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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator
Numerator for basic and diluted EPS -Income (loss) from continuing operations		$ 36	$ (16)	$ 95	$ (53)
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		63	62	63	62
Share based awards convertible to common shares	[1]	1	0	1	0
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		64	62	64	62
PER SHARE DATA
Basic (in dollars per share)		$ 0.57	$ (0.26)	$ 1.51	$ (0.85)
Diluted (in dollars per share)		$ 0.56	$ (0.26)	$ 1.49	$ (0.85)
[1] As a result of the loss from continuing operations attributable to Ashland during the three and nine months ended June 30, 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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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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