Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Shares of Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Jul. 25, 2020			4,237
Beginning balance at Jul. 25, 2020	$ 37,920	$ (38)		$ 41,202	$ (2,763)	$ (38)	$ (519)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,174				2,174
Other comprehensive income (loss)	72						72
Issuance of common stock (in shares)			7
Issuance of common stock	$ 1			1
Repurchase of common stock (in shares)	(20)		(20)
Repurchase of common stock	$ (800)			(192)	(608)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(2)
Shares repurchased for tax withholdings on vesting of restricted stock units	(89)			(89)
Cash dividends declared	(1,521)				(1,521)
Share-based compensation	438			438
Ending balance (in shares) at Oct. 24, 2020			4,222
Ending balance at Oct. 24, 2020	38,157			41,360	(2,756)		(447)
Beginning balance (in shares) at Jul. 31, 2021			4,217
Beginning balance at Jul. 31, 2021	41,275			42,346	(654)		(417)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,980				2,980
Other comprehensive income (loss)	$ (56)						(56)
Issuance of common stock (in shares)			7
Repurchase of common stock (in shares)	(5)		(5)
Repurchase of common stock	$ (256)			(46)	(210)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(2)
Shares repurchased for tax withholdings on vesting of restricted stock units	(133)			(133)
Cash dividends declared	(1,561)				(1,561)
Share-based compensation	453			453
Other	(1)			1	(2)
Ending balance (in shares) at Oct. 30, 2021			4,217
Ending balance at Oct. 30, 2021	$ 42,701			$ 42,621	$ 553		$ (473)