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Earnings per share
12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Earnings per share Earnings per share
Year Ended December 31
(in millions of U.S. dollars, except share and per share data)202220212020
Numerator:
Net income$5,313 $8,539 $3,533 
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding419,779,847 439,968,422 451,602,820 
Denominator for diluted earnings per share:
Share-based compensation plans3,747,597 3,228,856 1,838,692 
Weighted-average shares outstanding
      and assumed conversions
423,527,444 443,197,278 453,441,512 
Basic earnings per share$12.66 $19.41 $7.82 
Diluted earnings per share$12.55 $19.27 $7.79 
Potential anti-dilutive share conversions1,467,840 1,532,066 6,811,966 

Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective years. These securities consisted of stock options in which the underlying exercise prices were greater than the average market prices of our Common Shares. Refer to Note 12 for additional information on stock options.