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

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

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

VARIABLE INTEREST ENTITIES - UNCONSOLIDATED VARIABLE INTEREST ENTITIES (Narrative) (Details) - Variable Interest Entity, Not Primary Beneficiary	1 Months Ended
	Sep. 30, 2020	Dec. 31, 2018
Enbridge Eolien France 2 S.a.r.l
Variable Interest Entity [Line Items]
Interest acquired (as a percent)	50.00%
Gray Oak Crude Oil Pipeline
Variable Interest Entity [Line Items]
Interest acquired (as a percent)		22.80%
Gray Oak Holdings LLC
Variable Interest Entity [Line Items]
Interest acquired (as a percent)		35.00%