ASSET RETIREMENT OBLIGATIONS (Details) (CAD) In Millions, unless otherwise specified	Jun. 30, 2014
Asset retirement obligation
Asset retirement obligation (ARO)	168
Accounts payable and other
Asset retirement obligation
Asset retirement obligation (ARO)	64
Other long-term liabilities
Asset retirement obligation
Asset retirement obligation (ARO)	104
Line 3 Replacement Program
Asset retirement obligation
Asset retirement obligation (ARO)	104
EEP \| Decommissioning of certain portions of line 6B lakehead system
Asset retirement obligation
Asset retirement obligation (ARO)	64

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.

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

Name:	us-gaap_AssetRetirementObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant