ASSET RETIREMENT OBLIGATIONS (Details) (CAD) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Asset retirement obligations current	53
Asset retirement obligations non-current	132	24
Asset Retirement Obligation, Total	185us-gaap_AssetRetirementObligation	24us-gaap_AssetRetirementObligation
Discount rate		8.10%
Asset retirement obligation roll forward
Asset Retirement Obligation, Beginning Balance	24us-gaap_AssetRetirementObligation	23us-gaap_AssetRetirementObligation
Liabilities incurred	177
Liabilities settled	(24)
Foreign currency translation adjustment	5
Accretion expense	3	1
Asset Retirement Obligation, Ending Balance	185us-gaap_AssetRetirementObligation	24us-gaap_AssetRetirementObligation
Minimum
Discount rate	4.60%
Maximum
Discount rate	8.10%
Accounts payable and other
Asset retirement obligations current	53
Other long-term liabilities
Asset retirement obligations non-current	132	24
Line 3 Replacement Program
Asset retirement obligation roll forward
Liabilities incurred	103
The fund
Asset Retirement Obligation, Total	21	20
Asset retirement obligation roll forward
Asset Retirement Obligation, Ending Balance	21	20
EEP \| Decommissioning of certain portions of line 6B lakehead system
Asset retirement obligation roll forward
Liabilities incurred	74

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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