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Restructuring Charges - Activities Related to Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			$ 19	$ 6
Net charges	$ 0	$ 0	21	19
Cash payments			(34)	(20)
Other			(4)	0
Balance at end of period	2	5	2	5
May 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			0
Net charges			21
Cash payments			(20)
Other			0
Balance at end of period	1		1
April 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			15
Net charges			0
Cash payments			(14)
Other			0
Balance at end of period	1		1
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			4	6
Net charges			0	0
Cash payments			0	(2)
Other			(4)	0
Balance at end of period	$ 0	4	$ 0	4
May 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period				0
Net charges				19
Cash payments				(18)
Other				0
Balance at end of period		$ 1		$ 1

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585

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X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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X

- Definition

Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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