Represents the number of intermediate limited partnerships through which the entity owns its pipeline assets.

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_NorthernBorderPipelineCompanyMember
Namespace Prefix:
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- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_GreatLakesGasTransmissionLimitedPartnershipMember
Namespace Prefix:
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- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tcp_IroquoisGasTransmissionLimitedPartnershipMember
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- Details

Name:	srt_OwnershipAxis=tcp_GasTransmissionNorthwestLLCMember
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Data Type:	na
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ORGANIZATION - Ownership Interests in Natural Gas Pipeline Systems (Details) - LimitedPartnership		9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Dec. 30, 2019	Nov. 01, 2019	Aug. 31, 2019
Organization
Number of intermediate limited partnerships through which pipeline assets are owned		3
Northern Border
Organization
Ownership interest (as a percent)		50.00%
Great Lakes
Organization
Ownership interest (as a percent)		46.45%
Iroquois
Organization
Ownership interest (as a percent)		49.34%	49.34%	49.34%	49.34%
GTN
Organization
Ownership interest (as a percent)	100.00%