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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Generated From Operations    
Net income $ 64us-gaap_ProfitLoss $ 67us-gaap_ProfitLoss
Depreciation 21us-gaap_Depreciation 21us-gaap_Depreciation
Amortization of debt issue costs 1us-gaap_AmortizationOfFinancingCosts  
Accruals for costs related to the 2015 Acquisition (Note 13) 2us-gaap_NoncashMergerRelatedCosts  
Change in operating working capital (Note 9) 3us-gaap_IncreaseDecreaseInOperatingCapital 16us-gaap_IncreaseDecreaseInOperatingCapital
Total cash generated from operations 87us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 97us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities    
Capital expenditures (3)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total investing activities (5)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (6)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities    
Distributions paid (Note 8) (55)tclp_DistributionsMadeToGeneralPartnerInterestAndLimitedPartnerCashDistributionsPaid (52)tclp_DistributionsMadeToGeneralPartnerInterestAndLimitedPartnerCashDistributionsPaid
Distributions paid to non-controlling interests (9)us-gaap_PaymentsOfDividendsMinorityInterest (13)us-gaap_PaymentsOfDividendsMinorityInterest
Long-term debt issued, net of discount 349us-gaap_ProceedsFromDebtNetOfIssuanceCosts  
Long-term debt repaid (10)us-gaap_RepaymentsOfLongTermDebt (10)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs (2)us-gaap_PaymentsOfDebtIssuanceCosts  
Total financing activities 276us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (75)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase/(decrease) in cash and cash equivalents 358us-gaap_NetCashProvidedByUsedInContinuingOperations 16us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, beginning of period 26us-gaap_CashAndCashEquivalentsAtCarryingValue 25us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 384us-gaap_CashAndCashEquivalentsAtCarryingValue 41us-gaap_CashAndCashEquivalentsAtCarryingValue
ATM Equity Issuance Program    
Financing Activities    
Equity issuance, net (Note 6) 3us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ tclp_SaleOfLimitedPartnershipUnitsAxis
= tclp_AtMarketEquityIssuanceProgramMember
 
Northern Border    
Cash Generated From Operations    
Equity earnings in excess of cumulative distributions   (2)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_NorthernBorderPipelineCompanyMember
Investing Activities    
Cumulative distributions in excess of equity earnings 2us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_NorthernBorderPipelineCompanyMember
 
Great Lakes    
Cash Generated From Operations    
Equity earnings in excess of cumulative distributions (4)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
(5)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
Investing Activities    
Investment $ (4)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember
$ (4)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tclp_GreatLakesGasTransmissionLimitedPartnershipMember