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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