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Employee Benefit Plans Summary of Changes in Fair Value of Pension Plan Level 3 Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Insurance Contracts Pension Plan Assets Fair Value [Roll Forward] |  |
Balance as of January 1 | $ 10 | $ 11
Purchases, sales and settlements, net | 1 | (1)
Balance as of December 31 | $ 11 | $ 10

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- Definition Insurance contracts pension plan assets fair value. + References No definition available. + Details
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Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance Contracts Pension Plan Assets Fair Value [Roll Forward] + References No definition available. + Details
Name: | tdc_InsuranceContractsPensionPlanAssetsFairValueRollForward
Namespace Prefix: | tdc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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=65897934&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=65897934&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration