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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 2,821	$ 4,310
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(133)	63
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(50)	32
Cumulative translation adjustment	68	(35)
Other comprehensive income (loss), net of taxes	(115)	60
Comprehensive Income Attributable to Merck & Co., Inc.	$ 2,706	$ 4,370

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