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Goodwill and Acquired Intangible Assets Gross Carrying Amount and Accumulated Amortization for Teradata Acquired Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	$ (133)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment	$ (102)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment
Gross Carrying Amount	269us-gaap_FiniteLivedIntangibleAssetsGross	251us-gaap_FiniteLivedIntangibleAssetsGross
Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(95)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	(70)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Gross Carrying Amount	186us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	153us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Customer relationships
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(35)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(23)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Gross Carrying Amount	77us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	77us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(1)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	(7)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Gross Carrying Amount	1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	15us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
In-process research and development
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years	5 years
Accumulated Amortization and Currency Translation Adjustments	(2)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember	(1)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Gross Carrying Amount	5us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember	5us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	0tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	(1)tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Gross Carrying Amount	$ 0us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	$ 1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Minimum
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)
Minimum | Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	1 year	1 year
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	3 years	3 years
Minimum | Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years	5 years
Minimum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	3 years	3 years
Maximum
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)
Maximum | Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	7 years	7 years
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	10 years	10 years

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Finite Lived Intangible Assets Accumulated Amortization And Currency Translation Adjustment

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- Definition

Amount before 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

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