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Investigations and Out of Period Adjustments (Textual) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 36 Months Ended
Jan. 02, 2015
Dec. 27, 2013
Dec. 30, 2011
Jan. 02, 2015
Dec. 27, 2013
Apr. 01, 2011
Mar. 30, 2012
Sep. 27, 2013
Jun. 28, 2013
Sep. 27, 2013
Apr. 02, 2010
Apr. 01, 2011
Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
Change in operating loss (income)     $ 1,500,000,000csc_ChangeInAccountingEstimateReductionInOperatingIncome                  
Settlement charge 195,000,000us-gaap_LitigationSettlementAmount 0us-gaap_LitigationSettlementAmount   195,000,000us-gaap_LitigationSettlementAmount 0us-gaap_LitigationSettlementAmount              
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              
Net tax benefit 105,000,000us-gaap_IncomeTaxExpenseBenefit (77,000,000)us-gaap_IncomeTaxExpenseBenefit   (18,000,000)us-gaap_IncomeTaxExpenseBenefit (227,000,000)us-gaap_IncomeTaxExpenseBenefit              
Net income attributable to CSC common stockholders 314,000,000us-gaap_NetIncomeLoss (271,000,000)us-gaap_NetIncomeLoss   17,000,000us-gaap_NetIncomeLoss (677,000,000)us-gaap_NetIncomeLoss              
Adjustment Increase/(Decrease) [Member]                        
Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
Income from continuing operations before taxes (4,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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Net tax benefit (6,000,000)us-gaap_IncomeTaxExpenseBenefit
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= us-gaap_ScenarioAdjustmentMember		     24,000,000us-gaap_IncomeTaxExpenseBenefit
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Net income attributable to CSC common stockholders 10,000,000us-gaap_NetIncomeLoss
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= us-gaap_ScenarioAdjustmentMember		   15,000,000us-gaap_NetIncomeLoss
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Miscellaneous errors [Member] | Restatement Adjustment [Member]                        
Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
Goodwill impairment           2,510,000,000us-gaap_GoodwillImpairmentLoss
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Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
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Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
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Adjustment to taxes recorded in period         10,000,000csc_QuantifyingMisstatementinCurrentYearFinancialStatementsIncomeTaxExpenseBenefit
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Quantifying Misstatement in Current Year Financial Statements [Line Items]                        
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