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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. 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Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. 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No authoritative reference available. false 89 2 te_PublicUtilitiesPropertyPlantAndEquipmentGas te false debit instant Carrying amount as of the balance sheet date of long-lived, depreciable gas utility plant. false false false false false false false false false false false terselabel false 1 false true false false 1041000000 1041.0 false false false 2 false true false false 1017200000 1017.2 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of long-lived, depreciable gas utility plant. No authoritative reference available. false 90 2 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 189100000 189.1 false false false 2 false true false false 303000000 303.0 false false false xbrli:monetaryItemType monetary Period end amount of construction work in progress in public utility No authoritative reference available. false 91 2 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 7536300000 7536.3 false false false 2 false true false false 7386100000 7386.1 false false false xbrli:monetaryItemType monetary Period end amount of total gross PPE No authoritative reference available. true 92 2 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation us-gaap true credit instant No definition available. false false false false false false false false false false true negated false 1 false true false false -2068600000 -2068.6 false false false 2 false true false false -1988100000 -1988.1 false false false xbrli:monetaryItemType monetary Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No authoritative reference available. false 93 2 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 5467700000 5467.7 false false false 2 false true false false 5398000000 5398.0 false false false xbrli:monetaryItemType monetary Period end amount of total net PPE No authoritative reference available. true 94 2 us-gaap_PropertyPlantAndEquipmentOther us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 4700000 4.7 false false false 2 false true false false 4400000 4.4 false false false xbrli:monetaryItemType monetary This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 97 2 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 5472400000 5472.4 false false false 2 false true false false 5402400000 5402.4 false false false xbrli:monetaryItemType monetary Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 true 98 2 us-gaap_OtherAssetsNoncurrentAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 100 2 us-gaap_UnamortizedDebtIssuanceExpense us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 17800000 17.8 false false false 2 false true false false 20100000 20.1 false false false xbrli:monetaryItemType monetary The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. No authoritative reference available. false 101 2 us-gaap_RegulatoryAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 327400000 327.4 false false false 2 false true false false 335600000 335.6 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 false 107 2 te_TotalOtherAssets te false debit instant Total Other Assets false false false false false false false false false false false totallabel false 1 false true false false 369200000 369.2 false false false 2 false true false false 356900000 356.9 false false false xbrli:monetaryItemType monetary Total Other Assets No authoritative reference available. true 108 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 6411800000 6411.8 false false false 2 false true false false 6273800000 6273.8 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 109 2 us-gaap_LongTermDebtCurrentAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 112 2 us-gaap_NotesPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 27000000 27.0 false false false 2 false true false false 55000000 55.0 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 false 113 2 us-gaap_LongTermDebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3400000 3.4 false false false 2 false true false false 3700000 3.7 false false false xbrli:monetaryItemType monetary Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 114 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 188500000 188.5 false false false 2 false true false false 206100000 206.1 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 115 2 us-gaap_CustomerDepositsCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 154900000 154.9 false false false 2 false true false false 151200000 151.2 false false false xbrli:monetaryItemType monetary The current portion, due within one year or the normal operating cycle, if longer, of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. No authoritative reference available. false 116 2 us-gaap_RegulatoryLiabilityCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 108700000 108.7 false false false 2 false true false false 85400000 85.4 false false false xbrli:monetaryItemType monetary The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 false 117 2 us-gaap_DerivativeLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 45500000 45.5 false false false 2 false true false false 33100000 33.1 false false false xbrli:monetaryItemType monetary Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 false 118 2 us-gaap_DeferredTaxLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 200000 0.2 false false false 2 false true false false 15900000 15.9 false false false xbrli:monetaryItemType monetary Represents the current portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A current taxable temporary difference is a difference between the tax basis and the carrying amount of a current asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 false 119 2 us-gaap_InterestPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 44500000 44.5 false false false 2 false true false false 27700000 27.7 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 false 120 2 us-gaap_AccruedIncomeTaxesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 61200000 61.2 false false false 2 false true false false 12100000 12.1 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. 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Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 true 123 2 us-gaap_OtherLiabilitiesNoncurrentAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 124 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 589500000 589.5 false false false 2 false true false false 543800000 543.8 false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 false 125 2 us-gaap_AccumulatedDeferredInvestmentTaxCredit us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 10500000 10.5 false false false 2 false true false false 10800000 10.8 false false false xbrli:monetaryItemType monetary The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A false 130 2 us-gaap_LongTermDebtNoncurrentAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 133 2 te_TotalOtherLongTermLiabilities te false credit instant Total Other Long-term Liabilities false false false false false false false false false false false totallabel false 1 false true false false 1602000000 1602.0 false false false 2 false true false false 1568900000 1568.9 false false false xbrli:monetaryItemType monetary Total Other Long-term Liabilities No authoritative reference available. true 135 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 136 2 us-gaap_CommonStockValue us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1852400000 1852.4 false false false 2 false true false false 1802400000 1802.4 false false false xbrli:monetaryItemType monetary Dollar value of issued common stock whether issued at par value, no par or stated value. 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