Name:	bmy_DecreaseInDefinedBenefitLiabilitiesAttributedToActuarialGainsandHigherThanExpectedReturns
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the decrease in pension and postretirement liabilities as a result of actuarial gains attributed to the benefit obligation during the period.

No definition available.

Name:	bmy_DecreaseInDefinedBenefitLiabilityDueToActuarialGains
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the decrease in pension and postretirement liabilities as a result of higher than expected returns on plan assets duing the period.

No definition available.

Name:	bmy_DecreaseInDefinedBenefitLiabilityHigherThanExpectedReturnOnPlanAssets
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount by which the fair value of defined benefit plan assets exceeded market-related value as of the balance sheet date. The market-related value is a calculated value of assets used in determining the expected return on defined benefit plan assets.

No definition available.

Name:	bmy_DefinedBenefitMarketRelatedValueOfPlanAssetsExceedsFairValue
Namespace Prefix:	bmy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the historical long-term actual annualized returns for United States defined benefit pension plans for fifteen years expressed as a percentage.

No definition available.

Name:	bmy_HistoricalLongTermActualAnnualizedReturnsFifteenYearsPercentage
Namespace Prefix:	bmy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This element represents the historical long-term actual annualized returns for United States defined benefit pension plans for ten years expressed as a percentage.

No definition available.

Name:	bmy_HistoricalLongTermActualAnnualizedReturnsTenYearsPercentage
Namespace Prefix:	bmy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This element represents the historical long-term actual annualized returns for United States defined benefit pension plans for twenty years expressed as a percentage.

No definition available.

Name:	bmy_HistoricalLongTermActualAnnualizedReturnsTwentyYearsPercentage
Namespace Prefix:	bmy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This element represents the percentage of the greater of the market-related value of plan assets or projected benefit obligation not amortized from accumulated other comprehensive income into earnings.

No definition available.

Name:	bmy_PercentageOfPlanAssetsOrPlanObligationNotAmortizedFromOtherComprehensiveIncome
Namespace Prefix:	bmy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The interest rate used to adjust for the time value of money for the plan.

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Expected rate of compensation increases (for pay-related plans).

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The interest rate used to adjust for the time value of money.

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Expected rate of compensation increases (for pay-related plans).

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

Name:	us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The ultimate trend rate for health care costs.