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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 |

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- Definition Finite Lived Intangible Assets Accumulated Amortization And Currency Translation Adjustment + References No definition available. + Details
Name: | tdc_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndCurrencyTranslationAdjustment
Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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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 No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration