Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (84)	$ (11)
Other comprehensive income (loss), net of income taxes:
Unrealized gains on available-for-sale debt securities	0	2
Unrealized gains on available-for-sale equity securities	0	(1)
Foreign currency translation gains (losses)	(5)	(2)
Total other comprehensive income (loss), net	(5)	(1)
Comprehensive loss	$ (89)	$ (12)