NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD shares in Millions, CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 7,597	CAD 577
Enbridge Energy Management, L.L.C. (EEM)
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 34	CAD 36
Ownership interest percentage held by noncontrolling owners	88.30%	88.30%
Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 157	CAD (99)
Ownership interest percentage held by noncontrolling owners	68.20%	80.20%
Enbridge Gas Distribution Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 100	CAD 100
Enbridge Gas Distribution Inc. \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)		4.0
Renewable energy assets
NONCONTROLLING INTERESTS
Noncontrolling interests	806	CAD 516
Spectra Energy Corp
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 5,385	0
Ownership interest percentage held by noncontrolling owners	25.70%
Union Gas Limited
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 110	0
Union Gas Limited \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	4.0
Westcoast Energy Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 1,005	0
Westcoast Energy Inc. \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	16.6
umber of first preferred shares held by noncontrolling owners (in shares)	12.0
Other noncontrolling interest
NONCONTROLLING INTERESTS
Noncontrolling interests	CAD 0	CAD 24
Magic Valley
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners		20.00%
Wildcat
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners	20.00%	20.00%
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners	22.00%

Represents the number of preferred stock held by the noncontrolling owners.

No definition available.

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- Definition

Minority Interest, Number of First Preferred Shares Held by Noncontrolling Owners

+ References

No definition available.

+ Details

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(22))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(24))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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