Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018	Jan. 25, 2019	Jan. 26, 2018	Apr. 27, 2018
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, measurement period adjustment, net benefit	$ 12,000,000		$ 25,000,000
Cumulative income tax charge associated with the Tax Act			2,500,000,000
Tax Cuts and Jobs Act of 2017, total transition tax charge			2,400,000,000
Tax Cuts and Jobs Act of 2017, charge resulting from removal of permanent reinvestment assertion			118,000,000
Tax Cuts and Jobs Act of 2017, remeasure of deferred tax assets, liabilities, and valuation allowances, provisional tax benefit			$ 77,000,000
Effective tax rate	7.20%	235.50%	11.20%	58.70%
Certain tax adjustments	$ (64,000,000)	$ 2,200,000,000	$ (35,000,000)	$ 1,900,000,000
Benefit related to intercompany legal entity restructuring	32,000,000		32,000,000
Tax charge (benefit) related to tax effect from divestiture	(20,000,000)		(20,000,000)	37,000,000
Tax Cuts and Jobs Act of 2017, charge related to recognition of prepaid tax expense			42,000,000
Net charge associated with U.S. tax reform		$ 2,200,000,000		2,200,000,000
Tax benefit associated with intercompany sales of intellectual property				$ 398,000,000
Gross unrecognized tax benefits	1,800,000,000		1,800,000,000		$ 1,700,000,000
Accrued gross interest and penalties	192,000,000		192,000,000
Unrecognized tax benefits that would impact effective tax rate	$ 1,700,000,000		$ 1,700,000,000