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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 68us-gaap_ShareBasedCompensation $ 73us-gaap_ShareBasedCompensation $ 49us-gaap_ShareBasedCompensation
Share-based compensation, net of tax 43csc_ShareBasedCompensationNetOfTax 46csc_ShareBasedCompensationNetOfTax 31csc_ShareBasedCompensationNetOfTax
Cost of services      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation 19us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember		 25us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember		 22us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_CostOfServicesMember
Selling, general and administrative      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation $ 49us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember		 $ 48us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember		 $ 27us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= csc_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrativeMember