Leases - Supplemental balance sheet (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021
Leases [Abstract]
Operating lease right-of-use assets	$ 549	$ 380
Other current liabilities	84	66
Operating lease liabilities	542	380
Total operating lease liabilities	$ 626	$ 446
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current