Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions		Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning Balance at Jul. 31, 2016	[1]	$ 1,492	$ 3	$ 4,442	$ (9,939)	$ (32)	$ 7,018
Beginning Balance (in shares) at Jul. 31, 2016	[1]		257,853
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		995				10	985
Issuance of stock under employee stock plans, net of shares withheld for employee taxes		73		73
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)			4,715
Stock repurchases under stock repurchase programs		(839)			(839)
Stock repurchases under stock repurchase programs (in shares)			(6,900)
Dividends and dividend rights declared		(357)					(357)
Share-based compensation expense		333		333
Ending Balance at Jul. 31, 2017		1,699	$ 3	4,854	(10,778)	(22)	7,642
Ending Balance (in shares) at Jul. 31, 2017			255,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		1,315				(14)	1,329
Issuance of stock under employee stock plans, net of shares withheld for employee taxes		96		96
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)			4,818
Stock repurchases under stock repurchase programs		(272)			(272)
Stock repurchases under stock repurchase programs (in shares)			(1,870)
Dividends and dividend rights declared		(407)					(407)
Share-based compensation expense		385		385
Ending Balance at Jul. 31, 2018		$ 2,816	$ 3	5,335	(11,050)	(36)	8,564
Ending Balance (in shares) at Jul. 31, 2018		258,616	258,616
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		$ 1,557					1,557
Issuance of stock under employee stock plans, net of shares withheld for employee taxes		32		32
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)			4,019
Stock repurchases under stock repurchase programs		(561)			(561)
Stock repurchases under stock repurchase programs (in shares)			(2,455)
Dividends and dividend rights declared		(500)
Share-based compensation expense		405		405
Ending Balance at Jul. 31, 2019		$ 3,749	$ 3	$ 5,772	$ (11,611)	$ (36)	$ 9,621
Ending Balance (in shares) at Jul. 31, 2019		260,180	260,180

[1] The cumulative effect adjustment to retained earnings related to the adoption of ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” as of July 31, 2016 was $331 million.