Supplemental Financial Information - Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Equity securities, FV-NI, unrealized gain (loss)	$ 5	$ (3)	$ (35)
Deferred compensation investment income (expense)	57	32	(46)
Net pension cost (credit)	(65)	(98)	(17)
Foreign currency transaction gain (loss), realized	(47)	(36)	(28)
Losses on debt extinguishment	0	0	(24)
Embecta services agreement income, net	26	59	33
Other	(4)	0	1
Other expense, net	$ (28)	(46)	(117)
United States
Pension settlement expense		$ 57	$ 73