VARIABLE INTEREST ENTITIES - CONSOLIDATED VARIABLE INTEREST ENTITIES (Narrative) (Details)	12 Months Ended
Dec. 31, 2020
DakTex
Schedule of Equity Method Investments [Line Items]
Ownership interest in subsidiary (as a percent)	75.00%
DakTex \| EEP
Schedule of Equity Method Investments [Line Items]
Ownership interest in subsidiary (as a percent)	25.00%
Variable Interest Entity, Primary Beneficiary \| Enbridge Canadian Renewable LP (ECRLP)
Schedule of Equity Method Investments [Line Items]
Interest acquired (as a percent)	51.00%
Variable Interest Entity, Primary Beneficiary \| Bakken Pipeline System
Schedule of Equity Method Investments [Line Items]
Ownership interest of equity method investment (as a percent)	27.60%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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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.

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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

No definition available.

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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