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Percentage of voting equity interests held in the business combination.

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Represents the amount of acquisition cost of a business combination allocated to accounts receivable and other.

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Represents the amount of acquisition cost of a business combination allocated to working capital.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Percentage of voting equity interests acquired in the business combination.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to current assets.

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The amount of cash and cash equivalents acquired in a business combination.

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The amount of acquisition cost of a business combination allocated to notes payables and long-term debt assumed from the acquired entity.

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Amount of acquisition cost of a business combination allocated to other assets not separately disclosed in the balance sheet.

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Amount of acquisition cost of a business combination allocated to other noncurrent liabilities not separately disclosed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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For an acquired entity, price of a single share of a number of saleable stocks of a company.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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ACQUISITIONS (Details) In Millions, except Per Share data, unless otherwise specified	12 Months Ended						3 Months Ended	12 Months Ended				1 Months Ended								12 Months Ended
	Dec. 31, 2012 CAD	Dec. 31, 2011 CAD	Dec. 31, 2010 CAD	Dec. 31, 2012 Silver State North Solar Project CAD	Mar. 22, 2012 Silver State North Solar Project USD ($)	Mar. 22, 2012 Silver State North Solar Project CAD	Dec. 31, 2011 Tonbridge Power Inc. CAD	Dec. 31, 2011 Tonbridge Power Inc. CAD	Oct. 14, 2011 Tonbridge Power Inc. CAD	Sep. 16, 2010 Elk City Natural Gas Gathering and Processing System USD ($)	Sep. 16, 2010 Elk City Natural Gas Gathering and Processing System CAD	Sep. 30, 2010 Elk City Natural Gas Gathering and Processing System Minimum	Sep. 30, 2010 Elk City Natural Gas Gathering and Processing System Maximum	Dec. 31, 2010 Other acquisitions USD ($)	Dec. 31, 2010 Other acquisitions CAD	Dec. 31, 2012 Greenwich CAD	May 31, 2012 Greenwich CAD	Oct. 31, 2011 Talbot Windfarm, LP (Talbot) CAD	Aug. 31, 2010 Olympic Pipe Line Company CAD	Dec. 31, 2010 Hardisty Caverns Limited Partnership CAD	Jun. 30, 2010 Hardisty Caverns Limited Partnership CAD	Dec. 31, 2010 EGNB limited partnership CAD	Nov. 30, 2012 Sour gas gathering and compression facilities CAD
ACQUISITIONS
Ownership interest acquired (as a percent)					100.00%	100.00%			100.00%	100.00%	100.00%						10.00%	10.00%	20.00%		50.00%	27.50%
Outstanding common shares	805	781							36
Share price (in canadian dollars per share)									0.54
Cash consideration					$ 190	195			5	$ 686	705			$ 27	29	27	27	28	12		52	52
Purchase price									20														118
Fair value of net assets acquired:
Current assets											4
Working capital deficiency									(5)
Accounts receivable and other					55	54
Property, plant and equipment						141			196		503
Intangible assets									17		194
Other assets											5
Long-term debt									(182)
Other long-term liabilities									(21)		(1)
Net assets acquired						195			5		705
Purchase Price:
Cash consideration					190	195			5	686	705			27	29	27	27	28	12		52	52
Cash acquired									15
Additional information
Revenues	25,306	27,053	21,520	10
Earnings (Net loss)	943	1,242	781	1			(1)
Unaudited proforma net loss								38
Pro forma transaction costs							6	6
Weighted average estimated useful life of intangible assets acquired												25 years	30 years
Ownership Interest (as a percent)																	100.00%	100.00%	85.00%		100.00%	100.00%
Gain on original equity interest re-measured to fair value			22																	22