Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Oct. 31, 2021	Jul. 31, 2021
Leases [Abstract]
Operating lease right-of-use assets	$ 405	$ 380
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Other current liabilities	$ 67	66
Operating lease liabilities	403	380
Total operating lease liabilities	$ 470	$ 446