Revenue - Allowance for Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss at beginning of period	$ 70	$ 102	$ 109	$ 143
Provisions (benefits)	17	16	53	15
Recoveries (write-offs), net	(9)	(8)	(75)	(22)
Foreign exchange and other	0	0	(9)	(26)
Allowance for credit loss at end of period	$ 78	$ 110	$ 78	$ 110