Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2021	Jul. 31, 2020
Other Liabilities, Current [Abstract]
Executive deferred compensation plan liabilities	$ 139	$ 123
Current portion of operating lease liabilities	72	46
Reserve for promotional discounts and rebates	30	11
Reserve for returns and credits	50	24
Current portion of dividend payable	6	6
Interest payable	1	3
Other	64	84
Total other current liabilities	$ 362	$ 297