Leases - Supplemental cash flows (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 107	$ 104	$ 76
Right-of-use assets obtained in exchange for operating lease liabilities	$ 28	$ 238	$ 60