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Other Operating Income (Expense), Net and Other Non-Operating Income (Expense), Net - Schedule of Other Non-Operating Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Component of Operating Income [Abstract]
Gains (losses) on foreign currency contracts, net	$ (4)	$ (19)	$ (23)
Amortization of excluded components of certain net investment hedges	2	5	7
Pension and other postretirement plans non-service income, net	7	6	9
Total other non-operating income (expense), net	$ 5	$ (8)	$ (7)

X

- Definition

Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

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