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Collaborative Arrangements - Moderna, Inc. - Narrative (Details) - Moderna - Collaborative Arrangement, Transaction with Party to Collaborative Arrangement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contractual payment	$ 250
Capitalization of shared costs		$ 198

X

- Definition

Collaborative Arrangement, Rights And Obligations, Contractual Payment

+ References

No definition available.

+ Details

Name:	mrk_CollaborativeArrangementRightsAndObligationsContractualPayment
Namespace Prefix:	mrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=mrk_ModernaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: