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Revenue from Contracts with Customers - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Deferred revenue, revenue recognized	$ 427
Remaining performance obligation, amount of customer only general cancellation	1,112
Remaining performance obligation, amount of non-cancelable contracts	$ 429

X

- Definition

Revenue, Remaining Performance Obligation, Amount of Customer Only General Cancellation

+ References

No definition available.

+ Details

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Namespace Prefix:	tdc_
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Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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