Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Net revenue:
Product	$ 264	$ 195	$ 535	$ 423
Service and other	659	554	1,101	938
Total net revenue	923	749	1,636	1,361
Cost of revenue:
Cost of product revenue	40	42	69	75
Cost of service and other revenue	153	139	284	258
Amortization of acquired technology	6	7	12	14
Selling and marketing	356	344	600	595
Research and development	205	188	418	377
General and administrative	120	115	237	234
Amortization of other acquired intangible assets	1	3	3	6
Total costs and expenses	881	838	1,623	1,559
Operating income (loss) from continuing operations	42	(89)	13	(198)
Interest expense	(9)	(7)	(16)	(14)
Interest and other income (expense), net	(5)	2	(9)	2
Income (loss) before income taxes	28	(94)	(12)	(210)
Income tax benefit	(1)	(34)	(10)	(69)
Net income (loss) from continuing operations	29	(60)	(2)	(141)
Net loss from discontinued operations	(5)	(6)	(5)	(9)
Net income (loss)	$ 24	$ (66)	$ (7)	$ (150)
Earnings Per Share, Basic [Abstract]
Basic net income per share from continuing operations (in USD per share)	$ 0.11	$ (0.21)	$ (0.01)	$ (0.50)
Basic net loss per share from discontinued operations (in USD per share)	(0.02)	(0.02)	(0.02)	(0.03)
Basic net income (loss) per share (in USD per share)	$ 0.09	$ (0.23)	$ (0.03)	$ (0.53)
Shares used in basic per share calculations (in shares)	263	285	267	285
Earnings Per Share, Diluted [Abstract]
Diluted net income (loss) per share from continuing operations (in USD per share)	$ 0.11	$ (0.21)	$ (0.01)	$ (0.50)
Diluted net loss per share from discontinued operations (in USD per share)	(0.02)	(0.02)	(0.02)	(0.03)
Diluted net income (loss) per share (in USD per share)	$ 0.09	$ (0.23)	$ (0.03)	$ (0.53)
Shares used in diluted per share calculations (in shares)	266	285	267	285
Dividends [Abstract]
Cash dividends declared per common share (in USD per share)	$ 0.30	$ 0.25	$ 0.6	$ 0.5