BusinessAcquisitionPercentageOfVotingInterestsPreviouslyAcquired

No definition available.

Name:	bdx_BusinessAcquisitionPercentageOfVotingInterestsPreviouslyAcquired
Namespace Prefix:	bdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash to be paid/paid, per share acquired, to acquiree's shareholders.

+ References

No definition available.

+ Details

Name:	bdx_BusinessCombinationCashConsiderationTransferredPerShare
Namespace Prefix:	bdx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share amount of total transaction consideration expected to be paid.

+ References

No definition available.

+ Details

Name:	bdx_BusinessCombinationConsiderationTransferredPerShare
Namespace Prefix:	bdx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of acquirer's shares to be received/received by acquiree's shareholders per each share of acquiree.

+ References

No definition available.

+ Details

Name:	bdx_BusinessCombinationEquityInterestIssuedOrIssuableNumberOfSecuritiesCalledByEachShare
Namespace Prefix:	bdx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percent Ownership Owned By Shareholders of Acquiree Subsequent to Acquisition.

+ References

No definition available.

+ Details

Name:	bdx_PercentOwnershipOwnedByShareholdersofAcquireeSubsequenttoAcquisition
Namespace Prefix:	bdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bdx_CRBardIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bdx_CareFusionCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bdx_CMEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Apr. 23, 2017	Mar. 17, 2015	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Apr. 03, 2017
Business Acquisition [Line Items]
Proceeds from issuance of equity securities			$ 4,800	$ 4,827	$ 0	$ 0
CR Bard Inc [Member]
Business Acquisition [Line Items]
Business Combination Consideration Transferred Per Share	$ 317.00
Business Combination, Consideration Transferred	$ 24,000
Cash consideration per share (USD per share)	$ 222.93
Business Combination Equity Interest Issued or Issuable Number of Securities Called by Each Share	0.5077
Percent Ownership Owned By Shareholders of Acquiree Subsequent to Acquisition	15.00%
Proceeds from Issuance of Debt			$ 9,600
Noncash consideration-fair value of shares issued	$ 8,000
Care Fusion Corporation
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 12,538
Noncash consideration-fair value of shares issued		$ 2,269
Percentage of interest acquired		100.00%
Business combination, pro forma information, revenue of acquiree since acquisition date,						2,000
Business combination, pro forma information, loss of acquiree since acquisition date						$ 242
CME [Member]
Business Acquisition [Line Items]
BusinessAcquisitionPercentageOfVotingInterestsPreviouslyAcquired							40.00%
Percentage of interest acquired							60.00%