XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.25.2

Inventories - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Inventories classified in other assets | $ 4,882 | $ 4,193
Inventories Not Expected to be Sold Within One Year |  |
Inventory [Line Items] |  |
Inventories classified in other assets | 4,300 | 3,800
Inventories Produced in Preparation for Product Launches |  |
Inventory [Line Items] |  |
Inventories classified in other assets | $ 572 | $ 412

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

X
- Definition Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_InventoryNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=mrk_InventoryNotExpectedtobeSoldWithinOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=mrk_InventoriesProducedinPreparationforProductLaunchesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |