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Financing Receivables and Operating Leases (Schedule Of Financing Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 24, 2015
Oct. 25, 2014
Jul. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
Financing Receivables [Line Items]            
Allowance for credit loss $ (375)us-gaap_FinancingReceivableAllowanceForCreditLosses $ (368)us-gaap_FinancingReceivableAllowanceForCreditLosses $ (349)us-gaap_FinancingReceivableAllowanceForCreditLosses $ (374)us-gaap_FinancingReceivableAllowanceForCreditLosses $ (350)us-gaap_FinancingReceivableAllowanceForCreditLosses $ (344)us-gaap_FinancingReceivableAllowanceForCreditLosses
Current 4,210us-gaap_NotesAndLoansReceivableNetCurrent   4,153us-gaap_NotesAndLoansReceivableNetCurrent      
Deferred revenue: 14,021us-gaap_DeferredRevenue   14,142us-gaap_DeferredRevenue      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 3,369csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  3,532csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Residual value 228us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  233us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Unearned income (206)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  (238)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Allowance for credit loss (250)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  (233)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Current 1,462us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  1,476us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Noncurrent 1,679us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  1,818us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Total, net 3,141us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
  3,294us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_LeaseReceivablesMember
     
Loan Receivables            
Financing Receivables [Line Items]            
Gross 1,674csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  1,683csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Residual value 0us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  0us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Unearned income 0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Allowance for credit loss (85)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  (98)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Current 782us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  728us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Noncurrent 807us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  857us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Total, net 1,589us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
  1,585us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
     
Financed Service Contracts and Other            
Financing Receivables [Line Items]            
Gross 3,069csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  3,210csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Residual value 0us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  0us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Unearned income 0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  0us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Allowance for credit loss (40)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  (18)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Current 1,966us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  1,949us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Noncurrent 1,063us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  1,243us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Total, net 3,029us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
  3,192us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_FinancedServiceContractsAndOtherMember
     
Total            
Financing Receivables [Line Items]            
Gross 8,112csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  8,425csco_FinancingReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Residual value 228us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  233us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Unearned income (206)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  (238)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Allowance for credit loss (375)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  (349)us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Current 4,210us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  4,153us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Noncurrent 3,549us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  3,918us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
     
Total, net $ 7,759us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember
  $ 8,071us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= csco_TotalFinancingReceivablesMember