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Intangible Assets - Purchased and Internally Developed Intangibles (Details) (USD $)
In Millions, unless otherwise specified
Apr. 03, 2015
Mar. 28, 2014
Finite-Lived Intangible Assets [Line Items]    
Purchased and internally developed software, net $ 1,226us-gaap_FiniteLivedIntangibleAssetsNet $ 1,350us-gaap_FiniteLivedIntangibleAssetsNet
Software    
Finite-Lived Intangible Assets [Line Items]    
Purchased and internally developed software, net 751us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 650us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Purchased software    
Finite-Lived Intangible Assets [Line Items]    
Purchased and internally developed software, net 256us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_PurchasedSoftwareMember		 287us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_PurchasedSoftwareMember
Internally developed commercial software    
Finite-Lived Intangible Assets [Line Items]    
Purchased and internally developed software, net 364us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_CommercialSoftwareProductsMember		 308us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_CommercialSoftwareProductsMember
Internally developed internal-use software    
Finite-Lived Intangible Assets [Line Items]    
Purchased and internally developed software, net $ 131us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember		 $ 55us-gaap_FiniteLivedIntangibleAssetsNet
/ csc_SoftwareAssetsByMajorClassAxis
= csc_InternalUseSoftwareMember