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

No definition available.

Name:	enb_MinorityInterestNumberOfRedeemablePreferredSharesHeldByNoncontrollingOwners
Namespace Prefix:	enb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	enb_MinorityInterestNumberofFirstPreferredSharesHeldbyNoncontrollingOwners
Namespace Prefix:	enb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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

- 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

Name:	us-gaap_MinorityInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD ($) shares in Millions, $ in Millions	Nov. 29, 2018	Dec. 31, 2018	Aug. 01, 2018	Dec. 31, 2017
NONCONTROLLING INTERESTS
Noncontrolling interests		$ 3,965		$ 7,597
Algonquin Gas Transmission LLC
NONCONTROLLING INTERESTS
Noncontrolling interests		518		476
Enbridge Energy Management, L.L.C. (EEM)
NONCONTROLLING INTERESTS
Noncontrolling interests		0		34
Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Noncontrolling interests		0		138
Enbridge Gas Distribution Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests		0		100
Enbridge Gas Distribution Inc. \| Preference shares
NONCONTROLLING INTERESTS
Stock redeemed during period (in shares)	4.0
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Noncontrolling interests		613		572
Renewable energy assets
NONCONTROLLING INTERESTS
Noncontrolling interests		1,961		806
Spectra Energy
NONCONTROLLING INTERESTS
Noncontrolling interests		0		4,335
Union Gas Limited
NONCONTROLLING INTERESTS
Noncontrolling interests		0		110
Union Gas Limited \| Preference shares
NONCONTROLLING INTERESTS
Stock redeemed during period (in shares)	4.0
Westcoast Energy Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests		$ 841		$ 1,005
Westcoast Energy Inc. \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)		16.6
Number of first preferred shares held by noncontrolling owners (in shares)				12.0
Other Non Controlling Interest
NONCONTROLLING INTERESTS
Noncontrolling interests		$ 32		$ 21
Enbridge Energy Management, L.L.C. (EEM)
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners				88.30%
Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners				68.20%
Canadian Renewable Assets \| Discontinued Operations, Disposed of by Sale
NONCONTROLLING INTERESTS
Noncontrolling interest, ownership percentage by parent			49.00%
Magic Valley
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners		20.00%		20.00%
Spectra Energy \| Spectra Energy
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners				25.70%
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners		22.00%
Wildcat
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners		20.00%		20.00%