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Acquisitions Fiscal 2014 Purchase Price Allocation (Details) (USD $)
In Millions, unless otherwise specified
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Nov. 15, 2013
Business Acquisition [Line Items]        
Goodwill $ 1,671us-gaap_Goodwill $ 1,667us-gaap_Goodwill $ 1,516us-gaap_Goodwill  
ServiceMesh, Inc        
Business Acquisition [Line Items]        
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   (4)csc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAccruedExpensesandDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
   
Deferred tax liabilities   (38)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
   
Total identifiable net assets acquired   98us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
   
Goodwill   184us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
   
Total purchase consideration   282us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
  282us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
Developed Technology Rights | ServiceMesh, Inc        
Business Acquisition [Line Items]        
Finite-lived intangible asset acquired   94us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
   
Customer Relationships and Trade Names | ServiceMesh, Inc        
Business Acquisition [Line Items]        
Finite-lived intangible asset acquired   $ 10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= csc_ServiceMeshIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerRelationshipsandTradeNamesMember