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]
Repurchase of common stock (in shares)	(20)
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. 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	4,719				4,719
Other comprehensive income (loss)	301						301
Issuance of common stock (in shares)			31
Issuance of common stock	306			306
Repurchase of common stock (in shares)			(39)
Repurchase of common stock	(1,601)			(375)	(1,226)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(8)
Shares repurchased for tax withholdings on vesting of restricted stock units	(317)			(317)
Cash dividends declared	(3,043)				(3,043)
Share-based compensation	874			874
Ending balance (in shares) at Jan. 23, 2021			4,221
Ending balance at Jan. 23, 2021	39,121			41,690	(2,351)		(218)
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]
Repurchase of common stock (in shares)	(15)
Ending balance (in shares) at Jul. 31, 2021			4,217
Ending balance at Jul. 31, 2021	$ 41,275			42,346	(654)		(417)
Beginning balance (in shares) at Oct. 24, 2020			4,222
Beginning balance at Oct. 24, 2020	38,157			41,360	(2,756)		(447)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,545				2,545
Other comprehensive income (loss)	229						229
Issuance of common stock (in shares)			24
Issuance of common stock	$ 305			305
Repurchase of common stock (in shares)	(19)		(19)
Repurchase of common stock	$ (801)			(183)	(618)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(6)
Shares repurchased for tax withholdings on vesting of restricted stock units	(228)			(228)
Cash dividends declared	(1,522)				(1,522)
Share-based compensation	436			436
Ending balance (in shares) at Jan. 23, 2021			4,221
Ending balance at Jan. 23, 2021	39,121			41,690	(2,351)		(218)
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]
Repurchase of common stock (in shares)	(5)
Ending balance (in shares) at Oct. 30, 2021			4,217
Ending balance at Oct. 30, 2021	$ 42,701			42,621	553		(473)
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	5,953				5,953
Other comprehensive income (loss)	(372)						(372)
Issuance of common stock (in shares)			29
Issuance of common stock	306			306
Repurchase of common stock (in shares)			(87)
Repurchase of common stock	(5,080)			(882)	(4,198)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(8)
Shares repurchased for tax withholdings on vesting of restricted stock units	(411)			(411)
Cash dividends declared	(3,102)				(3,102)
Share-based compensation	930			930
Other	(3)			2	(5)
Ending balance (in shares) at Jan. 29, 2022			4,151
Ending balance at Jan. 29, 2022	39,496			42,291	(2,006)		(789)
Beginning balance (in shares) at Oct. 30, 2021			4,217
Beginning balance at Oct. 30, 2021	42,701			42,621	553		(473)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,973				2,973
Other comprehensive income (loss)	(316)						(316)
Issuance of common stock (in shares)			22
Issuance of common stock	$ 306			306
Repurchase of common stock (in shares)	(82)		(82)
Repurchase of common stock	$ (4,824)			(836)	(3,988)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(6)
Shares repurchased for tax withholdings on vesting of restricted stock units	(278)			(278)
Cash dividends declared	(1,541)				(1,541)
Share-based compensation	477			477
Other	(2)			1	(3)
Ending balance (in shares) at Jan. 29, 2022			4,151
Ending balance at Jan. 29, 2022	$ 39,496			$ 42,291	$ (2,006)		$ (789)