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Income Taxes - Breakdown Between Current and Noncurrent Net Deferred Tax Assets (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
Income Tax Disclosure [Abstract]    
Deferred tax assets $ 4,360 $ 3,990
Deferred tax liabilities (134) (81)
Total net deferred tax assets $ 4,226 $ 3,909