Long-Lived Assets 2 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Capitalized software and other intangible assets
Gross amortizable assets	$ 8,039	$ 8,113
Less: Fully amortized assets	6,250	6,095
Remaining amortizable assets	1,789	2,018
Accumulated amortization on remaining amortizable assets	1,058	955
Net assets	731us-gaap_FiniteLivedIntangibleAssetsNet	1,063us-gaap_FiniteLivedIntangibleAssetsNet
Purchased Software Products
Capitalized software and other intangible assets
Gross amortizable assets	5,717	5,706
Less: Fully amortized assets	4,859	4,849
Remaining amortizable assets	858	857
Accumulated amortization on remaining amortizable assets	413	309
Net assets	445	548
Internally Developed Software Products
Capitalized software and other intangible assets
Gross amortizable assets	1,486	1,561
Less: Fully amortized assets	835	757
Remaining amortizable assets	651	804
Accumulated amortization on remaining amortizable assets	414	397
Net assets	237	407
Other Intangible Assets
Capitalized software and other intangible assets
Gross amortizable assets	836	846
Less: Fully amortized assets	556	489
Remaining amortizable assets	280	357
Accumulated amortization on remaining amortizable assets	231	249
Net assets	$ 49	$ 108

Finite-lived intangible assets, accumulated amortization on remaining amortizable assets.

No definition available.

Name:	ca_FiniteLivedIntangibleAssetsAccumulatedAmortizationOnRemainingAmortizableAssets
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Finite-lived intangible assets, remaining amortizable assets.

+ References

No definition available.

+ Details

Name:	ca_FiniteLivedIntangibleAssetsRemainingAmortizableAssets
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Details

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

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=ca_InternallyDevelopedSoftwareProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=ca_PurchasedSoftwareProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: