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	223				0	223
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		1,836
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	78		78
Stock repurchases under stock repurchase programs (in shares)		(1,342)
Stock repurchases under stock repurchase programs	(278)			(278)
Dividends and dividend rights declared	(250)					(250)
Share-based compensation expense	207		207
Ending Balance (in shares) at Jan. 31, 2019		259,110
Ending Balance at Jan. 31, 2019	2,796		5,623	(11,328)	(36)	8,537
Beginning Balance (in shares) at Oct. 31, 2018		259,571
Beginning Balance at Oct. 31, 2018	2,782		5,501	(11,151)	(40)	8,472
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	193				4	189
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		414
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	21		21
Stock repurchases under stock repurchase programs (in shares)		(875)
Stock repurchases under stock repurchase programs	(177)			(177)
Dividends and dividend rights declared	(124)					(124)
Share-based compensation expense	101		101
Ending Balance (in shares) at Jan. 31, 2019		259,110
Ending Balance at Jan. 31, 2019	2,796		5,623	(11,328)	(36)	8,537
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	298				1	297
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		1,376
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	$ 19		19
Stock repurchases under stock repurchase programs (in shares)	(1,000)	(1,039)
Stock repurchases under stock repurchase programs	$ (278)			(278)
Dividends and dividend rights declared	(281)					(281)
Share-based compensation expense	220		220
Ending Balance (in shares) at Jan. 31, 2020		260,517
Ending Balance at Jan. 31, 2020	3,727		6,014	(11,889)	(35)	9,637
Beginning Balance (in shares) at Oct. 31, 2019		260,355
Beginning Balance at Oct. 31, 2019	3,633		5,881	(11,750)	(35)	9,537
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	240				0	240
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		686
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	25		25
Stock repurchases under stock repurchase programs (in shares)		(524)
Stock repurchases under stock repurchase programs	(139)			(139)
Dividends and dividend rights declared	(140)					(140)
Share-based compensation expense	108		108
Ending Balance (in shares) at Jan. 31, 2020		260,517
Ending Balance at Jan. 31, 2020	$ 3,727		$ 6,014	$ (11,889)	$ (35)	$ 9,637