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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 9,843	$ 6,220	$ 2,394
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(135)	297
Net unrealized (loss) gain on derivatives, net of reclassifications			(446)
Net unrealized gain (loss) on investments, net of reclassifications	96	(10)	(58)
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(705)	(425)	419
Cumulative translation adjustment	96	(223)	401
Other comprehensive income (loss), net of taxes	(648)	(361)	316
Comprehensive Income Attributable to Merck & Co., Inc.	$ 9,195	$ 5,859	$ 2,710

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