Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	Jan. 31, 2019	Jul. 31, 2018
Long-Term Obligations [Abstract]
Total deferred rent	$ 49	$ 47
Long-term income tax liabilities	62	61
Total license fee payable	10	9
Total dividend payable	12	14
Other	15	15
Total long-term obligations	148	146
Less current portion (included in other current liabilities)	(24)	(27)
Long-term obligations due after one year	$ 124	$ 119