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ALLIANCES - Financial Information Pertaining to Alliances (SystImmune) (Details) - SystImmune - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Alliance Statement [Line Items] |  |
Upfront payments made to collaborative partner |  | $ 800
Consideration for contingent development and regulatory approval | $ 7,600 |

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- Definition This element represents that additional aggregate consideration for contingent development and regulatory approval milestone payments. + References No definition available. + Details
Name: | bmy_ConsiderationForContingentDevelopmentAndRegulatoryApproval
Namespace Prefix: | bmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Upfront payments made to partner as part of collaborative arrangement. + References No definition available. + Details
Name: | bmy_UpfrontPaymentsMadeToCollaborativePartner
Namespace Prefix: | bmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | bmy_AlliancesAndCollaborationCompaniesAxis=bmy_SystImmuneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |