Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Shares of Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Effect of adoption of accounting standard	Effect of adoption of accounting standard Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Jul. 25, 2020		4,237
Balance, beginning of period at Jul. 25, 2020	$ 37,920		$ 41,202	$ (2,763)	$ (519)	$ (38)	$ (38)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,591			10,591
Other comprehensive income (loss)	102				102
Issuance of common stock (in shares)		58
Issuance of common stock	$ 643		643
Repurchase of common stock (in shares)	(64)	(64)
Repurchase of common stock	$ (2,902)		(625)	(2,277)
Shares repurchased for tax withholdings on vesting of restricted stock units and other (in shares)		(14)
Shares repurchased for tax withholdings on vesting of restricted stock units and other	(636)		(636)
Cash dividends declared	(6,166)			(6,166)
Share-based compensation	1,761		1,761
Other	0		1	(1)
Ending balance (in shares) at Jul. 31, 2021		4,217
Balance, end of period at Jul. 31, 2021	41,275		42,346	(654)	(417)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,812			11,812
Other comprehensive income (loss)	(1,205)				(1,205)
Issuance of common stock (in shares)		54
Issuance of common stock	$ 660		660
Repurchase of common stock (in shares)	(146)	(146)
Repurchase of common stock	$ (7,734)		(1,490)	(6,244)
Shares repurchased for tax withholdings on vesting of restricted stock units and other (in shares)		(13)
Shares repurchased for tax withholdings on vesting of restricted stock units and other	(692)		(692)
Cash dividends declared	(6,224)			(6,224)
Share-based compensation	1,886		1,886
Other (in shares)		(2)
Other	(5)		4	(9)
Ending balance (in shares) at Jul. 30, 2022		4,110
Balance, end of period at Jul. 30, 2022	39,773		42,714	(1,319)	(1,622)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,613			12,613
Other comprehensive income (loss)	47				47
Issuance of common stock (in shares)		57
Issuance of common stock	$ 700		700
Repurchase of common stock (in shares)	(88)	(88)
Repurchase of common stock	$ (4,271)		(930)	(3,341)
Shares repurchased for tax withholdings on vesting of restricted stock units and other (in shares)		(13)
Shares repurchased for tax withholdings on vesting of restricted stock units and other	(551)		(551)
Cash dividends declared	(6,302)			(6,302)
Share-based compensation	2,353		2,353
Other	(9)		3	(12)
Ending balance (in shares) at Jul. 29, 2023		4,066
Balance, end of period at Jul. 29, 2023	$ 44,353		$ 44,289	$ 1,639	$ (1,575)