ACQUISITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - The East Ohio Gas Company $ in Millions	3 Months Ended
Mar. 31, 2024 CAD ($)
Business Acquisition [Line Items]
Operating revenues	$ 11,346
Earnings attributable to common shareholders	$ 1,476

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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