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Income Taxes Effective Tax Rate Reconciliation, Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Income Tax Rate Reconciliation [Line Items]      
SEC settlement $ (190)csc_EffectiveIncomeTaxRateReconciliationLitigationSettlementAmount    
Effective tax rate reconciliation, litigation settlement, amount 73us-gaap_IncomeTaxReconciliationTaxSettlements    
Effective income tax rate reconciliation, litigation settlement (in hundredths) 26.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Effective income tax rate reconciliation, change in valuation allowance (in hundredths) 32.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (11.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 175.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income tax (benefit) expense 312us-gaap_IncomeTaxExpenseBenefit (383)us-gaap_IncomeTaxExpenseBenefit 62us-gaap_IncomeTaxExpenseBenefit
Effective tax rate reconciliation, other items, net (in hundredths) 4.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate reconciliation, increase in uncertain tax positions 12us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 10us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 8us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Effective tax rate reconciliation, change in uncertain tax positions (in hundredths) 0.60%csc_EffectiveIncomeTaxRateChangeInUncertainTaxPositions 2.90%csc_EffectiveIncomeTaxRateChangeInUncertainTaxPositions 2.40%csc_EffectiveIncomeTaxRateChangeInUncertainTaxPositions
Effective income tax rate reconciliation, disposition of asset     11.5csc_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceDispositionofAssetAmount
Effective income tax rate reconciliation, disposition of asset (in hundredths)     4.90%csc_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceDispositionofAssetPercent
Other Restructuring      
Income Tax Rate Reconciliation [Line Items]      
Income tax (benefit) expense   (10)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
248us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Effective tax rate reconciliation, other items, net (in hundredths)   (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
105.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Gain (loss) on sale of asset     (640)us-gaap_GainLossOnDispositionOfAssets1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Transfer Pricing and Foreign Income Inclusions and Exchange Losses      
Income Tax Rate Reconciliation [Line Items]      
Effective tax rate reconciliation, increase in uncertain tax positions   36us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_TransferPricingandForeignIncomeInclusionsandExchangeLossesMember
76us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_TransferPricingandForeignIncomeInclusionsandExchangeLossesMember
Effective tax rate reconciliation, change in uncertain tax positions (in hundredths)   2.90%csc_EffectiveIncomeTaxRateChangeInUncertainTaxPositions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_TransferPricingandForeignIncomeInclusionsandExchangeLossesMember
32.30%csc_EffectiveIncomeTaxRateChangeInUncertainTaxPositions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_TransferPricingandForeignIncomeInclusionsandExchangeLossesMember
Global Health      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, change in valuation allowance, amount   58.0csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_GlobalHealthMember
 
Effective income tax rate reconciliation, change in valuation allowance (in hundredths)   4.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_GlobalHealthMember
 
Investment Recoveries      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, change in valuation allowance, amount (325.0)csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
90.6csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
(240.5)csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
Effective income tax rate reconciliation, change in valuation allowance (in hundredths) (117.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
7.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
(102.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_InvestmentRecoveriesMember
Foreign Tax Rate Differential      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, change in valuation allowance, amount   90.6csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_ForeignTaxRateDifferentialMember
240.5csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_ForeignTaxRateDifferentialMember
Effective income tax rate reconciliation, change in valuation allowance (in hundredths)   7.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_ForeignTaxRateDifferentialMember
102.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= csc_ForeignTaxRateDifferentialMember
State and Local Jurisdiction      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, losses and credits not expected to be utilized     29.6csc_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceLossesandCreditsNotExpectedtoBeUtilizedAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
Effective income tax rate reconciliation, losses and credits not expected to be utilized (in hundredths)     12.60%csc_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceLossesandCreditsNotExpectedtoBeUtilizedPercent
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
United Kingdom | Foreign Tax Authority      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, change in valuation allowance, amount 235.0csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_GB
   
Effective income tax rate reconciliation, change in valuation allowance (in hundredths) 85.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_GB
   
Germany | Foreign Tax Authority      
Income Tax Rate Reconciliation [Line Items]      
Effective income tax rate reconciliation, change in valuation allowance, amount     $ 77.0csc_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowanceAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_DE
Effective income tax rate reconciliation, change in valuation allowance (in hundredths)     32.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_DE