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Income Taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - Deferred tax asset valuation allowance - USD ($)
$ in Millions
 12 Months Ended
Jul. 29, 2023
Jul. 30, 2022
Jul. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of fiscal year $ 834 $ 771 $ 700
Additions 35 84 91
Deductions (18) (10) (5)
Write-offs (93) (12) (16)
Foreign exchange and other (4) 1 1
Balance at end of fiscal year $ 754 $ 834 $ 771