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CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Sales $ 10,465 $ 9,930 $ 20,502 $ 19,365
Costs, Expenses and Other        
Materials and production 3,417 3,116 6,601 6,165
Marketing and administrative 2,508 2,500 5,016 4,972
Research and development 2,274 1,782 5,470 3,612
Restructuring costs 228 166 323 317
Other (income) expense, net (48) (73) (340) (143)
Total Costs, Expenses and Other 8,379 7,491 17,070 14,923
Income Before Taxes 2,086 2,439 3,432 4,442
Taxes on Income 370 488 975 935
Net Income 1,716 1,951 2,457 3,507
Less: Net Income Attributable to Noncontrolling Interests 9 5 14 11
Net Income Attributable to Merck & Co., Inc. $ 1,707 $ 1,946 $ 2,443 $ 3,496
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) $ 0.64 $ 0.71 $ 0.91 $ 1.28
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share) 0.63 0.71 0.90 1.27
Dividends Declared per Common Share (in dollars per share) $ 0.48 $ 0.47 $ 0.96 $ 0.94