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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 30, 2020 | Oct. 25, 2019 | Oct. 30, 2020 | Oct. 25, 2019 | Apr. 24, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 5.90% | (6.00%) | 11.20% | 1.00% |
Certain tax adjustments, provision (benefit) | $ 16 | $ (251) | $ 20 | $ (281) |
Benefit associated with finalization of intercompany sale of intellectual property and establishment of deferred tax asset |  |  | 3 |  |
Recognition of previously deferred tax benefit from intercompany intellectual property transactions | 1,500 |  | $ 1,500 |  |
Deferred tax asset amortization period |  |  | 20 years |  |
Cost associated with amortization of previously established deferred tax assets from intercompany intellectual property transactions | 16 |  | $ 23 |  |
Benefit related to tax legislative changes in Switzerland |  | $ 251 |  | 251 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Net benefit related to measurement period adjustment related to U.S. Tax Reform |  |  |  | $ 30 |
Gross unrecognized tax benefits | 1,900 |  | 1,900 |  | $ 1,900
Accrued gross interest and penalties | 251 |  | 251 |  |
Unrecognized tax benefits that would impact effective tax rate | 1,800 |  | 1,800 |  |
Gross unrecognized tax benefits recorded as noncurrent liability | $ 940 |  | $ 940 |  | $ 911
Amortizable Asset Created for Swiss Federal Income Tax Purposes |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Period over which amortization asset will be amortized and deducted |  | 10 years |  | 10 years |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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