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Segment Data - Financial Information for Company's Segments (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]      
Workforce reduction charge $ 36bdx_WorkforceReductionCosts $ 36bdx_WorkforceReductionCosts  
Antitrust and False Advertising Lawsuit [Member]      
Segment Reporting Information [Line Items]      
Name of plaintiff   Retractable Technologies, Inc. (“RTI”)  
Medical [Member]      
Segment Reporting Information [Line Items]      
Workforce reduction charge   21bdx_WorkforceReductionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_MedicalMember
 
Charge associated with the decision to terminate a research and development program   6us-gaap_BusinessExitCosts1
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_MedicalMember
 
Acquisition-related costs   4us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_MedicalMember
 
Life Sciences [Member]      
Segment Reporting Information [Line Items]      
Charge from discontinuance   20us-gaap_CapitalizedComputerSoftwareImpairments
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_LifeSciencesMember
 
Workforce reduction charge   10bdx_WorkforceReductionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_LifeSciencesMember
 
Charge resulted from termination   11bdx_BusinessExitCostsOneContractTermination
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_LifeSciencesMember
 
Charge due to adjustment to carrying amount of an asset held for sale   5us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_LifeSciencesMember
 
Acquisition-related costs   1us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= bdx_LifeSciencesMember
 
Corporate and All Other [Member]      
Segment Reporting Information [Line Items]      
Workforce reduction charge   5bdx_WorkforceReductionCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
 
Gain on sale of small equity ownership interest   8us-gaap_GainLossOnInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
 
Pretax charge relating to an unfavorable litigation verdict     341.0us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Settlement amount     $ 22us-gaap_LitigationSettlementAmount
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember