Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total USD ($)	Shares of Common Stock [Member]	Common Stock and Additional Paid In Capital [Member] USD ($)	Treasury Stock [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	Retained Earnings [Member] USD ($)
Beginning Balance at Jul. 31, 2012	$ 2,744		$ 3,018	$ (4,911)	$ 25	$ 4,612
Beginning Balance, shares at Jul. 31, 2012		295,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income	878				4	874
Issuance of stock under employee stock plans, shares		6,274
Issuance of treasury stock under employee stock plans	185		20	165
Stock repurchases under stock repurchase programs, shares	(4,800)	(4,820)
Stock repurchases under stock repurchase programs	(292)			(292)
Cash dividends declared	(152)					(152)
Tax benefit from share-based compensation plans	65		65
Share-based compensation expense	142		142
Ending Balance at Apr. 30, 2013	3,570		3,245	(5,038)	29	5,334
Ending Balance, shares at Apr. 30, 2013		296,743
Beginning Balance at Jul. 31, 2013	3,531		3,201	(4,952)	20	5,262
Beginning Balance, shares at Jul. 31, 2013		299,503
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income	928				(8)	936
Issuance of stock under employee stock plans, shares		5,267
Issuance of treasury stock under employee stock plans	169		70	99
Stock repurchases under stock repurchase programs, shares	(20,500)	(20,507)
Stock repurchases under stock repurchase programs	(1,425)			(1,425)
Cash dividends declared	(165)					(165)
Tax benefit from share-based compensation plans	52		52
Share-based compensation expense	148		148
Ending Balance at Apr. 30, 2014	$ 3,238		$ 3,471	$ (6,278)	$ 12	$ 6,033
Ending Balance, shares at Apr. 30, 2014		284,263