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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions	Jul. 29, 2016	Apr. 29, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 2,323	$ 2,613
Gross unrealized gains	9	7
Gross unrealized losses	0	(1)
Estimated fair value	2,332	2,619
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	1,251	1,370
Gross unrealized gains	7	5
Gross unrealized losses	0	(1)
Estimated fair value	1,258	1,374
U.S. Treasury and Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	634	878
Gross unrealized gains	2	2
Gross unrealized losses	0	0
Estimated fair value	636	880
Foreign Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	32	35
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	32	35
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	266	202
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	266	202
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	108	98
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	108	98
Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	32	30
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 32	$ 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
-Name Accounting Standards Codification
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