Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jul. 31, 2017
Long-Term Obligations [Abstract]
Total deferred rent	$ 47	$ 49
Long-term income tax liabilities	55	53
Total license fee payable	19	18
Total dividend payable	11	13
Long-term deferred income tax liabilities	7	7
Other	11	16
Total long-term obligations	150	156
Less current portion (included in other current liabilities)	(24)	(26)
Long-term obligations due after one year	$ 126	$ 130