Derivative Instruments - Schedule of Notional Amounts of Derivatives Outstanding (Details) - USD ($) $ in Millions	Apr. 30, 2022	Jul. 31, 2021
Derivative [Line Items]
Derivatives	$ 7,190	$ 6,869
Foreign currency derivatives
Derivative [Line Items]
Derivatives	4,501	4,139
Interest rate derivatives
Derivative [Line Items]
Derivatives	2,000	2,000
Total return swaps—deferred compensation
Derivative [Line Items]
Derivatives	$ 689	$ 730