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Balance Sheet and Other Details - Deferred Revenue (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jul. 31, 2021
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Disaggregation of Revenue [Line Items] |  |
Deferred revenue | $ 22,313 | $ 22,164
Current | 12,268 | 12,148
Noncurrent | 10,045 | 10,016
Product |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 9,767 | 9,416
Service |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | $ 12,546 | $ 12,748

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