This element represents the total cash call issued by an equity method investee to fund a debt repayment.

No definition available.

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- Definition

Represents the percentage of capital and operating costs charged by TransCanada's subsidiaries.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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).

+ References

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-Publisher FASB

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- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

+ References

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

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.

+ References

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- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

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-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

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-Name Staff Accounting Bulletin (SAB)

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- Definition

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

+ References

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

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-Name Regulation S-X (SX)

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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.

+ References

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

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-Subparagraph (SX 210.5-03.1(e))

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

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-Name Accounting Standards Codification

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.

+ References

No definition available.

+ Details

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- Details

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- Details

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RELATED PARTY TRANSACTIONS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Jun. 30, 2013	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2014	Jul. 01, 2013
Related party transactions
Accounts payable to affiliates		$ 15		$ 15	$ 29
Amount included in receivables from related party		1		1
Bison
Related party transactions
Total cash call issued to fund debt repayment	24
Bison \| Former parent, TransCanada subsidiaries
Related party transactions
Capital contribution	18
Great Lakes
Related party transactions
Total cash call issued to fund debt repayment		10	9
Bison \| Former parent, TransCanada subsidiaries
Related party transactions
Ownership interest (as a percent)	75.00%
General Partner \| Reimbursement of costs of services provided
Related party transactions
Costs charged				3	3	3
TransCanada's subsidiaries \| GTN
Related party transactions
Accounts payable to affiliates		10		10	3
TransCanada's subsidiaries \| GTN \| Capital and operating costs
Related party transactions
Costs charged				30	28	29
Impact on the Partnership's net income attributable to controlling interests				19	19	19
Percentage of capital and operating costs charged				100.00%	100.00%	100.00%
TransCanada's subsidiaries \| Northern Border
Related party transactions
Accounts payable to affiliates		10		10	3
TransCanada's subsidiaries \| Northern Border \| Capital and operating costs
Related party transactions
Costs charged				35	30	31
Impact on the Partnership's net income attributable to controlling interests				16	14	14
Percentage of capital and operating costs charged				100.00%	100.00%	100.00%
TransCanada's subsidiaries \| Bison
Related party transactions
Accounts payable to affiliates		2		2
TransCanada's subsidiaries \| Bison \| Capital and operating costs
Related party transactions
Costs charged				6	5	6
Impact on the Partnership's net income attributable to controlling interests				4	4	4
Percentage of capital and operating costs charged				100.00%	100.00%	100.00%
TransCanada's subsidiaries \| Great Lakes
Related party transactions
Accounts payable to affiliates		9		9	3
Amount included in receivables from related party		15		15	11
TransCanada's subsidiaries \| Great Lakes \| Capital and operating costs
Related party transactions
Costs charged				30	31	33
Impact on the Partnership's net income attributable to controlling interests				13	14	15
Percentage of capital and operating costs charged				100.00%	100.00%	100.00%
TransCanada's subsidiaries \| Great Lakes \| Transportation contracts
Related party transactions
Revenues from related party				71	68	77
TransCanada's subsidiaries \| Great Lakes \| Transportation contracts \| Total revenues \| Major customers
Related party transactions
Percent of total revenues				49.00%	55.00%	42.00%
TransCanada's subsidiaries \| Great Lakes \| Affiliated rental revenue
Related party transactions
Revenues from related party				2	1	1
TransCanada's subsidiaries \| North Baja Pipeline, LLC
Related party transactions
Accounts payable to affiliates		1		1	1
TransCanada's subsidiaries \| North Baja Pipeline, LLC \| Capital and operating costs
Related party transactions
Costs charged				5	4	4
Impact on the Partnership's net income attributable to controlling interests				4	4	4
TransCanada's subsidiaries \| Tuscarora Gas Transmission Company
Related party transactions
Accounts payable to affiliates		1		1
TransCanada's subsidiaries \| Tuscarora Gas Transmission Company \| Capital and operating costs
Related party transactions
Costs charged				4	4	4
Impact on the Partnership's net income attributable to controlling interests				4	4	4
TransCanada's subsidiaries \| Great Lakes
Related party transactions
Revenue from TransCanada and its affiliates included in the Partnership's equity earnings				34	32	36
ANR Pipeline Company \| Great Lakes \| Seasonal firm service between Michigan and Wisconsin
Related party transactions
Deferred revenue		9.4		9.4
Bison \| Former parent, TransCanada subsidiaries \| Transaction between entities under common control
Related party transactions
Interest acquired by Partnership (as a percent)							30.00%	45.00%
GTN \| Former parent, TransCanada subsidiaries \| Transaction between entities under common control
Related party transactions
Interest acquired by Partnership (as a percent)								45.00%
GTN \| Former parent, TransCanada subsidiaries \| Transaction between entities under common control \| Accounts payable to affiliates
Related party transactions
Accrued additional consideration					$ 25