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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, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 46	$ 77
Accumulated Amortization and Currency Translation Adjustments	(23)	(66)
Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	41	71
Accumulated Amortization and Currency Translation Adjustments	$ (18)	$ (61)
Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years	5 years
Gross Carrying Amount	$ 0	$ 1
Accumulated Amortization and Currency Translation Adjustments	$ 0	$ (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	$ (5)	$ (4)
Minimum | Intellectual property/developed technology
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)	5 years	5 years

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- Definition

Finite Lived Intangible Assets Accumulated Amortization And Currency Translation Adjustment

+ 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=66006027&loc=d3e16323-109275

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