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INCOME TAXES (Effective Tax Rate Reconciliation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]      
U.S. Earnings/(Loss) before income taxes $ (349,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (135,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (271,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Non-U.S. Earnings before income taxes 2,730,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 3,026,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 2,611,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Earnings Before Income Taxes 2,381,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 2,891,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 2,340,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
U.S. statutory rate, Amount 833,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 1,012,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 819,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign tax effect of certain operations in Ireland, Puerto Rico and Switzerland (509,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (620,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (688,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
U.S. tax effect of capital losses, Amount (361,000,000)us-gaap_IncomeTaxReconciliationDeductionsOther   (392,000,000)us-gaap_IncomeTaxReconciliationDeductionsOther
U.S. Federal, state and foreign contingent tax matters, Amount 228,000,000us-gaap_IncomeTaxReconciliationTaxContingencies 134,000,000us-gaap_IncomeTaxReconciliationTaxContingencies 66,000,000us-gaap_IncomeTaxReconciliationTaxContingencies
U.S. Federal research based credits, amount (131,000,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (220,000,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (31,000,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Non-tax deductible goodwill related to diabetes divestiture, Amount 210,000,000us-gaap_IncomeTaxReconciliationDispositionOfBusiness    
Non-tax deductible U.S. Branded Prescription Drug fee, Amount 84,000,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 63,000,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 90,000,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Non-tax deductible research and development charge, Amount 52,000,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment    
State and local taxes (net of valuation allowance), Amount 20,000,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 25,000,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 20,000,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign and other, Amount (74,000,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (83,000,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (45,000,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision for/(Benefit from) Income Taxes 352,000,000us-gaap_IncomeTaxExpenseBenefit 311,000,000us-gaap_IncomeTaxExpenseBenefit (161,000,000)us-gaap_IncomeTaxExpenseBenefit
Undistributed Earnings of Foreign Subsidiaries 24,000,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Transfer pricing reserves 123,000,000bmy_Transferpricingreserves    
Retroactive reinstatement of the 2012 research and development tax credit recognized in 2013   $ 82,000,000bmy_IncomeTaxReconciliationTaxCreditsResearchRetroactiveReinstatement  
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign tax effect of certain operations in Ireland, Puerto Rico and Switzerland, Rate (21.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (21.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (29.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
U.S. tax effect of capital losses, Rate (15.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther   (16.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
U.S. Federal, state and foreign contingent tax matters, Rate 9.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 4.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
U.S. Federal research based credits, Rate (5.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (7.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Non-tax deductible goodwill related to diabetes divestiture, Rate 8.80%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness    
Non-tax deductible U.S. Branded Prescription Drug Fee, Rate 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Non-tax deductible research and development charge, Rate 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment    
State and local taxes (net of valuation allowance), Rate 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign and other, Rate (3.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax/(benefit) rate 14.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 10.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (6.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations