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Segment and Geographic Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Segment Reporting Information [Line Items]      
Revenues $ 12,173us-gaap_Revenues $ 12,998us-gaap_Revenues $ 14,195us-gaap_Revenues
Operating income (loss) 1,088us-gaap_OperatingIncomeLoss [1] 1,416us-gaap_OperatingIncomeLoss [1] 961us-gaap_OperatingIncomeLoss [1]
Depreciation and amortization 977us-gaap_DepreciationAndAmortization 1,018us-gaap_DepreciationAndAmortization 1,070us-gaap_DepreciationAndAmortization
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Operating income (loss) 1,088us-gaap_OperatingIncomeLoss [1] 1,416us-gaap_OperatingIncomeLoss [1] 961us-gaap_OperatingIncomeLoss [1]
Corporate G&A (242)csc_CorporateGeneralAndAdministrativeExpense (263)csc_CorporateGeneralAndAdministrativeExpense (293)csc_CorporateGeneralAndAdministrativeExpense
Pension Expense, Fair Value Adjustment (782)csc_PensionExpenseFairValueAdjustment 259csc_PensionExpenseFairValueAdjustment (297)csc_PensionExpenseFairValueAdjustment
SEC Settlement related charges and other (200)csc_LitigationSettlementandOtherCosts [2] 0csc_LitigationSettlementandOtherCosts [2] 0csc_LitigationSettlementandOtherCosts [2]
Interest expense (148)us-gaap_InterestExpense (147)us-gaap_InterestExpense (183)us-gaap_InterestExpense
Interest income 20us-gaap_InterestIncomeOperating 16us-gaap_InterestIncomeOperating 22us-gaap_InterestIncomeOperating
Other income (expense), net (12)us-gaap_OtherCostAndExpenseOperating (18)us-gaap_OtherCostAndExpenseOperating 25us-gaap_OtherCostAndExpenseOperating
(Loss) income from continuing operations, before taxes (276)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,263us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 235us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Increase in operating income from change in accounting policy 263us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults 94us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults 83us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnOperatingResults
GBS Segment      
Segment Reporting Information [Line Items]      
Revenues 4,036us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 4,321us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 4,844us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
Operating income (loss) 405us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 574us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 401us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
Depreciation and amortization 149us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 152us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 176us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Operating income (loss) 405us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 574us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember		 401us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GBSSegmentMember
GIS Segment | Segment As Reported      
Segment Reporting Information [Line Items]      
Revenues 4,080us-gaap_Revenues
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 4,578us-gaap_Revenues
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 4,689us-gaap_Revenues
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
Operating income (loss) 162us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 382us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 162us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
Depreciation and amortization 673us-gaap_DepreciationAndAmortization
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 704us-gaap_DepreciationAndAmortization
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 722us-gaap_DepreciationAndAmortization
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Operating income (loss) 162us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 382us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember		 162us-gaap_OperatingIncomeLoss
/ csc_SegmentReportingInformationSegmentsAffectedByOutOfPeriodAdjustmentsAxis
= csc_SegmentAsReportedMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_GISSegmentMember
NPS Segment      
Segment Reporting Information [Line Items]      
Revenues 4,057us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 4,099us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 4,662us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
Operating income (loss) 591us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 524us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 511us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
Depreciation and amortization 137us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 148us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 158us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Operating income (loss) 591us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 524us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember		 511us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NpsMember
Corporate      
Segment Reporting Information [Line Items]      
Revenues 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Operating income (loss) (70)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 (64)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 (113)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Depreciation and amortization 18us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 14us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 14us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Operating income (loss) $ (70)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ (64)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ (113)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
[1] The impact of the change in pension accounting policy was an increase in operating income of $263 million, $94 million, and $83 million for the twelve months ended April 3, 2015, March 28, 2014, and March 29, 2013, respectively.
[2] This item primarily relates to the SEC investigation settlement (see Note 2).