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 (Loss)	Retained Earnings
Beginning Balance at Jul. 31, 2011	$ 2,616	$ 3	$ 2,883	$ (4,316)	$ 15	$ 4,031
Beginning 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
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock under employee stock plans, shares		7,914
Stock repurchases under stock repurchase programs, shares		(22,467)
Comprehensive income	885				(22)	907
Issuance of treasury stock under employee stock plans	173		74	99		0
Stock repurchases under stock repurchase programs	(1,577)			(1,577)
Cash dividends declared	(220)					(220)
Tax benefit from share-based compensation plans	82		82
Share-based compensation expense	204		204
Ending Balance at Jul. 31, 2014	$ 3,078	$ 3	$ 3,558	$ (6,430)	$ (2)	$ 5,949
Ending Balance, shares at Jul. 31, 2014	284,950	284,950