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SUBSEQUENT EVENTS (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended
Apr. 23, 2015
Apr. 21, 2015
Apr. 01, 2015
May 01, 2015
Mar. 31, 2015
Northern Border          
Distributions          
Ownership interest (as a percent)         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_NorthernBorderPipelineCompanyMember
Great Lakes          
Distributions          
Ownership interest (as a percent)         46.45%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
Subsequent event          
Distributions          
Cash distribution (in dollars per unit) $ 0.84us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent event | GTN          
Distributions          
Distribution declared   $ 37us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared
/ dei_LegalEntityAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Ownership interest (as a percent)     100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ dei_LegalEntityAxis
= tclp_GasTransmissionNorthwestLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent event | Distribution declared | Northern Border          
Distributions          
Partnership distribution   52us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember
/ dei_LegalEntityAxis
= tclp_NorthernBorderPipelineCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent event | Distribution declared | Great Lakes          
Distributions          
Partnership distribution   30us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember
/ dei_LegalEntityAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent event | Cash Distribution Paid | Northern Border          
Distributions          
Partnership's share of distributions       26us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_DividendsAxis
= us-gaap_DividendPaidMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_NorthernBorderPipelineCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent event | Cash Distribution Paid | Great Lakes          
Distributions          
Partnership's share of distributions       $ 14us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_DividendsAxis
= us-gaap_DividendPaidMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember