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Segment and Geographic Information 3 (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Customer
Mar. 31, 2014
Customer
Mar. 31, 2013
Customer
Segment Reporting Information, Additional Information [Abstract]      
Number of customers accounting for 10% or more of total revenue 0ca_NumberOfCustomersAccountingForTenPercentOrMoreOfTotalRevenue 0ca_NumberOfCustomersAccountingForTenPercentOrMoreOfTotalRevenue 0ca_NumberOfCustomersAccountingForTenPercentOrMoreOfTotalRevenue
Purchased Software      
Segment Reporting Information [Line Items]      
Impairment   0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ca_PurchasedSoftwareProductsMember
55us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ca_PurchasedSoftwareProductsMember
Fiscal 2014 Plan      
Segment Reporting Information [Line Items]      
Rebalancing charges   168us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= ca_FiscalYear2014RebalancingPlanMember
 
Mainframe Solutions      
Segment Reporting Information [Line Items]      
Severance costs     3us-gaap_SeveranceCosts1
/ us-gaap_StatementBusinessSegmentsAxis
= ca_MainframeSolutionsMember
Mainframe Solutions | Fiscal 2015 Severance Actions      
Segment Reporting Information [Line Items]      
Severance costs 17us-gaap_SeveranceCosts1
/ us-gaap_RestructuringPlanAxis
= ca_Fiscal2015SeveranceActionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ca_MainframeSolutionsMember
   
Enterprise Solutions      
Segment Reporting Information [Line Items]      
Intellectual property assets transaction value     35ca_IntellectualPropertyAssetsTransactionValue
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
Severance costs     10us-gaap_SeveranceCosts1
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
Impairment 21us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
   
Enterprise Solutions | Purchased Software      
Segment Reporting Information [Line Items]      
Impairment 12us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ca_PurchasedSoftwareProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
  55us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ca_PurchasedSoftwareProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
Enterprise Solutions | Fiscal 2015 Severance Actions      
Segment Reporting Information [Line Items]      
Severance costs 15us-gaap_SeveranceCosts1
/ us-gaap_RestructuringPlanAxis
= ca_Fiscal2015SeveranceActionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ca_EnterpriseSolutionsMember
   
Services      
Segment Reporting Information [Line Items]      
Severance costs     2us-gaap_SeveranceCosts1
/ us-gaap_StatementBusinessSegmentsAxis
= ca_ServicesMember
Services | Fiscal 2015 Severance Actions      
Segment Reporting Information [Line Items]      
Severance costs 8us-gaap_SeveranceCosts1
/ us-gaap_RestructuringPlanAxis
= ca_Fiscal2015SeveranceActionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ca_ServicesMember