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SUBSEQUENT EVENTS (Details 3) (Subsequent event, GTN, Expected)
 0 Months Ended
Apr. 23, 2015
Subsequent event | GTN | Expected
  
Subsequent events  
Mainline rate reduction on July 1, 2015 3.00%tclp_PipelineSystemRateSettlementFederalEnergyRegulatoryCommissionInitialApprovedRateIncreaseDecreasePercentage
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Additional rate decrease January 2016 through December 31, 2019 10.00%tclp_PipelineSystemRateSettlementFederalEnergyRegulatoryCommissionFirstAdditionalApprovedRateIncreaseDecreasePercentage
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= tclp_GasTransmissionNorthwestLLCMember
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Additional rate decrease January 1, 2020 through December 31, 2021 8.00%tclp_PipelineSystemRateSettlementFederalEnergyRegulatoryCommissionSecondAdditionalApprovedRateIncreaseDecreasePercentage
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= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_StatementScenarioAxis
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