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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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