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Defined Benefit Pension Plan Accounting Policy Change Impact on Consolidated Statement of Comprehensive Income (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net (loss) income $ (313)us-gaap_ProfitLoss $ 276us-gaap_ProfitLoss $ (6)us-gaap_ProfitLoss $ 695us-gaap_ProfitLoss
Foreign currency translation adjustments (90)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (9)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (189)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (93)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Pension and other post-retirement benefit plans, net of taxes 52us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 260us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 48us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 260us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive loss, net of taxes (40)us-gaap_OtherComprehensiveIncomeLossNetOfTax 251us-gaap_OtherComprehensiveIncomeLossNetOfTax (149)us-gaap_OtherComprehensiveIncomeLossNetOfTax 167us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (353)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 527us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest (155)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 862us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive income attributable to noncontrolling interest 1us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 5us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 11us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 27us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to CSC common stockholders (354)us-gaap_ComprehensiveIncomeNetOfTax 522us-gaap_ComprehensiveIncomeNetOfTax (166)us-gaap_ComprehensiveIncomeNetOfTax 835us-gaap_ComprehensiveIncomeNetOfTax
Previous accounting methods [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net (loss) income     106us-gaap_ProfitLoss
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Previous accounting methods [Member] | As previously reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net (loss) income (170)us-gaap_ProfitLoss
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Foreign currency translation adjustments (78)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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(3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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(168)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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(90)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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Pension and other post-retirement benefit plans, net of taxes (103)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
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(85)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
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Other comprehensive loss, net of taxes (183)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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(261)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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370us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Comprehensive income   542us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
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  884us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
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Comprehensive income attributable to noncontrolling interest   5us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
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Comprehensive income attributable to CSC common stockholders   537us-gaap_ComprehensiveIncomeNetOfTax
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  866us-gaap_ComprehensiveIncomeNetOfTax
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Impact of change in accounting methods [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net loss (143)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
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(112)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
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Foreign currency translation adjustments (12)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonOtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentNetofTax
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Pension and other post-retirement benefit plans, net of taxes 155csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansAdjustmentNetofTax
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(200)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansAdjustmentNetofTax
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Comprehensive income   (15)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNoncontrollingInterest
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Comprehensive income attributable to CSC common stockholders   $ (15)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonComprehensiveIncomeLossNetofTaxAttributabletoParent
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