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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - REGULATION (Details) CAD in Millions | Dec. 31, 2016 CAD
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Deferral for Depreciation for Phase-In Plans under U.S. GAAP Guidance |
REGULATION |
Regulatory assets | CAD 0

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

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RegulatoryAssetAxis=enb_DeferralForNegotiatedDepreciationRatesForPhaseInPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |