Represents the term of debt available under public debt offering.

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Amount of potential cash payments that could result from the contingent consideration arrangement.

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Amount of cash paid to acquire the entity.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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Percentage of voting equity interests acquired in the business combination.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Increase of additional borrowings on existing and new debt instruments.

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Per-share or per-unit cash distributions declared to a common shareholder or unit-holder by an LLC or LP.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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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.

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The number of units or percentage investment held by the managing member or general partner of the LLC or LP.

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Increase for additional borrowings on the credit facility during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash or stock or unit payment to LLC member or LP limited partner after the end of an accounting period.

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

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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Cash inflow representing an adjustment to the purchase price of a previous acquisition.

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Price of a single share of a number of saleable stocks of a company.

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SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			6 Months Ended							0 Months Ended				0 Months Ended			0 Months Ended						0 Months Ended		0 Months Ended
	May 22, 2013 Common Units	May 22, 2013 General Partner	May 22, 2013 General Partner	Jun. 30, 2013 General Partner	Jun. 30, 2013 Senior revolving credit facility	May 03, 2011 Bison TransCanada Subsidiaries	Jun. 30, 2013 Great Lakes	Jun. 30, 2013 Northern Border	Jun. 30, 2013 GTN	Jun. 30, 2013 Bison	Jul. 02, 2013 Subsequent event Term loan	Jul. 02, 2013 Subsequent event Term Loan LIBOR borrowings LIBOR	Jul. 02, 2013 Subsequent event Term Loan LIBOR borrowings LIBOR Minimum	Jul. 02, 2013 Subsequent event Term Loan LIBOR borrowings LIBOR Maximum	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings Base rate	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings Base rate Minimum	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings Base rate Maximum	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings Prime rate	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings Federal funds rate	Jul. 02, 2013 Subsequent event Term Loan base rate borrowings LIBOR	Jul. 02, 2013 Subsequent event Senior revolving credit facility	Jul. 02, 2013 Subsequent event GTN and Bison TransCanada Subsidiaries	Jul. 02, 2013 Subsequent event GTN TransCanada Subsidiaries	Jul. 22, 2013 Subsequent event Bison TransCanada Subsidiaries	Jul. 02, 2013 Subsequent event Bison TransCanada Subsidiaries	Jul. 23, 2013 Subsequent event Distribution declared	Jul. 18, 2013 Subsequent event Distribution declared Great Lakes	Jul. 18, 2013 Subsequent event Distribution declared Northern Border	Jul. 18, 2013 Subsequent event Distribution declared GTN	Jul. 18, 2013 Subsequent event Distribution declared Bison	Aug. 01, 2013 Subsequent event Cash Distribution Paid Great Lakes Expected	Aug. 01, 2013 Subsequent event Cash Distribution Paid Northern Border Expected	Aug. 01, 2013 Subsequent event Cash Distribution Paid GTN Expected	Aug. 01, 2013 Subsequent event Cash Distribution Paid Bison Expected
Subsequent events
Interest acquired by the Partnership (as a percent)						25.00%																	45.00%		45.00%
Purchase price																						$ 1,050	$ 750		$ 300
Closing adjustments for working capital																						17
Acquired debt																							146
Cash paid																						921
Units sold in public offering	8,855,000
Price per common unit in public offering	$ 43.85
Net proceeds from issuance of common units	373
Maximum borrowing capacity					500						500										500
Borrowings under the facility											500
Term of the facility											5 years
Variable rate basis												LIBOR			Lender prime rate, federal funds rate or one-month LIBOR			Prime rate	Federal funds rate	one-month LIBOR
Basis spread on variable rate (as a percent)													1.125%	2.00%		0.125%	1.00%		0.50%	1.00%
Contingent consideration																						25
Capital contribution		8
Amount redrawn to finance a portion of the purchase price																					360
General partner ownership interest in the partnership (as a percent)			2.00%	2.00%
Amount received from TransCanada subsidiary as a post-closing construction expenditures adjustment																								1
Cash distribution (in dollars per unit)																										$ 0.81
Aggregate distribution declared and payable by investee																											7	44	27	16
Ownership interest (as a percent)							46.45%	50.00%	25.00%	25.00%																					46.45%	50.00%	70.00%	70.00%
Partnership's share of distributions declared and payable by investee																															$ 3	$ 22	$ 19	$ 11