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

No definition available.

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

+ References

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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- Definition

The percentage of ownership interest in affiliate of Partnership.

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
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NONCONTROLLING INTERESTS (Narrative) (Details) - USD ($) $ in Millions			1 Months Ended	9 Months Ended
	Apr. 27, 2017	Jan. 26, 2017	Jan. 26, 2017	Sep. 30, 2017	Sep. 30, 2016
Proceeds from noncontrolling interests				$ 1,390.3	$ 62.4
Acquisition of noncontrolling interest in subsidiary		$ 360.0
Eastern Access project [Member]
Noncontrolling interest, ownership percentage by parent (in percent)				60.00%
Acquisition of noncontrolling interest in subsidiary		$ 360.0
Joint funding arrangement, additional acquisition percentage		15.00%	15.00%
Ownership interest in affiliate of Partnership (in percentage)				40.00%
Line 3 Replacement [Member]
Joint funding arrangement, parent (in percent)		99.00%	99.00%
Joint funding arrangement, funding percentage		1.00%	1.00%
Increase from sale of parent equity interest		$ 411.0	$ 411.0
Acquisition of noncontrolling interest in subsidiary		$ 39.1
General Partner [Member]
Proceeds from noncontrolling interests	$ 1,140.0
Noncontrolling interest, ownership percentage by parent (in percent)				75.00%
Increase from sale of parent equity interest				$ 0.8	$ 0.0
General Partner [Member] \| Enbridge Holdings LLC [Member]
Equity method investment, ownership percentage	75.00%
Noncontrolling interest, ownership percentage by parent (in percent)	25.00%