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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions	Apr. 24, 2020	Apr. 26, 2019
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 414	$ 1,725
Gross unrealized gains	1	2
Gross unrealized losses	0	(9)
Estimated fair value	415	1,718
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	155	1,359
Gross unrealized gains	1	2
Gross unrealized losses	0	(8)
Estimated fair value	156	1,353
U.S. Treasury and Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	68	214
Gross unrealized gains	0	0
Gross unrealized losses	0	(1)
Estimated fair value	68	213
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	158	117
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	158	117
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	33	35
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 33	$ 35

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