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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment $ 9,066us-gaap_PropertyPlantAndEquipmentGross $ 8,843us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation (4,649)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (4,264)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and Equipment 4,417us-gaap_PropertyPlantAndEquipmentNet 4,579us-gaap_PropertyPlantAndEquipmentNet  
Property Plant And Equipment Manufacturing Facility Expected To Be Sold 235bmy_PropertyPlantAndEquipmentManufacturingFacilityExpectedToBeSold    
Depreciation expense 543us-gaap_Depreciation 453us-gaap_Depreciation 382us-gaap_Depreciation
Land [Member]      
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 109us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
109us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 4,830us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
4,748us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Machinery equipment and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 3,774us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
3,699us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment $ 353us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 287us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember