This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
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+ Details

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

- Definition

Amount of inventory acquired in business combination and recognized at acquisition date, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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

- Definition

Amount classified as inventory attributable to disposal group, expected to be disposed of within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Paragraph 10
-SubTopic 20
-Topic 205
-Publisher FASB
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-11

+ Details

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

- 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

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ogn_JadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ogn_DermavantSciencesLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Inventories - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Inventories - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Jan. 31, 2026
Disposal Group, Not Discontinued Operations \| Jada
Inventory [Line Items]
Inventory	$ 8		$ 8
Dermavant Sciences Ltd
Inventory [Line Items]
Inventories		$ 97
Adjustment of fair value included in inventory	$ 7	$ 63