Revenue - Allowance for Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss at beginning of period	$ 114	$ 125	$ 109	$ 143
Provisions (benefits)	17	(15)	36	(1)
Recoveries (write-offs), net	(52)	(8)	(66)	(14)
Foreign exchange and other	(9)	0	(9)	(26)
Allowance for credit loss at end of period	$ 70	$ 102	$ 70	$ 102