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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, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Foreign Accounts Receivable Sales Program [Member]
Debt Instrument [Line Items]
Gross cash proceeds received for accounts receivable transferred			$ 52	$ 242
Cash proceeds collected			45	233
Increase (decrease) in account receivable sales volume			7	9
Ashland [Member]
Debt Instrument [Line Items]
Loss on sale of receivables		$ 1	1	$ 2
Receivables sold under agreement			104		$ 103
Amount transferred in accounts receivable			147		142
Ashland [Member] | Maximum [Member]
Debt Instrument [Line Items]
Loss on sale of receivables	$ 1
Recorded liabilities related to service obligations and limited guarantee	$ 1		$ 1		$ 1

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