Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Dec. 31, 2017	Jan. 25, 2019	Jan. 26, 2018	Apr. 27, 2018
Income Tax Contingency [Line Items]
U.S. federal corporate tax rate			35.00%	21.00%
Discrete tax expense on deferred tax assets and liabilities		$ 117
Tax expense related to deferred tax assets for equity-based compensation awards		6			$ 6
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				$ 739
Reduction in provisional estimate due to TCJA	$ 5
Provision for income taxes	70	983		111	1,045
Gross unrecognized tax benefits	382			382
Gross unrecognized tax benefits included in other long-term liabilities	326			326		$ 314
Unrecognized tax benefits that would affect provision for income taxes	$ 308			308
Impact of ASC 606 Adoption | ASC 606
Income Tax Contingency [Line Items]
Provision for income taxes		$ (8)		$ (34)	$ (13)