v3.25.4
Earnings per Share
 12 Months Ended
Dec. 31, 2025
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 31202520242023
Net Income Attributable to Merck & Co., Inc.$18,254 $17,117 $365 
Average common shares outstanding2,502 2,532 2,537 
Common shares issuable (1)
5 9 10 
Average common shares outstanding assuming dilution2,507 2,541 2,547 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders$7.30 $6.76 $0.14 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders$7.28 $6.74 $0.14 
(1)     Issuable primarily under share-based compensation plans.
In 2025, 2024 and 2023, 11 million, 6 million and 5 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.