Debt and Financing Arrangements - Schedule of Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 46	$ 48	$ 94	$ 89
Banking fees and debt issuance cost amortization	5	7	9	11
Interest income	(6)	(5)	(15)	(9)
Premium paid on repurchase of debt	0	7	0	7
Net foreign exchange	2	2	3	2
Net financing charges	$ 47	$ 59	$ 91	$ 100