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Goodwill and Acquired Intangible Assets Goodwill by Operating Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Goodwill
December 31, 2013	$ 946us-gaap_Goodwill
Additions	30us-gaap_GoodwillAcquiredDuringPeriod
Currency Translation Adjustments	(28)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
December 31, 2014	948us-gaap_Goodwill
Americas
Goodwill
December 31, 2013	626us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionMember
Additions	30us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionMember
Currency Translation Adjustments	(2)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionMember
December 31, 2014	654us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionMember
International
Goodwill
December 31, 2013	320us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember
Additions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember
Currency Translation Adjustments	(26)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember
December 31, 2014	$ 294us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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- Details

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X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Details

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Namespace Prefix:
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X

- Details

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