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SIGNIFICANT ACCOUNTING POLICIES (Details)
Sep. 30, 2014
Jul. 01, 2013
Oct. 01, 2014
Bison | TransCanada      
Acquisition      
Remaining noncontrolling ownership interest (as a percent) 30.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= tclp_TransCanadaCorporationAndSubsidiariesExcludingGeneralPartnerSubsidiariesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_BisonPipelineLLCMember		    
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control      
Acquisition      
Interest acquired by Partnership (as a percent)   45.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		  
Ownership interest, including acquired interest (as a percent)   70.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		  
Bison | Former parent, TransCanada subsidiaries | Transaction between entities under common control      
Acquisition      
Interest acquired by Partnership (as a percent)   45.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		 30.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
Ownership interest, including acquired interest (as a percent)   70.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember