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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 3,219	$ 2,915
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	104	(48)
Net unrealized (loss) gain on investments, net of reclassifications	(18)	82
Benefit plan net gain and prior service credit, net of amortization	60	15
Cumulative translation adjustment	(344)	150
Other comprehensive income (loss), net of taxes	(198)	199
Comprehensive Income Attributable to Merck & Co., Inc.	$ 3,021	$ 3,114

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