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Employee Benefit Plans Summary of Changes in Fair Value of Pension Plan Level 3 Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Insurance Contracts Pension Plan Assets Fair Value [Roll Forward]
Balance as of January 1	$ 10tdc_InsuranceContractsPensionPlanAssetsFairValue	$ 8tdc_InsuranceContractsPensionPlanAssetsFairValue
Purchases, sales and settlements, net	1us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements	2us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
Balance as of December 31	$ 11tdc_InsuranceContractsPensionPlanAssetsFairValue	$ 10tdc_InsuranceContractsPensionPlanAssetsFairValue

X

- Definition

Insurance contracts pension plan assets fair value.

+ References

No definition available.

+ Details

Name:	tdc_InsuranceContractsPensionPlanAssetsFairValue
Namespace Prefix:	tdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	tdc_InsuranceContractsPensionPlanAssetsFairValueRollForward
Namespace Prefix:	tdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration