Leases - Supplemental Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 52	$ 31
Right-of-use assets obtained in exchange for operating lease liabilities	$ 70	$ 27