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BENEFITS Benefits - Weighted-average Assumptions (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 25, 2012
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Postemployment Benefits [Abstract]        
Discount rate 4.24%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.02%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.29%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 3.66%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Tax exempt accounts 7.00%ete_ExpectedLongTermReturnOnAssetsTaxExemptAccounts 7.00%ete_ExpectedLongTermReturnOnAssetsTaxExemptAccounts 7.00%ete_ExpectedLongTermReturnOnAssetsTaxExemptAccounts 7.00%ete_ExpectedLongTermReturnOnAssetsTaxExemptAccounts
Expected long term reurn on assets, taxable accounts 4.50%ete_ExpectedLongTermReurnOnAssetsTaxableAccounts 4.50%ete_ExpectedLongTermReurnOnAssetsTaxableAccounts 4.50%ete_ExpectedLongTermReurnOnAssetsTaxableAccounts 4.50%ete_ExpectedLongTermReurnOnAssetsTaxableAccounts