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Stock Incentive Plans - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Apr. 03, 2015
number_of_plans
Mar. 28, 2014
Mar. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of incentive plans within the employee or nonemployee plan 2csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfIncentivePlansWithinEmployeeOrNonemployeePlan    
Number of common shares available for grant at period end 15,959,036us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Risk free interest rate, minimum 1.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum    
Risk free interest rate, maximum 2.35%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum    
Expected volatility rate, minimum 30.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum    
Expected volatility rate, maximum 34.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum    
Total grant date fair value of stock options vested during the period $ 9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Cash received from stock awards exercised during the period 196us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 214us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 55us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures 28us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted average period over which cost is expected to be recognized (in years) 1 year 8 months 9 days    
Service-based RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period - minimum (in years) 10 years    
Vesting percent 10.00%csc_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingPecent
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
   
Minimum service period 10 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value (in USD per share) $ 18.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 13.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 7.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Tax benefit from stock incentive plans 18us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Award vesting rights, percentage 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Award vesting rights, number of anniversaries 3csc_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsNumberofPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Term of options 10 years    
Stock Options and RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit realized from exercise of stock options 51us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
26us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
Other stock based incentives | Service-based RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of anniversaries following the executive's termination that the shares are redeemable 10csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardRedeemableNumberofAnniversaries
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
   
Performance-based Restricted Stock Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   21us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Vesting period - minimum (in years) 3 years    
Performance-based Restricted Stock Units (PSUs) | Contingent Accelerated Vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= csc_SharebasedCompensationAwardTrancheOneMember
   
Total Restricted Stock Awards And Other Stock Based Incentives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures 78us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= csc_RestrictedStockAwardsAndOtherStockBasedIncentivesMember
   
Weighted average period over which cost is expected to be recognized (in years) 1 year 10 months 10 days    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (5)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Issue price of award (in dollars per share) $ 0csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardIssuePriceOfAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Fiscal 2015 Option | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 12us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardDateAxis
= csc_Fiscal2015OptionMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Fiscal 2013 and Thereafter | Service-based RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age covenant 62csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAgeCovenant
/ us-gaap_AwardDateAxis
= csc_Fiscal2013andThereafterMember
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
   
Vesting percent 50.00%csc_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingPecent
/ us-gaap_AwardDateAxis
= csc_Fiscal2013andThereafterMember
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
   
Age covenant, with five years of service 55csc_SharebasedCompensationArrangementbySharebasedPaymentAwardAgeCovenantwithFiveYearsofService
/ us-gaap_AwardDateAxis
= csc_Fiscal2013andThereafterMember
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
   
Minimum service period 5 years    
Prior to Fiscal Year 2013      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum service period     10 years
Prior to Fiscal Year 2013 | Service-based RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age covenant     65csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAgeCovenant
/ us-gaap_AwardDateAxis
= csc_PriortoFiscalYear2013Member
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
Age covenant, with ten years of service     55csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAgeCovenantWithTenYearsOfService
/ us-gaap_AwardDateAxis
= csc_PriortoFiscalYear2013Member
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
Minimum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period - minimum (in years) 3 years    
Maximum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period - minimum (in years) 5 years    
SMI Employees | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csc_SMIEmployeesMember
6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csc_SMIEmployeesMember
 
Nonemployee director incentives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of incentive plans within the employee or nonemployee plan 2csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfIncentivePlansWithinEmployeeOrNonemployeePlan
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
   
Number of common shares available for grant at period end 175,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
   
Workforce reductions | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ (25)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember