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Acquisitions and Divestitures - Additional Information (Details) $ in Millions	12 Months Ended
	Jul. 31, 2021 USD ($) acquisition	Jul. 25, 2020 USD ($) acquisition	Jul. 27, 2019 USD ($) acquisition
Business Acquisition [Line Items]
Number of business combinations (acquisition) | acquisition	13	6	5
Cash and cash equivalents acquired	$ 338	$ 23
Total purchase consideration	7,455	359	$ 2,700
General and Administrative Expense
Business Acquisition [Line Items]
Total transaction costs	$ 46	$ 21	$ 21

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-Topic 805
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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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The number of businesses acquired by the entity during the period.

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