Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning Balance, shares at Jul. 31, 2013		299,503,000
Beginning Balance at Jul. 31, 2013	$ 3,531	$ 3	$ 3,198	$ (4,952)	$ 20	$ 5,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	885				(22)	907
Issuance of treasury stock under employee stock plans, shares		7,914,000
Issuance of stock under employee stock plans	173		74	99
Stock repurchases under stock repurchase programs, shares		(22,467,000)
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, shares at Jul. 31, 2014		284,950,000
Ending Balance at Jul. 31, 2014	3,078	$ 3	3,558	(6,430)	(2)	5,949
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	337				(28)	365
Issuance of treasury stock under employee stock plans, shares		6,565,000
Issuance of stock under employee stock plans	107		107
Stock repurchases under stock repurchase programs, shares		(13,809,000)
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, shares at Jul. 31, 2015	277,706,000	277,706,000
Ending Balance at Jul. 31, 2015	$ 2,332	$ 3	4,007	(7,675)	(30)	6,027
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	977				(2)	979
Issuance of treasury stock under employee stock plans, shares		4,963,000
Issuance of stock under employee stock plans	89		89
Stock repurchases under stock repurchase programs, shares		(24,816,000)
Stock repurchases under stock repurchase programs	(2,264)			(2,264)
Cash dividends declared	(319)					(319)
Tax benefit from share-based compensation plans	59		59
Share-based compensation expense	$ 287		287
Ending Balance, shares at Jul. 31, 2016	257,853,000	257,853,000
Ending Balance at Jul. 31, 2016	$ 1,161	$ 3	$ 4,442	$ (9,939)	$ (32)	$ 6,687