Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions	Jul. 31, 2020	Apr. 24, 2020
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 290	$ 414
Gross unrealized gains	3	1
Gross unrealized losses	0	0
Estimated fair value	293	415
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	111	155
Gross unrealized gains	2	1
Gross unrealized losses	0	0
Estimated fair value	113	156
U.S. Treasury and Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	26	68
Gross unrealized gains	1	0
Gross unrealized losses	0	0
Estimated fair value	27	68
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	116	158
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	116	158
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	37	33
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 37	$ 33