Name:	tcp_RelatedPartyCostsChargedAndAmountsPayableAbstract
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Impact on the entity's proportionate share for the period of the net income (loss) of its equity method investee of transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

No definition available.

Name:	tcp_RelatedPartyIncomeLossFromEquityMethodInvestmentsImpactDueToCostsChargedWithRelatedParty
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Impact on partnership net income during the period of transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

No definition available.

Name:	tcp_RelatedPartyNetIncomeImpactDueToCostsChargedWithRelatedParty
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The proportionate share of related party revenues earned by an equity method investee included in equity in earnings from unconsolidated affiliates.

No definition available.

Name:	tcp_RelatedPartyRevenuesIncludedInPartnershipIncomeAsEquityMethodInvestmentIncome
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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
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-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of cash inflow from the sale of other assets as part of operating activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

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-Name Accounting Standards Codification
-Topic 946
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Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_GreatLakesGasTransmissionLimitedPartnershipMember
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Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_NorthernBorderPipelineCompanyMember
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Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_PortlandNaturalGasTransmissionSystemMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_GeneralPartnerMember
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Name:	us-gaap_RelatedPartyTransactionAxis=tcp_ReimbursementOfCostsOfServicesProvidedMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tcp_TransCanadaCorporationSubsidiariesMember
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Name:	dei_LegalEntityAxis=tcp_GreatLakesGasTransmissionLimitedPartnershipMember
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Name:	us-gaap_RelatedPartyTransactionAxis=tcp_CapitalAndOperatingCostsMember
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Name:	us-gaap_RelatedPartyTransactionAxis=tcp_TransportationContractsRelatedPartyMember
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Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
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Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
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Name:	us-gaap_RelatedPartyTransactionAxis=tcp_AffiliatedRentalRevenueMember
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Name:	dei_LegalEntityAxis=tcp_NorthernBorderPipelineCompanyMember
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Name:	dei_LegalEntityAxis=tcp_PortlandNaturalGasTransmissionSystemMember
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Name:	dei_LegalEntityAxis=tcp_GasTransmissionNorthwestLLCMember
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Name:	dei_LegalEntityAxis=tcp_BisonPipelineLLCMember
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Name:	dei_LegalEntityAxis=tcp_NorthBajaPipelineLLCMember
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Name:	dei_LegalEntityAxis=tcp_TuscaroraGasTransmissionCompanyMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_SubsidiaryOfCommonParentMember
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Name:	us-gaap_RelatedPartyTransactionAxis=tcp_TransactionBetweenEntitiesUnderCommonControlMember
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Name:	us-gaap_BusinessAcquisitionAxis=tcp_GasTransmissionNorthwestLLCMember
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