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Balance Sheet and Other Details - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Disaggregation of Revenue [Line Items] |  |  |
Provision for inventory | $ 116 | $ 74 | $ 77
Deferred revenue | 22,164 | 20,446 |
Remaining performance obligation | 30,893 | 28,354 |
Unbilled Contract Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligation | $ 8,700 | $ 7,900 |

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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