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Summary of Significant Accounting Policies - Change in Estimates (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 36 Months Ended
Mar. 28, 2014
Mar. 29, 2013
Mar. 30, 2012
Apr. 01, 2011
Apr. 01, 2011
Change in Accounting Estimate [Line Items]          
Gross favorable $ 125csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable $ 142csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable $ 58csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable    
Gross unfavorable (50)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable (122)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable (277)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable    
Total net adjustments, before taxes and noncontrolling interests (1) 75csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate 20csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate (219)csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate    
Impact on diluted EPS from continuing operations $ 0csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations $ (0.10)csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations $ (1.28)csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations    
NHS contract [Member] | Contracts Accounted for under Percentage of Completion, U.S. Claims [Member]          
Change in Accounting Estimate [Line Items]          
Change in accounting estimate, reduction in operating income       $ 1,158csc_ChangeInAccountingEstimateReductionInOperatingIncome
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= csc_ContractsAccountedForUnderPercentageOfCompletionUSClaimsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NhsContractMember		 $ 129csc_ChangeInAccountingEstimateReductionInOperatingIncome
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= csc_ContractsAccountedForUnderPercentageOfCompletionUSClaimsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NhsContractMember