Income Taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - Deferred tax asset valuation allowance - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2022	Jul. 31, 2021	Jul. 25, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of fiscal year	$ 771	$ 700	$ 457
Additions	84	91	279
Deductions	(10)	(5)	(29)
Write-offs	(12)	(16)	(7)
Foreign exchange and other	1	1	0
Balance at end of fiscal year	$ 834	$ 771	$ 700