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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions	Oct. 26, 2018	Apr. 27, 2018
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 2,126	$ 2,738
Gross unrealized gains	0	1
Gross unrealized losses	(44)	(44)
Estimated fair value	2,082	2,695
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	1,614	1,865
Gross unrealized gains	0	1
Gross unrealized losses	(40)	(39)
Estimated fair value	1,574	1,827
U.S. Treasury and Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	362	497
Gross unrealized gains	0	0
Gross unrealized losses	(4)	(5)
Estimated fair value	358	492
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	0	230
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	0	230
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	116	115
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	116	115
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	34	31
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 34	$ 31

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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