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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Sales $ 15,529 $ 15,775
Costs, Expenses and Other    
Cost of sales 3,419 3,540
Selling, general and administrative 2,552 2,483
Research and development 3,621 3,992
Restructuring costs 69 123
Other (income) expense, net (35) (33)
Total Costs, Expenses and Other 9,626 10,105
Income Before Taxes 5,903 5,670
Taxes on Income 818 903
Net Income 5,085 4,767
Less: Net Income Attributable to Noncontrolling Interests 6 5
Net Income Attributable to Merck & Co., Inc. $ 5,079 $ 4,762
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 2.01 $ 1.88
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 2.01 $ 1.87