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Employee Benefit Plans Schedule of Pension Plan Assets at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Money market funds	$ 2tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue	$ 3tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue
Equity funds	21tdc_EquityFundsPensionPlanAssetsFairValue	26tdc_EquityFundsPensionPlanAssetsFairValue
Bond/fixed-income funds	28tdc_BondFixedIncomePensionPlanAssetsFairValue	28tdc_BondFixedIncomePensionPlanAssetsFairValue
Real-estate indirect investment	4tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue	5tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue
Commodities/Other	1tdc_CommoditiesOtherPensionPlanAssetsFairValue	4tdc_CommoditiesOtherPensionPlanAssetsFairValue
Insurance contracts	11tdc_InsuranceContractsPensionPlanAssetsFairValue	10tdc_InsuranceContractsPensionPlanAssetsFairValue	8tdc_InsuranceContractsPensionPlanAssetsFairValue
Total Assets at fair value	67us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	76us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	0tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity funds	0tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Bond/fixed-income funds	0tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Real-estate indirect investment	0tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Commodities/Other	0tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Insurance contracts	0tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total Assets at fair value	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	2tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	3tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Equity funds	21tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	26tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Bond/fixed-income funds	28tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	28tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Real-estate indirect investment	4tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	5tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Commodities/Other	1tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	4tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Insurance contracts	0tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total Assets at fair value	56us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	66us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Money market funds	0tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0tdc_CashAndCashEquivalentsAndMoneyMarketFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Equity funds	0tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0tdc_EquityFundsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Bond/fixed-income funds	0tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0tdc_BondFixedIncomePensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Real-estate indirect investment	0tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0tdc_RealEstateIndirectInvestmentPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Commodities/Other	0tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0tdc_CommoditiesOtherPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Insurance contracts	11tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	10tdc_InsuranceContractsPensionPlanAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total Assets at fair value	$ 11us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 10us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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Bond fixed income pension plan assets fair value.

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- Definition

Cash and cash equivalents and money market funds pension plan assets fair value.

+ References

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- Definition

Commodities other pension plan assets fair value.

+ References

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- Definition

Equity funds pension plan assets fair value.

+ References

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- Definition

Insurance contracts pension plan assets fair value.

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- Definition

Real estate indirect investment pension plan assets fair value.

+ References

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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