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Description of Business, Basis of Presentation and Significant Accounting Policies Activities Relating to Capitalized Software (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Capitalized Computer Software, Net [Roll Forward] |  |  |
Ending balance at December 31 | $ 199 us-gaap_CapitalizedComputerSoftwareNet | $ 195 us-gaap_CapitalizedComputerSoftwareNet |
Internal-Use Software |  |  |
Movement in Capitalized Computer Software, Net [Roll Forward] |  |  |
Beginning balance at January 1 | 12 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 12 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 11 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Capitalized | 7 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 6 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 6 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Amortization | (6)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | (6)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | (5)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
Ending balance at December 31 | 13 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 12 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember | 12 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_InternalUseSoftwareMember
External-Use Software |  |  |
Movement in Capitalized Computer Software, Net [Roll Forward] |  |  |
Beginning balance at January 1 | 183 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | 161 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | 129 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Capitalized | 68 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | 72 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | 75 us-gaap_CapitalizedComputerSoftwareAdditions / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Amortization | (65)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | (50)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | (43)us-gaap_CapitalizedComputerSoftwareAmortization / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember
Ending balance at December 31 | $ 186 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | $ 183 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember | $ 161 us-gaap_CapitalizedComputerSoftwareNet / tdc_CapitalizedComputerSoftwareNetByTypeAxis = tdc_ExternalUseSoftwareMember

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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