Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (31)	$ (84)
Other comprehensive loss, net of income taxes:
Foreign currency translation losses	(2)	(5)
Total other comprehensive income (loss), net	(2)	(5)
Comprehensive loss	$ (33)	$ (89)