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Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pay vs Performance Disclosure
Net Income Attributable to Merck & Co., Inc.	$ 4,427	$ 5,455	$ 9,506	$ 10,217

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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