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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Mar. 28, 2014
Mar. 29, 2013
Mar. 30, 2012
Apr. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term Of Historical Daily Closing Price On Which Historical Volatilty Calculation Was Based In Prior Periods       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years 5 months 23 days 6 years 7 months 2 days 6 years 1 month 10 days  
Stock-based compensation expense     $ 71us-gaap_AllocatedShareBasedCompensationExpense $ 48us-gaap_AllocatedShareBasedCompensationExpense $ 36us-gaap_AllocatedShareBasedCompensationExpense  
Stock-based compensation     73us-gaap_ShareBasedCompensation 49us-gaap_ShareBasedCompensation 36us-gaap_ShareBasedCompensation  
Number of incentive plans within the employee or nonemployee plan     3csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfIncentivePlansWithinEmployeeOrNonemployeePlan      
Number of common shares available for grant at period end     18,010,857us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Information regarding stock options granted during the period [Roll Forward]            
Canceled/Forfeited (in shares)     (9,000,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod      
Aggregate disclosures [Abstract]            
Total grant date fair value of stock options vested during the period     14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Cash received from stock awards exercised during the period     214us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 55us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 15us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions  
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures     31us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Weighted average period over which cost is expected to be recognized (in years)     1 year 10 months 2 days      
Additional disclosures other than options [Abstract]            
Share Based Compensation Net Of Tax     46csc_ShareBasedCompensationNetOfTax 31csc_ShareBasedCompensationNetOfTax 23csc_ShareBasedCompensationNetOfTax  
Adjustment In Stock Compensation Expense Due To Actual Forfeiture True Up     4csc_AdjustmentInStockCompensationExpenseDueToActualForfeitureTrueUp 3csc_AdjustmentInStockCompensationExpenseDueToActualForfeitureTrueUp 5csc_AdjustmentInStockCompensationExpenseDueToActualForfeitureTrueUp  
Risk Free Interest Rate, Minimum     1.35%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum      
Risk Free Interest Rate, Maximum     2.36%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum      
Expected Volatility Rate, Minimum     33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum      
Expected Volatility Rate, Maximum     39.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum      
Current Term Of Historical Daily Closing Price On Which Historical Volatilty Calculation Was Based       7 years    
Service-based RSU's [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period - minimum (in years)     10 years      
Additional disclosures other than options [Abstract]            
Vesting Percent     10.00%csc_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingPecent
/ csc_TypeOfOtherEquityAwardAxis
= csc_ServiceBasedRsusMember
     
Minimum Service Period     10 years      
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 [Member]            
Additional disclosures other than options [Abstract]            
Award Vesting Rights, Percentage       25.00%csc_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= csc_SharebasedCompensationAwardTrancheOneMember
   
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 5 months 23 days 6 years 7 months 2 days     6 years 1 month 10 days  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     1.32%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.15%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Information regarding stock options granted during the period [Roll Forward]            
Outstanding beginning of period (in shares) 15,140,567us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,733,562us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
15,140,567us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,733,562us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,060,193us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted (in shares)     2,199,369us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3,707,172us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,457,509us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercised (in shares)     (5,015,849)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(1,497,686)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(428,844)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Canceled/Forfeited (in shares)     (1,247,511)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(1,113,422)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(579,069)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expired (in shares)     (1,246,965)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(3,689,059)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(776,227)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Outstanding end of period (in shares)     9,829,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
15,140,567us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,733,562us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,060,193us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Vested and expected to vest [Abstract]            
Vested and expected to vest in the future as of period end (in shares)     9,690,851us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Exercisable as of period end (in shares)     6,282,733us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Additional disclosures - stock options [Abstract]            
Weighted average exercise price -beginning of period (in dollars per share) $ 43.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 46.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 43.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 46.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 47.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price - granted (in dollars per share)     $ 45.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 27.46us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 38.18us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price - exercised (in dollars per share)     $ 44.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 39.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 35.95us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price - cancelled/forfeited (in dollars per share)     $ 33.89us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 35.36us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 41.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price - expired (in dollars per share)     $ 52.05us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 45.28us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 49.05us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price - end of period (in dollars per share)     $ 43.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 43.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 46.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 47.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average exercise price vested and expected to vest as of period end (in dollars per share)     $ 43.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Weighted average exercise price exercisable as of period end (in dollars per share)     $ 46.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Weighted average remaining contractual life (in years)     5 years 8 months 23 days 5 years 5 months 12 days 5 years 0 months 29 days 5 years 6 months 15 days
Weighted average remaining contractual life vested and expected to vest in the future as of period end (in years)     5 years 8 months 9 days      
Weighted average remaining contractual life exercisable as of period end (in years)     4 years 1 month 13 days      
Aggregate intrinsic value     167us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
113us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Aggregate intrinsic value vested and expected to vest in the future as of period end     164us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Aggregate intrinsic value exercisable as of period end     87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Aggregate disclosures [Abstract]            
Total intrinsic value of options exercised during the period     53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Additional disclosures other than options [Abstract]            
Expected Volatility Rate     34.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
36.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
31.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Dividend yield     1.71%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.79%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted Average Grant Date Fair Value     $ 13.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 7.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Tax Benefit from Compensation Expense     8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock Options and RSU's [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options     26us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= csc_StockOptionsAndRsusMember
 
