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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to Merck & Co., Inc.	$ 3,219	$ 2,915
Average common shares outstanding	2,533	2,585
Common shares issuable (1)	14	18
Average common shares outstanding assuming dilution	2,547	2,603
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$ 1.27	$ 1.13
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$ 1.26	$ 1.12
Common shares issuable under share-based compensation plans excluded from diluted earnings per common share because the effect would have been antidilutive (in shares)	2	2

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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