Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2017	Jul. 31, 2016
Other Liabilities Disclosure [Abstract]
Executive deferred compensation plan liabilities	$ 83	$ 69
Reserve for promotional discounts and rebates	19	14
Reserve for product returns	7	7
Current portion of license fee payable	10	10
Current portion of deferred rent	6	6
Current portion of dividend payable	9	5
Interest payable	0	11
Other	44	39
Total other current liabilities	$ 178	$ 161