Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021	Jul. 31, 2021
Leases [Abstract]
Weighted-average remaining lease term (in years)	4 years 7 months 6 days		4 years 7 months 6 days		5 years 2 months 12 days
Weighted-average discount rate	1.80%		1.80%		1.70%
Sales-type lease terms, on average	4 years		4 years
Interest income, lease receivables	$ 13	$ 19	$ 42	$ 59
Operating lease income	$ 26	$ 36	$ 87	$ 119