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Revenue - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 24, 2020 | Oct. 26, 2019 | Jul. 25, 2020
Disaggregation of Revenue [Line Items] |  |  |
Allowance for future sales returns | $ 81 |  | $ 79
Payment terms | 30 days |  |
Accounts receivable, net | $ 3,980 |  | 5,472
Deferred revenue | 20,473 |  | 20,446
Revenue recognized | 3,900 |  |
Total deferred sales commissions | 771 |  | 732
Amortization of sales commissions, expense | 123 | $ 116 |
Software and Service Agreements |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract assets | $ 1,200 |  | $ 1,200

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