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Segment, Other Supplemental Information and Concentrations Schedule of Property and Equipment by Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Identifiable Assets By Segment [Line Items]
Property and equipment, net	$ 159us-gaap_PropertyPlantAndEquipmentNet	$ 161us-gaap_PropertyPlantAndEquipmentNet
United States
Schedule Of Identifiable Assets By Segment [Line Items]
Property and equipment, net	130us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_UnitedStatesMember	131us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_UnitedStatesMember
Americas (excluding United States)
Schedule Of Identifiable Assets By Segment [Line Items]
Property and equipment, net	4us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionExcludingUnitedStatesMember	3us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_NorthAmericaAndLatinAmericaRegionExcludingUnitedStatesMember
International
Schedule Of Identifiable Assets By Segment [Line Items]
Property and equipment, net	$ 25us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember	$ 27us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = tdc_InternationalMember

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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