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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Narrative (Details) - Stock Options - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Antidilutive securities        
Anti-dilutive stock options excluded from diluted earnings per common share calculation (in shares) 0 15,200,000 1,600,000 18,700,000
Weighted average exercise price of antidilutive securities (in Canadian dollars per share)   $ 55.56 $ 60.37 $ 54.18