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Segment Information and Major Customers - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 23, 2021 USD ($) | Jan. 25, 2020 USD ($) | Jan. 23, 2021 USD ($) segment | Jan. 25, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of geographic segments | segment |  |  | 3 |
Revenue | $ 11,960 | $ 12,005 | $ 23,889 | $ 25,164
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 6,200 | $ 6,200 | $ 12,700 | $ 13,300

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