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Revenue - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 27, 2019 | Jul. 29, 2018 | Jul. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Payment terms | 30 days |  |
Accounts receivable, net | $ 5,491 | $ 5,450 | $ 5,554
Total deferred revenue | 18,467 |  | 19,685
Revenue recognized | 9,600 |  |
Remaining performance obligation | 25,300 |  |
Total deferred sales commissions | 750 |  |
Amortization of sales commissions, expense | 471 |  |
Unbilled Contract Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Remaining performance obligation | 6,800 |  |
Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  | (104) |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total deferred revenue | 2,800 | $ 2,800 |
Software and Service Agreements |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total contract assets | $ 860 |  | $ 122

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