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Description of Business, Basis of Presentation and Significant Accounting Policies Activities Relating to Capitalized Software (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Capitalized Computer Software, Net [Roll Forward]
Ending balance at December 31	$ 199us-gaap_CapitalizedComputerSoftwareNet	$ 195us-gaap_CapitalizedComputerSoftwareNet
Internal-Use Software
Movement in Capitalized Computer Software, Net [Roll Forward]
Beginning balance at January 1	12us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	12us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	11us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Capitalized	7us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	6us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	6us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Amortization	(6)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	(6)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	(5)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Ending balance at December 31	13us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	12us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember	12us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
External-Use Software
Movement in Capitalized Computer Software, Net [Roll Forward]
Beginning balance at January 1	183us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	161us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	129us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Capitalized	68us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	72us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	75us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Amortization	(65)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	(50)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	(43)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Ending balance at December 31	$ 186us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	$ 183us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember	$ 161us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember

X

- Definition

Additions made to capitalized computer software costs during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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Balance Type:	debit
Period Type:	duration

X

- Definition

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

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- Definition

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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