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	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Jul. 27, 2019			4,250
Beginning balance at Jul. 27, 2019	$ 33,571			$ 40,266	$ (5,903)		$ (792)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,578				8,578
Other comprehensive income (loss)	(317)						(317)
Issuance of common stock (in shares)			40
Issuance of common stock	335			335
Repurchase of common stock (in shares)			(59)
Repurchase of common stock	(2,619)			(561)	(2,058)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(11)
Shares repurchased for tax withholdings on vesting of restricted stock units	(519)			(519)
Cash dividends declared	(4,491)				(4,491)
Share-based compensation	1,170			1,170
Ending balance (in shares) at Apr. 25, 2020			4,220
Ending balance at Apr. 25, 2020	35,708			40,691	(3,874)		(1,109)
Beginning balance (in shares) at Jan. 25, 2020			4,241
Beginning balance at Jan. 25, 2020	35,533			40,617	(4,384)		(700)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,774				2,774
Other comprehensive income (loss)	(409)						(409)
Issuance of common stock (in shares)			6
Issuance of common stock	$ 1			1
Repurchase of common stock (in shares)	(25)		(25)
Repurchase of common stock	$ (981)			(236)	(745)
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	(82)			(82)
Cash dividends declared	(1,519)				(1,519)
Share-based compensation	391			391
Ending balance (in shares) at Apr. 25, 2020			4,220
Ending balance at Apr. 25, 2020	$ 35,708			40,691	(3,874)		(1,109)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	0
Ending balance (in shares) at Jul. 25, 2020			4,237
Ending balance at Jul. 25, 2020	$ 37,920	$ (38)		41,202	(2,763)	$ (38)	(519)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,582				7,582
Other comprehensive income (loss)	231						231
Issuance of common stock (in shares)			37
Issuance of common stock	307			307
Repurchase of common stock (in shares)			(49)
Repurchase of common stock	(2,111)			(478)	(1,633)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(10)
Shares repurchased for tax withholdings on vesting of restricted stock units	(419)			(419)
Cash dividends declared	(4,604)				(4,604)
Share-based compensation	1,337			1,337
Ending balance (in shares) at May. 01, 2021			4,215
Ending balance at May. 01, 2021	40,205			41,949	(1,456)		(288)
Beginning balance (in shares) at Jan. 23, 2021			4,221
Beginning balance at Jan. 23, 2021	39,121			41,690	(2,351)		(218)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,863				2,863
Other comprehensive income (loss)	(70)						(70)
Issuance of common stock (in shares)			6
Issuance of common stock	$ 1			1
Repurchase of common stock (in shares)	(10)		(10)
Repurchase of common stock	$ (510)			(103)	(407)
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	(102)			(102)
Cash dividends declared	(1,561)				(1,561)
Share-based compensation	463			463
Ending balance (in shares) at May. 01, 2021			4,215
Ending balance at May. 01, 2021	$ 40,205			$ 41,949	$ (1,456)		$ (288)