Income Taxes - Income Before Provision For Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019	Jul. 28, 2018
Income Tax Disclosure [Abstract]
United States	$ 7,534	$ 7,611	$ 3,765
International	6,436	6,960	9,274
INCOME BEFORE PROVISION FOR INCOME TAXES	$ 13,970	$ 14,571	$ 13,039