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Significant Accounting Policies - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Numerator
Income (loss) from continuing operations attributable to Ashland, net of tax		$ 24	$ 19	$ (180)
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		62	63	62
Share based awards convertible to common shares	[1]	1	1	0
Denominator for diluted EPS - Adjusted weighted - average shares and assumed conversions		63	64	62
EPS from continuing operations
Income (loss) from continuing operations		$ 0.39	$ 0.30	$ (2.90)
Income (loss) from continuing operations		$ 0.39	$ 0.29	$ (2.90)
[1] As a result of the loss from continuing operations for 2017, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, they have been excluded from the diluted EPS calculation.

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