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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Restricted Investments, Current		$ 24	$ 30
Purchases of investment securities		348	26	$ 19
Sales of investment securities		348	26	19
Restricted Investment [Abstract]
Unrealized gains on equity securities	[1]	7	18	25
Deferred income taxes		20	(100)	$ (26)
Other financial instruments [Abstract]
Long-term Debt, Carrying Value		1,513	2,307
Long-term Debt, Fair Value		$ 1,680	2,372
Accounting Standards Update 2016-01 | Reclassified from AOCI to Retained Earnings [Member]
Restricted Investment [Abstract]
Unrealized gains on equity securities			54
Deferred income taxes			$ 20
[1] Ashland determined that all unrealized gains and losses were related to equity securities with readily determinable fair values. Due to the new accounting guidance adopted in the first quarter of fiscal year 2019, the net unrealized losses during the year ended September 30, 2019 were recorded within the net interest and other expense (income) caption in the Statements of Consolidated Income (Loss). In 2018 and 2017 these net unrealized gains (losses) were in AOCI.

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