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Share-Based Compensation - Summary of SARs Exercised (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-Based Payment Arrangement [Abstract] |  |  |
Total intrinsic value of SARs exercised | $ 126 | $ 184 | $ 102
Total fair value of SARs vested | $ 34 | $ 36 | $ 39

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- Definition The total fair value of stock appreciation rights that have vested during the fiscal year period. + References No definition available. + Details
Name: | bdx_FairValueOfStockAppreciationRights
Namespace Prefix: | bdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on stock appreciation rights which were exercised during the reporting period under the plan. + References No definition available. + Details
Name: | bdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockAppreciationRightsExercisesInPeriodIntrinsicValue
Namespace Prefix: | bdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration