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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 2,670	$ 1,707	$ 5,585	$ 2,443
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(52)	266	(100)	196
Net unrealized gain (loss) on investments, net of reclassifications	44	3	126	(96)
Benefit plan net gain and prior service credit, net of amortization	11	30	26	66
Cumulative translation adjustment	(19)	(361)	131	(104)
Other comprehensive income (loss), net of taxes	(16)	(62)	183	62
Comprehensive Income Attributable to Merck & Co., Inc.	$ 2,654	$ 1,645	$ 5,768	$ 2,505

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