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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	1,599				(2)	1,601
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		2,603
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	138		138
Stock repurchases under stock repurchase programs (in shares)		(1,885)
Stock repurchases under stock repurchase programs	(413)			(413)
Dividends and dividend rights declared	(376)					(376)
Share-based compensation expense	306		306
Ending Balance (in shares) at Apr. 30, 2019		259,334
Ending Balance at Apr. 30, 2019	4,070		5,782	(11,463)	(38)	9,789
Beginning Balance (in shares) at Jan. 31, 2019		259,110
Beginning Balance at Jan. 31, 2019	2,796		5,623	(11,328)	(36)	8,537
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	1,376				(2)	1,378
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		767
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	60		60
Stock repurchases under stock repurchase programs (in shares)		(543)
Stock repurchases under stock repurchase programs	(135)			(135)
Dividends and dividend rights declared	(126)					(126)
Share-based compensation expense	99		99
Ending Balance (in shares) at Apr. 30, 2019		259,334
Ending Balance at Apr. 30, 2019	4,070		5,782	(11,463)	(38)	9,789
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	1,373				(8)	1,381
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		1,745
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	$ 33		33
Stock repurchases under stock repurchase programs (in shares)	(1,200)	(1,176)
Stock repurchases under stock repurchase programs	$ (318)			(318)
Dividends and dividend rights declared	(421)					(421)
Share-based compensation expense	324		324
Ending Balance (in shares) at Apr. 30, 2020		260,749
Ending Balance at Apr. 30, 2020	4,740		6,132	(11,929)	(44)	10,581
Beginning Balance (in shares) at Jan. 31, 2020		260,517
Beginning Balance at Jan. 31, 2020	3,727		6,014	(11,889)	(35)	9,637
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	1,075				(9)	1,084
Issuance of stock under employee stock plans, net of shares withheld for employee taxes (in shares)		369
Issuance of stock under employee stock plans, net of shares withheld for employee taxes	14		14
Stock repurchases under stock repurchase programs (in shares)		(137)
Stock repurchases under stock repurchase programs	(40)			(40)
Dividends and dividend rights declared	(140)					(140)
Share-based compensation expense	104		104
Ending Balance (in shares) at Apr. 30, 2020		260,749
Ending Balance at Apr. 30, 2020	$ 4,740		$ 6,132	$ (11,929)	$ (44)	$ 10,581