INTANGIBLE ASSETS (Details) (CAD) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTANGIBLE ASSETS
Cost	1,626	1,340
Accumulated Amortization	460	336
Finite-Lived Intangible Assets, Net, Total	1,166us-gaap_FiniteLivedIntangibleAssetsNet	1,004us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expenses
Total amortization expense for intangible assets	106us-gaap_AmortizationOfIntangibleAssets	82us-gaap_AmortizationOfIntangibleAssets	64us-gaap_AmortizationOfIntangibleAssets
Expected aggregate amortization expense
2015	109
2016	96
2017	85
2018	76
2019	67
Software
INTANGIBLE ASSETS
Weighted Average Amortization Rate (as a percent)	12.90%	13.20%
Cost	1,049	825
Accumulated Amortization	337	241
Finite-Lived Intangible Assets, Net, Total	712	584
Natural gas supply opportunities
INTANGIBLE ASSETS
Weighted Average Amortization Rate (as a percent)	3.70%	3.70%
Cost	340	311
Accumulated Amortization	83	65
Finite-Lived Intangible Assets, Net, Total	257	246
Power purchase agreements
INTANGIBLE ASSETS
Weighted Average Amortization Rate (as a percent)	3.80%	4.00%
Cost	96	87
Accumulated Amortization	10	7
Finite-Lived Intangible Assets, Net, Total	86	80
Transportation agreements
INTANGIBLE ASSETS
Weighted Average Amortization Rate (as a percent)	3.70%	3.70%
Cost	56	53
Accumulated Amortization	18	15
Finite-Lived Intangible Assets, Net, Total	38	38
Other.
INTANGIBLE ASSETS
Weighted Average Amortization Rate (as a percent)	3.60%	4.00%
Cost	85	64
Accumulated Amortization	12	8
Finite-Lived Intangible Assets, Net, Total	73	56

Represents the weighted average amortization rate for intangible assets of the entity.

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References