Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended
	Jan. 31, 2014 Business_Unit	Jan. 31, 2013	Jan. 31, 2014 Business_Unit	Jan. 31, 2013	Jan. 31, 2014 Customer Concentration Risk [Member] customers	Jan. 31, 2013 Customer Concentration Risk [Member] customers	Jan. 31, 2014 Customer Concentration Risk [Member] Sales Revenue, Services, Net [Member] customers	Jan. 31, 2013 Customer Concentration Risk [Member] Sales Revenue, Services, Net [Member] customers	Jan. 31, 2014 Customer Concentration Risk [Member] Accounts Receivable [Member] customers	Jul. 31, 2013 Line of Credit [Member] Accounts Receivable [Member] customers
Composition of shares used in the computation of basic and diluted net income per share
Number of businesses discontinued	3		3
Numerator:
Net income (loss) from continuing operations	$ (37)	$ 65	$ (94)	$ 11
Net income from discontinued operations	0	6	46	41
Net income (loss)	$ (37)	$ 71	$ (48)	$ 52
Shares used in basic per share amounts:
Weighted average common shares outstanding	284	296	286	296
Shares used in diluted per share amounts:
Weighted average common shares outstanding	284	296	286	296
Dilutive common equivalent shares from stock options and restricted stock awards (shares)	0	7	0	6
Dilutive weighted average common shares outstanding	284	303	286	302
Basic and diluted net income (loss) per share:
Basic net income (loss) per share from continuing operations	$ (0.13)	$ 0.22	$ (0.33)	$ 0.04
Basic net income per share from discontinued operations	$ 0.00	$ 0.02	$ 0.16	$ 0.14
Basic net income (loss) per share	$ (0.13)	$ 0.24	$ (0.17)	$ 0.18
Diluted net income (loss) per share from continuing operations	$ (0.13)	$ 0.21	$ (0.33)	$ 0.04
Diluted net income per share from discontinued operations	$ 0.00	$ 0.02	$ 0.16	$ 0.13
Diluted net income (loss) per share	$ (0.13)	$ 0.23	$ (0.17)	$ 0.17
Weighted average stock options and restricted stock units that would have been included in the computation of dilutive common equivalent shares outstanding if net income had been reported in the period (shares)	19	0	17	0
Weighted average stock options and restricted stock units excluded from computation due to anti-dilutive effect (shares)	0	3	3	3
Concentration Risk, Number of Customers					0	0	0	0	1	0
Concentration Risk, Percentage									19.00%