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Earnings per share
 3 Months Ended
Mar. 31, 2023
Earnings Per Share [Abstract]  
Earnings per share Earnings per share
Three Months Ended
March 31
20232022
(in millions of U.S. dollars, except share and per share data)As Adjusted
Numerator:
Net income$1,892 $1,953 
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding414,289,150 425,805,105 
Denominator for diluted earnings per share:
Share-based compensation plans3,639,042 3,985,729 
Weighted-average shares outstanding and assumed conversions
417,928,192 429,790,834 
Basic earnings per share$4.57 $4.59 
Diluted earnings per share$4.53 $4.55 
Potential anti-dilutive share conversions1,731,523 681,032 

Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods. 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 to the Consolidated Financial Statements of our 2022 Form 10-K for additional information on stock options.