Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Numerator:
Net income from continuing operations	$ (102)	$ 656	$ (60)	$ (81)	$ (28)	$ 980	$ (42)	$ (57)	$ 413	$ 853	$ 807
Net income (loss) from discontinued operations	116	(155)	(6)	(3)	(1)	4	5	46	(48)	54	51
Net income	$ 14	$ 501	$ (66)	$ (84)	$ (29)	$ 984	$ (37)	$ (11)	$ 365	$ 907	$ 858
Shares used in basic per share amounts:
Weighted average common shares outstanding									281	285	297
Shares used in diluted per share amounts:
Weighted average common shares outstanding									281	285	297
Dilutive common equivalent shares from stock options and restricted stock awards									5	6	6
Dilutive weighted average common shares outstanding									286	291	303
Basic and diluted net income per share:
Basic net income per share from continuing operations	$ (0.37)	$ 2.37	$ (0.21)	$ (0.28)	$ (0.10)	$ 3.45	$ (0.15)	$ (0.20)	$ 1.47	$ 2.99	$ 2.72
Basic net income (loss) per share from discontinued operations	0.42	(0.56)	(0.02)	(0.01)	0.00	0.02	0.02	0.16	(0.17)	0.19	0.17
Basic net income per share	0.05	1.81	(0.23)	(0.29)	(0.10)	3.47	(0.13)	(0.04)	1.30	3.18	2.89
Diluted net income per share from continuing operations	(0.37)	2.33	(0.21)	(0.28)	(0.10)	3.38	(0.15)	(0.20)	1.45	2.94	2.66
Diluted net income (loss) per share from discontinued operations	0.42	(0.55)	(0.02)	(0.01)	0.00	0.01	0.02	0.16	(0.17)	0.18	0.17
Diluted net income per share	$ 0.05	$ 1.78	$ (0.23)	$ (0.29)	$ (0.10)	$ 3.39	$ (0.13)	$ (0.04)	$ 1.28	$ 3.12	$ 2.83
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect									2	0	3
Description of Business and Summary of Significant Accounting Policies (Textuals)
Period of revenue recognition for software product enhancements and connected services									3 years
Advertising expense									$ 229	$ 171	$ 182
Business combination, measurement period									1 year
Finite-lived intangible asset, useful life (in years)									5 years	6 years
Sales Revenue, Net
Description of Business and Summary of Significant Accounting Policies (Textuals)
Concentration Risk, Percentage									0.00%	0.00%	0.00%
Accounts Receivable
Description of Business and Summary of Significant Accounting Policies (Textuals)
Concentration Risk, Percentage									0.00%	0.00%
Minimum
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									2 years
Finite-lived intangible asset, useful life (in years)									2 years
Maximum
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									30 years
Finite-lived intangible asset, useful life (in years)									9 years
Software Development | Minimum
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									3 years
Software Development | Maximum
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									5 years