Condensed Consolidated Statements of Stockholders' Equity - 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 (in shares) at Jul. 31, 2018		258,616
Beginning Balance at Jul. 31, 2018	$ 2,816		$ 5,338	$ (11,050)	$ (36)	$ 8,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	30				(4)	34
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		1,422
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	57		57
Stock repurchases under stock repurchase programs (in shares)		(467)
Stock repurchases under stock repurchase programs	(101)			(101)
Dividends and dividend rights declared	(126)					(126)
Share-based compensation expense	106		106
Ending Balance (in shares) at Oct. 31, 2018		259,571
Ending Balance at Oct. 31, 2018	2,782		5,501	(11,151)	(40)	8,472
Beginning Balance (in shares) at Jul. 31, 2019		260,180
Beginning Balance at Jul. 31, 2019	3,749		5,775	(11,611)	(36)	9,621
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	58				1	57
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		690
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	$ (6)		(6)
Stock repurchases under stock repurchase programs (in shares)	(515)	(515)
Stock repurchases under stock repurchase programs	$ (139)			(139)
Dividends and dividend rights declared	(141)					(141)
Share-based compensation expense	112		112
Ending Balance (in shares) at Oct. 31, 2019		260,355
Ending Balance at Oct. 31, 2019	$ 3,633		$ 5,881	$ (11,750)	$ (35)	$ 9,537