EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Narrative (Details) - Stock options - $ / shares shares in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Antidilutive securities
Antidilutive securities excluded from the diluted earnings per common share calculation (in shares)	15.2	21.6	18.7	18.2
Weighted average exercise price of antidilutive securities (in Canadian dollars per share)	$ 55.56	$ 53.69	$ 54.18	$ 54.81

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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