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	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012 Sales [Member] customers	Oct. 31, 2011 Sales [Member] customers	Oct. 31, 2012 Accounts Receivable [Member] customers	Jul. 31, 2012 Accounts Receivable [Member] customers	Oct. 31, 2012 Stock Compensation Plan [Member]	Oct. 31, 2011 Stock Compensation Plan [Member]
Numerator:
Net loss from continuing operations	$ (51)	$ (58)
Net income (loss) from discontinued operations	32	(6)
Net loss	$ (19)	$ (64)
Shares used in basic per share amounts:
Weighted average common shares outstanding (shares)	296	300
Shares used in diluted per share amounts:
Weighted average common shares outstanding (shares)	296	300
Dilutive common equivalent shares from stock options and restricted stock awards (shares)	0	0
Dilutive weighted average common shares outstanding (shares)	296	300
Basic and diluted net income per share:
Basic net loss per share from continuing operations (dollars per share)	$ (0.17)	$ (0.19)
Basic net income (loss) per share from discontinued operations (dollars per share)	$ 0.11	$ (0.02)
Basic net loss per share (dollars per share)	$ (0.06)	$ (0.21)
Diluted net loss per share from continuing operations (dollars per share)	$ (0.17)	$ (0.19)
Diluted net income (loss) per share from discontinued operations (dollars per share)	$ 0.11	$ (0.02)
Diluted net loss per share (dollars per share)	$ (0.06)	$ (0.21)
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	22	28
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect (shares)							3	3
Number of customers accounted for more than ten percent of concentration risk			0	0	0	0