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Contingencies Contingencies - Commercial and Other Litigation - Narrative (Details) $ in Millions	1 Months Ended
	Feb. 28, 2017 USD ($)
Commercial and Other Litigation
Loss Contingencies [Line Items]
Litigation settlement amount to other party	$ 80

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LitigationCaseAxis=mrk_CommercialandOtherLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: