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Debt - Schedule of Senior Unsecured Note Issued (Detail) (USD $)
Mar. 31, 2015
Sep. 30, 2014
Apr. 30, 2015
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 12,128,000,000us-gaap_LongTermDebtNoncurrent $ 3,768,000,000us-gaap_LongTermDebtNoncurrent  
CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 6,200,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember		    
Floating Rate Notes due June 15, 2016 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 750,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandSixteenMember		    
1.800% Notes due December 15, 2017 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 1,250,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandSeventeenMember		    
2.675% Notes due December 15, 2019 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 1,250,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandNineteenMember		    
3.734% Notes due December 15, 2024 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 1,750,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandTwentyFourMember		    
4.685% Notes due December 15, 2044 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount 1,200,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandFortyFourMember		    
Subsequent Event [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     1,949,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | 1.450% Senior Notes due May 15, 2017 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     293,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandSeventeenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes     97.64%bdx_PrincipalPercentageValidlyTendered
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandSeventeenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | 6.375% Senior Notes due August 1, 2019 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     665,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueAugustTwoThousandNineteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes     95.00%bdx_PrincipalPercentageValidlyTendered
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueAugustTwoThousandNineteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | 3.300% Senior Notes due March 1, 2023 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     294,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandTwentyThreeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes     97.95%bdx_PrincipalPercentageValidlyTendered
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueTwoThousandTwentyThreeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | 3.875% Senior Notes due May 15, 2024 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     397,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandTwentyFourMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes     99.37%bdx_PrincipalPercentageValidlyTendered
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandTwentyFourMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | 4.875% Senior Notes due May 15, 2044 [Member] | CareFusion [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount     $ 300,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandFortyFourMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes     99.96%bdx_PrincipalPercentageValidlyTendered
/ us-gaap_BusinessAcquisitionAxis
= bdx_CareFusionCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= bdx_NotesDueMayTwoThousandFortyFourMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember