Leases - Lease expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 27, 2024	Jul. 29, 2023	Jul. 30, 2022
Leases [Abstract]
Operating lease expense	$ 420	$ 425	$ 390
Short-term lease expense	75	65	66
Variable lease expense	194	242	173
Total lease expense	$ 689	$ 732	$ 629