Leases - Supplemental balance sheet (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Leases [Abstract]
Operating lease right-of-use assets	$ 411	$ 469
Other current liabilities	71	89
Operating lease liabilities	458	480
Total operating lease liabilities	$ 529	$ 569
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current