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Earnings Per Share
 6 Months Ended
Jun. 30, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The calculations of earnings per share are as follows:
 Three Months Ended
June 30,		Six Months Ended
June 30,
($ and shares in millions except per share amounts)2025202420252024
Net Income Attributable to Merck & Co., Inc.
$4,427 $5,455 $9,506 $10,217 
Average common shares outstanding2,510 2,534 2,516 2,534 
Common shares issuable (1)
3 10 6 10 
Average common shares outstanding assuming dilution 2,513 2,544 2,522 2,544 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders
$1.76 $2.15 $3.78 $4.03 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders
$1.76 $2.14 $3.77 $4.02 
(1)    Issuable primarily under share-based compensation plans.
For the second quarter of 2025 and 2024, 19 million and 7 million, respectively, and for the first six months of 2025 and 2024, 12 million and 5 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.