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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Sales $ 12,080 $ 12,057
Costs, Expenses and Other    
Cost of sales 3,670 3,312
Selling, general and administrative 2,633 2,555
Research and development 2,465 2,209
Restructuring costs 298 72
Other (income) expense, net (448) 71
Total Costs, Expenses and Other 8,618 8,219
Income Before Taxes 3,462 3,838
Taxes on Income 276 619
Net Income 3,186 3,219
Less: Net Income Attributable to Noncontrolling Interests 7 0
Net Income Attributable to Merck & Co., Inc. $ 3,179 $ 3,219
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.26 $ 1.27
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 1.25 $ 1.26