REGULATORY MATTERS - Enbridge Gas Distribution Inc. (Narrative) (Details) - Enbridge Gas Distribution	12 Months Ended
Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Term of incentive regulation framework	5 years
Inflation stretch factor (percent)	0.30%

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.

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