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

Amount of amortization expense attributable to debt issuance costs.

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Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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The net amount of operating interest income (expense).

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Amount of interest income earned from interest bearing assets classified as other.

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