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Defined Benefit Pension Plan Accounting Policy Change Impact on Consolidated Statement of Operations (Details) (USD $)
 3 Months Ended 9 Months Ended
Jan. 02, 2015
Dec. 27, 2013
Jan. 02, 2015
Dec. 27, 2013
Mar. 29, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Costs of services (excludes depreciation and amortization and restructuring costs) $ 2,530,000,000us-gaap_CostOfServices $ 2,261,000,000us-gaap_CostOfServices $ 7,101,000,000us-gaap_CostOfServices $ 7,015,000,000us-gaap_CostOfServices  
Selling, general and administrative 356,000,000us-gaap_SellingGeneralAndAdministrativeExpense 318,000,000us-gaap_SellingGeneralAndAdministrativeExpense 1,046,000,000us-gaap_SellingGeneralAndAdministrativeExpense 920,000,000us-gaap_SellingGeneralAndAdministrativeExpense  
Income from continuing operations before taxes (418,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 358,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 41,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 831,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments  
Taxes on income (105,000,000)us-gaap_IncomeTaxExpenseBenefit 77,000,000us-gaap_IncomeTaxExpenseBenefit 18,000,000us-gaap_IncomeTaxExpenseBenefit 227,000,000us-gaap_IncomeTaxExpenseBenefit  
Income (loss) from continuing operations (313,000,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 281,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 23,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 604,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest  
(Loss) income from discontinued operations, net of taxes 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (5,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (29,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 91,000,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax  
Net (loss) income (313,000,000)us-gaap_ProfitLoss 276,000,000us-gaap_ProfitLoss (6,000,000)us-gaap_ProfitLoss 695,000,000us-gaap_ProfitLoss  
Net income attributable to noncontrolling interest, net of tax 1,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 5,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 11,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 18,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest  
Net loss attributable to CSC common stockholders (314,000,000)us-gaap_NetIncomeLoss 271,000,000us-gaap_NetIncomeLoss (17,000,000)us-gaap_NetIncomeLoss 677,000,000us-gaap_NetIncomeLoss  
Basic EPS - Continuing operations (in dollars per share) $ (2.23)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.88us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.96us-gaap_IncomeLossFromContinuingOperationsPerBasicShare  
Basic EPS - Discontinued Operations (in dollars per share) $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.61us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare  
Diluted EPS - Continuing operations (in dollars per share) $ (2.23)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.84us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.88us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare  
Diluted EPS - Discontinued operations (in dollars per share) $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.60us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare  
Previous accounting methods [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net (loss) income     106,000,000us-gaap_ProfitLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember		    
Previous accounting methods [Member] | As previously reported [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Costs of services (excludes depreciation and amortization and restructuring costs) 2,299,000,000us-gaap_CostOfServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 2,362,000,000us-gaap_CostOfServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 6,907,000,000us-gaap_CostOfServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 7,156,000,000us-gaap_CostOfServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Selling, general and administrative 333,000,000us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 354,000,000us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 1,028,000,000us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 962,000,000us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Income from continuing operations before taxes (164,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 221,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 253,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 648,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Taxes on income 6,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 70,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 118,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 206,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Income (loss) from continuing operations (170,000,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 151,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 135,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 442,000,000us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
(Loss) income from discontinued operations, net of taxes       72,000,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Net (loss) income (170,000,000)us-gaap_ProfitLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 146,000,000us-gaap_ProfitLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 106,000,000us-gaap_ProfitLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 514,000,000us-gaap_ProfitLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Net income attributable to noncontrolling interest, net of tax       14,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Net loss attributable to CSC common stockholders (171,000,000)us-gaap_NetIncomeLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 141,000,000us-gaap_NetIncomeLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 95,000,000us-gaap_NetIncomeLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 500,000,000us-gaap_NetIncomeLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Basic EPS - Continuing operations (in dollars per share) $ (1.22)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 0.99us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 0.88us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 2.88us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Basic EPS - Discontinued Operations (in dollars per share)     $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 0.49us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Diluted EPS - Continuing operations (in dollars per share) $ (1.22)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 0.98us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 0.86us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ 2.83us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Diluted EPS - Discontinued operations (in dollars per share)   $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		   $ 0.48us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_PreviousAccountingMethodMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Impact of change in accounting methods [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Costs of services 231,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonCostofServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (101,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonCostofServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 194,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonCostofServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (141,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonCostofServices
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Selling, general and administrative expenses 23,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonSellingGeneralandAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (36,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonSellingGeneralandAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 18,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonSellingGeneralandAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (42,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonSellingGeneralandAdministrativeExpense
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Loss from continuing operations, before taxes (254,000,000)csc_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperationsBeforeTax
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 137,000,000csc_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperationsBeforeTax
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (212,000,000)csc_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperationsBeforeTax
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 183,000,000csc_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperationsBeforeTax
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Taxes on income (111,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 7,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (100,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 21,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeTaxExpenseBenefit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Loss from continuing operations (143,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 130,000,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (112,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 162,000,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnIncomeFromContinuingOperations
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Income from discontinued operations, net of taxes   0csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeLossfromDiscontinuedOperationsNetofTaxIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		   19,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonIncomeLossfromDiscontinuedOperationsNetofTaxIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Net loss (143,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 130,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (112,000,000)csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 181,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Net income attributable to noncontrolling interest, net of tax       4,000,000csc_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofChangeonNetIncomeLossNetofTaxAttributabletoNoncontrollingInterest
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Net loss attributable to CSC common stockholders (143,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 130,000,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 (112,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 177,000,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Basic EPS - Continuing operations (in dollars per share) $ (1.01)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ 0.89us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ (0.80)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ 1.08us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Basic EPS - Discontinued Operations (in dollars per share)     $ 0.00csc_NewAccountingPronouncementorChangeinAccountingPrincipleDiscontinuedOperationsEffectofChangeonBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ 0.12csc_NewAccountingPronouncementorChangeinAccountingPrincipleDiscontinuedOperationsEffectofChangeonBasicEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Diluted EPS - Continuing operations (in dollars per share) $ (1.01)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ 0.86us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ (0.78)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		 $ 1.05us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Diluted EPS - Discontinued operations (in dollars per share)   $ 0.01csc_NewAccountingPronouncementorChangeinAccountingPrincipleDiscontinuedOperationsEffectofChangeonDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		   $ 0.12csc_NewAccountingPronouncementorChangeinAccountingPrincipleDiscontinuedOperationsEffectofChangeonDilutedEarningsPerShare
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember		  
Retained Earnings [Member] | Impact of change in accounting methods [Member] | Restatement Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of change on equity from application of new accounting policy         $ 1,500,000,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= csc_ChangeinAccountingPolicyChangeinAccountingMethodMarketrelatedValuetoFairValueMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember