Income Taxes - Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 3,603	$ 3,255	$ 7,260	$ 5,936
Provision for income taxes	$ 630	$ 710	$ 1,307	$ 1,217
Effective tax rate	17.50%	21.80%	18.00%	20.50%