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Debt - Interest Expense, net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt Disclosure [Abstract]
Interest expense, net	$ 161	$ 141	$ 125
Interest expense, debt	$ 182	$ 157	$ 125
Long-term debt, weighted average interest rate, at point in time	4.30%	4.10%	3.50%

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- Definition

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

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-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Amount of interest income (expense) classified as nonoperating.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03)
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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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