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Debt - Interest Expense, net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Interest expense, net	$ 125	$ 122	$ 127
Long-term debt, weighted average interest rate, at point in time	3.50%	3.20%	3.70%

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- Definition

The net amount of nonoperating interest income (expense).

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- Definition

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

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