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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 4,567	$ 2,941	$ 9,291	$ 9,161
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	84	(137)	324	(153)
Net unrealized loss on investments, net of reclassifications	0	0	0	(18)
Benefit plan net gain and prior service credit, net of amortization	38	62	1,522	161
Cumulative translation adjustment	(84)	85	(251)	(180)
Other comprehensive income (loss), net of taxes	38	10	1,595	(190)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 4,605	$ 2,951	$ 10,886	$ 8,971

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