Income Taxes - Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 3,801	$ 3,591	$ 11,061	$ 9,527
Provision for income taxes	$ 757	$ 728	$ 2,064	$ 1,945
Effective tax rate	19.90%	20.30%	18.70%	20.40%