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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 24, 2020
Jan. 25, 2019
Jan. 24, 2020
Jan. 25, 2019
Apr. 26, 2019
Income Tax Disclosure [Abstract]          
Effective tax rate (21.50%) 7.20% (8.20%) 11.20%  
Certain tax adjustments $ (558) $ (64) $ (839) $ (35)  
Benefit related to release of valuation allowance 558   558    
Net benefit related to measurement period adjustment related to U.S. Tax Reform   12 30 25  
Benefit related to tax legislative changes in Switzerland     251    
Finite-Lived Intangible Assets [Line Items]          
Benefit related to intercompany legal entity restructuring   32   32  
Net benefit associated with finalization of certain income tax aspects of divestiture   $ 20   20  
Charge related to recognition of prepaid tax expense       $ 42  
Gross unrecognized tax benefits 1,800   1,800   $ 1,800
Accrued gross interest and penalties 207   207    
Unrecognized tax benefits that would impact effective tax rate $ 1,800   $ 1,800    
Amortizable Asset Created for Swiss Federal Income Tax Purposes          
Finite-Lived Intangible Assets [Line Items]          
Period over which amortizable asset will be amortized and deducted     10 years