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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Sales $ 15,775 $ 14,487
Costs, Expenses and Other    
Cost of sales 3,540 3,926
Selling, general and administrative 2,483 2,479
Research and development 3,992 4,276
Restructuring costs 123 67
Other (income) expense, net (33) 89
Total Costs, Expenses and Other 10,105 10,837
Income Before Taxes 5,670 3,650
Taxes on Income 903 825
Net Income 4,767 2,825
Less: Net Income Attributable to Noncontrolling Interests 5 4
Net Income Attributable to Merck & Co., Inc. $ 4,762 $ 2,821
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.88 $ 1.11
Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.87 $ 1.11