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Share-Based Compensation - Summary of SARs Exercised (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Total intrinsic value of SARs exercised	$ 31	$ 25	$ 126
Total fair value of SARs vested	$ 30	$ 31	$ 34

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- Definition

The total fair value of stock appreciation rights that have vested during the fiscal year period.

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No definition available.

+ Details

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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.

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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