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Earnings Per Share
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The calculations of earnings per share are as follows:
 Three Months Ended
September 30,		Nine Months Ended
September 30,
($ and shares in millions except per share amounts)2025202420252024
Net Income Attributable to Merck & Co., Inc.
$5,785 $3,157 $15,291 $13,374 
Average common shares outstanding2,495 2,534 2,509 2,534 
Common shares issuable (1)
3 7 5 9 
Average common shares outstanding assuming dilution 2,498 2,541 2,514 2,543 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders
$2.32 $1.25 $6.09 $5.28 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders
$2.32 $1.24 $6.08 $5.26 
(1)    Issuable primarily under share-based compensation plans.
For the third quarter of 2025 and 2024, 15 million and 7 million, respectively, and for the first nine months of 2025 and 2024, 12 million and 6 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.