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		12 Months Ended
	Jan. 31, 2015 Business_unit	Jan. 31, 2014	Jan. 31, 2015 Business_unit	Jan. 31, 2014	Jul. 31, 2014 customers
Composition of shares used in the computation of basic and diluted net income per share
Number of businesses discontinued	2		2
Numerator:
Net loss from continuing operations	$ (66)	$ (37)	$ (150)	$ (94)
Net income from discontinued operations	0	0	0	46
Net loss	$ (66)	$ (37)	$ (150)	$ (48)
Shares used in basic per share amounts:
Weighted average common shares outstanding	285	284	285	286
Shares used in diluted per share amounts:
Weighted average common shares outstanding	285	284	285	286
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	0	0	0	0
Dilutive weighted average common shares outstanding	285	284	285	286
Basic and diluted net loss per share:
Basic net loss per share from continuing operations (in dollars per share)	$ (0.23)	$ (0.13)	$ (0.53)	$ (0.33)
Basic net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Basic net loss per share (in dollars per share)	$ (0.23)	$ (0.13)	$ (0.53)	$ (0.17)
Diluted net loss per share from continuing operations (in dollars per share)	$ (0.23)	$ (0.13)	$ (0.53)	$ (0.33)
Diluted net income per share from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.16
Diluted net loss per share (in dollars per share)	$ (0.23)	$ (0.13)	$ (0.53)	$ (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 (in shares)	14	19	15	17
Weighted average stock options and restricted stock units excluded from computation due to anti-dilutive effect (in shares)	2	0	2	3
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Basic and diluted net loss per share:
Concentration Risk, Number of Customers			0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Basic and diluted net loss per share:
Concentration Risk, Number of Customers			1		0
Concentration Risk, Percentage			18.00%