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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 02, 2015
Dec. 27, 2013
Jan. 02, 2015
Dec. 27, 2013
Mar. 28, 2014
Finite-Lived Intangible Assets, Net [Abstract]          
Gross Carrying Value $ 4,268us-gaap_FiniteLivedIntangibleAssetsGross   $ 4,268us-gaap_FiniteLivedIntangibleAssetsGross   $ 4,383us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization 3,007us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   3,007us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   3,033us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Value 1,261us-gaap_FiniteLivedIntangibleAssetsNet   1,261us-gaap_FiniteLivedIntangibleAssetsNet   1,350us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense 103us-gaap_AmortizationOfIntangibleAssets 97us-gaap_AmortizationOfIntangibleAssets 325us-gaap_AmortizationOfIntangibleAssets 289us-gaap_AmortizationOfIntangibleAssets  
Outsourcing Contract Costs Amortization Expense 8csc_OutsourcingContractCostsAmortizationExpense 9csc_OutsourcingContractCostsAmortizationExpense 25csc_OutsourcingContractCostsAmortizationExpense 26csc_OutsourcingContractCostsAmortizationExpense  
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]          
Remainder of 2015 112us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear   112us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2016 325us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   325us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 256us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   256us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 205us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   205us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 176us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   176us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
GIS [Member]          
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]          
Gain on sale of intangible asset     43us-gaap_GainLossOnDispositionOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
   
Outsourcing contract costs          
Finite-Lived Intangible Assets, Net [Abstract]          
Gross Carrying Value 1,333us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  1,333us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  1,465us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
Accumulated Amortization 1,003us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  1,003us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  1,038us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
Net Carrying Value 330us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  330us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
  427us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_OutsourcingContractCostsMember
Software          
Finite-Lived Intangible Assets, Net [Abstract]          
Gross Carrying Value 2,457us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  2,457us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  2,330us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Accumulated Amortization 1,681us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  1,681us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  1,680us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Net Carrying Value 776us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  776us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  650us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Software | Internal-use software          
Finite-Lived Intangible Assets, Net [Abstract]          
Amortization expense 53us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember
44us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember
163us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember
134us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember
 
Customer and other intangible assets          
Finite-Lived Intangible Assets, Net [Abstract]          
Gross Carrying Value 478us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  478us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  588us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
Accumulated Amortization 323us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  323us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  315us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
Net Carrying Value 155us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  155us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
  273us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
Amortization expense 2us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
2us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
7us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
8us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_CustomerAndOtherIntangibleAssetsMember
 
Network-related Intangible Assets | GIS [Member]          
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]          
Proceeds from sale of intangible assets     17us-gaap_ProceedsFromSaleOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_NetworkrelatedIntangibleAssetsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
   
Receivable from sale of intangible assets $ 26us-gaap_OtherReceivables
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_NetworkrelatedIntangibleAssetsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
  $ 26us-gaap_OtherReceivables
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= csc_NetworkrelatedIntangibleAssetsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember