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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,707	$ 1,946	$ 2,443	$ 3,496
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	266	(143)	196	(375)
Net unrealized gain (loss) on investments, net of reclassifications	3	35	(96)	78
Benefit plan net gain and prior service credit, net of amortization	30	47	66	73
Cumulative translation adjustment	(361)	47	(104)	356
Other comprehensive income (loss), net of taxes	(62)	(14)	62	132
Comprehensive Income Attributable to Merck & Co., Inc.	$ 1,645	$ 1,932	$ 2,505	$ 3,628

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