Income Taxes - Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 3,591	$ 3,444	$ 9,527	$ 10,664
Provision for income taxes	$ 728	$ 670	$ 1,945	$ 2,086
Effective tax rate	20.30%	19.40%	20.40%	19.60%