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Business Combinations and Other Investment Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition |  |  |
Business Acquisitions And Other Investing Activities Net | $ 69 tdc_BusinessAcquisitionsAndOtherInvestingActivitiesNet | $ 36 tdc_BusinessAcquisitionsAndOtherInvestingActivitiesNet | $ 274 tdc_BusinessAcquisitionsAndOtherInvestingActivitiesNet
Equity investment arising from an impairment of carrying value | 9 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 25 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
Series of Individually Immaterial Business Acquisitions |  |  |
Business Acquisition |  |  |
Number of business acquisitions and other equity investments | 6 tdc_NumberofBusinessAcquisitionsandOtherEquityInvestments / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Business Acquisitions And Other Investing Activities Net | 69 tdc_BusinessAcquisitionsAndOtherInvestingActivitiesNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 36 tdc_BusinessAcquisitionsAndOtherInvestingActivitiesNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Number of businesses acquired |  | 2 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Number of equity investments |  | 2 tdc_NumberofEquityInvestments / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Other Nonoperating Income (Expense) |  |  |
Business Acquisition |  |  |
Gain (loss) on sale of equity investment |  | $ (3)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember |

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- Definition Business Acquisitions And Other Investing Activities Net. + References No definition available. + Details
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- Definition Number of Business Acquisitions and Other Equity Investments + References No definition available. + Details
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- Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 + Details
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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References No definition available. + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Details
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- Details
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