Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 31, 2020
Other Liabilities Disclosure [Abstract]
Executive deferred compensation plan liabilities	$ 153	$ 123
Current portion of operating lease liabilities	66	46
Reserve for returns and credits	21	24
Amounts due for share repurchases	17	0
Reserve for promotional discounts and rebates	10	11
Current portion of dividend payable	9	6
Interest payable	1	3
Other	84	84
Total other current liabilities	$ 361	$ 297