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Income Taxes - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Operating Loss Carryforwards [Line Items]      
Expense related to the Tax Act     $ 872
Undistributed earnings of certain foreign subsidiaries on which tax is not provided $ 6,500    
Unrecognized deferred income tax liability 681    
Gross income tax benefit attributable to tax incentives     $ 300
Gross income tax benefit attributable to tax incentives (in dollars per share)     $ 0.08
Unrecognized tax benefits that would affect the effective tax rate if realized 2,300    
Net interest expense, reduction related to unrecognized tax benefits 74 $ 104 $ 30
Increase in unrecognized tax benefits for prior year tax positions 618 554 84
Accrual for interest and penalties 444 340 $ 220
Unrecognized tax benefit that could be reduced in next 12 months 800    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 540    
Tax credit carryforward 31    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 1,100    
Tax credit carryforward 1,400    
Tax credit carryforward, valuation allowance 595    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 617    
Operating loss carryforwards, valuation allowance 104    
Tax credit carryforward $ 7    
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Income tax examination, benefit from settlement   102  
Internal Revenue Service (IRS) | Interest expense      
Operating Loss Carryforwards [Line Items]      
Income tax examination, benefit from settlement   $ 4