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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 4,762	$ 2,821
Other Comprehensive Loss Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	130	(133)
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(5)	(50)
Cumulative translation adjustment	(238)	68
Other comprehensive income (loss), net of taxes	(113)	(115)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 4,649	$ 2,706

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