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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Diluted (Details) - $ / shares
shares in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Weighted average number of common shares outstanding diluted    
Weighted average shares outstanding (in shares) 2,026.0 2,022.0
Effect of dilutive options (in shares) 3.0 1.0
Diluted weighted average shares outstanding (in shares) 2,029.0 2,023.0
Stock options    
Weighted average number of common shares outstanding diluted    
Antidilutive securities excluded from the diluted earnings per common share calculation (in shares) 12.9 27.6
Weighted average exercise price of antidilutive securities (in Canadian dollars per share) $ 56.09 $ 51.42