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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 7,067	$ 9,843	$ 6,220
Other Comprehensive Loss Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(297)	(135)	297
Net unrealized (loss) gain on investments, net of reclassifications	(18)	96	(10)
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(279)	(705)	(425)
Cumulative translation adjustment	153	96	(223)
Other comprehensive income (loss), net of taxes	(441)	(648)	(361)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 6,626	$ 9,195	$ 5,859

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