Amount of costs incurred to date for the specified restructuring cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

Name:	us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB Topic 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringAndRelatedCostExpectedCost1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=ca_Fiscal2015SeveranceActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=ca_FiscalYear2014RebalancingPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=ca_PlansandActionsPriortoFiscal2015SeveranceActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Severance and Exit Costs 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	23 Months Ended
	Mar. 31, 2015 Employee	Mar. 31, 2015 Employee	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Restructuring and Related Activities
Accrued balance	49us-gaap_RestructuringReserve	$ 49us-gaap_RestructuringReserve	$ 84us-gaap_RestructuringReserve	$ 39us-gaap_RestructuringReserve	$ 53us-gaap_RestructuringReserve
Severance
Restructuring and Related Activities
Accrued balance	28	28	55	16	13
Facility Exit
Restructuring and Related Activities
Accrued balance	21	21	29	23	40
Fiscal 2015 Severance Actions
Restructuring and Related Activities
Expected number of employees terminated	690
Fiscal 2015 Severance Actions \| Severance
Restructuring and Related Activities
Expected cost	40	40
Fiscal 2015 Severance Actions \| Severance \| Product Development and Enhancements
Restructuring and Related Activities
Expected cost	16	16
Fiscal 2015 Severance Actions \| Severance \| Selling and Marketing
Restructuring and Related Activities
Expected cost	10	10
Fiscal 2015 Severance Actions \| Severance \| Cost of Professional Services
Restructuring and Related Activities
Expected cost	8	8
Fiscal 2015 Severance Actions \| Severance \| General and Administrative
Restructuring and Related Activities
Expected cost	5	5
Fiscal 2015 Severance Actions \| Severance \| Costs of Licensing and Maintenance
Restructuring and Related Activities
Expected cost	1	1
Fiscal 2014 Plan
Restructuring and Related Activities
Expected number of employees terminated		1,900
Expected cost	190	190
Fiscal 2014 Plan \| Severance
Restructuring and Related Activities
Cost incurred to date	166	166
Fiscal 2014 Plan \| Facility Exit
Restructuring and Related Activities
Cost incurred to date	22	22
Plans and Actions Prior to Fiscal 2015 Severance Actions \| Severance
Restructuring and Related Activities
Accrued balance	5	$ 5