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ACQUISITIONS (Details Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended
May 22, 2013
Jul. 02, 2013
May 22, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 01, 2013
Apr. 11, 2013
Oct. 01, 2014
Jun. 30, 2013
Equity Issuance, May 2013 | Common Units (Limited Partners)                    
Acquisition                    
Units sold in public offering 8,855,000us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
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Price per common unit in public offering $ 43.85us-gaap_SharesIssuedPricePerShare
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= us-gaap_LimitedPartnerMember
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  43.85us-gaap_SharesIssuedPricePerShare
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/ tclp_SaleOfLimitedPartnershipUnitsAxis
= tclp_SaleOfLimitedPartnershipUnitsPublicOfferingMay2013Member
             
Net proceeds from issuance of common units $ 373us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
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= us-gaap_LimitedPartnerMember
/ tclp_SaleOfLimitedPartnershipUnitsAxis
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Term Loan Facility due 2018                    
Acquisition                    
Borrowings under the facility   500us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= tclp_TermLoanDue2018Member
               
Maximum borrowing capacity             500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= tclp_TermLoanDue2018Member
     
Senior Credit Facility due 2017 | Senior revolving credit facility                    
Acquisition                    
Maximum borrowing capacity             500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= tclp_SeniorCreditFacilityDue20November2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
TC PipeLines GP, Inc. | Equity Issuance, May 2013 | General Partner                    
Acquisition                    
Capital contribution 8us-gaap_PartnersCapitalAccountContributions
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= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
/ tclp_SaleOfLimitedPartnershipUnitsAxis
= tclp_SaleOfLimitedPartnershipUnitsPublicOfferingMay2013Member
                 
TC PipeLines GP, Inc. | General Partner                    
Acquisition                    
Ownership interest in the Partnership (as a percent) 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
  2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= tclp_TCPipeLinesGeneralPartnershipIncorporatedMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
       
GTN and Bison                    
Acquisition                    
Cash paid         921us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
[1]          
GTN and Bison | Former parent, TransCanada subsidiaries | Transaction between entities under common control                    
Acquisition                    
Purchase price             1,050us-gaap_BusinessCombinationConsiderationTransferred1
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= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Working capital adjustments             17us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Cash paid             921us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Recorded purchase price                    
Current assets             67us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
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= us-gaap_SubsidiaryOfCommonParentMember
     
Property, plant and equipment, net             1,792us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
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= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Other assets             1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Current liabilities             (20)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Other liabilities             (21)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Long-term debt             (325)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Net assets acquired             1,494us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
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= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Carrying value of acquired 45% interest in each of GTN and Bison             672tclp_BusinessCombinationStepAcquisitionEquityInterestInAcquireeSubsequentAcquisitionCarryingValue
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Excess purchase price over net assets acquired (includes Carty Lateral consideration)             274tclp_BusinessCombinationStepAcquisitionExcessOfCostOfAdditionalEquityAcquiredOverCarryingValueOfNetAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Total cash consideration including $25 million Carty Lateral consideration             946tclp_PaymentsToAcquireBusinessesNetOfCashAcquiredIncludingBusinessCombinationContingentConsiderationLiabilityRecognized
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Increase in the net income attributable to common units resulting from retrospective consolidation         26tclp_IncreaseInNetIncomeAttributableToLimitedPartnersResultingFromRetrospectiveConsolidationOfAcquiree
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
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55tclp_IncreaseInNetIncomeAttributableToLimitedPartnersResultingFromRetrospectiveConsolidationOfAcquiree
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
       
GTN and Bison | Former parent, TransCanada subsidiaries | Transaction between entities under common control | Carrying value                    
Recorded purchase price                    
Non-controlling interest             (448)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCAndBisonPipelineLLCMember
/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
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= us-gaap_SubsidiaryOfCommonParentMember
     
Carrying value of pre-existing 25% interest in each of GTN and Bison             (374)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
/ us-gaap_BusinessAcquisitionAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
GTN                    
Acquisition                    
Payment with respect to the Carty Lateral consideration       25us-gaap_PaymentsForPreviousAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
           
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
     
Purchase price             750us-gaap_BusinessCombinationConsiderationTransferred1
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/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Acquired debt             146us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
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/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Contingent additional payment, maximum             25us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Payment with respect to the Carty Lateral consideration               25us-gaap_PaymentsForPreviousAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
   
Recorded purchase price                    
Excess purchase price over net assets acquired (includes Carty Lateral consideration)             262tclp_BusinessCombinationStepAcquisitionExcessOfCostOfAdditionalEquityAcquiredOverCarryingValueOfNetAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Pre-existing interest acquired by the partnership (as a percent)                   25.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control | Accounts payable to affiliates                    
Recorded purchase price                    
Contingent consideration         25us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BalanceSheetLocationAxis
= tclp_AccountsPayableRelatedPartiesMember
/ 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
     
Purchase price             300us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
  215us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
 
Working capital adjustments                 2us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
 
Recorded purchase price                    
Excess purchase price over net assets acquired (includes Carty Lateral consideration)             $ 12tclp_BusinessCombinationStepAcquisitionExcessOfCostOfAdditionalEquityAcquiredOverCarryingValueOfNetAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
     
Pre-existing interest acquired by the partnership (as a percent)                   25.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_BusinessAcquisitionAxis
= tclp_BisonPipelineLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
[1] Recast as discussed in Note 2 and Note 6.