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Segment Information and Major Customers - Additional Information (Details) $ in Millions	12 Months Ended
	Jul. 31, 2021 USD ($) segment	Jul. 25, 2020 USD ($)	Jul. 27, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of geographic segments | segment	3
Total revenue	$ 49,818	$ 49,301	$ 51,904
United States
Segment Reporting Information [Line Items]
Total revenue	$ 26,100	$ 26,100	$ 27,400

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