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Consolidated Statement of Equity - USD ($)
$ in Millions
Total
Common Stock
Other Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Non- controlling Interests
Beginning Balance at Dec. 31, 2014 $ 48,791 $ 1,788 $ 40,423 $ 46,021 $ (4,323) $ (35,262) $ 144
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income Attributable to Merck & Co., Inc. 4,442     4,442      
Other comprehensive income (loss), net of taxes 175       175    
Cash dividends declared on common stock ($1.89 per share in 2017, $1.85 per share in 2016 and $1.81 per share in 2015) (5,115)     (5,115)      
Treasury stock shares purchased (4,186)         (4,186)  
Changes in noncontrolling ownership interests (75)   (20)       (55)
Net income attributable to noncontrolling interests 17           17
Distributions attributable to noncontrolling interests (15)           (15)
Share-based compensation plans and other 733   (181)     914  
Ending Balance at Dec. 31, 2015 44,767 1,788 40,222 45,348 (4,148) (38,534) 91
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income Attributable to Merck & Co., Inc. 3,920     3,920      
Other comprehensive income (loss), net of taxes (1,078)       (1,078)    
Cash dividends declared on common stock ($1.89 per share in 2017, $1.85 per share in 2016 and $1.81 per share in 2015) (5,135)     (5,135)      
Treasury stock shares purchased (3,434)         (3,434)  
Changes in noncontrolling ownership interests 124           124
Net income attributable to noncontrolling interests 21           21
Distributions attributable to noncontrolling interests (16)           (16)
Share-based compensation plans and other 1,139   (283)     1,422  
Ending Balance at Dec. 31, 2016 40,308 1,788 39,939 44,133 (5,226) (40,546) 220
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income Attributable to Merck & Co., Inc. 2,394     2,394      
Other comprehensive income (loss), net of taxes 316       316    
Cash dividends declared on common stock ($1.89 per share in 2017, $1.85 per share in 2016 and $1.81 per share in 2015) (5,177)     (5,177)      
Treasury stock shares purchased (4,014)         (4,014)  
Changes in noncontrolling ownership interests 7           7
Net income attributable to noncontrolling interests 24           24
Distributions attributable to noncontrolling interests (18)           (18)
Share-based compensation plans and other 729   (37)     766  
Ending Balance at Dec. 31, 2017 $ 34,569 $ 1,788 $ 39,902 $ 41,350 $ (4,910) $ (43,794) $ 233