Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data	Total	Common Stock and Additional Paid In Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings	Common Stock [Member]
Beginning Balance at Jul. 31, 2010	$ 2,821	$ 2,728	$ (3,315)	$ 11	$ 3,397
Beginning Balance, shares at Jul. 31, 2010						313,861,000
Net loss	(70)	0	0	0	(70)	0
Other comprehensive income (loss), net of tax	1	0	0	1	0	0
Comprehensive net loss	(69)
Issuance of common stock under employee stock plans	126	(33)	159	0	0
Issuance of common stock under employee stock plans, shares						7,049,000
Stock repurchases under stock repurchase programs	(330)	0	(330)	0	0
Stock repurchases under stock repurchase programs, shares	7,300,000					(7,308,000)
Tax benefit from share-based compensation plans	32	32	0	0	0	0
Share-based compensation expense	35	35	0	0	0	0
Ending Balance at Oct. 31, 2010	2,615	2,762	(3,486)	12	3,327
Ending Balance, shares at Oct. 31, 2010						313,602,000
Beginning Balance at Jul. 31, 2011	2,616	2,886	(4,316)	15	4,031
Beginning Balance, shares at Jul. 31, 2011						300,597,000
Net loss	(64)	0	0	0	(64)	0
Other comprehensive income (loss), net of tax	(6)	0	0	(6)	0	0
Comprehensive net loss	(70)
Issuance of common stock under employee stock plans	45	(37)	87	0	(5)
Issuance of common stock under employee stock plans, shares						3,219,000
Stock repurchases under stock repurchase programs	(255)	0	(255)	0	0
Cash dividends declared ($0.15 per share)	(45)				(45)
Stock repurchases under stock repurchase programs, shares	5,200,000					(5,211,000)
Tax benefit from share-based compensation plans	30	30	0	0	0	0
Share-based compensation expense	40	40	0	0	0	0
Ending Balance at Oct. 31, 2011	$ 2,361	$ 2,919	$ (4,484)	$ 9	$ 3,917
Ending Balance, shares at Oct. 31, 2011						298,605,000