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Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 26, 2018	Oct. 27, 2017	Oct. 26, 2018	Oct. 27, 2017
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,517	$ 1,415	$ 2,991	$ 2,736
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	913	819	1,788	1,546
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	649	566	1,261	1,064
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	264	253	527	482
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	236	224	465	447
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	368	372	738	743
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	303	306	606	604
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 65	$ 66	$ 132	$ 139

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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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