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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Numerator for basic and diluted EPS - Income (loss) from continuing operations		$ 50	$ 23	$ (491)	$ (3)
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		60	61	61	63
Share based awards convertible to common shares	[1]	1	1	0	0
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		61	62	61	63
PER SHARE DATA
Basic		$ 0.82	$ 0.38	$ (8.11)	$ (0.05)
Diluted		$ 0.81	$ 0.37	$ (8.11)	$ (0.05)
[1] As a result of the loss from continuing operations attributable to Ashland during the nine months ended June 30, 2020 and 2019, the effect of the share-based awards convertible to common shares would be antidilutive and have been excluded from the diluted EPS calculation.

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