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Restructuring Charges - Activities Related to Restructuring Reserves (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 6	$ 13	$ 45
Net charges	35	0	52
Cash payments	(22)	(7)	(84)
Balance at end of period	19	6	13
April 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	0	0
Net charges	16	0	0
Cash payments	(1)	0	0
Balance at end of period	15	0	0
May 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	0	0
Net charges	19	0	0
Cash payments	(19)	0	0
Balance at end of period	0	0	0
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	6	13	0
Net charges	0	0	52
Cash payments	(2)	(7)	(39)
Balance at end of period	4	6	13
March 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	0	45
Net charges	0	0	0
Cash payments	0	0	(45)
Balance at end of period	$ 0	$ 0	$ 0

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=109223946&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
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

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-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
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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