Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Net revenue:
Product	$ 299	$ 264	$ 596	$ 535
Service and other	717	659	1,198	1,101
Total net revenue	1,016	923	1,794	1,636
Cost of revenue:
Cost of product revenue	37	40	66	69
Cost of service and other revenue	166	153	317	284
Amortization of acquired technology	3	6	6	12
Selling and marketing	405	356	688	600
Research and development	243	205	489	418
General and administrative	140	120	266	237
Amortization of other acquired intangible assets	0	1	1	3
Total costs and expenses	994	881	1,833	1,623
Operating income (loss) from continuing operations	22	42	(39)	13
Interest expense	(11)	(9)	(20)	(16)
Interest and other income (expense), net	(1)	(5)	(3)	(9)
Income (loss) before income taxes	10	28	(62)	(12)
Income tax provision (benefit)	(3)	(1)	(45)	(10)
Net income (loss) from continuing operations	13	29	(17)	(2)
Net loss from discontinued operations	0	(5)	0	(5)
Net income (loss)	$ 13	$ 24	$ (17)	$ (7)
Earnings Per Share, Basic [Abstract]
Basic net income (loss) per share from continuing operations (in USD per share)	$ 0.05	$ 0.11	$ (0.07)	$ (0.01)
Basic net income (loss) per share from discontinued operations (in USD per share)	0	(0.02)	0	(0.02)
Basic net income (loss) per share (in USD per share)	$ 0.05	$ 0.09	$ (0.07)	$ (0.03)
Shares used in basic per share calculations	257	263	257	267
Earnings Per Share, Diluted [Abstract]
Diluted net income (loss) per share from continuing operations (in USD per share)	$ 0.05	$ 0.11	$ (0.07)	$ (0.01)
Diluted net income (loss) per share from discontinued operations (in USD per share)	0	(0.02)	0	(0.02)
Diluted net income (loss) per share (in USD per share)	$ 0.05	$ 0.09	$ (0.07)	$ (0.03)
Shares used in diluted per share calculations (in shares)	260	266	257	267
Dividends [Abstract]
Cash dividends declared per common share (in USD per share)	$ 0.34	$ 0.30	$ 0.68	$ 0.60