It represents the additional percentage acquired in a joint funding arrangement.

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Represents the percentage of the entity's funding in a joint funding arrangement.

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No definition available.

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Represents the percentage of parent entity's funding in a joint funding arrangement

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No definition available.

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The percentage of ownership interest in affiliate of Partnership.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 50
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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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-Publisher FASB
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NONCONTROLLING INTERESTS (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Apr. 27, 2017	Jan. 26, 2017	Jun. 30, 2017	Jun. 30, 2016
Acquisition of noncontrolling interest in subsidiary		$ 360.0
Proceeds from Noncontrolling Interests			$ 1,285.0	$ 81.9
General Partner [Member]
Noncontrolling Interest, Increase from Sale of Parent Equity Interest			$ 0.8	$ 0.0
Proceeds from Noncontrolling Interests	$ 1,140.0
Enbridge Holdings LLC [Member] \| General Partner [Member]
Equity Method Investment, Ownership Percentage	75.00%
Noncontrolling Interest, Ownership Percentage by Parent	25.00%
Eastern Access project [Member]
Joint Funding Arrangement, Additional Acquisition Percentage		15.00%
Noncontrolling Interest, Ownership Percentage by Parent			60.00%
Acquisition of noncontrolling interest in subsidiary		$ 360.0
Ownership Interest In Affiliate Of Partnership			40.00%
Line 3 Replacement [Member]
Joint Funding Arrangement, Funding Percentage		1.00%
Joint Funding Arrangement, Parent, Percentage		99.00%
Acquisition of noncontrolling interest in subsidiary		$ 39.1
Noncontrolling Interest, Increase from Sale of Parent Equity Interest		$ 411.0