Leases - Supplemental balance sheet (Details) - USD ($) $ in Millions	Jul. 31, 2023	Jul. 31, 2022
Leases [Abstract]
Operating lease right-of-use assets	$ 469	$ 549
Other current liabilities	89	84
Operating lease liabilities	480	542
Total operating lease liabilities	$ 569	$ 626
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current