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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions	Apr. 28, 2017	Apr. 29, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 2,677	$ 2,613
Gross unrealized gains	4	7
Gross unrealized losses	(4)	(1)
Estimated fair value	2,677	2,619
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	1,535	1,370
Gross unrealized gains	3	5
Gross unrealized losses	(2)	(1)
Estimated fair value	1,536	1,374
U.S. Treasury and Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	629	878
Gross unrealized gains	1	2
Gross unrealized losses	(2)	0
Estimated fair value	628	880
Foreign Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	21	35
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	21	35
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	362	202
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	362	202
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	99	98
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	99	98
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	31	30
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 31	$ 30

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

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-Publisher FASB
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