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

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | tdc_SavingsPlansAxis=tdc_UnitedStatesSavingsPlanCostMember
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Data Type: | na
Balance Type: |
Period Type: |