ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Schedule of Assets Acquired and Liabilities Assumed in Karuna Acquisition (Details) - USD ($) $ in Millions		3 Months Ended
Mar. 18, 2024	Mar. 31, 2024
Asset Acquisition, Contingent Consideration [Line Items]
Deferred income tax asset	$ 542
IPRD
Asset Acquisition, Contingent Consideration [Line Items]
Other intangible assets	12,122
Karuna
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	(14,027)
Transaction costs	55
Total consideration allocated	13,793
Cash and cash equivalents	1,167
Other assets	67
Other intangible assets	100
Deferred income tax liability	(25)
Other liabilities	(180)
Total identifiable assets acquired, net	1,671
Common Stock \| Karuna
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	(12,606)
Equity \| Karuna
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	(1,421)
Unvested Equity Awards \| Karuna
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	$ (289)
Unvested Equity Awards \| Karuna \| Equity Securities
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions		$ (130)
Unvested Equity Awards \| Karuna \| Research and development
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions		$ (159)

Asset Acquisition, Assets Acquired and Liabilities Assumed, Net

No definition available.

Name:	bmy_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Asset Acquisition, Assets, Other

+ References

No definition available.

+ Details

Name:	bmy_AssetAcquisitionAssetsOther
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Asset Acquisition, Cash and Equivalents

+ References

No definition available.

+ Details

Name:	bmy_AssetAcquisitionCashAndEquivalents
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Asset Acquisition, Deferred Income Tax Asset

+ References

No definition available.

+ Details

Name:	bmy_AssetAcquisitionDeferredIncomeTaxAsset
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Asset Acquisition, Deferred Income Tax Liability

+ References

No definition available.

+ Details

Name:	bmy_AssetAcquisitionDeferredIncomeTaxLiability
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Asset Acquisition, Liabilities, Other

+ References

No definition available.

+ Details

Name:	bmy_AssetAcquisitionLiabilitiesOther
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments For Asset Acquisitions

+ References

No definition available.

+ Details

Name:	bmy_PaymentsForAssetAcquisitions
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 55
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479908/805-50-55-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480060/805-50-25-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-2

+ Details

Name:	us-gaap_AssetAcquisitionConsiderationTransferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of transaction cost incurred as part of consideration transferred in asset acquisition.

+ References

+ Details

Name:	us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 15
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480123/805-50-15-3

+ Details

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

- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InProcessResearchAndDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetAcquisitionAxis=bmy_KarunaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=bmy_UnvestedEquityAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: