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false 200000000 200000000 [3] true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 true true false false 35000000 35000000 [4] true false false 27 true true false false 25000000 25000000 [4] true false false 28 true true false false 10000000 10000000 [4] true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 true true false false 100000000 100000000 [5] true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 7 4 us-gaap_LineOfCreditFacilityAmountOutstanding 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 1775000000 1775000000 false false false 2 false false false false 0 0 false false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false true false false 0 0 true false false 27 false true false false 0 0 true false false 28 false true false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false true false false 14800000 14800000 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false true false false 27500000 27500000 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false true false false 41100000 41100000 true false false 42 false false false false 0 0 true false false 43 false true false false 56000000 56000000 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount borrowed under the credit facility as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 8 4 etr_LettersOfCredit etr false credit instant Letters Of Credit false false false false false false false false false false false verboselabel false 1 false true false false 25000000 25000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Letters Of Credit No authoritative reference available. false 9 4 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity 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 1672000000 1672000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 10 3 etr_CreditFacilitiesAbstract etr false na duration Credit facilities. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Credit facilities. false 11 4 us-gaap_LineOfCreditFacilityExpirationDate us-gaap true na duration No definition available. false false false false false false 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 3 false false false false 0 0 April 2011 April 2011 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 August 2012 August 2012 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 August 2012 August 2012 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 May 2011 May 2011 true false false 27 false false false false 0 0 May 2011 May 2011 true false false 28 false false false false 0 0 May 2011 May 2011 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 August 2012 August 2012 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:dateStringItemType normalizedstring Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 12 4 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity 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 3472000000 3472000000 false false false 2 false false false false 0 0 false false false 3 false true false false 75125000 75125000 [1] true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 100000000 100000000 [2] true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 200000000 200000000 [3] true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false true false false 35000000 35000000 [4] true false false 27 false true false false 25000000 25000000 [4] true false false 28 false true false false 10000000 10000000 [4] true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 100000000 100000000 [5] true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 13 4 us-gaap_LineOfCreditFacilityInterestRateDuringPeriod us-gaap true na duration No definition available. false false false false false false 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 3 false true false false 0.0275 0.0275 [6] true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0.0067 0.0067 [6] true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0.0067 0.0067 [6] true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false true false false 0.0201 0.0201 [6] true false false 27 false true false false 0.0201 0.0201 [6] true false false 28 false true false false 0.0201 0.0201 [6] true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0.0073 0.0073 [6] true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure The effective interest during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 14 4 us-gaap_LineOfCreditFacilityAmountOutstanding 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 1775000000 1775000000 false false false 2 false false false false 0 0 false false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false true false false 0 0 true false false 27 false true false false 0 0 true false false 28 false true false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false true false false 14800000 14800000 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false true false false 27500000 27500000 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false true false false 41100000 41100000 true false false 42 false false false false 0 0 true false false 43 false true false false 56000000 56000000 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount borrowed under the credit facility as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 15 3 etr_IssuanceOfCommercialPaperToFinanceAcquisitionAndOwnershipOfNuclearFuelAbstract etr false na duration Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel. false 16 4 etr_ExpirationDate etr false na instant Expiration Date. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 41456 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 41456 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 41456 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 41456 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Expiration Date. No authoritative reference available. false 17 4 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false true false false 85000000 85000000 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false true false false 85000000 85000000 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false true false false 90000000 90000000 true false false 42 false false false false 0 0 true false false 43 false true false false 100000000 100000000 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 18 4 etr_WeightedAverageInterestRateOnBorrowings etr false na instant Weighted Average Interest Rate on Borrowings. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false true false false 0.0236 0.0236 [7] true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false true false false 0.025 0.025 [7] true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false true false false 0.0237 0.0237 [7] true false false 42 false false false false 0 0 true false false 43 false true false false 0.0245 0.0245 [7] true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Weighted Average Interest Rate on Borrowings. No authoritative reference available. false 19 4 us-gaap_LineOfCreditFacilityAmountOutstanding us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1775000000 1775000000 false false false 2 false false false false 0 0 false false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false true false false 0 0 true false false 27 false true false false 0 0 true false false 28 false true false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false true false false 14800000 14800000 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false true false false 27500000 27500000 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false true false false 41100000 41100000 true false false 42 false false false false 0 0 true false false 43 false true false false 56000000 56000000 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount borrowed under the credit facility as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 true 20 3 etr_RevolvingCreditFacilitiesLinesOfCreditShortTermBorrowingsAndLongTermDebtTextualsAbstract etr false na duration Revolving Credit Facilities Lines Of Credit Short Term Borrowings And Long Term Debt Textuals Abstract. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Revolving Credit Facilities Lines Of Credit Short Term Borrowings And Long Term Debt Textuals Abstract. false 21 4 etr_CreditFacilityExpirationDate etr false na duration Credit Facility Expiration Date. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 August 2012 August 2012 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Credit Facility Expiration Date. No authoritative reference available. false 22 4 etr_CreditFacilityMaximumBorrowingCapacity etr false credit instant CreditFacilityMaximumBorrowingCapacity false false false false false false false false false false false verboselabel false 1 false true false false 3500000000 3500000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary CreditFacilityMaximumBorrowingCapacity No authoritative reference available. false 23 4 etr_CommitmentAmountPercentageOfFacilityFeeMinimum etr false na duration Commitment amount percentage of facility fee minimum. false false false false false false false false false false false verboselabel false 1 false true false false 0.0009 0.0009 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:pureItemType pure Commitment amount percentage of facility fee minimum. No authoritative reference available. false 24 4 etr_CommitmentAmountPercentageOfFacilityFeeMaximum etr false na duration CommitmentAmountPercentageOfFacilityFeeMinimum false false false false false false false false false false false verboselabel false 1 false true false false 0.0015 0.0015 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:pureItemType pure CommitmentAmountPercentageOfFacilityFeeMinimum No authoritative reference available. false 25 4 etr_CommitmentAmountPercentageOfFacilityFee etr false na duration Commitment amount percentage of facility fee. false false false false false false false false false false false verboselabel false 1 false true false false 0.00125 0.00125 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Commitment amount percentage of facility fee. No authoritative reference available. false 26 4 etr_CommitmentFeeOnCreditFacilitiesAsPercentageOfCommitmentAmount etr false na duration Commitment fee on credit facilities as a percentage of commitment amount. false false false false false false false false false false false verboselabel false 1 false true false false 0.002 0.002 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Commitment fee on credit facilities as a percentage of commitment amount. No authoritative reference available. false 27 4 etr_WeightedAverageInterestRate etr false na duration Weighted average interest rate. false false false false false false false false false false false verboselabel false 1 false true false false 0.00771 0.00771 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Weighted average interest rate. No authoritative reference available. false 28 4 etr_ConsolidatedDebtRatio etr false na duration Consolidated debt ratio. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 65% or less 65% or less false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 65% or less 65% or less [8] true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 65% or less 65% or less true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 65% or less 65% or less true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 65% or less 65% or less true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 65% or less 65% or less true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 70% or less 70% or less true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 70% or less 70% or less true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 70% or less 70% or less true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 70% or less 70% or less true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Consolidated debt ratio. No authoritative reference available. false 31 3 etr_ShortTermBorrowingsAndOutstandingShortTermBorrowingsAbstract etr false na duration Short-term borrowings and the outstanding short-term borrowings . 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Short-term borrowings and the outstanding short-term borrowings . false 32 4 etr_AuthorizedShortTermBorrowings etr false debit instant Authorized Short term borrowings. false false false false false false 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 3 false true false false 250000000 250000000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 200000000 200000000 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 250000000 250000000 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 175000000 175000000 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 100000000 100000000 true false false 30 false false false false 0 0 true false false 31 false true false false 200000000 200000000 true false false 32 false false false false 0 0 true false false 33 false true false false 200000000 200000000 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Authorized Short term borrowings. No authoritative reference available. false 33 4 us-gaap_ShortTermBorrowings us-gaap true credit instant No definition available. false false false false false false 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 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 22000000 22000000 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0 0 true false false 32 false false false false 0 0 true false false 33 false true false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 false 36 3 us-gaap_LongTermNotesPayableAbstract 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 37 4 us-gaap_LongTermNotesPayable us-gaap true credit instant No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false true false false 35000000 35000000 true false false 36 false true false false 30000000 30000000 true false false 37 false true false false 70000000 70000000 true false false 38 false false false false 0 0 true false false 39 false true false false 75000000 75000000 true false false 40 false true false false 60000000 60000000 true false false 41 false false false false 0 0 true false false 42 false true false false 50000000 50000000 true false false 43 false false false false 0 0 true false false 44 false true false false 70000000 70000000 true false false 45 false true false false 60000000 60000000 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 38 3 etr_BookValueAndFairValueOfLongTermDebtAbstract etr false na duration Book value and the fair value of long-term debt. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Book value and the fair value of long-term debt. false 39 4 us-gaap_DebtInstrumentCarryingAmount 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 11236169000 11236169000 [9] false false false 2 false false false false 0 0 false false false 3 false true false false 1597057000 1597057000 [9] true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 1580391000 1580391000 [9] true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 1783260000 1783260000 [9] true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 825359000 825359000 [9] true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 167266000 167266000 [9] true false false 30 false false false false 0 0 true false false 31 false true false false 1668151000 1668151000 [9] true false false 32 false false false false 0 0 true false false 33 false true false false 608169000 608169000 [9] true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 false 40 4 us-gaap_LongTermDebt 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 11822959000 11822959000 [10],[9] false false false 2 false false false false 0 0 false false false 3 false true false false 1673620000 1673620000 [10],[9] true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 1690930000 1690930000 [10],[9] true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 1921679000 1921679000 [10],[9] true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 827302000 827302000 [10],[9] true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 172551000 172551000 [10],[9] true false false 30 false false false false 0 0 true false false 31 false true false false 1907305000 1907305000 [10],[9] true false false 32 false false false false 0 0 true false false 33 false true false false 621266000 621266000 [10],[9] true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond 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 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 false 41 3 us-gaap_DebtInstrumentsAbstract 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 42 4 us-gaap_ProceedsFromIssuanceOfFirstMortgageBond us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 225000000 225000000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 150000000 150000000 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false true false false 100000000 100000000 true false false 21 false true false false 115000000 115000000 true false false 22 false true false false 100000000 100000000 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 80000000 80000000 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash inflow from amounts received from debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 43 4 us-gaap_DebtInstrumentPrincipalOutstanding us-gaap true credit instant No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false true false false 40000000 40000000 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 92120000 92120000 true false false 12 false true false false 200000000 200000000 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of outstanding principal due under the debt instrument at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b false 44 4 etr_DebtAssumed etr false credit instant DebtAssumed. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0 0 true false false 32 false true false false 168000000 168000000 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary DebtAssumed. No authoritative reference available. false 45 4 etr_PaymentOfFirstMortgageBond etr false credit instant Payment of first mortgage bond. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 150000000 150000000 false false false 3 false false false false 0 0 true false false 4 false true false false 100000000 100000000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false true false false 55000000 55000000 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false true false false 30000000 30000000 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Payment of first mortgage bond. No authoritative reference available. false 46 4 etr_PaymentOfFirstMortgageBondPercentage etr false na instant Payment of first mortgage bond percentage. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 0.0583 0.0583 false false false 3 false false false false 0 0 true false false 4 false true false false 0.045 0.045 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Payment of first mortgage bond percentage. No authoritative reference available. false 47 4 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2113927000 2113927000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 48 4 etr_IssuancesOfFirstMortgageBondPercentage etr false na duration Issuances of first mortgage bond percentage. false false false false false false 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 3 false true false false 0.0575 0.0575 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0.06 0.06 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false true false false 0.062 0.062 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Issuances of first mortgage bond percentage. No authoritative reference available. false 49 4 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false 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 3 false true false false 124100000 124100000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 250000000 250000000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false true false false 83680000 83680000 true false false 14 false true false false 31955000 31955000 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false true false false 250000000 250000000 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false true false false 115000000 115000000 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false true false false 450000000 450000000 true false false 47 false false false false 0 0 true false false 48 false true false false 550000000 550000000 true false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 50 4 etr_PortionOfProceedsToRepayOutstandingDebt etr false credit duration Portion of the proceeds to repay outstanding debt. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 100000000 100000000 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 150000000 150000000 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false true false false 100000000 100000000 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Portion of the proceeds to repay outstanding debt. No authoritative reference available. false 51 4 us-gaap_DebtInstrumentInterestRateDuringPeriod us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0.0658 0.0658 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 0.0498 0.0498 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure The average effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 52 4 etr_RedemptionOfFirstMortgageBondPercentage etr false na duration Redemption Of First Mortgage Bond Percentage. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 0.067 0.067 true false false 6 false true false false 100000000 100000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 0.076 0.076 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false true false false 0.0725 0.0725 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Redemption Of First Mortgage Bond Percentage. No authoritative reference available. false 53 4 us-gaap_RepaymentsOfFirstMortgageBond us-gaap true credit duration No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 160000000 160000000 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow from the repayment of debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 54 4 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false true false false 0.057 0.057 true false false 9 false true false false 0.0545 0.0545 true false false 10 false true false false 0.0395 0.0395 true false false 11 false true false false 0.0525 0.0525 true false false 12 false true false false 0.0485 0.0485 true false false 13 false true false false 0.05 0.05 true false false 14 false true false false 0.02875 0.02875 true false false 15 false false false false 0 0 true false false 16 false true false false 0.0467 0.0467 true false false 17 false true false false 0.057 0.057 true false false 18 false false false false 0 0 true false false 19 false true false false 0.0444 0.0444 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false true false false 0.05 0.05 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false true false false 0.05125 0.05125 true false false 48 false true false false 0.03625 0.03625 true false false us-types:percentItemType pure Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 55 4 us-gaap_CapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 224000000 224000000 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false true false false 222000000 222000000 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 false 56 4 etr_LongTermDoeObligations etr false credit instant Long-term DOE obligations. false false false false false false 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 3 false true false false 181000000 181000000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Long-term DOE obligations. No authoritative reference available. false 57 4 etr_NotesPayableToNypa etr false credit instant Notes payable to NYPA. false false false false false false false false false false false verboselabel false 1 false true false false 170000000 170000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Notes payable to NYPA. No authoritative reference available. false 58 4 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2272224000 2272224000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false true false false 74000000 74000000 true false false 30 false false false false 0 0 true false false 31 false true false false 200000000 200000000 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 59 4 us-gaap_RepaymentsOfNotesPayable us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 75000000 75000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow for a borrowing supported by a written promise to pay an obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 60 4 etr_IssuanceOfSeriesMortgageBondsPercentage etr false na duration Issuance of Series Mortgage Bonds Percentage. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0.036 0.036 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Issuance of Series Mortgage Bonds Percentage. No authoritative reference available. false 61 4 us-gaap_DebtInstrumentMaturityDate us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 2040-11-01 2040-11-01 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 2021-08-01 2021-08-01 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 2015-06-01 2015-06-01 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:dateItemType date Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 false 62 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths 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 10300000 10300000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b false 63 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo 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 12200000 12200000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b false 64 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree 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 12600000 12600000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b false 65 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour 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 12800000 12800000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b false 66 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive 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 13200000 13200000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b false 67 4 us-gaap_DebtInstrumentMaturityDateRangeStart us-gaap true na duration No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 November 1, 2011 November 1, 2011 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:dateStringItemType normalizedstring When presenting a range of maturity dates, the earliest date when the outstanding debt instruments are required to be repaid. May be presented in a variety of ways (for example: year only, month and year, day, month and year, and number of years). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 false 68 4 us-gaap_DebtInstrumentMaturityDateRangeEnd us-gaap true na duration No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 March 1, 2035 March 1, 2035 [8] true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:dateStringItemType normalizedstring When presenting a range of maturity dates, the latest date when the outstanding debt instruments are required to be repaid. May be presented in a variety of ways (for example: year only, month and year, day, month and year, and number of years). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 false 69 4 us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum us-gaap true na duration No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0.04875 0.04875 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:pureItemType pure When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 70 4 us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum us-gaap true na duration No definition available. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false true false false 0.0618 0.0618 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:pureItemType pure When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 71 4 us-gaap_RepaymentsOfBankDebt us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 60000000 60000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash outflow to settle a bank borrowing during the year. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 72 4 etr_CarryingCostsOnIssuanceOfBondsToRecoverStormDamageRestorationCosts etr false debit duration Carrying costs on issuance of bonds to recover storm damage, restoration costs. false false false false false false 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 3 false true false false 11500000 11500000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Carrying costs on issuance of bonds to recover storm damage, restoration costs. No authoritative reference available. false 73 4 etr_UpFrontFinancingCostsOnIssuanceOfBondsToRecoverStormDamageRestorationCosts etr false debit duration Up-front financing costs on issuance of bonds to recover storm damage, restoration costs. false false false false false false 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 3 true true false false 4600000 4600000 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:monetaryItemType monetary Up-front financing costs on issuance of bonds to recover storm damage, restoration costs. No authoritative reference available. false 74 4 etr_CouponRateOfStormCostRecoveryBonds etr false na duration Coupon rate of Storm cost recovery bonds. false false false false false false 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 3 false true false false 0.023 0.023 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false us-types:percentItemType pure Coupon rate of Storm cost recovery bonds. No authoritative reference available. false 75 4 etr_PossibilityOfIncreaseInInterestRate etr false na duration Possibility of increase in interest rate. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 upto 2 % upto 2 % false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false 21 false false false false 0 0 true false false 22 false false false false 0 0 true false false 23 false false false false 0 0 true false false 24 false false false false 0 0 true false false 25 false false false false 0 0 true false false 26 false false false false 0 0 true false false 27 false false false false 0 0 true false false 28 false false false false 0 0 true false false 29 false false false false 0 0 true false false 30 false false false false 0 0 true false false 31 false false false false 0 0 true false false 32 false false false false 0 0 true false false 33 false false false false 0 0 true false false 34 false false false false 0 0 true false false 35 false false false false 0 0 true false false 36 false false false false 0 0 true false false 37 false false false false 0 0 true false false 38 false false false false 0 0 true false false 39 false false false false 0 0 true false false 40 false false false false 0 0 true false false 41 false false false false 0 0 true false false 42 false false false false 0 0 true false false 43 false false false false 0 0 true false false 44 false false false false 0 0 true false false 45 false false false false 0 0 true false false 46 false false false false 0 0 true false false 47 false false false false 0 0 true false false 48 false false false false 0 0 true false false xbrli:stringItemType string Possibility of increase in interest rate. No authoritative reference available. false 1 The credit facility requires Entergy Arkansas to maintain a debt ratio of 65% or less of its total capitalization. Borrowings under the Entergy Arkansas credit facility may be secured by a security interest in its accounts receivable. 2 The credit facility allows Entergy Gulf States Louisiana to issue letters of credit against the borrowing capacity of the facility. As of September 30, 2010, no letters of credit were outstanding. The credit facility requires Entergy Gulf States Louisiana to maintain a consolidated debt ratio of 65% or less of its total capitalization. Pursuant to the terms of the credit agreement, the amount of debt assumed by Entergy Texas ($0 as of September 30, 2010 and $168 million as of December 31, 2009) is excluded from debt and capitalization in calculating the debt ratio. 3 The credit facility allows Entergy Louisiana to issue letters of credit against the borrowing capacity of the facility. As of September 30, 2010, no letters of credit were outstanding. The credit facility requires Entergy Louisiana to maintain a consolidated debt ratio of 65% or less of its total capitalization. 4 Borrowings under the Entergy Mississippi credit facilities may be secured by a security interest in its accounts receivable. Entergy Mississippi is required to maintain a consolidated debt ratio of 65% or less of its total capitalization 5 The credit facility allows Entergy Texas to issue letters of credit against the borrowing capacity of the facility. As of September 30, 2010, no letters of credit were outstanding. The credit facility requires Entergy Texas to maintain a consolidated debt ratio of 65% or less of its total capitalization. Pursuant to the terms of the credit agreement securitization bonds are excluded from debt and capitalization in calculating the debt ratio. 6 The interest rate is the rate as of September 30, 2010 that would be applied to outstanding borrowings under the facility. 7 Includes letter of credit fees and bank fronting fees on commercial paper issuances by the VIEs for Entergy Arkansas, Entergy Louisiana, and System Energy. The VIE for Entergy Gulf States Louisiana does not issue commercial paper, but borrows directly on its bank credit facility. 8 Net of tax expense (benefit) of $2,236, ($255), respectively 9 The values exclude lease obligations of $224 million at Entergy Louisiana and $222 million at System Energy, long-term DOE obligations of $181 million at Entergy Arkansas, and the note payable to NYPA of $170 million at Entergy, and include debt due within one year. 10 The fair value is determined by nationally recognized investment banking firms. 48 67 false NoRounding UnKnown UnKnown false true