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Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Numerator
Numerator for basic and diluted EPS - Income (loss) from continuing operations, net of tax		$ 15	$ 30	$ 1	$ (136)
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		46	47	46	47
Share based awards convertible to common shares	[1]	0	0	0	0
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		46	47	46	47
EPS from continuing operations
Basic		$ 0.32	$ 0.63	$ 0.02	$ (2.91)
Diluted	[1]	$ 0.32	$ 0.63	$ 0.02	$ (2.91)
[1] As a result of the loss from continuing operations attributable to Ashland during the six months ended March 31, 2025, the effect of the share-based awards convertible to common stock would be antidilutive and have been excluded from the diluted EPS calculation. Convertible shares for each of the applicable periods was less than $1 million.

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