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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
	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

X

- 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

X

- 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

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=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

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Period Type:	duration