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Earnings Per Share
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The calculations of earnings per share are as follows:
 Three Months Ended
March 31,
($ and shares in millions except per share amounts)20242023
Net Income Attributable to Merck & Co., Inc.$4,762 $2,821 
Average common shares outstanding2,533 2,538 
Common shares issuable (1)
11 13 
Average common shares outstanding assuming dilution 2,544 2,551 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders$1.88 $1.11 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders$1.87 $1.11 
(1)    Issuable primarily under share-based compensation plans.
For the first quarter of 2024 and 2023, 3 million and 1 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computations of earnings per common share assuming dilution because the effect would have been antidilutive.