SIGNIFICANT ACCOUNTING POLICIES (Details) (Former parent, TransCanada subsidiaries, Transaction between entities under common control)	0 Months Ended
Jul. 02, 2013
GTN
Summary of Significant Accounting Policies
Interest acquired by the Partnership (as a percent)	45.00%
Ownership interest (as a percent)	70.00%
Bison
Summary of Significant Accounting Policies
Interest acquired by the Partnership (as a percent)	45.00%
Ownership interest (as a percent)	70.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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