<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.1.9</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>213</ContextCount>
  <ElementCount>282</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>59</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingPolicies</Role>
      <ShortName>Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Divestitures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Divestitures</Role>
      <ShortName>Divestitures</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Severance and Exit Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SeveranceAndExitCosts</Role>
      <ShortName>Severance and Exit Costs</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Trade Accounts Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/TradeAccountsReceivable</Role>
      <ShortName>Trade Accounts Receivable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Deferred Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DeferredRevenue</Role>
      <ShortName>Deferred Revenue</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Derivatives</Role>
      <ShortName>Derivatives</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/StockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Income From Continuing Operations Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/IncomeFromContinuingOperationsPerCommonShare</Role>
      <ShortName>Income From Continuing Operations Per Common Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Accounting for Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation</Role>
      <ShortName>Accounting for Share-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Supplemental Statement of Cash Flows Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SupplementalStatementOfCashFlowsInformation</Role>
      <ShortName>Supplemental Statement of Cash Flows Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingPoliciesPolicies</Role>
      <ShortName>Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Divestitures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DivestituresTables</Role>
      <ShortName>Divestitures (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - Severance and Exit Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SeveranceAndExitCostsTables</Role>
      <ShortName>Severance and Exit Costs (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Trade Accounts Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/TradeAccountsReceivableTables</Role>
      <ShortName>Trade Accounts Receivable (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Deferred Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DeferredRevenueTables</Role>
      <ShortName>Deferred Revenue (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Derivatives (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DerivativesTables</Role>
      <ShortName>Derivatives (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Income From Continuing Operations Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/IncomeFromContinuingOperationsPerCommonShareTables</Role>
      <ShortName>Income From Continuing Operations Per Common Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Accounting for Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensationTables</Role>
      <ShortName>Accounting for Share-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Supplemental Statement of Cash Flows Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SupplementalStatementOfCashFlowsInformationTables</Role>
      <ShortName>Supplemental Statement of Cash Flows Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2401402 - Disclosure - Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingPoliciesDetails</Role>
      <ShortName>Accounting Policies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - Divestitures 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Divestitures1Details</Role>
      <ShortName>Divestitures 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - Divestitures 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Divestitures2Details</Role>
      <ShortName>Divestitures 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Severance and Exit Costs 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SeveranceAndExitCosts1Details</Role>
      <ShortName>Severance and Exit Costs 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - Severance and Exit Costs 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SeveranceAndExitCosts2Details</Role>
      <ShortName>Severance and Exit Costs 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Trade Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/TradeAccountsReceivableDetails</Role>
      <ShortName>Trade Accounts Receivable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets1Details</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets2Details</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets3Details</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets 3 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2405405 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets4Details</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets 4 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Deferred Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DeferredRevenueDetails</Role>
      <ShortName>Deferred Revenue (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2407401 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Derivatives 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Derivatives1Details</Role>
      <ShortName>Derivatives 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Derivatives 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/Derivatives2Details</Role>
      <ShortName>Derivatives 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Fair Value Measurements 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/FairValueMeasurements1Details</Role>
      <ShortName>Fair Value Measurements 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Fair Value Measurements 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/FairValueMeasurements2Details</Role>
      <ShortName>Fair Value Measurements 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2409404 - Disclosure - Fair Value Measurements 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/FairValueMeasurements3Details</Role>
      <ShortName>Fair Value Measurements 3 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2410401 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Stockholders' Equity 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/StockholdersEquity1Details</Role>
      <ShortName>Stockholders' Equity 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Stockholders' Equity 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/StockholdersEquity2Details</Role>
      <ShortName>Stockholders' Equity 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Income From Continuing Operations Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/IncomeFromContinuingOperationsPerCommonShareDetails</Role>
      <ShortName>Income From Continuing Operations Per Common Share (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Accounting for Share-Based Compensation 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation1Details</Role>
      <ShortName>Accounting for Share-Based Compensation 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Accounting for Share-Based Compensation 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation2Details</Role>
      <ShortName>Accounting for Share-Based Compensation 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2413404 - Disclosure - Accounting for Share-Based Compensation 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation3Details</Role>
      <ShortName>Accounting for Share-Based Compensation 3 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2413405 - Disclosure - Accounting for Share-Based Compensation 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation4Details</Role>
      <ShortName>Accounting for Share-Based Compensation 4 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2413406 - Disclosure - Accounting for Share-Based Compensation 5 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation5Details</Role>
      <ShortName>Accounting for Share-Based Compensation 5 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2413407 - Disclosure - Accounting for Share-Based Compensation 6 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/AccountingForShareBasedCompensation6Details</Role>
      <ShortName>Accounting for Share-Based Compensation 6 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2414401 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Supplemental Statement of Cash Flows Information 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SupplementalStatementOfCashFlowsInformation1Details</Role>
      <ShortName>Supplemental Statement of Cash Flows Information 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2415403 - Disclosure - Supplemental Statement of Cash Flows Information 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SupplementalStatementOfCashFlowsInformation2Details</Role>
      <ShortName>Supplemental Statement of Cash Flows Information 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - Segment Information 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SegmentInformation1Details</Role>
      <ShortName>Segment Information 1 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2416403 - Disclosure - Segment Information 2 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SegmentInformation2Details</Role>
      <ShortName>Segment Information 2 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2416404 - Disclosure - Segment Information 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ca.com/role/SegmentInformation3Details</Role>
      <ShortName>Segment Information 3 (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Columns in Cash Flows statement 'Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)' have maximum duration 274 days and at least 41 values. Shorter duration columns must have at least one fourth (10) as many values. Column '10/1/2013 - 12/31/2013' is shorter (91 days) and has only 4 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)' have maximum duration 274 days and at least 41 values. Shorter duration columns must have at least one fourth (10) as many values. Column '10/1/2014 - 12/31/2014' is shorter (91 days) and has only 4 values, so it is being removed.</Log>
    <Log type="Info">'Monetary' elements on report '2411403 - Disclosure - Stockholders' Equity 2 (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 1001000 - Statement - Condensed Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Mar. 31, 2013'</Log>
    <Log type="Info">Process Flow-Through: 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 1002000 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 1004000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</Log>
  </Logs>
  <InputFiles>
    <File>ca-20141231.xml</File>
    <File>ca-20141231.xsd</File>
    <File>ca-20141231_cal.xml</File>
    <File>ca-20141231_def.xml</File>
    <File>ca-20141231_lab.xml</File>
    <File>ca-20141231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
