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Earnings Per Share
 3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The calculations of earnings per share are as follows:
 Three Months Ended
March 31,
($ and shares in millions except per share amounts)20222021
Net Income from Continuing Operations Attributable to Merck & Co., Inc.$4,310 $2,745 
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests— 434 
Net Income Attributable to Merck & Co., Inc.$4,310 $3,179 
Average common shares outstanding2,528 2,531 
Common shares issuable (1)
9 10 
Average common shares outstanding assuming dilution 2,537 2,541 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.70 $1.08 
Income from Discontinued Operations— 0.17 
Net Income$1.70 $1.26 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.70 $1.08 
Income from Discontinued Operations— 0.17 
Net Income$1.70 $1.25 
(1)Issuable primarily under share-based compensation plans.
For the first quarter of 2022 and 2021, 7 million and 14 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.