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Employee Stock-based Compensation Plans Employee Purchases and Aggregate Cost (Details) (Employee Stock Puchase Program, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Stock Puchase Program |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Employee share purchases (in shares) | 0.4 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember | 0.4 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember | 0.2 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember
Aggregate cost | $ 18 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember | $ 20 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember | $ 12 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_ShareRepurchaseProgramAxis = tdc_EmployeeStockPuchaseProgramMember

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- Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Aggregate change in value for stock issued during the period as a result of employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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