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Employee Benefit Plans U.S and International Subsidiary Savings Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. savings plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 23us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_UnitedStatesSavingsPlanCostMember	$ 23us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_UnitedStatesSavingsPlanCostMember	$ 21us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_UnitedStatesSavingsPlanCostMember
International subsidiary savings plans
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 18us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_InternationalSubsidiarySavingsPlanCostMember	$ 17us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_InternationalSubsidiarySavingsPlanCostMember	$ 18us-gaap_DefinedContributionPlanCostRecognized / tdc_SavingsPlansAxis = tdc_InternationalSubsidiarySavingsPlanCostMember

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Balance Type:
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