RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - CREDIT RISK (Details) - CAD CAD in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Credit concentrations with respect to derivative instruments
Period after which receivables are classified as past due	30 days
Derivative instruments
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	CAD 794	CAD 809
Letters of credit provided in lieu of providing cash collateral to counterparties	325
Cash collateral on asset exposure	0	17
Derivative instruments \| Canadian financial institutions
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	40	47
Derivative instruments \| United States financial institutions
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	281	450
Derivative instruments \| European financial institutions
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	107	95
Derivative instruments \| Asian Financial Institutions Member
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	10	4
Derivative instruments \| Other
Credit concentrations with respect to derivative instruments
Maximum credit exposure with respect to derivative instruments	CAD 356	CAD 213

Represents the period after which receivables are classified as past due.

No definition available.

Name:	enb_PeriodAfterWhichReceivablesClassifiedAsPastDue
Namespace Prefix:	enb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ 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 210.9-03.1)
-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),2)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

+ Details

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

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DerivativeMember
Namespace Prefix:
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- Details

Name:	us-gaap_CounterpartyNameAxis=enb_CanadianFinancialInstitutionsMember
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- Details

Name:	us-gaap_CounterpartyNameAxis=enb_USFinancialInstitutionsMember
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_CounterpartyNameAxis=enb_AsianFinancialInstitutionsMember
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- Details

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