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Balance Sheet and Other Details - Deferred Revenue (Details) - USD ($) $ in Millions	Oct. 30, 2021	Jul. 31, 2021
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 22,072	$ 22,164
Current	12,017	12,148
Noncurrent	10,055	10,016
Product
Disaggregation of Revenue [Line Items]
Deferred revenue	9,681	9,416
Service
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 12,391	$ 12,748

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