v2.4.1.9

Employee Benefit Plans (Summary of Share-Based Awards available for Grant) (Details) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Apr. 25, 2015 | Jul. 26, 2014
Employee Stock Benefit Plans [Abstract] |  |
Balance at beginning of fiscal period | 310 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | 228 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Restricted stock, stock units, and other share-based awards granted | (79)csco_Reductionfromavailableforgrantsharebalanceduetoissuanceofstockawards | (98)csco_Reductionfromavailableforgrantsharebalanceduetoissuanceofstockawards
Share-based awards canceled/forfeited/expired | 33 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited | 36 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
Additional shares reserved |  | 135 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Shares withheld for taxes and not issued | 23 csco_Shareswithheldfortaxandnotissued | 6 csco_Shareswithheldfortaxandnotissued
Other | (2)csco_AdjustmenttoShareBasedAwardsGrantsForThePeriod | 3 csco_AdjustmenttoShareBasedAwardsGrantsForThePeriod
Balance at end of fiscal period | 285 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | 310 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

X
- Definition Adjustment to Share Based Awards Grants For The Period + References No definition available. + Details
Name: | csco_AdjustmenttoShareBasedAwardsGrantsForThePeriod
Namespace Prefix: | csco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reduction from available for grant share balance due to issuance of stock awards + References No definition available. + Details
Name: | csco_Reductionfromavailableforgrantsharebalanceduetoissuanceofstockawards
Namespace Prefix: | csco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shares withheld for tax and not issued + References No definition available. + Details
Name: | csco_Shareswithheldfortaxandnotissued
Namespace Prefix: | csco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares (or other type of equity) forfeited during the period. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration