Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	Oct. 31, 2018	Jul. 31, 2018
Long-Term Obligations [Abstract]
Total deferred rent	$ 48	$ 47
Long-term income tax liabilities	61	61
Total license fee payable	10	9
Total dividend payable	10	14
Other	14	15
Total long-term obligations	143	146
Less current portion (included in other current liabilities)	(23)	(27)
Long-term obligations due after one year		184
Other long-term obligations	$ 120	$ 119