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SUBSEQUENT EVENTS (Details) (Subsequent event, GTN, Former parent, TransCanada subsidiaries, Transaction between entities under common control, USD $)
0 Months Ended
Apr. 01, 2015
Apr. 01, 2015
Acquisition    
Interest acquired (as a percent) 30.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired 30.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Purchase price $ 446,000,000us-gaap_BusinessCombinationConsiderationTransferred1  
Purchase price adjustments 10,000,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred  
Total cash consideration 263,000,000us-gaap_PaymentsToAcquireBusinessesGross  
Assumption of proportional debt 98,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred  
Partnership interest | Class B units
   
Acquisition    
Equity issuance 95,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Distributions    
Portion of GTN's annual distributions to which the Class B units are entitled to receive a percentage share of the distributions above $20 million (as a percent) 30.00%tclp_CapitalUnitsPercentageOfSubsidiaryDistributionsSubjectToRightsOfHolderToReceivePartnersCapitalAccountDistributionsAtSpecifiedPercentageInExcessOfSpecifiedAmount
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_RelatedPartyTransactionAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Period for payment of 30 percent of GTN's distributions above $20 million at 100 percent 5 years  
Percentage applied to 30 percent of GTN's distributions above $20 million for the first five years 100.00%tclp_CapitalUnitsRightsOfHolderToReceivePartnersCapitalAccountDistributionsInitialPercentageDuringSpecifiedPeriodAppliedToSubsidiaryDistributionsInExcessOfSpecifiedAmount
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Threshold of 30 percent of GTN's annual distributions for payment to Class B units at specified percentage $ 20,000,000tclp_CapitalUnitsRightsOfHolderToReceivePartnersCapitalAccountDistributionsThresholdOfSubsidiaryDistributionsForPayment
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
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/ us-gaap_RelatedPartyTransactionAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Percentage applied to 30 percent of GTN's distributions above $20 million after the first five years 25.00%tclp_CapitalUnitsRightsOfHolderToReceivePartnersCapitalAccountDistributionsPercentageAfterSpecifiedPeriodAppliedToSubsidiaryDistributionsInExcessOfSpecifiedAmount
/ us-gaap_BusinessAcquisitionAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_RelatedPartyTransactionAxis
= tclp_TransactionBetweenEntitiesUnderCommonControlMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember