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Debt - Interest Expense, net (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Debt Disclosure [Abstract]
Interest expense, net	$ 162	$ 161	$ 141
Interest expense, debt	$ 177	$ 182	$ 157
Weighted-average interest rate of total debt	4.10%	4.30%	4.10%

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of interest income (expense) classified as nonoperating.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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