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Debt and Other Financing Activities - Foreign Accounts Receivable Sales Program -Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Foreign Accounts Receivable Sales Program [Member]
Debt Instrument [Line Items]
Gross cash proceeds received for accounts receivable transferred			$ 242	$ 122
Cash proceeds collected			233	0
Increase (decrease) in account receivable sales volume			9	122
Ashland [Member]
Debt Instrument [Line Items]
Loss on sale of receivables	$ 1	$ 1	2	$ 2
Sales against the buyers limit			117		$ 104
Maximum limit of receivables can transfer			117		104
Amount transferred in accounts receivable			152		155
Ashland [Member] | Maximum [Member]
Debt Instrument [Line Items]
Recorded liabilities related to service obligations and limited guarantee	$ 1		$ 1		$ 1

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