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, 2010	$ 2,821	$ 3	$ 2,725	$ (3,315)	$ 11	$ 3,397
Beginning Balance, shares at Jul. 31, 2010		313,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock under employee stock plans, shares		14,970
Stock repurchases under stock repurchase programs, shares		(28,234)
Comprehensive income	638			0	4	634
Issuance of treasury stock under employee stock plans	283		(76)	359		0
Stock repurchases under stock repurchase programs	(1,360)			(1,360)
Tax benefit from share-based compensation plans	81		81	0
Share-based compensation expense	153		153	0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock under employee stock plans, shares		11,556
Stock repurchases under stock repurchase programs, shares		(16,864)
Comprehensive income	802				10	792
Issuance of treasury stock under employee stock plans	164		(108)	305		(33)
Stock repurchases under stock repurchase programs	(900)			(900)
Cash dividends declared	(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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock under employee stock plans, shares		9,034
Stock repurchases under stock repurchase programs, shares		(4,820)
Comprehensive income	853				(5)	858
Issuance of treasury stock under employee stock plans	165		(81)	251		(5)
Stock repurchases under stock repurchase programs	(292)			(292)
Cash dividends declared	(203)					(203)
Tax benefit from share-based compensation plans	69		69
Share-based compensation expense	195		195
Ending Balance at Jul. 31, 2013	$ 3,531	$ 3	$ 3,198	$ (4,952)	$ 20	$ 5,262
Ending Balance, shares at Jul. 31, 2013	299,503	299,503