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Employee Benefit Plans Estimated Future Benefit Payments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Postemployment Benefits  
2015 $ 5tdc_PostemploymentBenefitExpectedFuturePaymentsNextTwelveMonths
2016 5tdc_PostemploymentBenefitExpectedFuturePaymentsYearTwo
2017 5tdc_PostemploymentBenefitExpectedFuturePaymentsYearThree
2018 5tdc_PostemploymentBenefitExpectedFuturePaymentsYearFour
2019 5tdc_PostemploymentBenefitExpectedFuturePaymentsYearFive
2020-2024 23tdc_PostemploymentBenefitExpectedFuturePaymentsFiveFiscalYearsThereafter
Foreign Pension Plan  
Pension Benefits  
2015 3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2016 5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2017 6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2018 6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2019 5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2020-2024 $ 32us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember