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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		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Numerator
Numerator for basic and diluted EPS - Income (loss) from continuing operations, net of tax		$ 30	$ 121	$ (136)	$ 149
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding		47	50	47	50
Share based awards convertible to common shares		0	1	0	1
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		47	51	47	51
Earnings Per Share from Continuing Operations [Abstract]
Basic		$ 0.63	$ 2.43	$ (2.91)	$ 2.95
Diluted	[1]	$ 0.63	$ 2.4	$ (2.91)	$ 2.92
[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.

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