Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Net revenue:
Product	$ 447	$ 735	$ 878	$ 1,251
Service and other	1,747	1,653	2,796	2,541
Total net revenue	2,194	2,388	3,674	3,792
Cost of revenue:
Cost of product revenue	35	34	113	108
Cost of service and other revenue	173	130	457	363
Amortization of acquired technology	11	6	30	18
Selling and marketing	448	412	1,105	1,022
Research and development	217	186	617	548
General and administrative	135	121	377	348
Amortization of other acquired intangible assets	6	5	18	14
Goodwill impairment charge	263	0	263	0
Total costs and expenses	1,288	894	2,980	2,421
Operating income from continuing operations	906	1,494	694	1,371
Interest expense	(7)	(8)	(21)	(24)
Interest and other income, net	1	3	3	8
Income before income taxes	900	1,489	676	1,355
Income tax provision	399	505	325	465
Net income from continuing operations	501	984	351	890
Net income from discontinued operations	0	0	0	46
Net income	$ 501	$ 984	$ 351	$ 936
Earnings Per Share, Basic [Abstract]
Basic net income per share from continuing operations (in dollars per share)	$ 1.81	$ 3.47	$ 1.24	$ 3.12
Basic net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Basic net income per share (in dollars per share)	$ 1.81	$ 3.47	$ 1.24	$ 3.28
Shares used in basic per share calculations (in shares)	277	284	282	285
Earnings Per Share, Diluted [Abstract]
Diluted net income per share from continuing operations (in dollars per share)	$ 1.78	$ 3.39	$ 1.22	$ 3.06
Diluted net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Diluted net income per share (in dollars per share)	$ 1.78	$ 3.39	$ 1.22	$ 3.22
Shares used in diluted per share calculations (in shares)	282	290	288	291
Dividends [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.19	$ 0.75	$ 0.57