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EMPLOYEE STOCK BENEFIT PLANS (Outstanding and Exercisable Options) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding 15,577us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Options Outstanding, Weighted Average Remaining Contractual Life 2 years 7 months 29 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 22.29us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Options Outstanding, Aggregate Intrinsic Value $ 572us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options Exercisable, Number Exercisable 15,577us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Options Exercisable, Weighted Average Remaining Contractual Life 2 years 7 months 29 days
Options Exercisable, Weighted Average Exercise Price Per Share $ 22.29us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Options Exercisable, Aggregate Intrinsic Value 572us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Closing Company stock price used to calculate the aggregate intrinsic value $ 59.03bmy_ShareBasedCompensationArrangementIntrinsicValueCalculationClosingStockPrice
Exercise Price Of One Dollar To Twenty Dollars [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding 4,886us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 1 month 31 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 17.53us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Options Outstanding, Aggregate Intrinsic Value 203us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Options Exercisable, Number Exercisable 4,886us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Options Exercisable, Weighted Average Remaining Contractual Life 4 years 1 month 31 days
Options Exercisable, Weighted Average Exercise Price Per Share $ 17.53us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Options Exercisable, Aggregate Intrinsic Value 203us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfOneDollarToTwentyDollarsMember
Exercise Price Of Twenty Dollars To Thirty Dollars [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number Outstanding 10,691us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember
Options Outstanding, Weighted Average Remaining Contractual Life 1 year 11 months 20 days
Options Outstanding, Weighted Average Exercise Price Per Share $ 24.46us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember
Options Outstanding, Aggregate Intrinsic Value 369us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember
Options Exercisable, Number Exercisable 10,691us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember
Options Exercisable, Weighted Average Remaining Contractual Life 1 year 11 months 20 days
Options Exercisable, Weighted Average Exercise Price Per Share $ 24.46us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember
Options Exercisable, Aggregate Intrinsic Value $ 369us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bmy_ExercisePriceOfTwentyDollarsToThirtyDollarsMember