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Goodwill and Acquired Intangible Assets Additional Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014
Goodwill [Line Items] |
Fully amortized intangible assets | $ 21 tdc_IntangibleAssetsFullyAmortizedAssetsRemoved
Series of Individually Immaterial Business Acquisitions |
Goodwill [Line Items] |
Increase to gross carrying amount of acquired intangible assets | $ 39 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember

X
- Definition Intangible Assets, Fully Amortized Assets Removed + References No definition available. + Details
Name: | tdc_IntangibleAssetsFullyAmortizedAssetsRemoved
Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |