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EARNINGS PER COMMON SHARE
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
EARNINGS PER COMMON SHARE EARNINGS PER COMMON SHARE
BASIC
Earnings per common share is calculated by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding.

DILUTED
The treasury stock method is used to determine the dilutive impact of stock options and share-settled RSUs. This method assumes any proceeds from the exercise of stock options and vesting of share-settled RSUs would be used to purchase common shares at the average market price during the period.

Weighted average shares outstanding used to calculate basic and diluted earnings per common share are as follows:

December 31,202420232022
(number of shares in millions)   
Weighted average shares outstanding
2,155 2,056 2,025 
Effect of dilutive options and RSUs
3 2 4 
Diluted weighted average shares outstanding
2,158 2,058 2,029 

For the years ended December 31, 2024, 2023 and 2022, 14.6 million, 19.3 million and 10.4 million, respectively, of anti-dilutive stock options with a weighted average exercise price of $54.37, $54.42 and $56.49, respectively, were excluded from the diluted earnings per common share calculation.