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VARIABLE INTEREST ENTITIES - UNCONSOLIDATED (Details) - CAD CAD in Millions		1 Months Ended	6 Months Ended
	Feb. 27, 2017	Jun. 30, 2017	Jun. 30, 2017
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity, Not Primary Beneficiary
Carrying Amount of Investment in VIE		CAD 718	CAD 718
Maximum Exposure to Loss		1,697	1,697
Nexus Gas Transmission, LLC
Variable Interest Entity, Not Primary Beneficiary
Carrying Amount of Investment in VIE		662	662
Maximum Exposure to Loss		1,342	1,342
PennEast Pipeline Company, LLC
Variable Interest Entity, Not Primary Beneficiary
Carrying Amount of Investment in VIE		56	56
Maximum Exposure to Loss		CAD 355	CAD 355
Spectra Energy Partners, LP | Nexus Gas Transmission, LLC
Variable Interest Entity, Not Primary Beneficiary
Ownership interest in VIE (as a percent)			50.00%
Spectra Energy Partners, LP | PennEast Pipeline Company, LLC
Variable Interest Entity, Not Primary Beneficiary
Ownership interest in VIE (as a percent)	10.00%	20.00%

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685

+ Details

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- Details

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X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=enb_NexusGasTransmissionLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=enb_PenneastPipelineCompanyLLCMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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