v2.4.1.9
Employee Benefit Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended
Apr. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 112us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 187us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 276us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted- Average Remaining Contractual Life (in Year/Month/Date)) 1 year 3 months 18 days    
Weighted- Average Exercise Price per Share $ 28.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 26.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 24.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Aggregate Intrinsic Value $ 289us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Number Exercisable, shares 111us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 183us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Weighted- Average Exercise Price per Share $ 28.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 26.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Aggregate Intrinsic Value 242us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
$ 0.01 – 20.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
Weighted- Average Remaining Contractual Life (in Year/Month/Date)) 4 years 7 months 6 days    
Weighted- Average Exercise Price per Share $ 6.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
Aggregate Intrinsic Value 116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
Number Exercisable, shares 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
Weighted- Average Exercise Price per Share $ 8.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
Aggregate Intrinsic Value 69us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_ZeroPointZeroOneToFifteenPointZeroZeroMember
   
$ 20.01 – 25.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
Weighted- Average Remaining Contractual Life (in Year/Month/Date)) 7 months 6 days    
Weighted- Average Exercise Price per Share $ 22.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
Aggregate Intrinsic Value 140us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
Number Exercisable, shares 24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
Weighted- Average Exercise Price per Share $ 22.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
Aggregate Intrinsic Value 140us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyPointZeroOneToTwentyFivePointZeroZeroMember
   
$ 25.01 – 30.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
Weighted- Average Remaining Contractual Life (in Year/Month/Date)) 1 year 3 months 18 days    
Weighted- Average Exercise Price per Share $ 26.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
Aggregate Intrinsic Value 33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
Number Exercisable, shares 15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
Weighted- Average Exercise Price per Share $ 26.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
Aggregate Intrinsic Value 33us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_A25.0130.00Member
   
$ 30.01 – 35.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Outstanding (in shares) 68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember
   
Weighted- Average Remaining Contractual Life (in Year/Month/Date)) 1 year 3 months 18 days    
Weighted- Average Exercise Price per Share $ 32.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember
   
Aggregate Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember
   
Number Exercisable, shares 68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember
   
Weighted- Average Exercise Price per Share $ 32.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember
   
Aggregate Intrinsic Value $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csco_TwentyFivePointZeroOneToThirtyFivePointZeroZeroMember