Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2013 customers	Jul. 31, 2012	Jul. 31, 2011
Numerator:
Net income (loss) from continuing operations	$ (46)	$ (32)	$ 858	$ 65	$ (54)	$ 732	$ 119	$ (55)	$ 823	$ 764	$ 688
Net income (loss) from discontinued operations	30	36	(36)	6	35	2	(1)	(9)	35	28	(54)
Net income	(16)	4	822	71	(19)	734	118	(64)	858	792	634
Shares used in basic per share amounts:
Weighted average common shares outstanding									297	296	307
Shares used in diluted per share amounts:
Weighted average common shares outstanding									297	296	307
Dilutive common equivalent shares from stock options and restricted stock awards									6	9	10
Dilutive weighted average common shares outstanding									303	305	317
Basic and diluted net income per share:
Basic net income per share from continuing operations	$ (0.15)	$ (0.11)	$ 2.89	$ 0.22	$ (0.18)	$ 2.48	$ 0.40	$ (0.18)	$ 2.78	$ 2.58	$ 2.24
Basic net income (loss) per share from discontinued operations	$ 0.10	$ 0.12	$ (0.12)	$ 0.02	$ 0.12	$ 0.01	$ 0.00	$ (0.03)	$ 0.11	$ 0.09	$ (0.18)
Basic net income (loss) per share	$ (0.05)	$ 0.01	$ 2.77	$ 0.24	$ (0.06)	$ 2.49	$ 0.40	$ (0.21)	$ 2.89	$ 2.67	$ 2.06
Diluted net income (loss) per share from continuing operations	$ (0.15)	$ (0.11)	$ 2.83	$ 0.21	$ (0.18)	$ 2.41	$ 0.39	$ (0.18)	$ 2.72	$ 2.51	$ 2.17
Diluted net income (loss) per share from discontinued operations	$ 0.10	$ 0.12	$ (0.12)	$ 0.02	$ 0.12	$ 0.01	$ 0.00	$ (0.03)	$ 0.11	$ 0.09	$ (0.17)
Diluted net income (loss) per share	$ (0.05)	$ 0.01	$ 2.71	$ 0.23	$ (0.06)	$ 2.42	$ 0.39	$ (0.21)	$ 2.83	$ 2.60	$ 2.00
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect									3	3	0
Description of Business and Summary of Significant Accounting Policies (Textuals)
Technical support, estimated service period									1 year
Average time for amortization of Software									three to five
Advertising expense									$ 186	$ 150	$ 176
Estimated life of property and equipment									two to 30
Business combination, measurement period									1 year
Estimated life of purchased intangible assets									one to nine
Finite-lived intangible asset, useful life (in years)									7 years	7 years
Number of customers accounted for more than ten percent of concentration risk									0
Minimum [Member]
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)									1 year
Maximum [Member]
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 [Member] | Minimum [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									3 years
Software Development [Member] | Maximum [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Property, plant and equipment, useful life (in years)									5 years
Segment, Discontinued Operations [Member]
Description of Business and Summary of Significant Accounting Policies (Textuals)
Discontinued operating segments									3