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Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Numerator for basic and diluted EPS - Income (loss) from continuing operations		$ 23	$ 11	$ (3)	$ 21
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		61	63	63	63
Share based awards convertible to common shares	[1]	1	1	0	1
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		62	64	63	64
PER SHARE DATA
Basic		$ 0.38	$ 0.18	$ (0.05)	$ 0.33
Diluted		$ 0.37	$ 0.18	$ (0.05)	$ 0.32
[1] As a result of the loss from continuing operations attributable to Ashland during the nine months ended June 30, 2019, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, these shares have been excluded from the diluted EPS calculation.

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