PARTNERS' EQUITY - Issuance of Class B Units (Details 3)	Apr. 01, 2015
GTN \| TransCanada \| Distributions \| Class B units
Partners' Equity
Portion of GTN's annual distributions to which the Class B units are entitled to receive a percentage share of the distributions above threshold (as a percent)	30.00%

Represents the percentage portion of subsidiary distributions to which the holder of capital units is entitled to receive partners capital account distributions at a specified percentage in excess of a specified amount, as defined.

No definition available.

Name:	tcp_CapitalUnitsPercentageOfSubsidiaryDistributionsSubjectToRightsOfHolderToReceivePartnersCapitalAccountDistributionsAtSpecifiedPercentageInExcessOfSpecifiedAmount
Namespace Prefix:	tcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration