, 2018
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,371	$ 1,517	$ 2,607	$ 2,991
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	771	913	1,415	1,788
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	442	485	779	960
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	329	428	636	828
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	254	236	504	465
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	346	368	688	738
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	286	303	570	606
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 60	$ 65	$ 118	$ 132

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+ References

No definition available.

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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.

+ References

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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