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(Acquisitions) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended
Jul. 31, 2014
Nov. 15, 2013
Mar. 28, 2014
Aug. 05, 2013
Jan. 02, 2015
Dec. 27, 2013
Business Acquisition [Line Items]            
Goodwill, net     $ 1,667us-gaap_Goodwill   1,669us-gaap_Goodwill  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     1,667us-gaap_Goodwill   1,669us-gaap_Goodwill  
Privately Held Entity [Member]            
Business Acquisition [Line Items]            
Cash consideration 35us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Current assets acquired 4csc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Intangible assets acquired 9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Current liabilities assumed 9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Total purchase consideration 31us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Intangible assets acquired 9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
Total purchase consideration 31us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_PrivatelyHeldEntityMember
         
ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Total purchase consideration   282us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Cash paid for acquisition   163us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Debt retired for acquisition   10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Contingent liability   119us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Acquisition related costs   4us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Contingent consideration   98us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Change in contingent consideration     18us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
     
Goodwill, net   184us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Accounts receivable and other current assets   3csc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesandOtherCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Deferred tax assets   31us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Property and equipment and other non-current assets   2csc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPropertyPlantandEquipmentandOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Deferred revenue and other current liabilities   4csc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAccruedExpensesandDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Deferred tax liabilities   38us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Total identifiable net assets acquired   98us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Goodwill, net   184us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Total purchase consideration   282us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
InfoChimps Inc [Member]            
Business Acquisition [Line Items]            
Cash consideration       27us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= csc_InfoChimpsIncMember
   
Current liabilities assumed       2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= csc_InfoChimpsIncMember
   
Total purchase consideration       27us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_InfoChimpsIncMember
   
Current and long-term assets acquired       2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= csc_InfoChimpsIncMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Total purchase consideration       27us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_InfoChimpsIncMember
   
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Contingent consideration           137us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Selling, General and Administrative Expenses [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Contingent consideration   21us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
       
GBS Segment [Member]            
Business Acquisition [Line Items]            
Goodwill, net     680us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
  651us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     680us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
  651us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
 
GBS Segment [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Goodwill, net     28us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     28us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
     
GIS Segment [Member]            
Business Acquisition [Line Items]            
Goodwill, net     199us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
  199us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     199us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
  199us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
 
GIS Segment [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Goodwill, net     120us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     120us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
     
NPS [Member]            
Business Acquisition [Line Items]            
Goodwill, net     788us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
  819us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     788us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
  819us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
 
NPS [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Goodwill, net     36us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Goodwill, net     36us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
     
Restricted Stock Units (RSUs) [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Granted (in shares)   41,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
       
Developed Technology Rights [Member]            
Intangible Assets - Useful Life [Abstract]            
Intangible assets, useful life         9 years  
Developed Technology Rights [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Intangible assets acquired   94us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Intangible assets acquired   94us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
       
Customer Relationships and Trade Names [Member] | ServiceMesh, Inc [Member]            
Business Acquisition [Line Items]            
Intangible assets acquired   10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerRelationshipsandTradeNamesMember
       
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]            
Intangible assets acquired   $ 10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerRelationshipsandTradeNamesMember
       
Customer Relationships [Member]            
Intangible Assets - Useful Life [Abstract]            
Intangible assets, useful life         3 years  
Minimum [Member] | Trade Names [Member]            
Intangible Assets - Useful Life [Abstract]            
Intangible assets, useful life         4 years  
Maximum [Member] | Trade Names [Member]            
Intangible Assets - Useful Life [Abstract]            
Intangible assets, useful life         6 years