Condensed Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings
Beginning Balance at Jul. 31, 2008	$ 2,080	$ 3	$ 2,412	$ (2,786)	$ 7	$ 2,444
Beginning Balance, shares at Jul. 31, 2008		322,600
Components of comprehensive income:
Net income	447			0		447
Other comprehensive income, net of tax	0			0		0
Comprehensive net income	447
Issuance of common stock under employee stock plans	198			219		(21)
Issuance of common stock under employee stock plans, shares		10,107
Restricted stock units released, net of taxes	(15)		(15)	21		(21)
Restricted stock units released, net of taxes, shares		966
Stock repurchases under stock repurchase programs	(300)			(300)
Stock repurchases under stock repurchase programs, shares		(10,907)
Tax benefit from share-based compensation plans	18		18	0
Share-based compensation expense	133		133	0
Other	(4)		(4)	0
Ending Balance at Jul. 31, 2009	2,557	3	2,544	(2,846)	7	2,849
Ending Balance, shares at Jul. 31, 2009		322,766
Components of comprehensive income:
Net income	574					574
Other comprehensive income, net of tax	4				4
Comprehensive net income	578
Issuance of common stock under employee stock plans	440		38	402
Issuance of common stock under employee stock plans, shares		18,286
Restricted stock units released, net of taxes	(24)		(26)	28		(26)
Restricted stock units released, net of taxes, shares		1,554
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
Share-based compensation expense	135		135
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	313,861
Components of comprehensive income:
Net income	634					634
Other comprehensive income, net of tax	4				4
Comprehensive net income	638
Issuance of common stock under employee stock plans	338		31	307
Issuance of common stock under employee stock plans, shares		12,808
Restricted stock units released, net of taxes	(55)		(107)	52
Restricted stock units released, net of taxes, shares		2,162
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