Leases - Lease Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021
Leases [Abstract]
Operating lease expense	$ 98	$ 103	$ 193	$ 201
Short-term lease expense	15	17	32	35
Variable lease expense	41	43	90	89
Total lease expense	$ 154	$ 163	$ 315	$ 325