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Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Jan. 25, 2019	Jan. 26, 2018
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,563	$ 1,539	$ 4,554	$ 4,275
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	967	952	2,755	2,498
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	674	657	1,935	1,721
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	293	295	820	777
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	239	221	704	668
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	357	366	1,095	1,109
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	292	300	898	904
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 65	$ 66	$ 197	$ 205

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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