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Revenue from Contracts with Customers - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract] |
Deferred revenue, revenue recognized | $ 182
Remaining performance obligation, amount of customer only general cancellation | 1,674
Remaining performance obligation, amount of non-cancelable contracts | $ 373

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- Definition Revenue, Remaining Performance Obligation, Amount of Customer Only General Cancellation + References No definition available. + Details
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Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revenue, Remaining Performance Obligation, Amount of Non-Cancelable Contracts + References No definition available. + Details
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Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration