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Earnings Per Share
 9 Months Ended
Sep. 30, 2022
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)2022202120222021
Net Income from Continuing Operations Attributable to Merck & Co., Inc.$3,248 $4,567 $11,502 $8,525 
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests— — — 766 
Net Income Attributable to Merck & Co., Inc.$3,248 $4,567 $11,502 $9,291 
Average common shares outstanding2,533 2,530 2,531 2,531 
Common shares issuable (1)
9 6 9 8 
Average common shares outstanding assuming dilution 2,542 2,536 2,540 2,539 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.28 $1.81 $4.55 $3.37 
Income from Discontinued Operations— — — 0.30 
Net Income$1.28 $1.81 $4.55 $3.67 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.28 $1.80 $4.53 $3.36 
Income from Discontinued Operations— — — 0.30 
Net Income$1.28 $1.80 $4.53 $3.66 
(1)Issuable primarily under share-based compensation plans.
For the third quarter of 2022 and 2021, 2 million and 8 million, respectively, and for the first nine months of 2022 and 2021, 5 million and 10 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.