Other stock based incentives [Member]            
Equity instruments other than options nonvested [Roll Forward]            
Equity instruments other than options nonvested - beginning balance (in shares) 2,263,272us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,740,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
2,263,272us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,740,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,478,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Equity instruments other than options nonvested - granted (in shares)     2,018,416us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,724,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,009,743us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Equity instruments other than options nonvested - released/redeemed (in shares)     (464,293)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
(423,321)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
(419,351)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Equity instruments other than options nonvested - canceled/forfeited (in shares)     (629,654)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
(778,971)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
(328,037)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Equity instruments other than options nonvested - ending balance (in shares)     3,187,741us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
2,263,272us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
1,740,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Additional disclosures other than options [Abstract]            
Weighted average fair value other than options - beginning balance (in dollars per share) $ 31.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 40.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 31.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 40.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 46.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Weighted average fair value other than options - granted (in dollars per share)     $ 49.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 26.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 35.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Weighted average fair value other than options - released/redeemed (in dollars per share)     $ 33.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 33.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 48.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Weighted average fair value other than options - canceled/forfeited (in dollars per share)     $ 38.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 38.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 41.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Weighted average fair value other than options - ending balance (in dollars per share)     $ 41.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 31.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
$ 40.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= csc_OtherEquityAwardsMember
 
Other stock based incentives [Member] | Service-based RSU's [Member]            
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
     
Total Restricted Stock Awards And Other Stock Based Incentives [Member]            
Aggregate disclosures [Abstract]            
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures     107us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= csc_RestrictedStockAwardsAndOtherStockBasedIncentivesMember
     
Weighted average period over which cost is expected to be recognized (in years)     2 years 2 months 23 days      
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
15us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
(12)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Issue price of award (in dollars per share)     $ 0csc_ShareBasedCompensationArrangementByShareBasedPaymentAwardIssuePriceOfAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Additional disclosures other than options [Abstract]            
Adjustment In Stock Compensation Expense Due To Actual Forfeiture True Up       3csc_AdjustmentInStockCompensationExpenseDueToActualForfeitureTrueUp
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Minimum | Other stock based incentives [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period - minimum (in years)       3 years    
Minimum | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period - minimum (in years)       3 years    
Maximum | Other stock based incentives [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period - minimum (in years)       5 years    
Maximum | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period - minimum (in years)       5 years    
SMI Employees [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csc_SMIEmployeesMember
     
Nonemployee Director Incentives [Member]            
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     197,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
     
Equity instruments other than options nonvested [Roll Forward]            
Equity instruments other than options nonvested - beginning balance (in shares) 188,445us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
196,361us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
188,445us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
196,361us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
158,741us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Equity instruments other than options nonvested - granted (in shares)     25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
42,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
37,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Equity instruments other than options nonvested - released/redeemed (in shares)     (29,299)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
(50,716)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
(180)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Equity instruments other than options nonvested - canceled/forfeited (in shares)     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Equity instruments other than options nonvested - ending balance (in shares)     184,146us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
188,445us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
196,361us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Additional disclosures other than options [Abstract]            
Weighted average fair value other than options - beginning balance (in dollars per share) $ 39.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 42.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 39.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 42.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 45.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Weighted average fair value other than options - granted (in dollars per share)     $ 51.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 30.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 30.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Weighted average fair value other than options - released/redeemed (in dollars per share)     $ 35.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 43.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 42.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Weighted average fair value other than options - canceled/forfeited (in dollars per share)     $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Weighted average fair value other than options - ending balance (in dollars per share)     $ 42.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 39.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
$ 42.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csc_NonemployeeDirectorIncentivesMember
 
Cost Of Services [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     25us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember
22us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember
15us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember
 
Allocated Share Based Compensation Expense Selling General And Administrative [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     $ 48us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember
$ 27us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember
$ 21us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember
 
Fiscal 2013 and Thereafter [Member] | Service-based RSU's [Member]            
Additional disclosures other than options [Abstract]            
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 [Member]            
Additional disclosures other than options [Abstract]            
Minimum Service Period       10 years    
Prior to Fiscal Year 2013 [Member] | Service-based RSU's [Member]            
Additional disclosures other than options [Abstract]            
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