Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Shares of Common Stock	Common Stock and Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning Balance, shares at Jul. 31, 2014		284,950
Beginning Balance at Jul. 31, 2014	$ 3,078		$ 3,561	$ (6,430)	$ (2)	$ 5,949
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	333				(18)	351
Issuance of stock under employee stock plans, shares		4,431
Issuance of stock under employee stock plans	$ 129		129
Stock repurchases under stock repurchase programs, shares	(13,700)	(13,723)
Stock repurchases under stock repurchase programs	$ (1,236)			(1,236)
Dividends and dividend rights declared	(218)					(218)
Tax benefit from share-based compensation plans	51		51
Share-based compensation expense	184		184
Ending Balance, shares at Apr. 30, 2015		275,658
Ending Balance at Apr. 30, 2015	2,321		3,925	(7,666)	(20)	6,082
Beginning Balance, shares at Jul. 31, 2015		277,706
Beginning Balance at Jul. 31, 2015	2,332		4,010	(7,675)	(30)	6,027
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	1,023				4	1,019
Issuance of stock under employee stock plans, shares		2,767
Issuance of stock under employee stock plans	$ 89		89
Stock repurchases under stock repurchase programs, shares	(24,100)	(24,085)
Stock repurchases under stock repurchase programs	$ (2,190)			(2,190)
Dividends and dividend rights declared	(241)					(241)
Tax benefit from share-based compensation plans	30		30
Share-based compensation expense	205		205
Ending Balance, shares at Apr. 30, 2016		256,388
Ending Balance at Apr. 30, 2016	$ 1,248		$ 4,334	$ (9,865)	$ (26)	$ 6,805