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Earnings Per Share
 6 Months Ended
Jun. 30, 2022
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)2022202120222021
Net Income from Continuing Operations Attributable to Merck & Co., Inc.$3,944 $1,213 $8,254 $3,958 
Income from Discontinued Operations, Net of Taxes and Amounts Attributable to Noncontrolling Interests— 332 — 766 
Net Income Attributable to Merck & Co., Inc.$3,944 $1,545 $8,254 $4,724 
Average common shares outstanding2,531 2,533 2,529 2,532 
Common shares issuable (1)
9 7 9 8 
Average common shares outstanding assuming dilution 2,540 2,540 2,538 2,540 
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.56 $0.48 $3.26 $1.56 
Income from Discontinued Operations— 0.13 — 0.30 
Net Income$1.56 $0.61 $3.26 $1.87 
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders:
Income from Continuing Operations$1.55 $0.48 $3.25 $1.56 
Income from Discontinued Operations— 0.13 — 0.30 
Net Income$1.55 $0.61 $3.25 $1.86 
(1)Issuable primarily under share-based compensation plans.
For the second quarter of 2022 and 2021, 2 million and 12 million, respectively, and for the first six months of 2022 and 2021, 6 million and 11 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.