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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 5,079	$ 4,762
Other Comprehensive Loss Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(217)	130
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(18)	(5)
Cumulative translation adjustment	215	(238)
Other comprehensive income (loss), net of taxes	(20)	(113)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 5,059	$ 4,649

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