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Contingencies Contingencies - Commercial and Other Litigation - Narrative (Details) $ in Millions | 1 Months Ended
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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: |