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Income Taxes Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets    
Employee pensions and other liabilities $ 61us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits $ 57us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other balance sheet reserves and allowances 22us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 22us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Tax loss and credit carryforwards 59us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 41us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred revenue 0us-gaap_DeferredTaxAssetsDeferredIncome 2us-gaap_DeferredTaxAssetsDeferredIncome
Capitalized research and development 0tdc_DeferredTaxAssetsCapitalizedResearchAndDevelopment 5tdc_DeferredTaxAssetsCapitalizedResearchAndDevelopment
Other 0us-gaap_DeferredTaxAssetsOther 1us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 142us-gaap_DeferredTaxAssetsGross 128us-gaap_DeferredTaxAssetsGross
Valuation allowance (20)us-gaap_DeferredTaxAssetsValuationAllowance (13)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 122us-gaap_DeferredTaxAssetsNet 115us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities    
Intangibles and capitalized software 102us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware 117us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware
Property and equipment 29us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 29us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred revenue 17us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 0us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Other 12us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities 160us-gaap_DeferredTaxLiabilities 146us-gaap_DeferredTaxLiabilities
Total net deferred income tax liabilities $ (38)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (31)us-gaap_DeferredTaxAssetsLiabilitiesNet