Other Current Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Other Liabilities, Current [Abstract]
Reserve for product returns	$ 41	$ 7
Reserve for rebates	34	14
Current portion of license fee payable	10	10
Current portion of deferred rent	6	6
Interest payable	1	11
Amounts due for share repurchases	5	0
Executive deferred compensation plan liabilities	80	69
Other	45	40
Total other current liabilities	$ 222	$ 157