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PENSION AND POSTRETIREMENT BENEFIT PLANS (Estimated Future Benefit Payments) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]      
Pension contributions $ 124,000,000us-gaap_PensionContributions $ 251,000,000us-gaap_PensionContributions $ 396,000,000us-gaap_PensionContributions
Expected future benefit payments, Years 2020-2024 1,700,000,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter    
Defined contribution plan expense 190,000,000us-gaap_DefinedContributionPlanCostRecognized 190,000,000us-gaap_DefinedContributionPlanCostRecognized 190,000,000us-gaap_DefinedContributionPlanCostRecognized
Minimum [Member]      
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]      
Expected future benefit payments range 300,000,000bmy_Definedbenefitplanexpectedfuturebenefitpaymentsrange
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]      
Expected future benefit payments range 400,000,000bmy_Definedbenefitplanexpectedfuturebenefitpaymentsrange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Pension Plans, Defined Benefit [Member]      
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]      
Expected contributions to pension plans $ 100,000,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember