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DISPOSITIONS (Details) $ in Millions, $ in Billions			6 Months Ended
DISPOSITIONS (Details) $ in Millions, $ in Billions	Aug. 01, 2018 CAD ($)	May 09, 2018 CAD ($)	Jun. 30, 2018 CAD ($)	Jun. 30, 2017 CAD ($)	Jun. 30, 2019 CAD ($)	Dec. 31, 2018 CAD ($)	Aug. 01, 2018 USD ($)	Jul. 04, 2018 CAD ($)	May 09, 2018 USD ($)	Dec. 31, 2017 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill			$ 35,436							$ 34,457
Deferred income tax recovery			328	$ (416)
Disposal Group, Held-for-sale, Not Discontinued Operations \| Texas Express NGL System
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying amount of investment			447
Goodwill			262
Asset Impairment \| Disposal Group, Held-for-sale, Not Discontinued Operations \| Midcoast Operating L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for loss (gain) on disposal, before income tax			913
Provision for loss (gain) on disposal, net of tax			701
Asset Impairment \| Disposal Group, Held-for-sale, Not Discontinued Operations \| Line 10 Crude Oil Pipeline
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for loss (gain) on disposal, before income tax			154
Provision for loss (gain) on disposal, net of tax			95
Enbridge (U.S.) Inc. \| Disposal Group, Held-for-sale, Not Discontinued Operations \| Midcoast Operating L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration									$ 1.1
Subsequent Event \| Disposal Group, Held-for-sale, Not Discontinued Operations \| Canadian Natural Gas Gathering and Processing Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration								$ 4,310
Subsequent Event \| Enbridge (U.S.) Inc. \| Disposed of by sale, not discontinued operations \| Midcoast Operating L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration							$ 1.1
Scenario, Forecast \| Disposed of by sale, not discontinued operations \| Canadian Natural Gas Gathering and Processing Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration					$ 1,800	$ 2,500
CANADA \| Renewable Energy Assets \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent									49.00%
UNITED STATES \| Renewable Energy Assets \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent									49.00%
Hohe See Offshore Wind Project \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in equity investment (as a percent)									49.00%
The Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent									51.00%
Proceeds from sale of equity method investments		$ 1,750
Deferred income tax recovery			190
The Assets \| Renewable Energy Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred income tax recovery			$ 258
The Assets \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of equity method investments	$ 1,750