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RESTRUCTURING (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Employee termination benefits $ 10us-gaap_SeveranceCosts1 $ 20us-gaap_SeveranceCosts1  
Other exit costs 2us-gaap_OtherRestructuringCosts 1us-gaap_OtherRestructuringCosts  
Provision for restructuring 12us-gaap_RestructuringCharges 21us-gaap_RestructuringCharges  
Workforce reduction of manufacturing, selling, administrative, and research and development personnel 245us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated 180us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated  
Restructuring expected cost     100us-gaap_RestructuringAndRelatedCostExpectedCost
Liability at January 1 156us-gaap_RestructuringReserve 102us-gaap_RestructuringReserve 156us-gaap_RestructuringReserve
Charges 12bmy_RestructuringReservePeriodExpense1 23bmy_RestructuringReservePeriodExpense1  
Change in estimates   (2)us-gaap_RestructuringReserveAccrualAdjustment  
Foreign currency translation (11)us-gaap_RestructuringReserveTranslationAdjustment 1us-gaap_RestructuringReserveTranslationAdjustment  
Payments (45)us-gaap_PaymentsForRestructuring (27)us-gaap_PaymentsForRestructuring  
Liability at March 31 $ 112us-gaap_RestructuringReserve $ 97us-gaap_RestructuringReserve