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Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,404	$ 1,563	$ 4,011	$ 4,554
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	787	967	2,202	2,755
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	483	517	1,262	1,477
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	304	450	940	1,278
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	263	239	767	704
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	354	357	1,042	1,095
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	293	292	863	898
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 61	$ 65	$ 179	$ 197

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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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