v2.3.0.11

Business Combinations (Unaudited Supplemental Financial Information) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Revenue	$ 28
Net Income	(7)
Acquisition [Member] | Pro forma condensed combined [Member]
Revenue	1,107	935
Net income	$ 162	$ 117

X

- Definition

Business Combination Actual Impact From Acquired Entity Net Income Loss

+ Details

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Namespace Prefix:	tdc
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Combination Actual Impact From Acquired Entity Revenues

+ Details

Name:	tdc_BusinessCombinationActualImpactFromAcquiredEntityRevenues
Namespace Prefix:	tdc
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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Namespace Prefix:	us-gaap
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