Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Jul. 26, 2019	Jul. 27, 2018	Apr. 26, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	10.20%	8.70%
Certain tax adjustments	$ (30)	$ (29)
Net benefit related to measurement period adjustment related to U.S. Tax Reform	30	50
Charge related to recognition of prepaid tax expense		$ 21
Gross unrecognized tax benefits	1,900		$ 1,800
Accrued gross interest and penalties	186
Unrecognized tax benefits that would impact effective tax rate	$ 1,800

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of reasonable estimate for income tax expense for which accounting for tax effect for remeasurement of deferred tax asset from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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