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Litigation, Claims and Contingencies - Summary of Reconciliation of Changes in Environmental Remediation Reserves (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Loss Contingencies [Line Items]
Environmental remediation reserves - beginning of year	$ 226	$ 221
Disbursements	(18)	(17)
Revised obligation estimates and accretion	11	3
Environmental remediation reserves - end of period	$ 219	$ 207

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

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