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Balance Sheet and Other Details - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jan. 23, 2021 | Jan. 25, 2020 | Jul. 25, 2020
Disaggregation of Revenue [Line Items] |  |  |
Provision for inventory | $ 65 | $ 30 |
Deferred revenue | 20,846 |  | $ 20,446
Remaining performance obligation | 28,178 |  | 28,354
Unbilled Contract Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligation | $ 7,300 |  | $ 7,900

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