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 (Loss)	56				4	52
Issuance of stock under employee stock plans, shares		4,814
Issuance of treasury stock under employee stock plans	141		16	125
Stock repurchases under stock repurchase programs, shares	(3,400)	(3,361)
Stock repurchases under stock repurchase programs	(200)			(200)
Cash dividends declared	(101)					(101)
Tax benefit from share-based compensation plans	56		56
Share-based compensation expense	96		96
Ending Balance at Jan. 31, 2013	2,792		3,186	(4,986)	29	4,563
Ending Balance, shares at Jan. 31, 2013		296,742
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 (Loss)	(58)				(10)	(48)
Issuance of stock under employee stock plans, shares		4,188
Issuance of treasury stock under employee stock plans	133		33	100
Stock repurchases under stock repurchase programs, shares	(20,200)	(20,178)
Stock repurchases under stock repurchase programs	(1,402)		0	(1,402)
Cash dividends declared	(111)					(111)
Tax benefit from share-based compensation plans	43		43
Share-based compensation expense	99		99
Ending Balance at Jan. 31, 2014	$ 2,235		$ 3,376	$ (6,254)	$ 10	$ 5,103
Ending Balance, shares at Jan. 31, 2014		283,513