Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	1 Months Ended
	May 31, 2009	Jul. 31, 2018	Jul. 31, 2017
Long-Term Obligations and Commitments [Abstract]
Long-term income tax liabilities		$ 61	$ 53
Total deferred rent		47	49
Total license fee payable		9	18
Total dividend payable		14	13
Long-term deferred income tax liabilities		7	7
Other		12	16
Total long-term obligations		150	156
Less current portion (included in other current liabilities)		(27)	(26)
Long-term obligations due after one year		$ 123	$ 130
Long Term Obligations and Commitments (Textuals) [Abstract]
Cash paid to license technology	$ 20
Amount payable over next ten fiscal years for agreement to license technology	$ 100
Operating lease, term	10 years
Present value of license technology agreement	$ 89