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Financing Receivables - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 24, 2020 | Jul. 25, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Lease receivables terms, on average | 4 years |
Loan receivables term | 3 years |
Threshold for past due receivables | 31 days |
Financing receivable, 120 days plus past due but on accrual status | $ 47 | $ 67
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financed service contracts term | 1 year |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financed service contracts term | 3 years |

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- Definition Financing Receivable, 120 Days or More Past Due, Still Accruing + References No definition available. + Details
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Namespace Prefix: | csco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Service Agreement Term + References No definition available. + Details
Name: | csco_ServiceAgreementTerm
Namespace Prefix: | csco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of loan receivable arrangement. + References No definition available. + Details
Name: | csco_TermOfLoanReceivableArrangement
Namespace Prefix: | csco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Threshold For Past Due Receivables + References No definition available. + Details
Name: | csco_ThresholdForPastDueReceivables
Namespace Prefix: | csco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessor's sales-type lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorSalesTypeLeaseTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |