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

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Number of Business Acquisitions and Other Equity Investments

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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

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Amount of gain (loss) on sale or disposal of an equity method investment.

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The number of businesses acquired by the entity during the period.

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