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FAIR VALUE MEASUREMENTS 5 (Details) (USD $)
 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2014
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Fair value measurement percentage, of level two hierarchy, for Rockies Express 100.00%sre_FairValueMeasurementPercentageOfLevelTwoHierarchyForJointVenture 67.00%sre_FairValueMeasurementPercentageOfLevelTwoHierarchyForJointVenture    
Investment in Energia Sierra Juarez $ 26,000,000sre_InvestmentInJointVenture [1]      
Investment in Rockies Express     369,000,000us-gaap_EquityMethodInvestmentAggregateCost [2]  
Fair Value Measurement Percentage Of Level Three Hierarchy For Joint Ventures   33.00%sre_FairValueMeasurementPercentageOfLevelThreeHierarchyForJointVenture    
Equity Method Investments [Member] | Market Approach Valuation Technique [Member]        
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Investment in Energia Sierra Juarez       25,000,000sre_InvestmentInJointVenture
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Investment in Rockies Express       $ 340,000,000us-gaap_EquityMethodInvestmentAggregateCost
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Equity Method Investments [Member] | Market Approach Valuation Technique [Member] | Level 2 | Sixty Seven Percent [Member] | Stated [Member]        
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Fair value inputs, equity sale offer price   100.00%sre_FairValueInputsEquitySaleOfferPrice
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Equity Method Investments [Member] | Market Approach Valuation Technique [Member] | Level 2 | One Hundred Percent [Member]        
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Fair value inputs, equity sale offer price 100.00%sre_FairValueInputsEquitySaleOfferPrice
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Equity Method Investments [Member] | Probability Weighted Discounted Cash Flow Valuation Technique [Member] | Level 3 | Thirty Three Percent [Member] | Maximum [Member]        
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Fair value inputs, combined transportation rate assumption   78.00%sre_FairValueInputsCombinedTransportationRateAssumption
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Fair value inputs, operating and maintenance escalation rate   1.00%sre_FairValueInputsOperatingAndMaintenanceEscalationRate
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Fair value inputs, forecasted interest rate on debt to be refinanced   10.00%sre_FairValueInputsForecastedInterestRateOnDebtToBeRefinanced
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Fair value inputs, discount rate   10.00%us-gaap_FairValueInputsDiscountRate
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Equity Method Investments [Member] | Probability Weighted Discounted Cash Flow Valuation Technique [Member] | Level 3 | Thirty Three Percent [Member] | Minimum [Member]        
Fai rValue Inputs Assets Quantitative Information [Line Items]        
Fair value inputs, combined transportation rate assumption   6.00%sre_FairValueInputsCombinedTransportationRateAssumption
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Fair value inputs, operating and maintenance escalation rate   0.00%sre_FairValueInputsOperatingAndMaintenanceEscalationRate
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Fair value inputs, forecasted interest rate on debt to be refinanced   5.00%sre_FairValueInputsForecastedInterestRateOnDebtToBeRefinanced
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Fair value inputs, discount rate   8.00%us-gaap_FairValueInputsDiscountRate
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[1]
At measurement date of July 16, 2014. At December 31, 2014, our investment in Energía Sierra Juárez had a carrying value of $25 million, reflecting subsequent equity method activity to record distributions and earnings.
[2]
At measurement date of September 30, 2012. At December 31, 2014, our investment in Rockies Express had a carrying value of $340 million, reflecting subsequent equity method activity to record distributions and earnings.
[3]
Transportation rate beyond existing contract terms as a percentage of current mean REX rates.