Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data in Thousands	Total USD ($)	Shares of Common Stock	Common Stock and Additional Paid In Capital USD ($)	Treasury Stock USD ($)	Accumulated Other Comprehensive Income USD ($)	Retained Earnings USD ($)
Beginning Balance at Jul. 31, 2009	$ 2,557		$ 2,547	$ (2,846)	$ 7	$ 2,849
Beginning Balance, shares at Jul. 31, 2009		322,766
Components of comprehensive net income:
Net income	622					622
Other comprehensive income, net of tax	4				4
Comprehensive net income	626
Issuance of common stock under employee stock plans	326		26	302		(2)
Issuance of common stock under employee stock plans, shares		13,808
Restricted stock units released, net of taxes	(20)		(24)	28		(24)
Restricted stock units released, net of taxes, shares		1,517
Stock repurchases under stock repurchase programs	(750)			(750)
Stock repurchases under stock repurchase programs, shares	24,600	(24,624)
Tax benefit from share-based compensation plans	23		23
Share-based compensation expense	99		99
Other	(3)		(3)
Ending Balance at Apr. 30, 2010	2,858		2,668	(3,266)	11	3,445
Ending Balance, shares at Apr. 30, 2010		313,467
Beginning Balance at Jul. 31, 2010	2,821		2,728	(3,315)	11	3,397
Beginning Balance, shares at Jul. 31, 2010		313,861
Components of comprehensive net income:
Net income	691					691
Other comprehensive income, net of tax	4				4
Comprehensive net income	695
Issuance of common stock under employee stock plans	288		30	258
Issuance of common stock under employee stock plans, shares		10,968
Restricted stock units released, net of taxes	(53)		(103)	50
Restricted stock units released, net of taxes, shares		2,101
Stock repurchases under stock repurchase programs	(1,110)			(1,110)
Stock repurchases under stock repurchase programs, shares	23,300	(23,349)
Tax benefit from share-based compensation plans	68		68
Share-based compensation expense	112		112
Ending Balance at Apr. 30, 2011	$ 2,821		$ 2,835	$ (4,117)	$ 15	$ 4,088
Ending Balance, shares at Apr. 30, 2011		303,581