Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	Oct. 31, 2017	Jul. 31, 2017
Long-Term Obligations [Abstract]
Total deferred rent	$ 48	$ 49
Long-term income tax liabilities	54	53
Total license fee payable	18	18
Total dividend payable	9	13
Long-term deferred income tax liabilities	7	7
Other	15	16
Total long-term obligations	151	156
Less current portion (included in other current liabilities)	(23)	(26)
Long-term obligations due after one year	$ 128	$ 130