Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	8 Months Ended	12 Months Ended
	Jan. 25, 2019	Dec. 31, 2017	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Income Tax Contingency [Line Items]
Tax benefit related to settlement and release of tax reserves			$ 48	$ 0	$ 0
U.S. federal corporate tax rate		35.00%	21.00%
Discrete tax expense on deferred tax assets and liabilities				108
Tax expense related to deferred tax assets for equity-based compensation awards	$ 6		$ 16	22
Percentage of transition tax on accumulated foreign earnings and profits, due to TCJA			15.50%
Percentage of transition tax on remaining foreign earnings due to TCJA			8.00%
Discrete tax expense for the estimated U.S. federal and state income tax impacts of the transition tax			$ (5)	732	0
Reduction in provisional estimate due to TCJA	$ 5
Global minimum tax expense for federal and state impacts			22	0	0
Provision for income taxes			99	1,083	140
Deferred tax assets, increase/decrease in valuation allowance			$ 14
Operating loss and credit carryforwards, expiration dates range, minimum			2020
Operating loss and credit carryforwards, expiration dates range, maximum			2038
Gross unrecognized tax benefits			$ 296	348	218	$ 216
Gross unrecognized tax benefits included in other long-term liabilities			252	314
Unrecognized tax benefits that would affect provision for income taxes			246
Provisional gross unrecognized tax benefits				114
Tax penalties and interest on unrecognized tax benefits			4	5	5
Accrued tax penalties and interest on unrecognized tax benefits			18	$ 22
State and Local Income Tax
Income Tax Contingency [Line Items]
Operating loss carry forwards			25
Tax credit carry forward amount			138
Foreign Income Tax
Income Tax Contingency [Line Items]
Operating loss carry forwards			4
Tax credit carry forward amount			$ 43
Staff Accounting Bulletin 118
Income Tax Contingency [Line Items]
Maximum measurement period due to TCJA			1 year
Accounting Standards Update 2016-09
Income Tax Contingency [Line Items]
Provision for income taxes					$ 18
Federal Income Tax
Income Tax Contingency [Line Items]
Tax benefit related to settlement and release of tax reserves			$ 48
Operating loss carry forwards			2
Tax credit carry forward amount			$ 3