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Earnings per Share
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
The calculations of earnings per share (shares in millions) are as follows:
Years Ended December 31202420232022
Net Income Attributable to Merck & Co., Inc.$17,117 $365 $14,519 
Average common shares outstanding2,532 2,537 2,532 
Common shares issuable (1)
9 10 10 
Average common shares outstanding assuming dilution2,541 2,547 2,542 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders
$6.76 $0.14 $5.73 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders
$6.74 $0.14 $5.71 
(1)     Issuable primarily under share-based compensation plans.
In 2024, 2023 and 2022, 6 million, 5 million and 2 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computation of earnings per common share assuming dilution because the effect would have been antidilutive.