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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 3,179	$ 3,219
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized gain on derivatives, net of reclassifications	230	104
Net unrealized loss on investments, net of reclassifications	0	(18)
Benefit plan net gain and prior service credit, net of amortization	81	60
Cumulative translation adjustment	(299)	(344)
Other comprehensive income (loss), net of taxes	12	(198)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 3,191	$ 3,021

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