Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings
Beginning Balance at Jul. 31, 2009	$ 2,557	$ 3	$ 2,544	$ (2,846)	$ 7	$ 2,849
Beginning Balance, shares at Jul. 31, 2009		322,766
Components of comprehensive income:
Net income (loss)	574			0		574
Other comprehensive income, net of tax	4			0	4	0
Comprehensive net income	578
Issuance of treasury stock under employee stock plans	416		12	430		(26)
Issuance of treasury stock under employee stock plans, shares		19,840
Stock repurchases under stock repurchase programs	(900)			(900)
Stock repurchases under stock repurchase programs, shares		(28,745)
Tax benefit from share-based compensation plans	36		36	0
Share-based compensation expense	135		135	0
Other	(1)		(2)	1
Ending Balance at Jul. 31, 2010	2,821	3	2,725	(3,315)	11	3,397
Ending Balance, shares at Jul. 31, 2010		313,861
Components of comprehensive income:
Net income (loss)	634					634
Other comprehensive income, net of tax	4				4
Comprehensive net income	638
Issuance of treasury stock under employee stock plans	283		(76)	359
Issuance of treasury stock under employee stock plans, shares		14,970
Stock repurchases under stock repurchase programs	(1,360)			(1,360)
Stock repurchases under stock repurchase programs, shares		(28,234)
Tax benefit from share-based compensation plans	81		81
Share-based compensation expense	153		153
Ending Balance at Jul. 31, 2011	2,616	3	2,883	(4,316)	15	4,031
Ending Balance, shares at Jul. 31, 2011	300,597	300,597
Components of comprehensive income:
Net income (loss)	792					792
Other comprehensive income, net of tax	10				10
Comprehensive net income	802
Issuance of treasury stock under employee stock plans	164		(108)	305		(33)
Issuance of treasury stock under employee stock plans, shares		11,556
Stock repurchases under stock repurchase programs	(900)			(900)
Stock repurchases under stock repurchase programs, shares		(16,864)
Cash dividends declared ($0.60 per share)	(178)					(178)
Tax benefit from share-based compensation plans	71		71
Share-based compensation expense	169		169
Ending Balance at Jul. 31, 2012	$ 2,744	$ 3	$ 3,015	$ (4,911)	$ 25	$ 4,612
Ending Balance, shares at Jul. 31, 2012	295,289	295,289