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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Sales $ 14,487 $ 15,901
Costs, Expenses and Other    
Cost of sales 3,926 5,380
Selling, general and administrative 2,479 2,323
Research and development 4,276 2,576
Restructuring costs 67 53
Other (income) expense, net 89 708
Total Costs, Expenses and Other 10,837 11,040
Income Before Taxes 3,650 4,861
Taxes on Income 825 554
Net Income 2,825 4,307
Less: Net Income (Loss) Attributable to Noncontrolling Interests 4 (3)
Net Income Attributable to Merck & Co., Inc. $ 2,821 $ 4,310
Basic Earnings Per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.11 $ 1.70
Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.11 $ 1.70