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Accounting for Share-Based Compensation 6 (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]            
Capitalized share-based compensation costs $ 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 0us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount    
Stock options issued     0.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 1.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Computation of expected life, Simplified method     The Company’s computation of expected life was determined based on the simplified method (the average of the vesting period and option term).      
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of stock closing price on last day of offer period that ESPP participants can purchase Company stock         95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Number of shares issued under ESPP         0.1us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
0.1us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Share price issued under ESPP (in dollars per share)         $ 28.93ca_StockIssuedDuringPeriodPricePerShareEmployeeStockPurchasePlan
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
$ 27.30ca_StockIssuedDuringPeriodPricePerShareEmployeeStockPurchasePlan
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Number of shares available for future issuances under ESPP 29.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
  29.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
  29.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
1-Year PSU Awards [Member] | Grant Date [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage     34.00%ca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= ca_GrantDateMember
     
1-Year PSU Awards [Member] | First Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage     33.00%ca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= ca_FirstAnniversaryMember
     
1-Year PSU Awards [Member] | Second Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage     33.00%ca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= ca_SecondAnniversaryMember
     
Share-Based Awards Under Sales Retention Equity Programs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period from grant date (in years)     3 years