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Stockholders' Equity - Additional Information (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
Stockholders' Equity Note [Abstract]
Cash dividends paid per common share (in dollars per share)	$ 1.46	$ 1.42	$ 1.36
Payment of dividends	$ 6,163,000,000	$ 6,016,000,000	$ 5,979,000,000
Remaining authorized repurchase amount	7,900,000,000
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement	$ 25,000,000	$ 0	$ 40,000,000

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Aggregate dividends paid during the period for each share of common stock outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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Amount remaining of a stock repurchase plan authorized.

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