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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 2,915	$ 736
Other Comprehensive Income Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(48)	(70)
Net unrealized gain (loss) on investments, net of reclassifications	82	(99)
Benefit plan net gain and prior service credit, net of amortization	15	36
Cumulative translation adjustment	150	257
Other comprehensive income (loss), net of taxes	199	124
Comprehensive Income Attributable to Merck & Co., Inc.	$ 3,114	$ 860

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