Long-Term Obligations and Commitments - Other Long-Term Obligations (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 31, 2009	Jul. 31, 2019	Jul. 31, 2018
Long-Term Obligations and Commitments [Abstract]
Long-term income tax liabilities		$ 89	$ 61
Total deferred rent		47	47
Total license fee payable		0	9
Total dividend payable		11	14
Other		12	15
Total long-term obligations		159	146
Less current portion (included in other current liabilities)		(14)	(27)
Long-term obligations due after one year		145	$ 119
Long Term Obligations and Commitments (Textuals) [Abstract]
Cash paid to license technology	$ 20	$ 10
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