Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Income Tax Contingency [Line Items]
Deferred tax assets, increase/decrease in valuation allowance	$ 1	$ 8
Operating loss and credit carryforwards, expiration dates range, minimum	2018
Operating loss and credit carryforwards, expiration dates range, maximum	2036
Gross unrecognized tax benefits	$ 216	272	$ 236	$ 190
Unrecognized tax benefits included in other long-term liabilities	164
Unrecognized tax benefits that would affect provision for income taxes	147
Tax penalties and interest on unrecognized tax benefits	2	4	2
Accrued tax penalties and interest on unrecognized tax benefits	11	9
Resolution of income tax examinations	20	46	0
Accumulated unremitted earnings from foreign subsidiaries	4,000
Estimated unrecognized deferred tax liability on unremitted earnings of foreign subsidiaries	1,000
Federal Income Tax
Income Tax Contingency [Line Items]
Operating loss carry forwards	15
Tax credit carry forward amount	40
Resolution of income tax examinations	23	47
Germany
Income Tax Contingency [Line Items]
Resolution of income tax examinations	(2)
State and Local Income Tax
Income Tax Contingency [Line Items]
Operating loss carry forwards	31
Tax credit carry forward amount	131
Foreign Income Tax
Income Tax Contingency [Line Items]
Tax credit carry forward amount	22
Additional Paid-in Capital
Income Tax Contingency [Line Items]
Unrecognized tax benefits	41
SolidFire
Income Tax Contingency [Line Items]
Tax charge from integration of intellectual properties from the SolidFire acquisition	$ 64	$ 0	$ 0