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Gross Carrying Amount and Accumulated Amortization for Teradata Acquired Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	$ (102)	$ (65)
Gross Carrying Amount	251	251
Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(70)	(48)
Gross Carrying Amount	153	153
Customer relationships
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(23)	(14)
Gross Carrying Amount	77	77
Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(7)	(2)
Gross Carrying Amount	15	15
In-process research and development
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years
Accumulated Amortization and Currency Translation Adjustments	(1)	0
Gross Carrying Amount	5	5
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Accumulated Amortization and Currency Translation Adjustments	(1)	(1)
Gross Carrying Amount	$ 1	$ 1
Minimum
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	1 year
Minimum | Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	1 year
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	3 years
Minimum | Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	1 year
Minimum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	1 year
Maximum
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	10 years
Maximum | Intellectual property/developed technology
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	7 years
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	10 years
Maximum | Trademarks/trade names
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	5 years
Maximum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Amortization Life (in Years)	3 years

X

- Definition

Finite Lived Intangible Assets Accumulated Amortization And Currency Translation Adjustment

+ References

No definition available.

+ Details

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Namespace Prefix:	tdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- 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

+ Details

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

X

- 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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration