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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average lease term | 4 years |  |
Loan receivables term | 3 years |  |
Financing receivable, threshold period past due | 31 days |  |
Financing receivable, threshold for not accruing interest | 120 days |  |
Depreciation and amortization expenses | $ 800 | $ 900 | $ 1,000
Allowance for future sales returns | 55 | 79 |
Advertising costs | $ 268 | $ 187 | $ 204
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Financed service contracts term | 1 year |  |
Channel partners revolving short-term financing payment term | 60 days |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan receivables term | 3 years |  |
Financed service contracts term | 3 years |  |
Channel partners revolving short-term financing payment term | 90 days |  |
End user lease and loan term | 3 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Threshold period for when financing receivable is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 + Details
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