Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning 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)
Ending Balance, shares at Jul. 31, 2013		299,503
Beginning Balance at Jul. 31, 2012	$ 2,744	$ 3	$ 3,015	$ (4,911)	$ 25	$ 4,612
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
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)
Ending Balance, shares at Jul. 31, 2014	284,950	284,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock under employee stock plans, shares		6,565
Stock repurchases under stock repurchase programs, shares		(13,809)
Ending Balance, shares at Jul. 31, 2015	277,706	277,706
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 337				(28)	365
Issuance of treasury stock under employee stock plans	107		107	0		0
Stock repurchases under stock repurchase programs	(1,245)			(1,245)
Cash dividends declared	(287)					(287)
Tax benefit from share-based compensation plans	85		85
Share-based compensation expense	257		257
Ending Balance at Jul. 31, 2015	$ 2,332	$ 3	$ 4,007	$ (7,675)	$ (30)	$ 6,027