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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Sales $ 10,037 $ 9,434
Costs, Expenses and Other    
Materials and production 3,184 3,049
Marketing and administrative 2,508 2,472
Research and development 3,196 1,830
Restructuring costs 95 151
Other (income) expense, net (291) (71)
Total Costs, Expenses and Other 8,692 7,431
Income Before Taxes 1,345 2,003
Taxes on Income 604 447
Net Income 741 1,556
Less: Net Income Attributable to Noncontrolling Interests 5 5
Net Income Attributable to Merck & Co., Inc. $ 736 $ 1,551
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 0.27 $ 0.56
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) 0.27 0.56
Dividends Declared per Common Share (in dollars per share) $ 0.48 $ 0.47