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, 2017	$ 1,699	$ 3	$ 4,854	$ (10,778)	$ (22)	$ 7,642
Beginning 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
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)					(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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 1,830				4	1,826
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	(31)		(31)
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		2,736
Stock repurchases under stock repurchase programs	(318)			(318)
Stock repurchases under stock repurchase programs (in shares)		(1,176)
Dividends and dividend rights declared	(562)					(562)
Share-based compensation expense	438		438
Ending balance at Jul. 31, 2020	$ 5,106	$ 3	$ 6,179	$ (11,929)	$ (32)	$ 10,885
Ending balance (in shares) at Jul. 31, 2020	261,740	261,740