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Goodwill and Acquired Intangible Assets - Gross Carrying Amount and Accumulated Amortization for Teradata Acquired Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 280	$ 269
Accumulated Amortization and Currency Translation Adjustments	(166)	(133)
Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	197	186
Accumulated Amortization and Currency Translation Adjustments	(120)	(95)
Customer relationships
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	77	77
Accumulated Amortization and Currency Translation Adjustments	$ (42)	$ (35)
Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years	5 years
Gross Carrying Amount	$ 1	$ 1
Accumulated Amortization and Currency Translation Adjustments	$ (1)	$ (1)
In-process research and development
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years	5 years
Gross Carrying Amount	$ 5	$ 5
Accumulated Amortization and Currency Translation Adjustments	$ (3)	$ (2)
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
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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- Definition

Finite Lived Intangible Assets Accumulated Amortization And Currency Translation Adjustment

+ References

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- Definition

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+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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