Debt and Financing Arrangements - Schedule of Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 48	$ 49	$ 142	$ 138
Banking fees and debt issuance cost amortization	4	5	13	16
Interest income	(6)	(6)	(21)	(15)
Premium paid on repurchase of debt	0	0	0	7
Net foreign exchange	2	1	5	3
Net financing charges	$ 48	$ 49	$ 139	$ 149